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|
package main
import (
"database/sql"
_ "embed"
"fmt"
"html/template"
"log"
"net/http"
"net/url"
"regexp"
"slices"
"sort"
"strconv"
"strings"
"time"
"codeberg.org/Profpatsch/Profpatsch/users/Profpatsch/mailtext"
)
// ============================================================================
// Forge notification templates
// ============================================================================
//go:embed templates/forge.html
var forgeTmplSrc string
//go:embed templates/forge_repo.html
var forgeRepoTmplSrc string
var (
forgeTmpl = template.Must(template.New("forge").Funcs(accountTmplFuncs).Parse(forgeTmplSrc))
forgeRepoTmpl = template.Must(template.New("forgerepo").Funcs(accountTmplFuncs).Parse(forgeRepoTmplSrc))
)
// ============================================================================
// Forge data types
// ============================================================================
// forgePageData is passed to templates/forge.html. The template took a bare
// slice until the text-view link needed a URL alongside it.
type forgePageData struct {
Repos []forgeRepoEntry
LLMViewURL string
}
// forgeRepoPageData is passed to templates/forge_repo.html.
type forgeRepoPageData struct {
Repo string
// RepoEscaped is the same name path-escaped, for the alternate link, which
// names the route rather than the current URL and so cannot reuse
// LLMViewURL.
RepoEscaped string
Threads []forgeThread
LLMViewURL string
}
// forgeRepoEntry is one row in the forge repo listing.
type forgeRepoEntry struct {
Repo string // e.g. "NixOS/nixpkgs"
RepoEscaped string // url.PathEscape(Repo)
LastSeen time.Time
Count int
}
// forgeMsgRow is one message in a forge repo view.
type forgeMsgRow struct {
ID int64
Subject string
Date time.Time
Reason string // x-github-reason value, e.g. "pull", "issue"
Sender string // x-github-sender value, e.g. "octocat"
IsNew bool // true if sender was inactive in this repo for >90 days before this message
GapToPrev string // human-readable gap since sender's last message, e.g. "1y5m23d", "" if first
// SizeHint annotates what reading this message costs, like " (~4K)", or ""
// when the size is not known. Only the text rendering prints it; the HTML
// view frames bodies itself and never asks the reader to decide.
SizeHint string
}
// formatGap formats a duration as a compact human-readable string like "1y5m23d".
func formatGap(d time.Duration) string {
if d <= 0 {
return ""
}
totalDays := int(d.Hours() / 24)
years := totalDays / 365
days := totalDays % 365
months := days / 30
days = days % 30
s := ""
if years > 0 {
s += fmt.Sprintf("%dy", years)
}
if months > 0 {
s += fmt.Sprintf("%dm", months)
}
if days > 0 || s == "" {
s += fmt.Sprintf("%dd", days)
}
return s
}
// involvementRank maps x-github-reason values to a priority score.
// Higher = more directly involved. A thread displays the highest rank any of
// its messages carries, so what this orders is which one line of a thread's
// summary is worth reading first.
//
// The ranking is by what the message asks of the reader, not by how close to
// the thread they are. A review request and a mention are both somebody waiting
// on an answer; your_activity and ci_activity are reports about things that
// already happened, and rank below subscribed rather than above it despite
// naming the reader directly — a notification that cannot be acted on should
// not outrank one that can.
//
// Every value the forges emit is listed, including the ones that rank zero.
// Absence and a rank of zero are the same number in Go, so an unlisted value is
// indistinguishable from a deliberate bottom rank, and the map is the only
// place that distinction can be recorded.
var involvementRank = map[string]int{
// Somebody is waiting on the reader.
"security_alert": 8, // a vulnerability in a repo the reader can fix
"author": 7, // the reader opened the thread
"assign": 6,
"review_requested": 5,
"mention": 4,
"team_mention": 4, // as above, addressed to a team the reader is in
"comment": 3, // the reader has spoken in the thread before
"manual": 2, // the reader subscribed to this thread specifically
"state_change": 1,
// Merely watching: the notification reports what somebody else did.
"subscribed": 0,
"pull": 0, // Forgejo/Gitea say what the thread is, not why it arrived
"issue": 0,
"push": 0,
// Reports about the reader that ask nothing of them.
"your_activity": 0,
"ci_activity": 0,
}
// forgeThread groups messages belonging to the same issue/PR.
type forgeThread struct {
Num int // issue/PR number, 0 if unknown
Title string // clean title, or first subject if unparseable
URL string // link to the issue/PR on the forge, e.g. https://github.com/NixOS/nixpkgs/issues/123
LastDate time.Time
Involvement string // highest x-github-reason across all messages
Participants []string // unique x-github-sender values, in order of first appearance
NewParticipants map[string]bool // senders who have at least one "new" message in this thread
Messages []forgeMsgRow
// Count is how many messages the thread holds, which is not len(Messages)
// once the text rendering has capped the list; Omitted is the difference.
// Both are zero-cost in the HTML view, which shows every message.
Count int
Omitted int
}
// capMessages trims each thread to its n most recent messages, recording how
// many were left out so the rendering can say so.
//
// A thread is unbounded in a way the thread count is not: one ghc-proposals
// discussion in this archive is 473 messages under a single subject, so paging
// threads alone would still hand a client a page of thousands of lines. Paging
// the messages *within* a thread instead would be worse than a cap: the entries
// are notifications about one discussion, and a reader who wants all of them
// wants the discussion, which is on the forge and is what the thread URL is
// for.
//
// The threads are modified in place, on the already-paged slice, so this costs
// nothing on the threads nobody asked for.
func capMessages(threads []forgeThread, n int) {
for i := range threads {
t := &threads[i]
t.Count = len(t.Messages)
if n >= 0 && t.Count > n {
t.Messages = t.Messages[:n]
t.Omitted = t.Count - n
}
}
}
// forgeThreadURL constructs the URL for an issue/PR given the forge host,
// repo (e.g. "NixOS/nixpkgs") and number. GitHub redirects /issues/N to
// /pull/N if needed, so we always use /issues/.
// Codeberg/Forgejo use /issues/ for both.
func forgeThreadURL(host, repo string, num int) string {
if num == 0 {
return ""
}
switch host {
case "github.com":
return fmt.Sprintf("https://github.com/%s/issues/%d", repo, num)
case "codeberg.org":
return fmt.Sprintf("https://codeberg.org/%s/issues/%d", repo, num)
default:
// Generic Gitea/Forgejo: host is the full domain.
return fmt.Sprintf("https://%s/%s/issues/%d", host, repo, num)
}
}
// forgeHeaderName is the header used to identify forge notifications.
// Present on messages from GitHub, Codeberg (Forgejo/Gitea) and compatible
// forges. Used to exclude forge messages from the contacts view.
const forgeHeaderName = "x-github-sender"
// forgeSubjectRe matches subjects like:
//
// [org/repo] Some title (PR #123)
// Re: [org/repo] Some title (Issue #456)
var forgeSubjectRe = regexp.MustCompile(`(?:Re: )?\[[^\]]+\] (.+?)\s*\([^)]*#(\d+)\)\s*$`)
// parseForgeSubject extracts (threadTitle, threadNum) from a forge notification
// subject line. Returns ("", 0) if the subject doesn't match.
func parseForgeSubject(subject string) (title string, num int) {
m := forgeSubjectRe.FindStringSubmatch(subject)
if m == nil {
return "", 0
}
n := 0
fmt.Sscanf(m[2], "%d", &n)
return m[1], n
}
// ============================================================================
// Forge HTTP handlers
// ============================================================================
func (s *server) handleForge(w http.ResponseWriter, r *http.Request) {
rows, err := s.db.Read.Query(`
SELECT
TRIM(SUBSTR(mh.value, 1,
CASE WHEN INSTR(mh.value, '<') > 0
THEN INSTR(mh.value, '<') - 1
ELSE LENGTH(mh.value) + 1 END
)) AS repo,
COUNT(DISTINCT mh.message_id) AS msg_count,
MAX(m.date) AS last_date
FROM message_headers mh
JOIN messages m ON m.id = mh.message_id
WHERE mh.name = 'list-id'
AND mh.message_id IN (
SELECT message_id FROM message_headers WHERE name = ?
)
GROUP BY repo
ORDER BY last_date DESC
`, forgeHeaderName)
if err != nil {
http.Error(w, fmt.Sprintf("db error: %v", err), http.StatusInternalServerError)
return
}
defer rows.Close()
var repos []forgeRepoEntry
for rows.Next() {
var e forgeRepoEntry
var unixDate int64
if err := rows.Scan(&e.Repo, &e.Count, &unixDate); err != nil {
http.Error(w, fmt.Sprintf("scan: %v", err), http.StatusInternalServerError)
return
}
e.Repo = strings.TrimSpace(e.Repo)
e.RepoEscaped = url.PathEscape(e.Repo)
e.LastSeen = time.Unix(unixDate, 0)
repos = append(repos, e)
}
if err := rows.Err(); err != nil {
http.Error(w, fmt.Sprintf("rows: %v", err), http.StatusInternalServerError)
return
}
if mailtext.WantsLLM(r) {
// A repo listing is one line and one link per repo, and there are
// hundreds; page it like every other listing so that a single request
// stays a page rather than a file.
p := mailtext.ParsePaging(r, len(repos), mailtext.DefaultLimit)
writeLLM(w, r, forgeLLMTmpl, forgeLLMData{
Repos: mailtext.SlicePage(repos, p),
Paging: p,
HTMLViewURL: mailtext.HTMLViewURL(r),
})
return
}
mailtext.SetAlternate(w, r.URL.Path)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
if err := forgeTmpl.Execute(w, forgePageData{
Repos: repos,
LLMViewURL: mailtext.LLMViewURL(r),
}); err != nil {
log.Printf("forge template: %v", err)
}
}
func (s *server) handleForgeRepo(w http.ResponseWriter, r *http.Request) {
repo := strings.TrimSpace(r.PathValue("repo"))
if repo == "" {
// A bare /forge/ is a truncated URL rather than a request for a
// repository named "", and the listing is where it was heading.
http.Redirect(w, r, "/forge", http.StatusFound)
return
}
// Extract the forge host from the list-id value, e.g. "github.com" from
// "nixpkgs.NixOS.github.com". The list-id looks like "org/repo <sub.host>".
forgeHost := ""
{
var listID string
_ = s.db.Read.QueryRow(`
SELECT value FROM message_headers
WHERE name = 'list-id'
AND TRIM(SUBSTR(value, 1,
CASE WHEN INSTR(value, '<') > 0
THEN INSTR(value, '<') - 1
ELSE LENGTH(value) + 1 END
)) = ?
LIMIT 1`, repo).Scan(&listID)
// listID looks like "NixOS/nixpkgs <nixpkgs.NixOS.github.com>"
// Extract the host inside < >, then take the last two dot-separated parts.
if i := strings.Index(listID, "<"); i >= 0 {
sub := strings.TrimRight(listID[i+1:], ">")
parts := strings.Split(sub, ".")
if len(parts) >= 2 {
forgeHost = parts[len(parts)-2] + "." + parts[len(parts)-1]
}
}
}
// Find all message IDs for this repo via list-id, joined with sender/reason.
//
// The size columns come along on the same row, so the text rendering can
// annotate what following a link costs without a second query; see
// mailtext.SizeHint.
rows, err := s.db.Read.Query(`
SELECT
m.id, m.subject, m.date,
(SELECT value FROM message_headers
WHERE message_id = m.id AND name = 'x-github-reason' LIMIT 1) AS reason,
(SELECT value FROM message_headers
WHERE message_id = m.id AND name = ? LIMIT 1) AS sender,
LENGTH(m.display_part), m.rfc822_size
FROM messages m
JOIN message_headers mh_list ON mh_list.message_id = m.id
WHERE mh_list.name = 'list-id'
AND TRIM(SUBSTR(mh_list.value, 1,
CASE WHEN INSTR(mh_list.value, '<') > 0
THEN INSTR(mh_list.value, '<') - 1
ELSE LENGTH(mh_list.value) + 1 END
)) = ?
ORDER BY m.date DESC
`, forgeHeaderName, repo)
if err != nil {
http.Error(w, fmt.Sprintf("db error: %v", err), http.StatusInternalServerError)
return
}
defer rows.Close()
var msgs []forgeMsgRow
for rows.Next() {
var msg forgeMsgRow
var unixDate int64
var reason, sender sql.NullString
var partLen, rawSize sql.NullInt64
if err := rows.Scan(&msg.ID, &msg.Subject, &unixDate, &reason, &sender,
&partLen, &rawSize); err != nil {
http.Error(w, fmt.Sprintf("scan: %v", err), http.StatusInternalServerError)
return
}
msg.Date = time.Unix(unixDate, 0)
msg.Reason = reason.String
msg.Sender = sender.String
msg.SizeHint = mailtext.SizeHint(partLen.Int64, rawSize.Int64)
msgs = append(msgs, msg)
}
if err := rows.Err(); err != nil {
http.Error(w, fmt.Sprintf("rows: %v", err), http.StatusInternalServerError)
return
}
// A repo no message names is not a repo, and answers 404 rather than an
// empty listing — the same rule /contact/{addr} follows, for the same
// reason: this page mints links out of the name it was handed, so rendering
// one for a repo nothing was sent from turns a typed URL into hyperlinks
// that appear to come from mailweb.
if len(msgs) == 0 {
http.NotFound(w, r)
return
}
// Group into threads by issue/PR number.
// threadOrder tracks insertion order so we can sort threads by num DESC.
type threadKey struct {
num int
title string
}
byNum := make(map[int]*forgeThread)
var threadNums []int
for _, msg := range msgs {
title, num := parseForgeSubject(msg.Subject)
t, ok := byNum[num]
if !ok {
if title == "" {
title = msg.Subject
}
t = &forgeThread{
Num: num,
Title: title,
URL: forgeThreadURL(forgeHost, repo, num),
}
byNum[num] = t
threadNums = append(threadNums, num)
}
t.Messages = append(t.Messages, msg)
if msg.Date.After(t.LastDate) {
t.LastDate = msg.Date
}
// Track max involvement level across messages.
if involvementRank[msg.Reason] > involvementRank[t.Involvement] {
t.Involvement = msg.Reason
}
// Track unique participants in order of first appearance.
if msg.Sender != "" {
found := slices.Contains(t.Participants, msg.Sender)
if !found {
t.Participants = append(t.Participants, msg.Sender)
}
}
}
// Sort threads by most recent message first.
sort.Slice(threadNums, func(i, j int) bool {
return byNum[threadNums[i]].LastDate.After(byNum[threadNums[j]].LastDate)
})
threads := make([]forgeThread, 0, len(threadNums))
for _, num := range threadNums {
t := byNum[num]
// Within each thread, sort reverse chronologically (most recent first).
sort.Slice(t.Messages, func(i, j int) bool {
return t.Messages[i].Date.After(t.Messages[j].Date)
})
threads = append(threads, *t)
}
// Mark which messages are from a "new" sender — someone who hadn't posted
// in this repo for >90 days before this specific message.
newMsgs, err := markNewMessages(s.db.Read, repo, 90*24*time.Hour)
if err != nil {
log.Printf("forge: markNewMessages: %v", err)
// Non-fatal — render without new-sender highlighting.
}
for i := range threads {
threads[i].NewParticipants = make(map[string]bool)
for j := range threads[i].Messages {
a := newMsgs[threads[i].Messages[j].ID]
threads[i].Messages[j].IsNew = a.isNew
threads[i].Messages[j].GapToPrev = a.gap
if a.isNew && threads[i].Messages[j].Sender != "" {
threads[i].NewParticipants[threads[i].Messages[j].Sender] = true
}
}
}
if mailtext.WantsLLM(r) {
// Bounded in both dimensions: threads per page, and messages per
// thread. Either alone leaves a page unbounded — see capMessages.
p := mailtext.ParsePaging(r, len(threads), mailtext.DefaultLimit)
paged := mailtext.SlicePage(threads, p)
limit := forgeMsgLimit(r)
capMessages(paged, limit)
writeLLM(w, r, forgeRepoLLMTmpl, forgeRepoLLMData{
Repo: repo,
Threads: paged,
MsgLimit: limit,
Paging: p,
HTMLViewURL: mailtext.HTMLViewURL(r),
})
return
}
mailtext.SetAlternate(w, r.URL.Path)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
if err := forgeRepoTmpl.Execute(w, forgeRepoPageData{
Repo: repo,
RepoEscaped: url.PathEscape(repo),
Threads: threads,
LLMViewURL: mailtext.LLMViewURL(r),
}); err != nil {
log.Printf("forge repo template: %v", err)
}
}
// defaultForgeMsgLimit is how many of a thread's messages the text rendering
// lists. Five is enough to see who is currently talking and how recently,
// which is what a thread summary is for; the discussion itself lives on the
// forge, one link away.
const defaultForgeMsgLimit = 5
// forgeMsgLimit reads ?msgs=N, the per-thread message cap. A negative value
// means no cap, so that a reader who does want a whole thread can ask for it
// without guessing a number larger than the biggest thread.
func forgeMsgLimit(r *http.Request) int {
v := r.URL.Query().Get("msgs")
if v == "" {
return defaultForgeMsgLimit
}
n, err := strconv.Atoi(v)
if err != nil {
return defaultForgeMsgLimit
}
if n < 0 {
return -1
}
return n
}
type msgActivity struct {
isNew bool
gap string // formatted gap to sender's previous message, "" if first
}
// markNewMessages uses a LAG window function to find, for each message in the
// repo, the sender's previous message date in the same repo. If the gap is
// greater than threshold (or they have no prior message), the message is
// marked as "new". The gap to the previous message is also returned.
func markNewMessages(db *sql.DB, repo string, threshold time.Duration) (map[int64]msgActivity, error) {
const repoExpr = `TRIM(SUBSTR(mh_list.value, 1,
CASE WHEN INSTR(mh_list.value, '<') > 0
THEN INSTR(mh_list.value, '<') - 1
ELSE LENGTH(mh_list.value) + 1 END
))`
rows, err := db.Query(`
SELECT id, date, prev_date FROM (
SELECT
m.id,
m.date,
LAG(m.date) OVER (
PARTITION BY mh_sender.value
ORDER BY m.date
) AS prev_date
FROM messages m
JOIN message_headers mh_sender ON mh_sender.message_id = m.id
JOIN message_headers mh_list ON mh_list.message_id = m.id
WHERE mh_sender.name = 'x-github-sender'
AND mh_list.name = 'list-id'
AND `+repoExpr+` = ?
)`, repo)
if err != nil {
return nil, fmt.Errorf("query: %w", err)
}
defer rows.Close()
result := make(map[int64]msgActivity)
for rows.Next() {
var id, date int64
var prevDate sql.NullInt64
if err := rows.Scan(&id, &date, &prevDate); err != nil {
return nil, fmt.Errorf("scan: %w", err)
}
var gap string
isNew := !prevDate.Valid
if prevDate.Valid {
diff := time.Duration(date-prevDate.Int64) * time.Second
gap = formatGap(diff)
isNew = diff > threshold
}
result[id] = msgActivity{isNew: isNew, gap: gap}
}
return result, rows.Err()
}
|