如何从 AWS Cognito 获取用户名 - Swift答案

【问题标题】：How to get username from AWS Cognito - Swift如何从 AWS Cognito 获取用户名 - Swift
【发布时间】：2018-09-18 00:31:00
【问题描述】：

问答风格：见下面的答案

如何从使用 Cognito 登录的用户那里获取用户名？

我已完成此操作，并且我的用户已登录，现在该怎么办？

AWSAuthUIViewController.presentViewController(
  with: self.navigationController!,
  configuration: config, completionHandler: { (provider: AWSSignInProvider, error: Error?) in
    if error == nil {          
      //get parameters
      }
    } else {
      print(error as Any)
    }
})

}

【问题讨论】：

标签： swift amazon-cognito

【解决方案1】：

先决条件：

在 MobileHub 中注册的应用
MobileHub 中的 Cognito 设置
Mobilehub 使用 AWS 开发工具包与 Swift 项目集成

如果你像我一样，你做到这一点几乎没有困难，现在你被困在试图从登录用户那里获取用户名和其他参数。有很多答案，但到目前为止，我还没有找到一个能让你一路走来的答案。

我能够从各种来源拼凑起来：

   func getUsername() {
    //to check if user is logged in with Cognito... not sure if this is necessary
    let identityManager = AWSIdentityManager.default()
    let identityProvider = identityManager.credentialsProvider.identityProvider.identityProviderName

    if identityProvider == "cognito-identity.amazonaws.com" {
      print("************LOGGED IN WITH COGNITO************")
      let serviceConfiguration = AWSServiceConfiguration(region: .USWest2, credentialsProvider: nil)
      let userPoolConfiguration = AWSCognitoIdentityUserPoolConfiguration(clientId: "YourClientID", clientSecret: "YourSecretKey", poolId: "YourPoolID")
      AWSCognitoIdentityUserPool.register(with: serviceConfiguration, userPoolConfiguration: userPoolConfiguration, forKey: "YourPoolName (typically formatted as YourAppName_userpoool_MOBILEHUB_12345678")
      let pool = AWSCognitoIdentityUserPool(forKey: "YourPoolName")
      // the following line doesn't seem to be necessary and isn't used so I've commented it out, but it is included in official documentation
      //      let credentialsProvider = AWSCognitoCredentialsProvider(regionType: .USWest2, identityPoolId: "YourPoolID", identityProviderManager:pool)          
      if let username = pool.currentUser()?.username {            
        print("Username Retrieved Successfully: \(username)")
      } else {
        print("Error getting username from current user - attempt to get user")
        let user = pool.getUser()            
        let username = user.username
        print("Username: \(username)")
      }
    }
  }

要获取您的 ClientID、Secret Key 和 PoolID，请查看您的 awsconfiguration.json

要获取您的 PoolName，请登录 MobileHub，然后在您项目的后端，转到用户登录，单击电子邮件和密码，然后单击在 Cognito 中编辑。以下页面将您的池名称设为“YourAppName_userpool_MOBILEHUB_12345678”

编辑：获取所有属性：

  if let userFromPool = pool.currentUser() {        
    userFromPool.getDetails().continueOnSuccessWith(block: { (task) -> Any? in
      DispatchQueue.main.async {

        if let error = task.error as NSError? {
          print("Error getting user attributes from Cognito: \(error)")
        } else {
          let response = task.result
          if let userAttributes = response?.userAttributes {
            print("user attributes found: \(userAttributes)")
            for attribute in userAttributes {
              if attribute.name == "email" {
                if let email = attribute.value {
                  print("User Email: \(email)")                      
                }
              }
            }

【讨论】：

我无法获取用户属性。 getDetails() 方法没有调用。

【解决方案2】：

如果您使用的是 Cognito 用户池，则可以使用：

import AWSUserPoolsSignIn

AWSCognitoUserPoolsSignInProvider.sharedInstance()
    .getUserPool()
    .currentUser()?
    .username

【讨论】：

谢谢，我在我的项目中尝试了所有这些方法，但它们都没有为我做任何事情