63 lines
2.5 KiB
Go
63 lines
2.5 KiB
Go
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package handlers
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import (
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"fmt"
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"net/http"
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"os"
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"path"
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"path/filepath"
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"strings"
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)
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// staticCacheControl mirrors app.py's _STATIC_CACHE_CONTROL: static assets
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// aren't content-hashed in their filenames, so this has to stay short — it's
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// a revalidation window, not a long-lived immutable cache. Still saves a full
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// body re-transfer (the ETag/Last-Modified pair otherwise forces a
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// conditional GET on every navigation) for anything fetched again within it.
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// Stamped on every static file response, including 304s.
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const staticCacheControl = "public, max-age=300"
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// serveStatic is the catch-all under BASE — the Go analogue of app.py's
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// _CachedStaticFiles mount, matching Starlette's StaticFiles semantics rather
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// than http.FileServer's (which would 301 */index.html to the directory and
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// render directory listings; Starlette 404s both —
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// tests/unit/test_pages.py::test_old_static_index_is_gone pins the index.html
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// case, keeping it from lingering as indexable duplicate content behind the
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// server-rendered homepage).
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func (s *Server) serveStatic(w http.ResponseWriter, r *http.Request) {
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rel := strings.TrimPrefix(r.URL.Path, s.base)
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// Trailing-slash paths never name a file; Starlette 404'd them (the
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// mount swallowed everything under BASE, so redirect_slashes never ran
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// for them).
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if strings.HasSuffix(rel, "/") {
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writePlain(w, http.StatusNotFound, "Not Found")
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return
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}
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// Rooted Clean cannot escape the static dir ("/../x" cleans to "/x");
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// the mux has already cleaned the request path, this is belt and braces
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// for handlers invoked directly (the content package's lazy IndexNow
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// route delegates here without re-cleaning).
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rel = path.Clean("/" + strings.TrimPrefix(rel, "/"))
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full := filepath.Join(s.staticDir, filepath.FromSlash(strings.TrimPrefix(rel, "/")))
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info, err := os.Stat(full)
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if err != nil || info.IsDir() {
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writePlain(w, http.StatusNotFound, "Not Found")
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return
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}
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f, err := os.Open(full)
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if err != nil {
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writePlain(w, http.StatusNotFound, "Not Found")
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return
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}
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defer f.Close()
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w.Header().Set("Cache-Control", staticCacheControl)
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// Starlette's StaticFiles stamped a stat-derived ETag (mtime+size hash);
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// same recipe here so If-None-Match revalidation keeps costing an empty
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// 304 instead of a body re-transfer. Headers set before ServeContent
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// survive on its 304/206 paths, Cache-Control included.
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w.Header().Set("ETag", fmt.Sprintf("\"%x-%x\"", info.ModTime().UnixNano(), info.Size()))
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http.ServeContent(w, r, info.Name(), info.ModTime(), f)
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}
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