69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
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package server
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import (
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"errors"
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"io/fs"
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"mime"
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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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// staticHandler serves the built web client with SPA fallback: unknown paths
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// return index.html so client-side routes survive a page reload.
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type staticHandler struct {
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root string
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}
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func newStaticHandler(root string) *staticHandler {
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return &staticHandler{root: root}
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}
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func (h *staticHandler) serve(w http.ResponseWriter, r *http.Request) {
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cleaned := path.Clean("/" + r.URL.Path)
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rel := strings.TrimPrefix(cleaned, "/")
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if rel == "" {
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h.serveIndex(w, r)
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return
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}
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info, err := fs.Stat(os.DirFS(h.root), rel)
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if err != nil || info.IsDir() {
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if err != nil && !errors.Is(err, fs.ErrNotExist) {
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http.Error(w, "internal error", http.StatusInternalServerError)
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return
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}
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h.serveIndex(w, r)
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return
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}
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if contentType := mime.TypeByExtension(filepath.Ext(rel)); contentType != "" {
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w.Header().Set("Content-Type", contentType)
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}
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if strings.HasPrefix(rel, "assets/") {
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w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
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} else {
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w.Header().Set("Cache-Control", "no-cache")
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}
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http.ServeFile(w, r, filepath.Join(h.root, filepath.FromSlash(rel)))
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}
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func (h *staticHandler) serveIndex(w http.ResponseWriter, r *http.Request) {
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index := filepath.Join(h.root, "index.html")
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if _, err := os.Stat(index); err != nil {
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writeClientNotBuilt(w)
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return
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.Header().Set("Cache-Control", "no-cache")
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http.ServeFile(w, r, index)
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}
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func writeClientNotBuilt(w http.ResponseWriter) {
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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w.WriteHeader(http.StatusServiceUnavailable)
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_, _ = w.Write([]byte("glchat: web client bundle is not present in this image\n"))
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}
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