updates

Former-commit-id: 9c36dea485

http_utils.go

@@ -0,0 +1,50 @@
+package filemanager
+
+import (
+	"net/http"
+	"os"
+)
+
+// responseWriterNoBody is a wrapper used to suprress the body of the response
+// to a request. Mainly used for HEAD requests.
+type responseWriterNoBody struct {
+	http.ResponseWriter
+}
+
+// newResponseWriterNoBody creates a new responseWriterNoBody.
+func newResponseWriterNoBody(w http.ResponseWriter) *responseWriterNoBody {
+	return &responseWriterNoBody{w}
+}
+
+// Header executes the Header method from the http.ResponseWriter.
+func (w responseWriterNoBody) Header() http.Header {
+	return w.ResponseWriter.Header()
+}
+
+// Write suprresses the body.
+func (w responseWriterNoBody) Write(data []byte) (int, error) {
+	return 0, nil
+}
+
+// WriteHeader writes the header to the http.ResponseWriter.
+func (w responseWriterNoBody) WriteHeader(statusCode int) {
+	w.ResponseWriter.WriteHeader(statusCode)
+}
+
+// errorToHTTP converts errors to HTTP Status Code.
+func errorToHTTP(err error, gone bool) int {
+	switch {
+	case os.IsPermission(err):
+		return http.StatusForbidden
+	case os.IsNotExist(err):
+		if !gone {
+			return http.StatusNotFound
+		}
+
+		return http.StatusGone
+	case os.IsExist(err):
+		return http.StatusGone
+	default:
+		return http.StatusInternalServerError
+	}
+}