Add ebook metadata, author and cover display

internal/web/handlers.go

@@ -24,6 +24,7 @@ func (h *Handler) RegisterRoutes(mux *http.ServeMux) {
 	mux.HandleFunc("GET /", h.listBooks)
 	mux.HandleFunc("GET /book/{id}", h.bookDetails)
 	mux.HandleFunc("GET /download/{id}", h.downloadBook)
+	mux.HandleFunc("GET /cover/{id}", h.bookCover)
 	mux.Handle("GET /static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))
 }
 
@@ -84,6 +85,31 @@ func (h *Handler) downloadBook(w http.ResponseWriter, r *http.Request) {
 	http.ServeFile(w, r, cleanPath)
 }
 
+func (h *Handler) bookCover(w http.ResponseWriter, r *http.Request) {
+	id := r.PathValue("id")
+	if id == "" {
+		http.NotFound(w, r)
+		return
+	}
+
+	data, contentType, err := h.lib.CoverBytes(id)
+	if err != nil {
+		http.Error(w, "failed to load cover", http.StatusInternalServerError)
+		return
+	}
+	if len(data) == 0 {
+		http.NotFound(w, r)
+		return
+	}
+	if contentType == "" {
+		contentType = "application/octet-stream"
+	}
+
+	w.Header().Set("Content-Type", contentType)
+	w.Header().Set("Cache-Control", "public, max-age=3600")
+	_, _ = w.Write(data)
+}
+
 func render(w http.ResponseWriter, ctx context.Context, c templ.Component) {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	if err := c.Render(ctx, w); err != nil && !errors.Is(err, context.Canceled) {