Add extensible components API to create components which can expose A…

…PI and render endpoints

app/javascript/custom-typings.ts

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+declare var ManageIQ: any;
+declare var Rx: any;

app/javascript/extensible-components/index.ts

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+import { IExtensionComponent, IMiQApiCallback } from './lib';
+
+/**
+ * Class for easy creation of extensible component.
+ */
+export class ExtensibleComponent {
+  public unsubscribe: Function;
+  constructor(public name: string, public api: IMiQApiCallback, public render: IMiQApiCallback){}
+}
+
+/**
+ * Create new object which will hold extension components on MiQ main object.
+ */
+ManageIQ.extensionComponents = ManageIQ.extensionComponents || {};
+
+/**
+ * Subject from from Rxjs to send message that we want to register new component.
+ */
+ManageIQ.extensionComponents.source = new Rx.Subject();
+
+/**
+ * Components will be saved in items which will be set. To easy remove of components which no longer exists.
+ */
+ManageIQ.extensionComponents.items = new Set();
+
+/**
+ * Helper function to create new component.
+ * @param name string name of new component.
+ * @param api callback functions to change inner logic of component.
+ * @param render callback function to apply render functions.
+ */
+ManageIQ.extensionComponents.newComponent = function(name: string, api?: IMiQApiCallback, render?: IMiQApiCallback) {
+  const newCmp = new ExtensibleComponent(name, api, render);
+  ManageIQ.extensionComponents.source.onNext({action: 'add', payload: newCmp});
+}
+
+/**
+ * Subscribe to extensionComponents source to add new components to items object.
+ */
+ManageIQ.extensionComponents.source.subscribe((event: IExtensionComponent) => {
+  if (event.action === 'add' && event.hasOwnProperty('payload')) {
+    event.payload.unsubscribe = () => {
+      ManageIQ.extensionComponents.items.delete(event.payload);
+    }
+    ManageIQ.extensionComponents.items.add(event.payload);
+  } else {
+    throw new Error('Unsupported action with extension components.');
+  }
+});

app/javascript/extensible-components/lib.ts

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+export interface IExtensionComponent {
+  action: string;
+  payload: any;
+}
+
+export interface IMiQApiCallback {
+  [propName: string]: Function;
+}
+
+export interface IExtensibleComponent {
+  extensibleComponent: any;
+  apiCallbacks: () => IMiQApiCallback;
+  renderCallbacks: () => IMiQApiCallback;
+}
+
+export const extensionSource = ManageIQ.extensionComponents.source;
+
+export const extensionItems = ManageIQ.extensionComponents.items;
+
+/**
+ * Helper function to create new component.
+ * @param name string name of new component.
+ * @param api callback functions to change inner logic of component.
+ * @param render callback function to apply render functions.
+ */
+export function newComponent(name: string, api?: IMiQApiCallback, render?: IMiQApiCallback) {
+  ManageIQ.extensionComponents.newComponent(name, api, render);
+}

app/javascript/packs/extensible-componenets-common.js

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+require('../extensible-components');