fix(events): detailType doesnt allow filtering patterns

packages/@aws-cdk-testing/framework-integ/test/aws-events/test/integ.rule.js.snapshot/RuleStack.template.json

@@ -121,7 +121,10 @@
       ]
      },
      "detail-type": [
-      "detailType1"
+      "detailType1",
+      {
+       "prefix": "detailPrefix"
+      }
      ],
      "id": [
       "id1",

packages/@aws-cdk-testing/framework-integ/test/aws-events/test/integ.rule.ts

@@ -31,7 +31,7 @@ new Rule(stack, 'MyRule', {
       suffix: Match.suffix('.com'),
       equalsIgnoreCase: Match.equalsIgnoreCase('ignore case'),
     },
-    detailType: ['detailType1'],
+    detailType: ['detailType1', { prefix: 'detailPrefix' }],
     id: ['id1', 'id2'],
     region: ['region1', 'region2', 'region3'],
     resources: ['r1'],

packages/aws-cdk-lib/aws-events/lib/event-pattern.ts

@@ -285,13 +285,15 @@ export interface EventPattern {
 
   /**
    * Identifies, in combination with the source field, the fields and values
-   * that appear in the detail field.
+   * that appear in the detail field. Can be a list of strings or JSON event
+   * filtering patterns.
    *
    * Represents the "detail-type" event field.
    *
+   * @see https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-event-patterns-content-based-filtering.html
    * @default - No filtering on detail type
    */
-  readonly detailType?: string[];
+  readonly detailType?: (string|{ [key: string]: any })[];
 
   /**
    * Identifies the service that sourced the event. All events sourced from

packages/aws-cdk-lib/aws-events/test/rule.test.ts

@@ -196,6 +196,30 @@ describe('rule', () => {
     });
   });
 
+  test('eventPattern detailType supports filtering patterns as inputs', () => {
+    const stack = new cdk.Stack();
+
+    new Rule(stack, 'MyRule', {
+      eventPattern: {
+        detailType: [{ 'prefix': 'detailType1' }, 'anotherDetailType', { 'anything-but': 'initializing' }],
+      },
+    });
+
+    Template.fromStack(stack).templateMatches({
+      'Resources': {
+        'MyRuleA44AB831': {
+          'Type': 'AWS::Events::Rule',
+          'Properties': {
+            'EventPattern': {
+              'detail-type': [{ 'prefix': 'detailType1' }, 'anotherDetailType', { 'anything-but': 'initializing' }],
+            },
+            'State': 'ENABLED',
+          },
+        },
+      },
+    });
+  });
+
   test('fails synthesis if neither eventPattern nor scheduleExpression are specified', () => {
     const app = new cdk.App();
     const stack = new cdk.Stack(app, 'MyStack');
@@ -317,6 +341,37 @@ describe('rule', () => {
     });
   });
 
+  test('addEventPattern can support event matching patterns in detailType', () => {
+    const stack = new cdk.Stack();
+
+    const rule = new Rule(stack, 'MyRule');
+    rule.addEventPattern({
+      detailType: [{ 'prefix': 'event_prefix' }],
+    });
+
+    rule.addEventPattern({
+      detailType: ['EC2 Instance State-change Notification', 'AWS API Call via CloudTrail'],
+    });
+
+    Template.fromStack(stack).templateMatches({
+      'Resources': {
+        'MyRuleA44AB831': {
+          'Type': 'AWS::Events::Rule',
+          'Properties': {
+            'EventPattern': {
+              'detail-type': [{
+                'prefix': 'event_prefix',
+              },
+              'EC2 Instance State-change Notification',
+              'AWS API Call via CloudTrail'],
+            },
+            'State': 'ENABLED',
+          },
+        },
+      },
+    });
+  });
+
   test('targets can be added via props or addTarget with input transformer', () => {
     const stack = new cdk.Stack();
     const t1: IRuleTarget = {