feat: Add custom image support to version 13 (#7557)

src/structures/Presence.js

@@ -351,13 +351,21 @@ class RichPresenceAssets {
    * @returns {?string}
    */
   smallImageURL({ format, size } = {}) {
-    return (
-      this.smallImage &&
-      this.activity.presence.client.rest.cdn.AppAsset(this.activity.applicationId, this.smallImage, {
-        format,
-        size,
-      })
-    );
+    if (!this.smallImage) return null;
+    if (this.smallImage.includes(':')) {
+      const [platform, id] = this.smallImage.split(':');
+      switch (platform) {
+        case 'mp':
+          return `https://media.discordapp.net/${id}`;
+        default:
+          return null;
+      }
+    }
+
+    return this.activity.presence.client.rest.cdn.AppAsset(this.activity.applicationId, this.smallImage, {
+      format,
+      size,
+    });
   }
 
   /**
@@ -367,11 +375,22 @@ class RichPresenceAssets {
    */
   largeImageURL({ format, size } = {}) {
     if (!this.largeImage) return null;
-    if (/^spotify:/.test(this.largeImage)) {
-      return `https://i.scdn.co/image/${this.largeImage.slice(8)}`;
-    } else if (/^twitch:/.test(this.largeImage)) {
-      return `https://static-cdn.jtvnw.net/previews-ttv/live_user_${this.largeImage.slice(7)}.png`;
+    if (this.largeImage.includes(':')) {
+      const [platform, id] = this.largeImage.split(':');
+      switch (platform) {
+        case 'mp':
+          return `https://media.discordapp.net/${id}`;
+        case 'spotify':
+          return `https://i.scdn.co/image/${id}`;
+        case 'youtube':
+          return `https://i.ytimg.com/vi/${id}/hqdefault_live.jpg`;
+        case 'twitch':
+          return `https://static-cdn.jtvnw.net/previews-ttv/live_user_${id}.png`;
+        default:
+          return null;
+      }
     }
+
     return this.activity.presence.client.rest.cdn.AppAsset(this.activity.applicationId, this.largeImage, {
       format,
       size,