Task 3

backend/.gitignore

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+*.js
+!jest.config.js
+*.d.ts
+node_modules
+
+# CDK asset staging directory
+.cdk.staging
+cdk.out

backend/.npmignore

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+*.ts
+!*.d.ts
+
+# CDK asset staging directory
+.cdk.staging
+cdk.out

backend/README.md

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+# Welcome to your CDK TypeScript project
+
+This is a blank project for CDK development with TypeScript.
+
+The `cdk.json` file tells the CDK Toolkit how to execute your app.
+
+## Useful commands
+
+* `npm run build`   compile typescript to js
+* `npm run bundle`  bundle lambda handlers with custom esbuild config
+* `npm run watch`   watch for changes and compile
+* `npm run test`    perform the jest unit tests
+* `npx cdk deploy`  deploy this stack to your default AWS account/region
+* `npx cdk diff`    compare deployed stack with current state
+* `npx cdk synth`   emits the synthesized CloudFormation template
+
+## Task 3 Artifacts
+
+- Swagger/OpenAPI documentation: `swagger/product-service.yaml`
+- Unit tests for handlers:
+	- `test/getProductsList.test.ts`
+	- `test/getProductsById.test.ts`
+
+### Product Service API
+
+- `GET /product/available`
+- `GET /product/{productId}`

backend/bin/backend.ts

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+#!/usr/bin/env node
+
+import * as cdk from 'aws-cdk-lib';
+
+import { ProductServiceStack }
+from '../lib/product-service-stack';
+
+const app = new cdk.App();
+
+new ProductServiceStack(
+app,
+'ProductServiceStack'
+);

backend/cdk.json

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+{
+  "app": "npx ts-node --prefer-ts-exts bin/backend.ts",
+  "watch": {
+    "include": [
+      "**"
+    ],
+    "exclude": [
+      "README.md",
+      "cdk*.json",
+      "**/*.d.ts",
+      "**/*.js",
+      "tsconfig.json",
+      "package*.json",
+      "yarn.lock",
+      "node_modules",
+      "test"
+    ]
+  },
+  "context": {
+    "@aws-cdk/aws-signer:signingProfileNamePassedToCfn": true,
+    "@aws-cdk/aws-ecs-patterns:secGroupsDisablesImplicitOpenListener": true,
+    "@aws-cdk/aws-lambda:recognizeLayerVersion": true,
+    "@aws-cdk/core:checkSecretUsage": true,
+    "@aws-cdk/core:target-partitions": [
+      "aws",
+      "aws-cn"
+    ],
+    "@aws-cdk-containers/ecs-service-extensions:enableDefaultLogDriver": true,
+    "@aws-cdk/aws-ec2:uniqueImdsv2TemplateName": true,
+    "@aws-cdk/aws-ecs:arnFormatIncludesClusterName": true,
+    "@aws-cdk/aws-iam:minimizePolicies": true,
+    "@aws-cdk/core:validateSnapshotRemovalPolicy": true,
+    "@aws-cdk/aws-codepipeline:crossAccountKeyAliasStackSafeResourceName": true,
+    "@aws-cdk/aws-s3:createDefaultLoggingPolicy": true,
+    "@aws-cdk/aws-sns-subscriptions:restrictSqsDescryption": true,
+    "@aws-cdk/aws-apigateway:disableCloudWatchRole": true,
+    "@aws-cdk/core:enablePartitionLiterals": true,
+    "@aws-cdk/aws-events:eventsTargetQueueSameAccount": true,
+    "@aws-cdk/aws-ecs:disableExplicitDeploymentControllerForCircuitBreaker": true,
+    "@aws-cdk/aws-iam:importedRoleStackSafeDefaultPolicyName": true,
+    "@aws-cdk/aws-s3:serverAccessLogsUseBucketPolicy": true,
+    "@aws-cdk/aws-route53-patters:useCertificate": true,
+    "@aws-cdk/customresources:installLatestAwsSdkDefault": false,
+    "@aws-cdk/aws-rds:databaseProxyUniqueResourceName": true,
+    "@aws-cdk/aws-codedeploy:removeAlarmsFromDeploymentGroup": true,
+    "@aws-cdk/aws-apigateway:authorizerChangeDeploymentLogicalId": true,
+    "@aws-cdk/aws-ec2:launchTemplateDefaultUserData": true,
+    "@aws-cdk/aws-secretsmanager:useAttachedSecretResourcePolicyForSecretTargetAttachments": true,
+    "@aws-cdk/aws-redshift:columnId": true,
+    "@aws-cdk/aws-stepfunctions-tasks:enableEmrServicePolicyV2": true,
+    "@aws-cdk/aws-ec2:restrictDefaultSecurityGroup": true,
+    "@aws-cdk/aws-apigateway:requestValidatorUniqueId": true,
+    "@aws-cdk/aws-kms:aliasNameRef": true,
+    "@aws-cdk/aws-kms:applyImportedAliasPermissionsToPrincipal": true,
+    "@aws-cdk/aws-autoscaling:generateLaunchTemplateInsteadOfLaunchConfig": true,
+    "@aws-cdk/core:includePrefixInUniqueNameGeneration": true,
+    "@aws-cdk/aws-efs:denyAnonymousAccess": true,
+    "@aws-cdk/aws-opensearchservice:enableOpensearchMultiAzWithStandby": true,
+    "@aws-cdk/aws-lambda-nodejs:useLatestRuntimeVersion": true,
+    "@aws-cdk/aws-efs:mountTargetOrderInsensitiveLogicalId": true,
+    "@aws-cdk/aws-rds:auroraClusterChangeScopeOfInstanceParameterGroupWithEachParameters": true,
+    "@aws-cdk/aws-appsync:useArnForSourceApiAssociationIdentifier": true,
+    "@aws-cdk/aws-rds:preventRenderingDeprecatedCredentials": true,
+    "@aws-cdk/aws-codepipeline-actions:useNewDefaultBranchForCodeCommitSource": true,
+    "@aws-cdk/aws-cloudwatch-actions:changeLambdaPermissionLogicalIdForLambdaAction": true,
+    "@aws-cdk/aws-codepipeline:crossAccountKeysDefaultValueToFalse": true,
+    "@aws-cdk/aws-codepipeline:defaultPipelineTypeToV2": true,
+    "@aws-cdk/aws-kms:reduceCrossAccountRegionPolicyScope": true,
+    "@aws-cdk/aws-eks:nodegroupNameAttribute": true,
+    "@aws-cdk/aws-eks:useNativeOidcProvider": true,
+    "@aws-cdk/aws-ec2:ebsDefaultGp3Volume": true,
+    "@aws-cdk/aws-ecs:removeDefaultDeploymentAlarm": true,
+    "@aws-cdk/custom-resources:logApiResponseDataPropertyTrueDefault": false,
+    "@aws-cdk/aws-s3:keepNotificationInImportedBucket": false,
+    "@aws-cdk/core:explicitStackTags": true,
+    "@aws-cdk/aws-ecs:reduceEc2FargateCloudWatchPermissions": true,
+    "@aws-cdk/aws-dynamodb:resourcePolicyPerReplica": true,
+    "@aws-cdk/aws-ec2:ec2SumTImeoutEnabled": true,
+    "@aws-cdk/aws-appsync:appSyncGraphQLAPIScopeLambdaPermission": true,
+    "@aws-cdk/aws-rds:setCorrectValueForDatabaseInstanceReadReplicaInstanceResourceId": true,
+    "@aws-cdk/core:cfnIncludeRejectComplexResourceUpdateCreatePolicyIntrinsics": true,
+    "@aws-cdk/aws-lambda-nodejs:sdkV3ExcludeSmithyPackages": true,
+    "@aws-cdk/aws-stepfunctions-tasks:fixRunEcsTaskPolicy": true,
+    "@aws-cdk/aws-ec2:bastionHostUseAmazonLinux2023ByDefault": true,
+    "@aws-cdk/aws-route53-targets:userPoolDomainNameMethodWithoutCustomResource": true,
+    "@aws-cdk/aws-elasticloadbalancingV2:albDualstackWithoutPublicIpv4SecurityGroupRulesDefault": true,
+    "@aws-cdk/aws-iam:oidcRejectUnauthorizedConnections": true,
+    "@aws-cdk/core:enableAdditionalMetadataCollection": true,
+    "@aws-cdk/aws-lambda:createNewPoliciesWithAddToRolePolicy": false,
+    "@aws-cdk/aws-s3:setUniqueReplicationRoleName": true,
+    "@aws-cdk/aws-events:requireEventBusPolicySid": true,
+    "@aws-cdk/core:aspectPrioritiesMutating": true,
+    "@aws-cdk/aws-dynamodb:retainTableReplica": true,
+    "@aws-cdk/aws-stepfunctions:useDistributedMapResultWriterV2": true,
+    "@aws-cdk/s3-notifications:addS3TrustKeyPolicyForSnsSubscriptions": true,
+    "@aws-cdk/aws-ec2:requirePrivateSubnetsForEgressOnlyInternetGateway": true,
+    "@aws-cdk/aws-s3:publicAccessBlockedByDefault": true,
+    "@aws-cdk/aws-lambda:useCdkManagedLogGroup": true,
+    "@aws-cdk/aws-elasticloadbalancingv2:networkLoadBalancerWithSecurityGroupByDefault": true,
+    "@aws-cdk/aws-ecs-patterns:uniqueTargetGroupId": true,
+    "@aws-cdk/aws-route53-patterns:useDistribution": true,
+    "@aws-cdk/aws-cloudfront:defaultFunctionRuntimeV2_0": true,
+    "@aws-cdk/aws-elasticloadbalancingv2:usePostQuantumTlsPolicy": true
+  }
+}

backend/jest.config.js

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+module.exports = {
+  testEnvironment: 'node',
+  roots: ['<rootDir>/test'],
+  testMatch: ['**/*.test.ts'],
+  transform: {
+    '^.+\\.tsx?$': 'ts-jest'
+  },
+  setupFilesAfterEnv: ['aws-cdk-lib/testhelpers/jest-autoclean'],
+};

backend/lambda/data/products.ts

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+export const products = [
+  {
+    id: "1",
+    title: "Laptop",
+    description: "Gaming laptop",
+    price: 1200,
+  },
+  {
+    id: "2",
+    title: "Phone",
+    description: "Smartphone",
+    price: 700,
+  },
+  {
+    id: "3",
+    title: "Headphones",
+    description: "Wireless headphones",
+    price: 200,
+  },
+];

backend/lambda/handlers/getProductsById.ts

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+import { products } from "../data/products";
+
+export const handler = async (event: any) => {
+  const corsHeaders = {
+    "Access-Control-Allow-Origin": "*",
+    "Access-Control-Allow-Headers": "Content-Type,Authorization",
+    "Access-Control-Allow-Methods": "GET,OPTIONS",
+  };
+
+  const productId = event?.pathParameters?.productId;
+
+  if (!productId) {
+    return {
+      statusCode: 400,
+      headers: corsHeaders,
+      body: JSON.stringify({
+        message: "Missing productId",
+      }),
+    };
+  }
+
+  const product = products.find((p) => p.id === productId);
+
+  if (!product) {
+    return {
+      statusCode: 404,
+      headers: corsHeaders,
+      body: JSON.stringify({
+        message: "Product not found",
+      }),
+    };
+  }
+
+  return {
+    statusCode: 200,
+    headers: corsHeaders,
+    body: JSON.stringify(product),
+  };
+};

backend/lambda/handlers/getProductsList.ts

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+import { products } from "../data/products";
+
+export const handler = async () => {
+	return {
+		statusCode: 200,
+		headers: {
+			"Access-Control-Allow-Origin": "*",
+			"Access-Control-Allow-Headers": "Content-Type,Authorization",
+			"Access-Control-Allow-Methods": "GET,OPTIONS",
+		},
+		body: JSON.stringify(products),
+	};
+};

backend/lib/product-service-stack.ts

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+import * as cdk from "aws-cdk-lib";
+import { Construct } from "constructs";
+
+import * as lambda from "aws-cdk-lib/aws-lambda";
+import * as apigateway from "aws-cdk-lib/aws-apigateway";
+
+export class ProductServiceStack extends cdk.Stack {
+  constructor(scope: Construct, id: string) {
+    super(scope, id);
+
+    const getProductsList = new lambda.Function(this, "GetProductsList", {
+      runtime: lambda.Runtime.NODEJS_20_X,
+      handler: "handlers/getProductsList.handler",
+      code: lambda.Code.fromAsset("lambda"),
+    });
+
+    const getProductsById = new lambda.Function(this, "GetProductsById", {
+      runtime: lambda.Runtime.NODEJS_20_X,
+      handler: "handlers/getProductsById.handler",
+      code: lambda.Code.fromAsset("lambda"),
+    });
+
+    const api = new apigateway.RestApi(this, "ProductsApi", {
+      defaultCorsPreflightOptions: {
+        allowOrigins: apigateway.Cors.ALL_ORIGINS,
+        allowMethods: ["GET", "OPTIONS"],
+        allowHeaders: ["Content-Type", "Authorization"],
+      },
+    });
+
+    const product = api.root.addResource("product");
+    const available = product.addResource("available");
+
+    available.addMethod(
+      "GET",
+      new apigateway.LambdaIntegration(getProductsList),
+    );
+
+    const singleProduct = product.addResource("{productId}");
+
+    singleProduct.addMethod(
+      "GET",
+      new apigateway.LambdaIntegration(getProductsById),
+    );
+
+    // Backward-compatible routes in case any client still uses /products/*.
+    const products = api.root.addResource("products");
+    products.addMethod(
+      "GET",
+      new apigateway.LambdaIntegration(getProductsList),
+    );
+    products
+      .addResource("{productId}")
+      .addMethod("GET", new apigateway.LambdaIntegration(getProductsById));
+
+    new cdk.CfnOutput(this, "ProductsApiUrl", {
+      value: api.url,
+    });
+  }
+}