vole
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A free and open-source forge that lives in your Git repo.
| 1 | package web |
| 2 | |
| 3 | // The instance repository's static files. A theme's CSS, favicon and assets are |
| 4 | // served from /-/static/custom/ before the embedded set is consulted, so the URL |
| 5 | // namespace is one: a theme file never has to shadow a built-in path, and a miss |
| 6 | // is still the embedded 404. |
| 7 | // |
| 8 | // The response is keyed by the commit it came from: the URL carries ?v=<commit>, |
| 9 | // and the ETag is that commit. A push moves the commit and every custom URL with |
| 10 | // it, so a browser never has to revalidate a file that cannot have changed. |
| 11 | |
| 12 | import ( |
| 13 | "bytes" |
| 14 | "net/http" |
| 15 | "path" |
| 16 | "strings" |
| 17 | "time" |
| 18 | ) |
| 19 | |
| 20 | const instanceAssetPrefix = "/-/static/custom/" |
| 21 | |
| 22 | // Static serves the instance repository's files first, then the embedded assets. |
| 23 | func (w *Web) Static() http.Handler { |
| 24 | embedded := Static() |
| 25 | return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { |
| 26 | if w.serveInstanceAsset(rw, r) { |
| 27 | return |
| 28 | } |
| 29 | embedded.ServeHTTP(rw, r) |
| 30 | }) |
| 31 | } |
| 32 | |
| 33 | // serveInstanceAsset answers a request under /-/static/custom/ and reports whether |
| 34 | // it did. It never builds a filesystem path: the snapshot map is the whole |
| 35 | // lookup, so a traversal is simply a miss. |
| 36 | func (w *Web) serveInstanceAsset(rw http.ResponseWriter, r *http.Request) bool { |
| 37 | if w.InstanceRepo == nil || !strings.HasPrefix(r.URL.Path, instanceAssetPrefix) { |
| 38 | return false |
| 39 | } |
| 40 | snap := w.InstanceRepo.Current() |
| 41 | if snap == nil { |
| 42 | return false |
| 43 | } |
| 44 | rel := strings.TrimPrefix(r.URL.Path, instanceAssetPrefix) |
| 45 | var body []byte |
| 46 | switch { |
| 47 | case rel == "profile/custom.css": |
| 48 | body = snap.CSS |
| 49 | case rel == "profile/favicon.svg": |
| 50 | body = snap.Favicon |
| 51 | case strings.HasPrefix(rel, "themes/") && strings.HasSuffix(rel, ".css"): |
| 52 | id := strings.TrimSuffix(strings.TrimPrefix(rel, "themes/"), ".css") |
| 53 | for _, t := range snap.Themes { |
| 54 | if t.ID == id { |
| 55 | body = t.CSS |
| 56 | break |
| 57 | } |
| 58 | } |
| 59 | case strings.HasPrefix(rel, "assets/"): |
| 60 | if a, ok := snap.Assets[strings.TrimPrefix(rel, "assets/")]; ok { |
| 61 | body = a.Body |
| 62 | } |
| 63 | } |
| 64 | if len(body) == 0 { |
| 65 | return false |
| 66 | } |
| 67 | v := snap.Commit |
| 68 | if len(v) > 12 { |
| 69 | v = v[:12] |
| 70 | } |
| 71 | rw.Header().Set("ETag", `"`+v+`"`) |
| 72 | rw.Header().Set("Cache-Control", "no-cache") |
| 73 | rw.Header().Set("X-Content-Type-Options", "nosniff") |
| 74 | if strings.HasSuffix(rel, ".svg") { |
| 75 | // An SVG opened directly is a document, and a document can carry script. |
| 76 | // The CSP makes it inert; as an <img> it renders normally. |
| 77 | rw.Header().Set("Content-Security-Policy", "default-src 'none'; style-src 'unsafe-inline'") |
| 78 | } |
| 79 | // ServeContent answers If-None-Match from the ETag and picks the content type |
| 80 | // from the name; an unlisted file never gets this far. |
| 81 | http.ServeContent(rw, r, path.Base(rel), time.Time{}, bytes.NewReader(body)) |
| 82 | return true |
| 83 | } |
| 84 |