<?php

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/**

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* WPSEO plugin file.

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*

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* @package WPSEO\Internals

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* @since 1.5.0

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*/

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use Yoast\WP\SEO\Config\Schema_Types;

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use Yoast\WP\SEO\Helpers\Schema\Article_Helper;

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use Yoast\WP\SEO\Repositories\Indexable_Repository;

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/**

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* This class implements defaults and value validation for all WPSEO Post Meta values.

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*

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* Some guidelines:

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* - To update a meta value, you can just use update_post_meta() with the full (prefixed) meta key

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* or the convenience method WPSEO_Meta::set_value() with the internal key.

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* All updates will be automatically validated.

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* Meta values will only be saved to the database if they are *not* the same as the default to

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* keep database load low.

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* - To retrieve a WPSEO meta value, you **must** use WPSEO_Meta::get_value() which will always return a

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* string value, either the saved value or the default.

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* This method can also retrieve a complete set of WPSEO meta values for one specific post, see

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* the method documentation for the parameters.

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*

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* {@internal Unfortunately there isn't a filter available to hook into before returning the results

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* for get_post_meta(), get_post_custom() and the likes. That would have been the

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* preferred solution.}}

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*

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* {@internal All WP native get_meta() results get cached internally, so no need to cache locally.}}

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* {@internal Use $key when the key is the WPSEO internal name (without prefix), $meta_key when it

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* includes the prefix.}}

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*/

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class WPSEO_Meta {

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/**

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* Prefix for all WPSEO meta values in the database.

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*

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* {@internal If at any point this would change, quite apart from an upgrade routine,

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* this also will need to be changed in the wpml-config.xml file.}}

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*

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* @var string

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*/

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public static $meta_prefix = '_yoast_wpseo_';

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/**

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* Prefix for all WPSEO meta value form field names and ids.

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*

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* @var string

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*/

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public static $form_prefix = 'yoast_wpseo_';

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/**

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* Allowed length of the meta description.

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*

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* @var int

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*/

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public static $meta_length = 156;

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/**

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* Reason the meta description is not the default length.

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*

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* @var string

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*/

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public static $meta_length_reason = '';

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/**

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* Meta box field definitions for the meta box form.

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*

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* {@internal

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* - Titles, help texts, description text and option labels are added via a translate_meta_boxes() method

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* in the relevant child classes (WPSEO_Metabox and WPSEO_Social_admin) as they are only needed there.

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* - Beware: even though the meta keys are divided into subsets, they still have to be uniquely named!}}

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*

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* @var array

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* Array format:

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* (required) 'type' => (string) field type. i.e. text / textarea / checkbox /

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* radio / select / multiselect / upload etc.

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* (required) 'title' => (string) table row title.

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* (recommended) 'default_value' => (string|array) default value for the field.

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* IMPORTANT:

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* - if the field has options, the default has to be the

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* key of one of the options.

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* - if the field is a text field, the default **has** to be

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* an empty string as otherwise the user can't save

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* an empty value/delete the meta value.

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* - if the field is a checkbox, the only valid values

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* are 'on' or 'off'.

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* (semi-required) 'options' => (array) options for used with (multi-)select and radio

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* fields, required if that's the field type.

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* key = (string) value which will be saved to db.

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* value = (string) text label for the option.

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* (optional) 'autocomplete' => (bool) whether autocomplete is on for text fields,

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* defaults to true.

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* (optional) 'class' => (string) classname(s) to add to the actual <input> tag.

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* (optional) 'description' => (string) description to show underneath the field.

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* (optional) 'expl' => (string) label for a checkbox.

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* (optional) 'help' => (string) help text to show on mouse over ? image.

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* (optional) 'rows' => (int) number of rows for a textarea, defaults to 3.

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* (optional) 'placeholder' => (string) Currently only used by add-on plugins.

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* (optional) 'serialized' => (bool) whether the value is expected to be serialized,

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* i.e. an array or object, defaults to false.

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* Currently only used by add-on plugins.

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*/

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public static $meta_fields = [

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'general' => [

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'focuskw' => [

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'type' => 'hidden',

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'title' => '',

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],

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'title' => [

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'type' => 'hidden',

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'title' => '', // Translation added later.

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'default_value' => '',

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'description' => '', // Translation added later.

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'help' => '', // Translation added later.

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],

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'metadesc' => [

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'type' => 'hidden',

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'title' => '', // Translation added later.

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'default_value' => '',

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'class' => 'metadesc',

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'rows' => 2,

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'description' => '', // Translation added later.

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'help' => '', // Translation added later.

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],

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'linkdex' => [

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'type' => 'hidden',

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'title' => 'linkdex',

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'default_value' => '0',

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'description' => '',

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],

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'content_score' => [

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'type' => 'hidden',

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'title' => 'content_score',

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'default_value' => '0',

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'description' => '',

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],

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'inclusive_language_score' => [

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'type' => 'hidden',

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'title' => 'inclusive_language_score',

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'default_value' => '0',

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'description' => '',

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],

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'is_cornerstone' => [

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'type' => 'hidden',

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'title' => 'is_cornerstone',

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'default_value' => 'false',

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'description' => '',

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],

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],

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'advanced' => [

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'meta-robots-noindex' => [

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'type' => 'hidden',

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'title' => '', // Translation added later.

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'default_value' => '0', // = post-type default.

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'options' => [

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'0' => '', // Post type default - translation added later.

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'2' => '', // Index - translation added later.

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'1' => '', // No-index - translation added later.

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],

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],

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'meta-robots-nofollow' => [

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'type' => 'hidden',

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'title' => '', // Translation added later.

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'default_value' => '0', // = follow.

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'options' => [

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'0' => '', // Follow - translation added later.

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'1' => '', // No-follow - translation added later.

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],

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],

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'meta-robots-adv' => [

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'type' => 'hidden',

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'title' => '', // Translation added later.

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'default_value' => '',

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'description' => '', // Translation added later.

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'options' => [

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'noimageindex' => '', // Translation added later.

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'noarchive' => '', // Translation added later.

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'nosnippet' => '', // Translation added later.

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],

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],

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'bctitle' => [

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'type' => 'hidden',

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'title' => '', // Translation added later.

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'default_value' => '',

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'description' => '', // Translation added later.

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],

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'canonical' => [

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'type' => 'hidden',

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'title' => '', // Translation added later.

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'default_value' => '',

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'description' => '', // Translation added later.

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],

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'redirect' => [

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'type' => 'url',

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'title' => '', // Translation added later.

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'default_value' => '',

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'description' => '', // Translation added later.

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],

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],

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'social' => [],

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'schema' => [

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'schema_page_type' => [

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'type' => 'hidden',

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'title' => '',

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'options' => Schema_Types::PAGE_TYPES,

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],

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'schema_article_type' => [

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'type' => 'hidden',

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'title' => '',

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'hide_on_pages' => true,

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'options' => Schema_Types::ARTICLE_TYPES,

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],

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],

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/* Fields we should validate & save, but not show on any form. */

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'non_form' => [

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'linkdex' => [

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'type' => null,

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'default_value' => '0',

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],

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'zapier_trigger_sent' => [

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'type' => null,

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'default_value' => '0',

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],

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],

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];

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/**

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* Helper property - reverse index of the definition array.

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*

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* Format: [full meta key including prefix] => array

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* ['subset'] => (string) primary index

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* ['key'] => (string) internal key

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*

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* @var array

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*/

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public static $fields_index = [];

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/**

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* Helper property - array containing only the defaults in the format:

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* [full meta key including prefix] => (string) default value

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*

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* @var array

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*/

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public static $defaults = [];

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/**

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* Helper property to define the social network meta field definitions - networks.

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*

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* @var array

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*/

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private static $social_networks = [

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'opengraph' => 'opengraph',

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'twitter' => 'twitter',

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];

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/**

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* Helper property to define the social network meta field definitions - fields and their type.

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*

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* @var array

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*/

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private static $social_fields = [

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'title' => 'hidden',

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'description' => 'hidden',

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'image' => 'hidden',

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'image-id' => 'hidden',

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];

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/**

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* Register our actions and filters.

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*

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* @return void

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*/

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public static function init() {

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foreach ( self::$social_networks as $option => $network ) {

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if ( WPSEO_Options::get( $option, false ) === true ) {

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foreach ( self::$social_fields as $box => $type ) {

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self::$meta_fields['social'][ $network . '-' . $box ] = [

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'type' => $type,

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'title' => '', // Translation added later.

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'default_value' => '',

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'description' => '', // Translation added later.

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];

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}

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}

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}

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unset( $option, $network, $box, $type );

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/**

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* Allow add-on plugins to register their meta fields for management by this class.

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* Calls to add_filter() must be made before plugins_loaded prio 14.

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*/

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$extra_fields = apply_filters( 'add_extra_wpseo_meta_fields', [] );

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if ( is_array( $extra_fields ) ) {

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self::$meta_fields = self::array_merge_recursive_distinct( $extra_fields, self::$meta_fields );

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}

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unset( $extra_fields );

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foreach ( self::$meta_fields as $subset => $field_group ) {

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foreach ( $field_group as $key => $field_def ) {

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register_meta(

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'post',

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self::$meta_prefix . $key,

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[ 'sanitize_callback' => [ self::class, 'sanitize_post_meta' ] ]

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);

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// Set the $fields_index property for efficiency.

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self::$fields_index[ self::$meta_prefix . $key ] = [

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'subset' => $subset,

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'key' => $key,

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];

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// Set the $defaults property for efficiency.

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if ( isset( $field_def['default_value'] ) ) {

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self::$defaults[ self::$meta_prefix . $key ] = $field_def['default_value'];

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}

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else {

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// Meta will always be a string, so let's make the meta meta default also a string.

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self::$defaults[ self::$meta_prefix . $key ] = '';

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}

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}

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}

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unset( $subset, $field_group, $key, $field_def );

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self::filter_schema_article_types();

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add_filter( 'update_post_metadata', [ self::class, 'remove_meta_if_default' ], 10, 5 );

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add_filter( 'add_post_metadata', [ self::class, 'dont_save_meta_if_default' ], 10, 4 );

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}

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/**

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* Retrieve the meta box form field definitions for the given tab and post type.

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*

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* @param string $tab Tab for which to retrieve the field definitions.

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* @param string $post_type Post type of the current post.

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*

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* @return array Array containing the meta box field definitions.

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*/

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public static function get_meta_field_defs( $tab, $post_type = 'post' ) {

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if ( ! isset( self::$meta_fields[ $tab ] ) ) {

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return [];

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}

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$field_defs = self::$meta_fields[ $tab ];

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switch ( $tab ) {

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case 'non-form':

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// Prevent non-form fields from being passed to forms.

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$field_defs = [];

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break;

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case 'advanced':

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global $post;

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if ( ! WPSEO_Capability_Utils::current_user_can( 'wpseo_edit_advanced_metadata' ) && WPSEO_Options::get( 'disableadvanced_meta' ) ) {

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return [];

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}

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$post_type = '';

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if ( isset( $post->post_type ) ) {

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$post_type = $post->post_type;

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}

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elseif ( ! isset( $post->post_type ) && isset( $_GET['post_type'] ) ) {

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$post_type = sanitize_text_field( $_GET['post_type'] );

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}

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if ( $post_type === '' ) {

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return [];

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}

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/* Adjust the no-index text strings based on the post type. */

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$post_type_object = get_post_type_object( $post_type );

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$field_defs['meta-robots-noindex']['title'] = sprintf( $field_defs['meta-robots-noindex']['title'], $post_type_object->labels->singular_name );

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$field_defs['meta-robots-noindex']['options']['0'] = sprintf( $field_defs['meta-robots-noindex']['options']['0'], ( ( WPSEO_Options::get( 'noindex-' . $post_type, false ) === true ) ? $field_defs['meta-robots-noindex']['options']['1'] : $field_defs['meta-robots-noindex']['options']['2'] ), $post_type_object->label );

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$field_defs['meta-robots-nofollow']['title'] = sprintf( $field_defs['meta-robots-nofollow']['title'], $post_type_object->labels->singular_name );

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/* Don't show the breadcrumb title field if breadcrumbs aren't enabled. */

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if ( WPSEO_Options::get( 'breadcrumbs-enable', false ) !== true && ! current_theme_supports( 'yoast-seo-breadcrumbs' ) ) {

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unset( $field_defs['bctitle'] );

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}

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if ( empty( $post->ID ) || ( ! empty( $post->ID ) && self::get_value( 'redirect', $post->ID ) === '' ) ) {

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unset( $field_defs['redirect'] );

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}

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break;

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case 'schema':

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if ( ! WPSEO_Capability_Utils::current_user_can( 'wpseo_edit_advanced_metadata' ) && WPSEO_Options::get( 'disableadvanced_meta' ) ) {

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return [];

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}

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$field_defs['schema_page_type']['default'] = WPSEO_Options::get( 'schema-page-type-' . $post_type );

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$article_helper = new Article_Helper();

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if ( $article_helper->is_article_post_type( $post_type ) ) {

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$default_schema_article_type = WPSEO_Options::get( 'schema-article-type-' . $post_type );

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/** This filter is documented in inc/options/class-wpseo-option-titles.php */

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$allowed_article_types = apply_filters( 'wpseo_schema_article_types', Schema_Types::ARTICLE_TYPES );

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if ( ! array_key_exists( $default_schema_article_type, $allowed_article_types ) ) {

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$default_schema_article_type = WPSEO_Options::get_default( 'wpseo_titles', 'schema-article-type-' . $post_type );

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}

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$field_defs['schema_article_type']['default'] = $default_schema_article_type;

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}

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else {

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unset( $field_defs['schema_article_type'] );

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}

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break;

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}

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/**

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* Filter the WPSEO metabox form field definitions for a tab.

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* {tab} can be 'general', 'advanced' or 'social'.

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*

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* @param array $field_defs Metabox form field definitions.

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* @param string $post_type Post type of the post the metabox is for, defaults to 'post'.

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*

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* @return array

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*/

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return apply_filters( 'wpseo_metabox_entries_' . $tab, $field_defs, $post_type );

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}

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/**

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* Validate the post meta values.

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*

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* @param mixed $meta_value The new value.

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* @param string $meta_key The full meta key (including prefix).

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*

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* @return string Validated meta value.

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*/

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public static function sanitize_post_meta( $meta_value, $meta_key ) {

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$field_def = self::$meta_fields[ self::$fields_index[ $meta_key ]['subset'] ][ self::$fields_index[ $meta_key ]['key'] ];

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$clean = self::$defaults[ $meta_key ];

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switch ( true ) {

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case ( $meta_key === self::$meta_prefix . 'linkdex' ):

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$int = WPSEO_Utils::validate_int( $meta_value );

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if ( $int !== false && $int >= 0 ) {

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$clean = strval( $int ); // Convert to string to make sure default check works.

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}

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break;

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case ( $field_def['type'] === 'checkbox' ):

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// Only allow value if it's one of the predefined options.

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if ( in_array( $meta_value, [ 'on', 'off' ], true ) ) {

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$clean = $meta_value;

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}

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break;

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case ( $field_def['type'] === 'select' || $field_def['type'] === 'radio' ):

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// Only allow value if it's one of the predefined options.

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if ( isset( $field_def['options'][ $meta_value ] ) ) {

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$clean = $meta_value;

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}

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break;

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case ( $field_def['type'] === 'hidden' && $meta_key === self::$meta_prefix . 'meta-robots-adv' ):

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$clean = self::validate_meta_robots_adv( $meta_value );

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break;

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case ( $field_def['type'] === 'url' || $meta_key === self::$meta_prefix . 'canonical' ):

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// Validate as url(-part).

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$url = WPSEO_Utils::sanitize_url( $meta_value );

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if ( $url !== '' ) {

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$clean = $url;

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}

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break;

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case ( $field_def['type'] === 'upload' && in_array( $meta_key, [ self::$meta_prefix . 'opengraph-image', self::$meta_prefix . 'twitter-image' ], true ) ):

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// Validate as url.

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$url = WPSEO_Utils::sanitize_url( $meta_value, [ 'http', 'https', 'ftp', 'ftps' ] );

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if ( $url !== '' ) {

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$clean = $url;

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}

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break;

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case ( $field_def['type'] === 'hidden' && $meta_key === self::$meta_prefix . 'is_cornerstone' ):

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$clean = $meta_value;

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/*

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* This used to be a checkbox, then became a hidden input.

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* To make sure the value remains consistent, we cast 'true' to '1'.

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*/

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if ( $meta_value === 'true' ) {

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$clean = '1';

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}

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break;

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case ( $field_def['type'] === 'hidden' && isset( $field_def['options'] ) ):

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// Only allow value if it's one of the predefined options.

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if ( isset( $field_def['options'][ $meta_value ] ) ) {

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$clean = $meta_value;

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}

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break;

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