feat：改了一大堆

backend/src/Dex.ts

@@ -0,0 +1,69 @@
+import fs from "node:fs";
+import websocket from "ws";
+import { yauzl_promise } from "./utils/yauzl.promise.js";
+import { pipeline } from "node:stream/promises";
+import { platform, what_platform } from "./platform/index.js";
+
+interface Iinfo{
+  name:string
+  buffer:Buffer
+}
+
+export class Dex {
+  ws: websocket;
+  in: any;
+  constructor(ws: websocket) {
+    this.ws = ws;
+    this.in = {}
+  }
+
+  public async Main(buffer: Buffer) {
+    const info = await this._getinfo(buffer)
+    const plat = what_platform(info)
+    const mpname = this.in.name
+    await Promise.all([
+      this._unzip(buffer,mpname),
+      platform(plat).downloadfile(this.in,`./instance/${mpname}`)
+    ])
+    //await this._unzip(buffer);
+  }
+
+  private async _getinfo(buffer: Buffer){
+    const important_name = ["manifest.json","modrinth.index.json"]
+    let contain:string = ""
+    const zip = await yauzl_promise(buffer);
+    zip.filter(e=>important_name.includes(e.fileName)).forEach(async e=>{
+      this.in =  JSON.parse((await e.ReadEntry).toString())
+      contain = e.fileName
+    })
+    return contain;
+  }
+
+  private async _unzip(buffer: Buffer,instancename:string) {
+    /* 解压Zip */
+    const zip = await yauzl_promise(buffer);
+    let index = 0;
+    for await (const entry of zip) {
+      const ew = entry.fileName.endsWith("/");
+      if (ew) {
+        await fs.promises.mkdir(`./instance/${instancename}/${entry.fileName}`, {
+          recursive: true,
+        });
+      }
+      if (!ew&&entry.fileName.startsWith("overrides/")) {
+        const dirPath = `./instance/${instancename}/${entry.fileName.substring(
+          0,
+          entry.fileName.lastIndexOf("/")
+        )}`;
+        await fs.promises.mkdir(dirPath, { recursive: true });
+        const stream = await entry.openReadStream;
+        const write = fs.createWriteStream(`./instance/${instancename}/${entry.fileName}`);
+        await pipeline(stream, write);
+      }
+      this.ws.send(JSON.stringify({ status: "unzip", result: { name: entry.fileName,total: zip.length, current:index } }));
+      index++
+    }
+    /* 解压完成 */
+    this.ws.send(JSON.stringify({ status: "changed", result: undefined }));
+  }
+}