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 { Resolve } from '@angular/router'
   5 import { ServerService } from '@app/core'
   6 import { CustomMarkupService } from '@app/shared/shared-custom-markup'
   7 import { AboutHTML, InstanceService } from '@app/shared/shared-instance'
   8 import { About, ServerStats } from '@shared/models/server'
   9
  10 export type ResolverData = {
  11   serverStats: ServerStats
  12   about: About
  13   languages: string[]
  14   categories: string[]
  15   aboutHTML: AboutHTML
  16   descriptionElement: HTMLDivElement
  17 }
  18
  19 @Injectable()
  20 export class AboutInstanceResolver implements Resolve<any> {
  21
  22   constructor (
  23     private instanceService: InstanceService,
  24     private customMarkupService: CustomMarkupService,
  25     private serverService: ServerService
  26   ) {}
  27
  28   resolve (): Observable<ResolverData> {
  29     return forkJoin([
  30       this.buildInstanceAboutObservable(),
  31       this.buildInstanceStatsObservable()
  32     ]).pipe(
  33       map(([
  34         [ about, languages, categories, aboutHTML, { rootElement } ],
  35         serverStats
  36       ]) => {
  37         return {
  38           serverStats,
  39           about,
  40           languages,
  41           categories,
  42           aboutHTML,
  43           descriptionElement: rootElement
  44         }
  45       })
  46     )
  47   }
  48
  49   private buildInstanceAboutObservable () {
  50     return this.instanceService.getAbout()
  51       .pipe(
  52         switchMap(about => {
  53           return forkJoin([
  54             Promise.resolve(about),
  55             this.instanceService.buildTranslatedLanguages(about),
  56             this.instanceService.buildTranslatedCategories(about),
  57             this.instanceService.buildHtml(about),
  58             this.customMarkupService.buildElement(about.instance.description)
  59           ])
  60         })
  61       )
  62   }
  63
  64   private buildInstanceStatsObservable () {
  65     return this.serverService.getServerStats()
  66   }
  67 }