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<?php |
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declare(strict_types=1); |
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namespace PasswordHelper; |
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/** |
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* Validates passwords against a set of policy requirements. |
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* |
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* This class provides methods to check if passwords meet various security |
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* requirements such as minimum length, character types, and complexity rules. |
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* |
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* @package PasswordHelper |
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*/ |
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class Validator |
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{ |
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/** |
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* Creates a new password validator. |
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*/ |
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public function __construct( |
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private Policy $policy |
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) { |
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} |
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/** |
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* Validates a password against the policy requirements. |
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* |
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* @param string $password The password to validate |
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* @return bool True if the password meets all requirements |
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*/ |
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public function isValidPassword(string $password): bool |
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{ |
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return $this->meetsLengthRequirement($password) && |
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$this->meetsCharacterTypeRequirements($password) && |
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$this->meetsComplexityRequirements($password); |
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} |
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/** |
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* Checks if the password meets the length requirements. |
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* |
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* @param string $password The password to check |
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* @return bool True if the length requirements are met |
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*/ |
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private function meetsLengthRequirement(string $password): bool |
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{ |
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$length = strlen($password); |
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return $length >= $this->policy->getMinimumLength() && |
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$length <= $this->policy->getMaximumLength(); |
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} |
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/** |
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* Checks if the password meets the character type requirements. |
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* |
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* @param string $password The password to check |
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* @return bool True if the character type requirements are met |
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*/ |
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private function meetsCharacterTypeRequirements(string $password): bool |
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{ |
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return $this->countCharacterTypes($password) >= $this->policy->getMinimumCharacterTypes(); |
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} |
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/** |
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* Counts the number of different character types in the password. |
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* |
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* @param string $password The password to check |
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* @return int The number of different character types |
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*/ |
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private function countCharacterTypes(string $password): int |
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{ |
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$types = 0; |
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if (preg_match('/[A-Z]/', $password)) { |
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$types++; |
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} |
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if (preg_match('/[a-z]/', $password)) { |
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$types++; |
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} |
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if (preg_match('/\d/', $password)) { |
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$types++; |
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} |
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if (preg_match('/[^a-zA-Z\d]/', $password)) { |
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$types++; |
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} |
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return $types; |
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} |
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/** |
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* Checks if the password meets the complexity requirements. |
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* |
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* @param string $password The password to check |
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* @return bool True if the complexity requirements are met |
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*/ |
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private function meetsComplexityRequirements(string $password): bool |
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{ |
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return !$this->hasRepeatedCharacters($password) && |
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!$this->hasSequentialCharacters($password) && |
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!$this->hasCommonPatterns($password); |
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} |
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/** |
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* Checks if the password contains repeated characters. |
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* |
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* @param string $password The password to check |
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* @return bool True if repeated characters are found |
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*/ |
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private function hasRepeatedCharacters(string $password): bool |
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{ |
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return (bool) preg_match('/(.)\1{2,}/', $password); |
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} |
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/** |
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* Checks if the password contains sequential characters. |
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* |
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* @param string $password The password to check |
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* @return bool True if sequential characters are found |
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*/ |
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private function hasSequentialCharacters(string $password): bool |
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{ |
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return $this->hasSequentialNumbers($password) || |
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$this->hasSequentialLetters($password) || |
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$this->hasKeyboardPattern($password); |
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} |
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/** |
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* Checks if the password contains sequential numbers. |
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* |
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* @param string $password The password to check |
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* @return bool True if sequential numbers are found |
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*/ |
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private function hasSequentialNumbers(string $password): bool |
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{ |
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return (bool) preg_match('/012|123|234|345|456|567|678|789/', $password); |
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} |
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/** |
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* Checks if the password contains sequential letters. |
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* |
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* @param string $password The password to check |
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* @return bool True if sequential letters are found |
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*/ |
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private function hasSequentialLetters(string $password): bool |
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{ |
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return (bool) preg_match('/abc|bcd|cde|def|efg|fgh|ghi|hij|ijk|jkl|klm|lmn|mno|nop|opq|pqr|qrs|rst|stu|tuv|uvw|vwx|wxy|xyz/i', $password); |
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} |
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/** |
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* Checks if the password contains keyboard patterns. |
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* |
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* @param string $password The password to check |
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* @return bool True if keyboard patterns are found |
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*/ |
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private function hasKeyboardPattern(string $password): bool |
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{ |
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return (bool) preg_match('/qwer|wert|erty|rtyu|tyui|yuio|uiop|asdf|sdfg|dfgh|fghj|ghjk|hjkl|zxcv|xcvb|cvbn|vbnm/i', $password); |
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} |
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/** |
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* Checks if the password contains common patterns. |
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* |
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* @param string $password The password to check |
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* @return bool True if common patterns are found |
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*/ |
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private function hasCommonPatterns(string $password): bool |
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{ |
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$commonPatterns = [ |
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'123456', 'password', 'qwerty', 'admin', 'welcome', |
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'monkey', 'letmein', 'dragon', 'baseball', 'iloveyou', |
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'trustno1', 'sunshine', 'master', 'hello', 'shadow', |
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'ashley', 'football', 'jesus', 'michael', 'ninja', |
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'mustang', 'password1', '12345678', 'qwerty123', 'admin123' |
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]; |
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$password = strtolower($password); |
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foreach ($commonPatterns as $pattern) { |
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if (str_contains($password, $pattern)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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} |
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stymiee /
password-helper
