juice-shop

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/*
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 * Copyright (c) 2014-2024 Bjoern Kimminich & the OWASP Juice Shop contributors.
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 * SPDX-License-Identifier: MIT
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 */
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import locales from '../data/static/locales.json'
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import fs = require('fs')
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import { type Request, type Response, type NextFunction } from 'express'
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module.exports = function getLanguageList () { // TODO Refactor and extend to also load backend translations from /i18n/*json and calculate joint percentage/gauge
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  return (req: Request, res: Response, next: NextFunction) => {
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    const languages: Array<{ key: string, lang: any, icons: string[], shortKey: string, percentage: unknown, gauge: string }> = []
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    let count = 0
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    let enContent: any
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    fs.readFile('frontend/dist/frontend/assets/i18n/en.json', 'utf-8', (err, content) => {
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      if (err != null) {
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        next(new Error(`Unable to retrieve en.json language file: ${err.message}`))
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      }
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      enContent = JSON.parse(content)
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      fs.readdir('frontend/dist/frontend/assets/i18n/', (err, languageFiles) => {
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        if (err != null) {
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          next(new Error(`Unable to read i18n directory: ${err.message}`))
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        }
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        languageFiles.forEach((fileName) => {
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          // eslint-disable-next-line @typescript-eslint/no-misused-promises
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          fs.readFile('frontend/dist/frontend/assets/i18n/' + fileName, 'utf-8', async (err, content) => {
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            if (err != null) {
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              next(new Error(`Unable to retrieve ${fileName} language file: ${err.message}`))
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            }
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            const fileContent = JSON.parse(content)
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            const percentage = await calcPercentage(fileContent, enContent)
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            const key = fileName.substring(0, fileName.indexOf('.'))
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            const locale = locales.find((l) => l.key === key)
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            const lang: any = {
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              key,
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              lang: fileContent.LANGUAGE,
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              icons: locale?.icons,
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              shortKey: locale?.shortKey,
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              percentage,
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              gauge: (percentage > 90 ? 'full' : (percentage > 70 ? 'three-quarters' : (percentage > 50 ? 'half' : (percentage > 30 ? 'quarter' : 'empty'))))
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            }
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            if (!(fileName === 'en.json' || fileName === 'tlh_AA.json')) {
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              languages.push(lang)
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            }
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            count++
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            if (count === languageFiles.length) {
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              languages.push({ key: 'en', icons: ['gb', 'us'], shortKey: 'EN', lang: 'English', percentage: 100, gauge: 'full' })
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              languages.sort((a, b) => a.lang.localeCompare(b.lang))
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              res.status(200).json(languages)
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            }
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          })
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        })
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      })
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    })
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    async function calcPercentage (fileContent: any, enContent: any): Promise<number> {
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      const totalStrings = Object.keys(enContent).length
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      let differentStrings = 0
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      return await new Promise((resolve, reject) => {
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        try {
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          for (const key in fileContent) {
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            if (Object.prototype.hasOwnProperty.call(fileContent, key) && fileContent[key] !== enContent[key]) {
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              differentStrings++
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            }
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          }
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          resolve((differentStrings / totalStrings) * 100)
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        } catch (err) {
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          reject(err)
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        }
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      })
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    }
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  }
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}
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