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|
// asciinema-server: a minimal asciinema-compatible server in Go.
// All code lives in this single file for now.
package main
import (
"bytes"
"context"
"crypto/md5"
"crypto/rand"
"database/sql"
"embed"
"encoding/base64"
"encoding/json"
"errors"
"flag"
"fmt"
"html/template"
"io"
"log"
"net/http"
"net/url"
"os"
"strconv"
"strings"
"sync"
"time"
"image"
"image/color"
"image/draw"
"image/png"
avt "avt-go"
"avt-go/types"
zstd "github.com/klauspost/stdgozstd"
"golang.org/x/crypto/bcrypt"
"golang.org/x/image/font"
"golang.org/x/image/font/gofont/gomonobold"
"golang.org/x/image/font/opentype"
"golang.org/x/image/math/fixed"
"golang.org/x/net/websocket"
_ "modernc.org/sqlite"
sqlite "zombiezen.com/go/sqlite"
"zombiezen.com/go/sqlite/sqlitex"
)
// ---------------------------------------------------------------------------
// Embedded static assets
// ---------------------------------------------------------------------------
//go:embed static
var staticFiles embed.FS
// gomonoBoldFont is the Go Mono Bold font, used for PNG preview rendering.
var gomonoBoldFont = func() *opentype.Font {
f, err := opentype.Parse(gomonobold.TTF)
if err != nil {
panic(err)
}
return f
}()
var (
staticPlayerCSS = mustReadStatic("static/asciinema-player.css")
staticPlayerJS = mustReadStatic("static/asciinema-player.min.js")
staticLivePlayerJS = mustReadStatic("static/live-player.js")
staticVtJS = mustReadStatic("static/vt_js.js")
staticVtWasm = mustReadStatic("static/vt_js_bg.wasm")
)
func mustReadStatic(path string) []byte {
data, err := staticFiles.ReadFile(path)
if err != nil {
panic(err)
}
return data
}
// ---------------------------------------------------------------------------
// Config
// ---------------------------------------------------------------------------
type Config struct {
DatabasePath string
BaseURL string // full URL e.g. "http://localhost:4000" or "https://example.com"
AppTitle string // displayed in page titles and login page
UploadSizeLimit int64
StreamRetentionDays int // days to keep ended streams (default 7)
}
func loadConfig() Config {
port := getenv("PORT", "4000")
c := Config{
DatabasePath: getenv("DATABASE_PATH", "asciinema.db"),
BaseURL: getenv("BASE_URL", "http://localhost:"+port),
AppTitle: getenv("APP_TITLE", "asciinema"),
UploadSizeLimit: 10 * 1024 * 1024, // 10 MB default
StreamRetentionDays: 7,
}
if lim := os.Getenv("UPLOAD_SIZE_LIMIT"); lim != "" {
if n, err := strconv.ParseInt(lim, 10, 64); err == nil {
c.UploadSizeLimit = n
}
}
if days := os.Getenv("STREAM_RETENTION_DAYS"); days != "" {
if n, err := strconv.Atoi(days); err == nil && n > 0 {
c.StreamRetentionDays = n
}
}
// Strip trailing slash for consistent URL building
c.BaseURL = strings.TrimRight(c.BaseURL, "/")
return c
}
func getenv(key, def string) string {
if v := os.Getenv(key); v != "" {
return v
}
return def
}
// ---------------------------------------------------------------------------
// Database schema & migrations
// ---------------------------------------------------------------------------
const schema = `
CREATE TABLE IF NOT EXISTS users (
id INTEGER PRIMARY KEY AUTOINCREMENT,
email TEXT UNIQUE,
username TEXT UNIQUE,
auth_token TEXT UNIQUE,
inserted_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
password_hash TEXT
);
CREATE TABLE IF NOT EXISTS invites (
token TEXT PRIMARY KEY,
username TEXT NOT NULL UNIQUE,
used_at DATETIME,
inserted_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
);
CREATE TABLE IF NOT EXISTS clis (
id INTEGER PRIMARY KEY AUTOINCREMENT,
user_id INTEGER REFERENCES users(id),
token TEXT NOT NULL UNIQUE,
revoked_at DATETIME,
inserted_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
);
CREATE TABLE IF NOT EXISTS asciicasts (
id INTEGER PRIMARY KEY AUTOINCREMENT,
user_id INTEGER REFERENCES users(id),
cli_id INTEGER REFERENCES clis(id),
version INTEGER NOT NULL DEFAULT 2,
duration REAL NOT NULL DEFAULT 0,
term_cols INTEGER NOT NULL DEFAULT 80,
term_rows INTEGER NOT NULL DEFAULT 24,
term_type TEXT,
term_theme_fg TEXT,
term_theme_bg TEXT,
term_theme_palette TEXT,
command TEXT,
shell TEXT,
user_agent TEXT,
title TEXT,
description TEXT,
secret_token TEXT NOT NULL UNIQUE,
idle_time_limit REAL,
snapshot_at REAL,
archivable INTEGER NOT NULL DEFAULT 1,
archived_at DATETIME,
inserted_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
cast_data BLOB
);
CREATE TABLE IF NOT EXISTS sessions (
token TEXT PRIMARY KEY,
user_id INTEGER NOT NULL REFERENCES users(id),
expires_at DATETIME NOT NULL,
inserted_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
);
`
// Server holds all shared server state.
type Server struct {
cfg Config
db *sql.DB // normal queries
blobConn *sqlite.Conn // zombiezen conn for blob I/O only
blobMu sync.Mutex
hub *StreamHub
}
// sqliteDSN builds the connection string, carrying the pragmas we want applied
// to every connection: WAL, foreign-key enforcement, and a busy_timeout so a
// writer waits for the lock rather than failing outright with SQLITE_BUSY.
//
// These must be _pragma DSN parameters. The modernc driver applies those on
// each connection it opens; the plausible-looking _journal_mode=/_foreign_keys=
// /_busy_timeout= spelling used previously did nothing at all, because the
// driver silently ignores DSN parameters it does not recognise. (This went
// unnoticed because the pool is capped at a single connection below, and the
// foreign_keys pragma was also being set via db.Exec.)
func sqliteDSN(path string) string {
return "file:" + path +
"?_pragma=busy_timeout(5000)&_pragma=journal_mode(WAL)&_pragma=foreign_keys(on)"
}
func openServer(cfg Config) (*Server, error) {
db, err := sql.Open("sqlite", sqliteDSN(cfg.DatabasePath))
if err != nil {
return nil, err
}
db.SetMaxOpenConns(1)
db.Exec(`PRAGMA foreign_keys = ON`)
db.Exec(`PRAGMA secure_delete = ON`)
if _, err := db.Exec(schema); err != nil {
db.Close()
return nil, fmt.Errorf("schema: %w", err)
}
if _, err := db.Exec(streamSchema); err != nil {
db.Close()
return nil, fmt.Errorf("stream schema: %w", err)
}
// Additive migrations — ALTER TABLE errors are ignored if column already exists.
for _, migration := range []string{
`ALTER TABLE users ADD COLUMN theme_dark TEXT NOT NULL DEFAULT 'asciinema'`,
`ALTER TABLE users ADD COLUMN theme_light TEXT NOT NULL DEFAULT 'default-light'`,
} {
db.Exec(migration) // intentionally ignore error (column may already exist)
}
for _, migration := range streamMigrations {
db.Exec(migration) // intentionally ignore error (column may already exist)
}
blobConn, err := sqlite.OpenConn(cfg.DatabasePath, sqlite.OpenReadWrite|sqlite.OpenWAL)
if err != nil {
db.Close()
return nil, fmt.Errorf("blob conn: %w", err)
}
blobConn.SetBusyTimeout(5 * time.Second)
return &Server{cfg: cfg, db: db, blobConn: blobConn, hub: newStreamHub()}, nil
}
func (s *Server) close() {
s.blobConn.Close()
s.db.Close()
}
// ---------------------------------------------------------------------------
// Theme definitions
// ---------------------------------------------------------------------------
type themeInfo struct {
ID string
Label string
Dark bool
Background string // matches --term-color-background in the CSS
Foreground string // matches --term-color-foreground in the CSS
Red string // matches --term-color-1 in the CSS
Green string // matches --term-color-2 in the CSS
Yellow string // matches --term-color-3 in the CSS
Blue string // matches --term-color-4 in the CSS
// Full 16-color ANSI palette: Color[0]=black … Color[15]=bright-white.
// Used when rendering terminal content as a PNG.
Color [16]string
}
var themes = []themeInfo{
{
ID: "asciinema", Label: "asciinema", Dark: true,
Background: "#121314", Foreground: "#cccccc",
Red: "#dd3c69", Green: "#4ebf22", Yellow: "#ddaf3c", Blue: "#26b0d7",
Color: [16]string{
"#121314", "#dd3c69", "#4ebf22", "#ddaf3c", "#26b0d7", "#a347ba", "#26b0d7", "#cccccc",
"#686868", "#ff4f7a", "#70ef42", "#ffd04e", "#56d6ff", "#c76fe0", "#56d6ff", "#ffffff",
},
},
{
ID: "dracula", Label: "Dracula", Dark: true,
Background: "#282a36", Foreground: "#f8f8f2",
Red: "#ff5555", Green: "#50fa7b", Yellow: "#f1fa8c", Blue: "#bd93f9",
Color: [16]string{
"#21222c", "#ff5555", "#50fa7b", "#f1fa8c", "#bd93f9", "#ff79c6", "#8be9fd", "#f8f8f2",
"#6272a4", "#ff6e6e", "#69ff94", "#ffffa5", "#d6acff", "#ff92df", "#a4ffff", "#ffffff",
},
},
{
ID: "monokai", Label: "Monokai", Dark: true,
Background: "#272822", Foreground: "#f8f8f2",
Red: "#f92672", Green: "#a6e22e", Yellow: "#f4bf75", Blue: "#66d9ef",
Color: [16]string{
"#272822", "#f92672", "#a6e22e", "#f4bf75", "#66d9ef", "#ae81ff", "#a1efe4", "#f8f8f2",
"#75715e", "#f92672", "#a6e22e", "#f4bf75", "#66d9ef", "#ae81ff", "#a1efe4", "#f9f8f5",
},
},
{
ID: "gruvbox-dark", Label: "Gruvbox Dark", Dark: true,
Background: "#282828", Foreground: "#fbf1c7",
Red: "#cc241d", Green: "#98971a", Yellow: "#d79921", Blue: "#458588",
Color: [16]string{
"#282828", "#cc241d", "#98971a", "#d79921", "#458588", "#b16286", "#689d6a", "#a89984",
"#928374", "#fb4934", "#b8bb26", "#fabd2f", "#83a598", "#d3869b", "#8ec07c", "#ebdbb2",
},
},
{
ID: "papercolor-light", Label: "PaperColor", Dark: false,
Background: "#eeeeee", Foreground: "#444444",
Red: "#af0000", Green: "#008700", Yellow: "#5f8700", Blue: "#0087af",
Color: [16]string{
"#eeeeee", "#af0000", "#008700", "#5f8700", "#0087af", "#878787", "#005f87", "#444444",
"#bcbcbc", "#d70000", "#d70087", "#8700af", "#d75f00", "#d75f00", "#005faf", "#005f87",
},
},
{
ID: "github-light", Label: "GitHub", Dark: false,
Background: "#f4f4f4", Foreground: "#3e3e3e",
Red: "#970b16", Green: "#07962a", Yellow: "#c18401", Blue: "#003e8a",
Color: [16]string{
"#f4f4f4", "#970b16", "#07962a", "#c18401", "#003e8a", "#8f0075", "#007377", "#3e3e3e",
"#888888", "#de3d35", "#3e9d4f", "#d2b700", "#0451a5", "#bc05bc", "#0598bc", "#ffffff",
},
},
{
ID: "default-light", Label: "Default Light", Dark: false,
Background: "#f8f8f8", Foreground: "#383838",
Red: "#ab4642", Green: "#a1b56c", Yellow: "#f7ca88", Blue: "#7cafc2",
Color: [16]string{
"#181818", "#ab4642", "#a1b56c", "#f7ca88", "#7cafc2", "#ba8baf", "#86c1b9", "#d8d8d8",
"#585858", "#ab4642", "#a1b56c", "#f7ca88", "#7cafc2", "#ba8baf", "#86c1b9", "#f8f8f8",
},
},
{
ID: "gruvbox-light", Label: "Gruvbox Light", Dark: false,
Background: "#fbf1c7", Foreground: "#282828",
Red: "#9d0006", Green: "#79740e", Yellow: "#b57614", Blue: "#076678",
Color: [16]string{
"#fbf1c7", "#9d0006", "#79740e", "#b57614", "#076678", "#8f3f71", "#427b58", "#3c3836",
"#928374", "#cc241d", "#98971a", "#d79921", "#458588", "#b16286", "#689d6a", "#282828",
},
},
}
var darkThemes, lightThemes []themeInfo
var themesByID = func() map[string]themeInfo {
m := make(map[string]themeInfo, len(themes))
for _, t := range themes {
m[t.ID] = t
if t.Dark {
darkThemes = append(darkThemes, t)
} else {
lightThemes = append(lightThemes, t)
}
}
return m
}()
// ---------------------------------------------------------------------------
// Models
// ---------------------------------------------------------------------------
type User struct {
ID int64
Email sql.NullString
Username sql.NullString
AuthToken sql.NullString
PasswordHash sql.NullString
}
type CLI struct {
ID int64
UserID int64
Token string
RevokedAt sql.NullTime
User *User
}
type Asciicast struct {
ID int64
UserID sql.NullInt64
CliID sql.NullInt64
Version int
Duration float64
TermCols int
TermRows int
SecretToken string
Title sql.NullString
Description sql.NullString
Command sql.NullString
Shell sql.NullString
UserAgent sql.NullString
IdleTimeLimit sql.NullFloat64
ArchivedAt sql.NullTime
InsertedAt time.Time
User *User
}
// ---------------------------------------------------------------------------
// DB helpers
// ---------------------------------------------------------------------------
func findCLIByToken(db *sql.DB, token string) (*CLI, error) {
cli := &CLI{}
var userID sql.NullInt64
var userDBID sql.NullInt64
var userEmail, userUsername sql.NullString
err := db.QueryRow(`
SELECT c.id, c.user_id, c.token, c.revoked_at,
u.id, u.email, u.username
FROM clis c
LEFT JOIN users u ON u.id = c.user_id
WHERE c.token = ?
`, token).Scan(
&cli.ID, &userID, &cli.Token, &cli.RevokedAt,
&userDBID, &userEmail, &userUsername,
)
if errors.Is(err, sql.ErrNoRows) {
return nil, nil
}
if err != nil {
return nil, err
}
if userDBID.Valid {
cli.User = &User{
ID: userDBID.Int64,
Email: userEmail,
Username: userUsername,
}
}
cli.UserID = userID.Int64
return cli, nil
}
func insertAsciicast(db *sql.DB, a *Asciicast, castDataSize int) (int64, error) {
res, err := db.Exec(`
INSERT INTO asciicasts
(user_id, cli_id, version, duration, term_cols, term_rows,
secret_token, title, command, shell, user_agent, idle_time_limit,
cast_data)
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, zeroblob(?))
`,
nullInt64(a.UserID), nullInt64(a.CliID),
a.Version, a.Duration, a.TermCols, a.TermRows,
a.SecretToken,
nullString(a.Title), nullString(a.Command), nullString(a.Shell),
nullString(a.UserAgent), nullFloat64(a.IdleTimeLimit),
castDataSize,
)
if err != nil {
return 0, err
}
return res.LastInsertId()
}
const asciicastSelect = `
SELECT a.id, a.user_id, a.cli_id, a.version, a.duration,
a.term_cols, a.term_rows, a.secret_token,
a.title, a.description, a.command, a.shell, a.user_agent,
a.idle_time_limit, a.archived_at, a.inserted_at,
u.id, u.email, u.username
FROM asciicasts a
LEFT JOIN users u ON u.id = a.user_id`
func scanAsciicast(row *sql.Row) (*Asciicast, error) {
a := &Asciicast{}
var userID, userDBID sql.NullInt64
var userEmail, userUsername sql.NullString
err := row.Scan(
&a.ID, &userID, &a.CliID, &a.Version, &a.Duration,
&a.TermCols, &a.TermRows, &a.SecretToken,
&a.Title, &a.Description, &a.Command, &a.Shell, &a.UserAgent,
&a.IdleTimeLimit, &a.ArchivedAt, &a.InsertedAt,
&userDBID, &userEmail, &userUsername,
)
if errors.Is(err, sql.ErrNoRows) {
return nil, nil
}
if err != nil {
return nil, err
}
a.UserID = userID
if userDBID.Valid {
a.User = &User{ID: userDBID.Int64, Email: userEmail, Username: userUsername}
}
return a, nil
}
func getAsciicast(db *sql.DB, id int64) (*Asciicast, error) {
return scanAsciicast(db.QueryRow(asciicastSelect+` WHERE a.id = ?`, id))
}
func getAsciicastBySecretToken(db *sql.DB, token string) (*Asciicast, error) {
return scanAsciicast(db.QueryRow(asciicastSelect+` WHERE a.secret_token = ?`, token))
}
// lookupAsciicast resolves a URL id param by secret token.
func lookupAsciicast(db *sql.DB, idParam string) (*Asciicast, error) {
return getAsciicastBySecretToken(db, strings.TrimSpace(idParam))
}
func deleteAsciicast(db *sql.DB, id int64) error {
_, err := db.Exec(`DELETE FROM asciicasts WHERE id = ?`, id)
return err
}
func updateAsciicast(db *sql.DB, id int64, title, description *string) error {
_, err := db.Exec(`
UPDATE asciicasts
SET title = COALESCE(?, title),
description = COALESCE(?, description),
updated_at = CURRENT_TIMESTAMP
WHERE id = ?
`, title, description, id)
return err
}
// RecordingRow is used for listing a user's recordings.
type RecordingRow struct {
SecretToken string
Title sql.NullString
Duration float64
InsertedAt time.Time
}
func listUserRecordings(db *sql.DB, userID int64) ([]RecordingRow, error) {
rows, err := db.Query(`
SELECT secret_token, title, duration, inserted_at
FROM asciicasts
WHERE user_id = ?
ORDER BY inserted_at DESC
`, userID)
if err != nil {
return nil, err
}
defer rows.Close()
var recs []RecordingRow
for rows.Next() {
var r RecordingRow
if err := rows.Scan(&r.SecretToken, &r.Title, &r.Duration, &r.InsertedAt); err != nil {
return nil, err
}
recs = append(recs, r)
}
return recs, rows.Err()
}
// deleteUserAndEverything deletes a user and all associated data in a
// single transaction. Returns the number of recordings deleted.
func deleteUserAndEverything(db *sql.DB, userID int64) (int64, error) {
tx, err := db.Begin()
if err != nil {
return 0, err
}
defer tx.Rollback()
// Count recordings first
var count int64
tx.QueryRow(`SELECT COUNT(*) FROM asciicasts WHERE user_id = ?`, userID).Scan(&count)
steps := []struct {
q string
args []any
}{
{`DELETE FROM asciicasts WHERE user_id = ?`, []any{userID}},
{`DELETE FROM sessions WHERE user_id = ?`, []any{userID}},
{`DELETE FROM clis WHERE user_id = ?`, []any{userID}},
{`DELETE FROM invites WHERE username = (SELECT username FROM users WHERE id = ?)`, []any{userID}},
{`DELETE FROM users WHERE id = ?`, []any{userID}},
}
for _, s := range steps {
if _, err := tx.Exec(s.q, s.args...); err != nil {
return 0, err
}
}
return count, tx.Commit()
}
// ---------------------------------------------------------------------------
// Invite + user DB helpers
// ---------------------------------------------------------------------------
type Invite struct {
Token string
Username string
UsedAt sql.NullTime
}
func createInvite(db *sql.DB, username, token string) error {
_, err := db.Exec(
`INSERT INTO invites (token, username) VALUES (?, ?)`,
token, username,
)
return err
}
func hasPendingInvite(db *sql.DB, username string) (bool, error) {
var count int
err := db.QueryRow(
`SELECT COUNT(*) FROM invites WHERE username = ? AND used_at IS NULL`, username,
).Scan(&count)
return count > 0, err
}
func getInvite(db *sql.DB, token string) (*Invite, error) {
inv := &Invite{}
err := db.QueryRow(
`SELECT token, username, used_at FROM invites WHERE token = ?`, token,
).Scan(&inv.Token, &inv.Username, &inv.UsedAt)
if errors.Is(err, sql.ErrNoRows) {
return nil, nil
}
return inv, err
}
func useInvite(db *sql.DB, token string) error {
_, err := db.Exec(
`UPDATE invites SET used_at = CURRENT_TIMESTAMP WHERE token = ? AND used_at IS NULL`,
token,
)
return err
}
func createUser(db *sql.DB, username, passwordHash string) (int64, error) {
res, err := db.Exec(
`INSERT INTO users (username, password_hash) VALUES (?, ?)`,
username, passwordHash,
)
if err != nil {
return 0, err
}
return res.LastInsertId()
}
func getUserByUsername(db *sql.DB, username string) (*User, error) {
u := &User{}
err := db.QueryRow(
`SELECT id, username, password_hash FROM users WHERE username = ?`,
username,
).Scan(&u.ID, &u.Username, &u.PasswordHash)
if errors.Is(err, sql.ErrNoRows) {
return nil, nil
}
return u, err
}
func getUserByID(db *sql.DB, id int64) (*User, error) {
u := &User{}
err := db.QueryRow(
`SELECT id, username, password_hash FROM users WHERE id = ?`,
id,
).Scan(&u.ID, &u.Username, &u.PasswordHash)
if errors.Is(err, sql.ErrNoRows) {
return nil, nil
}
return u, err
}
// syncUserTheme saves the authenticated user's current dark/light theme preferences
// to the DB so they can be used to generate embed URLs for Mastodon crawlers,
// which visit the page without cookies.
func syncUserTheme(db *sql.DB, userID int64, darkID, lightID string) {
db.Exec(
`UPDATE users SET theme_dark = ?, theme_light = ? WHERE id = ?`,
darkID, lightID, userID,
)
}
// getOwnerTheme returns the owner's stored dark/light theme IDs for a recording.
// Falls back to server defaults if the user has no stored preferences.
func getOwnerTheme(db *sql.DB, userID sql.NullInt64) (darkID, lightID string) {
darkID, lightID = defaultDarkThemeID, defaultLightThemeID
if !userID.Valid {
return
}
db.QueryRow(
`SELECT theme_dark, theme_light FROM users WHERE id = ?`, userID.Int64,
).Scan(&darkID, &lightID)
// Validate — fall back to defaults if stored values are no longer valid themes.
if themesByID[darkID].ID == "" {
darkID = defaultDarkThemeID
}
if themesByID[lightID].ID == "" {
lightID = defaultLightThemeID
}
return
}
// linkCLIToUser sets user_id on the clis row identified by token, creating it if needed.
func linkCLIToUser(db *sql.DB, installID string, userID int64) error {
_, err := db.Exec(`
INSERT INTO clis (token, user_id)
VALUES (?, ?)
ON CONFLICT(token) DO UPDATE SET user_id = excluded.user_id, updated_at = CURRENT_TIMESTAMP
`, installID, userID)
return err
}
// ---------------------------------------------------------------------------
// Session cookie helpers (DB-backed)
// ---------------------------------------------------------------------------
const sessionCookieName = "asciinema_session"
const sessionTTL = 7 * 24 * time.Hour
func (s *Server) setSessionCookie(w http.ResponseWriter, userID int64) error {
token := randomToken(32)
expires := time.Now().Add(sessionTTL)
_, err := s.db.Exec(
`INSERT INTO sessions (token, user_id, expires_at) VALUES (?, ?, ?)`,
token, userID, expires.UTC().Format("2006-01-02 15:04:05"),
)
if err != nil {
return err
}
http.SetCookie(w, &http.Cookie{
Name: sessionCookieName,
Value: token,
Path: "/",
MaxAge: int(sessionTTL.Seconds()),
HttpOnly: true,
SameSite: http.SameSiteLaxMode,
})
return nil
}
func (s *Server) clearSessionCookie(w http.ResponseWriter, r *http.Request) {
if cookie, err := r.Cookie(sessionCookieName); err == nil {
s.db.Exec(`DELETE FROM sessions WHERE token = ?`, cookie.Value)
}
http.SetCookie(w, &http.Cookie{
Name: sessionCookieName,
Value: "",
Path: "/",
MaxAge: -1,
HttpOnly: true,
})
}
// sessionUser returns the logged-in user from the request cookie, or nil.
func (s *Server) sessionUser(r *http.Request) (*User, error) {
cookie, err := r.Cookie(sessionCookieName)
if err != nil {
return nil, nil
}
var userID int64
err = s.db.QueryRow(
`SELECT user_id FROM sessions WHERE token = ? AND expires_at > CURRENT_TIMESTAMP`,
cookie.Value,
).Scan(&userID)
if errors.Is(err, sql.ErrNoRows) {
return nil, nil
}
if err != nil {
return nil, err
}
return getUserByID(s.db, userID)
}
// ---------------------------------------------------------------------------
// .cast file parsing (v2 / v3)
// ---------------------------------------------------------------------------
type CastMetadata struct {
Version int
Width int
Height int
Title string
Command string
Env map[string]string
IdleTimeLimit float64
Duration float64 // computed from events
}
func parseCastMetadata(r io.Reader) (*CastMetadata, error) {
dec := json.NewDecoder(r)
// First line is the header object
var header map[string]any
if err := dec.Decode(&header); err != nil {
return nil, fmt.Errorf("invalid cast header: %w", err)
}
ver, _ := header["version"].(float64)
if ver != 2 && ver != 3 {
return nil, fmt.Errorf("unsupported cast version: %v", ver)
}
meta := &CastMetadata{
Version: int(ver),
Width: int(jsonFloat(header, "width")),
Height: int(jsonFloat(header, "height")),
Title: jsonString(header, "title"),
Command: jsonString(header, "command"),
}
meta.IdleTimeLimit = jsonFloat(header, "idle_time_limit")
// v3: terminal size may be nested under "term": {"cols": N, "rows": N}
if meta.Width <= 0 || meta.Height <= 0 {
if term, ok := header["term"].(map[string]any); ok {
if meta.Width <= 0 {
meta.Width = int(jsonFloat(term, "cols"))
}
if meta.Height <= 0 {
meta.Height = int(jsonFloat(term, "rows"))
}
}
}
if env, ok := header["env"].(map[string]any); ok {
meta.Env = make(map[string]string, len(env))
for k, v := range env {
if s, ok := v.(string); ok {
meta.Env[k] = s
}
}
}
if meta.Width <= 0 || meta.Height <= 0 {
return nil, fmt.Errorf("invalid terminal size: %dx%d", meta.Width, meta.Height)
}
// Scan remaining lines to find the last timestamp (= duration)
var lastTime float64
for {
var event []any
if err := dec.Decode(&event); err != nil {
if errors.Is(err, io.EOF) {
break
}
// Non-JSON lines (comments in v3) — skip
continue
}
if len(event) >= 1 {
if t, ok := event[0].(float64); ok && t > lastTime {
lastTime = t
}
}
}
meta.Duration = lastTime
return meta, nil
}
func jsonFloat(m map[string]any, key string) float64 {
v, _ := m[key].(float64)
return v
}
func jsonString(m map[string]any, key string) string {
v, _ := m[key].(string)
return v
}
// ---------------------------------------------------------------------------
// zstd helpers (same pattern as hosty)
// ---------------------------------------------------------------------------
var (
zstdDecoder, _ = zstd.NewReader(nil)
zstdEncoder = zstd.NewWriter(nil)
)
// ---------------------------------------------------------------------------
// Auth middleware
// ---------------------------------------------------------------------------
type contextKey int
const ctxCLI contextKey = 1
// basicAuthToken extracts the password from HTTP Basic auth.
// asciinema CLI uses the install-id as the password.
func basicAuthToken(r *http.Request) string {
auth := r.Header.Get("Authorization")
if !strings.HasPrefix(auth, "Basic ") {
return ""
}
decoded, err := base64.StdEncoding.DecodeString(strings.TrimPrefix(auth, "Basic "))
if err != nil {
return ""
}
parts := strings.SplitN(string(decoded), ":", 2)
if len(parts) != 2 {
return ""
}
// The CLI sends the system $USER as the username, but we ignore it —
// the install-id (password) is the actual credential.
return parts[1] // password = install-id / CLI token
}
func (s *Server) requireCLI(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
token := basicAuthToken(r)
if token == "" {
jsonError(w, "Missing credentials", http.StatusUnauthorized)
return
}
cli, err := findCLIByToken(s.db, token)
if err != nil {
jsonError(w, "Internal error", http.StatusInternalServerError)
return
}
if cli == nil {
jsonError(w, "Unregistered CLI", http.StatusUnauthorized)
return
}
if cli.RevokedAt.Valid {
jsonError(w, "Revoked CLI", http.StatusUnauthorized)
return
}
r = r.WithContext(context.WithValue(r.Context(), ctxCLI, cli))
next.ServeHTTP(w, r)
})
}
// ---------------------------------------------------------------------------
// Handlers
// ---------------------------------------------------------------------------
// POST /api/v1/recordings (CLI 3.x)
// POST /api/asciicasts (CLI 2.x legacy)
func (s *Server) handleRecordingCreate() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Get install-id from Basic auth; auto-create anonymous CLI if unknown.
token := basicAuthToken(r)
if token == "" {
jsonError(w, "Missing credentials", http.StatusUnauthorized)
return
}
cli, err := findCLIByToken(s.db, token)
if err != nil {
jsonError(w, "Internal error", http.StatusInternalServerError)
return
}
if cli != nil && cli.RevokedAt.Valid {
jsonError(w, "Revoked CLI", http.StatusUnauthorized)
return
}
// If CLI is not linked to an account, drain the upload and return a
// 201 with a message pointing to the connect URL — the CLI prints it.
if cli == nil || cli.User == nil {
connectURL := s.cfg.BaseURL + "/connect/" + url.PathEscape(token)
r.Body = http.MaxBytesReader(w, r.Body, s.cfg.UploadSizeLimit)
io.Copy(io.Discard, r.Body)
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusCreated)
json.NewEncoder(w).Encode(map[string]string{
"url": connectURL,
"message": "This CLI is not linked to any account.\n\n" +
"Register or log in at:\n\n " + connectURL + "\n\n" +
"Then upload your recording again.",
})
return
}
r.Body = http.MaxBytesReader(w, r.Body, s.cfg.UploadSizeLimit)
if err := r.ParseMultipartForm(32 << 20); err != nil {
jsonError(w, "Invalid multipart form", http.StatusBadRequest)
return
}
// Accept field name "asciicast" (CLI 3.x) or "file" (CLI 2.x)
var uploadFile io.ReadCloser
for _, field := range []string{"asciicast", "file"} {
f, _, err := r.FormFile(field)
if err == nil {
uploadFile = f
break
}
}
if uploadFile == nil {
jsonError(w, "Missing file field", http.StatusBadRequest)
return
}
defer uploadFile.Close()
// Read entire upload into RAM — cast files are typically small
raw, err := io.ReadAll(uploadFile)
if err != nil {
jsonError(w, "Upload failed", http.StatusInternalServerError)
return
}
// Parse metadata from the raw bytes
meta, err := parseCastMetadata(bytes.NewReader(raw))
if err != nil {
jsonError(w, "Invalid cast file: "+err.Error(), http.StatusUnprocessableEntity)
return
}
// Compress with zstd
compressed := zstdEncoder.AppendCompress(nil, raw)
secretToken := randomToken(16)
a := &Asciicast{
UserID: sql.NullInt64{Int64: cli.User.ID, Valid: true},
CliID: sql.NullInt64{Int64: cli.ID, Valid: true},
Version: meta.Version,
Duration: meta.Duration,
TermCols: meta.Width,
TermRows: meta.Height,
SecretToken: secretToken,
UserAgent: sql.NullString{String: r.UserAgent(), Valid: true},
}
if meta.Title != "" {
a.Title = sql.NullString{String: meta.Title, Valid: true}
}
if meta.Command != "" {
a.Command = sql.NullString{String: meta.Command, Valid: true}
}
if meta.Env["SHELL"] != "" {
a.Shell = sql.NullString{String: meta.Env["SHELL"], Valid: true}
}
if meta.IdleTimeLimit > 0 {
a.IdleTimeLimit = sql.NullFloat64{Float64: meta.IdleTimeLimit, Valid: true}
}
// Insert row with zeroblob placeholder, then write blob
id, err := insertAsciicast(s.db, a, len(compressed))
if err != nil {
jsonError(w, "DB error: "+err.Error(), http.StatusInternalServerError)
return
}
// Write compressed bytes into the blob via zombiezen conn
if err := s.writeCastBlob(id, compressed); err != nil {
_ = deleteAsciicast(s.db, id)
jsonError(w, "Blob write error: "+err.Error(), http.StatusInternalServerError)
return
}
castURL := s.cfg.BaseURL + "/a/" + secretToken
w.Header().Set("Location", castURL)
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusCreated)
json.NewEncoder(w).Encode(map[string]string{"url": castURL})
})
}
// writeCastBlob writes compressed cast data into the cast_data blob for the given asciicast id.
func (s *Server) writeCastBlob(id int64, compressed []byte) error {
s.blobMu.Lock()
defer s.blobMu.Unlock()
blob, err := s.blobConn.OpenBlob("main", "asciicasts", "cast_data", id, true)
if err != nil {
return fmt.Errorf("open blob: %w", err)
}
defer blob.Close()
_, err = blob.Write(compressed)
return err
}
// readCastBlob reads and decompresses the cast_data blob for the given asciicast id.
func (s *Server) readCastBlob(id int64) ([]byte, error) {
s.blobMu.Lock()
defer s.blobMu.Unlock()
var compressed []byte
err := sqlitex.Execute(s.blobConn,
`SELECT cast_data FROM asciicasts WHERE id = ?`,
&sqlitex.ExecOptions{
Args: []any{id},
ResultFunc: func(stmt *sqlite.Stmt) error {
n := stmt.ColumnLen(0)
compressed = make([]byte, n)
stmt.ColumnBytes(0, compressed)
return nil
},
})
if err != nil {
return nil, fmt.Errorf("read blob: %w", err)
}
if compressed == nil {
return nil, fmt.Errorf("cast_data is null for id %d", id)
}
return zstdDecoder.AppendDecompress(nil, compressed)
}
// PATCH /api/v1/recordings/:id
func (s *Server) handleRecordingUpdate() http.Handler {
return s.requireCLI(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
cli := cliFromRequest(r)
id, err := pathID(r)
if err != nil {
jsonError(w, "Invalid id", http.StatusBadRequest)
return
}
a, err := getAsciicast(s.db, id)
if err != nil || a == nil {
jsonError(w, "Not found", http.StatusNotFound)
return
}
if a.UserID.Int64 != cli.User.ID {
jsonError(w, "Forbidden", http.StatusForbidden)
return
}
var params struct {
Title *string `json:"title"`
Description *string `json:"description"`
}
if err := json.NewDecoder(r.Body).Decode(¶ms); err != nil {
_ = r.ParseForm()
if v := r.FormValue("title"); v != "" {
params.Title = &v
}
if v := r.FormValue("description"); v != "" {
params.Description = &v
}
}
if err := updateAsciicast(s.db, id, params.Title, params.Description); err != nil {
jsonError(w, "DB error", http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusOK)
json.NewEncoder(w).Encode(map[string]any{"id": id})
}))
}
// DELETE /api/v1/recordings/:id
func (s *Server) handleRecordingDelete() http.Handler {
return s.requireCLI(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
cli := cliFromRequest(r)
id, err := pathID(r)
if err != nil {
jsonError(w, "Invalid id", http.StatusBadRequest)
return
}
a, err := getAsciicast(s.db, id)
if err != nil || a == nil {
jsonError(w, "Not found", http.StatusNotFound)
return
}
if a.UserID.Int64 != cli.User.ID {
jsonError(w, "Forbidden", http.StatusForbidden)
return
}
if err := deleteAsciicast(s.db, id); err != nil {
jsonError(w, "DB error", http.StatusInternalServerError)
return
}
w.WriteHeader(http.StatusNoContent)
}))
}
// GET /a/:id or GET /a/:id.cast or GET /a/:id.json
func (s *Server) handleRecordingShow() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Extract id from path: strip leading /a/ and any extension
raw := strings.TrimPrefix(r.URL.Path, "/a/")
var ext string
if dot := strings.LastIndexByte(raw, '.'); dot >= 0 {
ext = strings.ToLower(raw[dot:])
raw = raw[:dot]
}
a, err := lookupAsciicast(s.db, raw)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if a == nil {
http.NotFound(w, r)
return
}
if a.ArchivedAt.Valid {
http.Error(w, "Gone", http.StatusGone)
return
}
wantCast := ext == ".cast" || ext == ".json" ||
strings.Contains(r.Header.Get("Accept"), "application/x-asciicast")
if wantCast {
s.serveCastFile(w, r, a)
} else {
user, _ := s.sessionUser(r)
servePlayerPage(w, r, a, user, s.cfg.AppTitle, s.db, s.cfg.BaseURL)
}
})
}
func (s *Server) serveCastFile(w http.ResponseWriter, r *http.Request, a *Asciicast) {
data, err := s.readCastBlob(a.ID)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
etag := fmt.Sprintf(`"%x"`, md5.Sum(data))
w.Header().Set("ETag", etag)
w.Header().Set("Cache-Control", "no-cache")
if r.Header.Get("If-None-Match") == etag {
w.WriteHeader(http.StatusNotModified)
return
}
w.Header().Set("Content-Type", "application/x-asciicast")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Write(data)
}
// sharedCSS is included verbatim in every page's <style> block.
// themeCSS sets the CSS custom properties; commonCSS has rules that every page uses.
const themeCSS = `{{if eq .Mode "auto"}}
:root { --bg: {{.AutoDarkBg}}; --fg: {{.AutoDarkFg}}; --red: {{.AutoDarkRed}}; }
@media (prefers-color-scheme: light) {
:root { --bg: {{.AutoLightBg}}; --fg: {{.AutoLightFg}}; --red: {{.AutoLightRed}}; }
}{{else}}
:root { --bg: {{.ThemeBg}}; --fg: {{.ThemeFg}}; --red: {{.ThemeRed}}; }{{end}}
body { background: var(--bg); color: var(--fg); }
`
const commonCSS = `
body { font-family: sans-serif; }
a { color: inherit; }
label { display: block; margin: .6rem 0 .2rem; }
input { width: 100%; padding: .4rem; box-sizing: border-box; background: var(--bg); color: inherit; border: 1px solid currentColor; border-radius: 3px; }
button { background: var(--bg); border: 1px solid currentColor; color: inherit; padding: .2rem .6rem; cursor: pointer; border-radius: 3px; }
button:hover { background: var(--fg); color: var(--bg); }
.danger { border-color: var(--red); color: var(--red); }
.danger:hover { background: var(--red); color: var(--bg); }
.theme-sel { background: var(--bg); color: var(--fg); border: 1px solid color-mix(in oklab, var(--fg) 40%, var(--bg)); border-radius: 3px; padding: .2rem .4rem; cursor: pointer; font-size: .85rem; }
#top-bar { position: fixed; top: .5rem; right: 1rem; }
#theme-bar { display: flex; align-items: center; gap: .5rem; font-size: .85rem; }
#theme-bar label { display: inline; margin: 0; }
#mode-toggle { display: flex; border: 1px solid color-mix(in oklab, var(--fg) 40%, var(--bg)); border-radius: 3px; overflow: hidden; }
#mode-toggle button { border: none; border-radius: 0; padding: .25rem .4rem; opacity: .45; display: flex; align-items: center; }
#mode-toggle button:hover { opacity: .75; background: color-mix(in oklab, var(--fg) 15%, var(--bg)); color: inherit; }
#mode-toggle button.active { opacity: 1; background: color-mix(in oklab, var(--fg) 20%, var(--bg)); }
#mode-toggle button + button { border-left: 1px solid color-mix(in oklab, var(--fg) 40%, var(--bg)); }
`
// themeBar is the HTML+JS for the theme controls, inlined into every template.
// The mode selector is rendered as a three-button icon toggle.
// Pages that recreate on theme change must define onThemeChange(id) globally
// before this snippet runs (see playerTmpl).
const themeBar = `
<div id="theme-bar">
<select id="sel-theme" class="theme-sel"></select>
<div id="mode-toggle" role="group" aria-label="Color mode">
<button type="button" id="mode-light" data-mode="light" title="Light mode">
<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
<circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/>
<line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/>
<line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/>
<line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/>
</svg>
</button>
<button type="button" id="mode-auto" data-mode="auto" title="Auto (follow system)">
<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
<circle cx="12" cy="12" r="10"/>
<path d="M12 2 A10 10 0 0 0 12 22 Z" fill="currentColor" stroke="none"/>
</svg>
</button>
<button type="button" id="mode-dark" data-mode="dark" title="Dark mode">
<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true">
<path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/>
</svg>
</button>
</div>
</div>
<script>
(function() {
var themeBg = {
{{range .DarkThemes}}'{{.ID}}':'{{.Background}}',{{end}}
{{range .LightThemes}}'{{.ID}}':'{{.Background}}',{{end}}
};
var themeFg = {
{{range .DarkThemes}}'{{.ID}}':'{{.Foreground}}',{{end}}
{{range .LightThemes}}'{{.ID}}':'{{.Foreground}}',{{end}}
};
var themeRed = {
{{range .DarkThemes}}'{{.ID}}':'{{.Red}}',{{end}}
{{range .LightThemes}}'{{.ID}}':'{{.Red}}',{{end}}
};
// Full 16-color palette per theme — used by the live canvas player.
var themeColors = {
{{range .DarkThemes}}'{{.ID}}':['{{index .Color 0}}','{{index .Color 1}}','{{index .Color 2}}','{{index .Color 3}}','{{index .Color 4}}','{{index .Color 5}}','{{index .Color 6}}','{{index .Color 7}}','{{index .Color 8}}','{{index .Color 9}}','{{index .Color 10}}','{{index .Color 11}}','{{index .Color 12}}','{{index .Color 13}}','{{index .Color 14}}','{{index .Color 15}}'],{{end}}
{{range .LightThemes}}'{{.ID}}':['{{index .Color 0}}','{{index .Color 1}}','{{index .Color 2}}','{{index .Color 3}}','{{index .Color 4}}','{{index .Color 5}}','{{index .Color 6}}','{{index .Color 7}}','{{index .Color 8}}','{{index .Color 9}}','{{index .Color 10}}','{{index .Color 11}}','{{index .Color 12}}','{{index .Color 13}}','{{index .Color 14}}','{{index .Color 15}}'],{{end}}
};
// Options arrays built from server-rendered data, keyed by polarity.
// We build them as Option objects so they can be freely moved in/out of the DOM.
var optsByPolarity = {
dark: [{{range .DarkThemes}}{id:'{{.ID}}',label:'{{.Label}}',bg:'{{.Background}}',fg:'{{.Foreground}}'},{{end}}],
light: [{{range .LightThemes}}{id:'{{.ID}}',label:'{{.Label}}',bg:'{{.Background}}',fg:'{{.Foreground}}'},{{end}}],
};
var selTheme = document.getElementById('sel-theme');
var modeLight = document.getElementById('mode-light');
var modeAuto = document.getElementById('mode-auto');
var modeDark = document.getElementById('mode-dark');
var root = document.documentElement;
var curMode = '{{.Mode}}';
var darkID = '{{.DarkID}}';
var lightID = '{{.LightID}}';
var CKMAX = '; path=/; max-age=31536000; SameSite=Lax';
var CKDARK = '{{.CookieDark}}';
var CKLIGHT = '{{.CookieLight}}';
var CKMODE = '{{.CookieMode}}';
function osIsDark() {
return window.matchMedia('(prefers-color-scheme: dark)').matches;
}
function setCookie(name, val) {
document.cookie = name + '=' + val + CKMAX;
}
function activePolarityIsDark() {
if (curMode === 'dark') return true;
if (curMode === 'light') return false;
return osIsDark();
}
function activeThemeID() {
return activePolarityIsDark() ? darkID : lightID;
}
// Rebuild the select with only the options matching the active polarity.
function updateOptgroups() {
var polarity = activePolarityIsDark() ? 'dark' : 'light';
var activeID = activeThemeID();
selTheme.innerHTML = '';
optsByPolarity[polarity].forEach(function(t) {
var o = document.createElement('option');
o.value = t.id;
o.textContent = t.label;
o.style.background = t.bg;
o.style.color = t.fg;
if (t.id === activeID) o.selected = true;
selTheme.appendChild(o);
});
}
function updateModeButtons() {
[modeLight, modeAuto, modeDark].forEach(function(btn) {
btn.classList.toggle('active', btn.dataset.mode === curMode);
});
}
function applyTheme(id) {
root.style.setProperty('--bg', themeBg[id]);
root.style.setProperty('--fg', themeFg[id]);
root.style.setProperty('--red', themeRed[id]);
if (typeof onThemeChange === 'function') {
var colors = themeColors[id];
var themeObj = colors ? { fg: themeFg[id], bg: themeBg[id], palette: colors } : null;
onThemeChange(id, themeObj);
}
}
// On select change: always stay in current mode, just update the stored ID.
selTheme.addEventListener('change', function() {
var id = selTheme.value;
if (activePolarityIsDark()) { darkID = id; setCookie(CKDARK, id); }
else { lightID = id; setCookie(CKLIGHT, id); }
applyTheme(id);
});
// Mode button clicks: switch mode, rebuild options, apply.
[modeLight, modeAuto, modeDark].forEach(function(btn) {
btn.addEventListener('click', function() {
curMode = btn.dataset.mode;
setCookie(CKMODE, curMode);
updateOptgroups();
applyTheme(activeThemeID());
updateModeButtons();
});
});
// Initial setup — runs synchronously before first paint.
updateOptgroups();
updateModeButtons();
applyTheme(activeThemeID());
// React to OS preference changes while page is open (auto mode only).
window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function() {
if (curMode === 'auto') {
updateOptgroups();
applyTheme(activeThemeID());
}
});
})();
</script>
`
var playerTmpl = template.Must(template.New("player").Parse(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{{.Title}} — {{.AppTitle}}</title>
<link rel="alternate" type="application/x-asciicast" href="{{.CastURL}}">
<meta property="og:title" content="{{.Title}} — {{.AppTitle}}">
<meta property="og:url" content="{{.RecordingURL}}">
<meta property="og:site_name" content="{{.AppTitle}}">
<meta property="twitter:card" content="player">
<meta property="twitter:player" content="{{.EmbedURL}}">
<meta property="twitter:player:width" content="{{.EmbedWidth}}">
<meta property="twitter:player:height" content="{{.EmbedHeight}}">
<meta property="og:video" content="{{.EmbedURL}}">
<meta property="og:video:secure_url" content="{{.EmbedURL}}">
<meta property="og:video:type" content="text/html">
<meta property="og:video:width" content="{{.EmbedWidth}}">
<meta property="og:video:height" content="{{.EmbedHeight}}">
<meta property="og:image" content="{{.PreviewURL}}">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="675">
<meta property="twitter:image" content="{{.PreviewURL}}">
<link rel="stylesheet" href="/static/asciinema-player.css">
<style>` + themeCSS + commonCSS + `
html, body { height: 100%; margin: 0; }
body { display: flex; flex-direction: column; }
#player { flex: 1 1 0; min-height: 0; background: var(--bg); }
#player-bar { flex: 0 0 auto; box-sizing: border-box; padding: .5rem 1rem; display: flex; flex-wrap: wrap; gap: .4rem; justify-content: space-between; align-items: center; }
#player-bar-left { display: flex; gap: 1rem; align-items: center; font-family: sans-serif; font-size: .85rem; }
#player-bar-right { display: flex; align-items: center; }
</style>
</head>
<body>
<div id="player"></div>
<div id="player-bar">
<div id="player-bar-left">
{{if .IsOwner}}
<a href="/user/my-recordings" style="color:inherit">← My recordings</a>
<form method="POST" action="/recordings/{{.SecretToken}}/delete" style="margin:0">
<button onclick="return confirm('Delete this recording?')">Delete this recording</button>
</form>
{{end}}
</div>
<div id="player-bar-right">
{{if .LiveStream}}
{{if .UpstreamPlayer}}
<script src="/static/asciinema-player.min.js"></script>
<script>
var isLive = true;
var upstreamEl = document.getElementById('player');
function createUpstreamPlayer(themeID) {
upstreamEl.innerHTML = '';
AsciinemaPlayer.create({{.CastSrc}}, upstreamEl, {
fit: 'both', theme: themeID, cols: {{.TermCols}}, rows: {{.TermRows}}, autoPlay: true, bufferTime: 20,
});
}
function createPlayer() {}
function onThemeChange(id, themeObj) { createUpstreamPlayer(id); }
</script>
{{else}}
<script>
window.liveplayer = { containerId: 'player', wsUrl: {{.CastSrc}} };
window.liveplayer.setTheme = function(themeObj) {
window.liveplayer.theme = themeObj;
};
</script>
<script type="module" src="/static/live-player.js"></script>
<script>
var isLive = true;
function createPlayer() {}
function onThemeChange(id, themeObj) {
if (!themeObj) return;
window.liveplayer.setTheme(themeObj);
}
</script>
{{end}}
{{else}}
<script src="/static/asciinema-player.min.js"></script>
<script>
// Defined as a global so themeBar's applyTheme() can call it.
var src = {{.CastSrc}};
var el = document.getElementById('player');
var STORAGE_KEY = 'asciinema-pos-' + src;
var player = null;
var isPlaying = false;
function wirePlayState(p) {
p.addEventListener('play', function() { isPlaying = true; });
p.addEventListener('pause', function() { isPlaying = false; });
p.addEventListener('ended', function() {
isPlaying = false;
localStorage.removeItem(STORAGE_KEY);
});
// The terminal text surface is focusable by default (for copy/paste)
// but it's not a control — remove it from the tab order so keyboard
// navigation goes straight to the actual controls.
var termText = el.querySelector('.ap-term-text');
if (termText) termText.removeAttribute('tabindex');
// Show the control bar when any child element receives focus so that
// keyboard users can see and interact with the controls. The player
// toggles .ap-hud on .ap-wrapper to show/hide the control bar.
var wrapper = el.querySelector('.ap-wrapper');
if (wrapper) {
el.addEventListener('focusin', function() {
wrapper.classList.add('ap-hud');
});
el.addEventListener('focusout', function(e) {
if (!el.contains(e.relatedTarget)) {
wrapper.classList.remove('ap-hud');
}
});
}
}
var isLive = false;
function createPlayer(themeID, seekTo, autoPlay) {
el.innerHTML = '';
var opts = {fit: 'both', theme: themeID, cols: {{.TermCols}}, rows: {{.TermRows}}, autoPlay: autoPlay, bufferTime: 20};
opts.preload = true;
var p = AsciinemaPlayer.create(src, el, opts);
wirePlayState(p);
if (seekTo > 0) p.seek(seekTo);
return p;
}
function onThemeChange(themeID) {
if (player) {
// Recreate with new theme, restoring position and play state.
// getCurrentTime() wraps a synchronous driver call — resolves in
// the same microtask tick, so seek/play happen before first paint.
var playing = isPlaying;
if (isLive) {
player = createPlayer(themeID, 0, true);
} else {
player.getCurrentTime().then(function(t) {
player = createPlayer(themeID, t, playing);
});
}
} else {
// Player not yet mounted — for live streams autoPlay immediately,
// for recordings restore saved position.
if (isLive) {
player = createPlayer(themeID, 0, true);
} else {
var saved = parseFloat(localStorage.getItem(STORAGE_KEY));
player = createPlayer(themeID, saved, false);
}
}
}
// Click on .ap-wrapper (the letterbox area around the terminal) but not
// inside .ap-player (the terminal surface + controls) to toggle play/pause
// and briefly show the control bar so the user sees the new state.
var hudTimer = null;
el.addEventListener('click', function(e) {
if (!player) return;
var wrapper = e.target.closest('.ap-wrapper');
if (!wrapper) return;
if (e.target.closest('.ap-player')) return;
if (isPlaying) { player.pause(); } else { player.play(); }
wrapper.classList.add('ap-hud');
if (hudTimer) clearTimeout(hudTimer);
hudTimer = setTimeout(function() { wrapper.classList.remove('ap-hud'); hudTimer = null; }, 1000);
});
// Save playback position on page unload.
// getCurrentTime() wraps a synchronous driver call in a Promise, so it
// resolves within the same microtask tick. Browsers drain the microtask
// queue before tearing down the page, so localStorage.setItem fires in
// time. Not guaranteed by spec but works reliably in practice.
window.addEventListener('beforeunload', function() {
if (!player) return;
player.getCurrentTime().then(function(t) {
if (t > 0) localStorage.setItem(STORAGE_KEY, t);
});
});
</script>
{{end}}
` + themeBar + `
</div>
</div>
</body>
</html>
`))
type playerData struct {
pageTheme
Title string
AppTitle string
CastURL string // raw URL for the <link> tag
CastSrc template.JS // JSON-encoded URL for AsciinemaPlayer.create()
IsOwner bool
SecretToken string
TermCols int
TermRows int
RecordingURL string // full public URL for og:url
EmbedURL string // full embed URL with dark/light params
EmbedWidth int
EmbedHeight int
PreviewURL string // full URL to the SVG preview image
LiveStream bool // if true: autoPlay, no preload, no seek restoration
UpstreamPlayer bool // if true: use asciinema-player.min.js instead of live-player.js
}
const (
cookieDarkTheme = "asciinema-theme-dark"
cookieLightTheme = "asciinema-theme-light"
cookieMode = "asciinema-theme-mode"
defaultDarkThemeID = "asciinema"
defaultLightThemeID = "solarized-light"
defaultMode = "auto"
)
// pageTheme holds the resolved colours and selections for server-side rendering.
// Embed this in every template data struct.
type pageTheme struct {
ThemeBg string // resolved background for this request (used for mode=dark/light)
ThemeFg string // resolved foreground for this request (used for mode=dark/light)
ThemeRed string // resolved red (color-1) for this request
DarkID string // selected dark theme id
LightID string // selected light theme id
Mode string // "dark" | "light" | "auto"
DarkThemes []themeInfo
LightThemes []themeInfo
// For mode=auto: both polarities so the server can emit a @media rule
// and the browser resolves the correct theme with no JS required.
AutoDarkBg string
AutoDarkFg string
AutoDarkRed string
AutoLightBg string
AutoLightFg string
AutoLightRed string
// Cookie names exposed to templates so themeBar can write them.
CookieDark string
CookieLight string
CookieMode string
}
func cookieVal(r *http.Request, name string) string {
if c, err := r.Cookie(name); err == nil {
return c.Value
}
return ""
}
// resolveEmbedThemes resolves the dark/light theme IDs for embed and preview
// pages from query params, falling back to the owner's DB preferences, then
// server defaults.
func resolveEmbedThemes(r *http.Request, db *sql.DB, userID sql.NullInt64) (darkID, lightID string) {
darkID = r.URL.Query().Get("dark")
lightID = r.URL.Query().Get("light")
if themesByID[darkID].ID == "" || themesByID[lightID].ID == "" {
ownerDark, ownerLight := getOwnerTheme(db, userID)
if themesByID[darkID].ID == "" {
darkID = ownerDark
}
if themesByID[lightID].ID == "" {
lightID = ownerLight
}
}
return
}
// resolveTheme reads the three theme cookies and returns the active colours.
// For mode=auto the server falls back to the dark theme; JS corrects on load.
func resolveTheme(r *http.Request) pageTheme {
darkID := defaultDarkThemeID
if v := cookieVal(r, cookieDarkTheme); themesByID[v].ID != "" {
darkID = v
}
lightID := defaultLightThemeID
if v := cookieVal(r, cookieLightTheme); themesByID[v].ID != "" {
lightID = v
}
mode := defaultMode
if v := cookieVal(r, cookieMode); v == "dark" || v == "light" || v == "auto" {
mode = v
}
// Resolve which theme is active server-side.
activeID := darkID
if mode == "light" {
activeID = lightID
}
// mode=auto: can't know OS preference server-side; use dark as safe default.
t := themesByID[activeID]
dark := themesByID[darkID]
light := themesByID[lightID]
return pageTheme{
ThemeBg: t.Background,
ThemeFg: t.Foreground,
ThemeRed: t.Red,
DarkID: darkID,
LightID: lightID,
Mode: mode,
DarkThemes: darkThemes,
LightThemes: lightThemes,
AutoDarkBg: dark.Background,
AutoDarkFg: dark.Foreground,
AutoDarkRed: dark.Red,
AutoLightBg: light.Background,
AutoLightFg: light.Foreground,
AutoLightRed: light.Red,
CookieDark: cookieDarkTheme,
CookieLight: cookieLightTheme,
CookieMode: cookieMode,
}
}
func servePlayerPage(w http.ResponseWriter, r *http.Request, a *Asciicast, sessionUser *User, appTitle string, db *sql.DB, baseURL string) {
title := "recording"
if a.Title.Valid && a.Title.String != "" {
title = a.Title.String
}
isOwner := sessionUser != nil && a.UserID.Valid && sessionUser.ID == a.UserID.Int64
pt := resolveTheme(r)
// Persist the authenticated owner's theme preferences so that Mastodon
// crawlers (which have no cookies) still get the owner's chosen themes
// baked into the embed URL.
if isOwner {
syncUserTheme(db, sessionUser.ID, pt.DarkID, pt.LightID)
}
// For the embed URL, use the owner's DB-stored preferences rather than
// the current request's cookies (which may belong to a crawler).
ownerDark, ownerLight := getOwnerTheme(db, a.UserID)
embedW, embedH := embedDimensions(a.TermCols, a.TermRows)
recordingURL := baseURL + "/a/" + a.SecretToken
embedURL := fmt.Sprintf("%s/a/%s/embed?dark=%s&light=%s",
baseURL, a.SecretToken, ownerDark, ownerLight)
previewURL := fmt.Sprintf("%s/a/%s/preview.png?dark=%s&light=%s",
baseURL, a.SecretToken, ownerDark, ownerLight)
castURL := "/a/" + a.SecretToken + ".cast"
src, _ := json.Marshal(castURL)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
playerTmpl.Execute(w, playerData{
pageTheme: pt,
Title: title,
AppTitle: appTitle,
CastURL: castURL,
CastSrc: template.JS(src),
IsOwner: isOwner,
SecretToken: a.SecretToken,
TermCols: a.TermCols,
TermRows: a.TermRows,
RecordingURL: recordingURL,
EmbedURL: embedURL,
EmbedWidth: embedW,
EmbedHeight: embedH,
PreviewURL: previewURL,
})
}
// ---------------------------------------------------------------------------
// Recordings management page
// ---------------------------------------------------------------------------
var recordingsTmpl = template.Must(template.New("recordings").Parse(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>My recordings — {{.AppTitle}}</title>
<style>` + themeCSS + commonCSS + `
body { max-width: 800px; margin: 2rem auto; padding: 0 1rem; }
h1 { margin-bottom: 1.5rem; }
h2 { margin: 2rem 0 1rem; }
table { width: 100%; border-collapse: collapse; }
th { text-align: left; border-bottom: 2px solid currentColor; padding: .4rem .6rem; }
td { padding: .4rem .6rem; border-bottom: 1px solid color-mix(in oklab, var(--fg) 30%, var(--bg)); vertical-align: middle; }
.empty { opacity: .5; font-style: italic; }
.stream-ended { opacity: .5; }
.stream-offline { opacity: .7; border-bottom: 1px dotted currentColor; cursor: help; }
.stream-actions { display: flex; gap: .5rem; align-items: center; }
.account-delete { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid color-mix(in oklab, var(--fg) 30%, var(--bg)); }
.title-view { display: flex; align-items: center; gap: .4rem; }
.title-edit { display: none; align-items: center; gap: .4rem; }
.title-edit input { width: 18rem; }
#page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1.5rem; }
#bottom-bar { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid color-mix(in oklab, var(--fg) 20%, var(--bg)); display: flex; justify-content: flex-end; }
@media (max-width: 600px) {
table, thead, tbody, tr, th, td { display: block; }
thead { display: none; }
tr { border: 1px solid color-mix(in oklab, var(--fg) 25%, var(--bg)); border-radius: 4px; margin-bottom: .75rem; }
td { display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid color-mix(in oklab, var(--fg) 10%, var(--bg)); }
td:last-child { border-bottom: none; }
td::before { content: attr(data-label); opacity: .6; flex-shrink: 0; margin-right: 1rem; }
td[data-label=""] { justify-content: flex-end; }
td[data-label=""]::before { display: none; }
.title-edit input { width: 100%; }
}
</style>
</head>
<body>
<div id="page-header">
<h1 style="margin:0">My recordings</h1>
<div style="display:flex;gap:1rem;align-items:center">
<span style="opacity:.6">{{.Username}}</span>
<form method="POST" action="/logout" style="margin:0">
<button>Log out</button>
</form>
</div>
</div>
{{if .Streams}}
<h2>My streams</h2>
<table>
<thead><tr><th>Title</th><th>Status</th><th>Last active</th><th></th></tr></thead>
<tbody>
{{range .Streams}}
<tr>
<td data-label="Title">
<span class="title-view">
<a href="/s/{{.PublicToken}}">{{if .Title}}{{.Title}}{{else}}<span class="empty">(untitled)</span>{{end}}</a>
<button type="button" class="rename-btn" aria-label="Rename this stream">Rename</button>
</span>
<span class="title-edit" role="group" aria-label="Rename stream">
<form method="POST" action="/streams/{{.PublicToken}}/rename" style="margin:0;display:flex;align-items:center;gap:.4rem">
<input type="text" name="title" value="{{.Title}}" aria-label="Stream title" autocomplete="off">
<button type="submit">Save</button>
<button type="button" class="cancel-btn">Cancel</button>
</form>
</span>
</td>
<td data-label="Status">
{{if .Live}}<span class="live-badge">LIVE</span>
{{else if .Ended}}<span class="stream-ended">ended</span>
{{else}}<span class="stream-offline" title="Resume with: {{.ResumeCmd}}">offline</span>
{{end}}
</td>
<td data-label="Last active">{{.UpdatedAt}}</td>
<td data-label="">
<div class="stream-actions">
<form method="POST" action="/streams/{{.PublicToken}}/delete" style="margin:0">
<button class="danger" onclick="return confirm('Delete this stream?')">Delete</button>
</form>
</div>
</td>
</tr>
{{end}}
</tbody>
</table>
{{end}}
{{if .Recordings}}
<h2>My recordings</h2>
<table>
<thead><tr><th>Title</th><th>Duration</th><th>Date</th><th></th></tr></thead>
<tbody>
{{range .Recordings}}
<tr>
<td data-label="Title">
<span class="title-view">
<a href="/a/{{.SecretToken}}">{{if .Title}}{{.Title}}{{else}}<span class="empty">(untitled)</span>{{end}}</a>
<button type="button" class="rename-btn" aria-label="Rename this recording">Rename</button>
</span>
<span class="title-edit" role="group" aria-label="Rename recording">
<form method="POST" action="/recordings/{{.SecretToken}}/rename" style="margin:0;display:flex;align-items:center;gap:.4rem">
<input type="text" name="title" value="{{.Title}}" aria-label="Recording title" autocomplete="off">
<button type="submit">Save</button>
<button type="button" class="cancel-btn">Cancel</button>
</form>
</span>
</td>
<td data-label="Duration">{{.Duration}}</td>
<td data-label="Date">{{.Date}}</td>
<td data-label="">
<form method="POST" action="/recordings/{{.SecretToken}}/delete" style="margin:0">
<button class="danger" onclick="return confirm('Delete this recording?')">Delete</button>
</form>
</td>
</tr>
{{end}}
</tbody>
</table>
{{else}}
<p class="empty">No recordings yet.</p>
{{end}}
<div class="account-delete">
<form method="POST" action="/user/delete-account"
onsubmit="return confirm('Delete your account and ALL recordings? This cannot be undone.')">
<button class="danger">Delete account and all recordings</button>
</form>
</div>
<script>
document.querySelectorAll('tr').forEach(function(row) {
var view = row.querySelector('.title-view');
var edit = row.querySelector('.title-edit');
if (!view || !edit) return;
var renameBtn = view.querySelector('.rename-btn');
var cancelBtn = edit.querySelector('.cancel-btn');
var input = edit.querySelector('input');
function showEdit() {
view.style.display = 'none';
edit.style.display = 'flex';
input.focus();
input.select();
}
function showView() {
edit.style.display = 'none';
view.style.display = 'flex';
renameBtn.focus();
}
renameBtn.addEventListener('click', showEdit);
cancelBtn.addEventListener('click', showView);
input.addEventListener('keydown', function(e) {
if (e.key === 'Escape') { e.preventDefault(); showView(); }
// Enter submits the form natively — no handling needed.
});
});
</script>
<div id="bottom-bar">
` + themeBar + `
</div>
</body>
</html>
`))
type recordingEntry struct {
SecretToken string
Title string
Duration string
Date string
}
type streamEntry struct {
PublicToken string
Title string
Live bool
Ended bool
UpdatedAt string // human-readable relative time
ResumeCmd string // "asciinema stream --remote <public_token>"
}
type recordingsData struct {
pageTheme
AppTitle string
Username string
Recordings []recordingEntry
Streams []streamEntry
}
// GET /user/my-recordings
func (s *Server) handleUserRecordingsList() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
user, err := s.sessionUser(r)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if user == nil {
http.Redirect(w, r, "/connect/no-install-id", http.StatusSeeOther)
return
}
recs, err := listUserRecordings(s.db, user.ID)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
entries := make([]recordingEntry, len(recs))
for i, r := range recs {
title := ""
if r.Title.Valid {
title = r.Title.String
}
entries[i] = recordingEntry{
SecretToken: r.SecretToken,
Title: title,
Duration: formatDuration(r.Duration),
Date: r.InsertedAt.Format("2006-01-02"),
}
}
streams, err := listUserStreams(s.db, user.ID)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
streamEntries := make([]streamEntry, len(streams))
for i, st := range streams {
title := ""
if st.Title.Valid {
title = st.Title.String
}
streamEntries[i] = streamEntry{
PublicToken: st.PublicToken,
Title: title,
Live: st.Live,
Ended: st.Ended,
UpdatedAt: timeAgo(st.UpdatedAt),
ResumeCmd: "asciinema stream --remote " + st.PublicToken,
}
}
pt := resolveTheme(r)
syncUserTheme(s.db, user.ID, pt.DarkID, pt.LightID)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
recordingsTmpl.Execute(w, recordingsData{
pageTheme: pt,
AppTitle: s.cfg.AppTitle,
Username: user.Username.String,
Recordings: entries,
Streams: streamEntries,
})
})
}
// POST /recordings/{token}/rename
func (s *Server) handleRecordingBrowserRename() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
user, err := s.sessionUser(r)
if err != nil || user == nil {
http.Error(w, "Unauthorized", http.StatusUnauthorized)
return
}
token := r.PathValue("token")
a, err := getAsciicastBySecretToken(s.db, token)
if err != nil || a == nil {
http.NotFound(w, r)
return
}
if !a.UserID.Valid || a.UserID.Int64 != user.ID {
http.Error(w, "Forbidden", http.StatusForbidden)
return
}
r.ParseForm()
title := strings.TrimSpace(r.FormValue("title"))
if err := updateAsciicast(s.db, a.ID, &title, nil); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/user/my-recordings", http.StatusSeeOther)
})
}
// POST /recordings/{token}/delete
func (s *Server) handleRecordingBrowserDelete() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
user, err := s.sessionUser(r)
if err != nil || user == nil {
http.Error(w, "Unauthorized", http.StatusUnauthorized)
return
}
token := r.PathValue("token")
a, err := getAsciicastBySecretToken(s.db, token)
if err != nil || a == nil {
http.NotFound(w, r)
return
}
if !a.UserID.Valid || a.UserID.Int64 != user.ID {
http.Error(w, "Forbidden", http.StatusForbidden)
return
}
if err := deleteAsciicast(s.db, a.ID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/user/my-recordings", http.StatusSeeOther)
})
}
// POST /user/delete-account
func (s *Server) handleUserDeleteAccount() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
user, err := s.sessionUser(r)
if err != nil || user == nil {
http.Error(w, "Unauthorized", http.StatusUnauthorized)
return
}
if _, err := deleteUserAndEverything(s.db, user.ID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
s.clearSessionCookie(w, r)
http.Redirect(w, r, "/", http.StatusSeeOther)
})
}
// ---------------------------------------------------------------------------
// Root + standalone login page
// ---------------------------------------------------------------------------
var loginTmpl = template.Must(template.New("login").Parse(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Log in — {{.AppTitle}}</title>
<style>` + themeCSS + commonCSS + `
body { max-width: 380px; margin: 4rem auto; padding: 0 1rem; }
form button { margin-top: 1rem; padding: .5rem 1.2rem; }
.error { color: #c00; margin: .5rem 0; }
.muted { opacity: .6; }
</style>
</head>
<body>
<h1>Log in</h1>
<p class="muted" style="margin-top:-.5rem">Welcome to {{.AppTitle}}.</p>
{{if .Error}}<p class="error">{{.Error}}</p>{{end}}
{{if .ShowRegister}}
<h2>Set new password</h2>
<form method="POST" action="/reset-password">
<label>Invite token<input type="text" name="invite_token" required autocomplete="off"></label>
<label>New password<input type="password" name="password" required></label>
<label>Confirm password<input type="password" name="confirm" required></label>
<button type="submit">Set password & log in</button>
</form>
{{else}}
<form method="POST" action="/login">
<label>Username<input type="text" name="username" required autocomplete="username"></label>
<label>Password<input type="password" name="password" required autocomplete="current-password"></label>
<button type="submit">Log in</button>
</form>
{{end}}
<div id="top-bar">
` + themeBar + `
</div>
</body>
</html>
`))
type loginData struct {
pageTheme
AppTitle string
Error string
ShowRegister bool // shown when admin has reset the user's password
}
// GET / — redirect to my-recordings if logged in, else to /login
func (s *Server) handleRoot() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
user, err := s.sessionUser(r)
if err != nil || user == nil {
http.Redirect(w, r, "/login", http.StatusSeeOther)
return
}
http.Redirect(w, r, "/user/my-recordings", http.StatusSeeOther)
})
}
// GET /login
func (s *Server) handleLoginShow() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Already logged in? Go to recordings.
user, _ := s.sessionUser(r)
if user != nil {
http.Redirect(w, r, "/user/my-recordings", http.StatusSeeOther)
return
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
loginTmpl.Execute(w, loginData{pageTheme: resolveTheme(r), AppTitle: s.cfg.AppTitle, Error: r.URL.Query().Get("error")})
})
}
// POST /login
func (s *Server) handleLoginSubmit() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
pt := resolveTheme(r)
username := strings.TrimSpace(r.FormValue("username"))
user, err := s.authenticateUser(username, r.FormValue("password"))
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if user == nil {
msg := s.loginErrorMessage(username)
pending, _ := hasPendingInvite(s.db, username)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusUnprocessableEntity)
loginTmpl.Execute(w, loginData{pageTheme: pt, AppTitle: s.cfg.AppTitle, Error: msg, ShowRegister: pending})
return
}
if err := s.setSessionCookie(w, user.ID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/user/my-recordings", http.StatusSeeOther)
})
}
// ---------------------------------------------------------------------------
// Connect page (register / login / link CLI)
// ---------------------------------------------------------------------------
var connectTmpl = template.Must(template.New("connect").Parse(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Link CLI — {{.AppTitle}}</title>
<style>` + themeCSS + commonCSS + `
body { max-width: 480px; margin: 3rem auto; padding: 0 1rem; }
h2 { margin-top: 2rem; }
form button { margin-top: 1rem; padding: .5rem 1.2rem; }
.error { color: #c00; margin: .5rem 0; }
.sep { text-align: center; margin: 1.5rem 0; opacity: .5; }
.info { background: color-mix(in oklab, var(--bg) 80%, var(--fg)); padding: .8rem; border-radius: 4px; font-family: monospace; word-break: break-all; border: 1px solid currentColor; }
</style>
</head>
<body>
<h1>Link CLI to your account</h1>
<p>CLI install ID:</p>
<div class="info">{{.InstallID}}</div>
{{if .Linked}}
<p>✓ CLI successfully linked to account <strong>{{.Username}}</strong>. You can close this page and upload again.</p>
<form method="POST" action="/logout" style="margin-top:.5rem">
<button type="submit">Log out</button>
</form>
{{else if .LoggedIn}}
<h2>You are logged in as <strong>{{.Username}}</strong></h2>
<form method="POST" action="/connect/{{.InstallID}}/link">
<button type="submit">Link this CLI to your account</button>
</form>
<form method="POST" action="/logout" style="margin-top:.5rem">
<button type="submit">Log out</button>
</form>
{{else}}
{{if .Error}}<p class="error">{{.Error}}</p>{{end}}
<h2>Register</h2>
<form method="POST" action="/connect/{{.InstallID}}/register">
<label>Invite token<input type="text" name="invite_token" required autocomplete="off"></label>
<label>Password<input type="password" name="password" required></label>
<label>Confirm password<input type="password" name="confirm" required></label>
<button type="submit">Register & link CLI</button>
</form>
<div class="sep">— or —</div>
<h2>Log in</h2>
<form method="POST" action="/connect/{{.InstallID}}/login">
<label>Username<input type="text" name="username" required autocomplete="username"></label>
<label>Password<input type="password" name="password" required autocomplete="current-password"></label>
<button type="submit">Log in & link CLI</button>
</form>
{{end}}
<div id="top-bar">
` + themeBar + `
</div>
</body>
</html>
`))
type connectData struct {
pageTheme
AppTitle string
InstallID string
LoggedIn bool
Linked bool
Username string
Error string
}
// GET /connect/:install_id
func (s *Server) handleConnectShow() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
installID := r.PathValue("install_id")
user, err := s.sessionUser(r)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
data := connectData{pageTheme: resolveTheme(r), AppTitle: s.cfg.AppTitle, InstallID: installID}
if user != nil {
data.LoggedIn = true
data.Username = user.Username.String
}
if r.URL.Query().Get("linked") == "1" {
data.Linked = true
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
connectTmpl.Execute(w, data)
})
}
// POST /connect/:install_id/register
func (s *Server) handleConnectRegister() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
installID := r.PathValue("install_id")
r.ParseForm()
inviteToken := strings.TrimSpace(r.FormValue("invite_token"))
password := r.FormValue("password")
confirm := r.FormValue("confirm")
pt := resolveTheme(r)
renderErr := func(msg string) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusUnprocessableEntity)
connectTmpl.Execute(w, connectData{pageTheme: pt, AppTitle: s.cfg.AppTitle, InstallID: installID, Error: msg})
}
if inviteToken == "" || password == "" {
renderErr("All fields are required.")
return
}
if password != confirm {
renderErr("Passwords do not match.")
return
}
if len(password) < 8 {
renderErr("Password must be at least 8 characters.")
return
}
inv, err := getInvite(s.db, inviteToken)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if inv == nil || inv.UsedAt.Valid {
renderErr("Invalid or already-used invite token.")
return
}
hash, err := bcrypt.GenerateFromPassword([]byte(password), 12)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
userID, err := createUser(s.db, inv.Username, string(hash))
if err != nil {
renderErr("Username already taken.")
return
}
if err := useInvite(s.db, inviteToken); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if err := linkCLIToUser(s.db, installID, userID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if err := s.setSessionCookie(w, userID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/connect/"+url.PathEscape(installID)+"?linked=1", http.StatusSeeOther)
})
}
// POST /reset-password — set a new password using an invite token.
// No CLI linking; used when the admin runs reset-password for an existing user.
func (s *Server) handlePasswordReset() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
pt := resolveTheme(r)
renderErr := func(msg string) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusUnprocessableEntity)
loginTmpl.Execute(w, loginData{pageTheme: pt, AppTitle: s.cfg.AppTitle, Error: msg, ShowRegister: true})
}
inviteToken := strings.TrimSpace(r.FormValue("invite_token"))
password := r.FormValue("password")
confirm := r.FormValue("confirm")
if inviteToken == "" || password == "" {
renderErr("All fields are required.")
return
}
if password != confirm {
renderErr("Passwords do not match.")
return
}
if len(password) < 8 {
renderErr("Password must be at least 8 characters.")
return
}
inv, err := getInvite(s.db, inviteToken)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if inv == nil || inv.UsedAt.Valid {
renderErr("Invalid or already-used invite token.")
return
}
hash, err := bcrypt.GenerateFromPassword([]byte(password), 12)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
user, err := getUserByUsername(s.db, inv.Username)
if err != nil || user == nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if _, err := s.db.Exec(`UPDATE users SET password_hash = ? WHERE id = ?`, string(hash), user.ID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if err := useInvite(s.db, inviteToken); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if err := s.setSessionCookie(w, user.ID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/user/my-recordings", http.StatusSeeOther)
})
}
// POST /connect/:install_id/login
// authenticateUser looks up a user by username and verifies their password.
// Returns nil, nil if the credentials are wrong (not an error).
func (s *Server) authenticateUser(username, password string) (*User, error) {
user, err := getUserByUsername(s.db, username)
if err != nil {
return nil, err
}
if user == nil || !user.PasswordHash.Valid {
return nil, nil
}
if err := bcrypt.CompareHashAndPassword([]byte(user.PasswordHash.String), []byte(password)); err != nil {
return nil, nil
}
return user, nil
}
// loginErrorMessage returns a user-facing error for a failed login.
// If the username has a pending invite (password was reset), it returns a
// more specific message instead of the generic "invalid credentials".
func (s *Server) loginErrorMessage(username string) string {
pending, err := hasPendingInvite(s.db, username)
if err == nil && pending {
return "Your password has been reset. Ask your admin for a new invite token."
}
return "Invalid username or password."
}
func (s *Server) handleConnectLogin() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
installID := r.PathValue("install_id")
r.ParseForm()
pt := resolveTheme(r)
renderErr := func(msg string) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusUnprocessableEntity)
connectTmpl.Execute(w, connectData{pageTheme: pt, AppTitle: s.cfg.AppTitle, InstallID: installID, Error: msg})
}
username := strings.TrimSpace(r.FormValue("username"))
user, err := s.authenticateUser(username, r.FormValue("password"))
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if user == nil {
renderErr(s.loginErrorMessage(username))
return
}
if err := linkCLIToUser(s.db, installID, user.ID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
if err := s.setSessionCookie(w, user.ID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/connect/"+url.PathEscape(installID)+"?linked=1", http.StatusSeeOther)
})
}
// POST /connect/:install_id/link (already logged in)
func (s *Server) handleConnectLink() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
installID := r.PathValue("install_id")
user, err := s.sessionUser(r)
if err != nil || user == nil {
http.Redirect(w, r, "/connect/"+url.PathEscape(installID), http.StatusSeeOther)
return
}
if err := linkCLIToUser(s.db, installID, user.ID); err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/connect/"+url.PathEscape(installID)+"?linked=1", http.StatusSeeOther)
})
}
// POST /logout
func (s *Server) handleLogout() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
s.clearSessionCookie(w, r)
http.Redirect(w, r, "/", http.StatusSeeOther)
})
}
// ---------------------------------------------------------------------------
// Utilities
// ---------------------------------------------------------------------------
func formatDuration(secs float64) string {
total := int(secs)
m := total / 60
s := total % 60
return fmt.Sprintf("%dm %02ds", m, s)
}
func randomToken(n int) string {
b := make([]byte, n)
rand.Read(b)
return fmt.Sprintf("%x", b)[:n]
}
func jsonError(w http.ResponseWriter, msg string, code int) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(code)
json.NewEncoder(w).Encode(map[string]string{"error": msg})
}
func pathID(r *http.Request) (int64, error) {
return strconv.ParseInt(r.PathValue("id"), 10, 64)
}
func nullString(s sql.NullString) any {
if s.Valid {
return s.String
}
return nil
}
func nullInt64(n sql.NullInt64) any {
if n.Valid {
return n.Int64
}
return nil
}
func nullFloat64(f sql.NullFloat64) any {
if f.Valid {
return f.Float64
}
return nil
}
// cliFromRequest retrieves the authenticated CLI from the request context.
func cliFromRequest(r *http.Request) *CLI {
v := r.Context().Value(ctxCLI)
if v == nil {
return nil
}
return v.(*CLI)
}
// embedDimensions computes pixel width/height for the embed iframe based on
// the recorded terminal size using asciinema's default font metrics.
func embedDimensions(cols, rows int) (width, height int) {
const charW, charH, barH, pad = 7, 14, 32, 20
width = cols*charW + pad
height = rows*charH + barH + pad
if width > 1200 {
width = 1200
}
if height > 800 {
height = 800
}
return
}
// ---------------------------------------------------------------------------
// Themes overview page
// ---------------------------------------------------------------------------
var themesTmpl = template.Must(template.New("themes").Parse(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Themes — {{.AppTitle}}</title>
<link rel="stylesheet" href="/static/asciinema-player.css">
<style>` + themeCSS + commonCSS + `
body { max-width: 900px; margin: 2rem auto; padding: 0 1rem; }
h1 { margin-bottom: 2rem; }
.themes { display: grid; grid-template-columns: repeat(auto-fill, minmax(380px, 1fr)); gap: 1.5rem; }
.theme-card { border-radius: 6px; overflow: hidden; border: 1px solid color-mix(in oklab, var(--fg) 20%, var(--bg)); }
.theme-header { padding: .5rem .8rem; display: flex; justify-content: space-between; align-items: baseline; font-size: .9rem; }
.theme-name { font-weight: bold; }
.theme-mode { font-size: .75rem; opacity: .6; }
.palette { display: flex; height: 28px; }
.palette-swatch { flex: 1; }
.term-preview { padding: .75rem 1rem; font-family: "Cascadia Code", "Source Code Pro", Menlo, Consolas, monospace; font-size: .8rem; line-height: 1.5; }
.term-preview span { display: inline-block; padding: 0 .15em; }
</style>
</head>
<body>
<div id="top-bar">
` + themeBar + `
</div>
<h1>Themes</h1>
<div class="themes">
{{range .AllThemes}}
<div class="theme-card asciinema-player-theme-{{.ID}}">
<div class="theme-header" style="background:var(--term-color-background);color:var(--term-color-foreground)">
<span class="theme-name">{{.Label}}</span>
<span class="theme-mode">{{if .Dark}}dark{{else}}light{{end}}</span>
</div>
<div class="palette" style="background:var(--term-color-background)">
<div class="palette-swatch" style="background:var(--term-color-0)"></div>
<div class="palette-swatch" style="background:var(--term-color-1)"></div>
<div class="palette-swatch" style="background:var(--term-color-2)"></div>
<div class="palette-swatch" style="background:var(--term-color-3)"></div>
<div class="palette-swatch" style="background:var(--term-color-4)"></div>
<div class="palette-swatch" style="background:var(--term-color-5)"></div>
<div class="palette-swatch" style="background:var(--term-color-6)"></div>
<div class="palette-swatch" style="background:var(--term-color-7)"></div>
<div class="palette-swatch" style="background:var(--term-color-8)"></div>
<div class="palette-swatch" style="background:var(--term-color-9)"></div>
<div class="palette-swatch" style="background:var(--term-color-10)"></div>
<div class="palette-swatch" style="background:var(--term-color-11)"></div>
<div class="palette-swatch" style="background:var(--term-color-12)"></div>
<div class="palette-swatch" style="background:var(--term-color-13)"></div>
<div class="palette-swatch" style="background:var(--term-color-14)"></div>
<div class="palette-swatch" style="background:var(--term-color-15)"></div>
</div>
<div class="term-preview" style="background:var(--term-color-background);color:var(--term-color-foreground)">
<span style="color:var(--term-color-2)">user</span><span style="color:var(--term-color-foreground)">@</span><span style="color:var(--term-color-4)">host</span><span style="color:var(--term-color-foreground)"> ~ $ </span><span style="color:var(--term-color-3)">ls -la</span><br>
<span style="color:var(--term-color-4)">drwxr-xr-x</span><span style="color:var(--term-color-foreground)"> documents/</span><br>
<span style="color:var(--term-color-1)">error:</span><span style="color:var(--term-color-foreground)"> file not found</span><br>
<span style="color:var(--term-color-5)">function</span><span style="color:var(--term-color-foreground)"> hello() {</span> <span style="color:var(--term-color-8)">// comment</span>
</div>
</div>
{{end}}
</div>
</body>
</html>
`))
type themesData struct {
pageTheme
AppTitle string
AllThemes []themeInfo
}
// GET /themes
func (s *Server) handleThemesOverview() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
themesTmpl.Execute(w, themesData{
pageTheme: resolveTheme(r),
AppTitle: s.cfg.AppTitle,
AllThemes: themes,
})
})
}
// ---------------------------------------------------------------------------
// Recording embed page (for Mastodon/Twitter player cards)
// ---------------------------------------------------------------------------
type embedData struct {
CastSrc template.JS
TermCols int
TermRows int
DarkID string
LightID string
AutoDarkBg string
AutoDarkFg string
AutoDarkRed string
AutoLightBg string
AutoLightFg string
AutoLightRed string
}
var embedTmpl = template.Must(template.New("embed").Parse(`<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/static/asciinema-player.css">
<style>
:root { --bg: {{.AutoDarkBg}}; --fg: {{.AutoDarkFg}}; }
@media (prefers-color-scheme: light) {
:root { --bg: {{.AutoLightBg}}; --fg: {{.AutoLightFg}}; }
}
html, body { height: 100%; margin: 0; overflow: hidden; background: var(--bg); }
#player { width: 100%; height: 100%; }
</style>
</head>
<body>
<div id="player"></div>
<script src="/static/asciinema-player.min.js"></script>
<script>
(function() {
var src = {{.CastSrc}};
var el = document.getElementById('player');
var darkID = '{{.DarkID}}';
var lightID = '{{.LightID}}';
function create(themeID) {
el.innerHTML = '';
AsciinemaPlayer.create(src, el, {
autoPlay: true,
fit: 'both',
theme: themeID,
cols: {{.TermCols}},
rows: {{.TermRows}},
});
}
var mq = window.matchMedia('(prefers-color-scheme: dark)');
create(mq.matches ? darkID : lightID);
// Recreate player if OS mode changes while embed is open.
mq.addEventListener('change', function(e) {
create(e.matches ? darkID : lightID);
});
})();
</script>
</body>
</html>
`))
// drawLine draws a 2px-wide line between two points using Bresenham's algorithm.
func abs(x int) int {
if x < 0 {
return -x
}
return x
}
// parseHexColor parses a "#rrggbb" hex color string into an image/color.RGBA.
func parseHexColor(s string) color.RGBA {
s = strings.TrimPrefix(s, "#")
if len(s) != 6 {
return color.RGBA{R: 0xcc, G: 0xcc, B: 0xcc, A: 0xff}
}
var r, g, b uint8
fmt.Sscanf(s[:2], "%02x", &r)
fmt.Sscanf(s[2:4], "%02x", &g)
fmt.Sscanf(s[4:6], "%02x", &b)
return color.RGBA{R: r, G: g, B: b, A: 0xff}
}
// blendColor pre-blends fg onto bg at the given opacity (0–255), returning a
// fully opaque color. This avoids the blue fringe artifact from font
// antialiasing when compositing semi-transparent colors onto a background.
func blendColor(fg, bg color.RGBA, alpha uint8) color.RGBA {
a := float64(alpha) / 255.0
return color.RGBA{
R: uint8(float64(fg.R)*a + float64(bg.R)*(1-a)),
G: uint8(float64(fg.G)*a + float64(bg.G)*(1-a)),
B: uint8(float64(fg.B)*a + float64(bg.B)*(1-a)),
A: 0xff,
}
}
// ---------------------------------------------------------------------------
// Terminal cast playback (avt-go integration)
// ---------------------------------------------------------------------------
// castPlayback plays back a .cast file up to targetSecs and returns the
// terminal view (visible rows) and the terminal dimensions.
// castData is the raw (uncompressed) .cast bytes.
func castPlayback(castData []byte, targetSecs float64) ([]*types.Line, int, int) {
dec := json.NewDecoder(bytes.NewReader(castData))
// Parse header.
var header map[string]any
if err := dec.Decode(&header); err != nil {
return nil, 80, 24
}
cols := int(jsonFloat(header, "width"))
rows := int(jsonFloat(header, "height"))
if cols <= 0 {
cols = 80
}
if rows <= 0 {
rows = 24
}
vt := avt.New(cols, rows)
// Feed output events up to targetSecs.
for {
var event []any
if err := dec.Decode(&event); err != nil {
break // EOF or non-JSON line
}
if len(event) < 3 {
continue
}
ts, ok := event[0].(float64)
if !ok {
continue
}
if ts > targetSecs {
break
}
evType, ok := event[1].(string)
if !ok || evType != "o" {
continue
}
data, ok := event[2].(string)
if !ok {
continue
}
vt.FeedStr(data)
}
return vt.View(), cols, rows
}
// parseDuration parses a duration string with sub-second resolution for the
// ?time= query parameter. Accepts Go duration strings like "1m5s500ms" or
// plain seconds as a float like "65.5".
func parseDuration(s string) (float64, error) {
if s == "" {
return -1, nil // sentinel: use end of recording
}
// Try Go duration syntax first (handles "1m5s", "500ms", "1h2m3s4ms", etc.)
d, err := time.ParseDuration(s)
if err == nil {
return d.Seconds(), nil
}
// Fall back to plain float seconds.
f, err := strconv.ParseFloat(s, 64)
if err != nil {
return 0, fmt.Errorf("invalid time %q: use Go duration syntax like '1m5s500ms' or plain seconds", s)
}
return f, nil
}
// xterm256Color returns the standard xterm-256 color for index n (0–255).
// Indices 0–15 are the ANSI colors (handled separately via theme), so this
// is mainly for 16–255.
func xterm256Color(n uint8) color.RGBA {
if n < 16 {
// Shouldn't be called for 0-15, but handle gracefully.
return color.RGBA{0x80, 0x80, 0x80, 0xff}
}
if n >= 232 {
// Grayscale ramp: 232=0x08, 253=0xee, step=10
v := uint8(8 + 10*(int(n)-232))
return color.RGBA{v, v, v, 0xff}
}
// 6×6×6 color cube
idx := int(n) - 16
b := idx % 6
g := (idx / 6) % 6
r := idx / 36
cube := [6]uint8{0, 95, 135, 175, 215, 255}
return color.RGBA{cube[r], cube[g], cube[b], 0xff}
}
// resolveColor resolves a terminal Color (possibly nil) to an RGBA using the
// theme palette. isFg=true means "nil → theme foreground", isFg=false means
// "nil → theme background".
func resolveColor(c types.Color, theme themeInfo, isFg bool) color.RGBA {
if c == nil {
if isFg {
return parseHexColor(theme.Foreground)
}
return parseHexColor(theme.Background)
}
switch v := c.(type) {
case types.ColorIndexed:
if v.N < 16 {
return parseHexColor(theme.Color[v.N])
}
return xterm256Color(v.N)
case types.ColorRGB:
return color.RGBA{v.R, v.G, v.B, 0xff}
}
if isFg {
return parseHexColor(theme.Foreground)
}
return parseHexColor(theme.Background)
}
// GET /a/{token}/preview.png — PNG preview image for Mastodon og:image.
// Mastodon rejects SVG, so we render the same design as a PNG using gomono font.
//
// Query params:
// - type=cover (default) — info card with title/duration/dimensions
// - type=preview — full terminal grid render at the given time
// - time=<duration> — timestamp for preview mode; Go duration syntax
// e.g. "1m5s500ms" or plain seconds "65.5"; default = end of recording
func (s *Server) handleRecordingPreviewPNG() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
token := r.PathValue("token")
a, err := getAsciicastBySecretToken(s.db, token)
if err != nil || a == nil {
http.NotFound(w, r)
return
}
darkID, lightID := resolveEmbedThemes(r, s.db, a.UserID)
// Pick dark or light based on the request — default to dark.
// (no prefers-color-scheme in PNG; owner's dark theme is the canonical preview)
_ = lightID
theme := themesByID[darkID]
title := "recording"
if a.Title.Valid && a.Title.String != "" {
title = a.Title.String
}
previewType := r.URL.Query().Get("type")
if previewType == "" {
previewType = "cover"
}
var img *image.RGBA
var disposition string
safeTitle := strings.ReplaceAll(title, "/", "")
switch previewType {
case "preview":
// Parse ?time= query param.
targetSecs, err := parseDuration(r.URL.Query().Get("time"))
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if targetSecs < 0 {
targetSecs = a.Duration // default: end of recording
}
// Load and decompress cast data.
castData, err := s.readCastBlob(a.ID)
if err != nil {
http.Error(w, "Server error", http.StatusInternalServerError)
return
}
lines, cols, rows := castPlayback(castData, targetSecs)
img = renderTerminalPNG(lines, cols, rows, theme)
timeStr := r.URL.Query().Get("time")
if timeStr == "" {
timeStr = formatDuration(a.Duration)
}
disposition = safeTitle + " (Preview at " + timeStr + ").png"
default: // "cover"
img, err = renderCoverPNG(a, title, theme, s.cfg.AppTitle)
if err != nil {
http.Error(w, "render error", http.StatusInternalServerError)
return
}
disposition = safeTitle + " (Cover).png"
}
var buf bytes.Buffer
if err := png.Encode(&buf, img); err != nil {
http.Error(w, "render error", http.StatusInternalServerError)
return
}
data := buf.Bytes()
etag := fmt.Sprintf(`"%x"`, md5.Sum(data))
w.Header().Set("ETag", etag)
w.Header().Set("Cache-Control", "no-cache")
w.Header().Set("Content-Disposition", fmt.Sprintf(`inline; filename*=UTF-8''%s`, url.PathEscape(disposition)))
if r.Header.Get("If-None-Match") == etag {
w.WriteHeader(http.StatusNotModified)
return
}
w.Header().Set("Content-Type", "image/png")
w.Write(data)
})
}
// renderCoverPNG renders the existing info-card style PNG preview.
func renderCoverPNG(a *Asciicast, title string, theme themeInfo, appTitle string) (*image.RGBA, error) {
dur := formatDuration(a.Duration)
bg := parseHexColor(theme.Background)
fg := parseHexColor(theme.Foreground)
red := parseHexColor(theme.Red)
grn := parseHexColor(theme.Green)
yel := parseHexColor(theme.Yellow)
const W, H = 1200, 675
img := image.NewRGBA(image.Rect(0, 0, W, H))
// Fill background.
draw.Draw(img, img.Bounds(), &image.Uniform{bg}, image.Point{}, draw.Src)
// Text rendering setup.
face, err := opentype.NewFace(gomonoBoldFont, &opentype.FaceOptions{Size: 36, DPI: 96})
if err != nil {
return nil, err
}
defer face.Close()
d := &font.Drawer{Dst: img, Face: face}
drawText := func(x, y int, c color.RGBA, text string) int {
d.Dot = fixed.P(x, y)
d.Src = &image.Uniform{c}
d.DrawString(text)
return int(d.Dot.X.Ceil())
}
measureText := func(text string) int {
return int(d.MeasureString(text).Ceil())
}
// Header strip — height derived from font metrics so the title always fits.
hMetrics := face.Metrics()
hAscent := int(hMetrics.Ascent.Ceil())
hDescent := int(hMetrics.Descent.Ceil())
headerH := (hAscent + hDescent) * 12 / 10
draw.Draw(img, image.Rect(0, 0, W, headerH), &image.Uniform{bg}, image.Point{}, draw.Src)
// AppTitle centered in header — baseline at vertical center + ascent.
titleW := measureText(appTitle)
titleY := (headerH-hAscent-hDescent)/2 + hAscent
drawText((W-titleW)/2, titleY, fg, appTitle)
// Draw X close button — two diagonal lines via Bresenham.
xCol := blendColor(fg, bg, 120)
xCx, xCy, xR := W-36, headerH/2, 7
bresenham := func(x0, y0, x1, y1 int, c color.RGBA) {
dx, dy := abs(x1-x0), abs(y1-y0)
sx, sy := 1, 1
if x0 > x1 {
sx = -1
}
if y0 > y1 {
sy = -1
}
bErr := dx - dy
for {
img.SetRGBA(x0, y0, c)
if x0 == x1 && y0 == y1 {
break
}
e2 := 2 * bErr
if e2 > -dy {
bErr -= dy
x0 += sx
}
if e2 < dx {
bErr += dx
y0 += sy
}
}
}
bresenham(xCx-xR, xCy-xR, xCx+xR, xCy+xR, xCol)
bresenham(xCx+xR, xCy-xR, xCx-xR, xCy+xR, xCol)
// Separator line below header.
draw.Draw(img, image.Rect(0, headerH, W, headerH+1), &image.Uniform{blendColor(fg, bg, 60)}, image.Point{}, draw.Src)
// Line height derived from font metrics with 20% leading, same as terminal renderer.
fMetrics := face.Metrics()
lineH := (int(fMetrics.Ascent.Ceil()) + int(fMetrics.Descent.Ceil())) * 12 / 10
// 4 lines total (1 + 1 + blank + 1 + 1), content block height ≈ lineH*5.
// Center it vertically in the area below the header.
contentH := lineH * 5
y := headerH + (H-headerH-contentH)/2 + int(fMetrics.Ascent.Ceil())
dim := blendColor(fg, bg, 140)
dimmer := blendColor(fg, bg, 100)
// Line 1: > play "title"
x := drawText(60, y, dim, "> play ")
drawText(x, y, red, `"`+title+`"`)
y += lineH
// Line 2: playing terminal recording (dimmed)
drawText(60, y, dimmer, "playing terminal recording")
y += lineH * 2
// Line 3: dimensions
x = drawText(60, y, dim, "dimensions: ")
x = drawText(x, y, grn, fmt.Sprintf("%d cols", a.TermCols))
x = drawText(x, y, dim, " x ")
drawText(x, y, grn, fmt.Sprintf("%d rows", a.TermRows))
y += lineH
// Line 4: duration
x = drawText(60, y, dim, "duration: ")
drawText(x, y, yel, dur)
return img, nil
}
// cellGeometry holds the pre-computed metrics needed to paint terminal cells.
type cellGeometry struct {
padX, padY int
cellW, cellH int
ascent int
face font.Face
}
// usedDimensions computes the bounding box of non-default cells, ignoring
// trailing whitespace. Returns at least (1, 1).
func usedDimensions(lines []*types.Line) (usedCols, usedRows int) {
usedCols = 1
usedRows = 0
for r, line := range lines {
for c := len(line.Cells) - 1; c >= 0; c-- {
if !line.Cells[c].IsDefault() {
if c+1 > usedCols {
usedCols = c + 1
}
if r+1 > usedRows {
usedRows = r + 1
}
break
}
}
}
if usedRows == 0 {
usedRows = 1
}
return
}
// paintTerminal draws terminal cells into img using geom for layout.
// It stops early once pixel coordinates exceed the image bounds.
func paintTerminal(img *image.RGBA, geom cellGeometry, lines []*types.Line, usedCols, usedRows int, theme themeInfo) {
bounds := img.Bounds()
d := &font.Drawer{Dst: img, Face: geom.face}
glyphOffX := 0 // cellW == advPx always, so offset is 0
for row, line := range lines {
if row >= usedRows {
break
}
py := geom.padY + row*geom.cellH
if py >= bounds.Max.Y {
break
}
col := 0
for i := 0; i < len(line.Cells); i++ {
cell := line.Cells[i]
if col >= usedCols {
break
}
px := geom.padX + col*geom.cellW
if px >= bounds.Max.X {
break
}
pen := cell.Pen()
cellBg := resolveColor(pen.Background, theme, false)
cellFg := resolveColor(pen.Foreground, theme, true)
if pen.IsInverse() {
cellBg, cellFg = cellFg, cellBg
}
if pen.IsFaint() {
cellFg = blendColor(cellFg, cellBg, 140)
}
cellCols := 1
if cell.Occupancy() == types.OccupancyWideHead {
cellCols = 2
} else if cell.Occupancy() == types.OccupancyWideTail {
col++
continue
}
cellPxW := geom.cellW * cellCols
if pen.Background != nil || pen.IsInverse() {
draw.Draw(img, image.Rect(px, py, px+cellPxW, py+geom.cellH), &image.Uniform{cellBg}, image.Point{}, draw.Src)
}
ch := cell.Char()
if ch != ' ' && ch != 0 {
textX := px + glyphOffX
if cellCols == 2 {
wideAdv := int(d.MeasureString(string(ch)).Ceil())
textX = px + (cellPxW-wideAdv)/2
if textX < px {
textX = px
}
}
d.Dot = fixed.P(textX, py+geom.ascent)
d.Src = &image.Uniform{cellFg}
d.DrawString(string(ch))
}
col += cellCols
}
}
}
// newCellGeometry creates a cellGeometry for the given font size and padding.
// The caller is responsible for closing geom.face when done.
func newCellGeometry(fontSize float64, padX, padY int) (cellGeometry, error) {
face, err := opentype.NewFace(gomonoBoldFont, &opentype.FaceOptions{Size: fontSize, DPI: 72})
if err != nil {
return cellGeometry{}, err
}
d := &font.Drawer{Face: face}
advPx := int(d.MeasureString("M").Ceil())
m := face.Metrics()
ascent := int(m.Ascent.Ceil())
descent := int(m.Descent.Ceil())
return cellGeometry{
padX: padX,
padY: padY,
cellW: advPx,
cellH: (ascent + descent) * 12 / 10,
ascent: ascent,
face: face,
}, nil
}
// renderTerminalPNG renders a full terminal grid as a 1200×675 PNG image,
// fitting the font size to the used content area.
func renderTerminalPNG(lines []*types.Line, cols, rows int, theme themeInfo) *image.RGBA {
const W, H = 1200, 675
const padX, padY = 20, 20
const minFontSize, maxFontSize = 14.0, 32.0
availW := W - 2*padX
availH := H - 2*padY
usedCols, usedRows := usedDimensions(lines)
// Find the largest font size that fits usedCols×usedRows into availW×availH.
fitFontSize := func(maxPx int, count int, measureFn func(font.Face) int) float64 {
for fontSize := maxFontSize; fontSize >= minFontSize; fontSize -= 0.5 {
f, err := opentype.NewFace(gomonoBoldFont, &opentype.FaceOptions{Size: fontSize, DPI: 72})
if err != nil {
break
}
px := measureFn(f)
f.Close()
if px*count <= maxPx {
return fontSize
}
}
return minFontSize
}
fontSizeW := fitFontSize(availW, usedCols, func(f font.Face) int {
return int((&font.Drawer{Face: f}).MeasureString("M").Ceil())
})
fontSizeH := fitFontSize(availH, usedRows, func(f font.Face) int {
m := f.Metrics()
return (int(m.Ascent.Ceil()) + int(m.Descent.Ceil())) * 12 / 10
})
fontSize := fontSizeW
if fontSizeH < fontSize {
fontSize = fontSizeH
}
bg := parseHexColor(theme.Background)
img := image.NewRGBA(image.Rect(0, 0, W, H))
draw.Draw(img, img.Bounds(), &image.Uniform{bg}, image.Point{}, draw.Src)
geom, err := newCellGeometry(fontSize, padX, padY)
if err != nil {
return img
}
defer geom.face.Close()
paintTerminal(img, geom, lines, usedCols, usedRows, theme)
return img
}
// renderStreamPreviewPNG renders a terminal snapshot at a fixed font size,
// sizing the image to exactly fit the used content (trimming trailing whitespace).
func renderStreamPreviewPNG(lines []*types.Line, theme themeInfo) *image.RGBA {
const fontSize = 14.0
const padX, padY = 12, 12
usedCols, usedRows := usedDimensions(lines)
geom, err := newCellGeometry(fontSize, padX, padY)
if err != nil {
// Fallback: 1×1 blank image
return image.NewRGBA(image.Rect(0, 0, 1, 1))
}
defer geom.face.Close()
W := padX*2 + usedCols*geom.cellW
H := padY*2 + usedRows*geom.cellH
bg := parseHexColor(theme.Background)
img := image.NewRGBA(image.Rect(0, 0, W, H))
draw.Draw(img, img.Bounds(), &image.Uniform{bg}, image.Point{}, draw.Src)
paintTerminal(img, geom, lines, usedCols, usedRows, theme)
return img
}
// GET /a/{token}/preview.svg — stylized terminal SVG for og:image social previews.
func (s *Server) handleRecordingPreview() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
token := r.PathValue("token")
a, err := getAsciicastBySecretToken(s.db, token)
if err != nil || a == nil {
http.NotFound(w, r)
return
}
darkID, lightID := resolveEmbedThemes(r, s.db, a.UserID)
dark := themesByID[darkID]
light := themesByID[lightID]
title := "recording"
if a.Title.Valid && a.Title.String != "" {
title = a.Title.String
}
dur := formatDuration(a.Duration)
cols := a.TermCols
rows := a.TermRows
svgEsc := strings.NewReplacer("&", "&", "<", "<", ">", ">", `"`, """)
titleEsc := svgEsc.Replace(title)
appTitleEsc := svgEsc.Replace(s.cfg.AppTitle)
svg := fmt.Sprintf(`<svg xmlns="http://www.w3.org/2000/svg" width="1200" height="675" viewBox="0 0 1200 675">
<defs>
<style>
.bg { fill: %s } .fg { fill: %s } .red { fill: %s }
.grn { fill: %s } .yel { fill: %s } .blu { fill: %s }
.border { stroke: %s; stroke-opacity: 0.5 }
@media (prefers-color-scheme: light) {
.bg { fill: %s } .fg { fill: %s } .red { fill: %s }
.grn { fill: %s } .yel { fill: %s } .blu { fill: %s }
.border { stroke: %s }
}
</style>
</defs>
<!-- background -->
<rect width="1200" height="675" class="bg"/>
<!-- clip path for the box interior -->
<clipPath id="box-clip">
<rect x="60" y="60" width="1080" height="555" rx="14" ry="14"/>
</clipPath>
<!-- box background fill -->
<rect x="60" y="60" width="1080" height="555" rx="14" ry="14" class="bg"/>
<!-- header strip clipped to box -->
<rect x="60" y="60" width="1080" height="48" class="bg" clip-path="url(#box-clip)"/>
<!-- title in header using fg color -->
<text x="600" y="92" font-family="monospace" font-size="16" text-anchor="middle" class="fg">%s</text>
<!-- close button -->
<text x="1108" y="92" font-family="monospace" font-size="16" text-anchor="middle" class="fg" opacity="0.6">✕</text>
<!-- border drawn last so it cleanly frames everything -->
<rect x="60" y="60" width="1080" height="555" rx="14" ry="14" fill="none" class="border" stroke-width="2"/>
<!-- content -->
<text x="120" y="247" font-family="monospace" font-size="24">
<tspan class="fg" opacity="0.5">▶ play </tspan><tspan class="red">"%s"</tspan>
</text>
<text x="120" y="302" font-family="monospace" font-size="24" class="fg" opacity="0.35">playing terminal recording</text>
<text x="120" y="392" font-family="monospace" font-size="24">
<tspan class="fg" opacity="0.5">dimensions: </tspan><tspan class="grn">%d cols</tspan><tspan class="fg" opacity="0.5"> × </tspan><tspan class="grn">%d rows</tspan>
</text>
<text x="120" y="457" font-family="monospace" font-size="24">
<tspan class="fg" opacity="0.5">duration: </tspan><tspan class="yel">%s</tspan>
</text>
</svg>`,
// dark
dark.Background, dark.Foreground, dark.Red,
dark.Green, dark.Yellow, dark.Blue,
dark.Foreground,
// light overrides
light.Background, light.Foreground, light.Red,
light.Green, light.Yellow, light.Blue,
light.Foreground,
// content: header shows appTitle, body shows recording title
appTitleEsc, titleEsc,
cols, rows,
dur,
)
etag := fmt.Sprintf(`"%x"`, md5.Sum([]byte(svg)))
w.Header().Set("ETag", etag)
w.Header().Set("Cache-Control", "no-cache")
safeTitle := strings.ReplaceAll(title, "/", "")
w.Header().Set("Content-Disposition", fmt.Sprintf(`inline; filename*=UTF-8''%s`, url.PathEscape(safeTitle+" (Preview).svg")))
if r.Header.Get("If-None-Match") == etag {
w.WriteHeader(http.StatusNotModified)
return
}
w.Header().Set("Content-Type", "image/svg+xml")
w.Write([]byte(svg))
})
}
// GET /a/{token}/embed — bare player page for use in Mastodon/Twitter iframes.
func (s *Server) handleRecordingEmbed() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
token := r.PathValue("token")
a, err := getAsciicastBySecretToken(s.db, token)
if err != nil || a == nil {
http.NotFound(w, r)
return
}
// Theme resolution: query params → owner's DB preferences → defaults.
// Viewer cookies are not used — third-party cookie partitioning means
// they are never sent in cross-origin iframes anyway.
darkID, lightID := resolveEmbedThemes(r, s.db, a.UserID)
if themesByID[lightID].ID == "" {
lightID = defaultLightThemeID
}
dark := themesByID[darkID]
light := themesByID[lightID]
src, _ := json.Marshal("/a/" + a.SecretToken + ".cast")
// No X-Frame-Options — this page must be embeddable in third-party iframes.
w.Header().Set("Content-Security-Policy", "frame-ancestors *")
w.Header().Set("Content-Type", "text/html; charset=utf-8")
embedTmpl.Execute(w, embedData{
CastSrc: template.JS(src),
TermCols: a.TermCols,
TermRows: a.TermRows,
DarkID: darkID,
LightID: lightID,
AutoDarkBg: dark.Background,
AutoDarkFg: dark.Foreground,
AutoDarkRed: dark.Red,
AutoLightBg: light.Background,
AutoLightFg: light.Foreground,
AutoLightRed: light.Red,
})
})
}
// ---------------------------------------------------------------------------
// Router
// ---------------------------------------------------------------------------
func (s *Server) routes() http.Handler {
mux := http.NewServeMux()
// Root + login
mux.Handle("/", s.handleRoot())
mux.Handle("GET /login", s.handleLoginShow())
mux.Handle("POST /login", s.handleLoginSubmit())
mux.Handle("POST /reset-password", s.handlePasswordReset())
// Static assets (embedded)
serveStatic := func(data []byte, contentType string) http.HandlerFunc {
etag := fmt.Sprintf(`"%x"`, md5.Sum(data))
return func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("ETag", etag)
w.Header().Set("Cache-Control", "no-cache")
if r.Header.Get("If-None-Match") == etag {
w.WriteHeader(http.StatusNotModified)
return
}
w.Header().Set("Content-Type", contentType)
w.Write(data)
}
}
mux.HandleFunc("GET /static/asciinema-player.css", serveStatic(staticPlayerCSS, "text/css; charset=utf-8"))
mux.HandleFunc("GET /static/asciinema-player.min.js", serveStatic(staticPlayerJS, "application/javascript; charset=utf-8"))
mux.HandleFunc("GET /static/live-player.js", serveStatic(staticLivePlayerJS, "application/javascript; charset=utf-8"))
mux.HandleFunc("GET /static/vt_js.js", serveStatic(staticVtJS, "application/javascript; charset=utf-8"))
mux.HandleFunc("GET /static/vt_js_bg.wasm", serveStatic(staticVtWasm, "application/wasm"))
// Theme overview
mux.Handle("GET /themes", s.handleThemesOverview())
// Recording playback (browser + raw cast download)
mux.Handle("/a/", s.handleRecordingShow())
// Embed page for Mastodon/Twitter player cards
mux.Handle("GET /a/{token}/embed", s.handleRecordingEmbed())
// SVG preview image for og:image social previews
mux.Handle("GET /a/{token}/preview.svg", s.handleRecordingPreview())
mux.Handle("GET /a/{token}/preview.png", s.handleRecordingPreviewPNG())
// Recording management (browser/session auth)
mux.Handle("GET /user/my-recordings", s.handleUserRecordingsList())
mux.Handle("POST /recordings/{token}/delete", s.handleRecordingBrowserDelete())
mux.Handle("POST /recordings/{token}/rename", s.handleRecordingBrowserRename())
mux.Handle("POST /user/delete-account", s.handleUserDeleteAccount())
// CLI linking / registration
mux.Handle("GET /connect/{install_id}", s.handleConnectShow())
mux.Handle("POST /connect/{install_id}/register", s.handleConnectRegister())
mux.Handle("POST /connect/{install_id}/login", s.handleConnectLogin())
mux.Handle("POST /connect/{install_id}/link", s.handleConnectLink())
mux.Handle("POST /logout", s.handleLogout())
// API v1 — recordings
mux.Handle("POST /api/v1/recordings", s.handleRecordingCreate())
mux.Handle("PATCH /api/v1/recordings/{id}", s.handleRecordingUpdate())
mux.Handle("DELETE /api/v1/recordings/{id}", s.handleRecordingDelete())
// API v1 — live streams
mux.Handle("POST /api/v1/streams", s.handleStreamCreate())
mux.Handle("PATCH /api/v1/streams/{id}", s.handleStreamUpdate())
mux.Handle("GET /api/v1/user/streams", s.handleUserStreamsList())
mux.Handle("POST /streams/{public_token}/rename", s.handleStreamBrowserRename())
mux.Handle("POST /streams/{public_token}/delete", s.handleStreamBrowserDelete())
// Live stream WebSocket endpoints
mux.Handle("GET /ws/S/{producer_token}", s.handleProducerWS())
mux.Handle("GET /ws/s/{public_token}", s.handleConsumerWS())
// Live stream player page + snapshot
mux.Handle("GET /s/{public_token}/current.png", s.handleLiveStreamPreviewPNG())
mux.Handle("GET /s/{public_token}", s.handleLiveStreamShow())
// API legacy (CLI 2.x)
mux.Handle("POST /api/asciicasts", s.handleRecordingCreate())
// Wrap with no-cache middleware — static assets and cast files set their
// own Cache-Control via ETag handlers above; this covers everything else.
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Cache-Control", "no-cache")
mux.ServeHTTP(w, r)
})
}
// ---------------------------------------------------------------------------
// Main
// ---------------------------------------------------------------------------
func main() {
if len(os.Args) < 2 {
fmt.Fprintf(os.Stderr, `Usage: asciinema-server <command>
Commands:
serve Start the HTTP server
create-invite Create an invite token for a new user
delete-user Delete a user and all their recordings
reset-password Reset a user's password via a new invite token
alis-watch Watch a live stream, printing decoded ALiS events
Environment variables (for all commands):
DATABASE_PATH Path to the SQLite database (default: asciinema.db)
BASE_URL Public base URL, e.g. https://asciinema.example.com
Environment variables (for serve only):
PORT Port to listen on (default: 4000)
LISTEN_ADDR Full listen address, overrides PORT (default: 127.0.0.1:PORT)
APP_TITLE Title shown in the UI (default: asciinema)
UPLOAD_SIZE_LIMIT Max upload size in bytes (default: 10485760)
`)
os.Exit(1)
}
switch os.Args[1] {
case "serve":
runServer()
case "create-invite":
runCreateInvite(os.Args[2:])
case "delete-user":
runDeleteUser(os.Args[2:])
case "reset-password":
runResetPassword(os.Args[2:])
case "alis-watch":
runAlisWatch(os.Args[2:])
default:
fmt.Fprintf(os.Stderr, "unknown command: %s\n", os.Args[1])
os.Exit(1)
}
}
func runAlisWatch(args []string) {
if len(args) != 1 {
fmt.Fprintf(os.Stderr, "Usage: asciinema-server alis-watch <url>\n")
fmt.Fprintf(os.Stderr, " url: stream page URL, e.g. http://localhost:4000/s/<token>\n")
os.Exit(1)
}
rawURL := args[0]
u, err := url.Parse(rawURL)
if err != nil {
fmt.Fprintf(os.Stderr, "invalid URL: %v\n", err)
os.Exit(1)
}
// Rewrite /s/{token} → /ws/s/{token} and http → ws.
if strings.HasPrefix(u.Path, "/s/") {
u.Path = "/ws" + u.Path
}
switch u.Scheme {
case "http":
u.Scheme = "ws"
case "https":
u.Scheme = "wss"
}
wsURL := u.String()
// Connect — use the origin equal to the server itself to pass the
// x/net/websocket origin check on the server side (our handshake
// bypasses it, but the client also needs a valid origin header).
origin := u.Scheme + "://" + u.Host
cfg, err := websocket.NewConfig(wsURL, origin)
if err != nil {
fmt.Fprintf(os.Stderr, "websocket config error: %v\n", err)
os.Exit(1)
}
cfg.Protocol = []string{"v1.alis"}
ws, err := websocket.DialConfig(cfg)
if err != nil {
fmt.Fprintf(os.Stderr, "connect error: %v\n", err)
os.Exit(1)
}
defer ws.Close()
fmt.Printf("connected to %s\n\n", wsURL)
gotMagic := false
for {
var msg []byte
if err := websocket.Message.Receive(ws, &msg); err != nil {
fmt.Printf("[disconnected: %v]\n", err)
return
}
// Magic header
if !gotMagic {
if len(msg) == 5 && string(msg) == "ALiS\x01" {
gotMagic = true
fmt.Println("[magic] ALiS v1")
continue
}
fmt.Printf("[error] expected magic, got %d bytes\n", len(msg))
return
}
ev, ok := parseALiSMessage(msg)
if !ok {
fmt.Printf("[unknown] %d bytes: %x\n", len(msg), msg)
continue
}
switch ev.kind {
case "init":
fmt.Printf("[init] id=%-6d time=%-10s cols=%-4d rows=%-4d data=%d bytes\n",
ev.lastID,
formatMicros(ev.time),
ev.cols, ev.rows,
len(ev.initData),
)
case "output":
fmt.Printf("[output] id=%-6d rel=%-10s %s\n",
ev.id, formatMicros(ev.time), formatALiSData(ev.data))
case "input":
fmt.Printf("[input] id=%-6d rel=%-10s %s\n",
ev.id, formatMicros(ev.time), formatALiSData(ev.data))
case "resize":
fmt.Printf("[resize] id=%-6d rel=%-10s cols=%d rows=%d\n",
ev.id, formatMicros(ev.time), ev.cols, ev.rows)
case "marker":
fmt.Printf("[marker] id=%-6d rel=%-10s %s\n",
ev.id, formatMicros(ev.time), formatALiSData(ev.data))
case "exit":
fmt.Printf("[exit] id=%-6d rel=%-10s status=%d\n",
ev.id, formatMicros(ev.time), ev.status)
case "eot":
fmt.Printf("[eot] rel=%s\n", formatMicros(ev.time))
return
}
}
}
// formatMicros formats a microsecond duration as a human-readable string.
func formatMicros(micros uint64) string {
d := time.Duration(micros) * time.Microsecond
if d < time.Millisecond {
return fmt.Sprintf("%dµs", micros)
}
if d < time.Second {
return fmt.Sprintf("%.1fms", float64(micros)/1000)
}
return fmt.Sprintf("%.3fs", float64(micros)/1_000_000)
}
// ANSI color helpers used by formatALiSData.
const (
ansiReset = "\x1b[0m"
ansiDim = "\x1b[2m"
ansiYellow = "\x1b[33m"
ansiBold = "\x1b[1m"
)
// sgrColor maps SGR color indices to ANSI escape codes for inline colorization.
var sgrColorNames = [16]string{
"black", "red", "green", "yellow", "blue", "magenta", "cyan", "white",
"bright-black", "bright-red", "bright-green", "bright-yellow",
"bright-blue", "bright-magenta", "bright-cyan", "bright-white",
}
var sgrColorAnsi = [16]string{
"\x1b[30m", "\x1b[31m", "\x1b[32m", "\x1b[33m", "\x1b[34m", "\x1b[35m", "\x1b[36m", "\x1b[37m",
"\x1b[90m", "\x1b[91m", "\x1b[92m", "\x1b[93m", "\x1b[94m", "\x1b[95m", "\x1b[96m", "\x1b[97m",
}
// seq emits a named escape sequence token in yellow.
func seq(name string) string {
return ansiYellow + "⟨" + name + "⟩" + ansiReset
}
// ctrl emits a C0 control token in dim.
func ctrl(name string) string {
return ansiDim + "⟨" + name + "⟩" + ansiReset
}
// parseSGR parses CSI SGR parameters and returns a human-readable description
// with inline colors for fg/bg values.
func parseSGR(params []int) string {
if len(params) == 0 || (len(params) == 1 && params[0] == 0) {
return "SGR reset"
}
var parts []string
i := 0
for i < len(params) {
p := params[i]
switch {
case p == 0:
parts = append(parts, "reset")
case p == 1:
parts = append(parts, ansiBold+"bold"+ansiReset+ansiYellow)
case p == 2:
parts = append(parts, "dim")
case p == 3:
parts = append(parts, "italic")
case p == 4:
parts = append(parts, "ul")
case p == 5:
parts = append(parts, "blink")
case p == 7:
parts = append(parts, "inv")
case p == 8:
parts = append(parts, "invis")
case p == 9:
parts = append(parts, "strike")
case p == 22:
parts = append(parts, "no-bold")
case p == 23:
parts = append(parts, "no-italic")
case p == 24:
parts = append(parts, "no-ul")
case p == 27:
parts = append(parts, "no-inv")
case p >= 30 && p <= 37:
idx := p - 30
parts = append(parts, sgrColorAnsi[idx]+"fg="+sgrColorNames[idx]+ansiReset+ansiYellow)
case p == 38 && i+2 < len(params) && params[i+1] == 5:
idx := params[i+2]
name := fmt.Sprintf("fg=color%d", idx)
if idx < 16 {
name = sgrColorAnsi[idx] + "fg=" + sgrColorNames[idx] + ansiReset + ansiYellow
}
parts = append(parts, name)
i += 2
case p == 38 && i+4 < len(params) && params[i+1] == 2:
parts = append(parts, fmt.Sprintf("fg=rgb(%d,%d,%d)", params[i+2], params[i+3], params[i+4]))
i += 4
case p == 39:
parts = append(parts, "fg=default")
case p >= 40 && p <= 47:
idx := p - 40
parts = append(parts, sgrColorAnsi[idx]+"bg="+sgrColorNames[idx]+ansiReset+ansiYellow)
case p == 48 && i+2 < len(params) && params[i+1] == 5:
idx := params[i+2]
name := fmt.Sprintf("bg=color%d", idx)
if idx < 16 {
name = sgrColorAnsi[idx] + "bg=" + sgrColorNames[idx] + ansiReset + ansiYellow
}
parts = append(parts, name)
i += 2
case p == 48 && i+4 < len(params) && params[i+1] == 2:
parts = append(parts, fmt.Sprintf("bg=rgb(%d,%d,%d)", params[i+2], params[i+3], params[i+4]))
i += 4
case p == 49:
parts = append(parts, "bg=default")
case p >= 90 && p <= 97:
idx := p - 90 + 8
parts = append(parts, sgrColorAnsi[idx]+"fg="+sgrColorNames[idx]+ansiReset+ansiYellow)
case p >= 100 && p <= 107:
idx := p - 100 + 8
parts = append(parts, sgrColorAnsi[idx]+"bg="+sgrColorNames[idx]+ansiReset+ansiYellow)
default:
parts = append(parts, fmt.Sprintf("%d", p))
}
i++
}
result := "SGR"
if len(parts) > 0 {
result += " " + strings.Join(parts, " ")
}
return result
}
// parseCSIParams parses semicolon-separated integer params from a CSI sequence.
func parseCSIParams(s string) []int {
if s == "" {
return []int{0}
}
var result []int
for _, part := range strings.Split(s, ";") {
part = strings.TrimSpace(part)
if part == "" {
result = append(result, 0)
continue
}
n, err := strconv.Atoi(part)
if err != nil {
result = append(result, 0)
} else {
result = append(result, n)
}
}
return result
}
// formatALiSData formats a terminal data string with named escape sequences.
// Printable text is shown as-is; escape sequences are shown as ⟨NAME args⟩ in
// yellow; C0 controls as dim ⟨NAME⟩. Long output is truncated.
func formatALiSData(s string) string {
const maxVisible = 120
var out strings.Builder
visible := 0 // count of visible (non-escape) runes for truncation
i := 0
runes := []rune(s)
n := len(runes)
for i < n && visible < maxVisible {
r := runes[i]
// C0 controls
switch r {
case '\r':
out.WriteString(ctrl("CR"))
i++
continue
case '\n':
out.WriteString(ctrl("LF"))
i++
continue
case '\t':
out.WriteString(ctrl("HT"))
i++
continue
case '\x07':
out.WriteString(ctrl("BEL"))
i++
continue
case '\x08':
out.WriteString(ctrl("BS"))
i++
continue
case '\x0e':
out.WriteString(ctrl("SO"))
i++
continue
case '\x0f':
out.WriteString(ctrl("SI"))
i++
continue
}
// ESC sequences
if r == '\x1b' {
if i+1 >= n {
out.WriteString(seq("ESC"))
i++
continue
}
next := runes[i+1]
// ESC followed by a single char (not '[' or '(')
switch next {
case '7':
out.WriteString(seq("SC"))
i += 2
continue
case '8':
out.WriteString(seq("RC"))
i += 2
continue
case 'c':
out.WriteString(seq("RIS"))
i += 2
continue
case 'M':
out.WriteString(seq("RI"))
i += 2
continue
case '=':
out.WriteString(seq("DECKPAM"))
i += 2
continue
case '>':
out.WriteString(seq("DECKPNM"))
i += 2
continue
}
// ESC ( charset
if next == '(' && i+2 < n {
ch := runes[i+2]
switch ch {
case 'B':
out.WriteString(seq("CHARSET ascii"))
case '0':
out.WriteString(seq("CHARSET gfx"))
default:
out.WriteString(seq(fmt.Sprintf("CHARSET %c", ch)))
}
i += 3
continue
}
// CSI — ESC [
if next == '[' {
// Collect until final byte (0x40–0x7e)
j := i + 2
for j < n && (runes[j] < 0x40 || runes[j] > 0x7e) {
j++
}
if j >= n {
out.WriteString(ansiDim + "⟨ESC[…⟩" + ansiReset)
i = j
continue
}
params := string(runes[i+2 : j])
final := runes[j]
i = j + 1
// Private sequences ESC [ ? ...
isPrivate := strings.HasPrefix(params, "?")
privParams := strings.TrimPrefix(params, "?")
switch {
case final == 'm':
nums := parseCSIParams(params)
out.WriteString(ansiYellow + "⟨" + parseSGR(nums) + "⟩" + ansiReset)
case final == 'H' || final == 'f':
ps := parseCSIParams(params)
row, col := 1, 1
if len(ps) >= 1 && ps[0] != 0 {
row = ps[0]
}
if len(ps) >= 2 && ps[1] != 0 {
col = ps[1]
}
out.WriteString(seq(fmt.Sprintf("CUP %d,%d", row, col)))
case final == 'A':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("CUU %d", max1(ps))))
case final == 'B':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("CUD %d", max1(ps))))
case final == 'C':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("CUF %d", max1(ps))))
case final == 'D':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("CUB %d", max1(ps))))
case final == 'E':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("CNL %d", max1(ps))))
case final == 'F':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("CPL %d", max1(ps))))
case final == 'G':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("CHA %d", max1(ps))))
case final == 'd':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("VPA %d", max1(ps))))
case final == 'J':
ps := parseCSIParams(params)
names := []string{"below", "above", "all", "saved"}
p := 0
if len(ps) > 0 {
p = ps[0]
}
name := fmt.Sprintf("%d", p)
if p < len(names) {
name = names[p]
}
out.WriteString(seq("ED " + name))
case final == 'K':
ps := parseCSIParams(params)
names := []string{"right", "left", "all"}
p := 0
if len(ps) > 0 {
p = ps[0]
}
name := fmt.Sprintf("%d", p)
if p < len(names) {
name = names[p]
}
out.WriteString(seq("EL " + name))
case final == 'L':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("IL %d", max1(ps))))
case final == 'M':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("DL %d", max1(ps))))
case final == 'P':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("DCH %d", max1(ps))))
case final == '@':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("ICH %d", max1(ps))))
case final == 'X':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("ECH %d", max1(ps))))
case final == 'S':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("SU %d", max1(ps))))
case final == 'T':
ps := parseCSIParams(params)
out.WriteString(seq(fmt.Sprintf("SD %d", max1(ps))))
case final == 'r':
ps := parseCSIParams(params)
top, bot := 1, 1
if len(ps) >= 1 {
top = ps[0]
}
if len(ps) >= 2 {
bot = ps[1]
}
out.WriteString(seq(fmt.Sprintf("DECSTBM %d,%d", top, bot)))
case final == 's':
out.WriteString(seq("SC"))
case final == 'u':
out.WriteString(seq("RC"))
case final == 'h' && isPrivate:
out.WriteString(seq(decprivName(privParams, true)))
case final == 'l' && isPrivate:
out.WriteString(seq(decprivName(privParams, false)))
case final == 'n' && params == "6":
out.WriteString(seq("CPR"))
default:
out.WriteString(ansiDim + "⟨CSI " + params + string(final) + "⟩" + ansiReset)
}
visible += 4 // count sequence as a small fixed cost
continue
}
// OSC — ESC ]
if next == ']' {
j := i + 2
for j < n {
if runes[j] == '\x07' {
j++
break
}
if runes[j] == '\x1b' && j+1 < n && runes[j+1] == '\\' {
j += 2
break
}
j++
}
inner := string(runes[i+2 : j])
if len(inner) > 20 {
inner = inner[:20] + "…"
}
out.WriteString(seq("OSC " + inner))
i = j
visible += 4
continue
}
// Unknown ESC x
out.WriteString(ansiDim + fmt.Sprintf("⟨ESC %c⟩", next) + ansiReset)
i += 2
continue
}
// Printable
if r >= 0x20 && r != 0x7f {
out.WriteRune(r)
visible++
} else {
// Other non-printable
out.WriteString(ansiDim + fmt.Sprintf("⟨%02X⟩", r) + ansiReset)
}
i++
}
if i < n {
remaining := len(string(runes[i:]))
out.WriteString(ansiDim + fmt.Sprintf(" … (+%d bytes)", remaining) + ansiReset)
}
return out.String()
}
// decprivName returns a human-readable name for a DEC private mode.
func decprivName(param string, set bool) string {
action := map[bool]string{true: "show", false: "hide"}
on := map[bool]string{true: "on", false: "off"}
enter := map[bool]string{true: "enter", false: "exit"}
switch param {
case "1":
return "DECCKM " + on[set]
case "3":
return "DECCOLM " + on[set]
case "6":
return "DECOM " + on[set]
case "7":
return "DECAWM " + on[set]
case "25":
return "DECTCEM " + action[set]
case "1000":
return "MOUSE " + on[set]
case "1002":
return "MOUSE-BTN " + on[set]
case "1006":
return "MOUSE-SGR " + on[set]
case "1049":
return "ALTBUF " + enter[set]
case "2004":
return "BPASTE " + on[set]
case "2026":
return "SYNC " + on[set]
default:
return fmt.Sprintf("DEC?%s %s", param, on[set])
}
}
// max1 returns the first param or 1 if empty/zero.
func max1(ps []int) int {
if len(ps) == 0 || ps[0] == 0 {
return 1
}
return ps[0]
}
// openSubcommandDB opens the SQLite database for a CLI subcommand.
// On error it prints to stderr and calls os.Exit(1).
func openSubcommandDB() (*sql.DB, Config) {
cfg := loadConfig()
db, err := sql.Open("sqlite", sqliteDSN(cfg.DatabasePath))
if err != nil {
fmt.Fprintf(os.Stderr, "open db: %v\n", err)
os.Exit(1)
}
if _, err := db.Exec(schema); err != nil {
fmt.Fprintf(os.Stderr, "schema: %v\n", err)
os.Exit(1)
}
return db, cfg
}
// mustLookupUserID looks up a user by username, printing an error and
// calling os.Exit(1) if not found or on DB error.
func mustLookupUserID(db *sql.DB, username string) int64 {
var userID int64
err := db.QueryRow(`SELECT id FROM users WHERE username = ?`, username).Scan(&userID)
if errors.Is(err, sql.ErrNoRows) {
fmt.Fprintf(os.Stderr, "user %q not found\n", username)
os.Exit(1)
}
if err != nil {
fmt.Fprintf(os.Stderr, "query: %v\n", err)
os.Exit(1)
}
return userID
}
// mustExec executes a DB statement, printing an error and calling os.Exit(1) on failure.
func mustExec(db *sql.DB, label, query string, args ...any) {
if _, err := db.Exec(query, args...); err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", label, err)
os.Exit(1)
}
}
func runCreateInvite(args []string) {
fs := flag.NewFlagSet("create-invite", flag.ExitOnError)
username := fs.String("username", "", "Username to reserve for this invite (required)")
fs.Parse(args)
if *username == "" {
fmt.Fprintln(os.Stderr, "Usage: asciinema-server create-invite -username NAME")
os.Exit(1)
}
db, cfg := openSubcommandDB()
defer db.Close()
token := randomToken(24)
if err := createInvite(db, *username, token); err != nil {
fmt.Fprintf(os.Stderr, "create invite: %v\n", err)
os.Exit(1)
}
fmt.Printf("Invite token for %s: %s\n", *username, token)
fmt.Printf("Registration URL: %s/connect/<install_id>\n", cfg.BaseURL)
fmt.Printf("(User visits that URL after running 'asciinema upload')\n")
}
func runDeleteUser(args []string) {
fs := flag.NewFlagSet("delete-user", flag.ExitOnError)
username := fs.String("username", "", "Username to delete (required)")
fs.Parse(args)
if *username == "" {
fmt.Fprintln(os.Stderr, "Usage: asciinema-server delete-user -username NAME")
os.Exit(1)
}
db, _ := openSubcommandDB()
defer db.Close()
userID := mustLookupUserID(db, *username)
count, err := deleteUserAndEverything(db, userID)
if err != nil {
fmt.Fprintf(os.Stderr, "delete: %v\n", err)
os.Exit(1)
}
fmt.Printf("Deleted user %s and %d recording(s).\n", *username, count)
}
func runResetPassword(args []string) {
fs := flag.NewFlagSet("reset-password", flag.ExitOnError)
username := fs.String("username", "", "Username to reset password for (required)")
fs.Parse(args)
if *username == "" {
fmt.Fprintln(os.Stderr, "Usage: asciinema-server reset-password -username NAME")
os.Exit(1)
}
db, _ := openSubcommandDB()
defer db.Close()
userID := mustLookupUserID(db, *username)
// Remove all invites for this username (used or not) so we can create a fresh one
mustExec(db, "delete old invite", `DELETE FROM invites WHERE username = ?`, *username)
// Clear the password hash so old password no longer works
mustExec(db, "clear password", `UPDATE users SET password_hash = NULL WHERE id = ?`, userID)
// Create a new invite token
token := randomToken(24)
if err := createInvite(db, *username, token); err != nil {
fmt.Fprintf(os.Stderr, "create invite: %v\n", err)
os.Exit(1)
}
fmt.Printf("Password reset token for %s: %s\n", *username, token)
fmt.Printf("User visits /connect/<install_id> and uses this token to set a new password.\n")
}
func runServer() {
cfg := loadConfig()
srv, err := openServer(cfg)
if err != nil {
log.Fatalf("open server: %v", err)
}
defer srv.close()
port := getenv("PORT", "4000")
addr := getenv("LISTEN_ADDR", "127.0.0.1:"+port)
log.Printf("asciinema-server listening on %s (base URL: %s)", addr, cfg.BaseURL)
if err := http.ListenAndServe(addr, srv.routes()); err != nil {
log.Fatal(err)
}
}
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