From bb449bff19852b1caf334a607a081b16490fe11c Mon Sep 17 00:00:00 2001
From: Giuseppe Lo Presti <giuseppe.lopresti@cern.ch>
Date: Tue, 7 Nov 2023 18:01:53 +0100
Subject: [PATCH] Fixed registration of custom extensions in the mime registry

---
 changelog/unreleased/mimes-fix.md | 6 ++++++
 pkg/mime/mime.go                  | 6 ++----
 2 files changed, 8 insertions(+), 4 deletions(-)
 create mode 100644 changelog/unreleased/mimes-fix.md

diff --git a/changelog/unreleased/mimes-fix.md b/changelog/unreleased/mimes-fix.md
new file mode 100644
index 0000000000..0aafe96b1f
--- /dev/null
+++ b/changelog/unreleased/mimes-fix.md
@@ -0,0 +1,6 @@
+Bugfix: fixed registration of custom extensions in the mime registry
+
+This PR ensures custom extensions/mime-types are registered by trimming
+any eventual leading '.' from the extension.
+
+https://github.com/cs3org/reva/pull/4319
diff --git a/pkg/mime/mime.go b/pkg/mime/mime.go
index 24e2a75267..4fe3cbbfb4 100644
--- a/pkg/mime/mime.go
+++ b/pkg/mime/mime.go
@@ -38,7 +38,7 @@ func init() {
 // a mime type with the given extension.
 // TODO(labkode): check that we do not override mime type mappings?
 func RegisterMime(ext, mime string) {
-	mimes.Store(ext, mime)
+	mimes.Store(strings.TrimPrefix(ext, "."), mime)
 }
 
 // Detect returns the mimetype associated with the given filename.
@@ -47,9 +47,7 @@ func Detect(isDir bool, fn string) string {
 		return defaultMimeDir
 	}
 
-	ext := path.Ext(fn)
-	ext = strings.TrimPrefix(ext, ".")
-
+	ext := strings.TrimPrefix(path.Ext(fn), ".")
 	mimeType := getCustomMime(ext)
 
 	if mimeType == "" {