bots/src/agents/video-streams/index.ts

import { type Handler } from "aws-lambda";
import { createRestAPIClient, mastodon } from "masto";
import { CronJob } from "cron";

import Scraper from "../../utils/scraper";
import ScraperMethods from "../../enums/scraper-methods";
import Emojis from "../../enums/emojis";
import LogLevels from "../../enums/log-levels";
import config from "../../config";

interface IStreamConfig {
  id: number;
  location: string;
  url: string;
  hashtags: string[];
  screenshotSelector?: string;
  clickSelector?: string;
  screenshotDelay?: number;
}

export default class VideoStreams {
  private readonly _name: string = "Video Streams";
  private readonly _mastodonClient: mastodon.rest.Client;
  private readonly _scraper: Scraper;
  private readonly _defaultLocation: string = "Transmisión en vivo";

  constructor(accessToken = config.MASTODON_TEST_ACCESS_TOKEN) {
    accessToken = config.DEVELOP ? config.MASTODON_TEST_ACCESS_TOKEN : accessToken;
    this._mastodonClient = createRestAPIClient({ url: config.MASTODON_URL, accessToken });
    this._scraper = new Scraper();
  }

  private parseStreams(): IStreamConfig[] {
    const streamsString = config.VIDEO_STREAMS;
    if (!streamsString || streamsString.trim() === "") {
      return [];
    }

    try {
      const parsed = JSON.parse(streamsString);
      if (!Array.isArray(parsed)) {
        throw new Error("VIDEO_STREAMS must be a JSON array");
      }

      let id = 1;
      const streams: IStreamConfig[] = [];

      parsed.forEach((item: any) => {
        const location = String(item.location ?? "").trim();
        const url = String(item.url ?? "").trim();

        if (url === "") {
          return;
        }

        streams.push({
          id: id++,
          location,
          url,
          hashtags: Array.isArray(item.hashtags)
            ? item.hashtags.map((h: unknown) => String(h).trim()).filter((h: string) => h !== "")
            : [],
          screenshotSelector: item.screenshotSelector !== undefined ? String(item.screenshotSelector).trim() : undefined,
          clickSelector: item.clickSelector !== undefined ? String(item.clickSelector).trim() : undefined,
          screenshotDelay: item.screenshotDelay !== undefined ? Number(item.screenshotDelay) : undefined
        });
      });

      return streams;
    } catch (err: any) {
      console.error(`${this._name} | Error parsing VIDEO_STREAMS: ${err.message}`);
      throw err;
    }
  }

  private base64ToFile(base64: string, fileName: string): File {
    const buffer = Buffer.from(base64, "base64");
    return new File([buffer], fileName, { type: "image/png" });
  }

  private generateUniqueTag(id: number): string {
    return `EnVivoCL_${String(id).padStart(3, "0")}`;
  }

  private buildMessage(stream: IStreamConfig): string {
    const location = stream.location !== "" ? stream.location : this._defaultLocation;
    const uniqueTag = this.generateUniqueTag(stream.id);
    const tags = [uniqueTag, ...stream.hashtags];

    let message = `${Emojis.VIDEO_CAMERA} Transmisión en vivo desde ${location}`;
    message += `\n\n${Emojis.LINK} ${stream.url}`;

    if (tags.length > 0) {
      message += `\n\n${tags.map((hashtag) => `#${hashtag}`).join(" ")}`;
    }

    return message;
  }

  private async publish(stream: IStreamConfig, screenshotBase64: string): Promise<void> {
    try {
      const media = await this._mastodonClient.v2.media.create({
        file: this.base64ToFile(screenshotBase64, `${stream.location.replace(/\s+/g, "_")}.png`),
        description: `Transmisión en vivo desde ${stream.location}`
      });

      const message = this.buildMessage(stream);

      console.log(`\n${this._name} | Sending\n`, message);

      await this._mastodonClient.v1.statuses.create({ status: message, mediaIds: [media.id] });
    } catch (err: any) {
      console.error(`${this._name} | Error publishing stream ${stream.location}`);
      console.error(err.message);
    }
  }

  public async run(event?: any, context?: any): Promise<void> {
    try {
      const streams = this.parseStreams();

      if (streams.length === 0) {
        console.log(`${this._name} | No streams configured`);
        return;
      }

      console.log(`${this._name} | Found ${streams.length} stream(s)`);

      for (const stream of streams) {
        console.log(`${this._name} | Capturing ${stream.location}`);

        const scrapeOptions: any = {
          url: stream.url,
          scraperMethod: ScraperMethods.PUPPETEER,
          screenshotDelay: stream.screenshotDelay ?? config.VIDEO_STREAMS_SCREENSHOT_DELAY
        };

        if (stream.screenshotSelector !== undefined && stream.screenshotSelector !== "") {
          scrapeOptions.screenshot = true;
          scrapeOptions.screenshotSelector = stream.screenshotSelector;
        }

        if (stream.clickSelector !== undefined && stream.clickSelector !== "") {
          scrapeOptions.clickSelector = stream.clickSelector;
        }

        const response = await this._scraper.scrape(scrapeOptions);

        const screenshotBase64 = response?.data?.data?.screenshot;

        if (!screenshotBase64 || typeof screenshotBase64 !== "string") {
          console.log(`${this._name} | No screenshot obtained for ${stream.location}`);
          continue;
        }

        await this.publish(stream, screenshotBase64);
      }

      console.log(`${this._name} | Finished`);
    } catch (err: any) {
      console.log(`${this._name} | An error has occurred\n`);
      console.error(err.message);
      if (config.LOG_LEVEL === LogLevels.DEBUG) {
        if (event !== undefined) {
          console.debug("\nEvent\n");
          console.debug(event);
        }

        if (context !== undefined) {
          console.debug("\nContext\n");
          console.debug(context);
        }
      }
    }
  }

  public getHandler(): Handler {
    return async (event, context) => {
      await this.run(event, context);
    };
  }
}

try {
  const videoStreams = new VideoStreams(config.DEVELOP ? config.MASTODON_TEST_ACCESS_TOKEN : config.MASTODON_KEY_VIDEO_STREAMS);
  new CronJob(
    "0 0 * * * *",
    () => videoStreams.run(),
    null,
    true,
    config.DEFAULT_TIMEZONE
  );

  if (config.DEVELOP) {
    videoStreams.run();
  }
} catch (error) {
  console.error(error);
}