Use UpdateUserPool with an AWS SDK or CLI

To update a user pool

The following update-user-pool example modifies a user pool with example syntax for each of the available configuration options. To update a user pool, you must specify all previously-configured options or they will reset to a default value.

aws cognito-idp update-user-pool --user-pool-id us-west-2_EXAMPLE \
    --policies PasswordPolicy=\{MinimumLength=6,RequireUppercase=true,RequireLowercase=true,RequireNumbers=true,RequireSymbols=true,TemporaryPasswordValidityDays=7\} \
    --deletion-protection ACTIVE \
    --lambda-config PreSignUp="arn:aws:lambda:us-west-2:123456789012:function:cognito-test-presignup-function",PreTokenGeneration="arn:aws:lambda:us-west-2:123456789012:function:cognito-test-pretoken-function" \
    --auto-verified-attributes "phone_number" "email" \
    --verification-message-template \{\"SmsMessage\":\""Your code is {####}"\",\"EmailMessage\":\""Your code is {####}"\",\"EmailSubject\":\""Your verification code"\",\"EmailMessageByLink\":\""Click {##here##} to verify your email address."\",\"EmailSubjectByLink\":\""Your verification link"\",\"DefaultEmailOption\":\"CONFIRM_WITH_LINK\"\} \
    --sms-authentication-message "Your code is {####}" \
    --user-attribute-update-settings AttributesRequireVerificationBeforeUpdate="email","phone_number" \
    --mfa-configuration "OPTIONAL" \
    --device-configuration ChallengeRequiredOnNewDevice=true,DeviceOnlyRememberedOnUserPrompt=true \
    --email-configuration SourceArn="arn:aws:ses:us-west-2:123456789012:identity/admin@example.com",ReplyToEmailAddress="amdin+noreply@example.com",EmailSendingAccount=DEVELOPER,From="admin@amazon.com",ConfigurationSet="test-configuration-set" \
    --sms-configuration SnsCallerArn="arn:aws:iam::123456789012:role/service-role/SNS-SMS-Role",ExternalId="12345",SnsRegion="us-west-2" \
    --admin-create-user-config AllowAdminCreateUserOnly=false,InviteMessageTemplate=\{SMSMessage=\""Welcome {username}. Your confirmation code is {####}"\",EmailMessage=\""Welcome {username}. Your confirmation code is {####}"\",EmailSubject=\""Welcome to MyMobileGame"\"\} \
    --user-pool-tags "Function"="MyMobileGame","Developers"="Berlin" \
    --admin-create-user-config AllowAdminCreateUserOnly=false,InviteMessageTemplate=\{SMSMessage=\""Welcome {username}. Your confirmation code is {####}"\",EmailMessage=\""Welcome {username}. Your confirmation code is {####}"\",EmailSubject=\""Welcome to MyMobileGame"\"\} \
    --user-pool-add-ons AdvancedSecurityMode="AUDIT" \
    --account-recovery-setting RecoveryMechanisms=\[\{Priority=1,Name="verified_email"\},\{Priority=2,Name="verified_phone_number"\}\]

This command produces no output.

For more information, see Updating user pool configuration in the Amazon Cognito Developer Guide.

import (
	"context"
	"errors"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider"
	"github.com/aws/aws-sdk-go-v2/service/cognitoidentityprovider/types"
)

type CognitoActions struct {
	CognitoClient *cognitoidentityprovider.Client
}



// Trigger and TriggerInfo define typed data for updating an Amazon Cognito trigger.
type Trigger int

const (
	PreSignUp Trigger = iota
	UserMigration
	PostAuthentication
)

type TriggerInfo struct {
	Trigger    Trigger
	HandlerArn *string
}

// UpdateTriggers adds or removes Lambda triggers for a user pool. When a trigger is specified with a `nil` value,
// it is removed from the user pool.
func (actor CognitoActions) UpdateTriggers(ctx context.Context, userPoolId string, triggers ...TriggerInfo) error {
	output, err := actor.CognitoClient.DescribeUserPool(ctx, &cognitoidentityprovider.DescribeUserPoolInput{
		UserPoolId: aws.String(userPoolId),
	})
	if err != nil {
		log.Printf("Couldn't get info about user pool %v. Here's why: %v\n", userPoolId, err)
		return err
	}
	lambdaConfig := output.UserPool.LambdaConfig
	for _, trigger := range triggers {
		switch trigger.Trigger {
		case PreSignUp:
			lambdaConfig.PreSignUp = trigger.HandlerArn
		case UserMigration:
			lambdaConfig.UserMigration = trigger.HandlerArn
		case PostAuthentication:
			lambdaConfig.PostAuthentication = trigger.HandlerArn
		}
	}
	_, err = actor.CognitoClient.UpdateUserPool(ctx, &cognitoidentityprovider.UpdateUserPoolInput{
		UserPoolId:   aws.String(userPoolId),
		LambdaConfig: lambdaConfig,
	})
	if err != nil {
		log.Printf("Couldn't update user pool %v. Here's why: %v\n", userPoolId, err)
	}
	return err
}

/**
 * Connect a Lambda function to the PreSignUp trigger for a Cognito user pool
 * @param {{ region: string, userPoolId: string, handlerArn: string }} config
 * @returns {Promise<[import("@aws-sdk/client-cognito-identity-provider").UpdateUserPoolCommandOutput | null, unknown]>}
 */
export const addPreSignUpHandler = async ({
  region,
  userPoolId,
  handlerArn,
}) => {
  try {
    const cognitoClient = new CognitoIdentityProviderClient({
      region,
    });

    const command = new UpdateUserPoolCommand({
      UserPoolId: userPoolId,
      LambdaConfig: {
        PreSignUp: handlerArn,
      },
    });

    const response = await cognitoClient.send(command);
    return [response, null];
  } catch (err) {
    return [null, err];
  }
};