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src/app/services/photon.service.spec.ts

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+/* tslint:disable:no-unused-variable */
+
+import { TestBed, async, inject } from '@angular/core/testing';
+import { PhotonService } from './photon.service';
+
+describe('Service: Photon', () => {
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      providers: [PhotonService]
+    });
+  });
+
+  it('should ...', inject([PhotonService], (service: PhotonService) => {
+    expect(service).toBeTruthy();
+  }));
+});

src/app/services/photon.service.ts

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+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { PhotonFeatureCollection } from '../interfaces/photon';
+import { Observable } from 'rxjs';
+
+/**
+ * Communicates with Photon (https://photon.komoot.io/)
+ */
+@Injectable({
+  providedIn: 'root'
+})
+export class PhotonService{
+
+  constructor(private http: HttpClient) { }
+
+  /**
+   * Sends a query request to Photon and gets response (https://photon.komoot.io/)
+   */
+  sendQueryRequest(queryString: string): Observable<PhotonFeatureCollection> {
+    return this.http.get<PhotonFeatureCollection>("https://photon.komoot.io/api/?q=" + queryString);
+  }
+
+}