original file name: Codeium Chat - KYUbMbB9IjmXmLtzQYb1uz24knevHqwc.md summary: In the provided code snippet, you have defined the LambdaConfig interface to standardize the configuration for Lambda functions. Here are some points to consider for smoother parameter passing and usage:

Scope: You're instantiating cognito.UserPool outside the Stack class, leading to an issue with this context. Move the user pool creation into the HandTermCdkStack constructor or a method within the class.
Context: When defining variables outside the class instance, be mindful of the available context. For instance, initializing userPool and userPoolClient outside the class may not have access to the necessary context, such as the constructor arguments.
Parameter Passing: Since the LambdaConfig interface is defined at the top level, you can pass instances of LambdaConfig directly to functions or methods that utilize it.
Dependency Injection: Ideally, pass the necessary dependencies to the functions that need them rather than relying on external variables. For example, pass the userPoolClient instance or its properties to functions that require it for Lambda creation.
Encapsulation: Encapsulate logical sections of your code into methods or classes within the HandTermCdkStack class for better organization and access to class members.
Enable Context Access: To access the CDK context within a class method, ensure that the class instance is properly constructed and the method is defined within the class scope.

By reorganizing your code to leverage the class instance for context and encapsulating related functionality within class methods, you can simplify parameter passing and enhance the maintainability of your codebase. date: 2024-07-04T10:10

Codeium Chat Conversation

Note: This is purely the output of the chat conversation and does not contain any raw data, codebase snippets, etc. used to generate the output.

User at 10:10 am, Jul 4, 2024

I need to start thinking about optimizing code abstraction in my cdk-stack:

// cdk/lib/cdk-stack.ts
import { ENDPOINTS } from '../lambda/cdkshared/endpoints';
import {
 aws_cognito as cognito,
 aws_s3 as s3,
 aws_lambda as lambda,
 aws_iam as iam,
 aws_apigatewayv2 as apigatewayv2,
 aws_apigatewayv2_integrations as apigatewayv2Integrations,
 App,
 CfnOutput,
 Stack,
 aws_apigatewayv2_authorizers as apigatewayv2authorizers,
 StackProps
} from "aws-cdk-lib";
import { Construct } from 'constructs';
import { HttpMethod, HttpApi, CorsHttpMethod } from 'aws-cdk-lib/aws-apigatewayv2';
import { HttpLambdaIntegration } from 'aws-cdk-lib/aws-apigatewayv2-integrations'; // This path is illustrative and likely incorrect
import { HttpLambdaAuthorizer } from 'aws-cdk-lib/aws-apigatewayv2-authorizers';
import { IFunction } from 'aws-cdk-lib/aws-lambda';

const nodeRuntime = lambda.Runtime.NODEJS_16_X;

export class HandTermCdkStack extends Stack {
 constructor(
  scope: Construct,
  id: string,
  props?: StackProps
 ) {
  super(scope, id, props);
  // Cognito User Pool
  const userPool = new cognito.UserPool(this, 'HandTermUserPool', {
   userPoolName: 'HandTermUserPool',
   selfSignUpEnabled: true,
   userVerification: {
    emailSubject: 'Verify your email for our app!',
    emailBody: 'Hello {username}, Thanks for signing up to our app! Your verification code is {####}',
    emailStyle: cognito.VerificationEmailStyle.CODE,
   },
   signInAliases: {
    email: true
   },
   passwordPolicy: {
    minLength: 8,
    requireUppercase: true,
    requireLowercase: true,
    requireDigits: true,
    requireSymbols: true,
   },
   autoVerify: { email: true }
  });

  // TODO: Remove this before production. This is only to make signup easier during development
  const preSignupLambda = new lambda.Function(this, 'PreSignupLambda', {
   runtime: nodeRuntime,
   handler: 'preSignup.handler',
   code: lambda.Code.fromAsset('lambda/authentication'),
  });
  userPool.addTrigger(cognito.UserPoolOperation.PRE_SIGN_UP, preSignupLambda);

  // Cognito User Pool Client
  const userPoolClient = userPool.addClient('AppClient', {
   authFlows: {
    userSrp: true,
    userPassword: true // Enable USER_PASSWORD_AUTH flow
   },
   generateSecret: false,
   // Add your API Gateway endpoint URL to the list of callback URLs
  });

  // Cognito Identity Pool
  const identityPool = new cognito.CfnIdentityPool(this, 'HandTermIdentityPool', {
   identityPoolName: 'HandTermIdentityPool',
   allowUnauthenticatedIdentities: false,
   cognitoIdentityProviders: [{
    clientId: userPoolClient.userPoolClientId,
    providerName: userPool.userPoolProviderName,
   }],
  });

  // S3 Bucket for User Logs
  const logsBucket = new s3.Bucket(this, 'HandTermHistoryBucket', {
   bucketName: ENDPOINTS.aws.s3.bucketName,
   blockPublicAccess: s3.BlockPublicAccess.BLOCK_ALL,
   encryption: s3.BucketEncryption.S3_MANAGED,
  });

  // Lambda Execution Role
  const lambdaExecutionRole = new iam.Role(this, 'LambdaExecutionRole', {
   assumedBy: new iam.CompositePrincipal(
    new iam.ServicePrincipal('lambda.amazonaws.com'),
    new iam.ServicePrincipal('edgelambda.amazonaws.com')
   ),
   managedPolicies: [
    iam.ManagedPolicy.fromAwsManagedPolicyName('service-role/AWSLambdaBasicExecutionRole'),
    iam.ManagedPolicy.fromAwsManagedPolicyName('AmazonS3FullAccess'),
   ],
  });

  const authorizerLambda: IFunction = new lambda.Function(this, 'AuthorizerFunction', {
   runtime: nodeRuntime,
   handler: 'authorizer.handler',
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_USER_POOL_ID: userPool.userPoolId
   }
  });

  // Define the authorizer with the correct constructor arguments
  const lambdaAuthorizer = new HttpLambdaAuthorizer('CustomAuthorizer', authorizerLambda, {
   identitySource: ['$request.header.Authorization']
  });

  // Define the HTTP API
  const httpApi = new HttpApi(this, 'HandTermApi', {
   apiName: 'HandTermService',
   description: 'This service serves authentication requests.',
   // CORS configuration if needed
   corsPreflight: {
    allowOrigins: ['http://localhost:5173', 'https://handterm.com'],
    allowMethods: [CorsHttpMethod.GET, CorsHttpMethod.POST, CorsHttpMethod.OPTIONS],
    allowHeaders: ['Content-Type', 'Authorization'],
    allowCredentials: true,
   },
  });

  const signUpLambda = new lambda.Function(this, 'SignUpFunction', {
   runtime: nodeRuntime,
   handler: 'signUp.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const signUpIntegration = new HttpLambdaIntegration('signup-integration', signUpLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.SignUp,
   methods: [HttpMethod.POST],
   integration: signUpIntegration,
  })

  const signInLambda = new lambda.Function(this, 'SignInFunction', {
   runtime: nodeRuntime,
   handler: 'signIn.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });

  httpApi.addRoutes({
   path: ENDPOINTS.api.SignIn,
   methods: [HttpMethod.POST],
   integration: new HttpLambdaIntegration(
    'post-user-signin',
    signInLambda
   ),
  })

  const refreshTokenLambda = new lambda.Function(this, 'RefreshTokenFunction', {
   runtime: nodeRuntime,
   handler: 'refreshToken.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });

  httpApi.addRoutes({
   path: ENDPOINTS.api.RefreshToken,
   methods: [HttpMethod.POST],
   integration: new HttpLambdaIntegration(
    'post-user-signin',
    refreshTokenLambda
   ),
  })

  const changePasswordLambda = new lambda.Function(this, 'ChangePasswordFunction', {
   runtime: nodeRuntime,
   handler: 'changePassword.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const changePasswordIntegration = new HttpLambdaIntegration('change-password-integration', changePasswordLambda);

  httpApi.addRoutes({
   path: ENDPOINTS.api.ChangePassword,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: changePasswordIntegration,
  })

  const getUserLambda = new lambda.Function(this, 'GetUserFunction', {
   runtime: nodeRuntime,
   handler: 'getUser.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const getUserIntegration = new HttpLambdaIntegration('get-user-integration', getUserLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.GetUser,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.GET],
   integration: getUserIntegration,
  })

  const setUserLambda = new lambda.Function(this, 'SetUserFunction', {
   runtime: nodeRuntime,
   handler: 'setUser.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const setUserIntegration = new HttpLambdaIntegration('set-user-integration', setUserLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.SetUser,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: setUserIntegration,
  })

  const saveLogLambda = new lambda.Function(this, 'SaveLogFunction', {
   runtime: nodeRuntime,
   handler: 'saveLog.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const saveLogIntegration = new HttpLambdaIntegration('save-log-integration', saveLogLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.SaveLog,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: saveLogIntegration,
  })

  const getLogLambda = new lambda.Function(this, 'GetLogFunction', {
   runtime: nodeRuntime,
   handler: 'getLog.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const getLogIntegration = new HttpLambdaIntegration('get-log-integration', getLogLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.GetLog,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: getLogIntegration,
  })

  const listLogLambda = new lambda.Function(this, 'ListLogFunction', {
   runtime: nodeRuntime,
   handler: 'listLog.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const listLogIntegration = new HttpLambdaIntegration('list-log-integration', listLogLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.ListLog,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: listLogIntegration,
  })

  // Outputs
  new CfnOutput(this, 'UserPoolId', { value: userPool.userPoolId });
  new CfnOutput(this, 'UserPoolClientId', { value: userPoolClient.userPoolClientId });
  new CfnOutput(this, 'IdentityPoolId', { value: identityPool.ref });
  new CfnOutput(this, 'BucketName', { value: logsBucket.bucketName });
  new CfnOutput(this, 'ApiEndpoint', { value: httpApi.url || '' });
 }
}

const app = new App();
new HandTermCdkStack(app, 'HandTermCdkStack');

I can abstract out the lambda creation and adding them to the API into a function, probably, but I also want your expert opinion on any other abstractions I might be able to take advantage of like generics or interfaces, if they improve the code. I don't want to use them just to use the technology.

Codeium at 10:10 am, Jul 4, 2024

Optimizing code abstraction in your cdk-stack.ts can significantly enhance readability, maintainability, and reusability. Here are several strategies tailored to your existing codebase to achieve these goals:

1. Abstract Lambda Creation

Given the repetitive nature of Lambda function creation in your stack, abstracting this process into a reusable function can reduce duplication. This function can take parameters for the unique aspects of each Lambda (e.g., handler name, code path, specific environment variables).

interface LambdaConfig {
  functionName: string;
  handler: string;
  codePath: string;
  additionalEnvironment?: { [key: string]: string };
}

function createLambda(scope: Construct, config: LambdaConfig, role: iam.Role, runtime: lambda.Runtime): lambda.Function {
  return new lambda.Function(scope, config.functionName, {
    runtime: runtime,
    handler: config.handler,
    role: role,
    code: lambda.Code.fromAsset(config.codePath),
    environment: {
      COGNITIO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
      ...config.additionalEnvironment,
    },
  });
}

2. Abstract API Route Creation

Similarly, the process of adding routes to your HTTP API is repetitive and can be abstracted. This function could accept parameters for path, method, integration, and optionally an authorizer.

function addApiRoute(httpApi: HttpApi, config: {
  path: string,
  methods: HttpMethod[],
  integration: HttpLambdaIntegration,
  authorizer?: HttpLambdaAuthorizer
}) {
  httpApi.addRoutes({
    path: config.path,
    methods: config.methods,
    integration: config.integration,
    authorizer: config.authorizer,
  });
}

3. Utilize Interfaces for Configuration

For larger, more complex constructs or when integrating with multiple AWS services, defining TypeScript interfaces can help manage configurations more effectively. For example, you could define an interface for your Cognito setup or API Gateway configuration, ensuring consistency and readability.

4. Construct Classes for Grouped Resources

For tightly coupled resources, consider creating custom Construct classes. For instance, if a Lambda function always goes with a specific type of API Gateway route, you could create a Construct that encapsulates both resources.

class SecureApiLambda extends Construct {
  constructor(scope: Construct, id: string, config: {
    lambdaConfig: LambdaConfig,
    httpApi: HttpApi,
    path: string,
    httpMethod: HttpMethod,
    runtime: lambda.Runtime,
    role: iam.Role
  }) {
    super(scope, id);

    const lambda = createLambda(this, config.lambdaConfig, config.role, config.runtime);
    const integration = new HttpLambdaIntegration(`${id}-integration`, lambda);
    addApiApiRoute(config.httpApi, {
      path: config.path,
      methods: [config.httpMethod],
      integration: integration,
      // Assuming authorizer is globally available or passed in config
      authorizer: lambdaAuthorizer,
    });
  }
}

5. Encapsulate Common Patterns

If you identify any other repetitive patterns or configurations, encapsulate them into functions or classes. For example, if your Lambdas share a common IAM role, consider creating a function to generate this role rather than defining it inline for every Lambda.

General Advice

Abstraction should simplify your code, not complicate it. Each abstraction layer you introduce should have a clear purpose and should be used consistently throughout your codebase. If an abstraction only applies to a single use case, it might not be necessary.

By adopting these strategies, you'll be leveraging TypeScript's powerful features to create a more organized, maintainable, and scalable infrastructure codebase.

User at 10:43 am, Jul 4, 2024

I am trying to abstract out the code as you suggested.

I've created the class and the other functions out of the Stack class so that I later might be able to put them into a different file, but I am having some trouble passing the right parameters in:

// cdk/lib/cdk-stack.ts
import { ENDPOINTS } from '../lambda/cdkshared/endpoints';
import {
 aws_cognito as cognito,
 aws_s3 as s3,
 aws_lambda as lambda,
 aws_iam as iam,
 aws_apigatewayv2 as apigatewayv2,
 aws_apigatewayv2_integrations as apigatewayv2Integrations,
 App,
 CfnOutput,
 Stack,
 aws_apigatewayv2_authorizers as apigatewayv2authorizers,
 StackProps
} from "aws-cdk-lib";
import { Construct } from 'constructs';
import { HttpMethod, HttpApi, CorsHttpMethod } from 'aws-cdk-lib/aws-apigatewayv2';
import { HttpLambdaIntegration } from 'aws-cdk-lib/aws-apigatewayv2-integrations'; // This path is illustrative and likely incorrect
import { HttpLambdaAuthorizer } from 'aws-cdk-lib/aws-apigatewayv2-authorizers';
import { IFunction } from 'aws-cdk-lib/aws-lambda';

const nodeRuntime = lambda.Runtime.NODEJS_16_X;

interface LambdaConfig {
 functionName: string;
 handler: string;
 codePath: string;
 additionalEnvironment?: { [key: string]: string };
}

// Cognito User Pool
const userPool = new cognito.UserPool(this, 'HandTermUserPool', {
 userPoolName: 'HandTermUserPool',
 selfSignUpEnabled: true,
 userVerification: {
  emailSubject: 'Verify your email for our app!',
  emailBody: 'Hello {username}, Thanks for signing up to our app! Your verification code is {####}',
  emailStyle: cognito.VerificationEmailStyle.CODE,
 },
 signInAliases: {
  email: true
 },
 passwordPolicy: {
  minLength: 8,
  requireUppercase: true,
  requireLowercase: true,
  requireDigits: true,
  requireSymbols: true,
 },
 autoVerify: { email: true }
});


// Cognito User Pool Client
const userPoolClient = userPool.addClient('AppClient', {
 authFlows: {
  userSrp: true,
  userPassword: true // Enable USER_PASSWORD_AUTH flow
 },
 generateSecret: false,
 // Add your API Gateway endpoint URL to the list of callback URLs
});
const createLambda = (scope: Construct, config: LambdaConfig, role: iam.Role, runtime: lambda.Runtime): lambda.Function => {
 return new lambda.Function(scope, config.functionName, {
  runtime: runtime,
  handler: config.handler,
  role: role,
  code: lambda.Code.fromAsset(config.codePath),
  environment: {
   COGNITIO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   ...config.additionalEnvironment,
  },
 });
}

const addApiRoute = (httpApi: HttpApi, config: {
 path: string,
 methods: HttpMethod[],
 integration: HttpLambdaIntegration,
 authorizer?: HttpLambdaAuthorizer
}) => {
 httpApi.addRoutes({
  path: config.path,
  methods: config.methods,
  integration: config.integration,
  authorizer: config.authorizer,
 });
}
class SecureApiLambda extends Construct {
 constructor(scope: Construct, id: string, config: {
  lambdaConfig: LambdaConfig,
  httpApi: HttpApi,
  path: string,
  httpMethod: HttpMethod,
  runtime: lambda.Runtime,
  role: iam.Role
 }) {
  super(scope, id);

  const lambda = createLambda(this, config.lambdaConfig, config.role, config.runtime);
  const integration = new HttpLambdaIntegration(`${id}-integration`, lambda);
  addApiRoute(config.httpApi, {
   path: config.path,
   methods: [config.httpMethod],
   integration: integration,
   // Assuming authorizer is globally available or passed in config
   authorizer: lambdaAuthorizer,
  });
 }
}

export class HandTermCdkStack extends Stack {
 constructor(
  scope: Construct,
  id: string,
  props?: StackProps
 ) {
  super(scope, id, props);

  // Cognito Identity Pool
  const identityPool = new cognito.CfnIdentityPool(this, 'HandTermIdentityPool', {
   identityPoolName: 'HandTermIdentityPool',
   allowUnauthenticatedIdentities: false,
   cognitoIdentityProviders: [{
    clientId: userPoolClient.userPoolClientId,
    providerName: userPool.userPoolProviderName,
   }],
  });

  // TODO: Remove this before production. This is only to make signup easier during development
  const preSignupLambda = new lambda.Function(this, 'PreSignupLambda', {
   runtime: nodeRuntime,
   handler: 'preSignup.handler',
   code: lambda.Code.fromAsset('lambda/authentication'),
  });
  userPool.addTrigger(cognito.UserPoolOperation.PRE_SIGN_UP, preSignupLambda);
  // S3 Bucket for User Logs
  const logsBucket = new s3.Bucket(this, 'HandTermHistoryBucket', {
   bucketName: ENDPOINTS.aws.s3.bucketName,
   blockPublicAccess: s3.BlockPublicAccess.BLOCK_ALL,
   encryption: s3.BucketEncryption.S3_MANAGED,
  });

  // Lambda Execution Role
  const lambdaExecutionRole = new iam.Role(this, 'LambdaExecutionRole', {
   assumedBy: new iam.CompositePrincipal(
    new iam.ServicePrincipal('lambda.amazonaws.com'),
    new iam.ServicePrincipal('edgelambda.amazonaws.com')
   ),
   managedPolicies: [
    iam.ManagedPolicy.fromAwsManagedPolicyName('service-role/AWSLambdaBasicExecutionRole'),
    iam.ManagedPolicy.fromAwsManagedPolicyName('AmazonS3FullAccess'),
   ],
  });


  const authorizerLambda: IFunction = new lambda.Function(this, 'AuthorizerFunction', {
   runtime: nodeRuntime,
   handler: 'authorizer.handler',
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_USER_POOL_ID: userPool.userPoolId
   }
  });

  // Define the authorizer with the correct constructor arguments
  const lambdaAuthorizer = new HttpLambdaAuthorizer('CustomAuthorizer', authorizerLambda, {
   identitySource: ['$request.header.Authorization']
  });

  // Define the HTTP API
  const httpApi = new HttpApi(this, 'HandTermApi', {
   apiName: 'HandTermService',
   description: 'This service serves authentication requests.',
   // CORS configuration if needed
   corsPreflight: {
    allowOrigins: ['http://localhost:5173', 'https://handterm.com'],
    allowMethods: [CorsHttpMethod.GET, CorsHttpMethod.POST, CorsHttpMethod.OPTIONS],
    allowHeaders: ['Content-Type', 'Authorization'],
    allowCredentials: true,
   },
  });

  const signUpLambda = new lambda.Function(this, 'SignUpFunction', {
   runtime: nodeRuntime,
   handler: 'signUp.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const signUpIntegration = new HttpLambdaIntegration('signup-integration', signUpLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.SignUp,
   methods: [HttpMethod.POST],
   integration: signUpIntegration,
  })

  const signInLambda = new lambda.Function(this, 'SignInFunction', {
   runtime: nodeRuntime,
   handler: 'signIn.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });

  httpApi.addRoutes({
   path: ENDPOINTS.api.SignIn,
   methods: [HttpMethod.POST],
   integration: new HttpLambdaIntegration(
    'post-user-signin',
    signInLambda
   ),
  })

  const refreshTokenLambda = new lambda.Function(this, 'RefreshTokenFunction', {
   runtime: nodeRuntime,
   handler: 'refreshToken.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });

  httpApi.addRoutes({
   path: ENDPOINTS.api.RefreshToken,
   methods: [HttpMethod.POST],
   integration: new HttpLambdaIntegration(
    'post-user-signin',
    refreshTokenLambda
   ),
  })

  const changePasswordLambda = new lambda.Function(this, 'ChangePasswordFunction', {
   runtime: nodeRuntime,
   handler: 'changePassword.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const changePasswordIntegration = new HttpLambdaIntegration('change-password-integration', changePasswordLambda);

  httpApi.addRoutes({
   path: ENDPOINTS.api.ChangePassword,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: changePasswordIntegration,
  })

  const getUserLambda = new lambda.Function(this, 'GetUserFunction', {
   runtime: nodeRuntime,
   handler: 'getUser.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const getUserIntegration = new HttpLambdaIntegration('get-user-integration', getUserLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.GetUser,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.GET],
   integration: getUserIntegration,
  })

  const setUserLambda = new lambda.Function(this, 'SetUserFunction', {
   runtime: nodeRuntime,
   handler: 'setUser.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const setUserIntegration = new HttpLambdaIntegration('set-user-integration', setUserLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.SetUser,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: setUserIntegration,
  })

  const saveLogLambda = new lambda.Function(this, 'SaveLogFunction', {
   runtime: nodeRuntime,
   handler: 'saveLog.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const saveLogIntegration = new HttpLambdaIntegration('save-log-integration', saveLogLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.SaveLog,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: saveLogIntegration,
  })

  const getLogLambda = new lambda.Function(this, 'GetLogFunction', {
   runtime: nodeRuntime,
   handler: 'getLog.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const getLogIntegration = new HttpLambdaIntegration('get-log-integration', getLogLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.GetLog,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: getLogIntegration,
  })

  const listLogLambda = new lambda.Function(this, 'ListLogFunction', {
   runtime: nodeRuntime,
   handler: 'listLog.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/userStorage'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const listLogIntegration = new HttpLambdaIntegration('list-log-integration', listLogLambda);
  httpApi.addRoutes({
   path: ENDPOINTS.api.ListLog,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: listLogIntegration,
  })

  // Outputs
  new CfnOutput(this, 'UserPoolId', { value: userPool.userPoolId });
  new CfnOutput(this, 'UserPoolClientId', { value: userPoolClient.userPoolClientId });
  new CfnOutput(this, 'IdentityPoolId', { value: identityPool.ref });
  new CfnOutput(this, 'BucketName', { value: logsBucket.bucketName });
  new CfnOutput(this, 'ApiEndpoint', { value: httpApi.url || '' });
 }
}

const app = new App();
new HandTermCdkStack(app, 'HandTermCdkStack');

I'm getting errors passing this into new cognito.UserPool() and the lambdaAuthorizer is not recognized in the SecureApiLambda.

Codeium at 10:43 am, Jul 4, 2024

The issues you're encountering stem from attempting to use this outside the context of a class and scope-related issues for lambdaAuthorizer. Let's address these problems:

Issue with `this` Outside Class Context

Your use of this outside the class context, specifically with new cognito.UserPool(this, 'HandTermUserPool', {...}), is causing an error because this is undefined outside of class methods or constructors in TypeScript. To resolve this, ensure that code requiring this is encapsulated within a class or function where this is defined. For shared resources like the Cognito User Pool, consider creating them inside the HandTermCdkStack class or a method that gets called from its constructor.

Unrecognized `lambdaAuthorizer`

The lambdaAuthorizer is not recognized in SecureApiLambda because it's defined within the HandTermCdkStack constructor and not passed to SecureApiLambda. To fix this, you need to pass lambdaAuthorizer as part of the configuration object for SecureApiLambda.

Proposed Solutions

Move Resource Creation Inside Classes or Functions

Move the creation of shared AWS resources (like Cognito User Pool and User Pool Client) inside the HandTermCdkStack class or into a function that is called from the constructor of HandTermCdkStack.

Pass `lambdaAuthorizer` to `SecureApiLambda`

Modify the configuration object for SecureApiLambda to include lambdaAuthorizer and pass it when creating instances of SecureApiLambda.

Here's an adjusted version of your code with these concepts applied:

export class HandTermCdkStack extends Stack {
  constructor(scope: Construct, id: string, props?: StackProps) {
    super(scope, id, props);

    // Resource creation moved inside the constructor
    const userPool = new cognito.UserPool(this, 'HandTermUserPool', {
      // Configuration omitted for brevity
    });

    const userPoolClient = userPool.addClient('AppClient', {
      // Configuration omitted for brevity
    });

    // Lambda Execution Role
    const lambdaExecutionRole = new iam.Role(this, 'LambdaExecutionRole', {
      // Configuration omitted for brevity
    });

    const authorizerLambda: IFunction = new lambda.Function(this, 'AuthorizerFunction', {
      // Configuration omitted for brevity
    });

    // Define the authorizer with the correct constructor arguments
    const lambdaAuthorizer = new HttpLambdaAuthorizer('CustomAuthorizer', authorizerLambda, {
      identitySource: ['$request.header.Authorization']
    });

    // HTTP API and other resources...
    const httpApi = new HttpApi(this, 'HandTermApi', {
      // Configuration omitted for brevity
    });

    // Usage of SecureApiLambda with lambdaAuthorizer passed in config
    new SecureApiLambda(this, 'ChangePasswordLambda', {
      lambdaConfig: {
        functionName: 'ChangePasswordFunction',
        handler: 'changePassword.handler',
        codePath: 'lambda/authentication',
        additionalEnvironment: {
          COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
        },
      },
      httpApi: httpApi,
      path: ENDPOINTS.api.ChangePassword,
      httpMethod: HttpMethod.POST,
      runtime: nodeRuntime,
      role: lambdaExecutionRole,
      authorizer: lambdaAuthorizer, // Pass lambdaAuthorizer here
    });

    // Outputs...
  }
}

Adjusting `SecureApiLambda` Constructor

Modify the SecureApiLambda constructor to accept lambdaAuthorizer:

interface SecureApiLambdaConfig {
  lambdaConfig: LambdaConfig;
  httpApi: HttpApi;
  path: string;
  httpMethod: HttpMethod;
  runtime: lambda.Runtime;
  role: iam.Role;
  authorizer: HttpLambdaAuthorizer; // Add this line
}

class SecureApiLambda extends Construct {
  constructor(scope: Construct, id: string, config: SecureApiLambdaConfig) {
    super(scope, id);
    // Lambda creation and API route addition logic...
  }
}

These adjustments ensure that you're correctly scoping and passing necessary resources and configurations within your CDK stack.

User at 11:11 am, Jul 4, 2024

I think all of that mgiht be over-engineering, at this point.

The way I determin that is that if I implement all that my file size will become larger. I want to make it go in the other direction.

I'm thinking of doing something like this:

  const createLambdaAndAddRoutes = (
   functionName: string, 
   handler: string, 
   codePath: string, 
   path: string,
   additionalEnvironment?: { [key: string]: string },
  ) => {
   const createLambda = new lambda.Function(this, functionName, {
    runtime: nodeRuntime,
    handler: handler,
    code: lambda.Code.fromAsset(codePath),
    environment: additionalEnvironment
   });
   const createIntegration = new HttpLambdaIntegration('${functionName}-integration', createLambda);
   httpApi.addRoutes({
    path: path,
    methods: [HttpMethod.POST],
    integration: createIntegration,
   })
  }

  createLambdaAndAddRoutes(
   'SignUpFunction', 'signUp.handler', 'lambda/authentication', 
   ENDPOINTS.api.SignUp,
   {COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId},
  );

Codeium at 11:11 am, Jul 4, 2024

Simplifying your approach to reduce complexity and file size is a pragmatic decision, especially when you're looking for straightforward solutions. The createLambdaAndAddRoutes function you've proposed is an effective way to abstract the repetitive process of creating Lambda functions and their corresponding API Gateway routes. This approach encapsulates the functionality into a single, reusable function, thereby reducing redundancy and improving the readability of your code.

However, there's a small correction needed in your template literal usage within the createIntegration variable. Template literals in JavaScript and TypeScript use backticks (`) instead of single quotes ('), and variable interpolation requires ${} syntax. Here's the corrected line:

const createIntegration = new HttpLambdaIntegration(`${functionName}-integration`, createLambda);

Here's your revised function with the correction:

const createLambdaAndAddRoutes = (
  functionName: string, 
  handler: string, 
  codePath: string, 
  path: string,
  additionalEnvironment?: { [key: string]: string },
) => {
  const createLambda = new lambda.Function(this, functionName, {
    runtime: nodeRuntime,
    handler: handler,
    code: lambda.Code.fromAsset(codePath),
    environment: {
      ...additionalEnvironment
    },
  });
  const createIntegration = new HttpLambdaIntegration(`${functionName}-integration`, createLambda);
  httpApi.addRoutes({
    path: path,
    methods: [HttpMethod.POST],
    integration: createIntegration,
  });
}

// Example usage
createLambdaAndAddRoutes(
  'SignUpFunction', 
  'signUp.handler', 
  'lambda/authentication', 
  ENDPOINTS.api.SignUp,
  { COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId },
);

This function significantly streamlines the process of setting up Lambdas with API Gateway. It abstracts away the boilerplate involved in creating Lambdas and adding them as routes, making your cdk-stack.ts more concise and manageable.

Remember, this function assumes that variables like httpApi, nodeRuntime, and userPoolClient are accessible within the scope it's called. Ensure these resources are defined appropriately in your HandTermCdkStack class or passed to the function as parameters if you decide to move the function outside the class scope or into a separate module for even cleaner code organization.

User at 11:21 am, Jul 4, 2024

I think there is a slight complication. Some routes require authorization, so I am thinking about doing this:

  const createLambdaAndAddRoutes = (
   functionName: string, 
   handler: string, 
   codePath: string, 
   path: string,
   useAuthorizer: boolean = true,
   additionalEnvironment?: { [key: string]: string },
  ) => {
   const createLambda = new lambda.Function(this, functionName, {
    runtime: nodeRuntime,
    handler: handler,
    code: lambda.Code.fromAsset(codePath),
    environment: additionalEnvironment
   });
   const createIntegration = new HttpLambdaIntegration(`${functionName}-integration`, createLambda);
   const baseRoute = { path: path, methods: [HttpMethod.POST], integration: createIntegration }
   const routeObject = useAuthorizer ? {...baseRoute, authorizer: lambdaAuthorizer} : baseRoute;
   httpApi.addRoutes(routeObject)
  }

Codeium at 11:21 am, Jul 4, 2024

Your updated createLambdaAndAddRoutes function with an option to include an authorizer for certain routes is a smart and flexible approach. It allows you to easily specify when a route should be protected by an authorizer, making your code more adaptable and reducing repetition.

Your implementation looks good, but ensure that lambdaAuthorizer is defined and accessible within the scope of this function. If lambdaAuthorizer is defined in the HandTermCdkStack class, you need to make sure it's accessible in the function scope—either by passing it as a parameter to the function or ensuring the function is defined in a context where lambdaAuthorizer is available.

Here's a slight modification to your function to include lambdaAuthorizer as a parameter, making the function more modular and self-contained:

const createLambdaAndAddRoutes = (
  functionName: string, 
  handler: string, 
  codePath: string, 
  path: string,
  lambdaAuthorizer: HttpLambdaAuthorizer | null,
  useAuthorizer: boolean = true,
  additionalEnvironment?: { [key: string]: string },
) => {
  const createLambda = new lambda.Function(this, functionName, {
    runtime: nodeRuntime,
    handler: handler,
    code: lambda.Code.fromAsset(codePath),
    environment: additionalEnvironment
  });

  const createIntegration = new HttpLambdaIntegration(`${functionName}-integration`, createLambda);
  const baseRoute = { path: path, methods: [HttpMethod.POST], integration: createIntegration };
  const routeObject = useAuthorizer && lambdaAuthorizer ? {...baseRoute, authorizer: lambdaAuthorizer} : baseRoute;
  httpApi.addRoutes(routeObject);
};

In this modified version:

lambdaAuthorizer is explicitly passed as a parameter. This change increases the function's flexibility and makes it more self-contained.
I added a check to ensure that useAuthorizer is true and lambdaAuthorizer is not null before adding it to the route object. This prevents potential issues where useAuthorizer might be true, but lambdaAuthorizer is null or undefined.

Remember to adjust your function calls accordingly, passing in the lambdaAuthorizer where needed:

createLambdaAndAddRoutes(
  'SignUpFunction', 
  'signUp.handler', 
  'lambda/authentication', 
  ENDPOINTS.api.SignUp,
  lambdaAuthorizer, // Assuming lambdaAuthorizer is defined
  true, // Use authorizer
  { COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId },
);

This approach keeps your code flexible and clear, allowing for easy adjustments to route authorization as your application evolves.

User at 11:25 am, Jul 4, 2024

lambdaAuthorizer is defined, but I like the idea of passing it in, in case I can ever move the function elsewhere.

But then why not omit useAuth and just do this:

  const createLambdaAndAddRoutes = (
   functionName: string,
   handler: string,
   codePath: string,
   path: string,
   lambdaAuthorizer: HttpLambdaAuthorizer | null,
   additionalEnvironment?: { [key: string]: string },
  ) => {
   const createLambda = new lambda.Function(this, functionName, {
    runtime: nodeRuntime,
    handler: handler,
    code: lambda.Code.fromAsset(codePath),
    environment: additionalEnvironment
   });
   const createIntegration = new HttpLambdaIntegration(`${functionName}-integration`, createLambda);
   const baseRoute = { path: path, methods: [HttpMethod.POST], integration: createIntegration }
   const routeObject = lambdaAuthorizer ? { ...baseRoute, authorizer: lambdaAuthorizer } : baseRoute;
   httpApi.addRoutes(routeObject)
  }

Codeium at 11:26 am, Jul 4, 2024

Omitting the useAuth parameter and directly checking if lambdaAuthorizer is null to decide whether to use an authorizer is an excellent simplification. This change makes the function's interface cleaner and its behavior more intuitive. Since the presence of a non-null lambdaAuthorizer inherently indicates the desire to use authorization, this approach reduces the need for an additional flag to control that behavior.

Your revised function is streamlined and effectively leverages the truthiness of lambdaAuthorizer to conditionally add authorization to routes. This also enhances the function's reusability and clarity, as it directly ties the addition of an authorizer to the presence of an authorizer object, making the function's behavior more transparent to future maintainers or when revisiting your own code.

Here's a quick recap of your updated function with these concepts applied:

const createLambdaAndAddRoutes = (
  functionName: string,
  handler: string,
  codePath: string,
  path: string,
  lambdaAuthorizer: HttpLambdaAuthorizer | null,
  additionalEnvironment?: { [key: string]: string },
) => {
  const createLambda = new lambda.Function(this, functionName, {
    runtime: nodeRuntime,
    handler: handler,
    code: lambda.Code.fromAsset(codePath),
    environment: additionalEnvironment
  });
  const createIntegration = new HttpLambdaIntegration(`${functionName}-integration`, createLambda);
  const baseRoute = { path: path, methods: [HttpMethod.POST], integration: createIntegration };
  const routeObject = lambdaAuthorizer ? { ...baseRoute, authorizer: lambdaAuthorizer } : baseRoute;
  httpApi.addRoutes(routeObject);
};

This streamlined approach allows you to easily manage which routes are protected by authorization without additional parameters. It's a good practice to keep functions and their interfaces as simple and intuitive as possible, reducing cognitive load and potential bugs.

User at 11:32 am, Jul 4, 2024

It looks like some of my Lambdas require other integrations.

Can you help me include that in the createLambdaAndAddRoutes

  createLambdaAndAddRoutes(
   'RefreshTokenFunction', 'refreshToken.handler', 'lambda/authentication',
   ENDPOINTS.api.RefreshToken,
   lambdaAuthorizer,
   { COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId },
  )

  const refreshTokenLambda = new lambda.Function(this, 'RefreshTokenFunction', {
   runtime: nodeRuntime,
   handler: 'refreshToken.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });

  httpApi.addRoutes({
   path: ENDPOINTS.api.RefreshToken,
   methods: [HttpMethod.POST],
   integration: new HttpLambdaIntegration(
    'post-user-signin',
    refreshTokenLambda
   ),
  })

  const changePasswordLambda = new lambda.Function(this, 'ChangePasswordFunction', {
   runtime: nodeRuntime,
   handler: 'changePassword.handler',
   role: lambdaExecutionRole,
   code: lambda.Code.fromAsset('lambda/authentication'),
   environment: {
    COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId,
   }
  });
  const changePasswordIntegration = new HttpLambdaIntegration('change-password-integration', changePasswordLambda);

  httpApi.addRoutes({
   path: ENDPOINTS.api.ChangePassword,
   authorizer: lambdaAuthorizer,
   methods: [HttpMethod.POST],
   integration: changePasswordIntegration,
  })

Codeium at 11:32 am, Jul 4, 2024

To accommodate different integrations within the createLambdaAndAddRoutes function, you can expand its design to allow specifying the type of integration or even passing in a custom integration object. Since you're using HttpLambdaIntegration for the majority of your routes but mentioned the need for "other integrations," I'll assume you want a flexible way to define which integration to use for each route.

One approach is to modify the function to accept an integration type or a custom integration object. For simplicity and to maintain the focus on the common case (HttpLambdaIntegration), you might start by adding an optional parameter that allows specifying a custom integration. If a custom integration is not provided, the function defaults to using HttpLambdaIntegration.

Here's how you can adjust your function:

import { IIntegration } from 'aws-cdk-lib/aws-apigatewayv2'; // Ensure you have the correct import for IIntegration

const createLambdaAndAddRoutes = (
  functionName: string,
  handler: string,
  codePath: string,
  path: string,
  lambdaAuthorizer: HttpLambdaAuthorizer | null,
  additionalEnvironment?: { [key: string]: string },
  customIntegration?: IIntegration, // Optional parameter for custom integration
) => {
  const createLambda = new lambda.Function(this, functionName, {
    runtime: nodeRuntime,
    handler: handler,
    code: lambda.Code.fromAsset(codePath),
    environment: additionalEnvironment
  });

  // Use customIntegration if provided, otherwise default to HttpLambdaIntegration
  const integration = customIntegration ? customIntegration : new HttpLambdaIntegration(`${functionName}-integration`, createLambda);
  const baseRoute = { path: path, methods: [HttpMethod.POST], integration: integration };
  const routeObject = lambdaAuthorizer ? { ...baseRoute, authorizer: lambdaAuthorizer } : baseRoute;
  httpApi.addRoutes(routeObject);
};

With this modification, you can now pass a custom integration when calling createLambdaAndAddRoutes if needed. For most cases, you won't need to specify the integration, and it will default to using HttpLambdaIntegration with the newly created Lambda function.

When you have a route that requires a different type of integration, you can create the integration object outside this function and pass it as the customIntegration parameter. Here's how you would call it for a standard Lambda integration and for a custom integration:

// Standard Lambda integration (no customIntegration parameter needed)
createLambdaAndAddRoutes(
  'SignUpFunction', 
  'signUp.handler', 
  'lambda/authentication', 
  ENDPOINTS.api.SignUp,
  lambdaAuthorizer,
  { COGNITO_APP_CLIENT_ID: userPoolClient.userPoolClientId }
);

// Custom integration example (assuming you have a special integration object ready)
const myCustomIntegration = new SomeOtherIntegration(...); // Assuming this is created according to your needs
createLambdaAndAddRoutes(
  'CustomIntegrationFunction', 
  'custom.handler', 
  'lambda/specialPath', 
  ENDPOINTS.api.CustomPath,
  lambdaAuthorizer,
  { SOME_ENV_VAR: 'value' },
  myCustomIntegration
);

This approach provides the flexibility to use the function with different types of integrations while keeping the common case simple and straightforward.

2024 07 04 lambdaconfig interface usage and parameter passing recommendations for improved functionality - bizkite-co/handterm GitHub Wiki

By reorganizing your code to leverage the class instance for context and encapsulating related functionality within class methods, you can simplify parameter passing and enhance the maintainability of your codebase. date: 2024-07-04T10:10

Codeium Chat Conversation

1. Abstract Lambda Creation

2. Abstract API Route Creation

3. Utilize Interfaces for Configuration

4. Construct Classes for Grouped Resources

5. Encapsulate Common Patterns

General Advice

Issue with `this` Outside Class Context

Unrecognized `lambdaAuthorizer`

Proposed Solutions

Move Resource Creation Inside Classes or Functions

Pass `lambdaAuthorizer` to `SecureApiLambda`

Adjusting `SecureApiLambda` Constructor

⚠️ GitHub.com Fallback ⚠️

2024 07 04 lambdaconfig interface usage and parameter passing recommendations for improved functionality - bizkite-co/handterm GitHub Wiki

By reorganizing your code to leverage the class instance for context and encapsulating related functionality within class methods, you can simplify parameter passing and enhance the maintainability of your codebase. date: 2024-07-04T10:10

Codeium Chat Conversation

1. Abstract Lambda Creation

2. Abstract API Route Creation

3. Utilize Interfaces for Configuration

4. Construct Classes for Grouped Resources

5. Encapsulate Common Patterns

General Advice

Issue with this Outside Class Context

Unrecognized lambdaAuthorizer

Proposed Solutions

Move Resource Creation Inside Classes or Functions

Pass lambdaAuthorizer to SecureApiLambda

Adjusting SecureApiLambda Constructor

⚠️ **GitHub.com Fallback** ⚠️

Issue with `this` Outside Class Context

Unrecognized `lambdaAuthorizer`

Pass `lambdaAuthorizer` to `SecureApiLambda`

Adjusting `SecureApiLambda` Constructor

⚠️ GitHub.com Fallback ⚠️