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package forge
import (
"bytes"
"mime"
"net"
"net/http"
"path"
"regexp"
"strings"
"time"
)
const (
pagesBranch = "pages"
pagesRepo = "pages"
maxPage = 32 << 20
pagesMinAge = 24 * time.Hour
)
var pagesLabel = regexp.MustCompile(`^[a-z0-9]([a-z0-9-]{0,37}[a-z0-9])?$`)
var pageTypes = map[string]string{
".html": "text/html; charset=utf-8",
".htm": "text/html; charset=utf-8",
".css": "text/css; charset=utf-8",
".js": "text/javascript; charset=utf-8",
".mjs": "text/javascript; charset=utf-8",
".json": "application/json",
".map": "application/json",
".txt": "text/plain; charset=utf-8",
".md": "text/plain; charset=utf-8",
".xml": "application/xml",
".svg": "image/svg+xml",
".png": "image/png",
".jpg": "image/jpeg",
".jpeg": "image/jpeg",
".gif": "image/gif",
".webp": "image/webp",
".avif": "image/avif",
".ico": "image/x-icon",
".woff": "font/woff",
".woff2": "font/woff2",
".ttf": "font/ttf",
".otf": "font/otf",
".wasm": "application/wasm",
".pdf": "application/pdf",
".mp4": "video/mp4",
".webm": "video/webm",
".mp3": "audio/mpeg",
".ogg": "audio/ogg",
".wav": "audio/wav",
}
func pageType(name string) string {
ext := strings.ToLower(path.Ext(name))
if t, ok := pageTypes[ext]; ok {
return t
}
if t := mime.TypeByExtension(ext); t != "" {
return t
}
return "application/octet-stream"
}
func bareHost(host string) string {
host = strings.ToLower(host)
if h, _, err := net.SplitHostPort(host); err == nil {
host = h
}
return strings.TrimSuffix(host, ".")
}
func (s *Server) pagesOwner(host string) (label string, sub bool) {
host = bareHost(host)
label, sub = strings.CutSuffix(host, "."+s.host)
if !sub || !pagesLabel.MatchString(label) || reservedUsers[label] {
return "", sub
}
return label, true
}
type pageSite struct {
repo Repo
g Git
commit string
prefix string
}
func (s *Server) pagesEnabled(owner User) bool {
return time.Since(owner.Created) >= pagesMinAge && s.store.PagesAllowed(owner.ID)
}
func (s *Server) pageSite(owner User, name string, branchOnly bool) (pageSite, bool) {
repo, err := s.store.RepoByPath(owner.Name, name)
if err != nil || repo.Private {
return pageSite{}, false
}
g := Git{Dir: s.repoDir(repo)}
commit, err := g.Resolve("refs/heads/" + pagesBranch)
if err != nil && !branchOnly {
commit, err = g.Resolve("HEAD")
}
if err != nil {
return pageSite{}, false
}
return pageSite{repo: repo, g: g, commit: commit}, true
}
func (g Git) pageEntry(commit, filePath string) (mode, oid string, ok bool) {
out, err := g.run(nil, "ls-tree", "-z", "--full-tree", commit, "--", filePath)
if err != nil || len(out) == 0 {
return "", "", false
}
meta, name, found := strings.Cut(strings.TrimSuffix(string(out), "\x00"), "\t")
f := strings.Fields(meta)
if !found || name != filePath || len(f) != 3 {
return "", "", false
}
return f[0], f[2], true
}
func (s *Server) servePages(w http.ResponseWriter, r *http.Request, label string) {
h := w.Header()
h.Set("X-Content-Type-Options", "nosniff")
h.Set("Referrer-Policy", "strict-origin-when-cross-origin")
if r.Method != "GET" && r.Method != "HEAD" {
h.Set("Allow", "GET, HEAD")
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
return
}
if !s.requests.allow(clientIP(r)) {
h.Set("Retry-After", "10")
http.Error(w, "too many requests, slow down", http.StatusTooManyRequests)
return
}
notFound := func() { http.Error(w, "page not found", http.StatusNotFound) }
owner, err := s.store.UserByName(label)
if err != nil || s.store.IsBanned(owner.ID) || !s.pagesEnabled(owner) {
notFound()
return
}
rel, ok := cleanPath(r.URL.Path)
if !ok {
notFound()
return
}
var site pageSite
first, rest, _ := strings.Cut(rel, "/")
if first != "" && first != pagesRepo && validName(first) {
if sub, found := s.pageSite(owner, first, true); found {
if rest == "" && !strings.HasSuffix(r.URL.Path, "/") {
http.Redirect(w, r, "/"+first+"/", http.StatusMovedPermanently)
return
}
site, rel = sub, rest
site.prefix = "/" + first
}
}
if site.commit == "" {
root, found := s.pageSite(owner, pagesRepo, false)
if !found {
notFound()
return
}
site = root
}
file := rel
if file == "" || strings.HasSuffix(r.URL.Path, "/") {
file = path.Join(file, "index.html")
}
mode, oid, found := site.g.pageEntry(site.commit, file)
if found && mode == "040000" {
http.Redirect(w, r, site.prefix+"/"+rel+"/", http.StatusMovedPermanently)
return
}
if !found && path.Ext(file) == "" {
mode, oid, found = site.g.pageEntry(site.commit, file+".html")
file += ".html"
}
status := http.StatusOK
if !found || (mode != "100644" && mode != "100755") {
mode, oid, found = site.g.pageEntry(site.commit, "404.html")
if !found || (mode != "100644" && mode != "100755") {
notFound()
return
}
file, status = "404.html", http.StatusNotFound
}
size := site.g.Size(site.commit, file)
if size > maxPage {
http.Error(w, "file too large for pages", http.StatusRequestEntityTooLarge)
return
}
if size > 1<<20 && !s.heavy.allow(clientIP(r)) {
h.Set("Retry-After", "10")
http.Error(w, "too many requests, slow down", http.StatusTooManyRequests)
return
}
data, err := site.g.run(nil, "cat-file", "blob", oid)
if err != nil {
notFound()
return
}
h.Set("Content-Type", pageType(file))
h.Set("Cache-Control", "public, max-age=60")
if status != http.StatusOK {
w.WriteHeader(status)
if r.Method == "GET" {
w.Write(data)
}
return
}
h.Set("ETag", `"`+oid+`"`)
http.ServeContent(w, r, "", time.Time{}, bytes.NewReader(data))
}
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