1 files changed, 10 insertions, 1 deletions

diff --git a/server/helpers/custom-validators/activitypub/misc.ts b/server/helpers/custom-validators/activitypub/misc.ts
index 4ee8e6fee..9d823299f 100644
--- a/server/helpers/custom-validators/activitypub/misc.ts
+++ b/server/helpers/custom-validators/activitypub/misc.ts
@@ -57,10 +57,19 @@ function setValidAttributedTo (obj: any) {
   return true
 }
 
+function isActivityPubVideoDurationValid (value: string) {
+  // https://www.w3.org/TR/activitystreams-vocabulary/#dfn-duration
+  return exists(value) &&
+    typeof value === 'string' &&
+    value.startsWith('PT') &&
+    value.endsWith('S')
+}
+
 export {
   isUrlValid,
   isActivityPubUrlValid,
   isBaseActivityValid,
   setValidAttributedTo,
-  isObjectValid
+  isObjectValid,
+  isActivityPubVideoDurationValid
 }