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<?php |
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declare(strict_types=1); |
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namespace EmailValidator\Validator\Domain; |
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/** |
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* Validates domain names according to RFC 5322 standards |
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*/ |
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class DomainNameValidator |
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{ |
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private const MAX_DOMAIN_LABEL_LENGTH = 63; |
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private const MAX_DOMAIN_LENGTH = 255; |
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/** |
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* Validates a domain name |
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* |
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* @param string $domain The domain name to validate |
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* @return bool True if the domain name is valid |
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*/ |
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public function validate(string $domain): bool |
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{ |
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// Check for empty domain |
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if ($domain === '') { |
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return false; |
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} |
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// Check total length |
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if (!$this->validateLength($domain)) { |
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return false; |
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} |
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// Split into labels |
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$labels = explode('.', $domain); |
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// Must have at least two labels |
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if (count($labels) < 2) { |
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return false; |
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} |
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// Validate each label |
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foreach ($labels as $label) { |
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if (!$this->validateLabel($label)) { |
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return false; |
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} |
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} |
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return true; |
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} |
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/** |
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* Validates the length of a domain |
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* |
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* @param string $domain The domain to validate |
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* @return bool True if the length is valid |
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*/ |
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private function validateLength(string $domain): bool |
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{ |
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return strlen($domain) <= self::MAX_DOMAIN_LENGTH; |
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} |
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/** |
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* Validates a single domain label |
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* |
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* @param string $label The domain label to validate |
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* @return bool True if the domain label is valid |
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*/ |
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private function validateLabel(string $label): bool |
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{ |
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// Check length |
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if (!$this->validateLabelLength($label)) { |
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return false; |
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} |
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// Handle IDN labels (starting with 'xn--') |
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if (substr($label, 0, 4) === 'xn--') { |
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return $this->validateIDNLabel($label); |
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} |
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// Single character labels are allowed if they're alphanumeric |
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if (strlen($label) === 1) { |
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return ctype_alnum($label); |
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} |
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// Must start and end with alphanumeric |
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if (!$this->hasValidLabelBoundaries($label)) { |
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return false; |
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} |
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// Check for valid characters and format |
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if (!$this->hasValidLabelFormat($label)) { |
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return false; |
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} |
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// Check for consecutive hyphens |
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return !$this->hasConsecutiveHyphens($label); |
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} |
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/** |
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* Validates the length of a domain label |
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* |
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* @param string $label The domain label to validate |
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* @return bool True if the length is valid |
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*/ |
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private function validateLabelLength(string $label): bool |
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{ |
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return strlen($label) <= self::MAX_DOMAIN_LABEL_LENGTH && $label !== ''; |
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} |
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/** |
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* Validates an IDN (Internationalized Domain Name) label |
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* |
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* @param string $label The IDN label to validate |
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* @return bool True if the IDN label is valid |
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*/ |
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private function validateIDNLabel(string $label): bool |
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{ |
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// Must be at least 5 characters (xn-- plus at least one character) |
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if (strlen($label) < 5) { |
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return false; |
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} |
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// Rest of the label must be alphanumeric or hyphen |
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$rest = substr($label, 4); |
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return (bool)preg_match('/^[a-zA-Z0-9-]+$/', $rest); |
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} |
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/** |
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* Checks if a domain label has valid start and end characters |
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* |
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* @param string $label The domain label to validate |
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* @return bool True if the boundaries are valid |
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*/ |
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private function hasValidLabelBoundaries(string $label): bool |
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{ |
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return ctype_alnum($label[0]) && ctype_alnum(substr($label, -1)); |
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} |
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/** |
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* Checks if a domain label has valid format |
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* |
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* @param string $label The domain label to validate |
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* @return bool True if the format is valid |
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*/ |
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private function hasValidLabelFormat(string $label): bool |
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{ |
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return (bool)preg_match('/^[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9]$/', $label); |
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} |
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/** |
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* Checks if a domain label has consecutive hyphens |
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* |
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* @param string $label The domain label to validate |
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* @return bool True if the label has consecutive hyphens |
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*/ |
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private function hasConsecutiveHyphens(string $label): bool |
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{ |
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return strpos($label, '--') !== false; |
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} |
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} |
stymiee /
email-validator
