client/src/app/+about/about-instance/about-instance.resolver.ts

   1 import { forkJoin, Observable } from 'rxjs'
   2 import { map, switchMap } from 'rxjs/operators'
   3 import { Injectable } from '@angular/core'
   4 import { ServerService } from '@app/core'
   5 import { CustomMarkupService } from '@app/shared/shared-custom-markup'
   6 import { AboutHTML, InstanceService } from '@app/shared/shared-instance'
   7 import { About, ServerStats } from '@shared/models/server'
   8
   9 export type ResolverData = {
  10   serverStats: ServerStats
  11   about: About
  12   languages: string[]
  13   categories: string[]
  14   aboutHTML: AboutHTML
  15   descriptionElement: HTMLDivElement
  16 }
  17
  18 @Injectable()
  19 export class AboutInstanceResolver {
  20
  21   constructor (
  22     private instanceService: InstanceService,
  23     private customMarkupService: CustomMarkupService,
  24     private serverService: ServerService
  25   ) {}
  26
  27   resolve (): Observable<ResolverData> {
  28     return forkJoin([
  29       this.buildInstanceAboutObservable(),
  30       this.buildInstanceStatsObservable()
  31     ]).pipe(
  32       map(([
  33         [ about, languages, categories, aboutHTML, { rootElement } ],
  34         serverStats
  35       ]) => {
  36         return {
  37           serverStats,
  38           about,
  39           languages,
  40           categories,
  41           aboutHTML,
  42           descriptionElement: rootElement
  43         }
  44       })
  45     )
  46   }
  47
  48   private buildInstanceAboutObservable () {
  49     return this.instanceService.getAbout()
  50       .pipe(
  51         switchMap(about => {
  52           return forkJoin([
  53             Promise.resolve(about),
  54             this.instanceService.buildTranslatedLanguages(about),
  55             this.instanceService.buildTranslatedCategories(about),
  56             this.instanceService.buildHtml(about),
  57             this.customMarkupService.buildElement(about.instance.description)
  58           ])
  59         })
  60       )
  61   }
  62
  63   private buildInstanceStatsObservable () {
  64     return this.serverService.getServerStats()
  65   }
  66 }