its like quite bespoke spelling, but ive been digging in this SDK for a while :)

quote_with_image.py

import httpx
from atproto import Client, models
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """set the following in your .env file
    BSKY_USERNAME=your_username
    BSKY_PASSWORD=your_password
    """

    model_config = SettingsConfigDict(env_file='.env')

    bsky_username: str
    bsky_password: str


settings = Settings()  # type: ignore[call-arg]
DEFAULT_IMAGE_URL = 'https://cdn.bsky.app/img/feed_fullsize/plain/did:plc:xbtmt2zjwlrfegqvch7fboei/bafkreiae4rcokecag5qlpvg6l3otzulqn3hllnazmz2ezyqfl6xzpy5noe@jpeg'


def main(
    user_to_quote: str,
    post_to_quote: str,
    message: str = 'Check this out!',
    image_url: str = DEFAULT_IMAGE_URL,
    image_path: str | None = None,
    image_alt: str = '',
    image_aspect_ratio: tuple[int, int] = (1, 1),  # width, height
) -> None:
    """Post an image while quoting another post."""

    if bool(image_url) == bool(image_path):
        raise ValueError('Exactly one of image_url or image_path must be provided')

    client = Client()
    client.login(settings.bsky_username, settings.bsky_password)

    if image_path:
        with open(image_path, 'rb') as f:
            img_data = f.read()
    else:
        assert image_url is not None, 'image_url must be provided'  # noqa: S101
        img_data = httpx.get(image_url).content

    if len(img_data) > 1_000_000:
        raise ValueError(f'Image must be under 1MB. Got {len(img_data) / 1_000_000:.1f}MB')

    uploaded_blob = client.upload_blob(img_data).blob

    handle_response = client.resolve_handle(user_to_quote)
    quote_post_uri = f'at://{handle_response.did}/app.bsky.feed.post/{post_to_quote}'
    quoted_post = client.get_post(post_rkey=post_to_quote, profile_identify=handle_response.did)
    assert quoted_post.cid is not None, 'Quoted post CID is required'  # noqa: S101

    client.send_post(
        text=message,
        embed=models.AppBskyEmbedRecordWithMedia.Main(
            record=models.AppBskyEmbedRecord.Main(
                record=models.ComAtprotoRepoStrongRef.Main(
                    uri=quote_post_uri,
                    cid=quoted_post.cid,
                )
            ),
            media=models.AppBskyEmbedImages.Main(
                images=[
                    models.AppBskyEmbedImages.Image(
                        image=uploaded_blob,
                        alt=image_alt,
                        aspect_ratio=models.AppBskyEmbedDefs.AspectRatio(
                            width=image_aspect_ratio[0], height=image_aspect_ratio[1]
                        ),
                    )
                ]
            ),
        ),
    )


if __name__ == '__main__':
    # Example usage
    main(
        user_to_quote='alternatebuild.dev',
        post_to_quote='3lbydu5wsdk2h',
        message='I scorn you! (from the atproto python client)',
        image_alt='cat with a condescending glare',
    )