Local API: Add PO tokens to the caption URLs (FreeTubeApp#7484)

Author: absidue

src/renderer/helpers/api/local.js

@@ -199,7 +199,7 @@ export async function getLocalSearchContinuation(continuationData) {
 export async function getLocalVideoInfo(id) {
   const webInnertube = await createInnertube({ withPlayer: true, generateSessionLocally: false })
 
-  // based on the videoId (added to the body of the /player request)
+  // based on the videoId (added to the body of the /player request and to caption URLs)
   let contentPoToken
   // based on the visitor data (added to the streaming URLs)
   let sessionPoToken
@@ -223,6 +223,8 @@ export async function getLocalVideoInfo(id) {
     }
   }
 
+  let clientName = webInnertube.session.context.client.clientName
+
   const info = await webInnertube.getInfo(id)
 
   // temporary workaround for SABR-only responses
@@ -231,6 +233,8 @@ export async function getLocalVideoInfo(id) {
   if (mwebInfo.playability_status.status === 'OK' && mwebInfo.streaming_data) {
     info.playability_status = mwebInfo.playability_status
     info.streaming_data = mwebInfo.streaming_data
+
+    clientName = 'MWEB'
   }
 
   let hasTrailer = info.has_trailer
@@ -265,6 +269,8 @@ export async function getLocalVideoInfo(id) {
 
       hasTrailer = false
       trailerIsAgeRestricted = false
+
+      clientName = webEmbeddedInnertube.session.context.client.clientName
     }
   }
 
@@ -309,6 +315,18 @@ export async function getLocalVideoInfo(id) {
     }
   }
 
+  if (info.captions?.caption_tracks) {
+    for (const captionTrack of info.captions.caption_tracks) {
+      const url = new URL(captionTrack.base_url)
+
+      url.searchParams.set('potc', '1')
+      url.searchParams.set('pot', contentPoToken)
+      url.searchParams.set('c', clientName)
+
+      captionTrack.base_url = url.toString()
+    }
+  }
+
   return info
 }