1 files changed, 95 insertions, 0 deletions
diff --git a/catalog-ui/src/app/models/base-pubsub.ts b/catalog-ui/src/app/models/base-pubsub.ts
new file mode 100644
index 0000000000..ca500ca173
--- /dev/null
+++ b/catalog-ui/src/app/models/base-pubsub.ts
@@ -0,0 +1,95 @@
+declare const window: Window;
+
+export class BasePubSub {
+
+    subscribers: Map<string, ISubscriber>;
+    eventsCallbacks: Array<Function>;
+    clientId: string;
+
+    constructor(pluginId: string) {
+        this.subscribers = new Map<string, ISubscriber>();
+        this.eventsCallbacks = new Array<Function>();
+        this.clientId = pluginId;
+        this.onMessage = this.onMessage.bind(this);
+
+        window.addEventListener("message", this.onMessage);
+    }
+
+    public register(subscriberId: string, subscriberWindow: Window, subscriberUrl: string) {
+        const subscriber = {
+            window: subscriberWindow,
+            locationUrl: subscriberUrl || subscriberWindow.location.href
+        } as ISubscriber;
+
+        this.subscribers.set(subscriberId, subscriber);
+    }
+
+    public unregister(subscriberId: string) {
+        this.subscribers.delete(subscriberId);
+    }
+
+    public on(callback: Function) {
+        this.eventsCallbacks.push(callback);
+    }
+
+    public off(callback: Function) {
+        let index = this.eventsCallbacks.indexOf(callback);
+        this.eventsCallbacks.splice(index, 1)
+    }
+
+    public notify(eventType:string, eventData:any) {
+        let eventObj = {
+            type: eventType,
+            data: eventData,
+            originId: this.clientId
+        } as IPubSubEvent;
+
+        this.subscribers.forEach( (subscriber: ISubscriber, id: string) => {
+            subscriber.window.postMessage(eventObj, subscriber.locationUrl)
+        });
+    }
+
+    protected onMessage(event: any) {
+        if (this.subscribers.has(event.data.originId)) {
+            this.eventsCallbacks.forEach((callback: Function) => {
+                callback(event.data, event);
+            })
+        }
+    }
+}
+
+export class PluginPubSub extends BasePubSub {
+
+    constructor(pluginId: string, subscriberUrl: string) {
+        super(pluginId);
+        this.register('sdc-hub', window.parent, subscriberUrl);
+        this.subscribe();
+    }
+
+    public subscribe() {
+        const registerData = {
+            pluginId: this.clientId
+        };
+
+        this.notify('PLUGIN_REGISTER', registerData);
+    }
+
+    public unsubscribe() {
+        const unregisterData = {
+            pluginId: this.clientId
+        };
+
+        this.notify('PLUGIN_UNREGISTER', unregisterData);
+    }
+}
+
+export interface IPubSubEvent {
+    type: string;
+    originId: string;
+    data: any;
+}
+
+export interface ISubscriber {
+    window: Window;
+    locationUrl: string;
+}