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implement content-hash based image cache invalidation

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Add content-based hashing to recipe images for proper cache invalidation
while maintaining graceful degradation through dual file storage.

Changes:
- Add imageHash utility with SHA-256 content hashing (8-char)
- Update Recipe model to store hashed filenames in images[0].mediapath
- Modify image upload endpoint to save both hashed and unhashed versions
- Update frontend components to use images[0].mediapath with fallback
- Add migration endpoint to hash existing images (production-only)
- Update image delete/rename endpoints to handle both file versions

Images are now stored as:
  - recipe.a1b2c3d4.webp (hashed, cached forever)
  - recipe.webp (unhashed, graceful degradation fallback)

Database stores hashed filename for cache busting, while unhashed
version remains on disk for backward compatibility and manual uploads.
This commit is contained in:
Alexander Bocken
2026-01-02 12:06:53 +01:00
parent 6bf3518db7
commit ccf3fd7ea2
12 changed files with 603 additions and 38 deletions
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16
src/routes/[recipeLang=recipeLang]/[name]/+page.svelte
View File

@@ -35,10 +35,14 @@
const isEnglish = $derived(data.lang === 'en');
// Use German short_name for images (they're the same for both languages)
const imageShortName = $derived(data.germanShortName || data.short_name);
const hero_img_src = $derived("https://bocken.org/static/rezepte/full/" + imageShortName + ".webp?v=" + data.dateModified);
const placeholder_src = $derived("https://bocken.org/static/rezepte/placeholder/" + imageShortName + ".webp?v=" + data.dateModified);
// Use mediapath from images array (includes hash for cache busting)
// Fallback to short_name.webp for backward compatibility
const img_filename = $derived(
data.images?.[0]?.mediapath ||
`${data.germanShortName || data.short_name}.webp`
);
const hero_img_src = $derived("https://bocken.org/static/rezepte/full/" + img_filename);
const placeholder_src = $derived("https://bocken.org/static/rezepte/placeholder/" + img_filename);
const months = $derived(isEnglish
? ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"]
@@ -296,8 +300,8 @@ h4{
<svelte:head>
<title>{stripHtmlTags(data.name)} - {labels.title}</title>
<meta name="description" content="{stripHtmlTags(data.description)}" />
<meta property="og:image" content="https://bocken.org/static/rezepte/thumb/{imageShortName}.webp" />
<meta property="og:image:secure_url" content="https://bocken.org/static/rezepte/thumb/{imageShortName}.webp" />
<meta property="og:image" content="https://bocken.org/static/rezepte/thumb/{img_filename}" />
<meta property="og:image:secure_url" content="https://bocken.org/static/rezepte/thumb/{img_filename}" />
<meta property="og:image:type" content="image/webp" />
<meta property="og:image:alt" content="{stripHtmlTags(data.name)}" />
{@html `<script type="application/ld+json">${JSON.stringify(data.recipeJsonLd)}</script>`}