feat: 为本地 HTTP API 增加 Token 鉴权与安全加固

- 使用 Electron safeStorage 加密存储并自动初始化 API Token
- 为 health 以外的接口增加 Bearer Token 鉴权
- 限制 CORS 仅允许可信本地 Origin
- 增加鉴权、Token rotation、safeStorage 和手动验收测试

src/main/api-token-store.ts

@@ -0,0 +1,134 @@
+import crypto from 'crypto'
+import { app, safeStorage } from 'electron'
+import fs from 'fs-extra'
+import path from 'path'
+import type {
+  ApiTokenActionResult,
+  ApiTokenRevealResult,
+  ApiTokenStatus
+} from '../shared/local-api-auth'
+
+const MASKED_TOKEN = '••••••••••••••••'
+const TOKEN_BYTES = 32
+const TOKEN_PATTERN = /^[A-Za-z0-9_-]{43}$/
+
+interface TokenReadResult {
+  success: boolean
+  token?: string
+  error?: string
+}
+
+export class ApiTokenStore {
+  private cachedToken: string | null = null
+
+  constructor(private readonly filePathOverride?: string) {}
+
+  private get filePath(): string {
+    return this.filePathOverride || path.join(app.getPath('userData'), 'local-api-token.bin')
+  }
+
+  getStatus(): ApiTokenStatus {
+    const available = safeStorage.isEncryptionAvailable()
+    if (!available) {
+      return {
+        available: false,
+        hasToken: false,
+        maskedToken: MASKED_TOKEN,
+        error: '系统安全存储不可用，本地 API 已安全停用。请检查系统钥匙串或凭据服务后重试。'
+      }
+    }
+    const result = this.read()
+    return {
+      available: true,
+      hasToken: result.success && Boolean(result.token),
+      maskedToken: MASKED_TOKEN,
+      ...(result.success ? {} : { error: result.error })
+    }
+  }
+
+  ensureToken(): ApiTokenActionResult {
+    if (!safeStorage.isEncryptionAvailable()) {
+      return {
+        success: false,
+        available: false,
+        hasToken: false,
+        maskedToken: MASKED_TOKEN,
+        error: '系统安全存储不可用，本地 API 已安全停用。请检查系统钥匙串或凭据服务后重试。'
+      }
+    }
+    const current = this.read()
+    if (!current.success) return this.actionError(current.error)
+    if (current.token) return this.actionSuccess()
+    return this.persist(this.generateToken())
+  }
+
+  revealToken(): ApiTokenRevealResult {
+    const ensured = this.ensureToken()
+    if (!ensured.success) return ensured
+    return { ...ensured, token: this.cachedToken || undefined }
+  }
+
+  rotateToken(): ApiTokenActionResult {
+    if (!safeStorage.isEncryptionAvailable()) return this.ensureToken()
+    return this.persist(this.generateToken())
+  }
+
+  getTokenForAuthentication(): string | null {
+    if (this.cachedToken) return this.cachedToken
+    const result = this.read()
+    return result.success ? result.token || null : null
+  }
+
+  private generateToken(): string {
+    return crypto.randomBytes(TOKEN_BYTES).toString('base64url')
+  }
+
+  private read(): TokenReadResult {
+    if (this.cachedToken) return { success: true, token: this.cachedToken }
+    if (!safeStorage.isEncryptionAvailable()) {
+      return { success: false, error: '系统安全存储不可用' }
+    }
+    if (!fs.existsSync(this.filePath)) return { success: true }
+    try {
+      const token = safeStorage.decryptString(fs.readFileSync(this.filePath))
+      if (!TOKEN_PATTERN.test(token)) throw new Error('invalid token data')
+      this.cachedToken = token
+      return { success: true, token }
+    } catch {
+      return { success: false, error: '已保存的 API Token 无法从系统安全存储读取' }
+    }
+  }
+
+  private persist(token: string): ApiTokenActionResult {
+    try {
+      fs.ensureDirSync(path.dirname(this.filePath))
+      fs.writeFileSync(this.filePath, safeStorage.encryptString(token), { mode: 0o600 })
+      fs.chmodSync(this.filePath, 0o600)
+      this.cachedToken = token
+      return this.actionSuccess()
+    } catch {
+      return this.actionError('API Token 无法保存到系统安全存储')
+    }
+  }
+
+  private actionSuccess(): ApiTokenActionResult {
+    return {
+      success: true,
+      available: true,
+      hasToken: true,
+      maskedToken: MASKED_TOKEN
+    }
+  }
+
+  private actionError(error?: string): ApiTokenActionResult {
+    return {
+      success: false,
+      available: safeStorage.isEncryptionAvailable(),
+      hasToken: false,
+      maskedToken: MASKED_TOKEN,
+      error: error || 'API Token 安全存储不可用'
+    }
+  }
+}
+
+export const apiTokenStore = new ApiTokenStore()