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Emit og:image:alt / twitter:image:alt on bskyweb post pages

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Post embeds already carry author-provided alt text in the appview
response (images, gallery items, and video), but bskyweb dropped it when
extracting og:image thumbnails, so link previews and crawlers never saw
an image description.

Extend extractPostMedia to return thumb+alt pairs and emit
og:image:alt / twitter:image:alt after each og:image / twitter:image
when the alt text is non-empty. Video posts use the video's alt text for
the poster thumbnail. JSON-LD callers flatten via a new imageURLs helper
so image[] strings stay byte-identical to og:image.

Related to the spirit of #8033 (alt text on link card images), but on
the bskyweb OpenGraph output side.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ki4kET2FKHBfNWR6jx6ooW
This commit is contained in:
Claude
2026-07-22 19:44:21 +00:00
parent f62e54ec82
commit 0820788d6f
5 changed files with 139 additions and 32 deletions
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bskyweb/templates/post.html
+10 -4
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@@ -33,10 +33,16 @@
<meta property="og:description" content="{{ postText }}">
<meta property="twitter:description" content="{{ postText }}">
{% endif -%}
{%- if imgThumbUrls %}
{% for imgThumbUrl in imgThumbUrls %}
<meta property="og:image" content="{{ imgThumbUrl }}">
<meta property="twitter:image" content="{{ imgThumbUrl }}">
{%- if postImages %}
{% for img in postImages %}
<meta property="og:image" content="{{ img.Thumb }}">
{%- if img.Alt %}
<meta property="og:image:alt" content="{{ img.Alt }}">
{% endif -%}
<meta property="twitter:image" content="{{ img.Thumb }}">
{%- if img.Alt %}
<meta property="twitter:image:alt" content="{{ img.Alt }}">
{% endif -%}
{% endfor %}
<meta name="twitter:card" content="summary_large_image">
{% else %}