EmailValidator::hasDNSRecord() - Code Metrics - Inspection of "Merge pull request #18588 from ihitbuttons/18585-e..." - yiisoft/yii2 - Measure and Improve Code Quality continuously with Scrutinizer

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by Dmitry

created 2021-04-07 18:55 UTC

EmailValidator::hasDNSRecord() A

↳ Parent: EmailValidator

Complexity

Conditions	5
Paths	3

Size

Total Lines	15
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	4
CRAP Score	5.2

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	5
eloc	8
c	1
b	0
f	0
nc	3
nop	2
dl	0
loc	15
ccs	4
cts	5
cp	0.8
crap	5.2
rs	9.6111

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\validators;

use Yii;
use yii\base\ErrorException;
use yii\base\InvalidConfigException;
use yii\helpers\Json;
use yii\web\JsExpression;

/**
 * EmailValidator validates that the attribute value is a valid email address.
 *
 * @author Qiang Xue <[email protected]>
 * @since 2.0
 */
class EmailValidator extends Validator
{
    /**
     * @var string the regular expression used to validate the attribute value.
     * @see http://www.regular-expressions.info/email.html
     */
    public $pattern = '/^[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?$/';
    /**
     * @var string the regular expression used to validate email addresses with the name part.
     * This property is used only when [[allowName]] is true.
     * @see allowName
     */
    public $fullPattern = '/^[^@]*<[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?>$/';
    /**
     * @var string the regular expression used to validate the part before the @ symbol, used if ASCII conversion fails to validate the address.
     * @see http://www.regular-expressions.info/email.html
     * @since 2.0.42
     */
    public $patternASCII = '/^[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+)*$/';
    /**
     * @var string the regular expression used to validate email addresses with the name part before the @ symbol, used if ASCII conversion fails to validate the address.
     * This property is used only when [[allowName]] is true.
     * @see allowName
     * @since 2.0.42
     */
    public $fullPatternASCII = '/^[^@]*<[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+)*$/';
    /**
     * @var bool whether to allow name in the email address (e.g. "John Smith <[email protected]>"). Defaults to false.
     * @see fullPattern
     */
    public $allowName = false;
    /**
     * @var bool whether to check whether the email's domain exists and has either an A or MX record.
     * Be aware that this check can fail due to temporary DNS problems even if the email address is
     * valid and an email would be deliverable. Defaults to false.
     */
    public $checkDNS = false;
    /**
     * @var bool whether validation process should take into account IDN (internationalized domain
     * names). Defaults to false meaning that validation of emails containing IDN will always fail.
     * Note that in order to use IDN validation you have to install and enable `intl` PHP extension,
     * otherwise an exception would be thrown.
     */
    public $enableIDN = false;


    /**
     * {@inheritdoc}
     */
    public function init()
    {
        parent::init();
        if ($this->enableIDN && !function_exists('idn_to_ascii')) {
            throw new InvalidConfigException('In order to use IDN validation intl extension must be installed and enabled.');
        }
        if ($this->message === null) {
            $this->message = Yii::t('yii', '{attribute} is not a valid email address.');
        }
    }

    /**
     * {@inheritdoc}
     */
    protected function validateValue($value)
    {
        if (!is_string($value)) {
            $valid = false;
        } elseif (!preg_match('/^(?P<name>(?:"?([^"]*)"?\s)?)(?:\s+)?(?:(?P<open><?)((?P<local>.+)@(?P<domain>[^>]+))(?P<close>>?))$/i', $value, $matches)) {
            $valid = false;
        } else {
            if ($this->enableIDN) {
                $matches['local'] = $this->idnToAsciiWithFallback($matches['local']);
                $matches['domain'] = $this->idnToAscii($matches['domain']);
                $value = $matches['name'] . $matches['open'] . $matches['local'] . '@' . $matches['domain'] . $matches['close'];
            }

            if (strlen($matches['local']) > 64) {
                // The maximum total length of a user name or other local-part is 64 octets. RFC 5322 section 4.5.3.1.1
                // http://tools.ietf.org/html/rfc5321#section-4.5.3.1.1
                $valid = false;
            } elseif (strlen($matches['local'] . '@' . $matches['domain']) > 254) {
                // There is a restriction in RFC 2821 on the length of an address in MAIL and RCPT commands
                // of 254 characters. Since addresses that do not fit in those fields are not normally useful, the
                // upper limit on address lengths should normally be considered to be 254.
                //
                // Dominic Sayers, RFC 3696 erratum 1690
                // http://www.rfc-editor.org/errata_search.php?eid=1690
                $valid = false;
            } else {
                $valid = preg_match($this->pattern, $value) || ($this->allowName && preg_match($this->fullPattern, $value));
                if ($valid && $this->checkDNS) {
                    $valid = $this->isDNSValid($matches['domain']);
                }
            }
        }

        return $valid ? null : [$this->message, []];
    }

    /**
     * @param string $domain
     * @return bool if DNS records for domain are valid
     * @see https://github.com/yiisoft/yii2/issues/17083
     */
    protected function isDNSValid($domain)
    {
        return $this->hasDNSRecord($domain, true) || $this->hasDNSRecord($domain, false);
    }

    private function hasDNSRecord($domain, $isMX)
    {
        $normalizedDomain = $domain . '.';
        if (!checkdnsrr($normalizedDomain, ($isMX ? 'MX' : 'A'))) {
            return false;
        }

        try {
            // dns_get_record can return false and emit Warning that may or may not be converted to ErrorException
            $records = dns_get_record($normalizedDomain, ($isMX ? DNS_MX : DNS_A));
        } catch (ErrorException $exception) {
            return false;
        }

        return !empty($records);
    }

    private function idnToAscii($idn)
    {
        if (PHP_VERSION_ID < 50600) {
            // TODO: drop old PHP versions support
            return idn_to_ascii($idn);
        }

        return idn_to_ascii($idn, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
    }

    /**
     * {@inheritdoc}
     */
    public function clientValidateAttribute($model, $attribute, $view)
    {
        ValidationAsset::register($view);
        if ($this->enableIDN) {
            PunycodeAsset::register($view);
        }
        $options = $this->getClientOptions($model, $attribute);

        return 'yii.validation.email(value, messages, ' . Json::htmlEncode($options) . ');';
    }

    /**
     * {@inheritdoc}
     */
    public function getClientOptions($model, $attribute)
    {
        $options = [
            'pattern' => new JsExpression($this->pattern),
            'fullPattern' => new JsExpression($this->fullPattern),
            'allowName' => $this->allowName,
            'message' => $this->formatMessage($this->message, [
                'attribute' => $model->getAttributeLabel($attribute),
            ]),
            'enableIDN' => (bool) $this->enableIDN,
        ];
        if ($this->skipOnEmpty) {
            $options['skipOnEmpty'] = 1;
        }

        return $options;
    }

    /**
     * @param string $value
     * @return string|bool returns string if it is valid and/or can be converted, bool false if it can't be converted and/or is invalid
     * @see https://github.com/yiisoft/yii2/issues/18585
     */
    private function idnToAsciiWithFallback($value)
    {
        $ascii = $this->idnToAscii($value);
        if ($ascii === false) {
            if (preg_match($this->patternASCII, $value) || ($this->allowName && preg_match($this->fullPatternASCII, $value))) {
                return $value;
            }
        }

        return $ascii;
    }
}


1		<?php
2		/**
3		* @link http://www.yiiframework.com/
4		* @copyright Copyright (c) 2008 Yii Software LLC
5		* @license http://www.yiiframework.com/license/
6		*/
7
8		namespace yii\validators;
9
10		use Yii;
11		use yii\base\ErrorException;
12		use yii\base\InvalidConfigException;
13		use yii\helpers\Json;
14		use yii\web\JsExpression;
15
16		/**
17		* EmailValidator validates that the attribute value is a valid email address.
18		*
19		* @author Qiang Xue <[email protected]>
20		* @since 2.0
21		*/
22		class EmailValidator extends Validator
23		{
24		/**
25		* @var string the regular expression used to validate the attribute value.
26		* @see http://www.regular-expressions.info/email.html
27		*/
28		public $pattern = '/^[a-zA-Z0-9!#$%&\'+\\/=?^_`{\|}~-]+(?:\.[a-zA-Z0-9!#$%&\'+\\/=?^_`{\|}~-]+)@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-][a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?$/';
29		/**
30		* @var string the regular expression used to validate email addresses with the name part.
31		* This property is used only when [[allowName]] is true.
32		* @see allowName
33		*/
34		public $fullPattern = '/^[^@]<[a-zA-Z0-9!#$%&\'+\\/=?^_`{\|}~-]+(?:\.[a-zA-Z0-9!#$%&\'+\\/=?^_`{\|}~-]+)@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-][a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-][a-zA-Z0-9])?>$/';
35		/**
36		* @var string the regular expression used to validate the part before the @ symbol, used if ASCII conversion fails to validate the address.
37		* @see http://www.regular-expressions.info/email.html
38		* @since 2.0.42
39		*/
40		public $patternASCII = '/^[a-zA-Z0-9!#$%&\'+\\/=?^_`{\|}~-]+(?:\.[a-zA-Z0-9!#$%&\'+\\/=?^_`{\|}~-]+)*$/';
41		/**
42		* @var string the regular expression used to validate email addresses with the name part before the @ symbol, used if ASCII conversion fails to validate the address.
43		* This property is used only when [[allowName]] is true.
44		* @see allowName
45		* @since 2.0.42
46		*/
47		public $fullPatternASCII = '/^[^@]<[a-zA-Z0-9!#$%&\'+\\/=?^_`{\|}~-]+(?:\.[a-zA-Z0-9!#$%&\'+\\/=?^_`{\|}~-]+)$/';
48		/**
49		* @var bool whether to allow name in the email address (e.g. "John Smith <[email protected]>"). Defaults to false.
50		* @see fullPattern
51		*/
52		public $allowName = false;
53		/**
54		* @var bool whether to check whether the email's domain exists and has either an A or MX record.
55		* Be aware that this check can fail due to temporary DNS problems even if the email address is
56		* valid and an email would be deliverable. Defaults to false.
57		*/
58	42	public $checkDNS = false;
59		/**
60	42	* @var bool whether validation process should take into account IDN (internationalized domain
61	42	* names). Defaults to false meaning that validation of emails containing IDN will always fail.
62		* Note that in order to use IDN validation you have to install and enable `intl` PHP extension,
63		* otherwise an exception would be thrown.
64	42	*/
65	42	public $enableIDN = false;
66
67	42
68		/**
69		* {@inheritdoc}
70		*/
71		public function init()
72	41	{
73		parent::init();
74	41	if ($this->enableIDN && !function_exists('idn_to_ascii')) {
75	1	throw new InvalidConfigException('In order to use IDN validation intl extension must be installed and enabled.');
76	41	}
77	4	if ($this->message === null) {
78		$this->message = Yii::t('yii', '{attribute} is not a valid email address.');
79	39	}
80	18	}
81	18
82	18	/**
83		* {@inheritdoc}
84		*/
85	39	protected function validateValue($value)
86		{
87		if (!is_string($value)) {
88	1	$valid = false;
89	39	} elseif (!preg_match('/^(?P<name>(?:"?([^"]*)"?\s)?)(?:\s+)?(?:(?P<open><?)((?P<local>.+)@(?P<domain>[^>]+))(?P<close>>?))$/i', $value, $matches)) {
90		$valid = false;
91		} else {
92		if ($this->enableIDN) {
93		$matches['local'] = $this->idnToAsciiWithFallback($matches['local']);
94		$matches['domain'] = $this->idnToAscii($matches['domain']);
95		$value = $matches['name'] . $matches['open'] . $matches['local'] . '@' . $matches['domain'] . $matches['close'];
96	1	}
97
98	39	if (strlen($matches['local']) > 64) {
99	39	// The maximum total length of a user name or other local-part is 64 octets. RFC 5322 section 4.5.3.1.1
100	1	// http://tools.ietf.org/html/rfc5321#section-4.5.3.1.1
101		$valid = false;
102		} elseif (strlen($matches['local'] . '@' . $matches['domain']) > 254) {
103		// There is a restriction in RFC 2821 on the length of an address in MAIL and RCPT commands
104		// of 254 characters. Since addresses that do not fit in those fields are not normally useful, the
105	41	// upper limit on address lengths should normally be considered to be 254.
106		//
107		// Dominic Sayers, RFC 3696 erratum 1690
108		// http://www.rfc-editor.org/errata_search.php?eid=1690
109		$valid = false;
110		} else {
111		$valid = preg_match($this->pattern, $value) \|\| ($this->allowName && preg_match($this->fullPattern, $value));
112		if ($valid && $this->checkDNS) {
113	1	$valid = $this->isDNSValid($matches['domain']);
114		}
115	1	}
116		}
117
118	1	return $valid ? null : [$this->message, []];
119		}
120	1
121	1	/**
122	1	* @param string $domain
123		* @return bool if DNS records for domain are valid
124		* @see https://github.com/yiisoft/yii2/issues/17083
125		*/
126		protected function isDNSValid($domain)
127	1	{
128		return $this->hasDNSRecord($domain, true) \|\| $this->hasDNSRecord($domain, false);
129		}
130
131		private function hasDNSRecord($domain, $isMX)
132	1	{
133		$normalizedDomain = $domain . '.';
134		if (!checkdnsrr($normalizedDomain, ($isMX ? 'MX' : 'A'))) {
135	18	return false;
136		}
137	18
138		try {
139		// dns_get_record can return false and emit Warning that may or may not be converted to ErrorException
140		$records = dns_get_record($normalizedDomain, ($isMX ? DNS_MX : DNS_A));
141		} catch (ErrorException $exception) {
142	18	return false;
143		}
144
145		return !empty($records);
146		}
147
148		private function idnToAscii($idn)
149		{
150		if (PHP_VERSION_ID < 50600) {
151		// TODO: drop old PHP versions support
152		return idn_to_ascii($idn);
153		}
154
155		return idn_to_ascii($idn, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
156		}
157
158		/**
159		* {@inheritdoc}
160		*/
161		public function clientValidateAttribute($model, $attribute, $view)
162		{
163		ValidationAsset::register($view);
164		if ($this->enableIDN) {
165		PunycodeAsset::register($view);
166		}
167		$options = $this->getClientOptions($model, $attribute);
168
169		return 'yii.validation.email(value, messages, ' . Json::htmlEncode($options) . ');';
170		}
171
172		/**
173		* {@inheritdoc}
174		*/
175		public function getClientOptions($model, $attribute)
176		{
177		$options = [
178		'pattern' => new JsExpression($this->pattern),
179		'fullPattern' => new JsExpression($this->fullPattern),
180		'allowName' => $this->allowName,
181		'message' => $this->formatMessage($this->message, [
182		'attribute' => $model->getAttributeLabel($attribute),
183		]),
184		'enableIDN' => (bool) $this->enableIDN,
185		];
186		if ($this->skipOnEmpty) {
187		$options['skipOnEmpty'] = 1;
188		}
189
190		return $options;
191		}
192
193		/**
194		* @param string $value
195		* @return string\|bool returns string if it is valid and/or can be converted, bool false if it can't be converted and/or is invalid
196		* @see https://github.com/yiisoft/yii2/issues/18585
197		*/
198		private function idnToAsciiWithFallback($value)
199		{
200		$ascii = $this->idnToAscii($value);
201		if ($ascii === false) {
202		if (preg_match($this->patternASCII, $value) \|\| ($this->allowName && preg_match($this->fullPatternASCII, $value))) {
203		return $value;
204		}
205		}
206
207		return $ascii;
208		}
209		}
210

yiisoft / yii2

Push — master ( 5ee387...9cea74 )

EmailValidator::hasDNSRecord() A

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