Instance homepage support (#4007)

* Prepare homepage parsers

* Add ability to update instance hompage

* Add ability to set homepage as landing page

* Add homepage preview in admin

* Dynamically update left menu for homepage

* Inject home content in homepage

* Add videos list and channel miniature custom markup

* Remove unused elements in markup service

3 files changed, 43 insertions, 1 deletions

diff --git a/client/src/app/shared/shared-main/custom-page/custom-page.service.ts b/client/src/app/shared/shared-main/custom-page/custom-page.service.ts
new file mode 100644
index 000000000..e5c2b3cd4
--- /dev/null
+++ b/client/src/app/shared/shared-main/custom-page/custom-page.service.ts
@@ -0,0 +1,38 @@
+import { of } from 'rxjs'
+import { catchError, map } from 'rxjs/operators'
+import { HttpClient } from '@angular/common/http'
+import { Injectable } from '@angular/core'
+import { RestExtractor } from '@app/core'
+import { CustomPage } from '@shared/models'
+import { environment } from '../../../../environments/environment'
+
+@Injectable()
+export class CustomPageService {
+  static BASE_INSTANCE_HOMEPAGE_URL = environment.apiUrl + '/api/v1/custom-pages/homepage/instance'
+
+  constructor (
+    private authHttp: HttpClient,
+    private restExtractor: RestExtractor
+  ) { }
+
+  getInstanceHomepage () {
+    return this.authHttp.get<CustomPage>(CustomPageService.BASE_INSTANCE_HOMEPAGE_URL)
+                        .pipe(
+                          catchError(err => {
+                            if (err.status === 404) {
+                              return of({ content: '' })
+                            }
+
+                            this.restExtractor.handleError(err)
+                          })
+                        )
+  }
+
+  updateInstanceHomepage (content: string) {
+    return this.authHttp.put(CustomPageService.BASE_INSTANCE_HOMEPAGE_URL, { content })
+      .pipe(
+        map(this.restExtractor.extractDataBool),
+        catchError(err => this.restExtractor.handleError(err))
+      )
+  }
+}
diff --git a/client/src/app/shared/shared-main/custom-page/index.ts b/client/src/app/shared/shared-main/custom-page/index.ts
new file mode 100644
index 000000000..7269ece95
--- /dev/null
+++ b/client/src/app/shared/shared-main/custom-page/index.ts
@@ -0,0 +1 @@
+export * from './custom-page.service'
diff --git a/client/src/app/shared/shared-main/shared-main.module.ts b/client/src/app/shared/shared-main/shared-main.module.ts
index 772198cb2..f9b6085cf 100644
--- a/client/src/app/shared/shared-main/shared-main.module.ts
+++ b/client/src/app/shared/shared-main/shared-main.module.ts
@@ -29,6 +29,7 @@ import {
 } from './angular'
 import { AUTH_INTERCEPTOR_PROVIDER } from './auth'
 import { ActionDropdownComponent, ButtonComponent, DeleteButtonComponent, EditButtonComponent } from './buttons'
+import { CustomPageService } from './custom-page'
 import { DateToggleComponent } from './date'
 import { FeedComponent } from './feeds'
 import { LoaderComponent, SmallLoaderComponent } from './loaders'
@@ -171,7 +172,9 @@ import { VideoChannelService } from './video-channel'
 
     VideoCaptionService,
 
-    VideoChannelService
+    VideoChannelService,
+
+    CustomPageService
   ]
 })
 export class SharedMainModule { }