Added chunk handler

internal/apiServer/apiServer.go

@@ -19,6 +19,49 @@ type ApiServer struct {
 	Metadata *metadata.MetadataServer
 }
 
+func (apiServer *ApiServer) chunkHandler(w http.ResponseWriter, r *http.Request) {
+
+	// chunkIndex starts at 0
+	chunkIndexString := r.URL.Query().Get("chunkindex")
+	chunkSizeString := r.URL.Query().Get("chunksize")
+
+	chunkIndex := 0
+	var err error
+	if chunkIndexString != "" {
+		chunkIndex, err = strconv.Atoi(chunkIndexString)
+	}
+	if err != nil {
+		http.Error(w, fmt.Sprint(err), http.StatusBadRequest)
+	}
+
+	chunkSize := 0
+	if chunkSizeString != "" {
+		chunkSize, err = strconv.Atoi(chunkSizeString)
+	}
+	if err != nil {
+		http.Error(w, fmt.Sprint(err), http.StatusBadRequest)
+	}
+
+	filename := path.Base(path.Dir(r.URL.Path))
+
+	contents, err := apiServer.Audio.Download(filename)
+	if err != nil {
+		http.Error(w, fmt.Sprint(err), http.StatusNotFound)
+		return
+	}
+
+	startIndex := chunkIndex * chunkSize
+	if startIndex > len(contents) {
+		http.Error(w, "index out of bounds", http.StatusBadRequest)
+	}
+	endIndex := startIndex + chunkSize
+	if endIndex > len(contents) {
+		endIndex = len(contents)
+	}
+
+	w.Write(contents[startIndex:endIndex])
+
+}
 func (apiServer *ApiServer) filesHandler(w http.ResponseWriter, r *http.Request) {
 
 	filename := path.Base(r.URL.Path)
@@ -99,6 +142,8 @@ func (apiServer *ApiServer) Serve() {
 	r.Get("/files/{filename}", apiServer.filesHandler)
 	r.Post("/files/{filename}", apiServer.filesHandler)
 	r.Get("/files/{filename}/metadata", apiServer.metadataHandler)
+	// chunkNumber
+	r.Get("/files/{filename}/chunk", apiServer.chunkHandler)
 
 	log.Fatal(http.ListenAndServe(":3030", r))
 }