feat(Channel): Support getting about with PageHeader (#581)

Author: absidue

src/parser/classes/DescriptionPreviewView.ts

@@ -1,5 +1,6 @@
 import { YTNode } from '../helpers.js';
-import type { RawNode } from '../index.js';
+import { Parser, type RawNode } from '../index.js';
+import EngagementPanelSectionList from './EngagementPanelSectionList.js';
 import Text from './misc/Text.js';
 
 export default class DescriptionPreviewView extends YTNode {
@@ -9,6 +10,16 @@ export default class DescriptionPreviewView extends YTNode {
   max_lines: number;
   truncation_text: Text;
   always_show_truncation_text: boolean;
+  more_endpoint?: {
+    show_engagement_panel_endpoint: {
+      engagement_panel: EngagementPanelSectionList | null,
+      engagement_panel_popup_type: string;
+      identifier: {
+        surface: string,
+        tag: string
+      }
+    }
+  };
 
   constructor(data: RawNode) {
     super();
@@ -17,5 +28,20 @@ export default class DescriptionPreviewView extends YTNode {
     this.max_lines = parseInt(data.maxLines);
     this.truncation_text = Text.fromAttributed(data.truncationText);
     this.always_show_truncation_text = !!data.alwaysShowTruncationText;
+
+    if (data.rendererContext.commandContext?.onTap?.innertubeCommand?.showEngagementPanelEndpoint) {
+      const endpoint = data.rendererContext.commandContext?.onTap?.innertubeCommand?.showEngagementPanelEndpoint;
+
+      this.more_endpoint = {
+        show_engagement_panel_endpoint: {
+          engagement_panel: Parser.parseItem(endpoint.engagementPanel, EngagementPanelSectionList),
+          engagement_panel_popup_type: endpoint.engagementPanelPresentationConfigs.engagementPanelPopupPresentationConfig.popupType,
+          identifier: {
+            surface: endpoint.identifier.surface,
+            tag: endpoint.identifier.tag
+          }
+        }
+      };
+    }
   }
 }

src/parser/youtube/Channel.ts

@@ -196,10 +196,13 @@ export default class Channel extends TabbedFeed<IBrowseResponse> {
     if (this.hasTabWithURL('about')) {
       const tab = await this.getTabByURL('about');
       return tab.memo.getType(ChannelAboutFullMetadata)[0];
-    } else if (this.header?.is(C4TabbedHeader) && this.header.tagline) {
+    }
+
+    const tagline = this.header?.is(C4TabbedHeader) && this.header.tagline;
 
-      if (this.header.tagline.more_endpoint instanceof NavigationEndpoint) {
-        const response = await this.header.tagline.more_endpoint.call(this.actions);
+    if (tagline || this.header?.is(PageHeader) && this.header.content?.description) {
+      if (tagline && tagline.more_endpoint instanceof NavigationEndpoint) {
+        const response = await tagline.more_endpoint.call(this.actions);
 
         const tab = new TabbedFeed<IBrowseResponse>(this.actions, response, false);
         return tab.memo.getType(ChannelAboutFullMetadata)[0];
@@ -271,7 +274,9 @@ export default class Channel extends TabbedFeed<IBrowseResponse> {
 
   get has_about(): boolean {
     // Game topic channels still have an about tab, user channels have switched to the popup
-    return this.hasTabWithURL('about') || !!(this.header?.is(C4TabbedHeader) && this.header.tagline?.more_endpoint);
+    return this.hasTabWithURL('about') ||
+      !!(this.header?.is(C4TabbedHeader) && this.header.tagline?.more_endpoint) ||
+      !!(this.header?.is(PageHeader) && this.header.content?.description?.more_endpoint);
   }
 
   get has_search(): boolean {