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package server
import (
"fmt"
"html/template"
"io/fs"
"net/http"
"rss-kakapo/dal"
"rss-kakapo/shared"
"rss-kakapo/texts"
"rss-kakapo/www"
"strconv"
"strings"
"time"
)
const feedsPerPage = 200
const postsPerPage = 100
var months = []string{
"January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December",
}
type webHandlerGroup struct {
cfg *shared.Config
logger shared.ILogger
repo dal.IRepo
txt texts.ITexts
idb shared.IdBuilder
version string
timestamp string
pageTemplates map[string]*template.Template
}
func NewWebHandlerGroup(
cfg *shared.Config,
logger shared.ILogger,
repo dal.IRepo,
txt texts.ITexts,
) IHandlerGroup {
res := webHandlerGroup{
cfg: cfg,
logger: logger,
repo: repo,
txt: txt,
idb: shared.IdBuilder{Host: cfg.Host},
timestamp: fmt.Sprintf("%d", time.Now().UnixMilli()),
pageTemplates: make(map[string]*template.Template),
}
res.version = www.Version
res.initTemplates()
return &res
}
func (hg *webHandlerGroup) Prefix() string {
return "/web"
}
func (hg *webHandlerGroup) GroupDefs() []handlerDef {
return []handlerDef{
{"GET", "/feeds/{feed}", func(w http.ResponseWriter, r *http.Request) { hg.getOneFeed(w, r) }},
{"GET", "/feeds", func(w http.ResponseWriter, r *http.Request) { hg.getFeeds(w, r) }},
{"GET", "/changes", func(w http.ResponseWriter, r *http.Request) { hg.getChanges(w, r) }},
{"GET", "/about", func(w http.ResponseWriter, r *http.Request) { hg.getAbout(w, r) }},
{"GET", rootPlacholder, func(w http.ResponseWriter, r *http.Request) { hg.getRoot(w, r) }},
{"GET", notFoundPlacholder, func(w http.ResponseWriter, r *http.Request) { hg.send404(w, r) }},
}
}
func (hg *webHandlerGroup) AuthMW() func(next http.Handler) http.Handler {
return emptyMW
}
// initTemplates parses every page once, at startup: a main-<name>.tmpl
// together with all the templates that are not a main-*.tmpl. They are
// compiled into the binary (package www), so they cannot change while it runs.
func (hg *webHandlerGroup) initTemplates() {
mainFiles, err := fs.Glob(www.FS, "main-*.tmpl")
if err != nil {
hg.logger.Errorf("Failed to list main-*.tmpl: %v", err)
panic(err)
}
for _, fn := range mainFiles {
mainName := strings.TrimPrefix(fn, "main-")
mainName = strings.TrimSuffix(mainName, ".tmpl")
var t *template.Template
if t, err = hg.parsePageTemplate(mainName); err != nil {
hg.logger.Errorf("Failed to parse page template: %s: %v", fn, err)
panic(err)
}
hg.pageTemplates[mainName] = t
}
}
func (hg *webHandlerGroup) parsePageTemplate(mainName string) (*template.Template, error) {
t := template.New("master")
hg.addTemplateFuncs(t)
tmplFiles, err := fs.Glob(www.FS, "*.tmpl")
if err != nil {
return nil, err
}
var files []string
foundMain := false
for _, fn := range tmplFiles {
if strings.HasPrefix(fn, "main-") {
if fn != "main-"+mainName+".tmpl" {
continue
}
foundMain = true
}
files = append(files, fn)
}
if !foundMain {
return nil, fmt.Errorf("did not find 'main' template for %s", mainName)
}
return t.ParseFS(www.FS, files...)
}
func (hg *webHandlerGroup) mustGetPageTemplate(mainName string) (*template.Template, *baseModel) {
t, found := hg.pageTemplates[mainName]
if !found {
err := fmt.Errorf("Page template not found: %s", mainName)
hg.logger.Errorf("%v", err)
panic(err)
}
return t, &baseModel{
// The assets cannot change while the binary runs, so its start time
// is a cache buster that changes exactly when they may have.
Timestamp: hg.timestamp,
Version: hg.version,
Host: hg.cfg.Host,
Birb: shared.MakeFullMoniker(hg.cfg.Host, hg.cfg.Birb.User),
// Restricted tells visitors that they cannot request feeds themselves.
Restricted: hg.cfg.RestrictRequests,
}
}
func (hg *webHandlerGroup) addTemplateFuncs(t *template.Template) {
profileUrl := func(handle string) string {
return hg.idb.UserProfile(handle)
}
prettyDate := func(t time.Time) string {
return fmt.Sprintf("%s %d, %d", months[t.Month()-1], t.Day(), t.Year())
}
prettyDateTime := func(t time.Time) string {
dateStr := prettyDate(t)
return fmt.Sprintf("%s %02d:%02d", dateStr, t.Hour(), t.Minute())
}
t.Funcs(template.FuncMap{
"isNonEmptyString": func(s string) bool { return s != "" },
"prettyDate": prettyDate,
"prettyDateTime": prettyDateTime,
"profileUrl": profileUrl,
})
}
type baseModel struct {
Timestamp string
Version string
Host string // public domain of this instance
Birb string // full moniker of the birb, @user@host
Restricted bool // only allowlisted requesters may add feeds
LnkFeedsClass string
LnkChangesClass string
LnkAboutClass string
Data any
}
func (hg *webHandlerGroup) getRoot(w http.ResponseWriter, r *http.Request) {
t, model := hg.mustGetPageTemplate("root")
t.ExecuteTemplate(w, "index.tmpl", model)
}
func (hg *webHandlerGroup) send404(w http.ResponseWriter, r *http.Request) {
if acceptsJson(r) {
writeErrorResponse(w, notFoundStr, http.StatusNotFound)
return
}
t, model := hg.mustGetPageTemplate("404")
w.WriteHeader(http.StatusNotFound)
w.Header().Set("X-Robots-Tag", "noindex")
t.ExecuteTemplate(w, "index.tmpl", model)
}
func (hg *webHandlerGroup) send500(w http.ResponseWriter, r *http.Request) {
t, model := hg.mustGetPageTemplate("500")
w.WriteHeader(http.StatusNotFound)
w.Header().Set("X-Robots-Tag", "noindex")
t.ExecuteTemplate(w, "index.tmpl", model)
}
func (hg *webHandlerGroup) getAbout(w http.ResponseWriter, r *http.Request) {
t, model := hg.mustGetPageTemplate("about")
model.LnkAboutClass = "selected"
t.ExecuteTemplate(w, "index.tmpl", model)
}
func (hg *webHandlerGroup) getChanges(w http.ResponseWriter, r *http.Request) {
t, model := hg.mustGetPageTemplate("changes")
model.LnkChangesClass = "selected"
t.ExecuteTemplate(w, "index.tmpl", model)
}
type feedsModel struct {
Feeds []*dal.Account
Pages []pageLink
}
type pageLink struct {
Query string
Display int
Class string
}
func (hg *webHandlerGroup) getFeeds(w http.ResponseWriter, r *http.Request) {
var err error
pageIx := 0
pageParam := r.URL.Query().Get("page")
if pageIx, err = strconv.Atoi(pageParam); err != nil || pageIx < 0 {
pageIx = 0
}
var accounts []*dal.Account
var total int
accounts, total, err = hg.repo.GetAccountsPage(pageIx*feedsPerPage, feedsPerPage)
if err != nil {
hg.logger.Errorf("Error retrieving feeds %v", err)
hg.send500(w, r)
return
}
// Remove birb's built-in account
total -= 1
nonBuiltInAccounts := make([]*dal.Account, 0, len(accounts))
for _, acct := range accounts {
if acct.Handle == hg.cfg.Birb.User {
continue
}
nonBuiltInAccounts = append(nonBuiltInAccounts, acct)
}
data := feedsModel{
Feeds: nonBuiltInAccounts,
}
for i := 0; i < total/feedsPerPage+1; i++ {
pl := pageLink{
Display: i + 1,
}
if i == pageIx {
pl.Class = "selected"
}
if i != 0 {
pl.Query = fmt.Sprintf("?page=%d", i)
}
data.Pages = append(data.Pages, pl)
}
t, model := hg.mustGetPageTemplate("feeds")
model.LnkFeedsClass = "selected"
model.Data = &data
w.Header().Set("X-Robots-Tag", "noindex")
t.ExecuteTemplate(w, "index.tmpl", model)
}
type oneFeedModel struct {
Handle string
Name string
Bio template.HTML
SiteUrl string
SiteUrlNoSchema string
FeedUrl string
FeedUrlNoSchema string
FollowerCount uint
PostCount uint
Posts []*dal.FeedPost
NotShownPosts uint
}
func (hg *webHandlerGroup) loadFeedData(acct *dal.Account) *oneFeedModel {
var err error
bio := hg.txt.WithVals("acct_bio.html", map[string]string{
"siteUrl": hg.idb.SiteUrl(),
"description": acct.FeedSummary,
})
var followerCount, postCount uint
if followerCount, err = hg.repo.GetFollowerCount(acct.Handle, true); err != nil {
hg.logger.Errorf("Error retrieving follower count for %s: %v", acct.Handle, err)
return nil
}
if postCount, err = hg.repo.GetPostCount(acct.Handle); err != nil {
hg.logger.Errorf("Error retrieving post count for %s: %v", acct.Handle, err)
return nil
}
data := oneFeedModel{
Handle: shared.MakeFullMoniker(hg.cfg.Host, acct.Handle),
Name: shared.GetNameWithParrot(acct.FeedName),
Bio: template.HTML(bio),
SiteUrl: acct.SiteUrl,
FeedUrl: acct.FeedUrl,
FollowerCount: followerCount,
PostCount: postCount,
}
data.FeedUrlNoSchema = strings.TrimPrefix(data.FeedUrl, "https://")
data.FeedUrlNoSchema = strings.TrimPrefix(data.FeedUrlNoSchema, "http://")
data.SiteUrlNoSchema = strings.TrimPrefix(data.SiteUrl, "https://")
data.SiteUrlNoSchema = strings.TrimPrefix(data.SiteUrlNoSchema, "http://")
data.Posts, err = hg.repo.GetPostsPage(acct.Id, 0, postsPerPage)
if err != nil {
hg.logger.Errorf("Error retrieving posts for %s: %v", acct.Handle, err)
return nil
}
for _, p := range data.Posts {
p.Description = shared.TruncateWithEllipsis(p.Description, shared.MaxDescriptionLen)
}
if data.PostCount > uint(len(data.Posts)) {
data.NotShownPosts = data.PostCount - uint(len(data.Posts))
}
return &data
}
func (hg *webHandlerGroup) getOneFeed(w http.ResponseWriter, r *http.Request) {
hg.logger.Infof("Handling user GET: %s", r.URL.Path)
feedName := r.PathValue("feed")
feedName = strings.ToLower(feedName)
if feedName == hg.cfg.Birb.User {
hg.logger.Infof("Requesting profile of '%s'; redirecting to root", hg.cfg.Birb.User)
http.Redirect(w, r, "/", http.StatusSeeOther)
return
}
acct, err := hg.repo.GetAccount(feedName)
if acct == nil {
if err == nil {
hg.logger.Infof("Feed '%s' doesn't exist; returning a 404", feedName)
hg.send404(w, r)
return
} else {
hg.logger.Errorf("Error retrieving feed %s: %v", feedName, err)
hg.send500(w, r)
return
}
}
data := hg.loadFeedData(acct)
if data == nil {
hg.send500(w, r)
return
}
t, model := hg.mustGetPageTemplate("one-feed")
model.LnkFeedsClass = "selected"
model.Data = data
w.Header().Set("X-Robots-Tag", "noindex")
t.ExecuteTemplate(w, "index.tmpl", model)
}
|