61 lines
1.5 KiB
JavaScript
61 lines
1.5 KiB
JavaScript
export const decryptTool = {
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decryptKey: "2019ysapp7527",
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cachedBlobs: {},
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// 并发控制
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maxConcurrency: 10,
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activeCount: 0,
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queue: [],
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/**
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* @description 图片解密
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* @param url 需要解密的url
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* @returns 解密过后的图片链接
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*/
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async imgDecypt(url) {
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return new Promise((resolve, reject) => {
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const task = async () => {
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try {
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const r = await fetch(url);
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const rb = await r.arrayBuffer();
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const blobUrl = this.imgEncrypt(rb);
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resolve(blobUrl);
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} catch (e) {
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reject(e);
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} finally {
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// 任务完成，减少计数并尝试启动下一个队列任务
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this.activeCount = Math.max(0, this.activeCount - 1);
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if (this.queue.length > 0) {
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const next = this.queue.shift();
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this.activeCount++;
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next();
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}
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}
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};
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if (this.activeCount < this.maxConcurrency) {
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this.activeCount++;
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task();
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} else {
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this.queue.push(task);
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}
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});
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},
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/**
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* 图片解密
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* @param buffer buffer
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* @returns
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*/
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imgEncrypt(buffer) {
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const bytes = new Uint8Array(buffer);
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const encoder = new TextEncoder();
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const KEY = encoder.encode(this.decryptKey);
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for (let i = 0; i < 100; i++) {
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bytes[i] ^= KEY[i % KEY.length];
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}
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const blob = new Blob([bytes], {
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type: "image/png",
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});
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const url = URL.createObjectURL(blob);
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return url;
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},
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};
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