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WCAG 4.1.2: add WebVTT caption support for <video> elements on tfe.php

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Problem: <video> elements on tfe.php had no <track kind="captions"> element,
violating WCAG 4.1.2 (name, role, value) for video content.

Changes:
- public/tfe.php: collect all text/vtt files from the thesis file list before
  rendering; skip standalone rendering of .vtt entries; for each MP4 emit a
  <track kind="captions" srclang="fr" label="Sous-titres" default> pointing
  to the N-th VTT file (N-th video paired with N-th caption in document order)
- public/media.php: add text/vtt to allowed MIME list; normalise finfo
  text/plain -> text/vtt for .vtt files; add vtt branch to cache/header
  block (Content-Type: text/vtt; charset=utf-8, 1-day cache)
- public/admin/actions/formulaire.php: allow .vtt uploads (text/vtt MIME,
  vtt extension); normalise text/plain finfo result; set file_type='caption'
  for VTT files so they are distinguishable from other thesis files
- public/admin/add.php: extend files field accept attr to include .vtt;
  update hint text to document the VTT sidecar convention

VTT files uploaded under theses/ inherit the same access_type visibility
gate in media.php as all other thesis content (403 for access_type_id=3).
This commit is contained in:
Pontoporeia
2026-04-03 13:24:26 +02:00
parent 6e68edfbff
commit 94e9060dc7
6 changed files with 58 additions and 8 deletions
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todo/04-accessibility.md
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@@ -68,7 +68,7 @@
- [x] **Custom "Externe" checkbox for jury members has no group context** — all jury "Externe" checkboxes now carry explicit `aria-label` (e.g. `"Promoteur·ice — externe"`, `"Lecteur·ice N — externe"`); both static PHP-rendered rows and dynamically added rows via `addJuryRow()` receive the label
- [ ] **`<video>` elements on `tfe.php` have no captions** — add `<track kind="captions">` slot in template; document caption requirement in admin upload form
- [x] **`<video>` elements on `tfe.php` have no captions** — `<track kind="captions">` now emitted for each MP4 when a `.vtt` sidecar has been uploaded alongside it; N-th VTT file is paired with N-th video in document order. `formulaire.php` accepts `.vtt` uploads (MIME `text/vtt`, `file_type = 'caption'`); `media.php` serves VTT with correct `Content-Type`; admin `add.php` file-field hint documents the `.vtt` convention.
- [x] **Admin `<select>` for visibility/access in `edit.php` uses truncated option text** — removed `mb_strimwidth` call; option text now uses full description (`name — description`) so screen-reader accessible name is complete and unambiguous