[ADF-2973] Angular pipe to get application configuration settings (#3301)

* app config pipe

* update docs

lib/core/app-config/app-config.module.ts

@@ -18,13 +18,20 @@
 import { HttpClientModule } from '@angular/common/http';
 import { NgModule } from '@angular/core';
 import { AppConfigService } from './app-config.service';
+import { AppConfigPipe } from './app-config.pipe';
 
 @NgModule({
     imports: [
         HttpClientModule
     ],
+    declarations: [
+        AppConfigPipe
+    ],
     providers: [
         AppConfigService
+    ],
+    exports: [
+        AppConfigPipe
     ]
 })
 export class AppConfigModule {

lib/core/app-config/app-config.pipe.ts

@@ -0,0 +1,30 @@
+/*!
+ * @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 { Pipe, PipeTransform } from '@angular/core';
+import { AppConfigService } from './app-config.service';
+
+@Pipe({
+    name: 'adfAppConfig'
+})
+export class AppConfigPipe implements PipeTransform {
+    constructor(private config: AppConfigService) {}
+
+    transform(value: string, fallback: any): any {
+        return this.config.get(value, fallback);
+    }
+}

lib/core/app-config/public-api.ts

@@ -16,5 +16,6 @@
  */
 
 export * from './app-config.service';
+export * from './app-config.pipe';
 
 export * from './app-config.module';