feat(events-targets): allow specifying event for codebuild project target (#3637)

* feat(events-targets): Add event prop

* Update codebuild.ts

* feat(events-targets): Add unit test

* Revert "feat(events-targets): Add unit test"

This reverts commit e7dbd2e.

* feat(events-targets): Add unit test

Author: hupe1980

packages/@aws-cdk/aws-events-targets/lib/codebuild.ts

@@ -3,12 +3,28 @@ import events = require('@aws-cdk/aws-events');
 import iam = require('@aws-cdk/aws-iam');
 import { singletonEventRole } from './util';
 
+/**
+ * Customize the CodeBuild Event Target
+ */
+export interface CodeBuildProjectProps {
+  /**
+   * The event to send to CodeBuild
+   *
+   * This will be the payload for the StartBuild API.
+   *
+   * @default - the entire CloudWatch event
+   */
+  readonly event?: events.RuleTargetInput;
+}
+
 /**
  * Start a CodeBuild build when an AWS CloudWatch events rule is triggered.
  */
 export class CodeBuildProject implements events.IRuleTarget {
-  constructor(private readonly project: codebuild.IProject) {
-  }
+  constructor(
+    private readonly project: codebuild.IProject,
+    private readonly props: CodeBuildProjectProps = {}
+  ) {}
 
   /**
    * Allows using build projects as event rule targets.
@@ -17,11 +33,14 @@ export class CodeBuildProject implements events.IRuleTarget {
     return {
       id: '',
       arn: this.project.projectArn,
-      role: singletonEventRole(this.project, [new iam.PolicyStatement({
-        actions: ['codebuild:StartBuild'],
-        resources: [this.project.projectArn],
-      })]),
-      targetResource: this.project,
+      role: singletonEventRole(this.project, [
+        new iam.PolicyStatement({
+          actions: ['codebuild:StartBuild'],
+          resources: [this.project.projectArn]
+        })
+      ]),
+      input: this.props.event,
+      targetResource: this.project
     };
   }
 }

packages/@aws-cdk/aws-events-targets/test/codebuild/codebuild.test.ts

@@ -67,3 +67,39 @@ test('use codebuild project as an eventrule target', () => {
     }
   }));
 });
+
+test('specifying event for codebuild project target', () => {
+  // GIVEN
+  const stack = new Stack();
+  const project = new codebuild.PipelineProject(stack, 'MyProject');
+  const rule = new events.Rule(stack, 'Rule', {
+    schedule: events.Schedule.expression('rate(1 hour)')
+  });
+
+  // WHEN
+  const eventInput = {
+    buildspecOverride: 'buildspecs/hourly.yml'
+  };
+
+  rule.addTarget(
+    new targets.CodeBuildProject(project, {
+      event: events.RuleTargetInput.fromObject(eventInput)
+    })
+  );
+
+  // THEN
+  expect(stack).to(haveResource('AWS::Events::Rule', {
+    Targets: [
+      {
+        Arn: {
+          'Fn::GetAtt': ['MyProject39F7B0AE', 'Arn']
+        },
+        Id: 'Target0',
+        Input: JSON.stringify(eventInput),
+        RoleArn: {
+          'Fn::GetAtt': ['MyProjectEventsRole5B7D93F5', 'Arn']
+        }
+      }
+    ]
+  }));
+});