client/src/app/core/theme/theme.service.ts

   1 import { Injectable } from '@angular/core'
   2 import { UserLocalStorageKeys } from '@root-helpers/users'
   3 import { HTMLServerConfig, ServerConfigTheme } from '@shared/models'
   4 import { environment } from '../../../environments/environment'
   5 import { AuthService } from '../auth'
   6 import { PluginService } from '../plugins/plugin.service'
   7 import { ServerService } from '../server'
   8 import { UserService } from '../users/user.service'
   9 import { LocalStorageService } from '../wrappers/storage.service'
  10
  11 @Injectable()
  12 export class ThemeService {
  13
  14   private oldThemeName: string
  15   private themes: ServerConfigTheme[] = []
  16
  17   private themeFromLocalStorage: ServerConfigTheme
  18   private themeDOMLinksFromLocalStorage: HTMLLinkElement[] = []
  19
  20   private serverConfig: HTMLServerConfig
  21
  22   constructor (
  23     private auth: AuthService,
  24     private userService: UserService,
  25     private pluginService: PluginService,
  26     private server: ServerService,
  27     private localStorageService: LocalStorageService
  28   ) {}
  29
  30   initialize () {
  31     // Try to load from local storage first, so we don't have to wait network requests
  32     this.loadAndSetFromLocalStorage()
  33
  34     this.serverConfig = this.server.getHTMLConfig()
  35     const themes = this.serverConfig.theme.registered
  36
  37     this.removeThemeFromLocalStorageIfNeeded(themes)
  38     this.injectThemes(themes)
  39
  40     this.listenUserTheme()
  41   }
  42
  43   private injectThemes (themes: ServerConfigTheme[], fromLocalStorage = false) {
  44     this.themes = themes
  45
  46     console.log('Injecting %d themes.', this.themes.length)
  47
  48     const head = this.getHeadElement()
  49
  50     for (const theme of this.themes) {
  51       // Already added this theme?
  52       if (fromLocalStorage === false && this.themeFromLocalStorage && this.themeFromLocalStorage.name === theme.name) continue
  53
  54       for (const css of theme.css) {
  55         const link = document.createElement('link')
  56
  57         const href = environment.apiUrl + `/themes/${theme.name}/${theme.version}/css/${css}`
  58         link.setAttribute('href', href)
  59         link.setAttribute('rel', 'alternate stylesheet')
  60         link.setAttribute('type', 'text/css')
  61         link.setAttribute('title', theme.name)
  62         link.setAttribute('disabled', '')
  63
  64         if (fromLocalStorage === true) this.themeDOMLinksFromLocalStorage.push(link)
  65
  66         head.appendChild(link)
  67       }
  68     }
  69   }
  70
  71   private getCurrentTheme () {
  72     if (this.themeFromLocalStorage) return this.themeFromLocalStorage.name
  73
  74     const theme = this.auth.isLoggedIn()
  75       ? this.auth.getUser().theme
  76       : this.userService.getAnonymousUser().theme
  77
  78     if (theme !== 'instance-default') return theme
  79
  80     const instanceTheme = this.serverConfig.theme.default
  81     if (instanceTheme !== 'default') return instanceTheme
  82
  83     // Default to dark theme if available and wanted by the user
  84     if (
  85       this.themes.find(t => t.name === 'dark') &&
  86       window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches
  87     ) {
  88       return 'dark'
  89     }
  90
  91     return instanceTheme
  92   }
  93
  94   private loadTheme (name: string) {
  95     const links = document.getElementsByTagName('link')
  96     for (let i = 0; i < links.length; i++) {
  97       const link = links[i]
  98       if (link.getAttribute('rel').includes('style') && link.getAttribute('title')) {
  99         link.disabled = link.getAttribute('title') !== name
 100       }
 101     }
 102   }
 103
 104   private updateCurrentTheme () {
 105     if (this.oldThemeName) this.removeThemePlugins(this.oldThemeName)
 106
 107     const currentTheme = this.getCurrentTheme()
 108
 109     console.log('Enabling %s theme.', currentTheme)
 110
 111     this.loadTheme(currentTheme)
 112
 113     const theme = this.getTheme(currentTheme)
 114     if (theme) {
 115       console.log('Adding scripts of theme %s.', currentTheme)
 116
 117       this.pluginService.addPlugin(theme, true)
 118
 119       this.pluginService.reloadLoadedScopes()
 120
 121       this.localStorageService.setItem(UserLocalStorageKeys.LAST_ACTIVE_THEME, JSON.stringify(theme), false)
 122     } else {
 123       this.localStorageService.removeItem(UserLocalStorageKeys.LAST_ACTIVE_THEME, false)
 124     }
 125
 126     this.oldThemeName = currentTheme
 127   }
 128
 129   private listenUserTheme () {
 130     // We don't need them anymore
 131     this.themeFromLocalStorage = undefined
 132     this.themeDOMLinksFromLocalStorage = []
 133
 134     if (!this.auth.isLoggedIn()) {
 135       this.updateCurrentTheme()
 136
 137       this.localStorageService.watch([ UserLocalStorageKeys.THEME ]).subscribe(
 138         () => this.updateCurrentTheme()
 139       )
 140     }
 141
 142     this.auth.userInformationLoaded
 143       .subscribe(() => this.updateCurrentTheme())
 144   }
 145
 146   private loadAndSetFromLocalStorage () {
 147     const lastActiveThemeString = this.localStorageService.getItem(UserLocalStorageKeys.LAST_ACTIVE_THEME)
 148     if (!lastActiveThemeString) return
 149
 150     try {
 151       const lastActiveTheme = JSON.parse(lastActiveThemeString)
 152       this.themeFromLocalStorage = lastActiveTheme
 153
 154       this.injectThemes([ lastActiveTheme ], true)
 155       this.updateCurrentTheme()
 156     } catch (err) {
 157       console.error('Cannot parse last active theme.', err)
 158       return
 159     }
 160   }
 161
 162   private removeThemePlugins (themeName: string) {
 163     const oldTheme = this.getTheme(themeName)
 164     if (oldTheme) {
 165       console.log('Removing scripts of old theme %s.', themeName)
 166       this.pluginService.removePlugin(oldTheme)
 167     }
 168   }
 169
 170   private removeThemeFromLocalStorageIfNeeded (themes: ServerConfigTheme[]) {
 171     if (!this.themeFromLocalStorage) return
 172
 173     const loadedTheme = themes.find(t => t.name === this.themeFromLocalStorage.name)
 174     if (!loadedTheme || loadedTheme.version !== this.themeFromLocalStorage.version) {
 175       // Need to remove this theme: we loaded an old version or a theme that does not exist anymore
 176       this.removeThemePlugins(this.themeFromLocalStorage.name)
 177       this.oldThemeName = undefined
 178
 179       const head = this.getHeadElement()
 180       for (const htmlLinkElement of this.themeDOMLinksFromLocalStorage) {
 181         head.removeChild(htmlLinkElement)
 182       }
 183
 184       this.themeFromLocalStorage = undefined
 185       this.themeDOMLinksFromLocalStorage = []
 186     }
 187   }
 188
 189   private getHeadElement () {
 190     return document.getElementsByTagName('head')[0]
 191   }
 192
 193   private getTheme (name: string) {
 194     return this.themes.find(t => t.name === name)
 195   }
 196 }