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InvalidLambdaResponseException - Unrecognizable lambda output when sign in without password with amplify

AWS Cognito User Pool without a passwordIs there a way to cache GitHub credentials for pushing commits?Unrecognizable Lambda Output CognitoCognito auth flow fails with “Already found an entry for username Facebook_10155611263153532”AWS Cognito username/email login is case-sensitivePasswordless Cognito with SMS MFAAWS Cognito: Is there a way to provide Security token for scoped down IAM roles using Cognito?Cognito / Flask / React: how to log into backend?Unrecognized Verify Auth Challenge Lambda response C#AWS Cognito lambda triggers twiceContinue with custom auth flow after NEW_PASSWORD_REQUIRED challenge is answered in AWS Cognito

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0

1

I am developing a custom auth flow in aws cognito with lambda triggers.

I used the sample code given by aws for lambda triggers DefineAuthChallenge_Authentication, CreateAuthChallenge_Authentication and VerifyAuthChallenge_Authentication, It's even explained in this answer,
AWS Cognito User Pool without a password

But when I sign in from frontend with amplify it says
code: "InvalidLambdaResponseException", name: "InvalidLambdaResponseException", message: "Unrecognizable lambda output"

After the Define auth challenge when create auth challenge is invoked the challenge is not in the event.request.session, it's an empty array. The challengeName attribute is just there in the event.response as following,

triggerSource: 'CreateAuthChallenge_Authentication',
request: 
 userAttributes: 
 sub: 'xxxxx-xxxxx-xxxx',
'cognito:user_status': 'CONFIRMED',
name: 'sala',
phone_number_verified: 'true',
'cognito:phone_number_alias': '+947xxxxxxxxx',
phone_number: '+947xxxxxxxxx' ,
challengeName: 'CUSTOM_CHALLENGE',
session: [] ,

Following is my define auth challenge,
`

exports.handler = async event => 
 if (
 event.request.session &&
 event.request.session.length >= 3 &&
 event.request.session.slice(-1)[0].challengeResult === false
 ) 
 // The user provided a wrong answer 3 times; fail auth
 event.response.issueTokens = false;
 event.response.failAuthentication = true;
 else if (
 event.request.session &&
 event.request.session.length &&
 event.request.session.slice(-1)[0].challengeResult === true
 ) 
 // The user provided the right answer; succeed auth
 event.response.issueTokens = true;
 event.response.failAuthentication = false;
 else 
 // The user did not provide a correct answer yet; present challenge
 event.response.issueTokens = false;
 event.response.failAuthentication = false;
 event.response.challengeName = 'CUSTOM_CHALLENGE';
 
 return event;
;

amazon-web-services authentication aws-lambda amazon-cognito

share|improve this question

edited Mar 27 at 2:14

John Rotenstein

90.5k88 gold badges103103 silver badges154154 bronze badges

asked Mar 26 at 11:33

Dinuka SalwathuraDinuka Salwathura

44766 silver badges2020 bronze badges

add a comment | 

0

1

I am developing a custom auth flow in aws cognito with lambda triggers.

I used the sample code given by aws for lambda triggers DefineAuthChallenge_Authentication, CreateAuthChallenge_Authentication and VerifyAuthChallenge_Authentication, It's even explained in this answer,
AWS Cognito User Pool without a password

But when I sign in from frontend with amplify it says
code: "InvalidLambdaResponseException", name: "InvalidLambdaResponseException", message: "Unrecognizable lambda output"

After the Define auth challenge when create auth challenge is invoked the challenge is not in the event.request.session, it's an empty array. The challengeName attribute is just there in the event.response as following,

triggerSource: 'CreateAuthChallenge_Authentication',
request: 
 userAttributes: 
 sub: 'xxxxx-xxxxx-xxxx',
'cognito:user_status': 'CONFIRMED',
name: 'sala',
phone_number_verified: 'true',
'cognito:phone_number_alias': '+947xxxxxxxxx',
phone_number: '+947xxxxxxxxx' ,
challengeName: 'CUSTOM_CHALLENGE',
session: [] ,

Following is my define auth challenge,
`

exports.handler = async event => 
 if (
 event.request.session &&
 event.request.session.length >= 3 &&
 event.request.session.slice(-1)[0].challengeResult === false
 ) 
 // The user provided a wrong answer 3 times; fail auth
 event.response.issueTokens = false;
 event.response.failAuthentication = true;
 else if (
 event.request.session &&
 event.request.session.length &&
 event.request.session.slice(-1)[0].challengeResult === true
 ) 
 // The user provided the right answer; succeed auth
 event.response.issueTokens = true;
 event.response.failAuthentication = false;
 else 
 // The user did not provide a correct answer yet; present challenge
 event.response.issueTokens = false;
 event.response.failAuthentication = false;
 event.response.challengeName = 'CUSTOM_CHALLENGE';
 
 return event;
;

amazon-web-services authentication aws-lambda amazon-cognito

share|improve this question

edited Mar 27 at 2:14

John Rotenstein

90.5k88 gold badges103103 silver badges154154 bronze badges

asked Mar 26 at 11:33

Dinuka SalwathuraDinuka Salwathura

44766 silver badges2020 bronze badges

add a comment | 

I am developing a custom auth flow in aws cognito with lambda triggers.

I used the sample code given by aws for lambda triggers DefineAuthChallenge_Authentication, CreateAuthChallenge_Authentication and VerifyAuthChallenge_Authentication, It's even explained in this answer,
AWS Cognito User Pool without a password

But when I sign in from frontend with amplify it says
code: "InvalidLambdaResponseException", name: "InvalidLambdaResponseException", message: "Unrecognizable lambda output"

After the Define auth challenge when create auth challenge is invoked the challenge is not in the event.request.session, it's an empty array. The challengeName attribute is just there in the event.response as following,

triggerSource: 'CreateAuthChallenge_Authentication',
request: 
 userAttributes: 
 sub: 'xxxxx-xxxxx-xxxx',
'cognito:user_status': 'CONFIRMED',
name: 'sala',
phone_number_verified: 'true',
'cognito:phone_number_alias': '+947xxxxxxxxx',
phone_number: '+947xxxxxxxxx' ,
challengeName: 'CUSTOM_CHALLENGE',
session: [] ,

Following is my define auth challenge,
`

exports.handler = async event => 
 if (
 event.request.session &&
 event.request.session.length >= 3 &&
 event.request.session.slice(-1)[0].challengeResult === false
 ) 
 // The user provided a wrong answer 3 times; fail auth
 event.response.issueTokens = false;
 event.response.failAuthentication = true;
 else if (
 event.request.session &&
 event.request.session.length &&
 event.request.session.slice(-1)[0].challengeResult === true
 ) 
 // The user provided the right answer; succeed auth
 event.response.issueTokens = true;
 event.response.failAuthentication = false;
 else 
 // The user did not provide a correct answer yet; present challenge
 event.response.issueTokens = false;
 event.response.failAuthentication = false;
 event.response.challengeName = 'CUSTOM_CHALLENGE';
 
 return event;
;

amazon-web-services authentication aws-lambda amazon-cognito

share|improve this question

edited Mar 27 at 2:14

John Rotenstein

90.5k88 gold badges103103 silver badges154154 bronze badges

asked Mar 26 at 11:33

Dinuka SalwathuraDinuka Salwathura

44766 silver badges2020 bronze badges

triggerSource: 'CreateAuthChallenge_Authentication',
request: 
 userAttributes: 
 sub: 'xxxxx-xxxxx-xxxx',
'cognito:user_status': 'CONFIRMED',
name: 'sala',
phone_number_verified: 'true',
'cognito:phone_number_alias': '+947xxxxxxxxx',
phone_number: '+947xxxxxxxxx' ,
challengeName: 'CUSTOM_CHALLENGE',
session: [] ,

exports.handler = async event => 
 if (
 event.request.session &&
 event.request.session.length >= 3 &&
 event.request.session.slice(-1)[0].challengeResult === false
 ) 
 // The user provided a wrong answer 3 times; fail auth
 event.response.issueTokens = false;
 event.response.failAuthentication = true;
 else if (
 event.request.session &&
 event.request.session.length &&
 event.request.session.slice(-1)[0].challengeResult === true
 ) 
 // The user provided the right answer; succeed auth
 event.response.issueTokens = true;
 event.response.failAuthentication = false;
 else 
 // The user did not provide a correct answer yet; present challenge
 event.response.issueTokens = false;
 event.response.failAuthentication = false;
 event.response.challengeName = 'CUSTOM_CHALLENGE';
 
 return event;
;

share|improve this question

edited Mar 27 at 2:14

John Rotenstein

90.5k88 gold badges103103 silver badges154154 bronze badges

asked Mar 26 at 11:33

Dinuka SalwathuraDinuka Salwathura

44766 silver badges2020 bronze badges

share|improve this question

edited Mar 27 at 2:14

John Rotenstein

90.5k88 gold badges103103 silver badges154154 bronze badges

asked Mar 26 at 11:33

Dinuka SalwathuraDinuka Salwathura

44766 silver badges2020 bronze badges

edited Mar 27 at 2:14

John Rotenstein

90.5k88 gold badges103103 silver badges154154 bronze badges

edited Mar 27 at 2:14

John Rotenstein

90.5k88 gold badges103103 silver badges154154 bronze badges

asked Mar 26 at 11:33

Dinuka SalwathuraDinuka Salwathura

44766 silver badges2020 bronze badges

asked Mar 26 at 11:33

Dinuka SalwathuraDinuka Salwathura

44766 silver badges2020 bronze badges