要在AWS Cognito中实现自定义的重新发送代码挑战，您可以按照以下步骤操作：

1. 创建一个AWS Cognito用户池。

import boto3

client = boto3.client('cognito-idp')

response = client.create_user_pool(
    PoolName='custom-pool',
    AutoVerifiedAttributes=['email'],
    Policies={
        'PasswordPolicy': {
            'MinimumLength': 8,
            'RequireLowercase': True,
            'RequireUppercase': True,
            'RequireNumbers': True,
            'RequireSymbols': True,
            'TemporaryPasswordValidityDays': 7
        }
    },
    EmailVerificationSubject='Verify your email for our app',
    EmailVerificationMessage='Please click the link below to verify your email address: {####}',
    SmsVerificationMessage='Your verification code for our app is {####}.',
    SmsAuthenticationMessage='Your authentication code for our app is {####}.',
    UserPoolTags={
        'Key': 'Value'
    },
    AdminCreateUserConfig={
        'AllowAdminCreateUserOnly': False,
        'UnusedAccountValidityDays': 30,
        'InviteMessageTemplate': {
            'SMSMessage': 'Your username is {username} and temporary password is {####}.',
            'EmailMessage': 'Your username is {username} and temporary password is {####}.',
            'EmailSubject': 'Your temporary password'
        },
        'UnusedAccountValidityDays': 30,
        'UnusedAccountValidityDays': 30
    }
)

user_pool_id = response['UserPool']['Id']

2. 创建一个自定义的挑战触发器。

import json

def trigger_custom_challenge(event, context):
    response = {
        'challengeName': 'CUSTOM_CHALLENGE',
        'issueTokens': False,
        'failAuthentication': False
    }
    
    if event['request']['session']['challengeName'] == 'CUSTOM_CHALLENGE' and event['request']['session']['challengeResult'] == 'FAIL':
        response['failAuthentication'] = True
        
    return response

3. 将自定义挑战触发器绑定到用户池中。

response = client.create_user_pool_client(
    UserPoolId=user_pool_id,
    ClientName='custom-client',
    GenerateSecret=False,
    RefreshTokenValidity=30,
    ReadAttributes=['email'],
    WriteAttributes=['email'],
    ExplicitAuthFlows=['ADMIN_NO_SRP_AUTH'],
    SupportedIdentityProviders=['COGNITO'],
    CallbackURLs=['https://example.com'],
    LogoutURLs=['https://example.com'],
    PreventUserExistenceErrors='ENABLED',
    AllowedOAuthFlows=['implicit'],
    AllowedOAuthScopes=['openid'],
    AllowedOAuthFlowsUserPoolClient=True,
    AnalyticsConfiguration={
        'ApplicationId': 'your-application-id',
        'RoleArn': 'your-role-arn',
        'ExternalId': 'your-external-id',
        'UserDataShared': True
    },
    PreventUserExistenceErrors='ENABLED',
    SupportedIdentityProviders=['COGNITO'],
    CallbackURLs=['https://example.com'],
    LogoutURLs=['https://example.com'],
    AllowedOAuthFlows=['implicit'],
    AllowedOAuthScopes=['openid'],
    AllowedOAuthFlowsUserPoolClient=True
)

user_pool_client_id = response['UserPoolClient']['ClientId']

response = client.create_user_pool_domain(
    Domain='custom-domain',
    UserPoolId=user_pool_id
)

4. 更新用户池配置以启用自定义挑战模式。

response = client.update_user_pool(
    UserPoolId=user_pool_id,
    LambdaConfig={
        'CustomMessage': 'arn:aws:lambda:us-west-2:123456789012:function:custom-message',
        'PreSignUp': 'arn:aws:lambda:us-west-2:123456789012:function:pre-signup',
        'PostConfirmation': 'arn:aws:lambda:us-west-2:123456789012:function:post-confirmation',
        'PreAuthentication': 'arn:aws:lambda:us-west-2:123456789012:function:pre-authentication',
        'PostAuthentication': 'arn:aws:lambda:us-west-2:123456789012:function:post-authentication',
        'DefineAuthChallenge': 'arn:aws:lambda:us-west-2:123456789012:function:define-auth-challenge',
        'CreateAuthChallenge': 'arn:aws:lambda:us-west-2:123456789012:function:create-auth-challenge',
        'VerifyAuthChallengeResponse': 'arn:aws:lambda:us-west-