vole
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A free and open-source forge that lives in your Git repo.
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6ce635a8
Keenan Nemetz
1d ago
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1 | package web |
| 2 | ||
| 3 | // The instance repository's static files. A theme's CSS, favicon and assets are | |
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ed03b3d1
Keenan Nemetz
2h ago
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4 | // served from /-/static/custom/ before the embedded set is consulted, so the URL |
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6ce635a8
Keenan Nemetz
1d ago
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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 | ||
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ed03b3d1
Keenan Nemetz
2h ago
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20 | const instanceAssetPrefix = "/-/static/custom/" |
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6ce635a8
Keenan Nemetz
1d ago
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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 | ||
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ed03b3d1
Keenan Nemetz
2h ago
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33 | // serveInstanceAsset answers a request under /-/static/custom/ and reports whether |
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6ce635a8
Keenan Nemetz
1d ago
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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 | |
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f7a34d87
Keenan Nemetz
1d ago
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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 | } | |
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6ce635a8
Keenan Nemetz
1d ago
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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 | } |