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4 | daniel-mar | 1 | package com.dominicsayers.isemail; |
2 | |||
3 | import javax.naming.NamingException; |
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4 | |||
5 | /** |
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6 | * @package isemail |
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7 | * @author Dominic Sayers <dominic_sayers@hotmail.com>; Translated from PHP into |
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8 | * Java by Daniel Marschall [www.daniel-marschall.de] |
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9 | * @copyright 2010 Dominic Sayers |
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10 | * @license http://www.opensource.org/licenses/bsd-license.php BSD License |
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11 | * @link http://www.dominicsayers.com/isemail |
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12 | * @version 1.17 - Upper length limit corrected to 254 characters; |
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13 | * Java-Translation 2010-06-13 |
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14 | */ |
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15 | |||
16 | /* |
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17 | * Copyright (c) 2008-2010, Dominic Sayers All rights reserved. |
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18 | * |
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19 | * Redistribution and use in source and binary forms, with or without |
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20 | * modification, are permitted provided that the following conditions are met: |
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21 | * |
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22 | * Redistributions of source code must retain the above copyright notice, this |
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23 | * list of conditions and the following disclaimer. Redistributions in binary |
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24 | * form must reproduce the above copyright notice, this list of conditions and |
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25 | * the following disclaimer in the documentation and/or other materials provided |
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26 | * with the distribution. Neither the name of Dominic Sayers nor the names of |
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27 | * its contributors may be used to endorse or promote products derived from this |
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28 | * software without specific prior written permission. |
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29 | * |
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30 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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31 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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32 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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33 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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34 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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35 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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36 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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37 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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38 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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39 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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40 | * POSSIBILITY OF SUCH DAMAGE. |
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41 | */ |
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42 | |||
43 | public class IsEMail { |
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44 | |||
45 | /** |
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46 | * Checks the syntax of an email address without DNS check. |
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47 | * |
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48 | * @param email |
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49 | * The email address to be checked. |
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50 | * @return True if the email address is valid. |
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51 | */ |
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52 | public static boolean is_email(String email) { |
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53 | return (is_email_diagnosis(email, false) == EMailSyntaxDiagnosis.ISEMAIL_VALID); |
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54 | } |
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55 | |||
56 | /** |
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57 | * Checks the syntax of an email address. |
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58 | * |
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59 | * @param email |
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60 | * The email address to be checked. |
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61 | * @param checkDNS |
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62 | * Whether a DNS check should be performed or not. |
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63 | * @return True if the email address is valid. |
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64 | */ |
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65 | public static boolean is_email(String email, boolean checkDNS) { |
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66 | return (is_email_diagnosis(email, checkDNS) == EMailSyntaxDiagnosis.ISEMAIL_VALID); |
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67 | } |
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68 | |||
69 | /** |
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70 | * Checks the syntax of an email address with diagnosis and without DNS |
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71 | * check. |
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72 | * |
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73 | * @param email |
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74 | * The email address to be checked. |
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75 | * @return A diagnosis of the email syntax. |
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76 | */ |
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77 | public static EMailSyntaxDiagnosis is_email_diagnosis(String email) { |
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78 | return is_email_diagnosis(email, false); |
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79 | } |
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80 | |||
81 | /** |
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82 | * Checks the syntax of an email address with diagnosis. |
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83 | * |
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84 | * @param email |
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85 | * The email address to be checked. |
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86 | * @param checkDNS |
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87 | * Whether a DNS check should be performed or not. |
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88 | * @return A diagnosis of the email syntax. |
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89 | */ |
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90 | public static EMailSyntaxDiagnosis is_email_diagnosis(String email, |
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91 | boolean checkDNS) { |
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92 | |||
93 | if (email == null) |
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94 | email = ""; |
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95 | |||
96 | // Check that 'email' is a valid address. Read the following RFCs to |
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97 | // understand the constraints: |
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98 | // (http://tools.ietf.org/html/rfc5322) |
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99 | // (http://tools.ietf.org/html/rfc3696) |
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100 | // (http://tools.ietf.org/html/rfc5321) |
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101 | // (http://tools.ietf.org/html/rfc4291#section-2.2) |
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102 | // (http://tools.ietf.org/html/rfc1123#section-2.1) |
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103 | |||
104 | // the upper limit on address lengths should normally be considered to |
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105 | // be 254 |
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106 | // (http://www.rfc-editor.org/errata_search.php?rfc=3696) |
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107 | // NB My erratum has now been verified by the IETF so the correct answer |
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108 | // is 254 |
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109 | // |
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110 | // The maximum total length of a reverse-path or forward-path is 256 |
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111 | // characters (including the punctuation and element separators) |
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112 | // (http://tools.ietf.org/html/rfc5321#section-4.5.3.1.3) |
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113 | // NB There is a mandatory 2-character wrapper round the actual address |
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114 | int emailLength = email.length(); |
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115 | // revision 1.17: Max length reduced to 254 (see above) |
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116 | if (emailLength > 254) { |
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117 | return EMailSyntaxDiagnosis.ISEMAIL_TOOLONG; // Too long |
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118 | } |
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119 | |||
120 | // Contemporary email addresses consist of a "local part" separated from |
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121 | // a "domain part" (a fully-qualified domain name) by an at-sign ("@"). |
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122 | // (http://tools.ietf.org/html/rfc3696#section-3) |
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123 | int atIndex = email.lastIndexOf('@'); |
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124 | |||
125 | if (atIndex == -1) { |
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126 | return EMailSyntaxDiagnosis.ISEMAIL_NOAT; // No at-sign |
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127 | } |
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128 | if (atIndex == 0) { |
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129 | return EMailSyntaxDiagnosis.ISEMAIL_NOLOCALPART; // No local part |
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130 | } |
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131 | if (atIndex == emailLength - 1) { |
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132 | // No domain part |
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133 | return EMailSyntaxDiagnosis.ISEMAIL_NODOMAIN; |
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134 | // revision 1.14: Length test bug suggested by Andrew Campbell of |
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135 | // Gloucester, MA |
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136 | } |
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137 | |||
138 | // Sanitize comments |
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139 | // - remove nested comments, quotes and dots in comments |
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140 | // - remove parentheses and dots from quoted strings |
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141 | int braceDepth = 0; |
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142 | boolean inQuote = false; |
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143 | boolean escapeThisChar = false; |
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144 | |||
145 | for (int i = 0; i < emailLength; ++i) { |
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146 | char charX = email.charAt(i); |
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147 | boolean replaceChar = false; |
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148 | |||
149 | if (charX == '\\') { |
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150 | escapeThisChar = !escapeThisChar; // Escape the next character? |
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151 | } else { |
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152 | switch (charX) { |
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153 | case '(': |
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154 | if (escapeThisChar) { |
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155 | replaceChar = true; |
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156 | } else { |
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157 | if (inQuote) { |
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158 | replaceChar = true; |
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159 | } else { |
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160 | if (braceDepth++ > 0) { |
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161 | replaceChar = true; // Increment brace depth |
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162 | } |
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163 | } |
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164 | } |
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165 | |||
166 | break; |
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167 | case ')': |
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168 | if (escapeThisChar) { |
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169 | replaceChar = true; |
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170 | } else { |
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171 | if (inQuote) { |
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172 | replaceChar = true; |
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173 | } else { |
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174 | if (--braceDepth > 0) |
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175 | replaceChar = true; // Decrement brace depth |
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176 | if (braceDepth < 0) { |
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177 | braceDepth = 0; |
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178 | } |
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179 | } |
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180 | } |
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181 | |||
182 | break; |
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183 | case '"': |
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184 | if (escapeThisChar) { |
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185 | replaceChar = true; |
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186 | } else { |
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187 | if (braceDepth == 0) { |
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188 | // Are we inside a quoted string? |
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189 | inQuote = !inQuote; |
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190 | } else { |
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191 | replaceChar = true; |
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192 | } |
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193 | } |
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194 | |||
195 | break; |
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196 | case '.': // Dots don't help us either |
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197 | if (escapeThisChar) { |
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198 | replaceChar = true; |
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199 | } else { |
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200 | if (braceDepth > 0) |
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201 | replaceChar = true; |
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202 | } |
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203 | |||
204 | break; |
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205 | default: |
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206 | } |
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207 | |||
208 | escapeThisChar = false; |
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209 | if (replaceChar) { |
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210 | // Replace the offending character with something harmless |
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211 | // revision 1.12: Line above replaced because PHPLint |
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212 | // doesn't like that syntax |
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213 | email = replaceCharAt(email, i, 'x'); |
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214 | } |
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215 | |||
216 | } |
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217 | } |
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218 | |||
219 | String localPart = PHPFunctions.substr(email, 0, atIndex); |
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220 | String domain = PHPFunctions.substr(email, atIndex + 1); |
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221 | // Folding white space |
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222 | final String FWS = "(?:(?:(?:[ \\t]*(?:\\r\\n))?[ \\t]+)|(?:[ \\t]+(?:(?:\\r\\n)[ \\t]+)*))"; |
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223 | // Let's check the local part for RFC compliance... |
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224 | // |
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225 | // local-part = dot-atom / quoted-string / obs-local-part |
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226 | // obs-local-part = word *("." word) |
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227 | // (http://tools.ietf.org/html/rfc5322#section-3.4.1) |
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228 | // |
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229 | // Problem: need to distinguish between "first.last" and "first"."last" |
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230 | // (i.e. one element or two). And I suck at regexes. |
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231 | |||
232 | String[] dotArray = PHPFunctions.preg_split( |
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233 | "(?m)\\.(?=(?:[^\\\"]*\\\"[^\\\"]*\\\")*(?![^\\\"]*\\\"))", |
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234 | localPart); |
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235 | int partLength = 0; |
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236 | |||
237 | for (String element : dotArray) { |
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238 | // Remove any leading or trailing FWS |
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239 | element = PHPFunctions.preg_replace("^" + FWS + "|" + FWS + "$", |
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240 | "", element); |
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241 | int elementLength = element.length(); |
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242 | |||
243 | if (elementLength == 0) { |
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244 | // Can't have empty element (consecutive dots or |
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245 | // dots at the start or end) |
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246 | return EMailSyntaxDiagnosis.ISEMAIL_ZEROLENGTHELEMENT; |
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247 | } |
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248 | // revision 1.15: Speed up the test and get rid of |
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249 | // "unitialized string offset" notices from PHP |
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250 | |||
251 | // We need to remove any valid comments (i.e. those at the start or |
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252 | // end of the element) |
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253 | if (element.charAt(0) == '(') { |
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254 | int indexBrace = element.indexOf(')'); |
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255 | if (indexBrace != -1) { |
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256 | if (PHPFunctions.preg_match("(?<!\\\\)[\\(\\)]", |
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257 | PHPFunctions.substr(element, 1, indexBrace - 1)) > 0) { |
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258 | // Illegal characters in comment |
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259 | return EMailSyntaxDiagnosis.ISEMAIL_BADCOMMENT_START; |
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260 | } |
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261 | element = PHPFunctions.substr(element, indexBrace + 1, |
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262 | elementLength - indexBrace - 1); |
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263 | elementLength = element.length(); |
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264 | } |
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265 | } |
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266 | |||
267 | if (element.charAt(elementLength - 1) == ')') { |
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268 | int indexBrace = element.lastIndexOf('('); |
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269 | if (indexBrace != -1) { |
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270 | if (PHPFunctions.preg_match("(?<!\\\\)(?:[\\(\\)])", |
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271 | PHPFunctions.substr(element, indexBrace + 1, |
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272 | elementLength - indexBrace - 2)) > 0) { |
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273 | // Illegal characters in comment |
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274 | return EMailSyntaxDiagnosis.ISEMAIL_BADCOMMENT_END; |
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275 | } |
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276 | element = PHPFunctions.substr(element, 0, indexBrace); |
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277 | elementLength = element.length(); |
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278 | } |
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279 | } |
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280 | |||
281 | // Remove any leading or trailing FWS around the element (inside any |
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282 | // comments) |
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283 | element = PHPFunctions.preg_replace("^" + FWS + "|" + FWS + "$", |
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284 | "", element); |
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285 | |||
286 | // What's left counts towards the maximum length for this part |
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287 | if (partLength > 0) |
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288 | partLength++; // for the dot |
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289 | partLength += element.length(); |
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290 | |||
291 | // Each dot-delimited component can be an atom or a quoted string |
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292 | // (because of the obs-local-part provision) |
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293 | |||
294 | if (PHPFunctions.preg_match("(?s)^\"(?:.)*\"$", element) > 0) { |
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295 | // Quoted-string tests: |
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296 | // |
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297 | // Remove any FWS |
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298 | element = PHPFunctions.preg_replace("(?<!\\\\)" + FWS, "", |
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299 | element); |
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300 | // My regex skillz aren't up to distinguishing between \" \\" |
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301 | // \\\" \\\\" etc. |
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302 | // So remove all \\ from the string first... |
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303 | element = PHPFunctions.preg_replace("\\\\\\\\", " ", element); |
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304 | if (PHPFunctions |
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305 | .preg_match( |
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306 | "(?<!\\\\|^)[\"\\r\\n\\x00](?!$)|\\\\\"$|\"\"", |
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307 | element) > 0) { |
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308 | // ", CR, LF and NUL must be escaped, "" is too short |
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309 | return EMailSyntaxDiagnosis.ISEMAIL_UNESCAPEDDELIM; |
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310 | } |
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311 | } else { |
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312 | // Unquoted string tests: |
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313 | // |
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314 | // Period (".") may...appear, but may not be used to start or |
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315 | // end the |
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316 | // local part, nor may two or more consecutive periods appear. |
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317 | // (http://tools.ietf.org/html/rfc3696#section-3) |
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318 | // |
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319 | // A zero-length element implies a period at the beginning or |
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320 | // end of the |
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321 | // local part, or two periods together. Either way it's not |
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322 | // allowed. |
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323 | if (element.equals("")) { |
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324 | // Dots in wrong place |
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325 | return EMailSyntaxDiagnosis.ISEMAIL_EMPTYELEMENT; |
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326 | } |
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327 | |||
328 | // Any ASCII graphic (printing) character other than the |
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329 | // at-sign ("@"), backslash, double quote, comma, or square |
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330 | // brackets may |
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331 | // appear without quoting. If any of that list of excluded |
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332 | // characters |
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333 | // are to appear, they must be quoted |
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334 | // (http://tools.ietf.org/html/rfc3696#section-3) |
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335 | // |
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336 | // Any excluded characters? i.e. 0x00-0x20, (, ), <, >, [, ], :, |
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337 | // ;, @, \, comma, period, " |
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338 | if (PHPFunctions.preg_match( |
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339 | "[\\x00-\\x20\\(\\)<>\\[\\]:;@\\\\,\\.\"]", element) > 0) { |
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340 | // These characters must be in a quoted string |
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341 | return EMailSyntaxDiagnosis.ISEMAIL_UNESCAPEDSPECIAL; |
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342 | } |
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343 | } |
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344 | } |
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345 | |||
346 | if (partLength > 64) { |
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347 | // Local part must be 64 characters or less |
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348 | return EMailSyntaxDiagnosis.ISEMAIL_LOCALTOOLONG; |
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349 | } |
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350 | |||
351 | // Now let's check the domain part... |
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352 | |||
353 | // The domain name can also be replaced by an IP address in square |
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354 | // brackets |
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355 | // (http://tools.ietf.org/html/rfc3696#section-3) |
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356 | // (http://tools.ietf.org/html/rfc5321#section-4.1.3) |
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357 | // (http://tools.ietf.org/html/rfc4291#section-2.2) |
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358 | |||
359 | if (PHPFunctions.preg_match("^\\[(.)+]$", domain) == 1) { |
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360 | // It's an address-literal |
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361 | String addressLiteral = PHPFunctions.substr(domain, 1, domain |
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362 | .length() - 2); |
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363 | |||
364 | String IPv6; |
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365 | int groupMax; |
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366 | |||
367 | // Extract IPv4 part from the end of the address-literal (if there |
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368 | // is one) |
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369 | String[] matchesIP = PHPFunctions |
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370 | .preg_match_to_array( |
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371 | "\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$", |
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372 | addressLiteral); |
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373 | if (matchesIP.length > 0) { |
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374 | int index = addressLiteral.lastIndexOf(matchesIP[0]); |
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375 | |||
376 | if (index == 0) { |
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377 | // Nothing there except a valid IPv4 address, so... |
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378 | return EMailSyntaxDiagnosis.ISEMAIL_VALID; |
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379 | } else { |
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380 | // Assume it's an attempt at a mixed address (IPv6 + IPv4) |
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381 | if (addressLiteral.charAt(index - 1) != ':') { |
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382 | // Character preceding IPv4 address must be ':' |
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383 | return EMailSyntaxDiagnosis.ISEMAIL_IPV4BADPREFIX; |
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384 | } |
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385 | if (!addressLiteral.startsWith("IPv6:")) { |
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386 | // RFC5321 section 4.1.3 |
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387 | return EMailSyntaxDiagnosis.ISEMAIL_IPV6BADPREFIXMIXED; |
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388 | } |
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389 | |||
390 | IPv6 = PHPFunctions.substr(addressLiteral, 5, |
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391 | (index == 7) ? 2 : index - 6); |
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392 | groupMax = 6; |
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393 | } |
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394 | } else { |
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395 | // It must be an attempt at pure IPv6 |
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396 | if (!addressLiteral.startsWith("IPv6:")) { |
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397 | // RFC5321 section 4.1.3 |
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398 | return EMailSyntaxDiagnosis.ISEMAIL_IPV6BADPREFIX; |
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399 | } |
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400 | IPv6 = PHPFunctions.substr(addressLiteral, 5); |
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401 | groupMax = 8; |
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402 | } |
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403 | |||
404 | String[][] matchesIP6 = PHPFunctions.preg_match_all( |
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405 | "^[0-9a-fA-F]{0,4}|\\:[0-9a-fA-F]{0,4}|(.)", IPv6); |
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406 | int groupCount = 0; |
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407 | if (matchesIP6.length > 0) { |
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408 | groupCount = matchesIP6[0].length; |
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409 | } // else: Undefined state (should never be reached) |
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410 | int index = IPv6.indexOf("::"); |
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411 | |||
412 | if (index == -1) { |
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413 | // We need exactly the right number of groups |
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414 | if (groupCount != groupMax) { |
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415 | // RFC5321 section 4.1.3 |
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416 | return EMailSyntaxDiagnosis.ISEMAIL_IPV6GROUPCOUNT; |
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417 | } |
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418 | } else { |
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419 | if (index != IPv6.lastIndexOf("::")) { |
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420 | // More than one '::' |
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421 | return EMailSyntaxDiagnosis.ISEMAIL_IPV6DOUBLEDOUBLECOLON; |
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422 | } |
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423 | groupMax = (index == 0 || index == (IPv6.length() - 2)) ? groupMax |
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424 | : groupMax - 1; |
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425 | if (groupCount > groupMax) { |
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426 | // Too many IPv6 groups in address |
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427 | return EMailSyntaxDiagnosis.ISEMAIL_IPV6TOOMANYGROUPS; |
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428 | } |
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429 | } |
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430 | |||
431 | // Daniel Marschall: For the Java translation, I optimized |
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432 | // the process. Instead of sorting the array (which needs |
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433 | // null-pointer checks and array-length checks) and then |
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434 | // checking element [0], I decided to directly check every |
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435 | // element. |
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436 | |||
437 | // Check for unmatched characters |
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438 | // array_multisort(matchesIP6[1], SORT_DESC); |
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439 | // if ($matchesIP6[1][0] !== '')) { |
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440 | // return EMailResultState.ISEMAIL_IPV6BADCHAR; |
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441 | // } |
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442 | |||
443 | // Check for unmatched characters |
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444 | if (matchesIP6.length > 1) { |
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445 | for (String s : matchesIP6[1]) { |
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446 | if ((s != null) && (!s.equals(""))) { |
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447 | return EMailSyntaxDiagnosis.ISEMAIL_IPV6BADCHAR; |
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448 | } |
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449 | } |
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450 | } // else: Undefined state (should never be reached) |
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451 | |||
452 | // It's a valid IPv6 address, so... |
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453 | return EMailSyntaxDiagnosis.ISEMAIL_VALID; |
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454 | } else { |
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455 | // It's a domain name... |
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456 | |||
457 | // The syntax of a legal Internet host name was specified in RFC-952 |
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458 | // One aspect of host name syntax is hereby changed: the |
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459 | // restriction on the first character is relaxed to allow either a |
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460 | // letter or a digit. |
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461 | // (http://tools.ietf.org/html/rfc1123#section-2.1) |
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462 | // |
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463 | // NB RFC 1123 updates RFC 1035, but this is not currently apparent |
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464 | // from reading RFC 1035. |
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465 | // |
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466 | // Most common applications, including email and the Web, will |
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467 | // generally not |
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468 | // permit...escaped strings |
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469 | // (http://tools.ietf.org/html/rfc3696#section-2) |
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470 | // |
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471 | // the better strategy has now become to make the |
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472 | // "at least one period" test, |
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473 | // to verify LDH conformance (including verification that the |
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474 | // apparent TLD name |
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475 | // is not all-numeric) |
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476 | // (http://tools.ietf.org/html/rfc3696#section-2) |
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477 | // |
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478 | // Characters outside the set of alphabetic characters, digits, and |
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479 | // hyphen MUST NOT appear in domain name |
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480 | // labels for SMTP clients or servers |
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481 | // (http://tools.ietf.org/html/rfc5321#section-4.1.2) |
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482 | // |
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483 | // RFC5321 precludes the use of a trailing dot in a domain name for |
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484 | // SMTP purposes |
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485 | // (http://tools.ietf.org/html/rfc5321#section-4.1.2) |
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486 | |||
487 | dotArray = PHPFunctions.preg_split( |
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488 | "(?m)\\.(?=(?:[^\\\"]*\\\"[^\\\"]*\\\")*(?![^\\\"]*\\\"))", |
||
489 | domain); |
||
490 | partLength = 0; |
||
491 | // Since we use 'element' after the foreach |
||
492 | // loop let's make sure it has a value |
||
493 | String lastElement = ""; |
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494 | // revision 1.13: Line above added because PHPLint now checks for |
||
495 | // Definitely Assigned Variables |
||
496 | |||
497 | if (dotArray.length == 1) { |
||
498 | // Mail host can't be a TLD (cite? What about localhost?) |
||
499 | return EMailSyntaxDiagnosis.ISEMAIL_TLD; |
||
500 | } |
||
501 | |||
502 | for (String element : dotArray) { |
||
503 | lastElement = element; |
||
504 | // Remove any leading or trailing FWS |
||
505 | element = PHPFunctions.preg_replace( |
||
506 | "^" + FWS + "|" + FWS + "$", "", element); |
||
507 | int elementLength = element.length(); |
||
508 | |||
509 | // Each dot-delimited component must be of type atext |
||
510 | // A zero-length element implies a period at the beginning or |
||
511 | // end of the |
||
512 | // local part, or two periods together. Either way it's not |
||
513 | // allowed. |
||
514 | if (elementLength == 0) { |
||
515 | // Dots in wrong place |
||
516 | return EMailSyntaxDiagnosis.ISEMAIL_DOMAINEMPTYELEMENT; |
||
517 | } |
||
518 | // revision 1.15: Speed up the test and get rid of |
||
519 | // "unitialized string offset" notices from PHP |
||
520 | |||
521 | // Then we need to remove all valid comments (i.e. those at the |
||
522 | // start or end of the element |
||
523 | if (element.charAt(0) == '(') { |
||
524 | int indexBrace = element.indexOf(')'); |
||
525 | if (indexBrace != -1) { |
||
526 | if (PHPFunctions |
||
527 | .preg_match("(?<!\\\\)[\\(\\)]", PHPFunctions |
||
528 | .substr(element, 1, indexBrace - 1)) > 0) { |
||
529 | // revision 1.17: Fixed name of constant (also |
||
530 | // spotted by turboflash - thanks!) |
||
531 | // Illegal characters in comment |
||
532 | return EMailSyntaxDiagnosis.ISEMAIL_BADCOMMENT_START; |
||
533 | } |
||
534 | element = PHPFunctions.substr(element, indexBrace + 1, |
||
535 | elementLength - indexBrace - 1); |
||
536 | elementLength = element.length(); |
||
537 | } |
||
538 | } |
||
539 | |||
540 | if (element.charAt(elementLength - 1) == ')') { |
||
541 | int indexBrace = element.lastIndexOf('('); |
||
542 | if (indexBrace != -1) { |
||
543 | if (PHPFunctions.preg_match("(?<!\\\\)(?:[\\(\\)])", |
||
544 | PHPFunctions.substr(element, indexBrace + 1, |
||
545 | elementLength - indexBrace - 2)) > 0) { |
||
546 | // revision 1.17: Fixed name of constant (also |
||
547 | // spotted by turboflash - thanks!) |
||
548 | // Illegal characters in comment |
||
549 | return EMailSyntaxDiagnosis.ISEMAIL_BADCOMMENT_END; |
||
550 | } |
||
551 | |||
552 | element = PHPFunctions.substr(element, 0, indexBrace); |
||
553 | elementLength = element.length(); |
||
554 | } |
||
555 | } |
||
556 | |||
557 | // Remove any leading or trailing FWS around the element (inside |
||
558 | // any comments) |
||
559 | element = PHPFunctions.preg_replace( |
||
560 | "^" + FWS + "|" + FWS + "$", "", element); |
||
561 | |||
562 | // What's left counts towards the maximum length for this part |
||
563 | if (partLength > 0) |
||
564 | partLength++; // for the dot |
||
565 | partLength += element.length(); |
||
566 | |||
567 | // The DNS defines domain name syntax very generally -- a |
||
568 | // string of labels each containing up to 63 8-bit octets, |
||
569 | // separated by dots, and with a maximum total of 255 |
||
570 | // octets. |
||
571 | // (http://tools.ietf.org/html/rfc1123#section-6.1.3.5) |
||
572 | if (elementLength > 63) { |
||
573 | // Label must be 63 characters or less |
||
574 | return EMailSyntaxDiagnosis.ISEMAIL_DOMAINELEMENTTOOLONG; |
||
575 | } |
||
576 | |||
577 | // Any ASCII graphic (printing) character other than the |
||
578 | // at-sign ("@"), backslash, double quote, comma, or square |
||
579 | // brackets may |
||
580 | // appear without quoting. If any of that list of excluded |
||
581 | // characters |
||
582 | // are to appear, they must be quoted |
||
583 | // (http://tools.ietf.org/html/rfc3696#section-3) |
||
584 | // |
||
585 | // If the hyphen is used, it is not permitted to appear at |
||
586 | // either the beginning or end of a label. |
||
587 | // (http://tools.ietf.org/html/rfc3696#section-2) |
||
588 | // |
||
589 | // Any excluded characters? i.e. 0x00-0x20, (, ), <, >, [, ], :, |
||
590 | // ;, @, \, comma, period, " |
||
591 | |||
592 | if (PHPFunctions.preg_match( |
||
593 | "[\\x00-\\x20\\(\\)<>\\[\\]:;@\\\\,\\.\"]|^-|-$", |
||
594 | element) > 0) { |
||
595 | return EMailSyntaxDiagnosis.ISEMAIL_DOMAINBADCHAR; |
||
596 | } |
||
597 | } |
||
598 | |||
599 | if (partLength > 255) { |
||
600 | // Domain part must be 255 characters or less |
||
601 | // (http://tools.ietf.org/html/rfc1123#section-6.1.3.5) |
||
602 | return EMailSyntaxDiagnosis.ISEMAIL_DOMAINTOOLONG; |
||
603 | } |
||
604 | |||
605 | if (PHPFunctions.preg_match("^[0-9]+$", lastElement) > 0) { |
||
606 | // TLD can't be all-numeric |
||
607 | // (http://www.apps.ietf.org/rfc/rfc3696.html#sec-2) |
||
608 | return EMailSyntaxDiagnosis.ISEMAIL_TLDNUMERIC; |
||
609 | } |
||
610 | |||
611 | // Check DNS? |
||
612 | if (checkDNS) { |
||
613 | try { |
||
614 | if (!((DNSLookup.doLookup(domain, DNSType.A) > 0) || (DNSLookup |
||
615 | .doLookup(domain, DNSType.MX) > 0))) { |
||
616 | // Domain doesn't actually exist |
||
617 | return EMailSyntaxDiagnosis.ISEMAIL_DOMAINNOTFOUND; |
||
618 | } |
||
619 | } catch (NamingException e) { |
||
620 | return EMailSyntaxDiagnosis.ISEMAIL_DOMAINNOTFOUND; |
||
621 | } |
||
622 | } |
||
623 | } |
||
624 | |||
625 | // Eliminate all other factors, and the one which remains must be the |
||
626 | // truth. (Sherlock Holmes, The Sign of Four) |
||
627 | return EMailSyntaxDiagnosis.ISEMAIL_VALID; |
||
628 | } |
||
629 | |||
630 | /** |
||
631 | * Replaces a char in a String |
||
632 | * |
||
633 | * @param s |
||
634 | * The input string |
||
635 | * @param pos |
||
636 | * The position of the char to be replaced |
||
637 | * @param c |
||
638 | * The new char |
||
639 | * @return The new String |
||
640 | * @see http://www.rgagnon.com/javadetails/java-0030.html |
||
641 | */ |
||
642 | public static String replaceCharAt(String s, int pos, char c) { |
||
643 | return s.substring(0, pos) + c + s.substring(pos + 1); |
||
644 | } |
||
645 | |||
646 | private IsEMail() { |
||
647 | } |
||
648 | } |