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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | 5x 5x 5x 5x 5x 5x 10x 10x 10x 10x 10x 10x 10x 10x 76x 76x 76x 76x 76x 76x 6x 2x 2x 2x 74x 74x 3x 74x 2x 9x 3x 3x 3x 3x 3x 3x 5x | import { Inject, Injectable, Logger } from '@nestjs/common'; import * as format from 'string-format'; import { I18N_OPTIONS, I18N_TRANSLATIONS, I18N_LANGUAGES, I18N_LANGUAGES_SUBJECT, I18N_TRANSLATIONS_SUBJECT, } from '../i18n.constants'; import { I18nOptions } from '..'; import { I18nTranslation } from '../interfaces/i18n-translation.interface'; import * as _ from 'lodash'; import { Observable, BehaviorSubject } from 'rxjs'; import { I18nParser } from '../parsers/i18n.parser'; import { take } from 'rxjs/operators'; export type translateOptions = { lang?: string; args?: ({ [k: string]: any } | string)[] | { [k: string]: any }; }; @Injectable() export class I18nService { constructor( @Inject(I18N_OPTIONS) private readonly i18nOptions: I18nOptions, @Inject(I18N_TRANSLATIONS) private readonly translations: Observable<I18nTranslation>, @Inject(I18N_LANGUAGES) private readonly supportedLanguages: Observable<string[]>, private readonly logger: Logger, private readonly parser: I18nParser, @Inject(I18N_LANGUAGES_SUBJECT) private readonly languagesSubject: BehaviorSubject<string[]>, @Inject(I18N_TRANSLATIONS_SUBJECT) private readonly translationsSubject: BehaviorSubject<I18nTranslation>, ) {} public async translate( key: string, options?: translateOptions, ): Promise<string> { options = { lang: this.i18nOptions.fallbackLanguage, ...options, }; const { args } = options; let { lang } = options; lang = lang === undefined || lang === null ? this.i18nOptions.fallbackLanguage : lang; const translationsByLanguage = ( await this.translations.pipe(take(1)).toPromise() )[lang]; if ( translationsByLanguage === undefined || translationsByLanguage === null || (!!translationsByLanguage && !translationsByLanguage.hasOwnProperty(key)) ) { if (lang !== this.i18nOptions.fallbackLanguage) { const message = `Translation "${key}" in "${lang}" does not exist.`; this.logger.error(message); return this.translate(key, { lang: this.i18nOptions.fallbackLanguage, args, }); } } let translation = translationsByLanguage ? translationsByLanguage[key] : key; if (translation && (args || (args instanceof Array && args.length > 0))) { translation = format( translation, ...(args instanceof Array ? args || [] : [args]), ); } return translation || key; } public t(key: string, options?: translateOptions) { return this.translate(key, options); } public async getSupportedLanguages() { return this.supportedLanguages.pipe(take(1)).toPromise(); } public async refresh() { const translations = await this.parser.parse(); Iif (translations instanceof Observable) { this.translationsSubject.next( await translations.pipe(take(1)).toPromise(), ); } else { this.translationsSubject.next(translations); } const languages = await this.parser.languages(); Iif (languages instanceof Observable) { this.languagesSubject.next(await languages.pipe(take(1)).toPromise()); } else { this.languagesSubject.next(languages); } } } |