wechat_util.js

// https://github.com/node-weixin/node-weixin-util

const crypto = require('validator')

export default {
  getNonce: function (length) {
    length = length || 32
    var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
    var pos = chars.length
    var nonces = []
    var i
    for (i = 0; i < length; i++) {
      nonces.push(chars.charAt(Math.floor(Math.random() * pos)))
    }
    return nonces.join('')
  },
  /**
   * Marshalling object keys to be sorted alphabetically and then translated to url parameters
   *
   * @param params
   * @returns {string}
   */
  marshall: function (params) {
    params = params || {}
    var keys = Object.keys(params).sort()
    var obj = {}, kvs = []
    for (var i = 0; i < keys.length; i++) {
      var k = keys[i]
      if (params[k]) {
        obj[k] = params[k]
        kvs.push(keys[i] + '=' + params[k])
      }
    }
    return kvs.join('&')
  },
  toXml: function (params) {
    var lines = []
    lines.push('<xml>')
    for (var k in params) {
      if (!params[k]) {
        continue
      }
      if (isNumeric(params[k])) {
        lines.push('<' + k + '>' + params[k] + '</' + k + '>')
      } else {
        lines.push('<' + k + '><![CDATA[' + params[k] + ']]></' + k + '>')
      }
    }
    lines.push('</xml>')
    return lines.join('')
  },
  toParam: function (params) {
    params = params || {}
    var keys = []
    for (var k in params) {
      keys.push(encodeURIComponent(k) + '=' + encodeURIComponent(params[k]))
    }
    return keys.join('&')
  }
}

function isNumeric (n) {
  return !isNaN(parseFloat(n)) && isFinite(n)
}