<?php //phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
/**
 * The password strength checker.
 *
 * @package automattic/jetpack
 */

/**
 * Checks passwords strength.
 */
class Jetpack_Password_Checker {

	/**
	 * Minimum entropy bits a password should contain. 36 bits of entropy is considered
	 * to be a reasonable password, 28 stands for a weak one.
	 *
	 * @const Integer
	 */
	const MINIMUM_BITS = 28;

	/**
	 * Currently tested password.
	 *
	 * @var String
	 */
	public $password = '';

	/**
	 * Test results array.
	 *
	 * @var Array
	 */
	public $test_results = '';

	/**
	 * Current password score.
	 *
	 * @var Integer
	 */
	public $score = 0;

	/**
	 * Current multiplier affecting the score.
	 *
	 * @var Integer
	 */
	public $multiplier = 4;

	/**
	 * A common password disallow list, which on match will immediately disqualify the password.
	 *
	 * @var Array
	 */
	public $common_passwords = array();

	/**
	 * Minimum password length setting.
	 *
	 * @var Integer
	 */
	public $min_password_length = 6;

	/**
	 * User defined strings that passwords need to be tested for a match against.
	 *
	 * @var Array
	 */
	private $user_strings_to_test = array();

	/**
	 * The user object for whom the password is being tested.
	 *
	 * @var WP_User
	 */
	protected $user;

	/**
	 * The user identifier for whom the password is being tested, used if there's no user object.
	 *
	 * @var WP_User
	 */
	protected $user_id;

	/**
	 * Creates an instance of the password checker class for the specified user, or
	 * defaults to the currently logged in user.
	 *
	 * @param Mixed $user can be an integer ID, or a WP_User object.
	 */
	public function __construct( $user = null ) {

		/**
		 * Filters Jetpack's password strength enforcement settings. You can supply your own passwords
		 * that should not be used for authenticating in addition to weak and easy to guess strings for
		 * each user. For example, you can add passwords from known password databases to avoid compromised
		 * password usage.
		 *
		 * @since 7.2.0
		 *
		 * @param array $restricted_passwords strings that are forbidden for use as passwords.
		 */
		$this->common_passwords = apply_filters( 'jetpack_password_checker_restricted_strings', array() );

		if ( $user === null ) {
			$this->user_id = get_current_user_id();
		} elseif ( is_object( $user ) && isset( $user->ID ) ) {

			// Existing user, using their ID.
			$this->user_id = $user->ID;

		} elseif ( is_object( $user ) ) {

			// Newly created user, using existing data.
			$this->user    = $user;
			$this->user_id = 'new_user';

		} else {
			$this->user_id = $user;
		}
		$this->min_password_length = apply_filters( 'better_password_min_length', $this->min_password_length );
	}

	/**
	 * Run tests against a password.
	 *
	 * @param String  $password      the tested string.
	 * @param Boolean $required_only only test against required conditions, defaults to false.
	 * @return array $results an array containing failed and passed test results.
	 */
	public function test( $password, $required_only = false ) {

		$this->password = $password;
		$results        = $this->run_tests( $this->list_tests(), $required_only );

		// If we've failed on the required tests, return now.
		if ( ! empty( $results['failed'] ) ) {
			return array(
				'passed'       => false,
				'test_results' => $results,
			);
		}

		/**
		 * Filters Jetpack's password strength enforcement settings. You can modify the minimum
		 * entropy bits requirement using this filter.
		 *
		 * @since 7.2.0
		 *
		 * @param array $minimum_entropy_bits minimum entropy bits requirement.
		 */
		$bits         = apply_filters( 'jetpack_password_checker_minimum_entropy_bits', self::MINIMUM_BITS );
		$entropy_bits = $this->calculate_entropy_bits( $this->password );

		// If we have failed the entropy bits test, run the regex tests so we can suggest improvements.
		if ( $entropy_bits < $bits ) {
			$results['failed']['entropy_bits'] = $entropy_bits;
			$results                           = array_merge(
				$results,
				$this->run_tests( $this->list_tests( 'preg_match' ), false )
			);
		}

		return( array(
			'passed'       => empty( $results['failed'] ),
			'test_results' => $results,
		) );
	}

	/**
	 * Run the tests using the currently set up object values.
	 *
	 * @param array   $tests tests to run.
	 * @param Boolean $required_only whether to run only required tests.
	 * @return array test results.
	 */
	protected function run_tests( $tests, $required_only = false ) {

		$results = array(
			'passed' => array(),
			'failed' => array(),
		);

		foreach ( $tests as $test_type => $section_tests ) {
			foreach ( $section_tests as $test_name => $test_data ) {

				// Skip non-required tests if required_only param is set.
				if ( $required_only && ! $test_data['required'] ) {
					continue;
				}

				$test_function = 'test_' . $test_type;

				$result = call_user_func( array( $this, $test_function ), $test_data );

				if ( $result ) {
					$results['passed'][] = array( 'test_name' => $test_name );
				} else {
					$results['failed'][] = array(
						'test_name'   => $test_name,
						'explanation' => $test_data['error'],
					);

					if ( isset( $test_data['fail_immediately'] ) ) {
						return $results;
					}
				}
			}
		}

		return $results;
	}

	/**
	 * Returns a list of tests that need to be run on password strings.
	 *
	 * @param array $sections only return specific sections with the passed keys, defaults to all.
	 * @return array test descriptions.
	 */
	protected function list_tests( $sections = false ) {
		// Note: these should be in order of priority.
		$tests = array(
			'preg_match'      => array(
				'no_backslashes'   => array(
					'pattern'          => '^[^\\\\]*$',
					'error'            => __( 'Passwords may not contain the character "\".', 'jetpack' ),
					'required'         => true,
					'fail_immediately' => true,
				),
				'minimum_length'   => array(
					'pattern'          => '^.{' . $this->min_password_length . ',}',
					/* translators: %d is a number of characters in the password. */
					'error'            => sprintf( __( 'Password must be at least %d characters.', 'jetpack' ), $this->min_password_length ),
					'required'         => true,
					'fail_immediately' => true,
				),
				'has_mixed_case'   => array(
					'pattern'  => '([a-z].*?[A-Z]|[A-Z].*?[a-z])',
					'error'    => __( 'This password is too easy to guess: you can improve it by adding additional uppercase letters, lowercase letters, or numbers.', 'jetpack' ),
					'trim'     => true,
					'required' => false,
				),
				'has_digit'        => array(
					'pattern'  => '\d',
					'error'    => __( 'This password is too easy to guess: you can improve it by mixing both letters and numbers.', 'jetpack' ),
					'trim'     => false,
					'required' => false,
				),
				'has_special_char' => array(
					'pattern'  => '[^a-zA-Z\d]',
					'error'    => __( 'This password is too easy to guess: you can improve it by including special characters such as !#=?*&.', 'jetpack' ),
					'required' => false,
				),
			),
			'compare_to_list' => array(
				'not_a_common_password'       => array(
					'list_callback'    => 'get_common_passwords',
					'compare_callback' => 'negative_in_array',
					'error'            => __( 'This is a very common password. Choose something that will be harder for others to guess.', 'jetpack' ),
					'required'         => true,
				),
				'not_same_as_other_user_data' => array(
					'list_callback'    => 'get_other_user_data',
					'compare_callback' => 'test_not_same_as_other_user_data',
					'error'            => __( 'Your password is too weak: Looks like you\'re including easy to guess information about yourself. Try something a little more unique.', 'jetpack' ),
					'required'         => true,
				),
			),
		);

		/**
		 * Filters Jetpack's password strength enforcement settings. You can determine the tests run
		 * and their order based on whatever criteria you wish to specify.
		 *
		 * @since 7.2.0
		 *
		 * @param array $minimum_entropy_bits minimum entropy bits requirement.
		 */
		$tests = apply_filters( 'jetpack_password_checker_tests', $tests );

		if ( ! $sections ) {
			return $tests;
		}

		$sections = (array) $sections;
		return array_intersect_key( $tests, array_flip( $sections ) );
	}

	/**
	 * Provides the regular expression tester functionality.
	 *
	 * @param array $test_data the current test data.
	 * @return Boolean does the test pass?
	 */
	protected function test_preg_match( $test_data ) {
		$password = stripslashes( $this->password );

		if ( isset( $test_data['trim'] ) ) {
			$password = substr( $password, 1, -1 );
		}

		if ( ! preg_match( '/' . $test_data['pattern'] . '/u', $password ) ) {
			return false;
		}

		return true;
	}

	/**
	 * Provides the comparison tester functionality.
	 *
	 * @param array $test_data the current test data.
	 * @return Boolean does the test pass?
	 */
	protected function test_compare_to_list( $test_data ) {
		$list_callback    = $test_data['list_callback'];
		$compare_callback = $test_data['compare_callback'];

		if (
			! is_callable( array( $this, $list_callback ) )
			|| ! is_callable( array( $this, $compare_callback ) )
		) {
			return false;
		}

		$list = call_user_func( array( $this, $list_callback ) );
		if ( empty( $list ) ) {
			return true;
		}

		return call_user_func( array( $this, $compare_callback ), $this->password, $list );
	}

	/**
	 * Getter for the common password list.
	 *
	 * @return array common passwords.
	 */
	protected function get_common_passwords() {
		return $this->common_passwords;
	}

	/**
	 * Returns the widely known user data that can not be used in the password to avoid
	 * predictable strings.
	 *
	 * @return array user data.
	 */
	protected function get_other_user_data() {

		if ( ! isset( $this->user ) ) {
			$user_data = get_userdata( $this->user_id );

			$first_name = get_user_meta( $user_data->ID, 'first_name', true );
			$last_name  = get_user_meta( $user_data->ID, 'last_name', true );
			$nickname   = get_user_meta( $user_data->ID, 'nickname', true );

			$this->add_user_strings_to_test( $nickname );
			$this->add_user_strings_to_test( $user_data->user_nicename );
			$this->add_user_strings_to_test( $user_data->display_name );
		} else {
			$user_data = $this->user;

			$first_name = $user_data->first_name;
			$last_name  = $user_data->last_name;
		}
		$email_username = substr( $user_data->user_email, 0, strpos( $user_data->user_email, '@' ) );

		$this->add_user_strings_to_test( $user_data->user_email );
		$this->add_user_strings_to_test( $email_username, '.' );
		$this->add_user_strings_to_test( $first_name );
		$this->add_user_strings_to_test( $last_name );

		return $this->user_strings_to_test;
	}

	/**
	 * Compare the password for matches with known user data.
	 *
	 * @param String $password the string to be tested.
	 * @param array  $strings_to_test known user data.
	 * @return Boolean does the test pass?
	 */
	protected function test_not_same_as_other_user_data( $password, $strings_to_test ) {
		$password_lowercase = strtolower( $password );
		foreach ( array_unique( $strings_to_test ) as $string ) {
			if ( empty( $string ) ) {
				continue;
			}

			$string          = strtolower( $string );
			$string_reversed = strrev( $string );

			if ( $password_lowercase === $string || $password_lowercase === $string_reversed ) {
				return false;
			}

			// Also check for the string or reversed string with any numbers just stuck to the end to catch things like bob123 as passwords.
			if (
				preg_match( '/^' . preg_quote( $string, '/' ) . '\d+$/', $password_lowercase )
				|| preg_match( '/^' . preg_quote( $string_reversed, '/' ) . '\d+$/', $password_lowercase )
			) {
				return false;
			}
		}
		return true;
	}

	/**
	 * A shorthand for the not in array construct.
	 *
	 * @param Mixed $needle the needle.
	 * @param array $haystack the haystack.
	 * @return is the needle not in the haystack?
	 */
	protected function negative_in_array( $needle, $haystack ) {
		if ( in_array( $needle, $haystack, true ) ) {
			return false;
		}

		return true;
	}

	/**
	 * A helper function used to break a single string into its constituents so
	 * that both the full string and its constituents and any variants thereof
	 * can be tested against the password.
	 *
	 * @param String $string the string to be broken down.
	 * @param String $explode_delimiter delimiter.
	 * @return NULL|Array array of fragments, or NULL on empty string.
	 */
	protected function add_user_strings_to_test( $string, $explode_delimiter = ' ' ) {

		// Don't check against empty strings.
		if ( empty( $string ) ) {
			return;
		}

		$strings = explode( $explode_delimiter, $string );

		// Remove any non alpha numeric characters from the strings to check against.
		foreach ( $strings as $key => $_string ) {
			$strings[ $key ] = preg_replace( '/[^a-zA-Z0-9]/', '', $_string );
		}

		// Check the original too.
		$strings[] = $string;

		// Check the original minus non alpha numeric characters.
		$strings[] = preg_replace( '/[^a-zA-Z0-9]/', '', $string );

		// Remove any empty strings.
		$strings                    = array_filter( $strings );
		$this->user_strings_to_test = array_merge( $this->user_strings_to_test, $strings );
	}

	/**
	 * Return a character set size that is used in the string.
	 *
	 * @param String $password the password.
	 * @return Integer number of different character sets in use.
	 */
	protected function get_charset_size( $password ) {
		$size = 0;

		// Lowercase a-z.
		if ( preg_match( '/[a-z]/', $password ) ) {
			$size += 26;
		}

		// Uppercase A-Z.
		if ( preg_match( '/[A-Z]/', substr( $password, 1, -1 ) ) ) {
			$size += 26;
		}

		// Digits.
		if ( preg_match( '/\d/', substr( $password, 1, -1 ) ) ) {
			$size += 10;
		}

		// Over digits symbols.
		if ( preg_match( '/[!|@|#|$|%|^|&|*|(|)]/', $password ) ) {
			$size += 10;
		}

		// Other symbols.
		if ( preg_match( '#[`|~|-|_|=|+|\[|{|\]|}|\\|\|;:\'",<\.>/\?]#', $password ) ) {
			$size += 20;
		}

		// Spaces.
		if ( strpos( $password, ' ' ) ) {
			++$size;
		}

		return $size;
	}

	/**
	 * Shorthand for getting a character index.
	 *
	 * @param String $char character.
	 * @return Integer the character code.
	 */
	protected function get_char_index( $char ) {
		$char = strtolower( $char[0] );
		if ( $char < 'a' || $char > 'z' ) {
			return 0;
		} else {
			return ord( $char[0] ) - ord( 'a' ) + 1;
		}
	}

	/**
	 * This is the password strength calculation algorithm, based on the formula H = L(logN/log2).
	 *
	 * H = Entropy
	 * L = String length (the for iterator)
	 * N = Our charset size, via get_charset_size()
	 *
	 * @see https://en.wikipedia.org/wiki/Password_strength#Random_passwords
	 *
	 * On top of the base formula, we're also multiplying the bits of entropy for every char
	 * by 1 - (the probabily of it following the previous char)
	 * i.e.: the probablity of U following Q is ~0.84. If our password contains this pair of characters,
	 * the u char will only add ( 0.16^2 * charset_score ) to our total of entropy bits.
	 *
	 * @param String $password the password.
	 */
	protected function calculate_entropy_bits( $password ) {
		$bits          = 0;
		$charset_score = log( $this->get_charset_size( $password ) ) / log( 2 );

		$aidx   = $this->get_char_index( $password[0] );
		$length = strlen( $password );

		for ( $b = 1; $b < $length; $b++ ) {
			$bidx = $this->get_char_index( $password[ $b ] );

			// 27 = number of chars in the index (a-z,' ').
			$c     = 1.0 - $this->frequency_table[ $aidx * 27 + $bidx ];
			$bits += $charset_score * $c * $c;

			// Move on to next pair.
			$aidx = $bidx;
		}

		return $bits;
	}

	/**
	 * A frequency table of character pairs, starting with  '  ' then  ' a', ' b' [...] , 'a ', 'aa' etc.
	 *
	 * @see http://rumkin.com/tools/password/passchk.php
	 * @var Array
	 */
	public $frequency_table = array(
		0.23653710453418866,
		0.04577693541332556,
		0.03449832337075375,
		0.042918209651552706,
		0.037390873305146524,
		0.028509112115468728,
		0.02350896632162123,
		0.022188657238664526,
		0.028429800262428927,
		0.04357019973757107,
		0.00913602565971716,
		0.03223093745443942,
		0.02235311269864412,
		0.04438081352966905,
		0.04512377897652719,
		0.020055401662049863,
		0.055903192885260244,
		0.0024388394809739026,
		0.035207464644991984,
		0.07355941099285611,
		0.036905671380667734,
		0.026134421927394666,
		0.023787724158040528,
		0.011352092141711621,
		0.0032354570637119114,
		0.005986878553725033,
		0.008861933226417843,
		0.11511532293337222,
		0.027556203528211108,
		0.024331243621519172,
		0.039266365359381834,
		0.031599941682461,
		0.014403265782183991,
		0.015480973902901297,
		0.027770812071730572,
		0.00942761335471643,
		0.039872867764980315,
		0.0078122175244204695,
		0.02808456043154979,
		0.08429100451960927,
		0.04688963405744277,
		0.13831170724595424,
		0.002540311998833649,
		0.025211838460416972,
		0.001543082081936142,
		0.09519638431258201,
		0.061845750109345385,
		0.08907071001603732,
		0.02137571074500656,
		0.027093162268552268,
		0.005521504592506197,
		0.003023181221752442,
		0.007086747339262283,
		0.010262720513194342,
		0.08785070710016038,
		0.14617757690625455,
		0.03417291150313457,
		0.0059635515381250915,
		0.006146668610584633,
		0.195202799241872,
		0.002774748505613063,
		0.004715556203528212,
		0.0044776206444088066,
		0.11205481848665985,
		0.005654468581425864,
		0.0028820527773727946,
		0.07383000437381543,
		0.005516839189386207,
		0.006496573844583759,
		0.09843067502551392,
		0.0027140982650532145,
		0.0006893133109782768,
		0.08425368129464937,
		0.021325557661466685,
		0.006493074792243767,
		0.07023414491908442,
		0.002077270739174807,
		0.0024633328473538415,
		0.0007744569179180639,
		0.015413325557661468,
		0.0011990086018370024,
		0.13162851727657093,
		0.10115993585070711,
		0.0026989357049132527,
		0.03319317684793702,
		0.002946202070272634,
		0.0783216212275842,
		0.0018358361277154103,
		0.00258813238081353,
		0.2141688292754046,
		0.09853681294649366,
		0.0032482869222918796,
		0.04359352675317102,
		0.01993526753171016,
		0.0036880011663507797,
		0.008011663507799971,
		0.12014696019827964,
		0.0029846916460125384,
		0.0017553579238956116,
		0.029470185158186325,
		0.010413179763813967,
		0.030699518880303252,
		0.03508499781309229,
		0.002021285901734947,
		0.0010613792097973467,
		0.0005295232541186761,
		0.009677212421635807,
		0.010585799679253535,
		0.17101734946785244,
		0.07968625164018078,
		0.007839043592360402,
		0.005438693687126403,
		0.0183606939787141,
		0.2732701559994168,
		0.004953491762647616,
		0.007259367254701851,
		0.008104971570199739,
		0.13274588132380813,
		0.004210526315789474,
		0.004997813092287506,
		0.017006560723137484,
		0.007442484327161393,
		0.016789619478058026,
		0.08477737279486806,
		0.005106283714827234,
		0.0005026971861787433,
		0.04040355736987899,
		0.037535500801866156,
		0.00885960052485785,
		0.0336410555474559,
		0.007066919376002332,
		0.005344219273946639,
		0.0006333284735384167,
		0.010684939495553289,
		0.0063064586674442345,
		0.15386849394955532,
		0.015049424114302375,
		0.012162705933809595,
		0.020425134859308938,
		0.037366379938766583,
		0.02157165767604607,
		0.009373961218836564,
		0.0173214754337367,
		0.009616562181075958,
		0.029522670943286193,
		0.010154249890654615,
		0.018600962239393497,
		0.06362210234728094,
		0.03157078291296107,
		0.151603440734801,
		0.0062329785683044175,
		0.014775331681003062,
		0.0020854351946347867,
		0.1826342032366234,
		0.0878017203674005,
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