/
talks.go
329 lines (289 loc) · 8.19 KB
/
talks.go
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package main
import (
"fmt"
"html/template"
"io"
"log"
"net/http"
"os"
pathpkg "path"
"sort"
"github.com/shurcooL/home/component"
"github.com/shurcooL/home/httputil"
"github.com/shurcooL/home/internal/exp/service/notification"
"github.com/shurcooL/home/presentdata"
"github.com/shurcooL/htmlg"
"github.com/shurcooL/httperror"
"github.com/shurcooL/httpfs/html/vfstemplate"
"github.com/shurcooL/httpfs/vfsutil"
"github.com/shurcooL/httpgzip"
"github.com/shurcooL/users"
"golang.org/x/net/html"
"golang.org/x/tools/present"
)
var talksHTML = template.Must(template.New("").Parse(`<html>
<head>
{{.AnalyticsHTML}} <title>Dmitri Shuralyov - Talks</title>
<link href="/icon.svg" rel="icon" type="image/svg+xml">
<meta name="viewport" content="width=device-width">
<link href="/assets/fonts/fonts.css" rel="stylesheet" type="text/css">
<link href="/assets/talks/style.css" rel="stylesheet" type="text/css">
</head>
<body>
<div style="max-width: 800px; margin: 0 auto 100px auto;">`))
// initTalks registers a talks handler with root as talks content source.
func initTalks(root http.FileSystem, notification notification.Service, users users.Service) {
// Host static files that slides need.
http.Handle("/static/", cookieAuth{httpgzip.FileServer(presentdata.Assets, httpgzip.FileServerOptions{ServeError: detailedForAdmin{Users: users}.ServeError})})
// Create a template for slides.
tmpl := present.Template()
tmpl = tmpl.Funcs(template.FuncMap{"playable": func(present.Code) bool { return false }})
tmpl = template.Must(vfstemplate.ParseFiles(presentdata.Assets, tmpl, "/templates/action.tmpl", "/templates/slides.tmpl"))
talksHandler := http.StripPrefix("/talks", cookieAuth{httputil.ErrorHandler(users, (&talksHandler{
base: "/talks",
fs: root,
slides: tmpl,
notification: notification,
users: users,
}).ServeHTTP)})
http.Handle("/talks", talksHandler)
http.Handle("/talks/", talksHandler)
}
type talksHandler struct {
base string // Base URL to prepend to links.
fs http.FileSystem
slides *template.Template
notification notification.Service
users users.Service
}
func (h *talksHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) error {
if req.Method != "GET" {
return httperror.Method{Allowed: []string{"GET"}}
}
if canonicalURL := pathpkg.Clean(req.RequestURI); canonicalURL != req.RequestURI {
if req.URL.RawQuery != "" {
canonicalURL += "?" + req.URL.RawQuery
}
return httperror.Redirect{URL: canonicalURL}
}
path := pathpkg.Clean("/" + req.URL.Path)
f, err := h.fs.Open(path)
if err != nil {
return err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return err
}
switch dir, ext := fi.IsDir(), pathpkg.Ext(fi.Name()); {
// Serve a directory listing.
case dir:
w.Header().Set("Content-Type", "text/html; charset=utf-8")
data := struct{ AnalyticsHTML template.HTML }{analyticsHTML}
err := talksHTML.Execute(w, data)
if err != nil {
return err
}
authenticatedUser, err := h.users.GetAuthenticated(req.Context())
if err != nil {
log.Println(err)
authenticatedUser = users.User{} // THINK: Should it be a fatal error or not? What about on frontend vs backend?
}
var nc uint64
if authenticatedUser.ID != 0 {
nc, err = h.notification.CountNotifications(req.Context())
if err != nil {
return err
}
}
returnURL := req.RequestURI
// Render the header.
header := component.Header{
CurrentUser: authenticatedUser,
NotificationCount: nc,
ReturnURL: returnURL,
}
err = htmlg.RenderComponents(w, header)
if err != nil {
return err
}
err = html.Render(w, htmlg.H1(htmlg.Text("Talks")))
if err != nil {
return err
}
err = html.Render(w, htmlg.H2(htmlg.Text(path)))
if err != nil {
return err
}
// Render the directory listing.
err = h.renderDir(w, path, f)
if err != nil {
return err
}
_, err = io.WriteString(w, `</div>`)
if err != nil {
return err
}
_, err = io.WriteString(w, `</body></html>`)
return err
// Serve a .slide presentation.
case !dir && ext == ".slide":
pctx := present.Context{
ReadFile: func(path string) ([]byte, error) { return vfsutil.ReadFile(h.fs, path) },
}
doc, err := pctx.Parse(f, path, 0)
if err != nil {
return err
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
return doc.Render(w, h.slides)
// Serve regular files (assets).
case !dir && ext != ".slide":
httpgzip.ServeContent(w, req, path, fi.ModTime(), f)
return nil
default:
panic("unreachable")
}
}
// renderDir renders to w the directory listing of d. The path is absolute and clean.
func (h *talksHandler) renderDir(w io.Writer, path string, d dirReader) error {
fis, err := d.Readdir(0)
if err != nil {
return err
}
dl := &dirList{Base: h.base, Path: path}
if path != "/" {
dl.Dirs = append(dl.Dirs, dirEntry{
Path: pathpkg.Join(path, ".."),
Name: "..",
})
}
hasSlides := hasSlides(fis)
for _, fi := range fis {
switch dir, ext := fi.IsDir(), pathpkg.Ext(fi.Name()); {
// Add directories to Dirs, if no slides.
case dir && !hasSlides:
dl.Dirs = append(dl.Dirs, dirEntry{
Path: pathpkg.Join(path, fi.Name()),
Name: fi.Name(),
})
// Add .slide files to Slides.
case !dir && ext == ".slide":
title, err := parseTitle(h.fs, pathpkg.Join(path, fi.Name()))
if err != nil {
log.Println(err)
title = ""
}
dl.Slides = append(dl.Slides, dirEntry{
Path: pathpkg.Join(path, fi.Name()),
Name: fi.Name(),
Title: title,
})
// Add .pdf files to Files.
case !dir && ext == ".pdf":
dl.Files = append(dl.Files, dirEntry{
Path: pathpkg.Join(path, fi.Name()),
Name: fi.Name(),
})
}
}
sort.Sort(dl.Dirs)
sort.Sort(dl.Slides)
sort.Sort(dl.Files)
_, err = io.WriteString(w, htmlg.Render(dl.Render()...))
return err
}
// hasSlides reports if there are any .slide files within fis.
func hasSlides(fis []os.FileInfo) bool {
for _, fi := range fis {
if !fi.IsDir() && pathpkg.Ext(fi.Name()) == ".slide" {
return true
}
}
return false
}
// dirList is a directory listing of slides and directories.
type dirList struct {
Base string // Base URL to prepend to links. E.g., "/talks".
Path string
Dirs, Slides, Files dirEntries
}
// Render renders the directory listing as HTML.
func (dl *dirList) Render() []*html.Node {
var nodes []*html.Node
if len(dl.Dirs) > 0 {
nodes = append(nodes,
htmlg.H4(htmlg.Text("Directories:")),
)
var ns []*html.Node
for _, d := range dl.Dirs {
ns = append(ns,
htmlg.DD(
htmlg.A(d.Name, pathpkg.Join(dl.Base, d.Path)),
),
)
}
nodes = append(nodes, htmlg.DL(ns...))
}
if len(dl.Slides) > 0 {
nodes = append(nodes,
htmlg.H4(htmlg.Text("Slides:")),
)
var ns []*html.Node
for _, s := range dl.Slides {
ns = append(ns,
htmlg.DD(
htmlg.A(s.Name, pathpkg.Join(dl.Base, s.Path)), htmlg.Text(": "+s.Title),
),
)
}
nodes = append(nodes, htmlg.DL(ns...))
}
if len(dl.Files) > 0 {
nodes = append(nodes,
htmlg.H4(htmlg.Text("Files:")),
)
var ns []*html.Node
for _, s := range dl.Files {
ns = append(ns,
htmlg.DD(
htmlg.A(s.Name, pathpkg.Join(dl.Base, s.Path)),
),
)
}
nodes = append(nodes, htmlg.DL(ns...))
}
return nodes
}
// dirEntry is an entry within a directory.
type dirEntry struct {
Path string
Name string
Title string // Slide title.
}
type dirEntries []dirEntry
func (s dirEntries) Len() int { return len(s) }
func (s dirEntries) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func (s dirEntries) Less(i, j int) bool { return s[i].Name < s[j].Name }
// parseTitle parses the title of .slide presentation at path.
func parseTitle(fs http.FileSystem, path string) (string, error) {
f, err := fs.Open(path)
if err != nil {
return "", err
}
defer f.Close()
doc, err := titlesContext.Parse(f, path, present.TitlesOnly)
if err != nil {
return "", err
}
return doc.Title, nil
}
// titlesContext is used for parsing titles only.
var titlesContext = present.Context{
// ReadFile should not be needed to parse titles.
ReadFile: func(path string) ([]byte, error) { return nil, fmt.Errorf("implementation not provided") },
}
type dirReader interface {
Readdir(count int) ([]os.FileInfo, error)
}