featpass extension into the contructor.

* This allows someone to pass an extension/extensions into the CloudEvent contructor when creating a CloudEvent.

fixes cloudevents#209

Signed-off-by: Lucas Holmquist <lholmqui@redhat.com>

src/lib/cloudevent.ts

@@ -18,7 +18,7 @@ export type CE = CloudEventV1 | CloudEventV1Attributes | CloudEventV03 | CloudEv
 export class CloudEvent {
   spec: any;
   formatter: any;
-  extensions: {};
+  extensions: object;
 
   /**
    * Creates a new CloudEvent instance
@@ -33,6 +33,7 @@ export class CloudEvent {
    * @param {string} [event.schemaURL]  The URI of the schema that the event data adheres to (v0.3 events)
    * @param {string} [event.dataContentEncoding] The content encoding for the event data (v0.3 events)
    * @param {string} [event.specversion] The CloudEvent specification version for this event - default: 1.0
+   * @param {object} [event.extensions] The CloudEvent extensions for this event
    * @param {*} [event.data] The event payload
    */
   constructor(event: CE) {
@@ -81,7 +82,13 @@ export class CloudEvent {
       this.time = event.time;
     }
     this.formatter = new Formatter();
+
     this.extensions = {};
+    if (event.extensions) {
+        for (const key in event.extensions) {
+            this.addExtension(key, event.extensions[key]);
+        }
+    }
   }
 
   /**

test-ts/cloud_event_test.ts

@@ -119,6 +119,16 @@ describe("A 1.0 CloudEvent", () => {
     expect(Object.keys(ce.extensions).length).to.equal(0);
   });
 
+  it("can be constructed with extensions", () => {
+    const extensions = {
+      "extension-key": "extension-value"
+    };
+    const ce = new CloudEvent({
+      extensions, ...fixture
+    });
+    expect(Object.keys(ce.extensions).length).to.equal(1);
+  });
+
   it("throws ValidationError if the CloudEvent does not conform to the schema");
   it("returns a JSON string even if format is invalid");
   it("correctly formats a CloudEvent as JSON");