Ajoute un cache pour les couvertures

pmocover/handler.go

@@ -0,0 +1,62 @@
+package pmocover
+
+import (
+	"encoding/json"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+// ServeMux branche les routes /covers
+func (c *Cache) ServeMux(mux *http.ServeMux) {
+	// Images
+	mux.HandleFunc("/covers/images/", func(w http.ResponseWriter, r *http.Request) {
+		parts := strings.Split(strings.TrimPrefix(r.URL.Path, "/covers/images/"), "/")
+		if len(parts) == 0 || parts[0] == "" {
+			http.Error(w, "missing pk", 400)
+			return
+		}
+		pk := parts[0]
+		if len(parts) == 1 {
+			path, err := c.Get(pk)
+			if err != nil {
+				http.NotFound(w, r)
+				return
+			}
+			w.Header().Set("Content-Type", "image/webp")
+			http.ServeFile(w, r, path)
+			return
+		}
+		size, err := strconv.Atoi(parts[1])
+		if err != nil {
+			http.Error(w, "invalid size", 400)
+			return
+		}
+		variantPath := filepath.Join(c.dir, pk+"."+parts[1]+".webp")
+		if _, err := os.Stat(variantPath); os.IsNotExist(err) {
+			data, err := c.generateVariant(pk, size)
+			if err != nil {
+				http.Error(w, "cannot generate", 500)
+				return
+			}
+			w.Header().Set("Content-Type", "image/webp")
+			w.Write(data)
+			return
+		}
+		w.Header().Set("Content-Type", "image/webp")
+		http.ServeFile(w, r, variantPath)
+	})
+
+	// Stats
+	mux.HandleFunc("/covers/stats", func(w http.ResponseWriter, r *http.Request) {
+		entries, err := c.db.GetAll()
+		if err != nil {
+			http.Error(w, "cannot retrieve stats", 500)
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(entries)
+	})
+}