Prevent duplicate username from federated logins












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I have Cognito setup with login supported from multiple identity providers (Cognito User Pools, Facebook, and Google). In my User Pool configuration I have email used as username. The desired functionality is to have username be unique across all identity providers. i.e. if a user logs in with Facebook and their facebook email is "user@test.com" and then they login with Google and their google email is "user@test.com", either they should not be able to login or their federated identities should be merged.



This is user management for connected devices. I don't want a user to setup a few devices while logged into Facebook, then login with Google and not be able to see their devices from their Facebook account.



I know this gets complicated since you can create a Facebook account with just a phone number.



I know there is a pre-authentication trigger in Cognito User Pool's, but it doesn't seem to be triggering when I login with a federated identity. Is there a trigger than I can use that will fire no matter which identity provider I use (User Pool, Facebook, Google)?



Thanks,










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    1















    I have Cognito setup with login supported from multiple identity providers (Cognito User Pools, Facebook, and Google). In my User Pool configuration I have email used as username. The desired functionality is to have username be unique across all identity providers. i.e. if a user logs in with Facebook and their facebook email is "user@test.com" and then they login with Google and their google email is "user@test.com", either they should not be able to login or their federated identities should be merged.



    This is user management for connected devices. I don't want a user to setup a few devices while logged into Facebook, then login with Google and not be able to see their devices from their Facebook account.



    I know this gets complicated since you can create a Facebook account with just a phone number.



    I know there is a pre-authentication trigger in Cognito User Pool's, but it doesn't seem to be triggering when I login with a federated identity. Is there a trigger than I can use that will fire no matter which identity provider I use (User Pool, Facebook, Google)?



    Thanks,










    share|improve this question

























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      1








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      1






      I have Cognito setup with login supported from multiple identity providers (Cognito User Pools, Facebook, and Google). In my User Pool configuration I have email used as username. The desired functionality is to have username be unique across all identity providers. i.e. if a user logs in with Facebook and their facebook email is "user@test.com" and then they login with Google and their google email is "user@test.com", either they should not be able to login or their federated identities should be merged.



      This is user management for connected devices. I don't want a user to setup a few devices while logged into Facebook, then login with Google and not be able to see their devices from their Facebook account.



      I know this gets complicated since you can create a Facebook account with just a phone number.



      I know there is a pre-authentication trigger in Cognito User Pool's, but it doesn't seem to be triggering when I login with a federated identity. Is there a trigger than I can use that will fire no matter which identity provider I use (User Pool, Facebook, Google)?



      Thanks,










      share|improve this question














      I have Cognito setup with login supported from multiple identity providers (Cognito User Pools, Facebook, and Google). In my User Pool configuration I have email used as username. The desired functionality is to have username be unique across all identity providers. i.e. if a user logs in with Facebook and their facebook email is "user@test.com" and then they login with Google and their google email is "user@test.com", either they should not be able to login or their federated identities should be merged.



      This is user management for connected devices. I don't want a user to setup a few devices while logged into Facebook, then login with Google and not be able to see their devices from their Facebook account.



      I know this gets complicated since you can create a Facebook account with just a phone number.



      I know there is a pre-authentication trigger in Cognito User Pool's, but it doesn't seem to be triggering when I login with a federated identity. Is there a trigger than I can use that will fire no matter which identity provider I use (User Pool, Facebook, Google)?



      Thanks,







      facebook amazon-web-services amazon-cognito aws-userpools






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      asked Nov 28 '18 at 16:47









      Nelson.b.austinNelson.b.austin

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