index.js

'use strict'

const debug = require('./lib/debug')
const querystring = require('querystring')
const fetch = require('./lib/fetch')
const getToken = require('./lib/token')
const parser = require('./lib/parser')
const assign = require('lodash.assign')
const defaultConfigs = require('./defaultConfig')
const pkg = require('./package.json')
const {
  EDOutput,
  CODES
} = require('eazydict-standard-output')

// 构造请求数据
const getFetchData = (text, token) => {
  /**
   * 全中文，则翻译为英文
   * 否则统一翻译为中文
   *
   * 注意:
   *
   * 使用 auto 的时候，会识别拼音。例如 you 翻译为 “有”
   * 所以强制设为英汉互译
   */
  let from, to

  if (/[\u4e00-\u9fa5]/.test(text)) {
    from = 'zh-CN'
    to = 'en'
  } else {
    from = 'en'
    to = 'zh-CN'
  }

  return {
    client: 't',
    sl: from,
    tl: to,
    hl: 'zh-CN',
    dt: [
      'at', 'bd', 'ex', 'ld', 'md',
      'qca', 'rw', 'rm', 'ss', 't'
    ],
    ie: 'UTF-8',
    oe: 'UTF-8',
    otf: 1,
    ssel: 0,
    tsel: 0,
    kc: 4,
    tk: token,
    q: text
  }
}

// 入口
function main (words, userConfigs) {
  debug('run with arguments %O', {
    words,
    userConfigs
  })

  let configs = assign({}, defaultConfigs, userConfigs)

  debug('use configs %O', configs)

  if (!words) {
    return Promise.reject(new Error('请输入要查询的文字'))
  }

  const baseUrl = 'https://translate.google.cn'
  let fetchBody, url, api

  return getToken(words, configs)
    .then(token => {
      fetchBody = getFetchData(words, token)

      url = `${baseUrl}/#view=home&op=translate&sl=${fetchBody.sl}&tl=${fetchBody.tl}&text=${encodeURIComponent(words)}`
      api = `${baseUrl}/translate_a/single?${querystring.stringify(fetchBody)}`

      debug(`fetch url: ${url.replace(/%/g, '%%')}`)
      debug(`fetch api: ${api.replace(/%/g, '%%')}`)

      return fetch(api, configs)
    })
    .then(data => parser(data, words))
    .catch(error => {
      debug(error)

      if (error.name === 'FetchError') {
        return new EDOutput(CODES.NETWORK_ERROR)
      }

      return new EDOutput(CODES.OTHER)
    })
    .then(output => {
      // 添加插件信息
      output.pluginName = 'Google'
      output.packageName = pkg.name
      output.words = words
      output.url = url

      debug('output: %O', output)

      return output
    })
}

if (require.main === module) {
  // istanbul ignore next
  let word = process.argv.slice(2).join(' ')

  main(word).then(result => {
    console.log(result) // eslint-disable-line no-console
  })
} else {
  module.exports = main
}