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feat(apigatewayv2): Lambda authorizer for WebSocket API (aws#16886)
closes aws#13869 By this PR, you will be able to enable WebSocket authorizer as the below code: ```ts const integration = new LambdaWebSocketIntegration({ handler, }); const authorizer = new WebSocketLambdaAuthorizer('Authorizer', authHandler); new WebSocketApi(stack, 'WebSocketApi', { connectRouteOptions: { integration, authorizer, }, }); ``` ---- *By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,2 @@ | ||
| export * from './http'; | ||
| export * from './websocket'; |
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packages/@aws-cdk/aws-apigatewayv2-authorizers/lib/websocket/index.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1 @@ | ||
| export * from './lambda'; |
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packages/@aws-cdk/aws-apigatewayv2-authorizers/lib/websocket/lambda.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| import { | ||
| WebSocketAuthorizer, | ||
| WebSocketAuthorizerType, | ||
| WebSocketRouteAuthorizerBindOptions, | ||
| WebSocketRouteAuthorizerConfig, | ||
| IWebSocketRouteAuthorizer, | ||
| IWebSocketApi, | ||
| } from '@aws-cdk/aws-apigatewayv2'; | ||
| import { ServicePrincipal } from '@aws-cdk/aws-iam'; | ||
| import { IFunction } from '@aws-cdk/aws-lambda'; | ||
| import { Stack, Names } from '@aws-cdk/core'; | ||
|
|
||
| // keep this import separate from other imports to reduce chance for merge conflicts with v2-main | ||
| // eslint-disable-next-line no-duplicate-imports, import/order | ||
| import { Construct as CoreConstruct } from '@aws-cdk/core'; | ||
|
|
||
| /** | ||
| * Properties to initialize WebSocketTokenAuthorizer. | ||
| */ | ||
| export interface WebSocketLambdaAuthorizerProps { | ||
|
|
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| /** | ||
| * The name of the authorizer | ||
| * @default - same value as `id` passed in the constructor. | ||
| */ | ||
| readonly authorizerName?: string; | ||
|
|
||
| /** | ||
| * The identity source for which authorization is requested. | ||
| * | ||
| * @default ['$request.header.Authorization'] | ||
| */ | ||
| readonly identitySource?: string[]; | ||
| } | ||
|
|
||
| /** | ||
| * Authorize WebSocket Api routes via a lambda function | ||
| */ | ||
| export class WebSocketLambdaAuthorizer implements IWebSocketRouteAuthorizer { | ||
| private authorizer?: WebSocketAuthorizer; | ||
| private webSocketApi?: IWebSocketApi; | ||
|
|
||
| constructor( | ||
| private readonly id: string, | ||
| private readonly handler: IFunction, | ||
| private readonly props: WebSocketLambdaAuthorizerProps = {}) { | ||
| } | ||
|
|
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| public bind(options: WebSocketRouteAuthorizerBindOptions): WebSocketRouteAuthorizerConfig { | ||
| if (this.webSocketApi && (this.webSocketApi.apiId !== options.route.webSocketApi.apiId)) { | ||
| throw new Error('Cannot attach the same authorizer to multiple Apis'); | ||
| } | ||
|
|
||
| if (!this.authorizer) { | ||
| this.webSocketApi = options.route.webSocketApi; | ||
| this.authorizer = new WebSocketAuthorizer(options.scope, this.id, { | ||
| webSocketApi: options.route.webSocketApi, | ||
| identitySource: this.props.identitySource ?? [ | ||
| '$request.header.Authorization', | ||
| ], | ||
| type: WebSocketAuthorizerType.LAMBDA, | ||
| authorizerName: this.props.authorizerName ?? this.id, | ||
| authorizerUri: lambdaAuthorizerArn(this.handler), | ||
| }); | ||
|
|
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| this.handler.addPermission(`${Names.nodeUniqueId(this.authorizer.node)}-Permission`, { | ||
| scope: options.scope as CoreConstruct, | ||
| principal: new ServicePrincipal('apigateway.amazonaws.com'), | ||
| sourceArn: Stack.of(options.route).formatArn({ | ||
| service: 'execute-api', | ||
| resource: options.route.webSocketApi.apiId, | ||
| resourceName: `authorizers/${this.authorizer.authorizerId}`, | ||
| }), | ||
| }); | ||
| } | ||
|
|
||
| return { | ||
| authorizerId: this.authorizer.authorizerId, | ||
| authorizationType: 'CUSTOM', | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * constructs the authorizerURIArn. | ||
| */ | ||
| function lambdaAuthorizerArn(handler: IFunction) { | ||
| return `arn:${Stack.of(handler).partition}:apigateway:${Stack.of(handler).region}:lambda:path/2015-03-31/functions/${handler.functionArn}/invocations`; | ||
| } |
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packages/@aws-cdk/aws-apigatewayv2-authorizers/test/websocket/lambda.test.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| import { Template } from '@aws-cdk/assertions'; | ||
| import { WebSocketApi } from '@aws-cdk/aws-apigatewayv2'; | ||
| import { WebSocketLambdaIntegration } from '@aws-cdk/aws-apigatewayv2-integrations'; | ||
| import { Code, Function, Runtime } from '@aws-cdk/aws-lambda'; | ||
| import { Stack } from '@aws-cdk/core'; | ||
| import { WebSocketLambdaAuthorizer } from '../../lib'; | ||
|
|
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| describe('WebSocketLambdaAuthorizer', () => { | ||
| test('default', () => { | ||
| // GIVEN | ||
| const stack = new Stack(); | ||
|
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| const handler = new Function(stack, 'auth-function', { | ||
| runtime: Runtime.NODEJS_12_X, | ||
| code: Code.fromInline('exports.handler = () => {return true}'), | ||
| handler: 'index.handler', | ||
| }); | ||
| const integration = new WebSocketLambdaIntegration( | ||
| 'Integration', | ||
| handler, | ||
| ); | ||
|
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| const authorizer = new WebSocketLambdaAuthorizer('default-authorizer', handler); | ||
|
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| // WHEN | ||
| new WebSocketApi(stack, 'WebSocketApi', { | ||
| connectRouteOptions: { | ||
| integration, | ||
| authorizer, | ||
| }, | ||
| }); | ||
|
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| // THEN | ||
| Template.fromStack(stack).hasResourceProperties('AWS::ApiGatewayV2::Authorizer', { | ||
| Name: 'default-authorizer', | ||
| AuthorizerType: 'REQUEST', | ||
| IdentitySource: [ | ||
| '$request.header.Authorization', | ||
| ], | ||
| }); | ||
|
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| Template.fromStack(stack).hasResourceProperties('AWS::ApiGatewayV2::Route', { | ||
| AuthorizationType: 'CUSTOM', | ||
| }); | ||
| }); | ||
| }); |
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