feat(aio): enable data driven homepage announcements

aio/content/marketing/announcements.json

@@ -0,0 +1,9 @@
+[
+  {
+    "startDate": "2018-01-01",
+    "endDate": "2018-02-02",
+    "message": "Join us in Atlanta for ngATL<br/>Jan 30 - Feb 2, 2018",
+    "imageUrl": "generated/images/marketing/home/ng-atl.png",
+    "linkUrl": "http://ng-atl.org/"
+  }
+]

aio/content/marketing/index.html

@@ -29,6 +29,8 @@ <h1 class="no-anchor no-toc" style="display: none"></h1>
 
   <div class="home-rows">
 
+    <aio-announcement-bar></aio-announcement-bar>
+
     <!-- Group 1 -->
     <div layout="row" layout-xs="column" class="home-row homepage-container">
       <div class="promo-img-container promo-1">

aio/src/app/app.module.spec.ts

@@ -23,14 +23,16 @@ describe('AppModule', () => {
   });
 
   it('should provide a list of eagerly-loaded embedded components', () => {
-    const eagerSelector = Object.keys(componentsMap).find(selector => Array.isArray(componentsMap[selector]))!;
-    const selectorCount = eagerSelector.split(',').length;
 
-    expect(eagerSelector).not.toBeNull();
-    expect(selectorCount).toBe(componentsMap[eagerSelector].length);
+    const eagerConfig = Object.keys(componentsMap).filter(selector => Array.isArray(componentsMap[selector]));
+    expect(eagerConfig.length).toBeGreaterThan(0);
+
+    const eagerSelectors = eagerConfig.reduce<string[]>((selectors, config) => selectors.concat(config.split(',')), []);
+    expect(eagerSelectors.length).toBeGreaterThan(0);
 
     // For example...
-    expect(eagerSelector).toContain('aio-toc');
+    expect(eagerSelectors).toContain('aio-toc');
+    expect(eagerSelectors).toContain('aio-announcement-bar');
   });
 
   it('should provide a list of lazy-loaded embedded components', () => {

aio/src/app/app.module.ts

@@ -14,6 +14,7 @@ import { MatToolbarModule } from '@angular/material/toolbar';
 import { ROUTES } from '@angular/router';
 
 
+import { AnnouncementBarComponent } from 'app/embedded/announcement-bar/announcement-bar.component';
 import { AppComponent } from 'app/app.component';
 import { EMBEDDED_COMPONENTS, EmbeddedComponentsMap } from 'app/embed-components/embed-components.service';
 import { CustomIconRegistry, SVG_ICONS } from 'app/shared/custom-icon-registry';
@@ -110,6 +111,7 @@ export const svgIconProviders = [
     SharedModule
   ],
   declarations: [
+    AnnouncementBarComponent,
     AppComponent,
     DocViewerComponent,
     DtComponent,
@@ -145,6 +147,7 @@ export const svgIconProviders = [
       provide: EMBEDDED_COMPONENTS,
       useValue: {
         /* tslint:disable: max-line-length */
+        'aio-announcement-bar': [AnnouncementBarComponent],
         'aio-toc': [TocComponent],
         'aio-api-list, aio-contributor-list, aio-file-not-found-search, aio-resource-list, code-example, code-tabs, current-location, live-example': embeddedModulePath,
         /* tslint:enable: max-line-length */
@@ -158,7 +161,7 @@ export const svgIconProviders = [
       multi: true,
     },
   ],
-  entryComponents: [ TocComponent ],
+  entryComponents: [ AnnouncementBarComponent, TocComponent ],
   bootstrap: [ AppComponent ]
 })
 export class AppModule {

aio/src/app/embedded/announcement-bar/announcement-bar.component.spec.ts

@@ -0,0 +1,109 @@
+import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+import { Logger } from 'app/shared/logger.service';
+import { MockLogger } from 'testing/logger.service';
+import { AnnouncementBarComponent } from './announcement-bar.component';
+
+const today = new Date();
+const lastWeek = changeDays(today, -7);
+const yesterday = changeDays(today, -1);
+const tomorrow = changeDays(today, 1);
+const nextWeek = changeDays(today, 7);
+
+describe('AnnouncementBarComponent', () => {
+
+  let element: HTMLElement;
+  let fixture: ComponentFixture<AnnouncementBarComponent>;
+  let component: AnnouncementBarComponent;
+  let httpMock: HttpTestingController;
+  let mockLogger: MockLogger;
+
+  beforeEach(() => {
+    const injector = TestBed.configureTestingModule({
+      imports: [HttpClientTestingModule],
+      declarations: [AnnouncementBarComponent],
+      providers: [{ provide: Logger, useClass: MockLogger }]
+    });
+
+    httpMock = injector.get(HttpTestingController);
+    mockLogger = injector.get(Logger);
+    fixture = TestBed.createComponent(AnnouncementBarComponent);
+    component = fixture.componentInstance;
+    element = fixture.nativeElement;
+  });
+
+  it('should have no announcement when first created', () => {
+    expect(component.announcement).toBeUndefined();
+  });
+
+  describe('ngOnInit', () => {
+    it('should make a single request to the server', () => {
+      component.ngOnInit();
+      httpMock.expectOne('generated/announcements.json');
+    });
+
+    it('should set the announcement to the first "live" one in the list loaded from `announcements.json`', () => {
+      component.ngOnInit();
+      const request = httpMock.expectOne('generated/announcements.json');
+      request.flush([
+        { startDate: lastWeek, endDate: yesterday, message: 'Test Announcement 0' },
+        { startDate: tomorrow, endDate: nextWeek, message: 'Test Announcement 1' },
+        { startDate: yesterday, endDate: tomorrow, message: 'Test Announcement 2' },
+        { startDate: yesterday, endDate: tomorrow, message: 'Test Announcement 3' }
+      ]);
+      expect(component.announcement.message).toEqual('Test Announcement 2');
+    });
+
+    it('should set the announcement to `undefined` if there are no announcements in `announcements.json`', () => {
+      component.ngOnInit();
+      const request = httpMock.expectOne('generated/announcements.json');
+      request.flush([]);
+      expect(component.announcement).toBeUndefined();
+    });
+
+    it('should handle invalid data in `announcements.json`', () => {
+      component.ngOnInit();
+      const request = httpMock.expectOne('generated/announcements.json');
+      request.flush('some random response');
+      expect(component.announcement).toBeUndefined();
+      expect(mockLogger.output.error[0][0]).toContain('generated/announcements.json contains invalid data:');
+    });
+
+    it('should handle a failed request for `announcements.json`', () => {
+      component.ngOnInit();
+      const request = httpMock.expectOne('generated/announcements.json');
+      request.error(new ErrorEvent('404'));
+      expect(component.announcement).toBeUndefined();
+      expect(mockLogger.output.error[0][0]).toContain('generated/announcements.json request failed:');
+    });
+  });
+
+  describe('rendering', () => {
+    beforeEach(() => {
+      component.announcement = {
+        imageUrl: 'link/to/image',
+        linkUrl: 'link/to/website',
+        message: 'this is an <b>important</b> message',
+        endDate: '2018-03-01',
+        startDate: '2018-02-01'
+      };
+      fixture.detectChanges();
+    });
+
+    it('should display the message as HTML', () => {
+      expect(element.innerHTML).toContain('this is an <b>important</b> message');
+    });
+
+    it('should display an image', () => {
+      expect(element.querySelector('img')!.src).toContain('link/to/image');
+    });
+
+    it('should display a link', () => {
+      expect(element.querySelector('a')!.href).toContain('link/to/website');
+    });
+  });
+});
+
+function changeDays(initial: Date, days: number) {
+  return (new Date(initial.valueOf()).setDate(initial.getDate() + days));
+}

aio/src/app/embedded/announcement-bar/announcement-bar.component.ts

@@ -0,0 +1,82 @@
+import { Component, OnInit } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Logger } from 'app/shared/logger.service';
+import { CONTENT_URL_PREFIX } from 'app/documents/document.service';
+const announcementsPath = CONTENT_URL_PREFIX + 'announcements.json';
+
+export interface Announcement {
+  imageUrl: string;
+  message: string;
+  linkUrl: string;
+  startDate: string;
+  endDate: string;
+}
+
+/**
+ * Display the latest live announcement. This is used on the homepage.
+ *
+ * The data for the announcements is kept in `aio/content/marketing/announcements.json`.
+ *
+ * The format for that data file looks like:
+ *
+ * ```
+ * [
+ *   {
+ *     "startDate": "2018-02-01",
+ *     "endDate": "2018-03-01",
+ *     "message": "This is an <b>important</b> announcement",
+ *     "imageUrl": "url/to/image",
+ *     "linkUrl": "url/to/website"
+ *   },
+ *   ...
+ * ]
+ * ```
+ *
+ * Only one announcement will be shown at any time. This is determined as the first "live"
+ * announcement in the file, where "live" means that its start date is before today, and its
+ * end date is after today.
+ *
+ * **Security Note:**
+ * The `message` field can contain unsanitized HTML but this field should only updated by
+ * verified members of the Angular team.
+ */
+@Component({
+  selector: 'aio-announcement-bar',
+  template: `
+  <div class="homepage-container" *ngIf="announcement">
+    <div class="announcement-bar">
+      <img [src]="announcement.imageUrl">
+      <p [innerHTML]="announcement.message"></p>
+      <a class="button" [href]="announcement.linkUrl">Learn More</a>
+    </div>
+  </div>`
+})
+export class AnnouncementBarComponent implements OnInit {
+  announcement: Announcement;
+
+  constructor(private http: HttpClient, private logger: Logger) {}
+
+  ngOnInit() {
+    this.http.get<Announcement[]>(announcementsPath)
+      .catch(error => {
+        this.logger.error(`${announcementsPath} request failed: ${error.message}`);
+        return [];
+      })
+      .map(announcements => this.findCurrentAnnouncement(announcements))
+      .catch(error => {
+        this.logger.error(`${announcementsPath} contains invalid data: ${error.message}`);
+        return [];
+      })
+      .subscribe(announcement => this.announcement = announcement);
+  }
+
+  /**
+   * Get the first date in the list that is "live" now
+   */
+  private findCurrentAnnouncement(announcements: Announcement[]) {
+    return announcements
+      .filter(announcement => new Date(announcement.startDate).valueOf() < Date.now())
+      .filter(announcement => new Date(announcement.endDate).valueOf() > Date.now())
+      [0];
+  }
+}

aio/tools/transforms/angular-content-package/index.js

@@ -67,6 +67,11 @@ module.exports = new Package('angular-content', [basePackage, contentPackage])
         include: CONTENTS_PATH + '/navigation.json',
         fileReader: 'jsonFileReader'
       },
+      {
+        basePath: CONTENTS_PATH,
+        include: CONTENTS_PATH + '/marketing/announcements.json',
+        fileReader: 'jsonFileReader'
+      },
       {
         basePath: CONTENTS_PATH,
         include: CONTENTS_PATH + '/marketing/contributors.json',
@@ -104,6 +109,7 @@ module.exports = new Package('angular-content', [basePackage, contentPackage])
       },
       {docTypes: ['navigation-json'], pathTemplate: '${id}', outputPathTemplate: '../${id}.json'},
       {docTypes: ['contributors-json'], pathTemplate: '${id}', outputPathTemplate: '../${id}.json'},
+      {docTypes: ['announcements-json'], pathTemplate: '${id}', outputPathTemplate: '../${id}.json'},
       {docTypes: ['resources-json'], pathTemplate: '${id}', outputPathTemplate: '../${id}.json'}
     ]);
   })