[ADF-4911] migrate identity role service (#5096)

* migrate IdentityRoleService implementation

* update unit tests

* move interfaces to the origin

* move models to proper places

* migrate model to interface

* fix test

* update docs

lib/core/services/identity-role.service.ts

@@ -0,0 +1,128 @@
+/*!
+ * @license
+ * Copyright 2019 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 { HttpClient } from '@angular/common/http';
+import { throwError as observableThrowError, Observable } from 'rxjs';
+import { catchError, map } from 'rxjs/operators';
+import { Pagination } from '@alfresco/js-api';
+import { IdentityRoleModel } from '../models/identity-role.model';
+import { AppConfigService } from '../app-config/app-config.service';
+import { LogService } from './log.service';
+
+export interface IdentityRoleResponseModel {
+    entries: IdentityRoleModel[];
+    pagination: Pagination;
+  }
+
+@Injectable({
+    providedIn: 'root'
+})
+export class IdentityRoleService {
+    contextRoot = '';
+    identityHost = '';
+
+    constructor(
+        protected http: HttpClient,
+        protected appConfig: AppConfigService,
+        protected logService: LogService
+    ) {
+        this.contextRoot = this.appConfig.get('apiHost', '');
+        this.identityHost = this.appConfig.get('identityHost');
+    }
+
+    /**
+     * Ret all roles
+     * @returns List of roles
+     */
+    getRoles(
+        skipCount: number = 0,
+        size: number = 5
+    ): Observable<IdentityRoleResponseModel> {
+        return this.http.get<any>(`${this.identityHost}/roles`).pipe(
+            map(res => {
+                return this.preparePaginationWithRoles(res, skipCount, size);
+            }),
+            catchError(error => this.handleError(error))
+        );
+    }
+
+    private preparePaginationWithRoles(
+        roles: IdentityRoleModel[],
+        skipCount: number = 0,
+        size: number = 5
+    ): IdentityRoleResponseModel {
+        return {
+            entries: roles.slice(skipCount, skipCount + size),
+            pagination: {
+                skipCount: skipCount,
+                maxItems: size,
+                count: roles.length,
+                hasMoreItems: false,
+                totalItems: roles.length
+            }
+        };
+    }
+
+    /**
+     * Add new role
+     * @param newRole Role model
+     * @returns Server result payload
+     */
+    addRole(newRole: IdentityRoleModel): Observable<any> {
+        if (newRole) {
+            const request = newRole;
+            return this.http
+                .post(`${this.identityHost}/roles`, request)
+                .pipe(catchError(error => this.handleError(error)));
+        }
+    }
+
+    /**
+     * Delete existing role
+     * @param deletedRole Role model
+     * @returns Server result payload
+     */
+    deleteRole(deletedRole: IdentityRoleModel): Observable<any> {
+        return this.http
+            .delete(`${this.identityHost}/roles-by-id/${deletedRole.id}`)
+            .pipe(catchError(error => this.handleError(error)));
+    }
+
+    /**
+     * Update existing role
+     * @param updatedRole Role model
+     * @param roleId Role id
+     * @returns Server result payload
+     */
+    updateRole(
+        updatedRole: IdentityRoleModel,
+        roleId: string
+    ): Observable<any> {
+        if (updatedRole && roleId) {
+            const request = updatedRole;
+            return this.http
+                .put(`${this.identityHost}/roles-by-id/${roleId}`, request)
+                .pipe(catchError(error => this.handleError(error)));
+        }
+    }
+
+    private handleError(error: any) {
+        this.logService.error(error);
+        return observableThrowError(error || 'Server error');
+    }
+}