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Amazon Cognito Identity Provider
API Reference (API Version 2016-04-18)

AdminLinkProviderForUser

Links an existing user account in a user pool (DestinationUser) to an identity from an external identity provider (SourceUser) based on a specified attribute name and value from the external identity provider. This allows you to create a link from the existing user account to an external federated user identity that has not yet been used to sign in, so that the federated user identity can be used to sign in as the existing user account.

For example, if there is an existing user with a username and password, this API links that user to a federated user identity, so that when the federated user identity is used, the user signs in as the existing user account.

Important

Because this API allows a user with an external federated identity to sign in as an existing user in the user pool, it is critical that it only be used with external identity providers and provider attributes that have been trusted by the application owner.

See also AdminDisableProviderForUser.

This action is enabled only for admin access and requires developer credentials.

Request Syntax

{ "DestinationUser": { "ProviderAttributeName": "string", "ProviderAttributeValue": "string", "ProviderName": "string" }, "SourceUser": { "ProviderAttributeName": "string", "ProviderAttributeValue": "string", "ProviderName": "string" }, "UserPoolId": "string" }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

DestinationUser

The existing user in the user pool to be linked to the external identity provider user account. Can be a native (Username + Password) Cognito User Pools user or a federated user (for example, a SAML or Facebook user). If the user doesn't exist, an exception is thrown. This is the user that is returned when the new user (with the linked identity provider attribute) signs in.

For a native username + password user, the ProviderAttributeValue for the DestinationUser should be the username in the user pool. For a federated user, it should be the provider-specific user_id.

The ProviderAttributeName of the DestinationUser is ignored.

The ProviderName should be set to Cognito for users in Cognito user pools.

Type: ProviderUserIdentifierType object

Required: Yes

SourceUser

An external identity provider account for a user who does not currently exist yet in the user pool. This user must be a federated user (for example, a SAML or Facebook user), not another native user.

If the SourceUser is a federated social identity provider user (Facebook, Google, or Login with Amazon), you must set the ProviderAttributeName to Cognito_Subject. For social identity providers, the ProviderName will be Facebook, Google, or LoginWithAmazon, and Cognito will automatically parse the Facebook, Google, and Login with Amazon tokens for id, sub, and user_id, respectively. The ProviderAttributeValue for the user must be the same value as the id, sub, or user_id value found in the social identity provider token.

For SAML, the ProviderAttributeName can be any value that matches a claim in the SAML assertion. If you wish to link SAML users based on the subject of the SAML assertion, you should map the subject to a claim through the SAML identity provider and submit that claim name as the ProviderAttributeName. If you set ProviderAttributeName to Cognito_Subject, Cognito will automatically parse the default unique identifier found in the subject from the SAML token.

Type: ProviderUserIdentifierType object

Required: Yes

UserPoolId

The user pool ID for the user pool.

Type: String

Required: Yes

Response Elements

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

Errors

For information about the errors that are common to all actions, see Common Errors.

AliasExistsException

This exception is thrown when a user tries to confirm the account with an email or phone number that has already been supplied as an alias from a different account. This exception tells user that an account with this email or phone already exists.

HTTP Status Code: 400

InternalErrorException

This exception is thrown when Amazon Cognito encounters an internal error.

HTTP Status Code: 500

InvalidParameterException

This exception is thrown when the Amazon Cognito service encounters an invalid parameter.

HTTP Status Code: 400

NotAuthorizedException

This exception is thrown when a user is not authorized.

HTTP Status Code: 400

ResourceNotFoundException

This exception is thrown when the Amazon Cognito service cannot find the requested resource.

HTTP Status Code: 400

TooManyRequestsException

This exception is thrown when the user has made too many requests for a given operation.

HTTP Status Code: 400

UserNotFoundException

This exception is thrown when a user is not found.

HTTP Status Code: 400

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: