Open Graph link previews for shared articles#639
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Mirrors the audio-lesson previews (#637/#638) for articles shared as zeeguu.org/read/article?id=N. New public, no-auth endpoints in article.py: - GET /shared_article_preview/<id> → server-rendered OG/Twitter HTML - GET /shared_article_image/<id>.png → a 1200x630 card The card features the article's own photo full-bleed under a scrim, with the title, source, reading time (word_count/200), and CEFR level — falling back to the branded cream card when an article has no image (rendered by og_image.render_article_card). A transient image-fetch failure serves the fallback without caching it, so the photo card appears once the fetch succeeds. nginx routing for /read/article is staged separately in the ops repo. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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This was referenced May 27, 2026
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What
Extends the shared-lesson link previews (#637/#638) to articles shared as
zeeguu.org/read/article?id=N. Two new public, no-auth endpoints inarticle.py:GET /shared_article_preview/<id>— server-rendered OG/Twitter HTML (title, description, image, canonical → the app page, meta-refresh fallback).GET /shared_article_image/<id>.png— a 1200×630 card.The card
Unlike audio lessons (no inherent image → branded card), articles reliably have a hero image, so the card features the article's own photo full-bleed under a bottom scrim, with white title + a
<Language> Articlepill +CEFR · N min read · Source. When an article has no image, it falls back to the branded cream card (the article sibling of the audio card).og_image.render_article_carddoes both.Data comes from
article.article_info()(title, language,img_url,word_count→min read,cefr_level) +article.feed.titlefor the source. CEFR is shown here (a single level is a key "is this for me?" filter for articles — distinct from the misleading level-transitions we avoid elsewhere).Robustness: a transient image-fetch failure serves the fallback without caching it (short TTL), so the photo card appears once the fetch succeeds; otherwise cards are rendered once and cached on disk per article id.
Out of scope / deploy
/read/articleis staged separately in the ops repo (location = /read/article→ crawler UAs proxied to/shared_article_preview/$arg_id).og-images/shared-articles/).Verified by rendering the photo card and the no-photo fallback via the real
render_article_card; endpoints compile;.pngroute +requestsconfirmed. Not run end-to-end locally (DB drift) — smoke-test on deploy.🤖 Generated with Claude Code