66 lines
1.4 KiB
TypeScript
66 lines
1.4 KiB
TypeScript
import { hash } from "@lib/hash.ts";
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import * as cache from "@lib/cache/cache.ts";
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type ImageCacheOptions = {
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url: string;
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width: number;
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height: number;
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mediaType?: string;
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};
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const CACHE_KEY = "images";
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function getCacheKey({ url: _url, width, height }: ImageCacheOptions) {
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const url = new URL(_url);
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return `${CACHE_KEY}/${url.hostname}/${url.pathname}/${width}/${height}`
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.replace(
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"//",
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"/",
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);
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}
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export async function getImage({ url, width, height }: ImageCacheOptions) {
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const cacheKey = getCacheKey({ url, width, height });
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const pointerCacheRaw = await cache.get<string>(cacheKey);
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if (!pointerCacheRaw) return;
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const pointerCache = typeof pointerCacheRaw === "string"
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? JSON.parse(pointerCacheRaw)
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: pointerCacheRaw;
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const imageContent = await cache.get(pointerCache.id, true);
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if (!imageContent) return;
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return {
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...pointerCache,
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buffer: imageContent,
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};
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}
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export async function setImage(
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buffer: Uint8Array,
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{ url, width, height, mediaType }: ImageCacheOptions,
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) {
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const clone = new Uint8Array(buffer);
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const cacheKey = getCacheKey({ url, width, height });
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const pointerId = await hash(cacheKey);
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await cache.set(pointerId, clone);
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cache.expire(pointerId, 60 * 10);
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cache.expire(cacheKey, 60 * 10);
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await cache.set(
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cacheKey,
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JSON.stringify({
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id: pointerId,
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url,
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width,
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height,
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mediaType,
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}),
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);
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}
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