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I have AWS Cognito Identity Pool that is configured with Cognito User Pool as an authentication provider.
Assume I have identity ID of an identity in Cognito Identity Pool (e.g. us-east-1:XXaXcXXa-XXXX-XXXX-XXX-XXXXXXXXXXXX) where this identity has a linked login to a user in Cognito User Pool.
Using identity ID, how can I get the linked user details (email, phone, username)?
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In order to get your Identity Pool's ID in AWS Cognito, you have to: Open the AWS Cognito console and click on Manage Identity Pools. Select your Identity pool from the list. Click on the Edit identity pool button at the top right corner.
Amazon Cognito organizes user profile data into datasets. Each dataset can contain up to 1MB of data in the form of key-value pairs.
The username value is a separate attribute and not the same as the name attribute. Each user has a username attribute. Amazon Cognito automatically generates a user name for federated users. You must provide a username attribute to create a native user in the Amazon Cognito directory.
Amazon Cognito can automatically verify email addresses or phone numbers. To do this verification, Amazon Cognito sends a verification code or a verification link. For email addresses, Amazon Cognito can send a code or a link in an email message. For phone numbers, Amazon Cognito sends a code in an SMS text message.
The ID Token that you exchange with Cognito federated identity service to get the identity id and credentials already has all user attributes. You do not need an extra call to any service.
It is a JWT token and you can use any library on the client to decode the values. You can read this guide for more information about the tokens vended by Cognito user pools.
Alternatively, you can also use the Access Token to call GetUser API which will return all the user information.
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