peter
b7a6451dba
5a — the public watch page rendered every asset in a <video>, but WebKit (all iOS browsers) refuses to play an audio-only mp3 in <video>, so shared audio links were broken on iPad while working on desktop Chromium. public_meta now flags audio-only assets (codec present, no video stream) and WatchPage renders a native <audio> in a padded surface card (no artwork exists for these). 5c — a login-walled Facebook post failed as a bare 'unknown', which offered a misleading Retry. Classify closed-group / cookie-suggestion auth walls as login_required and genuinely unsupported sites as a new unsupported_host class (both non-retryable), and drop unknown from the modal's retryable set — an unclassified failure is most often an unparsed auth wall. The queue row keeps its own force-retry for real transients.
104 lines
4.3 KiB
Python
104 lines
4.3 KiB
Python
"""Public "share by link" helpers for the download center.
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A DownloadLink is a capability URL: the unguessable `token` grants anyone read access to one
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download's file on the login-free `/watch/{token}` page. Password-protected links additionally
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require a short-lived signed **grant** on the file request — because a `<video src>` can't send a
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header, the password is exchanged once at `/unlock` for an HMAC grant appended to the file URL,
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so the raw password never rides in the media URL (or server logs).
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"""
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import hashlib
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import hmac
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import secrets
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from datetime import datetime, timezone
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from app.config import settings
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from app.models import DownloadLink
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_GRANT_TTL = 6 * 3600 # a watch session's grant is good for 6h, then the viewer re-unlocks
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def new_token() -> str:
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return secrets.token_urlsafe(24) # ~32 chars, 192 bits
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def is_expired(link: DownloadLink) -> bool:
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return link.expires_at is not None and link.expires_at <= datetime.now(timezone.utc)
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# --- signed grants (password-protected file access) ----------------------------------------
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def _sign(msg: str) -> str:
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return hmac.new(settings.secret_key.encode(), msg.encode(), hashlib.sha256).hexdigest()[:32]
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def make_grant(token: str, password_version: int, now: float | None = None) -> str:
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"""A short-lived HMAC grant proving the viewer unlocked `token`. Format: `<exp>.<sig>`. The
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link's current `password_version` is folded into the signature, so rotating the password (which
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bumps the version) invalidates every grant minted under the old password at once."""
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exp = int((now if now is not None else datetime.now(timezone.utc).timestamp())) + _GRANT_TTL
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return f"{exp}.{_sign(f'{token}.{exp}.{password_version}')}"
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def check_grant(token: str, grant: str | None, password_version: int) -> bool:
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"""Verify a grant against the link's CURRENT `password_version`; a version bump (password
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rotation) fails the signature check even before the grant's TTL expires."""
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if not grant or "." not in grant:
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return False
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exp_s, sig = grant.split(".", 1)
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try:
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exp = int(exp_s)
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except ValueError:
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return False
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if exp < datetime.now(timezone.utc).timestamp():
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return False
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return hmac.compare_digest(sig, _sign(f"{token}.{exp}.{password_version}"))
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# --- serialization -------------------------------------------------------------------------
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def owner_view(link: DownloadLink, base_url: str = "") -> dict:
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"""What the file owner sees when managing their links."""
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return {
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"id": link.id,
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"token": link.token,
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"url": f"{base_url}/watch/{link.token}",
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"allow_download": link.allow_download,
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"has_password": link.password_hash is not None,
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"expires_at": link.expires_at.isoformat() if link.expires_at else None,
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"view_count": link.view_count,
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"created_at": link.created_at.isoformat() if link.created_at else None,
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}
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def public_meta(
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link: DownloadLink, job, asset, file_url: str, poster_url: str | None = None
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) -> dict:
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"""Metadata for the public watch page (only ever returned once access is authorized).
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Resolves the owner's per-download display overrides (custom title/channel) over the asset's
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auto-extracted values, and surfaces the source + any extra reference links as clickable URLs."""
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from app.downloads import service
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source_url = service.reference_url(job, asset)
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# Audio-only assets (mp3 rips, extracted audio) carry a codec but no video stream. WebKit (all
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# iOS browsers) refuses to play them inside a <video> element, so the watch page must render a
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# native <audio> instead — flag it here from the recorded codecs (a real video always has vcodec).
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is_audio = asset.vcodec is None and asset.acodec is not None
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return {
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"title": (job and job.display_name) or asset.title,
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"uploader": (job and job.display_uploader) or asset.uploader,
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"uploader_url": (job and job.display_uploader_url) or asset.uploader_url,
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"source_url": source_url,
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"extra_links": (job and job.extra_links) or [],
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"duration_s": asset.duration_s,
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"width": asset.width,
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"height": asset.height,
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"audio": is_audio,
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"allow_download": link.allow_download,
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"file_url": file_url,
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"poster_url": poster_url,
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}
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