makeEmbed.ts

export const makeEmbed = async (params: MakeEmbedParams) => {
  let { agent, imageUrl, imageAlt, encoding: imageFormat } = params;
  imageFormat = imageFormat || guessImageFormat(imageUrl)
  imageAlt = imageAlt || 'image'

  const check = fs.existsSync(imageUrl)
  if (!check) {
    const msg = `Unable to find image ${imageUrl}`;
    console.error(msg);
    // FIXME dont crash in prod env if an image is missing
    throw new Error(msg);
    // return
  }
  clog.log('file exists', { imageUrl, imageFormat })
  const data = fs.readFileSync(imageUrl);
  clog.log('read data', { length: data.length })

  const response = await agent.uploadBlob(
    data, { encoding: imageFormat }
  );
  clog.log('uploadBlob response', JSON.stringify(response, null, 2))

  if (!response.success) {
    const msg = `Unable to upload image ${imageUrl}`;
    console.error(msg, response);
    throw new Error(msg);
  }

  const { data: { blob: image } } = response;

  const embed: ImageEmbed = {
    $type: "app.bsky.embed.images",
    images: [
      {
        image,
        alt: imageAlt,
      },
    ],
  }

  return embed

}