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fix(share): self-host og:image so link previews stay reliable

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A remote thumbnail as og:image is unreliable for the crawler — Facebook's signed
CDN URL expires (so an old shared link's image later vanishes) and cross-origin
hotlinking is flaky. Record a self-hosted poster for EVERY download (ensure_poster
returns the existing <base>.jpg thumbnail sidecar, or cuts a frame) and point
og:image at our own /api/public/watch/{token}/poster.jpg. Backfill now fills
poster_path for all existing downloads, not just thumbnail-less ones.
This commit is contained in:
npeter83 2026-07-07 22:43:18 +02:00
parent 8b02b41059
commit b63b3334d6
4 changed files with 17 additions and 11 deletions
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9
backend/app/worker.py
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@ -428,10 +428,11 @@ def _download(job_id: int, asset_id: int, source_kind: str, source_ref: str, spe
asset.uploader_url = _uploader_url(info)
asset.upload_date = meta.upload_date
asset.thumbnail_url = meta.thumbnail_url
# No thumbnail from the source (e.g. a direct media URL) → cut a poster frame from
# the file so the card / watch page / link preview still shows an image.
if not meta.thumbnail_url:
asset.poster_path = editmod.ensure_poster(asset, settings.download_root)
# Record a self-hosted poster for every download: it's the reliable link-preview
# (og:image) source — a remote thumbnail, esp. Facebook's signed CDN URL, expires
# and can't be relied on cross-origin. write_sidecars already wrote <base>.jpg from
# the thumbnail; ensure_poster returns that, or cuts a frame if there was none.
asset.poster_path = editmod.ensure_poster(asset, settings.download_root)
asset.source_webpage_url = info.get("webpage_url")
asset.nfo_written = nfo_ok
asset.error = None