[ACA-805] extensions metadata, basic extensibility for demo shell (#3966)

* bootstrap extensibility in demo shell app

* example data

* parse and store plugin metadata

* preserve root config metadata

* show plugin info in the About box

* update tests

* update gitignore

* remove unused imports

* disable flaky test

* add missing tsconfig entries

* use pre-build project as CLI 6+ does

* update package scripts

* update tsconfig

* make dist builds work locally

* update scripts

* Revert "update scripts"

This reverts commit 58d218643fe22d642ad7f3ac67f9089ed69ec33e.

* update scripts

* use lib paths

* update configs

* update tsconfig

demo-shell/src/app/extensions/extension.service.ts

@@ -0,0 +1,56 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Injectable } from '@angular/core';
+import {
+    ExtensionService,
+    ExtensionConfig,
+    ExtensionRef
+} from '@alfresco/adf-extensions';
+import { Observable, BehaviorSubject } from 'rxjs';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class AppExtensionService {
+    private _references = new BehaviorSubject<ExtensionRef[]>([]);
+
+    references$: Observable<ExtensionRef[]>;
+
+    constructor(private extensions: ExtensionService) {
+        this.references$ = this._references.asObservable();
+    }
+
+    async load() {
+        const config = await this.extensions.load();
+        this.setup(config);
+    }
+
+    setup(config: ExtensionConfig) {
+        if (!config) {
+            console.error('Extension configuration not found');
+            return;
+        }
+        // tslint:disable-next-line:no-console
+        console.log('loaded extension config', config);
+
+        const references = (config.$references || [])
+            .filter(entry => typeof entry === 'object')
+            .map(entry => <ExtensionRef> entry);
+        this._references.next(references);
+    }
+}

demo-shell/src/app/extensions/extensions.module.ts

@@ -0,0 +1,51 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { NgModule, ModuleWithProviders, APP_INITIALIZER } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { CoreModule } from '@alfresco/adf-core';
+import { AppExtensionService } from './extension.service';
+import { ExtensionsModule } from '@alfresco/adf-extensions';
+
+export function setupExtensions(service: AppExtensionService): Function {
+    return () => service.load();
+}
+
+@NgModule({
+    imports: [CommonModule, CoreModule.forChild(), ExtensionsModule]
+})
+export class AppExtensionsModule {
+    static forRoot(): ModuleWithProviders {
+        return {
+            ngModule: AppExtensionsModule,
+            providers: [
+                {
+                    provide: APP_INITIALIZER,
+                    useFactory: setupExtensions,
+                    deps: [AppExtensionService],
+                    multi: true
+                }
+            ]
+        };
+    }
+
+    static forChild(): ModuleWithProviders {
+        return {
+            ngModule: AppExtensionsModule
+        };
+    }
+}