Files
siftlode/backend/tests/test_facebook_impersonation.py
T
peter e7e8d8236e fix(downloads): the egress filter keeps what yt-dlp fetches itself, and shows no phase
f4m, ism, a bare m3u8 (native under hls_prefer_native) and the DASH generator fetch through the
proxy, but were dropped as if ffmpeg dialled them. The filter also took the job's postprocessor
hook, twice, and painted every guarded job "processing" before a byte arrived. Tests now hold an
allowed tunnel, the worker's own gate, the single-URL branch, and that the pipeline and the
backfill turn the gate on while YouTube does not.
2026-11-07 21:48:38 +01:00

257 lines
10 KiB
Python

"""The Facebook download path with the user's cookie.
Measured on dev (yt-dlp 2026.07.04, the owner's cookie): reel 806379462330494 fails with the cookie
alone and extracts 2560p with `--impersonate chrome`; the reels that already download with the cookie
keep their plain first attempt. These pin the attempt order through the real download loop
(`pipeline._extract_with_fallback`, with yt-dlp faked at the `YoutubeDL` boundary), and that the
LOCKED curl_cffi can actually impersonate — the pair only works inside yt-dlp's own version range, and
outside it every target silently reports "unavailable".
Measured on dev and in the owner's Chrome: given a group post's link, yt-dlp finds no formats or
downloads another video from the page's feed. The post's own video is the single Video node in the
page scripts that carry the post id (prod posts 66, 145, 140, 143, 221; text posts have none while the
page holds ~10 other videos), and its watch link downloads.
"""
import pytest
import yt_dlp
from yt_dlp.networking.exceptions import TransportError
from yt_dlp.networking.impersonate import ImpersonateTarget
from app.downloads import adapters, egress, pipeline
from app.downloads import errors as dlerrors
_URL = "https://www.facebook.com/reel/806379462330494/?fs=e&fs=e"
_POST = "1755988225525547"
_GROUP_LINK = f"https://www.facebook.com/groups/983554479435596/permalink/{_POST}/?"
_POST_VIDEO = "1408015447857753"
_FEED_VIDEO = "1056963063816966" # what yt-dlp downloaded from this post's link: a feed video
_CHROME = ImpersonateTarget.from_str("chrome")
def _video_node(video_id: str) -> str:
# The measured shape of a post's attachment in the page JSON.
return '{"media":{"__typename":"Video","id":"%s","__isNode":"Video"},"styles":{}}' % video_id
def _page(*post_videos: str, post: str = _POST) -> str:
attachments = ",".join(_video_node(v) for v in post_videos)
return (
'<html><script type="application/json" data-sjs>'
f'{{"post_id":"{post}","creation_time":1785084554,"attachments":[{attachments}]}}</script>'
'<script type="application/json" data-sjs>'
f'{{"feed":[{_video_node(_FEED_VIDEO)}]}}</script></html>'
)
_WALL = (
"ERROR: [facebook] 806379462330494: Cannot parse data; please report this issue on "
"https://github.com/yt-dlp/yt-dlp/issues?q= , filling out the appropriate issue template."
)
_NO_FORMATS = "ERROR: [facebook] 2541212983053999: No video formats found!"
def test_the_locked_curl_cffi_can_impersonate_chrome():
# YoutubeDL refuses to start when the target is unavailable — the same check a download makes.
with yt_dlp.YoutubeDL({"impersonate": ImpersonateTarget.from_str("chrome"), "quiet": True}):
pass
@pytest.fixture
def ydl(monkeypatch):
"""Fake `yt_dlp.YoutubeDL`: records each attempt's options and plays back `outcomes` in order;
`web["page"]` is what a page read returns (`web["fail"]`, when set, is raised instead), and `web`
records the pages opened, the byte cap each read asked for, and the links extracted."""
seen: list[dict] = []
outcomes: list = []
web: dict = {"page": "", "fail": None, "opened": [], "reads": [], "extracted": []}
class FakeYDL:
def __init__(self, opts):
seen.append(opts)
def __enter__(self):
return self
def add_post_processor(self, pp, when="post_process"):
pass # the egress format filter; nothing here to filter
def __exit__(self, *exc):
return False
def urlopen(self, url):
web["opened"].append(url)
if web["fail"] is not None:
raise web["fail"]
body = web["page"].encode()
class Response:
def read(self, amt=None):
web["reads"].append(amt)
return body
return Response()
def extract_info(self, url, download):
web["extracted"].append(url)
outcome = outcomes.pop(0)
if isinstance(outcome, str):
raise yt_dlp.utils.DownloadError(outcome)
return outcome
monkeypatch.setattr(pipeline.yt_dlp, "YoutubeDL", FakeYDL)
monkeypatch.setattr(pipeline, "_touch_job", lambda job_id: None)
monkeypatch.setattr(pipeline, "_set_job", lambda job_id, **fields: None)
return seen, outcomes, web
def _run(tmp_path, cookiefile, url=_URL):
return pipeline._extract_with_fallback(
1, 1, url, {}, tmp_path, adapters.FacebookAdapter(), cookiefile=cookiefile
)
def test_a_cookie_download_at_the_wall_is_retried_as_chrome(ydl, tmp_path):
seen, outcomes, web = ydl
outcomes += [_WALL, {"id": "806379462330494"}]
assert _run(tmp_path, "/cookies.txt") == {"id": "806379462330494"}
assert [o.get("impersonate") for o in seen] == [None, _CHROME]
assert all(o["cookiefile"] == "/cookies.txt" for o in seen) # the retry stays signed in
assert web["opened"] == [] # a reel is not a group post: no page read
def test_without_a_cookie_the_wall_is_the_login_wall_and_final(ydl, tmp_path):
seen, outcomes, _ = ydl
outcomes += [_WALL]
with pytest.raises(yt_dlp.utils.DownloadError):
_run(tmp_path, None)
assert len(seen) == 1 and "impersonate" not in seen[0]
def test_other_facebook_failures_are_not_retried_as_chrome(ydl, tmp_path):
seen, outcomes, _ = ydl
outcomes += [_NO_FORMATS]
with pytest.raises(yt_dlp.utils.DownloadError):
_run(tmp_path, "/cookies.txt")
assert len(seen) == 1 and "impersonate" not in seen[0]
# --- a group post downloads ITS video, or fails saying it has none --------------------------------
def test_a_cookie_group_post_downloads_the_posts_own_video(ydl, tmp_path):
seen, outcomes, web = ydl
web["page"] = _page(_POST_VIDEO)
outcomes += [_WALL, {"id": _POST_VIDEO}] # the watch link needs Chrome too (measured)
assert _run(tmp_path, "/cookies.txt", _GROUP_LINK) == {"id": _POST_VIDEO}
assert web["opened"] == [_GROUP_LINK]
# Never an unbounded read.
assert web["reads"] == [adapters.FacebookAdapter._POST_PAGE_MAX_BYTES]
assert seen[0]["cookiefile"] == "/cookies.txt" # the post page is read signed in
watch = f"https://www.facebook.com/watch/?v={_POST_VIDEO}"
# Never the post link: that is where the feed video comes from.
assert web["extracted"] == [watch, watch]
assert [o.get("impersonate") for o in seen[1:]] == [None, _CHROME]
# The post page read and both attempts all go through the egress gate.
assert all(o.get(egress.GUARDED) and o["proxy"] == egress.proxy_url() for o in seen), seen
def test_a_youtube_download_skips_the_gate(ydl, tmp_path):
seen, outcomes, _ = ydl
outcomes += [{"id": "dQw4w9WgXcQ"}]
yt = adapters.resolve_adapter("youtube", "dQw4w9WgXcQ")
pipeline._extract_with_fallback(1, 1, "https://youtu.be/dQw4w9WgXcQ", {}, tmp_path, yt)
assert seen and not any(o.get(egress.GUARDED) or o.get("proxy") for o in seen)
def test_a_group_post_without_a_single_video_fails_saying_so(ydl, tmp_path):
_, _, web = ydl
web["page"] = _page() # a text post: the only video on the page is the feed's
with pytest.raises(RuntimeError) as exc:
_run(tmp_path, "/cookies.txt", _GROUP_LINK)
assert web["extracted"] == [] # yt-dlp is not left to guess from the post link
assert dlerrors.diagnose(str(exc.value), url=_GROUP_LINK, cookie_attached=True) == (
"format_unavailable",
"facebook.group_post_video",
)
def test_a_group_post_page_without_the_post_is_the_refused_cookie(ydl, tmp_path):
# Measured with a refused cookie: Facebook answers the post link with its login page —
# a login form, no post id anywhere. Saying "this post has no video" would blame the post.
_, _, web = ydl
web["page"] = '<html><title>ChatGPT magyarul</title><form id="login_form"></form></html>'
with pytest.raises(RuntimeError) as exc:
_run(tmp_path, "/cookies.txt", _GROUP_LINK)
assert web["extracted"] == []
assert dlerrors.diagnose(str(exc.value), url=_GROUP_LINK, cookie_attached=True) == (
"login_required",
"facebook.cookie_rejected",
)
def test_a_failed_post_page_read_fails_the_download_as_itself(ydl, tmp_path):
# A read that failed says nothing about the post: it must not turn into "no video in this post".
_, _, web = ydl
web["fail"] = TransportError("Connection reset by peer")
with pytest.raises(TransportError) as exc:
_run(tmp_path, "/cookies.txt", _GROUP_LINK)
assert web["extracted"] == []
assert dlerrors.diagnose(str(exc.value), url=_GROUP_LINK, cookie_attached=True) == (
"network",
None,
)
def test_without_a_cookie_the_group_post_link_goes_to_ytdlp_unchanged(ydl, tmp_path):
_, outcomes, web = ydl
outcomes += [_NO_FORMATS]
with pytest.raises(yt_dlp.utils.DownloadError):
_run(tmp_path, None, _GROUP_LINK)
assert web["opened"] == [] # signed out the page is the login wall: nothing to read
assert web["extracted"] == [_GROUP_LINK]
def test_the_group_post_link_forms_are_recognised():
for url in (
_GROUP_LINK,
f"https://www.facebook.com/groups/983554479435596/posts/{_POST}/",
f"https://m.facebook.com/groups/983554479435596/permalink/{_POST}/?",
f"https://www.facebook.com/groups/chatgptmagyarul/posts/{_POST}",
):
assert adapters.facebook_group_post_id(url) == _POST, url
for url in (
_URL,
f"https://www.facebook.com/watch/?v={_POST_VIDEO}",
f"https://facebook.com.evil/groups/x/permalink/{_POST}/",
"https://www.facebook.com/groups/983554479435596/",
):
assert adapters.facebook_group_post_id(url) is None, url
assert adapters.SourceAdapter().resolve_url(_GROUP_LINK, {"cookiefile": "/c"}) == _GROUP_LINK
def test_only_the_single_video_of_the_posts_own_blocks_counts():
assert adapters.facebook_post_video_id(_page(_POST_VIDEO), _POST) == _POST_VIDEO
# No video in the post, although the page has one elsewhere.
assert adapters.facebook_post_video_id(_page(), _POST) is None
# Two videos: guessing between them would be the wrong-video bug again.
assert adapters.facebook_post_video_id(_page(_POST_VIDEO, "2063302677911049"), _POST) is None
# A longer number that merely STARTS with the post id is another object.
assert adapters.facebook_post_video_id(_page(_POST_VIDEO, post=_POST + "0"), _POST) is None