rebuilding js

Former-commit-id: 027e2f6546614d28750e437b9a3545cb95235d9d [formerly 6dbfe621a5774304295c17f216b5c96beaaaa95a] [formerly d44822f30d9a3649b20daa7a3cdbf86c87e63c99 [formerly 325855234967d92bf42b77b17fd8affdcc7f1392]]
Former-commit-id: 7f34ddc1b32076c6ad2c2a4374b170b7f5d84000 [formerly aaafd299a933d25ebcb5fdebe1b00cb9e8309d7a]
Former-commit-id: 7bb183c165ba2c9711ba1c04e3af6e2048245ded

checksum.go

@@ -0,0 +1,18 @@
+package filemanager
+
+import "net/http"
+
+// serveChecksum calculates the hash of a file. Supports MD5, SHA1, SHA256 and SHA512.
+func serveChecksum(c *requestContext, w http.ResponseWriter, r *http.Request) (int, error) {
+	query := r.URL.Query().Get("checksum")
+
+	val, err := c.fi.Checksum(query)
+	if err == errInvalidOption {
+		return http.StatusBadRequest, err
+	} else if err != nil {
+		return http.StatusInternalServerError, err
+	}
+
+	w.Write([]byte(val))
+	return http.StatusOK, nil
+}