在 AWS 和 Ionic 中获取"Missing credentials in config"

Question

我目前在使用AWS作为后端的应用程序时遇到了一个大问题。当我测试应用程序时，第一次在手机上安装应用程序或在浏览器上提供应用程序时出现错误。登录后第一次，我必须立即从 DynamoDB 加载用户的数据，但出现此错误

邮编 https://cognito-identity.us-east-1.amazonaws.com/400 (( 错误：配置中缺少凭据

所以我已经安慰了我发现的凭据，它全部设置为空。第一次刷新页面后(关闭并在手机上打开应用程序(。我注意到凭据不再为空，但 DynamoDb 查询仍未处理。

第三次刷新一切，按预期恢复工作。这使得我的应用程序的用户体验如此糟糕，所以我必须找到一个解决方案。

这是我的登录功能

 login(username, password) {
    return new Promise((resolve, reject) => {
      let user = this.cognito.makeUser(username);
      let authDetails = this.cognito.makeAuthDetails(username, password);
      user.authenticateUser(authDetails, {
        'onSuccess': (result:any) => {
          var logins = {};
          var loginKey = 'cognito-idp.' +
                          aws_cognito_region +
                          '.amazonaws.com/' +
                          aws_user_pools_id;
          logins[loginKey] = result.getIdToken().getJwtToken();
          AWS.config.credentials = new AWS.CognitoIdentityCredentials({
           'IdentityPoolId': aws_cognito_identity_pool_id,
           'Logins': logins
          });

          AWS.config.credentials.get((err) => {
            if (err) {
              return reject(err);
            }
            this.isAuthenticated().then(() => {
              resolve();
            }).catch((err) => {
              console.log('auth session failed');
            });
          });
        },
        'onFailure': (err:any) => {
          console.log('authentication failed');
          reject(err);
        },
        newPasswordRequired: (userAttributes, Password) => {
          // User was signed up by an admin and must provide new
          // password and required attributes, if any, to complete
          // authentication.
          var newPassword;
          console.log(newPassword);
          delete userAttributes.email_verified;
          delete userAttributes.phone_number_verified;
          let addModal = this.modalCtrl.create(ChangePasswordPage );
          addModal.onDidDismiss(data => {
            newPassword = data;
            user.completeNewPasswordChallenge(newPassword, userAttributes, {
              onSuccess: (result:any) => {
                  var logins = {};
                  var loginKey = 'cognito-idp.' +
                                  aws_cognito_region +
                                  '.amazonaws.com/' +
                                  aws_user_pools_id;
                   logins[loginKey] = result.getIdToken().getJwtToken();
                   AWS.config.credentials = new AWS.CognitoIdentityCredentials({
                   'IdentityPoolId': aws_cognito_identity_pool_id,
                   'Logins': logins
                  });
                   AWS.config.credentials.get((err) => {
                    if (err) {
                      return reject(err);
                    }

                    });
                  this.isAuthenticated().then(() => { 
                    resolve();
                  }).catch((err) => {
                    console.log('auth session failed');
                  });

              },
              authSuccess: function (result){
                console.log('In the AuthSuccess.');
              },
              onFailure: function(err) {
                console.log('In the Error '+err);
              }
            }); 
             console.log(newPassword);
          })
          addModal.present();
          console.log(newPassword);
      }
      });
    });
  }

这是我的dynamoDb函数：

refreshTasks() {
  console.log( AWS.config.credentials);
  return new Promise((resolve, reject) => {
  var d = new Date();
  var s=  [this.pad(d.getDate()), this.pad(d.getMonth()+1), d.getFullYear()].join('/');
    console.log(s);

  const params = {
    'TableName': this.dailyTable,
    'KeyConditionExpression':
     "#userId = :userId AND d = :day",
    'ExpressionAttributeNames': {
       '#userId': 'userId'
  },
    'ExpressionAttributeValues': {
       ':userId': AWS.config.credentials.identityId,
       ':day':s.toString()
     },
    'ScanIndexForward': false
  };
  this.db.getDocumentClient().query(params).promise().then((data) => {
    console.log("data loaded");
    console.log(data);
    resolve(data);
  }).catch((err) => {
    console.log(err);
  });
  });
}

Answer 1

通过允许匿名访问移动集线器项目来修复此问题。由于凭据延迟加载。并使用用户 ID 查询表，直到凭据准备就绪。这是谁有相同问题的临时解决方案。