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Merge AWS Cognito External Provider User with Cognito User on Pre SignUp
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import { PreSignUpTriggerEvent, PreSignUpTriggerHandler } from 'aws-lambda'; | |
import { CognitoIdentityServiceProvider } from 'aws-sdk'; | |
const cognito = new CognitoIdentityServiceProvider(); | |
const knownProviderNames = { | |
google: 'Google', | |
facebook: 'Facebook' | |
}; | |
const getProviderName = async (userPoolId: string, providerName: string) => { | |
if (knownProviderNames[providerName]) { | |
return knownProviderNames[providerName]; | |
} | |
const { Providers } = await cognito.listIdentityProviders({ UserPoolId: userPoolId }).promise(); | |
for (const provider of Providers) { | |
if (provider.ProviderName.toLowerCase() === providerName.toLowerCase()) { | |
return provider.ProviderName; | |
} | |
} | |
}; | |
const tryMergeUserAccounts = async (event: PreSignUpTriggerEvent) => { | |
const { userPoolId, userName } = event; | |
const { email } = event.request.userAttributes; | |
const [provider, ...providerValues] = userName.split('_'); | |
const providerValue = providerValues.join('_'); | |
// merge social provider with existing cognito user by email | |
if (provider.length > 0 && providerValue.length > 0) { | |
const [{ Users }, providerName] = await Promise.all([ | |
cognito | |
.listUsers({ | |
UserPoolId: userPoolId, | |
AttributesToGet: ['email'], | |
Filter: `email = "${email}"`, | |
Limit: 1 | |
}) | |
.promise(), | |
getProviderName(userPoolId, provider) | |
]); | |
if (providerName && Users.length > 0) { | |
for (const user of Users) { | |
await cognito | |
.adminLinkProviderForUser({ | |
UserPoolId: userPoolId, | |
DestinationUser: { | |
ProviderName: 'Cognito', | |
ProviderAttributeValue: user.Username | |
}, | |
SourceUser: { | |
ProviderName: providerName, | |
ProviderAttributeName: 'Cognito_Subject', | |
ProviderAttributeValue: providerValue | |
} | |
}) | |
.promise(); | |
} | |
// return true to indicate users were merged | |
return true; | |
} | |
} | |
return false; | |
}; | |
export const handler: PreSignUpTriggerHandler = async (event, _, callback) => { | |
// continue the flow only if did not link providers | |
const wereUsersMerged = await tryMergeUserAccounts(event); | |
return wereUsersMerged ? undefined : callback(null, event); | |
}; |
Don't use callback in an async handler, just return.
@onhate @Samrose-Ahmed @johnny68 @njeirath @coyksdev can any one provide code for js please
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@johnny68 updated to suport dynamic providers other than facebook and google