feat(apigatewayv2): http api - IAM authorizer support (aws#17519)

Fixes aws#15123 See also: [@nija-at's comments on `grantInvoke`](aws#14853 (comment)), aws#10534 ---- *By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
TikiTDO · Feb 21, 2022 · 0e4c58e · 0e4c58e
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diff --git a/packages/@aws-cdk/aws-apigatewayv2-authorizers/README.md b/packages/@aws-cdk/aws-apigatewayv2-authorizers/README.md
@@ -25,6 +25,7 @@
   - [JWT Authorizers](#jwt-authorizers)
     - [User Pool Authorizer](#user-pool-authorizer)
   - [Lambda Authorizers](#lambda-authorizers)
+  - [IAM Authorizers](#iam-authorizers)
 - [WebSocket APIs](#websocket-apis)
   - [Lambda Authorizer](#lambda-authorizer)
 
@@ -199,6 +200,30 @@ api.addRoutes({
 });
 ```
 
+### IAM Authorizers
+
+API Gateway supports IAM via the included `HttpIamAuthorizer` and grant syntax:
+
+```ts
+import { HttpIamAuthorizer } from '@aws-cdk/aws-apigatewayv2-authorizers';
+import { HttpUrlIntegration } from '@aws-cdk/aws-apigatewayv2-integrations';
+
+declare const principal: iam.AnyPrincipal;
+
+const authorizer = new HttpIamAuthorizer();
+
+const httpApi = new apigwv2.HttpApi(this, 'HttpApi', {
+  defaultAuthorizer: authorizer,
+});
+
+const routes = httpApi.addRoutes({
+  integration: new HttpUrlIntegration('BooksIntegration', 'https://get-books-proxy.myproxy.internal'),
+  path: '/books/{book}',
+});
+
+routes[0].grantInvoke(principal);
+```
+
 ## WebSocket APIs
 
 You can set an authorizer to your WebSocket API's `$connect` route to control access to your API.

diff --git a/packages/@aws-cdk/aws-apigatewayv2-authorizers/lib/http/iam.ts b/packages/@aws-cdk/aws-apigatewayv2-authorizers/lib/http/iam.ts
@@ -0,0 +1,17 @@
+import {
+  HttpAuthorizerType,
+  HttpRouteAuthorizerBindOptions,
+  HttpRouteAuthorizerConfig,
+  IHttpRouteAuthorizer,
+} from '@aws-cdk/aws-apigatewayv2';
+
+/**
+ * Authorize HTTP API Routes with IAM
+ */
+export class HttpIamAuthorizer implements IHttpRouteAuthorizer {
+  public bind(_options: HttpRouteAuthorizerBindOptions): HttpRouteAuthorizerConfig {
+    return {
+      authorizationType: HttpAuthorizerType.IAM,
+    };
+  }
+}
diff --git a/packages/@aws-cdk/aws-apigatewayv2-authorizers/lib/http/index.ts b/packages/@aws-cdk/aws-apigatewayv2-authorizers/lib/http/index.ts
@@ -1,3 +1,4 @@
 export * from './user-pool';
 export * from './jwt';
-export * from './lambda';
+export * from './lambda';
+export * from './iam';
diff --git a/packages/@aws-cdk/aws-apigatewayv2-authorizers/rosetta/default.ts-fixture b/packages/@aws-cdk/aws-apigatewayv2-authorizers/rosetta/default.ts-fixture
@@ -2,6 +2,7 @@
 import { Construct } from 'constructs';
 import { Duration, Stack } from '@aws-cdk/core';
 import * as apigwv2 from '@aws-cdk/aws-apigatewayv2';
+import * as iam from '@aws-cdk/aws-iam';
 import * as lambda from '@aws-cdk/aws-lambda';
 
 class Fixture extends Stack {

diff --git a/packages/@aws-cdk/aws-apigatewayv2-authorizers/test/http/integ.iam.expected.json b/packages/@aws-cdk/aws-apigatewayv2-authorizers/test/http/integ.iam.expected.json
@@ -0,0 +1,204 @@
+{
+  "Resources": {
+    "User00B015A1": {
+      "Type": "AWS::IAM::User"
+    },
+    "UserDefaultPolicy1F97781E": {
+      "Type": "AWS::IAM::Policy",
+      "Properties": {
+        "PolicyDocument": {
+          "Statement": [
+            {
+              "Action": "execute-api:Invoke",
+              "Effect": "Allow",
+              "Resource": {
+                "Fn::Join": [
+                  "",
+                  [
+                    "arn:aws:execute-api:",
+                    {
+                      "Ref": "AWS::Region"
+                    },
+                    ":",
+                    {
+                      "Ref": "AWS::AccountId"
+                    },
+                    ":",
+                    {
+                      "Ref": "HttpApiF5A9A8A7"
+                    },
+                    "/*/*/foo"
+                  ]
+                ]
+              }
+            },
+            {
+              "Action": "execute-api:Invoke",
+              "Effect": "Allow",
+              "Resource": {
+                "Fn::Join": [
+                  "",
+                  [
+                    "arn:aws:execute-api:",
+                    {
+                      "Ref": "AWS::Region"
+                    },
+                    ":",
+                    {
+                      "Ref": "AWS::AccountId"
+                    },
+                    ":",
+                    {
+                      "Ref": "HttpApiF5A9A8A7"
+                    },
+                    "/*/*/books/*"
+                  ]
+                ]
+              }
+            }
+          ],
+          "Version": "2012-10-17"
+        },
+        "PolicyName": "UserDefaultPolicy1F97781E",
+        "Users": [
+          {
+            "Ref": "User00B015A1"
+          }
+        ]
+      }
+    },
+    "UserAccess": {
+      "Type": "AWS::IAM::AccessKey",
+      "Properties": {
+        "UserName": {
+          "Ref": "User00B015A1"
+        }
+      }
+    },
+    "HttpApiF5A9A8A7": {
+      "Type": "AWS::ApiGatewayV2::Api",
+      "Properties": {
+        "Name": "HttpApi",
+        "ProtocolType": "HTTP"
+      }
+    },
+    "HttpApiDefaultStage3EEB07D6": {
+      "Type": "AWS::ApiGatewayV2::Stage",
+      "Properties": {
+        "ApiId": {
+          "Ref": "HttpApiF5A9A8A7"
+        },
+        "StageName": "$default",
+        "AutoDeploy": true
+      }
+    },
+    "HttpApiANYfooexamplecom903F7A9F": {
+      "Type": "AWS::ApiGatewayV2::Integration",
+      "Properties": {
+        "ApiId": {
+          "Ref": "HttpApiF5A9A8A7"
+        },
+        "IntegrationType": "HTTP_PROXY",
+        "IntegrationMethod": "GET",
+        "IntegrationUri": "https://www.example.com/",
+        "PayloadFormatVersion": "1.0"
+      }
+    },
+    "HttpApiANYfooD178456F": {
+      "Type": "AWS::ApiGatewayV2::Route",
+      "Properties": {
+        "ApiId": {
+          "Ref": "HttpApiF5A9A8A7"
+        },
+        "RouteKey": "ANY /foo",
+        "AuthorizationType": "AWS_IAM",
+        "Target": {
+          "Fn::Join": [
+            "",
+            [
+              "integrations/",
+              {
+                "Ref": "HttpApiANYfooexamplecom903F7A9F"
+              }
+            ]
+          ]
+        }
+      }
+    },
+    "HttpApiANYbooksbookexamplecom5C333C98": {
+      "Type": "AWS::ApiGatewayV2::Integration",
+      "Properties": {
+        "ApiId": {
+          "Ref": "HttpApiF5A9A8A7"
+        },
+        "IntegrationType": "HTTP_PROXY",
+        "IntegrationMethod": "GET",
+        "IntegrationUri": "https://www.example.com/",
+        "PayloadFormatVersion": "1.0"
+      }
+    },
+    "HttpApiANYbooksbook2F78361C": {
+      "Type": "AWS::ApiGatewayV2::Route",
+      "Properties": {
+        "ApiId": {
+          "Ref": "HttpApiF5A9A8A7"
+        },
+        "RouteKey": "ANY /books/{book}",
+        "AuthorizationType": "AWS_IAM",
+        "Target": {
+          "Fn::Join": [
+            "",
+            [
+              "integrations/",
+              {
+                "Ref": "HttpApiANYbooksbookexamplecom5C333C98"
+              }
+            ]
+          ]
+        }
+      }
+    }
+  },
+  "Outputs": {
+    "API": {
+      "Value": {
+        "Fn::Join": [
+          "",
+          [
+            "https://",
+            {
+              "Ref": "HttpApiF5A9A8A7"
+            },
+            ".execute-api.",
+            {
+              "Ref": "AWS::Region"
+            },
+            ".",
+            {
+              "Ref": "AWS::URLSuffix"
+            },
+            "/"
+          ]
+        ]
+      }
+    },
+    "TESTACCESSKEYID": {
+      "Value": {
+        "Ref": "UserAccess"
+      }
+    },
+    "TESTSECRETACCESSKEY": {
+      "Value": {
+        "Fn::GetAtt": [
+          "UserAccess",
+          "SecretAccessKey"
+        ]
+      }
+    },
+    "TESTREGION": {
+      "Value": {
+        "Ref": "AWS::Region"
+      }
+    }
+  }
+}
diff --git a/packages/@aws-cdk/aws-apigatewayv2-authorizers/test/http/integ.iam.ts b/packages/@aws-cdk/aws-apigatewayv2-authorizers/test/http/integ.iam.ts
@@ -0,0 +1,69 @@
+import * as apigatewayv2 from '@aws-cdk/aws-apigatewayv2';
+import * as iam from '@aws-cdk/aws-iam';
+import * as cdk from '@aws-cdk/core';
+import { HttpIamAuthorizer } from '../../lib';
+
+class ExampleComIntegration extends apigatewayv2.HttpRouteIntegration {
+  public bind(): apigatewayv2.HttpRouteIntegrationConfig {
+    return {
+      type: apigatewayv2.HttpIntegrationType.HTTP_PROXY,
+      payloadFormatVersion: apigatewayv2.PayloadFormatVersion.VERSION_1_0,
+      method: apigatewayv2.HttpMethod.GET,
+      uri: 'https://www.example.com/',
+    };
+  }
+}
+
+const app = new cdk.App();
+const stack = new cdk.Stack(app, 'IntegApiGatewayV2Iam');
+const user = new iam.User(stack, 'User');
+const userAccessKey = new iam.CfnAccessKey(stack, 'UserAccess', {
+  userName: user.userName,
+});
+
+const httpApi = new apigatewayv2.HttpApi(stack, 'HttpApi', {
+  defaultAuthorizer: new HttpIamAuthorizer(),
+});
+
+const [fooRoute] = httpApi.addRoutes({
+  integration: new ExampleComIntegration('examplecom'),
+  path: '/foo',
+});
+
+fooRoute.grantInvoke(user);
+
+const [booksRoute] = httpApi.addRoutes({
+  integration: new ExampleComIntegration('examplecom'),
+  path: '/books/{book}',
+});
+
+booksRoute.grantInvoke(user);
+
+new cdk.CfnOutput(stack, 'API', {
+  value: httpApi.url!,
+});
+
+new cdk.CfnOutput(stack, 'TESTACCESSKEYID', {
+  value: userAccessKey.ref,
+});
+
+new cdk.CfnOutput(stack, 'TESTSECRETACCESSKEY', {
+  value: userAccessKey.attrSecretAccessKey,
+});
+
+new cdk.CfnOutput(stack, 'TESTREGION', {
+  value: stack.region,
+});
+
+/*
+ * Stack verification steps:
+ * * Get cURL version 7.75.0 or later so you can use the --aws-sigv4 option
+ * * Curl <url>/foo without sigv4 and expect a 403
+ * * Curl <url>/books/something without sigv4 and expect a 403
+ * * Curl <url>/foo with sigv4 from the authorized user and expect 200
+ * * Curl <url>/books/something with sigv4 from the authorized user and expect 200
+ *
+ * Reference:
+ * * Using cURL 7.75.0 or later via the official docker image: docker run --rm curlimages/curl -s -o/dev/null -w"%{http_code}" <url>
+ * * Args to enable sigv4 with authorized credentials: --user "$TESTACCESSKEYID:$TESTSECRETACCESSKEY" --aws-sigv4 "aws:amz:$TESTREGION:execute-api"
+ */
diff --git a/packages/@aws-cdk/aws-apigatewayv2/lib/http/authorizer.ts b/packages/@aws-cdk/aws-apigatewayv2/lib/http/authorizer.ts
@@ -10,6 +10,9 @@ import { IHttpRoute } from './route';
  * Supported Authorizer types
  */
 export enum HttpAuthorizerType {
+  /** IAM Authorizer */
+  IAM = 'AWS_IAM',
+
   /** JSON Web Tokens */
   JWT = 'JWT',
 
@@ -221,6 +224,7 @@ export interface HttpRouteAuthorizerConfig {
    * The type of authorization
    *
    * Possible values are:
+   * - AWS_IAM - IAM Authorizer
    * - JWT - JSON Web Token Authorizer
    * - CUSTOM - Lambda Authorizer
    * - NONE - No Authorization

diff --git a/packages/@aws-cdk/aws-apigatewayv2/lib/http/index.ts b/packages/@aws-cdk/aws-apigatewayv2/lib/http/index.ts
@@ -3,4 +3,4 @@ export * from './route';
 export * from './integration';
 export * from './stage';
 export * from './vpc-link';
-export * from './authorizer';
+export * from './authorizer';