Rfc5322Validator::validateQuotedStringContent() - Code Metrics - Inspection of "fix: reject IPv4 addresses with empty octets in do..." - stymiee/email-validator - Measure and Improve Code Quality continuously with Scrutinizer

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by John

created 2025-06-10 19:09 UTC

Rfc5322Validator::validateQuotedStringContent() B

↳ Parent: Rfc5322Validator

Complexity

Conditions	7
Paths	6

Size

Total Lines	32
Code Lines	15

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	15
c	0
b	0
f	0
dl	0
loc	32
rs	8.8333
cc	7
nc	6
nop	1

<?php

declare(strict_types=1);

namespace EmailValidator\Validator;

use EmailValidator\EmailAddress;

/**
 * Validates email addresses according to RFC 5322 standards
 *
 * This validator implements strict validation rules from RFC 5322 (superseding RFC 822),
 * including proper handling of:
 * - Quoted strings in local part
 * - Comments
 * - Domain literals
 * - Special characters
 * - Length restrictions
 */
class Rfc5322Validator extends AValidator
{
    // Maximum lengths defined by RFC 5322
    private const MAX_LOCAL_PART_LENGTH = 64;
    private const MAX_DOMAIN_LABEL_LENGTH = 63;
    private const MAX_DOMAIN_LENGTH = 255;

    // Character sets for unquoted local part
    private const LOCAL_PART_ALLOWED_CHARS = '!#$%&\'*+-/=?^_`{|}~.';

    /**
     * Validates an email address according to RFC 5322 rules
     *
     * @param EmailAddress $email The email address to validate
     * @return bool True if the email address is valid according to RFC 5322
     */
    public function validate(EmailAddress $email): bool
    {
        $localPart = $email->getLocalPart();
        $domain = $email->getDomain();

        if ($localPart === null || $domain === null) {
            return false;
        }

        return $this->validateLocalPart($localPart) && $this->validateDomain($domain);
    }

    /**
     * Validates the local part of an email address
     *
     * @param string $localPart The local part to validate
     * @return bool True if the local part is valid
     */
    private function validateLocalPart(string $localPart): bool
    {
        // Check length
        if (!$this->validateLocalPartLength($localPart)) {
            return false;
        }

        // Empty local part is invalid
        if ($localPart === '') {
            return false;
        }

        // Handle quoted string
        if ($this->isQuotedString($localPart)) {
            return $this->validateQuotedString($localPart);
        }

        // Handle dot-atom format
        return $this->validateDotAtom($localPart);
    }

    /**
     * Validates the length of a local part
     *
     * @param string $localPart The local part to validate
     * @return bool True if the length is valid
     */
    private function validateLocalPartLength(string $localPart): bool
    {
        return strlen($localPart) <= self::MAX_LOCAL_PART_LENGTH;
    }

    /**
     * Checks if a local part is a quoted string
     *
     * @param string $localPart The local part to check
     * @return bool True if the local part is a quoted string
     */
    private function isQuotedString(string $localPart): bool
    {
        return $localPart[0] === '"';
    }

    /**
     * Validates a dot-atom format local part
     *
     * @param string $localPart The unquoted local part to validate
     * @return bool True if the unquoted local part is valid
     */
    private function validateDotAtom(string $localPart): bool
    {
        // Split into atoms
        $atoms = explode('.', $localPart);

        // Check each atom
        foreach ($atoms as $atom) {
            if (!$this->validateAtom($atom)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Validates a single atom in a dot-atom local part
     *
     * @param string $atom The atom to validate
     * @return bool True if the atom is valid
     */
    private function validateAtom(string $atom): bool
    {
        if ($atom === '') {
            return false;
        }

        // Check for valid characters in each atom
        return (bool)preg_match('/^[a-zA-Z0-9!#$%&\'*+\-\/=?^_`{|}~]+$/', $atom);
    }

    /**
     * Validates a quoted string local part
     *
     * @param string $localPart The quoted string to validate
     * @return bool True if the quoted string is valid
     */
    private function validateQuotedString(string $localPart): bool
    {
        // Must start and end with quotes
        if (!$this->hasValidQuotes($localPart)) {
            return false;
        }

        // Remove outer quotes for content validation
        $content = substr($localPart, 1, -1);

        // Empty quoted strings are valid
        if ($content === '') {
            return true;
        }

        return $this->validateQuotedStringContent($content);
    }

    /**
     * Checks if a quoted string has valid opening and closing quotes
     *
     * @param string $localPart The quoted string to validate
     * @return bool True if the quotes are valid
     */
    private function hasValidQuotes(string $localPart): bool
    {
        return (bool)preg_match('/^".*"$/', $localPart);
    }

    /**
     * Validates the content of a quoted string
     *
     * @param string $content The content to validate (without outer quotes)
     * @return bool True if the content is valid
     */
    private function validateQuotedStringContent(string $content): bool
    {
        $inEscape = false;
        for ($i = 0, $iMax = strlen($content); $i < $iMax; $i++) {
            $char = $content[$i];
            $charCode = ord($char);

            // Non-printable characters are never allowed
            if ($charCode < 32 || $charCode > 126) {
                return false;
            }

            if ($inEscape) {
                // Only quotes and backslashes must be escaped
                // Other characters may be escaped but it's not required
                $inEscape = false;
                continue;
            }

            if ($char === '\\') {
                $inEscape = true;
                continue;
            }

            // Unescaped quotes are not allowed
            if ($char === '"') {
                return false;
            }
        }

        // Can't end with a lone backslash
        return !$inEscape;
    }

    /**
     * Validates the domain part of an email address
     *
     * @param string $domain The domain to validate
     * @return bool True if the domain is valid
     */
    private function validateDomain(string $domain): bool
    {
        // Check for empty domain
        if ($domain === '') {
            return false;
        }

        // Check total length
        if (!$this->validateDomainLength($domain)) {
            return false;
        }

        // Handle domain literal
        if ($this->isDomainLiteral($domain)) {
            return $this->validateDomainLiteral($domain);
        }

        // Validate regular domain
        return $this->validateDomainName($domain);
    }

    /**
     * Validates the length of a domain
     *
     * @param string $domain The domain to validate
     * @return bool True if the length is valid
     */
    private function validateDomainLength(string $domain): bool
    {
        return strlen($domain) <= self::MAX_DOMAIN_LENGTH;
    }

    /**
     * Checks if a domain is a domain literal
     *
     * @param string $domain The domain to check
     * @return bool True if the domain is a domain literal
     */
    private function isDomainLiteral(string $domain): bool
    {
        return $domain[0] === '[';
    }

    /**
     * Validates a domain name
     *
     * @param string $domain The domain name to validate
     * @return bool True if the domain name is valid
     */
    private function validateDomainName(string $domain): bool
    {
        // Split into labels
        $labels = explode('.', $domain);

        // Must have at least two labels
        if (count($labels) < 2) {
            return false;
        }

        // Validate each label
        foreach ($labels as $label) {
            if (!$this->validateDomainLabel($label)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Validates a single domain label
     *
     * @param string $label The domain label to validate
     * @return bool True if the domain label is valid
     */
    private function validateDomainLabel(string $label): bool
    {
        // Check length
        if (!$this->validateDomainLabelLength($label)) {
            return false;
        }

        // Must start and end with alphanumeric
        if (!$this->hasValidLabelBoundaries($label)) {
            return false;
        }

        // Check for valid characters and format
        if (!$this->hasValidLabelFormat($label)) {
            return false;
        }

        // Check for consecutive hyphens
        return !$this->hasConsecutiveHyphens($label);
    }

    /**
     * Validates the length of a domain label
     *
     * @param string $label The domain label to validate
     * @return bool True if the length is valid
     */
    private function validateDomainLabelLength(string $label): bool
    {
        return strlen($label) <= self::MAX_DOMAIN_LABEL_LENGTH && $label !== '';
    }

    /**
     * Checks if a domain label has valid start and end characters
     *
     * @param string $label The domain label to validate
     * @return bool True if the boundaries are valid
     */
    private function hasValidLabelBoundaries(string $label): bool
    {
        return ctype_alnum($label[0]) && ctype_alnum(substr($label, -1));
    }

    /**
     * Checks if a domain label has valid format
     *
     * @param string $label The domain label to validate
     * @return bool True if the format is valid
     */
    private function hasValidLabelFormat(string $label): bool
    {
        return (bool)preg_match('/^[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9]$/', $label);
    }

    /**
     * Checks if a domain label has consecutive hyphens
     *
     * @param string $label The domain label to validate
     * @return bool True if the label has consecutive hyphens
     */
    private function hasConsecutiveHyphens(string $label): bool
    {
        return strpos($label, '--') !== false;
    }

    /**
     * Validates a domain literal (IP address in brackets)
     *
     * @param string $domain The domain literal to validate
     * @return bool True if the domain literal is valid
     */
    private function validateDomainLiteral(string $domain): bool
    {
        // Must be enclosed in brackets
        if (!preg_match('/^\[(.*)]$/', $domain, $matches)) {
            return false;
        }

        $content = $matches[1];

        // Handle IPv6
        if (stripos($content, 'IPv6:') === 0) {
            return $this->validateIPv6($content);
        }

        // Handle IPv4
        return $this->validateIPv4($content);
    }

    /**
     * Validates an IPv6 address
     *
     * @param string $content The IPv6 address to validate (including 'IPv6:' prefix)
     * @return bool True if the IPv6 address is valid
     */
    private function validateIPv6(string $content): bool
    {
        $ipv6 = substr($content, 5);
        // Remove any whitespace
        $ipv6 = trim($ipv6);

        $segments = $this->parseIPv6Segments($ipv6);
        if ($segments === null) {
            return false;
        }

        // Validate each segment
        foreach ($segments as $segment) {
            if (!preg_match('/^[0-9A-Fa-f]{1,4}$/', $segment)) {
                return false;
            }
        }

        // Convert to standard format for final validation
        $ipv6 = implode(':', array_map(function ($segment) {
            return str_pad($segment, 4, '0', STR_PAD_LEFT);
        }, $segments));

        return filter_var($ipv6, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false;
    }

    /**
     * Parses IPv6 address segments, handling compressed notation
     *
     * @param string $ipv6 The IPv6 address to parse
     * @return array|null Array of segments if valid, null if invalid
     */
    private function parseIPv6Segments(string $ipv6): ?array
    {
        // Handle compressed notation
        if (strpos($ipv6, '::') !== false) {
            // Only one :: allowed
            if (substr_count($ipv6, '::') > 1) {
                return null;
            }

            // Split on ::
            $parts = explode('::', $ipv6);
            if (count($parts) !== 2) {
                return null;
            }

            // Count segments on each side
            $leftSegments = $parts[0] ? explode(':', $parts[0]) : [];
            $rightSegments = $parts[1] ? explode(':', $parts[1]) : [];

            // Calculate missing segments
            $totalSegments = count($leftSegments) + count($rightSegments);
            if ($totalSegments >= 8) {
                return null;
            }

            // Fill in missing segments
            $middleSegments = array_fill(0, 8 - $totalSegments, '0');

            // Combine all segments
            return array_merge($leftSegments, $middleSegments, $rightSegments);
        }

        $segments = explode(':', $ipv6);
        return count($segments) === 8 ? $segments : null;
    }

    /**
     * Validates an IPv4 address
     *
     * @param string $content The IPv4 address to validate
     * @return bool True if the IPv4 address is valid
     */
    private function validateIPv4(string $content): bool
    {
        $ipv4 = trim($content);
        $octets = $this->parseIPv4Octets($ipv4);
        if ($octets === null) {
            return false;
        }

        // Convert to standard format for final validation
        $ipv4 = implode('.', array_map(function ($octet) {
            return ltrim($octet, '0') ?: '0';
        }, $octets));

        return filter_var($ipv4, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false;
    }

    /**
     * Parses IPv4 address octets
     *
     * @param string $ipv4 The IPv4 address to parse
     * @return array|null Array of octets if valid, null if invalid
     */
    private function parseIPv4Octets(string $ipv4): ?array
    {
        // Split into octets
        $octets = explode('.', $ipv4);
        if (count($octets) !== 4) {
            return null;
        }

        // Validate each octet
        foreach ($octets as $octet) {
            // Empty octets are invalid
            if ($octet === '') {
                return null;
            }

            // Remove leading zeros
            $octet = ltrim($octet, '0');
            if ($octet === '') {
                $octet = '0';
            }

            // Check numeric value
            if (!is_numeric($octet) || intval($octet) < 0 || intval($octet) > 255) {
                return null;
            }
        }

        return $octets;
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			namespace EmailValidator\Validator;
6
7			use EmailValidator\EmailAddress;
8
9			/**
10			* Validates email addresses according to RFC 5322 standards
11			*
12			* This validator implements strict validation rules from RFC 5322 (superseding RFC 822),
13			* including proper handling of:
14			* - Quoted strings in local part
15			* - Comments
16			* - Domain literals
17			* - Special characters
18			* - Length restrictions
19			*/
20			class Rfc5322Validator extends AValidator
21			{
22			// Maximum lengths defined by RFC 5322
23			private const MAX_LOCAL_PART_LENGTH = 64;
24			private const MAX_DOMAIN_LABEL_LENGTH = 63;
25			private const MAX_DOMAIN_LENGTH = 255;
26
27			// Character sets for unquoted local part
28			private const LOCAL_PART_ALLOWED_CHARS = '!#$%&\'*+-/=?^_`{\|}~.';
29
30			/**
31			* Validates an email address according to RFC 5322 rules
32			*
33			* @param EmailAddress $email The email address to validate
34			* @return bool True if the email address is valid according to RFC 5322
35			*/
36			public function validate(EmailAddress $email): bool
37			{
38			$localPart = $email->getLocalPart();
39			$domain = $email->getDomain();
40
41			if ($localPart === null \|\| $domain === null) {
42			return false;
43			}
44
45			return $this->validateLocalPart($localPart) && $this->validateDomain($domain);
46			}
47
48			/**
49			* Validates the local part of an email address
50			*
51			* @param string $localPart The local part to validate
52			* @return bool True if the local part is valid
53			*/
54			private function validateLocalPart(string $localPart): bool
55			{
56			// Check length
57			if (!$this->validateLocalPartLength($localPart)) {
58			return false;
59			}
60
61			// Empty local part is invalid
62			if ($localPart === '') {
63			return false;
64			}
65
66			// Handle quoted string
67			if ($this->isQuotedString($localPart)) {
68			return $this->validateQuotedString($localPart);
69			}
70
71			// Handle dot-atom format
72			return $this->validateDotAtom($localPart);
73			}
74
75			/**
76			* Validates the length of a local part
77			*
78			* @param string $localPart The local part to validate
79			* @return bool True if the length is valid
80			*/
81			private function validateLocalPartLength(string $localPart): bool
82			{
83			return strlen($localPart) <= self::MAX_LOCAL_PART_LENGTH;
84			}
85
86			/**
87			* Checks if a local part is a quoted string
88			*
89			* @param string $localPart The local part to check
90			* @return bool True if the local part is a quoted string
91			*/
92			private function isQuotedString(string $localPart): bool
93			{
94			return $localPart[0] === '"';
95			}
96
97			/**
98			* Validates a dot-atom format local part
99			*
100			* @param string $localPart The unquoted local part to validate
101			* @return bool True if the unquoted local part is valid
102			*/
103			private function validateDotAtom(string $localPart): bool
104			{
105			// Split into atoms
106			$atoms = explode('.', $localPart);
107
108			// Check each atom
109			foreach ($atoms as $atom) {
110			if (!$this->validateAtom($atom)) {
111			return false;
112			}
113			}
114
115			return true;
116			}
117
118			/**
119			* Validates a single atom in a dot-atom local part
120			*
121			* @param string $atom The atom to validate
122			* @return bool True if the atom is valid
123			*/
124			private function validateAtom(string $atom): bool
125			{
126			if ($atom === '') {
127			return false;
128			}
129
130			// Check for valid characters in each atom
131			return (bool)preg_match('/^[a-zA-Z0-9!#$%&\'*+\-\/=?^_`{\|}~]+$/', $atom);
132			}
133
134			/**
135			* Validates a quoted string local part
136			*
137			* @param string $localPart The quoted string to validate
138			* @return bool True if the quoted string is valid
139			*/
140			private function validateQuotedString(string $localPart): bool
141			{
142			// Must start and end with quotes
143			if (!$this->hasValidQuotes($localPart)) {
144			return false;
145			}
146
147			// Remove outer quotes for content validation
148			$content = substr($localPart, 1, -1);
149
150			// Empty quoted strings are valid
151			if ($content === '') {
152			return true;
153			}
154
155			return $this->validateQuotedStringContent($content);
156			}
157
158			/**
159			* Checks if a quoted string has valid opening and closing quotes
160			*
161			* @param string $localPart The quoted string to validate
162			* @return bool True if the quotes are valid
163			*/
164			private function hasValidQuotes(string $localPart): bool
165			{
166			return (bool)preg_match('/^".*"$/', $localPart);
167			}
168
169			/**
170			* Validates the content of a quoted string
171			*
172			* @param string $content The content to validate (without outer quotes)
173			* @return bool True if the content is valid
174			*/
175			private function validateQuotedStringContent(string $content): bool
176			{
177			$inEscape = false;
178			for ($i = 0, $iMax = strlen($content); $i < $iMax; $i++) {
179			$char = $content[$i];
180			$charCode = ord($char);
181
182			// Non-printable characters are never allowed
183			if ($charCode < 32 \|\| $charCode > 126) {
184			return false;
185			}
186
187			if ($inEscape) {
188			// Only quotes and backslashes must be escaped
189			// Other characters may be escaped but it's not required
190			$inEscape = false;
191			continue;
192			}
193
194			if ($char === '\\') {
195			$inEscape = true;
196			continue;
197			}
198
199			// Unescaped quotes are not allowed
200			if ($char === '"') {
201			return false;
202			}
203			}
204
205			// Can't end with a lone backslash
206			return !$inEscape;
207			}
208
209			/**
210			* Validates the domain part of an email address
211			*
212			* @param string $domain The domain to validate
213			* @return bool True if the domain is valid
214			*/
215			private function validateDomain(string $domain): bool
216			{
217			// Check for empty domain
218			if ($domain === '') {
219			return false;
220			}
221
222			// Check total length
223			if (!$this->validateDomainLength($domain)) {
224			return false;
225			}
226
227			// Handle domain literal
228			if ($this->isDomainLiteral($domain)) {
229			return $this->validateDomainLiteral($domain);
230			}
231
232			// Validate regular domain
233			return $this->validateDomainName($domain);
234			}
235
236			/**
237			* Validates the length of a domain
238			*
239			* @param string $domain The domain to validate
240			* @return bool True if the length is valid
241			*/
242			private function validateDomainLength(string $domain): bool
243			{
244			return strlen($domain) <= self::MAX_DOMAIN_LENGTH;
245			}
246
247			/**
248			* Checks if a domain is a domain literal
249			*
250			* @param string $domain The domain to check
251			* @return bool True if the domain is a domain literal
252			*/
253			private function isDomainLiteral(string $domain): bool
254			{
255			return $domain[0] === '[';
256			}
257
258			/**
259			* Validates a domain name
260			*
261			* @param string $domain The domain name to validate
262			* @return bool True if the domain name is valid
263			*/
264			private function validateDomainName(string $domain): bool
265			{
266			// Split into labels
267			$labels = explode('.', $domain);
268
269			// Must have at least two labels
270			if (count($labels) < 2) {
271			return false;
272			}
273
274			// Validate each label
275			foreach ($labels as $label) {
276			if (!$this->validateDomainLabel($label)) {
277			return false;
278			}
279			}
280
281			return true;
282			}
283
284			/**
285			* Validates a single domain label
286			*
287			* @param string $label The domain label to validate
288			* @return bool True if the domain label is valid
289			*/
290			private function validateDomainLabel(string $label): bool
291			{
292			// Check length
293			if (!$this->validateDomainLabelLength($label)) {
294			return false;
295			}
296
297			// Must start and end with alphanumeric
298			if (!$this->hasValidLabelBoundaries($label)) {
299			return false;
300			}
301
302			// Check for valid characters and format
303			if (!$this->hasValidLabelFormat($label)) {
304			return false;
305			}
306
307			// Check for consecutive hyphens
308			return !$this->hasConsecutiveHyphens($label);
309			}
310
311			/**
312			* Validates the length of a domain label
313			*
314			* @param string $label The domain label to validate
315			* @return bool True if the length is valid
316			*/
317			private function validateDomainLabelLength(string $label): bool
318			{
319			return strlen($label) <= self::MAX_DOMAIN_LABEL_LENGTH && $label !== '';
320			}
321
322			/**
323			* Checks if a domain label has valid start and end characters
324			*
325			* @param string $label The domain label to validate
326			* @return bool True if the boundaries are valid
327			*/
328			private function hasValidLabelBoundaries(string $label): bool
329			{
330			return ctype_alnum($label[0]) && ctype_alnum(substr($label, -1));
331			}
332
333			/**
334			* Checks if a domain label has valid format
335			*
336			* @param string $label The domain label to validate
337			* @return bool True if the format is valid
338			*/
339			private function hasValidLabelFormat(string $label): bool
340			{
341			return (bool)preg_match('/^[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9]$/', $label);
342			}
343
344			/**
345			* Checks if a domain label has consecutive hyphens
346			*
347			* @param string $label The domain label to validate
348			* @return bool True if the label has consecutive hyphens
349			*/
350			private function hasConsecutiveHyphens(string $label): bool
351			{
352			return strpos($label, '--') !== false;
353			}
354
355			/**
356			* Validates a domain literal (IP address in brackets)
357			*
358			* @param string $domain The domain literal to validate
359			* @return bool True if the domain literal is valid
360			*/
361			private function validateDomainLiteral(string $domain): bool
362			{
363			// Must be enclosed in brackets
364			if (!preg_match('/^\[(.*)]$/', $domain, $matches)) {
365			return false;
366			}
367
368			$content = $matches[1];
369
370			// Handle IPv6
371			if (stripos($content, 'IPv6:') === 0) {
372			return $this->validateIPv6($content);
373			}
374
375			// Handle IPv4
376			return $this->validateIPv4($content);
377			}
378
379			/**
380			* Validates an IPv6 address
381			*
382			* @param string $content The IPv6 address to validate (including 'IPv6:' prefix)
383			* @return bool True if the IPv6 address is valid
384			*/
385			private function validateIPv6(string $content): bool
386			{
387			$ipv6 = substr($content, 5);
388			// Remove any whitespace
389			$ipv6 = trim($ipv6);
390
391			$segments = $this->parseIPv6Segments($ipv6);
392			if ($segments === null) {
393			return false;
394			}
395
396			// Validate each segment
397			foreach ($segments as $segment) {
398			if (!preg_match('/^[0-9A-Fa-f]{1,4}$/', $segment)) {
399			return false;
400			}
401			}
402
403			// Convert to standard format for final validation
404			$ipv6 = implode(':', array_map(function ($segment) {
405			return str_pad($segment, 4, '0', STR_PAD_LEFT);
406			}, $segments));
407
408			return filter_var($ipv6, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false;
409			}
410
411			/**
412			* Parses IPv6 address segments, handling compressed notation
413			*
414			* @param string $ipv6 The IPv6 address to parse
415			* @return array\|null Array of segments if valid, null if invalid
416			*/
417			private function parseIPv6Segments(string $ipv6): ?array
418			{
419			// Handle compressed notation
420			if (strpos($ipv6, '::') !== false) {
421			// Only one :: allowed
422			if (substr_count($ipv6, '::') > 1) {
423			return null;
424			}
425
426			// Split on ::
427			$parts = explode('::', $ipv6);
428			if (count($parts) !== 2) {
429			return null;
430			}
431
432			// Count segments on each side
433			$leftSegments = $parts[0] ? explode(':', $parts[0]) : [];
434			$rightSegments = $parts[1] ? explode(':', $parts[1]) : [];
435
436			// Calculate missing segments
437			$totalSegments = count($leftSegments) + count($rightSegments);
438			if ($totalSegments >= 8) {
439			return null;
440			}
441
442			// Fill in missing segments
443			$middleSegments = array_fill(0, 8 - $totalSegments, '0');
444
445			// Combine all segments
446			return array_merge($leftSegments, $middleSegments, $rightSegments);
447			}
448
449			$segments = explode(':', $ipv6);
450			return count($segments) === 8 ? $segments : null;
451			}
452
453			/**
454			* Validates an IPv4 address
455			*
456			* @param string $content The IPv4 address to validate
457			* @return bool True if the IPv4 address is valid
458			*/
459			private function validateIPv4(string $content): bool
460			{
461			$ipv4 = trim($content);
462			$octets = $this->parseIPv4Octets($ipv4);
463			if ($octets === null) {
464			return false;
465			}
466
467			// Convert to standard format for final validation
468			$ipv4 = implode('.', array_map(function ($octet) {
469			return ltrim($octet, '0') ?: '0';
470			}, $octets));
471
472			return filter_var($ipv4, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false;
473			}
474
475			/**
476			* Parses IPv4 address octets
477			*
478			* @param string $ipv4 The IPv4 address to parse
479			* @return array\|null Array of octets if valid, null if invalid
480			*/
481			private function parseIPv4Octets(string $ipv4): ?array
482			{
483			// Split into octets
484			$octets = explode('.', $ipv4);
485			if (count($octets) !== 4) {
486			return null;
487			}
488
489			// Validate each octet
490			foreach ($octets as $octet) {
491			// Empty octets are invalid
492			if ($octet === '') {
493			return null;
494			}
495
496			// Remove leading zeros
497			$octet = ltrim($octet, '0');
498			if ($octet === '') {
499			$octet = '0';
500			}
501
502			// Check numeric value
503			if (!is_numeric($octet) \|\| intval($octet) < 0 \|\| intval($octet) > 255) {
504			return null;
505			}
506			}
507
508			return $octets;
509			}
510			}
511

stymiee / email-validator

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Rfc5322Validator::validateQuotedStringContent() B

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