Fix group file metadata and access

server/im_http.go

@@ -5220,7 +5220,7 @@ func serveIMGroupFiles(wrt http.ResponseWriter, req *http.Request, topic, tail s
 		if !decodeIMJSONBody(wrt, req, &body) {
 			return
 		}
-		fileID := strings.TrimSpace(body.FileID)
+		fileID := normalizeIMUploadedFileID(body.FileID)
 		if fileID == "" {
 			writeIMError(wrt, req, http.StatusBadRequest, 30000, imReasonMalformedRequest, "malformed request", map[string]any{"field": "file_id"})
 			return
@@ -6817,6 +6817,33 @@ func normalizeIMFileType(raw string) string {
 	}
 }
 
+func normalizeIMUploadedFileID(raw string) string {
+	value := strings.TrimSpace(raw)
+	if value == "" {
+		return ""
+	}
+	if cut, _, ok := strings.Cut(value, "?"); ok {
+		value = cut
+	}
+	if cut, _, ok := strings.Cut(value, "#"); ok {
+		value = cut
+	}
+	if strings.Contains(value, "/") && store.Store != nil && store.Store.GetMediaHandler() != nil {
+		if fid := store.Store.GetMediaHandler().GetIdFromUrl(value); !fid.IsZero() {
+			return fid.String()
+		}
+	}
+	if fid := types.ParseUid(value); !fid.IsZero() {
+		return fid.String()
+	}
+	if dot := strings.IndexByte(value, '.'); dot > 0 {
+		if fid := types.ParseUid(value[:dot]); !fid.IsZero() {
+			return fid.String()
+		}
+	}
+	return ""
+}
+
 func parseIMLimit(raw string, fallback, max int) int {
 	limit := fallback
 	if raw != "" {