bvandeusen
96c29c370b
Render a post body faithfully by serving our stored copies of inline images instead of hotlinking the public CDN. The join key is the CDN filehash (32-hex MD5) shared between a body <img src> and the media URL we downloaded (the same identity extract_media dedups by): - utils.paths.filehash_from_url — one source of truth for the extractor; patreon_client._filehash now delegates so capture- and render-time hashing cannot drift. - ImageRecord gains source_url (provenance) + source_filehash (indexed match key); migration 0051. - the per-media sidecar carries the file's source_url; the importer persists it (NULL-only) on the ImageRecord via _apply_sidecar. - post_feed_service.get_post remaps body <img src> -> /images/<path> for every inline image whose filehash maps to a stored image of THIS artist; unmatched / pre-Phase-2 images keep hotlinking. Pre-existing on-disk images have no filehash yet, so they fall back to hotlinking until re-downloaded; localization is forward-looking. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
561 lines
24 KiB
Python
561 lines
24 KiB
Python
"""Native Patreon media downloader (build step 2b of the native ingester).
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Given a Patreon post and its already-resolved `MediaItem`s (from
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patreon_client.extract_media), download the media to the EXACT on-disk layout
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gallery-dl produces, write a sidecar JSON the existing importer consumes, and
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report per-media outcomes.
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This module is PURE: no DB. The cross-run seen-ledger and the iter_posts
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orchestration are a LATER step. The tier-1 (seen) skip is an INJECTED predicate
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(`is_seen`), so this module needs no DB and is unit-testable without network.
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On-disk layout (matches gallery-dl):
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<images_root>/<artist_slug>/patreon/<DIR>/<NN>_<filename>
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where <DIR> = "<YYYY-MM-DD>_<post_id>_<title40>" (date prefix omitted when the
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post's published_at is unparseable), <NN> is the 1-based index of the item in
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the post zero-padded to 2, and <filename> is MediaItem.filename. The sidecar
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is written next to the media as <NN>_<stem>.json (media_path.with_suffix).
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Video: a MediaItem whose URL is a Mux/HLS stream (host stream.mux.com or path
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endswith .m3u8) is fetched with yt-dlp (subprocess), passing the same
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Referer/Origin headers gallery-dl forwards for Mux playback (see gallery_dl.py
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_get_default_config). yt-dlp may remux to a container of its own choosing, so we
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accept the actual output extension and record the real path.
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FC runs on a plain-HTTP homelab; nothing here uses a secure-context Web API.
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"""
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from __future__ import annotations
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import contextlib
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import json
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import logging
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import os
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import subprocess
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import time
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from collections.abc import Callable
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from dataclasses import dataclass
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from datetime import datetime
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from pathlib import Path
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from urllib.parse import urlsplit
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import requests
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from .file_validator import is_validatable, quarantine_file, validate_file
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from .patreon_client import (
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_BACKOFF_CAP_SECONDS,
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_load_session,
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_retry_after_seconds,
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)
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log = logging.getLogger(__name__)
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_TITLE_MAX = 40
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_TIMEOUT_SECONDS = 120.0
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_CHUNK = 1 << 16
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# Retry a media GET that hits a TRANSIENT failure within the same pass (plan
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# #705 #8): a transport blip (connection reset / timeout / truncated stream), a
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# 429, or a 5xx. PERMANENT failures (404 gone, 403 forbidden) fail fast straight
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# to the error/dead-letter path — no point re-fetching them. Keeps a momentary
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# network hiccup from becoming a per-item error that waits for the next walk.
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_MAX_MEDIA_RETRIES = 3
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# requests transport errors worth retrying (vs. an HTTPError, which is a real
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# server response and is classified by status code).
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_TRANSIENT_TRANSPORT_EXC = (
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requests.ConnectionError,
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requests.Timeout,
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requests.exceptions.ChunkedEncodingError,
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)
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# Referer/Origin yt-dlp must send for Mux-hosted Patreon video. Mux's JWT
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# playback policy checks Referer/Origin on every request, so yt-dlp must send
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# Patreon's, not its own default. (gallery-dl forwarded the same headers before
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# the #697 cutover removed its Patreon path; this is now the only place they
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# live.)
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_VIDEO_HEADERS = {
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"Referer": "https://www.patreon.com/",
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"Origin": "https://www.patreon.com",
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}
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# Characters Windows/gallery-dl path-restrict forbids, plus path separators.
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_FORBIDDEN = set('<>:"/\\|?*')
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def _sanitize(name: str) -> str:
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"""Make `name` safe for a single filesystem path segment.
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Replaces path separators, the Windows-forbidden set <>:"/\\|?* and control
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characters with `_`, then strips trailing dots/spaces (gallery-dl
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path-restrict behavior). Never returns empty (falls back to "_").
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"""
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out = []
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for ch in name:
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if ch in _FORBIDDEN or ord(ch) < 32:
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out.append("_")
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else:
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out.append(ch)
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cleaned = "".join(out).rstrip(". ")
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return cleaned or "_"
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def _is_video_url(url: str) -> bool:
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parts = urlsplit(url)
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if parts.hostname and parts.hostname.lower() == "stream.mux.com":
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return True
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return parts.path.lower().endswith(".m3u8")
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def _post_dir_name(post: dict) -> str:
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"""Build the post directory name matching gallery-dl's layout."""
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post_id = str(post.get("id") or "")
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attrs = post.get("attributes") or {}
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title = attrs.get("title")
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title = title if isinstance(title, str) else ""
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title40 = title[:_TITLE_MAX]
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published = attrs.get("published_at")
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date_prefix = None
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if isinstance(published, str) and published:
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s = published.strip()
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if s.endswith("Z"):
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s = s[:-1] + "+00:00"
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try:
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dt = datetime.fromisoformat(s)
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except ValueError:
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dt = None
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if dt is not None:
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date_prefix = f"{dt:%Y-%m-%d}"
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if date_prefix:
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raw = f"{date_prefix}_{post_id}_{title40}"
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else:
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raw = f"{post_id}_{title40}"
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return _sanitize(raw)
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@dataclass
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class MediaOutcome:
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"""Per-media result of a download_post pass.
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status is one of: "downloaded", "skipped_seen", "skipped_disk",
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"quarantined", "error". `path` is the final on-disk path for "downloaded"
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(the actual yt-dlp output for video), the path that already existed for
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"skipped_disk", or the _quarantine destination for "quarantined"; None for
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"skipped_seen" and (usually) "error". `error` carries the failure/validation
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reason for "error"/"quarantined", else None.
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"""
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media: object # MediaItem (avoid importing the name for a bare annotation)
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status: str
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path: Path | None
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error: str | None
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class PatreonDownloader:
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"""Download resolved Patreon media to gallery-dl's on-disk layout.
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PURE: no DB. The HTTP session and the yt-dlp invocation are injectable seams
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so tests run without network or a real subprocess:
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- pass `session=` to stub `session.get`, or monkeypatch `_fetch_to_file`.
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- monkeypatch `_run_ytdlp` to avoid spawning yt-dlp.
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"""
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def __init__(
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self,
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images_root: Path,
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cookies_path: str | None = None,
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*,
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validate: bool = True,
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rate_limit: float = 0.0,
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session: requests.Session | None = None,
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content_fetcher: Callable[[str], str | None] | None = None,
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):
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self.images_root = Path(images_root)
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self.cookies_path = str(cookies_path) if cookies_path else None
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self._validate = validate
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# Best-effort enrichment seam: (post_id) -> full HTML body, or None. The
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# feed endpoint often omits `content`; the adapter wires this to
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# PatreonClient.fetch_post_detail_content so the sidecar captures the
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# real body (formatting + inline <img> + external <a href> links).
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# None in unit tests / when enrichment isn't wanted.
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self._content_fetcher = content_fetcher
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# Politeness: seconds to sleep before each actual media download (paces
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# the CDN; honors ImportSettings.download_rate_limit_seconds, the same
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# value gallery-dl used as its between-downloads `sleep`). 0 = no pacing.
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# Applied only to real downloads, not to seen/disk skips. plan #703.
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self._rate_limit = rate_limit or 0.0
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# Build a cookie-loaded session the same way patreon_client does, so the
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# CDN GETs carry the creator's auth.
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self.session = session if session is not None else _load_session(cookies_path)
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# -- public ------------------------------------------------------------
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def download_post(
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self,
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post: dict,
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media_items: list,
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artist_slug: str,
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*,
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is_seen: Callable[[object], bool] = lambda m: False,
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should_stop: Callable[[], bool] = lambda: False,
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) -> list[MediaOutcome]:
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"""Download every media item of one post; return per-item outcomes.
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Builds the post directory, iterates media (1-based NN), applies the
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two-tier skip (injected is_seen, then disk), downloads (plain GET or
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yt-dlp for video), writes the sidecar for each freshly-downloaded item,
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validates, and returns outcomes. Resilient: one media's failure yields
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an "error" outcome for that item; the rest proceed.
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`should_stop()` is polled BEFORE each media item: a media-dense post can
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otherwise run a backfill chunk far past its time-box (the engine only
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re-checks the budget between posts), so we honour the deadline mid-post
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and return the items done so far — the rest re-fetch next chunk (they
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were never marked seen). Bounds chunk overrun to one media download.
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"""
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post_dir = self.images_root / artist_slug / "patreon" / _post_dir_name(post)
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outcomes: list[MediaOutcome] = []
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for i, media in enumerate(media_items, start=1):
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if should_stop():
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break
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try:
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outcomes.append(
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self._download_one(post, media, post_dir, artist_slug, i, is_seen)
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)
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except Exception as exc: # resilient: isolate one item's failure
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log.warning(
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"Patreon media failed (post %s, item %d): %s",
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post.get("id"), i, exc,
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)
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outcomes.append(
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MediaOutcome(media=media, status="error", path=None, error=str(exc))
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)
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return outcomes
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# -- per-item ----------------------------------------------------------
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def _download_one(
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self,
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post: dict,
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media,
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post_dir: Path,
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artist_slug: str,
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index: int,
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is_seen: Callable[[object], bool],
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) -> MediaOutcome:
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# tier-1: seen ledger (injected; no DB here).
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if is_seen(media):
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return MediaOutcome(media=media, status="skipped_seen", path=None, error=None)
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nn = f"{index:02d}"
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final_name = _sanitize(f"{nn}_{media.filename}")
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media_path = post_dir / final_name
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# tier-2: already on disk.
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if media_path.exists():
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return MediaOutcome(
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media=media, status="skipped_disk", path=media_path, error=None
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)
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# Video may land at a different extension; honor a pre-existing remux.
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if _is_video_url(media.url):
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existing = self._existing_video_output(media_path)
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if existing is not None:
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return MediaOutcome(
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media=media, status="skipped_disk", path=existing, error=None
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)
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post_dir.mkdir(parents=True, exist_ok=True)
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# Pace real downloads only (the skips above already returned). plan #703.
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if self._rate_limit > 0:
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time.sleep(self._rate_limit)
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if _is_video_url(media.url):
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out_path = self._run_ytdlp(media.url, media_path, _VIDEO_HEADERS)
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if out_path is None or not Path(out_path).exists():
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return MediaOutcome(
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media=media,
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status="error",
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path=None,
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error="yt-dlp produced no output",
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)
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out_path = Path(out_path)
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else:
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out_path = self._fetch_get(media.url, media_path)
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reason, quarantine_dest = self._validate_path(
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out_path, artist_slug, media.url
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)
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if reason is not None:
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# Quarantined (corrupt/invalid) — distinct from a download error
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# so the run can report a real files_quarantined count + paths.
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return MediaOutcome(
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media=media, status="quarantined",
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path=quarantine_dest, error=reason,
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)
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self._write_sidecar(post, out_path, source_url=media.url)
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return MediaOutcome(media=media, status="downloaded", path=out_path, error=None)
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# -- download seams ----------------------------------------------------
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def _fetch_get(self, url: str, dest: Path) -> Path:
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"""Stream `url` to a .part file then atomic-rename to `dest`.
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Thin wrapper over `_fetch_to_file` so tests can stub either the whole
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GET path (`_fetch_to_file`) or just `session.get`.
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"""
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part = dest.with_name(dest.name + ".part")
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try:
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self._fetch_to_file(url, part)
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except Exception:
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with contextlib.suppress(OSError):
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part.unlink()
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raise
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os.replace(part, dest)
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return dest
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def _fetch_to_file(self, url: str, dest: Path) -> None:
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"""Stream a non-video URL to `dest` via the (stubbable) session, retrying
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TRANSIENT failures within the same pass (plan #705 #8) and RESUMING from
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the bytes already on disk via a Range request when a retry follows a
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mid-download cut (plan #708 B5).
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Retried (backoff): transport blips (connection reset / timeout /
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truncated stream — incl. mid-download), HTTP 429 (honoring Retry-After),
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and 5xx. Failed fast (no retry → HTTPError → per-item error → dead-letter
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path): 4xx other than 429 (404 gone, 403 forbidden) — re-fetching a
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permanent failure is pointless.
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Resume: on a retry, if bytes already landed in `dest`, ask for the rest
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with `Range: bytes=<have>-`. A 206 means the server honored it → append; a
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200 means it ignored it (served the whole file) → start clean. The caller
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(_fetch_get) stages into a `.part`, so a non-range server never corrupts
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the output — the worst case is re-downloading from zero, as before.
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"""
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attempt = 0
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while True:
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have = dest.stat().st_size if dest.exists() else 0
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headers = {"Range": f"bytes={have}-"} if have > 0 else None
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try:
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resp = self.session.get(
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url, stream=True, timeout=_TIMEOUT_SECONDS, headers=headers,
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)
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if (resp.status_code == 429 or resp.status_code >= 500) \
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and attempt < _MAX_MEDIA_RETRIES:
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attempt += 1
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delay = _retry_after_seconds(resp, attempt)
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log.warning(
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"Patreon media transient HTTP %d (%s) — backing off "
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"%.1fs (retry %d/%d)",
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resp.status_code, url, delay, attempt, _MAX_MEDIA_RETRIES,
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)
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time.sleep(delay)
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continue
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# A Range that starts at/past EOF (we already have the whole file)
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# comes back 416 — the bytes we kept ARE the file.
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if have > 0 and resp.status_code == 416:
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return
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# 2xx → ok; 4xx-non-429 (or an exhausted 429/5xx) → HTTPError
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# (permanent for this pass) → not caught below → per-item error.
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resp.raise_for_status()
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# 206 → server honored the Range; append after the kept bytes.
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# Anything else (200) → it served the whole file → start clean.
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mode = "ab" if (have > 0 and resp.status_code == 206) else "wb"
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with open(dest, mode) as fh:
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for chunk in resp.iter_content(chunk_size=_CHUNK):
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if chunk:
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fh.write(chunk)
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return
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except _TRANSIENT_TRANSPORT_EXC as exc:
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if attempt >= _MAX_MEDIA_RETRIES:
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raise # exhausted → terminal error outcome
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attempt += 1
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delay = min(2.0 * (2 ** (attempt - 1)), _BACKOFF_CAP_SECONDS)
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log.warning(
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"Patreon media transport error (%s) — backing off %.1fs "
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"(retry %d/%d): %s",
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url, delay, attempt, _MAX_MEDIA_RETRIES, exc,
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)
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time.sleep(delay)
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def _run_ytdlp(self, url: str, dest: Path, headers: dict) -> Path | None:
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"""Invoke yt-dlp to fetch a Mux/HLS stream to (around) `dest`.
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Returns the actual output path (yt-dlp may remux to a different
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container, so we resolve the real file afterward). Overridden/
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monkeypatched in tests to avoid spawning a real subprocess.
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The output template uses `dest` without its extension; yt-dlp appends
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the chosen container extension. We pass Referer/Origin (Mux JWT policy)
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and the cookies file.
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Mirrors the GET path's transient/permanent split (plan #705 #8): a hung
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fetch (TimeoutExpired) or a spawn failure (OSError) is TRANSIENT — back
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off and retry. A non-zero yt-dlp exit (CalledProcessError) is treated as
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PERMANENT for this pass — yt-dlp already does its OWN internal network
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retries, so a non-zero exit is effectively a real failure (private/gone/
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geo-blocked), like a 4xx on the GET path: fail fast to the per-item error
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→ dead-letter path.
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"""
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dest = Path(dest)
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out_template = str(dest.with_suffix("")) + ".%(ext)s"
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cmd = ["yt-dlp", "--no-progress", "-o", out_template]
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for key, value in headers.items():
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cmd += ["--add-header", f"{key}:{value}"]
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if self.cookies_path and os.path.isfile(self.cookies_path):
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cmd += ["--cookies", self.cookies_path]
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cmd.append(url)
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attempt = 0
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while True:
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try:
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subprocess.run(
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cmd,
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check=True,
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capture_output=True,
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text=True,
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timeout=_TIMEOUT_SECONDS,
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)
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break
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except subprocess.CalledProcessError as exc:
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# Permanent for this pass — fail fast (no retry).
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log.warning(
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"yt-dlp failed (exit %s) for %s: %s",
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exc.returncode, url, (exc.stderr or "").strip() or exc,
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)
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return None
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except (OSError, subprocess.TimeoutExpired) as exc:
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# Transient — back off and retry, like a transport blip on a GET.
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if attempt >= _MAX_MEDIA_RETRIES:
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log.warning(
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"yt-dlp transient failure exhausted for %s: %s", url, exc
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)
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return None
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attempt += 1
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delay = min(2.0 * (2 ** (attempt - 1)), _BACKOFF_CAP_SECONDS)
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log.warning(
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"yt-dlp transient failure (%s) — backing off %.1fs "
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"(retry %d/%d): %s",
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url, delay, attempt, _MAX_MEDIA_RETRIES, exc,
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)
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time.sleep(delay)
|
|
return self._existing_video_output(dest)
|
|
|
|
def _existing_video_output(self, dest: Path) -> Path | None:
|
|
"""Find a yt-dlp output for `dest` regardless of chosen extension.
|
|
|
|
Returns `dest` itself if present, else any sibling sharing the same
|
|
stem (the remuxed container). None if nothing matched.
|
|
"""
|
|
dest = Path(dest)
|
|
if dest.exists():
|
|
return dest
|
|
stem = dest.with_suffix("").name
|
|
parent = dest.parent
|
|
if not parent.is_dir():
|
|
return None
|
|
for cand in sorted(parent.iterdir()):
|
|
if cand.is_file() and cand.stem == stem and cand.name != dest.name:
|
|
return cand
|
|
return None
|
|
|
|
# -- validation --------------------------------------------------------
|
|
|
|
def _validate_path(
|
|
self, path: Path, artist_slug: str, source_url: str | None = None
|
|
) -> tuple[str | None, Path | None]:
|
|
"""Validate a freshly-written file; quarantine if bad.
|
|
|
|
Uses the shared `file_validator.quarantine_file` — same move + provenance
|
|
sidecar gallery-dl writes (the native path used to skip the sidecar; that
|
|
parity gap is closed here). Returns `(reason, quarantine_dest)` when
|
|
quarantined (dest is the original path if the move itself failed), else
|
|
`(None, None)` (ok / not validatable / disabled). plan #704: the dest is
|
|
surfaced so the run reports a real quarantined-paths list.
|
|
"""
|
|
if not self._validate or not is_validatable(path):
|
|
return None, None
|
|
try:
|
|
result = validate_file(path)
|
|
except Exception as exc:
|
|
log.warning("Validator raised on %s: %s", path, exc)
|
|
return None, None
|
|
if result.ok:
|
|
return None, None
|
|
dest = quarantine_file(
|
|
self.images_root, path, artist_slug, "patreon",
|
|
url=source_url, result=result,
|
|
)
|
|
return (result.reason or "validation failed"), (dest or path)
|
|
|
|
# -- sidecar -----------------------------------------------------------
|
|
|
|
def _write_sidecar(
|
|
self, post: dict, media_path: Path, *, source_url: str | None = None
|
|
) -> Path:
|
|
"""Write the importer-consumed sidecar next to `media_path`.
|
|
|
|
Patreon uses base-default sidecar keys (parse_sidecar maps
|
|
category->platform, id->external_post_id, title->post_title,
|
|
content->description, published_at->post_date, url->post_url). Patreon
|
|
registers no derive_post_url, so `url` is trusted as the permalink — we
|
|
pass the post's attributes.url.
|
|
|
|
`source_url` is THIS file's CDN URL (#830 Phase 2). The importer persists
|
|
its filehash on the ImageRecord so the post body's inline `<img src>` can
|
|
be remapped to the local copy at render time.
|
|
"""
|
|
return self._write_sidecar_data(
|
|
post, media_path.with_suffix(".json"), source_url=source_url
|
|
)
|
|
|
|
def _write_sidecar_data(
|
|
self, post: dict, sidecar_path: Path, *, source_url: str | None = None
|
|
) -> Path:
|
|
"""Serialize the post's metadata to `sidecar_path`. Shared by the
|
|
per-media sidecar (next to each file) and the post-only sidecar
|
|
(`write_post_record`, for media-less posts). `source_url` is set only for
|
|
the per-media sidecar — a media-less post has no source file."""
|
|
attrs = post.get("attributes") or {}
|
|
title = attrs.get("title")
|
|
content = attrs.get("content")
|
|
# The feed/list endpoint frequently returns an empty `content`; the full
|
|
# HTML body (formatting + inline <img> + external <a href> links) only
|
|
# comes from the per-post detail endpoint. Enrich on first write for this
|
|
# post and MEMOIZE by mutating the shared `post` dict — so a multi-image
|
|
# post fetches detail exactly once, and a fully-seen post (no fresh
|
|
# download → no sidecar write) never pays the extra GET.
|
|
if (not isinstance(content, str) or not content.strip()) and self._content_fetcher:
|
|
fetched = self._content_fetcher(str(post.get("id") or ""))
|
|
if fetched:
|
|
attrs["content"] = fetched
|
|
post["attributes"] = attrs
|
|
content = fetched
|
|
published = attrs.get("published_at")
|
|
url = attrs.get("url")
|
|
data = {
|
|
"category": "patreon",
|
|
"id": str(post.get("id") or ""),
|
|
"title": title if isinstance(title, str) else "",
|
|
"content": content if isinstance(content, str) else "",
|
|
"published_at": published if isinstance(published, str) else None,
|
|
"url": url if isinstance(url, str) else None,
|
|
}
|
|
if source_url:
|
|
data["source_url"] = source_url
|
|
sidecar_path.write_text(json.dumps(data, indent=2))
|
|
return sidecar_path
|
|
|
|
def write_post_record(self, post: dict, artist_slug: str) -> Path | None:
|
|
"""Write a post-ONLY sidecar (no media file) for a media-less post, so
|
|
the importer can still upsert the Post + its body — text posts often hold
|
|
the only copy of an external <a href> link. Named `_post.json`: the
|
|
leading underscore keeps it from colliding with a media sidecar
|
|
(`<NN>_<stem>.json`) and from being resolved as some media file's sidecar
|
|
by find_sidecar. Returns the path, or None when the post has no id."""
|
|
if not str(post.get("id") or ""):
|
|
return None
|
|
post_dir = self.images_root / artist_slug / "patreon" / _post_dir_name(post)
|
|
post_dir.mkdir(parents=True, exist_ok=True)
|
|
return self._write_sidecar_data(post, post_dir / "_post.json")
|