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1 <?php
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2
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3 /*
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4 * This file is part of the Symfony package.
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5 *
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6 * (c) Fabien Potencier <fabien@symfony.com>
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7 *
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8 * For the full copyright and license information, please view the LICENSE
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9 * file that was distributed with this source code.
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10 */
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11
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12 namespace Symfony\Component\Validator\Constraints;
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13
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14 use Egulias\EmailValidator\Validation\EmailValidation;
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15 use Egulias\EmailValidator\Validation\NoRFCWarningsValidation;
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16 use Symfony\Component\Validator\Constraint;
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17 use Symfony\Component\Validator\ConstraintValidator;
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18 use Symfony\Component\Validator\Exception\RuntimeException;
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19 use Symfony\Component\Validator\Exception\UnexpectedTypeException;
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20
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21 /**
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22 * @author Bernhard Schussek <bschussek@gmail.com>
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23 */
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24 class EmailValidator extends ConstraintValidator
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25 {
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26 private $isStrict;
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27
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28 /**
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29 * @param bool $strict
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30 */
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31 public function __construct($strict = false)
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32 {
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33 $this->isStrict = $strict;
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34 }
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35
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36 /**
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37 * {@inheritdoc}
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38 */
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39 public function validate($value, Constraint $constraint)
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40 {
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41 if (!$constraint instanceof Email) {
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42 throw new UnexpectedTypeException($constraint, __NAMESPACE__.'\Email');
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43 }
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44
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45 if (null === $value || '' === $value) {
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46 return;
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47 }
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48
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49 if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
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50 throw new UnexpectedTypeException($value, 'string');
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51 }
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52
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53 $value = (string) $value;
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54
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55 if (null === $constraint->strict) {
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56 $constraint->strict = $this->isStrict;
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57 }
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58
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59 if ($constraint->strict) {
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60 if (!class_exists('\Egulias\EmailValidator\EmailValidator')) {
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61 throw new RuntimeException('Strict email validation requires egulias/email-validator ~1.2|~2.0');
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62 }
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63
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64 $strictValidator = new \Egulias\EmailValidator\EmailValidator();
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65
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66 if (interface_exists(EmailValidation::class) && !$strictValidator->isValid($value, new NoRFCWarningsValidation())) {
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67 $this->context->buildViolation($constraint->message)
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68 ->setParameter('{{ value }}', $this->formatValue($value))
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69 ->setCode(Email::INVALID_FORMAT_ERROR)
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70 ->addViolation();
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71
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72 return;
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73 } elseif (!interface_exists(EmailValidation::class) && !$strictValidator->isValid($value, false, true)) {
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74 $this->context->buildViolation($constraint->message)
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75 ->setParameter('{{ value }}', $this->formatValue($value))
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76 ->setCode(Email::INVALID_FORMAT_ERROR)
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77 ->addViolation();
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78
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79 return;
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80 }
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81 } elseif (!preg_match('/^.+\@\S+\.\S+$/', $value)) {
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82 $this->context->buildViolation($constraint->message)
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83 ->setParameter('{{ value }}', $this->formatValue($value))
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84 ->setCode(Email::INVALID_FORMAT_ERROR)
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85 ->addViolation();
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86
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87 return;
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88 }
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89
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90 $host = (string) substr($value, strrpos($value, '@') + 1);
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91
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92 // Check for host DNS resource records
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93 if ($constraint->checkMX) {
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94 if (!$this->checkMX($host)) {
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95 $this->context->buildViolation($constraint->message)
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96 ->setParameter('{{ value }}', $this->formatValue($value))
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97 ->setCode(Email::MX_CHECK_FAILED_ERROR)
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98 ->addViolation();
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99 }
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100
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101 return;
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102 }
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103
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104 if ($constraint->checkHost && !$this->checkHost($host)) {
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105 $this->context->buildViolation($constraint->message)
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106 ->setParameter('{{ value }}', $this->formatValue($value))
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107 ->setCode(Email::HOST_CHECK_FAILED_ERROR)
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108 ->addViolation();
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109 }
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110 }
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111
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112 /**
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113 * Check DNS Records for MX type.
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114 *
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115 * @param string $host Host
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116 *
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117 * @return bool
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118 */
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119 private function checkMX($host)
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120 {
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121 return '' !== $host && checkdnsrr($host, 'MX');
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122 }
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123
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124 /**
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125 * Check if one of MX, A or AAAA DNS RR exists.
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126 *
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127 * @param string $host Host
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128 *
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129 * @return bool
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130 */
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131 private function checkHost($host)
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132 {
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133 return '' !== $host && ($this->checkMX($host) || (checkdnsrr($host, 'A') || checkdnsrr($host, 'AAAA')));
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134 }
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135 }
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