Upgrade API, implement XRPC rework (#4857)

Co-authored-by: Matthieu Sieben <matthieu.sieben@gmail.com>

src/lib/api/feed/custom.ts

@@ -1,7 +1,6 @@
 import {
   AppBskyFeedDefs,
   AppBskyFeedGetFeed as GetCustomFeed,
-  AtpAgent,
   BskyAgent,
 } from '@atproto/api'
 
@@ -51,7 +50,7 @@ export class CustomFeedAPI implements FeedAPI {
     const agent = this.agent
     const isBlueskyOwned = isBlueskyOwnedFeed(this.params.feed)
 
-    const res = agent.session
+    const res = agent.did
       ? await this.agent.app.bsky.feed.getFeed(
           {
             ...this.params,
@@ -106,34 +105,32 @@ async function loggedOutFetch({
   let contentLangs = getContentLanguages().join(',')
 
   // manually construct fetch call so we can add the `lang` cache-busting param
-  let res = await AtpAgent.fetch!(
+  let res = await fetch(
     `https://api.bsky.app/xrpc/app.bsky.feed.getFeed?feed=${feed}${
       cursor ? `&cursor=${cursor}` : ''
     }&limit=${limit}&lang=${contentLangs}`,
-    'GET',
-    {'Accept-Language': contentLangs},
-    undefined,
+    {method: 'GET', headers: {'Accept-Language': contentLangs}},
   )
-  if (res.body?.feed?.length) {
+  let data = res.ok ? await res.json() : null
+  if (data?.feed?.length) {
     return {
       success: true,
-      data: res.body,
+      data,
     }
   }
 
   // no data, try again with language headers removed
-  res = await AtpAgent.fetch!(
+  res = await fetch(
     `https://api.bsky.app/xrpc/app.bsky.feed.getFeed?feed=${feed}${
       cursor ? `&cursor=${cursor}` : ''
     }&limit=${limit}`,
-    'GET',
-    {'Accept-Language': ''},
-    undefined,
+    {method: 'GET', headers: {'Accept-Language': ''}},
   )
-  if (res.body?.feed?.length) {
+  data = res.ok ? await res.json() : null
+  if (data?.feed?.length) {
     return {
       success: true,
-      data: res.body,
+      data,
     }
   }