YouTube.js/lib/parser/youtube/Comments.js

'use strict';

const Parser = require('..');
const { InnertubeError } = require('../../utils/Utils');

class Comments {
  #page;
  #actions;
  #continuation;

  constructor(actions, data, already_parsed = false) {
    this.#page = already_parsed ? data : Parser.parseResponse(data);
    this.#actions = actions;

    const contents = this.#page.on_response_received_endpoints;

    /** @type {import('../classes/comments/CommentsHeader')} */
    this.header = contents[0].contents.get({ type: 'CommentsHeader' });

    const threads = contents[1].contents?.findAll({ type: 'CommentThread' }) || [];

    /** @type {import('../classes/comments/CommentThread')[]} */
    this.contents = threads.map((thread) => {
      thread.comment.setActions(this.#actions);
      thread.setActions(this.#actions);
      return thread;
    });

    this.#continuation = contents[1].contents?.get({ type: 'ContinuationItem' }) || null;
  }

  /**
   * Creates a top-level comment.
   * @param {string} text
   * @returns {Promise.<{ success: boolean, status_code: number, data: object }>}
   */
  async comment(text) {
    const button = this.header.create_renderer.submit_button;

    const payload = {
      params: {
        commentText: text
      },
      parse: false
    };

    const response = await button.endpoint.callTest(this.#actions, payload);

    return response;
  }

  /**
   * Retrieves next batch of comments.
   * @returns {Promise.<Comments>}
   */
  async getContinuation() {
    if (!this.#continuation)
      throw new InnertubeError('Continuation not found');

    const data = await this.#continuation.endpoint.callTest(this.#actions);

    // Copy the previous page so we can keep the header.
    const page = Object.assign({}, this.#page);

    // Remove previous items and append the continuation.
    page.on_response_received_endpoints.pop();
    page.on_response_received_endpoints.push(data.on_response_received_endpoints[0]);

    return new Comments(this.#actions, page, true);
  }

  get page() {
    return this.#page;
  }
}

module.exports = Comments;