7611f3d266
Newlay's Blossom enabled on the relay box (blobs inside the data volume); Caddy + DNS + TLS wired. The app now uploads there first, keeping blossom.primal.net and blossom.band as mirrors, and includes it in BLOSSOM_MIRROR_HOSTS for read fallback.
51 lines
1.7 KiB
TypeScript
51 lines
1.7 KiB
TypeScript
/**
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* Photo redundancy helpers.
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*
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* SkateSpots uploads images to Blossom, which is CONTENT-ADDRESSED: a blob's URL
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* is `<host>/<sha256>` (optionally with a file extension). That means a mirror of
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* the same file on another known host is derivable from the URL alone — no extra
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* bookkeeping needed — so a dead photo host never has to leave a blank spot.
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*
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* We only derive mirrors for Blossom-style hash paths; anything else is left
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* untouched (an external image URL has no meaningful alternative location).
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*/
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/** Hosts the app uploads to, and therefore the hosts we can mirror across. */
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export const BLOSSOM_MIRROR_HOSTS = ['blossom.skate-spots.org', 'blossom.primal.net', 'blossom.band'];
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/** `<64-hex>` or `<64-hex>.<ext>` */
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const HASH_RE = /^([0-9a-f]{64})(\.[a-z0-9]+)?$/i;
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/**
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* Ordered candidate URLs for an image: the original first, then any explicitly
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* supplied fallbacks, then same-hash mirrors on the other known Blossom hosts.
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*/
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export function imageCandidates(
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src: string | undefined | null,
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extra: string[] = [],
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): string[] {
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const out: string[] = [];
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const add = (url?: string | null) => {
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if (typeof url === 'string' && url && !out.includes(url)) out.push(url);
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};
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add(src);
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for (const url of extra) add(url);
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if (!src) return out;
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try {
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const parsed = new URL(src);
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const last = parsed.pathname.split('/').filter(Boolean).pop() ?? '';
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const match = HASH_RE.exec(last);
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if (match) {
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for (const host of BLOSSOM_MIRROR_HOSTS) {
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if (host === parsed.hostname) continue;
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add(`${parsed.protocol}//${host}/${match[1]}${match[2] ?? ''}`);
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}
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}
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} catch {
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// Relative or malformed URL — nothing to mirror.
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}
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return out;
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}
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