74 lines
2.3 KiB
TypeScript
74 lines
2.3 KiB
TypeScript
import * as plugins from './smartjimp.plugins.js';
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export interface IAssetVariation {
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format?: 'avif' | 'webp' | 'png';
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width?: number;
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height?: number;
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}
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export class SmartJimp {
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public levelCache = new plugins.levelcache.LevelCache({
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cacheId: 'mastercache',
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maxMemoryStorageInMB: 100,
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maxDiskStorageInMB: 5000,
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});
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/**
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* get a key that is unique for a wanted asset variation
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*/
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private getCacheKey(
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sourceTypeArg: 'streamfile' | 'smartfile',
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sourceIdArg: string,
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assetVariationArg?: IAssetVariation
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) {
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return `${sourceTypeArg}_${sourceIdArg}_${
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assetVariationArg
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? `${assetVariationArg.width || 'auto' }x${assetVariationArg.height || 'auto'}`
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: 'original'
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}`;
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}
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public async computeAssetVariation(assetBufferArg: Buffer, assetVariationArg?: IAssetVariation) {
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if (!assetVariationArg) {
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return assetBufferArg;
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}
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let sharpImage = plugins.sharp(assetBufferArg);
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sharpImage = sharpImage.resize(assetVariationArg.width, assetVariationArg.height);
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const resultResize = sharpImage.resize(assetVariationArg.width, assetVariationArg.height);
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switch (assetVariationArg.format) {
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case 'avif':
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sharpImage = resultResize.avif();
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case 'webp':
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sharpImage = resultResize.webp();
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case 'png':
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sharpImage = resultResize.png();
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}
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return sharpImage.toBuffer();
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}
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public async getFromSmartfile(
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smartfileArg: plugins.smartfile.SmartFile,
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wantedDimensionsArg?: IAssetVariation
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) {
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const cacheKey = this.getCacheKey('smartfile', await smartfileArg.getHash(), wantedDimensionsArg);
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const existingCacheEntry = await this.levelCache.retrieveCacheEntryByKey(cacheKey);
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if (existingCacheEntry) {
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return existingCacheEntry.contents;
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} else {
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const computedAssetBuffer = await this.computeAssetVariation(smartfileArg.contentBuffer, wantedDimensionsArg);
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this.levelCache.storeCacheEntryByKey(cacheKey, new plugins.levelcache.CacheEntry({
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contents: computedAssetBuffer,
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ttl: 600000
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}));
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return computedAssetBuffer;
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}
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}
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public async createAvifImageFromBuffer(bufferArg: Buffer) {
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const sharpImage = plugins.sharp(bufferArg);
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const result = await sharpImage.avif().toBuffer();
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return result;
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}
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}
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