fxtwitter-docker/src/render/photo.ts

import { Constants } from '../constants';
import { Strings } from '../strings';

export const renderPhoto = (
  properties: RenderProperties,
  photo: APIPhoto | APIMosaicPhoto
): ResponseInstructions => {
  const { tweet, engagementText, authorText, isOverrideMedia, userAgent } = properties;
  const instructions: ResponseInstructions = { addHeaders: [] };

  if (
    (tweet.media?.photos?.length || 0) > 1 &&
    (!tweet.media?.mosaic || isOverrideMedia)
  ) {
    photo = photo as APIPhoto;

    const all = tweet.media?.all as APIMedia[];
    const baseString =
      all.length === tweet.media?.photos?.length
        ? Strings.PHOTO_COUNT
        : Strings.MEDIA_COUNT;

    const photoCounter = baseString.format({
      number: String(all.indexOf(photo) + 1),
      total: String(all.length)
    });

    const isTelegram = (userAgent?.indexOf('Telegram') ?? 0) > -1;

    if (authorText === Strings.DEFAULT_AUTHOR_TEXT || isTelegram) {
      instructions.authorText = photoCounter;
    } else {
      instructions.authorText = `${authorText}${
        authorText ? '   ―   ' : ''
      }${photoCounter}`;
    }

    if (engagementText && !isTelegram) {
      instructions.siteName = `${Constants.BRANDING_NAME} - ${engagementText} - ${photoCounter}`;
    } else {
      instructions.siteName = `${Constants.BRANDING_NAME} - ${photoCounter}`;
    }
  }

  if (photo.type === 'mosaic_photo' && !isOverrideMedia) {
    instructions.addHeaders = [
      `<meta property="twitter:image" content="${tweet.media?.mosaic?.formats.jpeg}"/>`,
      `<meta property="og:image" content="${tweet.media?.mosaic?.formats.jpeg}"/>`
    ];
  } else {
    instructions.addHeaders = [
      `<meta property="twitter:image" content="${photo.url}"/>`,
      `<meta property="og:image" content="${photo.url}"/>`,
      `<meta property="twitter:image:width" content="${photo.width}"/>`,
      `<meta property="twitter:image:height" content="${photo.height}"/>`,
      `<meta property="og:image:width" content="${photo.width}"/>`,
      `<meta property="og:image:height" content="${photo.height}"/>`
    ];
  }

  console.log('Photo render instructions', JSON.stringify(instructions));

  return instructions;
};