feat: 解析mmkv数据，优化账号选择体验

electron/services/dbPathService.ts

@@ -1,13 +1,90 @@
 import { join, basename } from 'path'
-import { existsSync, readdirSync, statSync } from 'fs'
+import { existsSync, readdirSync, statSync, readFileSync } from 'fs'
 import { homedir } from 'os'
+import { createDecipheriv } from 'crypto'
 
 export interface WxidInfo {
   wxid: string
   modifiedTime: number
+  nickname?: string
+  avatarUrl?: string
 }
 
 export class DbPathService {
+  private readVarint(buf: Buffer, offset: number): { value: number, length: number } {
+    let value = 0;
+    let length = 0;
+    let shift = 0;
+    while (offset < buf.length && shift < 32) {
+      const b = buf[offset++];
+      value |= (b & 0x7f) << shift;
+      length++;
+      if ((b & 0x80) === 0) break;
+      shift += 7;
+    }
+    return { value, length };
+  }
+
+  private extractMmkvString(buf: Buffer, keyName: string): string {
+    const keyBuf = Buffer.from(keyName, 'utf8');
+    const idx = buf.indexOf(keyBuf);
+    if (idx === -1) return '';
+
+    try {
+      let offset = idx + keyBuf.length;
+      const v1 = this.readVarint(buf, offset);
+      offset += v1.length;
+      const v2 = this.readVarint(buf, offset);
+      offset += v2.length;
+
+      // 合理性检查
+      if (v2.value > 0 && v2.value <= 10000 && offset + v2.value <= buf.length) {
+        return buf.toString('utf8', offset, offset + v2.value);
+      }
+    } catch { }
+    return '';
+  }
+
+  private parseGlobalConfig(rootPath: string): { wxid: string, nickname: string, avatarUrl: string } | null {
+    try {
+      const configPath = join(rootPath, 'all_users', 'config', 'global_config');
+      if (!existsSync(configPath)) return null;
+
+      const fullData = readFileSync(configPath);
+      if (fullData.length <= 4) return null;
+      const encryptedData = fullData.subarray(4);
+
+      const key = Buffer.alloc(16, 0);
+      Buffer.from('xwechat_crypt_key').copy(key);   // 直接硬编码，iv更是不重要
+      const iv = Buffer.alloc(16, 0);
+
+      const decipher = createDecipheriv('aes-128-cfb', key, iv);
+      decipher.setAutoPadding(false);
+      const decrypted = Buffer.concat([decipher.update(encryptedData), decipher.final()]);
+
+      const wxid = this.extractMmkvString(decrypted, 'mmkv_key_user_name');
+      const nickname = this.extractMmkvString(decrypted, 'mmkv_key_nick_name');
+      let avatarUrl = this.extractMmkvString(decrypted, 'mmkv_key_head_img_url');
+
+      if (!avatarUrl && decrypted.includes('http')) {
+        const httpIdx = decrypted.indexOf('http');
+        const nullIdx = decrypted.indexOf(0x00, httpIdx);
+        if (nullIdx !== -1) {
+          avatarUrl = decrypted.toString('utf8', httpIdx, nullIdx);
+        }
+      }
+
+      if (wxid || nickname) {
+        return { wxid, nickname, avatarUrl };
+      }
+      return null;
+    } catch (e) {
+      console.error('解析 global_config 失败:', e);
+      return null;
+    }
+  }
+
+
   /**
    * 自动检测微信数据库根目录
    */
@@ -135,21 +212,16 @@ export class DbPathService {
         for (const entry of entries) {
           const entryPath = join(rootPath, entry)
           let stat: ReturnType<typeof statSync>
-          try {
-            stat = statSync(entryPath)
-          } catch {
-            continue
-          }
-
+          try { stat = statSync(entryPath) } catch { continue }
           if (!stat.isDirectory()) continue
           const lower = entry.toLowerCase()
           if (lower === 'all_users') continue
           if (!entry.includes('_')) continue
-
           wxids.push({ wxid: entry, modifiedTime: stat.mtimeMs })
         }
       }
 
+
       if (wxids.length === 0) {
         const rootName = basename(rootPath)
         if (rootName.includes('_') && rootName.toLowerCase() !== 'all_users') {
@@ -159,12 +231,25 @@ export class DbPathService {
       }
     } catch { }
 
-    return wxids.sort((a, b) => {
+    const sorted = wxids.sort((a, b) => {
       if (b.modifiedTime !== a.modifiedTime) return b.modifiedTime - a.modifiedTime
       return a.wxid.localeCompare(b.wxid)
-    })
+    });
+
+    const globalInfo = this.parseGlobalConfig(rootPath);
+    if (globalInfo) {
+      for (const w of sorted) {
+        if (w.wxid.startsWith(globalInfo.wxid) || sorted.length === 1) {
+          w.nickname = globalInfo.nickname;
+          w.avatarUrl = globalInfo.avatarUrl;
+        }
+      }
+    }
+
+    return sorted;
   }
 
+
   /**
    * 扫描 wxid 列表
    */
@@ -187,10 +272,21 @@ export class DbPathService {
       }
     } catch { }
 
-    return wxids.sort((a, b) => {
+    const sorted = wxids.sort((a, b) => {
       if (b.modifiedTime !== a.modifiedTime) return b.modifiedTime - a.modifiedTime
       return a.wxid.localeCompare(b.wxid)
-    })
+    });
+
+    const globalInfo = this.parseGlobalConfig(rootPath);
+    if (globalInfo) {
+      for (const w of sorted) {
+        if (w.wxid.startsWith(globalInfo.wxid) || sorted.length === 1) {
+          w.nickname = globalInfo.nickname;
+          w.avatarUrl = globalInfo.avatarUrl;
+        }
+      }
+    }
+    return sorted;
   }
 
   /**