Download images from the given Facebook posts

download_fb_post_images.py

import operator

import requests


API_URL = "https://graph.facebook.com/v15.0/"
TOKEN = ""
PAGE_ID = ""
# {"post_id": "folder name"}
POST_IDS = {}


def process_photos(folder_name, resp_data):
    photos = (
        subattachment["target"]["id"]
        for attachment in resp_data["attachments"]["data"]
        for subattachment in attachment.get("subattachments", {}).get("data", [])
    )
    for idx, photo_id in enumerate(photos, start=1):
        print("Processing photo with ID", photo_id)
        resp = session.get(
            f"{API_URL}{photo_id}", params={"fields": "images", "access_token": TOKEN}
        )
        resp.raise_for_status()
        image = max(resp.json()["images"], key=operator.itemgetter("width"))
        with open(f"{folder_name}/{idx}.jpg", "wb") as fp:
            with session.get(image["source"], stream=True) as resp:
                resp.raise_for_status()
                for chunk in resp.iter_content(chunk_size=128):
                    fp.write(chunk)


def main() -> int:
    with requests.Session() as session:
        for post_id, folder_name in POST_IDS.items():
            print("--- Processing post with ID", post_id)
            full_post_id = f"{PAGE_ID}_{post_id}"
            resp = session.get(
                f"{API_URL}{full_post_id}",
                params={
                    "fields": "attachments{subattachments.limit(100){target{id}}}",
                    "access_token": access_token,
                },
            )
            resp.raise_for_status()
            folder_name = folder_name or full_post_id
            process_photos(full_post_id, resp.json())

    return 0


if __name__ == "__main__":
    raise SystemExit(main())