client/angular/videos/videos.service.ts

   1 import { Injectable } from '@angular/core';
   2 import { Http, Response, RequestOptions, URLSearchParams } from '@angular/http';
   3 import { Observable } from 'rxjs/Rx';
   4
   5 import { Pagination } from './pagination';
   6 import { Video } from './video';
   7 import { AuthService } from '../users/services/auth.service';
   8 import { Search } from '../app/search';
   9
  10 @Injectable()
  11 export class VideosService {
  12   private _baseVideoUrl = '/api/v1/videos/';
  13
  14   constructor (private http: Http, private _authService: AuthService) {}
  15
  16   getVideos(pagination: Pagination) {
  17     const params = this.createPaginationParams(pagination);
  18     return this.http.get(this._baseVideoUrl, { search: params })
  19                     .map(res => res.json())
  20                     .map(this.extractVideos)
  21                     .catch(this.handleError);
  22   }
  23
  24   getVideo(id: string) {
  25     return this.http.get(this._baseVideoUrl + id)
  26                     .map(res => <Video> res.json())
  27                     .catch(this.handleError);
  28   }
  29
  30   removeVideo(id: string) {
  31     const options = this._authService.getAuthRequestOptions();
  32     return this.http.delete(this._baseVideoUrl + id, options)
  33                     .map(res => <number> res.status)
  34                     .catch(this.handleError);
  35   }
  36
  37   searchVideos(search: Search, pagination: Pagination) {
  38     const params = this.createPaginationParams(pagination);
  39     if (search.field) params.set('field', search.field);
  40     return this.http.get(this._baseVideoUrl + 'search/' + encodeURIComponent(search.value), { search: params })
  41                     .map(res => res.json())
  42                     .map(this.extractVideos)
  43                     .catch(this.handleError);
  44   }
  45
  46   private extractVideos (body: any) {
  47     const videos_json = body.data;
  48     const totalVideos = body.total;
  49     const videos = [];
  50     for (const video_json of videos_json) {
  51       videos.push(new Video(video_json));
  52     }
  53
  54     return { videos, totalVideos };
  55   }
  56
  57   private handleError (error: Response) {
  58     console.error(error);
  59     return Observable.throw(error.json().error || 'Server error');
  60   }
  61
  62   private createPaginationParams(pagination: Pagination) {
  63     const params = new URLSearchParams();
  64     const start: number = (pagination.currentPage - 1) * pagination.itemsPerPage;
  65     const count: number = pagination.itemsPerPage;
  66
  67     params.set('start', start.toString());
  68     params.set('count', count.toString());
  69
  70     return params;
  71   }
  72 }