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<?php
/**
* WPSEO plugin file.
*
* @package WPSEO\Internals\Options
*/
/**
* This abstract class and its concrete classes implement defaults and value validation for
* all WPSEO options and subkeys within options.
*
* Some guidelines:
* [Retrieving options]
* - Use the normal get_option() to retrieve an option. You will receive a complete array for the option.
* Any subkeys which were not set, will have their default values in place.
* - In other words, you will normally not have to check whether a subkey isset() as they will *always* be set.
* They will also *always* be of the correct variable type.
* The only exception to this are the options with variable option names based on post_type or taxonomy
* as those will not always be available before the taxonomy/post_type is registered.
* (they will be available if a value was set, they won't be if it wasn't as the class won't know
* that a default needs to be injected).
*
* [Updating/Adding options]
* - For multisite site_options, please use the WPSEO_Options::update_site_option() method.
* - For normal options, use the normal add/update_option() functions. As long as the classes here
* are instantiated, validation for all options and their subkeys will be automatic.
* - On (successful) update of a couple of options, certain related actions will be run automatically.
* Some examples:
* - on change of wpseo[yoast_tracking], the cron schedule will be adjusted accordingly
* - on change of wpseo and wpseo_title, some caches will be cleared
*
* [Important information about add/updating/changing these classes]
* - Make sure that option array key names are unique across options. The WPSEO_Options::get_all()
* method merges most options together. If any of them have non-unique names, even if they
* are in a different option, they *will* overwrite each other.
* - When you add a new array key in an option: make sure you add proper defaults and add the key
* to the validation routine in the proper place or add a new validation case.
* You don't need to do any upgrading as any option returned will always be merged with the
* defaults, so new options will automatically be available.
* If the default value is a string which need translating, add this to the concrete class
* translate_defaults() method.
* - When you remove an array key from an option: if it's important that the option is really removed,
* add the WPSEO_Option::clean_up( $option_name ) method to the upgrade run.
* This will re-save the option and automatically remove the array key no longer in existence.
* - When you rename a sub-option: add it to the clean_option() routine and run that in the upgrade run.
* - When you change the default for an option sub-key, make sure you verify that the validation routine will
* still work the way it should.
* Example: changing a default from '' (empty string) to 'text' with a validation routine with tests
* for an empty string will prevent a user from saving an empty string as the real value. So the
* test for '' with the validation routine would have to be removed in that case.
* - If an option needs specific actions different from defined in this abstract class, you can just overrule
* a method by defining it in the concrete class.
*
* @todo [JRF => testers] Double check that validation will not cause errors when called
* from upgrade routine (some of the WP functions may not yet be available).
*/
abstract class WPSEO_Option {
/**
* Prefix for override option keys that allow or disallow the option key of the same name.
*
* @var string
*/
public const ALLOW_KEY_PREFIX = 'allow_';
/**
* Option name - MUST be set in concrete class and set to public.
*
* @var string
*/
protected $option_name;
/**
* Option group name for use in settings forms.
*
* Will be set automagically if not set in concrete class (i.e.
* if it conforms to the normal pattern 'yoast' . $option_name . 'options',
* only set in concrete class if it doesn't).
*
* @var string
*/
public $group_name;
/**
* Whether to include the option in the return for WPSEO_Options::get_all().
*
* Also determines which options are copied over for ms_(re)set_blog().
*
* @var bool
*/
public $include_in_all = true;
/**
* Whether this option is only for when the install is multisite.
*
* @var bool
*/
public $multisite_only = false;
/**
* Array of defaults for the option - MUST be set in concrete class.
*
* Shouldn't be requested directly, use $this->get_defaults();
*
* @var array
*/
protected $defaults;
/**
* Array of variable option name patterns for the option - if any.
*
* Set this when the option contains array keys which vary based on post_type
* or taxonomy.
*
* @var array
*/
protected $variable_array_key_patterns;
/**
* Array of sub-options which should not be overloaded with multi-site defaults.
*
* @var array
*/
public $ms_exclude = [];
/**
* Name for an option higher in the hierarchy to override setting access.
*
* @var string
*/
protected $override_option_name;
/**
* Instance of this class.
*
* @var WPSEO_Option
*/
protected static $instance;
/* *********** INSTANTIATION METHODS *********** */
/**
* Add all the actions and filters for the option.
*/
protected function __construct() {
/* Add filters which get applied to the get_options() results. */
$this->add_default_filters(); // Return defaults if option not set.
$this->add_option_filters(); // Merge with defaults if option *is* set.
if ( $this->multisite_only !== true ) {
/**
* The option validation routines remove the default filters to prevent failing
* to insert an option if it's new. Let's add them back afterwards.
*/
add_action( 'add_option', [ $this, 'add_default_filters_if_same_option' ] ); // Adding back after INSERT.
add_action( 'update_option', [ $this, 'add_default_filters_if_same_option' ] );
add_filter( 'pre_update_option', [ $this, 'add_default_filters_if_not_changed' ], PHP_INT_MAX, 3 );
// Refills the cache when the option has been updated.
add_action( 'update_option_' . $this->option_name, [ 'WPSEO_Options', 'clear_cache' ], 10 );
}
elseif ( is_multisite() ) {
/*
* The option validation routines remove the default filters to prevent failing
* to insert an option if it's new. Let's add them back afterwards.
*
* For site_options, this method is not foolproof as these actions are not fired
* on an insert/update failure. Please use the WPSEO_Options::update_site_option() method
* for updating site options to make sure the filters are in place.
*/
add_action( 'add_site_option_' . $this->option_name, [ $this, 'add_default_filters' ] );
add_action( 'update_site_option_' . $this->option_name, [ $this, 'add_default_filters' ] );
add_filter( 'pre_update_site_option_' . $this->option_name, [ $this, 'add_default_filters_if_not_changed' ], PHP_INT_MAX, 3 );
// Refills the cache when the option has been updated.
add_action( 'update_site_option_' . $this->option_name, [ 'WPSEO_Options', 'clear_cache' ], 1, 0 );
}
/*
* Make sure the option will always get validated, independently of register_setting()
* (only available on back-end).
*/
add_filter( 'sanitize_option_' . $this->option_name, [ $this, 'validate' ] );
/* Register our option for the admin pages */
add_action( 'admin_init', [ $this, 'register_setting' ] );
/* Set option group name if not given */
if ( ! isset( $this->group_name ) || $this->group_name === '' ) {
$this->group_name = 'yoast_' . $this->option_name . '_options';
}
/* Translate some defaults as early as possible - textdomain is loaded in init on priority 1. */
if ( method_exists( $this, 'translate_defaults' ) ) {
add_action( 'init', [ $this, 'translate_defaults' ], 2 );
}
/**
* Enrich defaults once custom post types and taxonomies have been registered
* which is normally done on the init action.
*
* @todo [JRF/testers] Verify that none of the options which are only available after
* enrichment are used before the enriching.
*/
if ( method_exists( $this, 'enrich_defaults' ) ) {
add_action( 'init', [ $this, 'enrich_defaults' ], 99 );
}
}
/*
* All concrete classes *must* contain the get_instance method.
*
* {@internal Unfortunately I can't define it as an abstract as it also *has* to be static...}}
*
* ```
* abstract protected static function get_instance();
* ```
* ---------------
*
* Concrete classes *may* contain a translate_defaults method.
* ```
* abstract public function translate_defaults();
* ```
* ---------------
*
* Concrete classes *may* contain an enrich_defaults method to add additional defaults once
* all post_types and taxonomies have been registered.
*
* ```
* abstract public function enrich_defaults();
* ```
*/
/* *********** METHODS INFLUENCING get_option() *********** */
/**
* Add filters to make sure that the option default is returned if the option is not set.
*
* @return void
*/
public function add_default_filters() {
// Don't change, needs to check for false as could return prio 0 which would evaluate to false.
if ( has_filter( 'default_option_' . $this->option_name, [ $this, 'get_defaults' ] ) === false ) {
add_filter( 'default_option_' . $this->option_name, [ $this, 'get_defaults' ] );
}
}
/**
* Adds back the default filters that were removed during validation if the option was changed.
* Checks if this option was changed to prevent constantly checking if filters are present.
*
* @param string $option_name The option name.
*
* @return void
*/
public function add_default_filters_if_same_option( $option_name ) {
if ( $option_name === $this->option_name ) {
$this->add_default_filters();
}
}
/**
* Adds back the default filters that were removed during validation if the option was not changed.
* This is because in that case the latter actions are not called and thus the filters are never
* added back.
*
* @param mixed $value The current value.
* @param string $option_name The option name.
* @param mixed $old_value The old value.
*
* @return string The current value.
*/
public function add_default_filters_if_not_changed( $value, $option_name, $old_value ) {
if ( $option_name !== $this->option_name ) {
return $value;
}
if ( $value === $old_value || maybe_serialize( $value ) === maybe_serialize( $old_value ) ) {
$this->add_default_filters();
}
return $value;
}
/**
* Validate webmaster tools & Pinterest verification strings.
*
* @param string $key Key to check, by type of service.
* @param array $dirty Dirty data with the new values.
* @param array $old Old data.
* @param array $clean Clean data by reference, normally the default values.
*
* @return void
*/
public function validate_verification_string( $key, $dirty, $old, &$clean ) {
if ( isset( $dirty[ $key ] ) && $dirty[ $key ] !== '' ) {
$meta = $dirty[ $key ];
if ( strpos( $meta, 'content=' ) ) {
// Make sure we only have the real key, not a complete meta tag.
preg_match( '`content=([\'"])?([^\'"> ]+)(?:\1|[ />])`', $meta, $match );
if ( isset( $match[2] ) ) {
$meta = $match[2];
}
unset( $match );
}
$meta = sanitize_text_field( $meta );
if ( $meta !== '' ) {
$regex = '`^[A-Fa-f0-9_-]+$`';
switch ( $key ) {
case 'googleverify':
case 'baiduverify':
$regex = '`^[A-Za-z0-9_-]+$`';
break;
case 'msverify':
case 'pinterestverify':
case 'yandexverify':
break;
}
if ( preg_match( $regex, $meta ) ) {
$clean[ $key ] = $meta;
}
else {
// Restore the previous value, if any.
if ( isset( $old[ $key ] ) && preg_match( $regex, $old[ $key ] ) ) {
$clean[ $key ] = $old[ $key ];
}
Yoast_Input_Validation::add_dirty_value_to_settings_errors( $key, $meta );
}
}
}
}
/**
* Validates an option as a valid URL. Prints out a WordPress settings error
* notice if the URL is invalid.
*
* @param string $key Key to check, by type of URL setting.
* @param array $dirty Dirty data with the new values.
* @param array $old Old data.
* @param array $clean Clean data by reference, normally the default values.
*
* @return void
*/
public function validate_url( $key, $dirty, $old, &$clean ) {
if ( isset( $dirty[ $key ] ) && $dirty[ $key ] !== '' ) {
$submitted_url = trim( $dirty[ $key ] );
$validated_url = filter_var( WPSEO_Utils::sanitize_url( $submitted_url ), FILTER_VALIDATE_URL );
if ( $validated_url === false ) {
// Restore the previous URL value, if any.
if ( isset( $old[ $key ] ) && $old[ $key ] !== '' ) {
$url = WPSEO_Utils::sanitize_url( $old[ $key ] );
if ( $url !== '' ) {
$clean[ $key ] = $url;
}
}
Yoast_Input_Validation::add_dirty_value_to_settings_errors( $key, $submitted_url );
return;
}
// The URL format is valid, let's sanitize it.
$url = WPSEO_Utils::sanitize_url( $validated_url );
if ( $url !== '' ) {
$clean[ $key ] = $url;
}
}
}
/**
* Remove the default filters.
* Called from the validate() method to prevent failure to add new options.
*
* @return void
*/
public function remove_default_filters() {
remove_filter( 'default_option_' . $this->option_name, [ $this, 'get_defaults' ] );
}
/**
* Get the enriched default value for an option.
*
* Checks if the concrete class contains an enrich_defaults() method and if so, runs it.
*
* {@internal The enrich_defaults method is used to set defaults for variable array keys
* in an option, such as array keys depending on post_types and/or taxonomies.}}
*
* @return array
*/
public function get_defaults() {
if ( method_exists( $this, 'translate_defaults' ) ) {
$this->translate_defaults();
}
if ( method_exists( $this, 'enrich_defaults' ) ) {
$this->enrich_defaults();
}
return apply_filters( 'wpseo_defaults', $this->defaults, $this->option_name );
}
/**
* Add filters to make sure that the option is merged with its defaults before being returned.
*
* @return void
*/
public function add_option_filters() {
// Don't change, needs to check for false as could return prio 0 which would evaluate to false.
if ( has_filter( 'option_' . $this->option_name, [ $this, 'get_option' ] ) === false ) {
add_filter( 'option_' . $this->option_name, [ $this, 'get_option' ] );
}
}
/**
* Remove the option filters.
* Called from the clean_up methods to make sure we retrieve the original old option.
*
* @return void
*/
public function remove_option_filters() {
remove_filter( 'option_' . $this->option_name, [ $this, 'get_option' ] );
}
/**
* Merge an option with its default values.
*
* This method should *not* be called directly!!! It is only meant to filter the get_option() results.
*
* @param mixed $options Option value.
*
* @return mixed Option merged with the defaults for that option.
*/
public function get_option( $options = null ) {
$filtered = $this->array_filter_merge( $options );
/*
* If the option contains variable option keys, make sure we don't remove those settings
* - even if the defaults are not complete yet.
* Unfortunately this means we also won't be removing the settings for post types or taxonomies
* which are no longer in the WP install, but rather that than the other way around.
*/
if ( isset( $this->variable_array_key_patterns ) ) {
$filtered = $this->retain_variable_keys( $options, $filtered );
}
return $filtered;
}
/* *********** METHODS influencing add_option(), update_option() and saving from admin pages. *********** */
/**
* Register (whitelist) the option for the configuration pages.
* The validation callback is already registered separately on the sanitize_option hook,
* so no need to double register.
*
* @return void
*/
public function register_setting() {
if ( ! WPSEO_Capability_Utils::current_user_can( 'wpseo_manage_options' ) ) {
return;
}
if ( $this->multisite_only === true ) {
$network_settings_api = Yoast_Network_Settings_API::get();
if ( $network_settings_api->meets_requirements() ) {
$network_settings_api->register_setting( $this->group_name, $this->option_name );
}
return;
}
register_setting( $this->group_name, $this->option_name );
}
/**
* Validate the option.
*
* @param mixed $option_value The unvalidated new value for the option.
*
* @return array Validated new value for the option.
*/
public function validate( $option_value ) {
$clean = $this->get_defaults();
/* Return the defaults if the new value is empty. */
if ( ! is_array( $option_value ) || $option_value === [] ) {
return $clean;
}
$option_value = array_map( [ 'WPSEO_Utils', 'trim_recursive' ], $option_value );
$old = $this->get_original_option();
if ( ! is_array( $old ) ) {
$old = [];
}
$old = array_merge( $clean, $old );
$clean = $this->validate_option( $option_value, $clean, $old );
// Prevent updates to variables that are disabled via the override option.
$clean = $this->prevent_disabled_options_update( $clean, $old );
/* Retain the values for variable array keys even when the post type/taxonomy is not yet registered. */
if ( isset( $this->variable_array_key_patterns ) ) {
$clean = $this->retain_variable_keys( $option_value, $clean );
}
$this->remove_default_filters();
return $clean;
}
/**
* Checks whether a specific option key is disabled.
*
* This is determined by whether an override option is available with a key that equals the given key prefixed
* with 'allow_'.
*
* @param string $key Option key.
*
* @return bool True if option key is disabled, false otherwise.
*/
public function is_disabled( $key ) {
$override_option = $this->get_override_option();
if ( empty( $override_option ) ) {
return false;
}
return isset( $override_option[ self::ALLOW_KEY_PREFIX . $key ] ) && ! $override_option[ self::ALLOW_KEY_PREFIX . $key ];
}
/**
* All concrete classes must contain a validate_option() method which validates all
* values within the option.
*
* @param array $dirty New value for the option.
* @param array $clean Clean value for the option, normally the defaults.
* @param array $old Old value of the option.
*/
abstract protected function validate_option( $dirty, $clean, $old );
/* *********** METHODS for ADDING/UPDATING/UPGRADING the option. *********** */
/**
* Retrieve the real old value (unmerged with defaults).
*
* @return array|bool The original option value (which can be false if the option doesn't exist).
*/
protected function get_original_option() {
$this->remove_default_filters();
$this->remove_option_filters();
// Get (unvalidated) array, NOT merged with defaults.
if ( $this->multisite_only !== true ) {
$option_value = get_option( $this->option_name );
}
else {
$option_value = get_site_option( $this->option_name );
}
$this->add_option_filters();
$this->add_default_filters();
return $option_value;
}
/**
* Add the option if it doesn't exist for some strange reason.
*
* @uses WPSEO_Option::get_original_option()
*
* @return void
*/
public function maybe_add_option() {
if ( $this->get_original_option() === false ) {
if ( $this->multisite_only !== true ) {
update_option( $this->option_name, $this->get_defaults() );
}
else {
$this->update_site_option( $this->get_defaults() );
}
}
}
/**
* Update a site_option.
*
* {@internal This special method is only needed for multisite options, but very needed indeed there.
* The order in which certain functions and hooks are run is different between
* get_option() and get_site_option() which means in practice that the removing
* of the default filters would be done too late and the re-adding of the default
* filters might not be done at all.
* Aka: use the WPSEO_Options::update_site_option() method (which calls this method)
* for safely adding/updating multisite options.}}
*
* @param mixed $value The new value for the option.
*
* @return bool Whether the update was successful.
*/
public function update_site_option( $value ) {
if ( $this->multisite_only === true && is_multisite() ) {
$this->remove_default_filters();
$result = update_site_option( $this->option_name, $value );
$this->add_default_filters();
return $result;
}
else {
return false;
}
}
/**
* Retrieve the real old value (unmerged with defaults), clean and re-save the option.
*
* @uses WPSEO_Option::get_original_option()
* @uses WPSEO_Option::import()
*
* @param string|null $current_version Optional. Version from which to upgrade, if not set,
* version-specific upgrades will be disregarded.
*
* @return void
*/
public function clean( $current_version = null ) {
$option_value = $this->get_original_option();
$this->import( $option_value, $current_version );
}
/**
* Clean and re-save the option.
*
* @uses clean_option() method from concrete class if it exists.
*
* @todo [JRF/whomever] Figure out a way to show settings error during/after the upgrade - maybe
* something along the lines of:
* -> add them to a property in this class
* -> if that property isset at the end of the routine and add_settings_error function does not exist,
* save as transient (or update the transient if one already exists)
* -> next time an admin is in the WP back-end, show the errors and delete the transient or only delete it
* once the admin has dismissed the message (add ajax function)
* Important: all validation routines which add_settings_errors would need to be changed for this to work
*
* @param array $option_value Option value to be imported.
* @param string|null $current_version Optional. Version from which to upgrade, if not set,
* version-specific upgrades will be disregarded.
* @param array|null $all_old_option_values Optional. Only used when importing old options to
* have access to the real old values, in contrast to
* the saved ones.
*
* @return void
*/
public function import( $option_value, $current_version = null, $all_old_option_values = null ) {
if ( $option_value === false ) {
$option_value = $this->get_defaults();
}
elseif ( is_array( $option_value ) && method_exists( $this, 'clean_option' ) ) {
$option_value = $this->clean_option( $option_value, $current_version, $all_old_option_values );
}
/*
* Save the cleaned value - validation will take care of cleaning out array keys which
* should no longer be there.
*/
if ( $this->multisite_only !== true ) {
update_option( $this->option_name, $option_value );
}
else {
$this->update_site_option( $this->option_name, $option_value );
}
}
/**
* Returns the variable array key patterns for an options class.
*
* @return array
*/
public function get_patterns() {
return (array) $this->variable_array_key_patterns;
}
/**
* Retrieves the option name.
*
* @return string The set option name.
*/
public function get_option_name() {
return $this->option_name;
}
/*
* Concrete classes *may* contain a clean_option method which will clean out old/renamed
* values within the option.
*
* ```
* abstract public function clean_option( $option_value, $current_version = null, $all_old_option_values = null );
* ```
*/
/* *********** HELPER METHODS for internal use. *********** */
/**
* Helper method - Combines a fixed array of default values with an options array
* while filtering out any keys which are not in the defaults array.
*
* @todo [JRF] - shouldn't this be a straight array merge ? at the end of the day, the validation
* removes any invalid keys on save.
*
* @param array|null $options Optional. Current options. If not set, the option defaults
* for the $option_key will be returned.
*
* @return array Combined and filtered options array.
*/
protected function array_filter_merge( $options = null ) {
$defaults = $this->get_defaults();
if ( ! isset( $options ) || $options === false || $options === [] ) {
return $defaults;
}
$options = (array) $options;
/*
$filtered = array();
if ( $defaults !== array() ) {
foreach ( $defaults as $key => $default_value ) {
// @todo should this walk through array subkeys ?
$filtered[ $key ] = ( isset( $options[ $key ] ) ? $options[ $key ] : $default_value );
}
}
*/
$filtered = array_merge( $defaults, $options );
return $filtered;
}
/**
* Sets updated values for variables that are disabled via the override option back to their previous values.
*
* @param array $updated Updated option value.
* @param array $old Old option value.
*
* @return array Updated option value, with all disabled variables set to their old values.
*/
protected function prevent_disabled_options_update( $updated, $old ) {
$override_option = $this->get_override_option();
if ( empty( $override_option ) ) {
return $updated;
}
/*
* This loop could as well call `is_disabled( $key )` for each iteration,
* however this would be worse performance-wise.
*/
foreach ( $old as $key => $value ) {
if ( isset( $override_option[ self::ALLOW_KEY_PREFIX . $key ] ) && ! $override_option[ self::ALLOW_KEY_PREFIX . $key ] ) {
$updated[ $key ] = $old[ $key ];
}
}
return $updated;
}
/**
* Retrieves the value of the override option, if available.
*
* An override option contains values that may determine access to certain sub-variables
* of this option.
*
* Only regular options in multisite can have override options, which in that case
* would be network options.
*
* @return array Override option value, or empty array if unavailable.
*/
protected function get_override_option() {
if ( empty( $this->override_option_name ) || $this->multisite_only === true || ! is_multisite() ) {
return [];
}
return get_site_option( $this->override_option_name, [] );
}
/**
* Make sure that any set option values relating to post_types and/or taxonomies are retained,
* even when that post_type or taxonomy may not yet have been registered.
*
* {@internal The wpseo_titles concrete class overrules this method. Make sure that any
* changes applied here, also get ported to that version.}}
*
* @param array $dirty Original option as retrieved from the database.
* @param array $clean Filtered option where any options which shouldn't be in our option
* have already been removed and any options which weren't set
* have been set to their defaults.
*
* @return array
*/
protected function retain_variable_keys( $dirty, $clean ) {
if ( ( is_array( $this->variable_array_key_patterns ) && $this->variable_array_key_patterns !== [] ) && ( is_array( $dirty ) && $dirty !== [] ) ) {
foreach ( $dirty as $key => $value ) {
// Do nothing if already in filtered options.
if ( isset( $clean[ $key ] ) ) {
continue;
}
foreach ( $this->variable_array_key_patterns as $pattern ) {
if ( strpos( $key, $pattern ) === 0 ) {
$clean[ $key ] = $value;
break;
}
}
}
}
return $clean;
}
/**
* Check whether a given array key conforms to one of the variable array key patterns for this option.
*
* @used-by validate_option() methods for options with variable array keys.
*
* @param string $key Array key to check.
*
* @return string Pattern if it conforms, original array key if it doesn't or if the option
* does not have variable array keys.
*/
protected function get_switch_key( $key ) {
if ( ! isset( $this->variable_array_key_patterns ) || ( ! is_array( $this->variable_array_key_patterns ) || $this->variable_array_key_patterns === [] ) ) {
return $key;
}
foreach ( $this->variable_array_key_patterns as $pattern ) {
if ( strpos( $key, $pattern ) === 0 ) {
return $pattern;
}
}
return $key;
}
}