services/self-service/src/main/resources/webapp/src/app/core/services/checkParams.guard.ts

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { Observable } from 'rxjs';
import { map } from 'rxjs/operators';

import { ApplicationSecurityService } from './applicationSecurity.service';

@Injectable()
export class CheckParamsGuard implements CanActivate {
  result: any;

  constructor(private applicationSecurityService: ApplicationSecurityService) { }

  canActivate(next: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<any> | Promise<boolean> | boolean {
    return this.applicationSecurityService.isLoggedIn().pipe(
      map(authState => {
        const search = document.URL.split('?')[1];

        if (search && this.checkParamsCoincidence(search)) {
          this.result = search.split('&').reduce(function (prev, curr) {
            const params = curr.split('=');
            prev[decodeURIComponent(params[0])] = decodeURIComponent(params[1]);
            return prev;
          }, {});

          return this.applicationSecurityService
            .redirectParams(this.result)
            .toPromise();
        }
        if (!authState)
          this.applicationSecurityService.locationCheck().subscribe(location => window.location.href = location);
        return !!authState;
      }));
  }

  private checkParamsCoincidence(search): boolean {
    return ['code', 'state', 'error', 'error_description'].some(el =>
      search.indexOf(el)
    );
  }
}