api: support new xiaohongshu links, add fallbacks to getRedirectingURL

closes #1394
Co-authored-by: wukko <me@wukko.me>

api/src/misc/utils.js

@@ -1,4 +1,4 @@
-import { request } from 'undici';
+import { request } from "undici";
 const redirectStatuses = new Set([301, 302, 303, 307, 308]);
 
 export async function getRedirectingURL(url, dispatcher, headers) {
@@ -8,18 +8,34 @@ export async function getRedirectingURL(url, dispatcher, headers) {
         headers,
         redirect: 'manual'
     };
+    const getParams = {
+        ...params,
+        method: 'GET',
+    };
 
-    let location = await request(url, params).then(r => {
+    const callback = (r) => {
         if (redirectStatuses.has(r.statusCode) && r.headers['location']) {
             return r.headers['location'];
         }
-    }).catch(() => null);
+    }
 
-    location ??= await fetch(url, params).then(r => {
-        if (redirectStatuses.has(r.status) && r.headers.has('location')) {
-            return r.headers.get('location');
-        }
-    }).catch(() => null);
+    /*
+        try request() with HEAD & GET,
+        then do the same with fetch
+        (fetch is required for shortened reddit links)
+    */
+
+    let location = await request(url, params)
+        .then(callback).catch(() => null);
+
+    location ??= await request(url, getParams)
+        .then(callback).catch(() => null);
+
+    location ??= await fetch(url, params)
+        .then(callback).catch(() => null);
+
+    location ??= await fetch(url, getParams)
+        .then(callback).catch(() => null);
 
     return location;
 }