fix(apigateway): allow multiple api keys to the same usage plan

packages/@aws-cdk/aws-apigateway/lib/restapi.ts

@@ -294,7 +294,7 @@ export class RestApi extends Resource implements IRestApi {
   /**
    * Adds a usage plan.
    */
-  public addUsagePlan(id: string, props: UsagePlanProps): UsagePlan {
+  public addUsagePlan(id: string, props: UsagePlanProps = {}): UsagePlan {
     return new UsagePlan(this, id, props);
   }
 

packages/@aws-cdk/aws-apigateway/lib/usage-plan.ts

@@ -178,7 +178,9 @@ export class UsagePlan extends Resource {
    * @param apiKey
    */
   public addApiKey(apiKey: IApiKey): void {
-    new CfnUsagePlanKey(this, 'UsagePlanKeyResource', {
+    const prefix = 'UsagePlanKeyResource';
+    const id = this.node.tryFindChild(prefix) ? `${prefix}:${apiKey.node.id}` : prefix;
+    new CfnUsagePlanKey(this, id, {
       keyId: apiKey.keyId,
       keyType: UsagePlanKeyType.API_KEY,
       usagePlanId: this.usagePlanId

packages/@aws-cdk/aws-apigateway/test/integ.usage-plan.multikey.expected.json

@@ -0,0 +1,44 @@
+{
+  "Resources": {
+    "myusageplan4B391740": {
+      "Type": "AWS::ApiGateway::UsagePlan",
+      "Properties": {}
+    },
+    "myusageplanUsagePlanKeyResource095B4EA9": {
+      "Type": "AWS::ApiGateway::UsagePlanKey",
+      "Properties": {
+        "KeyId": {
+          "Ref": "myapikey18B056ACE"
+        },
+        "KeyType": "API_KEY",
+        "UsagePlanId": {
+          "Ref": "myusageplan4B391740"
+        }
+      }
+    },
+    "myusageplanUsagePlanKeyResourcemyapikey25756C43A": {
+      "Type": "AWS::ApiGateway::UsagePlanKey",
+      "Properties": {
+        "KeyId": {
+          "Ref": "myapikey250C8F11B"
+        },
+        "KeyType": "API_KEY",
+        "UsagePlanId": {
+          "Ref": "myusageplan4B391740"
+        }
+      }
+    },
+    "myapikey18B056ACE": {
+      "Type": "AWS::ApiGateway::ApiKey",
+      "Properties": {
+        "Enabled": true
+      }
+    },
+    "myapikey250C8F11B": {
+      "Type": "AWS::ApiGateway::ApiKey",
+      "Properties": {
+        "Enabled": true
+      }
+    }
+  }
+}

packages/@aws-cdk/aws-apigateway/test/integ.usage-plan.multikey.ts

@@ -0,0 +1,20 @@
+import cdk = require('@aws-cdk/core');
+import apigateway = require('../lib');
+
+class Test extends cdk.Stack {
+  constructor(scope: cdk.App, id: string) {
+    super(scope, id);
+
+    const usageplan = new apigateway.UsagePlan(this, 'myusageplan');
+    const apikey1 = new apigateway.ApiKey(this, 'myapikey1');
+    const apikey2 = new apigateway.ApiKey(this, 'myapikey2');
+    usageplan.addApiKey(apikey1);
+    usageplan.addApiKey(apikey2);
+  }
+}
+
+const app = new cdk.App();
+
+new Test(app, 'test-apigateway-usageplan-multikey');
+
+app.synth();

packages/@aws-cdk/aws-apigateway/test/test.usage-plan.ts

@@ -129,5 +129,41 @@ export = {
     }, ResourcePart.Properties));
 
     test.done();
-  }
+  },
+
+  'UsagePlan can have multiple keys'(test: Test) {
+    // GIVEN
+    const stack = new cdk.Stack();
+    const usagePlan = new apigateway.UsagePlan(stack, 'my-usage-plan');
+    const apiKey1 = new apigateway.ApiKey(stack, 'my-api-key-1', {
+      apiKeyName: 'my-api-key-1'
+    });
+    const apiKey2 = new apigateway.ApiKey(stack, 'my-api-key-2', {
+      apiKeyName: 'my-api-key-2'
+    });
+
+    // WHEN
+    usagePlan.addApiKey(apiKey1);
+    usagePlan.addApiKey(apiKey2);
+
+    // THEN
+    expect(stack).to(haveResource('AWS::ApiGateway::ApiKey', {
+      Name: 'my-api-key-1'
+    }, ResourcePart.Properties));
+    expect(stack).to(haveResource('AWS::ApiGateway::ApiKey', {
+      Name: 'my-api-key-2'
+    }, ResourcePart.Properties));
+    expect(stack).to(haveResource('AWS::ApiGateway::UsagePlanKey', {
+      KeyId: {
+        Ref: 'myapikey11F723FC7'
+      }
+    }, ResourcePart.Properties));
+    expect(stack).to(haveResource('AWS::ApiGateway::UsagePlanKey', {
+      KeyId: {
+        Ref: 'myapikey2ABDEF012'
+      }
+    }, ResourcePart.Properties));
+
+    test.done();
+  },
 };