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google: {
    name: 'Google',
    protocol: 'oauth2',
    scope: ['openid', 'email', 'profile'],
    accessType: 'offline',       // 是否離線存取
    approvalPrompt: 'force',     // 每次登入時詢問
    strategy: require('passport-google-oauth').OAuth2Strategy,
    options: {
      clientID: '',
      clientSecret: '',
      url: '',
      callbackURL: ''
    }
  }