feat：UI及部分后端

backend/src/platform/modrinth.ts

@@ -0,0 +1,49 @@
+import fs from "node:fs";
+import { mr_fastdownload, usemirror } from "../utils/utils.js";
+import { modpack_info, XPlatform } from "./index.js";
+import { join } from "node:path";
+
+interface ModrinthManifest {
+  files: Array<{ path: string; downloads: string[]; fileSize: number; }>;
+  dependencies: {
+    minecraft: string;
+    forge: string;
+    neoforge: string;
+    "fabric-loader": string;
+    [key: string]: string;
+  };
+}
+
+export class Modrinth implements XPlatform {
+  async getinfo(manifest: object): Promise<modpack_info> {
+    let result: modpack_info = Object.create({});
+    const local_manifest = manifest as ModrinthManifest;
+    const depkey = Object.keys(local_manifest.dependencies);
+    const loader = ["forge", "neoforge", "fabric-loader"];
+    result.minecraft = local_manifest.dependencies.minecraft;
+    for (let i = 0; i < depkey.length; i++) {
+      const key = depkey[i];
+      if (key !== "minecraft" && loader.includes(key)) {
+        result.loader = key;
+        result.loader_version = local_manifest.dependencies[key];
+      }
+    }
+    return result;
+  }
+  async downloadfile(manifest: object,path:string): Promise<void> {
+    const index = manifest as ModrinthManifest;
+    let tmp: [string, string, string][] = []
+    index.files.forEach(async (e: { path: string; downloads: string[]; fileSize: number;}) => {
+        if (e.path.endsWith(".zip")) {
+            return;
+          }
+    const unpath = join(path,e.path)
+    if (usemirror){
+        tmp.push(["https://mod.mcimirror.top"+new URL(e.downloads[0]).pathname,unpath,String(e.fileSize)])
+    }else{
+        tmp.push([e.downloads[0],unpath,String(e.fileSize)])
+    }
+    });
+    await mr_fastdownload(tmp as unknown as [string, string, string])
+  }
+}