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-rw-r--r--mediaapi/routing/download.go2
1 files changed, 1 insertions, 1 deletions
diff --git a/mediaapi/routing/download.go b/mediaapi/routing/download.go
index 9feca90e..75df313f 100644
--- a/mediaapi/routing/download.go
+++ b/mediaapi/routing/download.go
@@ -43,7 +43,7 @@ import (
const mediaIDCharacters = "A-Za-z0-9_=-"
// Note: unfortunately regex.MustCompile() cannot be assigned to a const
-var mediaIDRegex = regexp.MustCompile("[" + mediaIDCharacters + "]+")
+var mediaIDRegex = regexp.MustCompile("^[" + mediaIDCharacters + "]+$")
// downloadRequest metadata included in or derivable from a download or thumbnail request
// https://matrix.org/docs/spec/client_server/r0.2.0.html#get-matrix-media-r0-download-servername-mediaid