fix: address race conditions and add path validation

- Fixed race condition in getProjects() by using Promise.all with proper async/await
- Fixed race condition in getVersions() by using Promise.all with proper async/await
- Fixed race condition in getApks() by ensuring Promise.all wraps the async map
- Added validatePath() helper function to prevent path traversal attacks
- Applied path validation to all file system operations

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

lib/fs-utils.ts

@@ -3,30 +3,55 @@ import fs from 'fs/promises';
 import path from 'path';
 import { RESOURCE_PATH } from './constants';
 
+/**
+ * Validate that a path doesn't escape the base directory (prevents path traversal)
+ */
+function validatePath(basePath: string, ...segments: string[]): string {
+  const fullPath = path.resolve(basePath, ...segments);
+  const normalizedBase = path.resolve(basePath);
+  if (!fullPath.startsWith(normalizedBase)) {
+    throw new Error('Invalid path: path traversal detected');
+  }
+  return fullPath;
+}
+
 /**
  * 获取所有项目目录
  */
 export async function getProjects(): Promise<string[]> {
   const dirs = await fs.readdir(RESOURCE_PATH);
-  const projectDirs = dirs.filter(dir => {
-    const dirPath = path.join(RESOURCE_PATH, dir);
-    // 检查是否是目录
-    return fs.stat(dirPath).then(stats => stats.isDirectory()).catch(() => false);
-  });
-  return projectDirs;
+  const projectDirs = await Promise.all(
+    dirs.map(async (dir) => {
+      const dirPath = validatePath(RESOURCE_PATH, dir);
+      try {
+        const stats = await fs.stat(dirPath);
+        return stats.isDirectory() ? dir : null;
+      } catch {
+        return null;
+      }
+    })
+  );
+  return projectDirs.filter((dir): dir is string => dir !== null);
 }
 
 /**
  * 获取指定项目的所有版本目录
  */
 export async function getVersions(project: string): Promise<string[]> {
-  const projectPath = path.join(RESOURCE_PATH, project);
+  const projectPath = validatePath(RESOURCE_PATH, project);
   const dirs = await fs.readdir(projectPath);
-  const versionDirs = dirs.filter(dir => {
-    const dirPath = path.join(projectPath, dir);
-    return fs.stat(dirPath).then(stats => stats.isDirectory()).catch(() => false);
-  });
-  return versionDirs.sort();
+  const versionDirs = await Promise.all(
+    dirs.map(async (dir) => {
+      const dirPath = validatePath(projectPath, dir);
+      try {
+        const stats = await fs.stat(dirPath);
+        return stats.isDirectory() ? dir : null;
+      } catch {
+        return null;
+      }
+    })
+  );
+  return versionDirs.filter((dir): dir is string => dir !== null).sort();
 }
 
 /**
@@ -38,7 +63,7 @@ export async function getApks(project: string, version: string, commitId?: strin
   size: number;
   modifiedAt: Date;
 }[]> {
-  const apksPath = path.join(RESOURCE_PATH, project, version, 'apks');
+  const apksPath = validatePath(RESOURCE_PATH, project, version, 'apks');
 
   try {
     const files = await fs.readdir(apksPath);
@@ -46,7 +71,7 @@ export async function getApks(project: string, version: string, commitId?: strin
 
     const apks = await Promise.all(
       apkFiles.map(async (file) => {
-        const filePath = path.join(apksPath, file);
+        const filePath = validatePath(apksPath, file);
         const stats = await fs.stat(filePath);
 
         // 提取 commit id (假设文件名格式为 xxx-{commit}-xxx.apk)