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1exports.email = email2exports.pw = pw3exports.username = username4var requirements = exports.requirements = {5  username: {6    length: 'Name length must be less than or equal to 214 characters long',7    lowerCase: 'Name must be lowercase',8    urlSafe: 'Name may not contain non-url-safe chars',9    dot: 'Name may not start with "."',10    illegal: 'Name may not contain illegal character',11  },12  password: {},13  email: {14    length: 'Email length must be less then or equal to 254 characters long',15    valid: 'Email must be an email address',16  },17}18 19var illegalCharacterRe = new RegExp('([' + [20  "'",21].join() + '])')22 23function username (un) {24  if (un !== un.toLowerCase()) {25    return new Error(requirements.username.lowerCase)26  }27 28  if (un !== encodeURIComponent(un)) {29    return new Error(requirements.username.urlSafe)30  }31 32  if (un.charAt(0) === '.') {33    return new Error(requirements.username.dot)34  }35 36  if (un.length > 214) {37    return new Error(requirements.username.length)38  }39 40  var illegal = un.match(illegalCharacterRe)41  if (illegal) {42    return new Error(requirements.username.illegal + ' "' + illegal[0] + '"')43  }44 45  return null46}47 48function email (em) {49  if (em.length > 254) {50    return new Error(requirements.email.length)51  }52  if (!em.match(/^[^@]+@.+\..+$/)) {53    return new Error(requirements.email.valid)54  }55 56  return null57}58 59function pw () {60  return null61}62