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<?php |
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/** |
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* Security |
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* |
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* Functions related to sanitizing Code Embed meta values. |
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* |
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* @package simple-embed-code |
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*/ |
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|
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// Exit if accessed directly. |
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|
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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/** |
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* Sanitize Code Embed meta on every write |
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* |
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* Filter that fires on every call to update_metadata / add_metadata — including the |
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* wp_ajax_add_meta AJAX handler and the REST API, not just save_post. |
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* |
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* @param mixed $check Null to allow the operation, non-null to short-circuit. |
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* @param int $object_id Post ID. |
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* @param string $meta_key Meta key being written. |
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* @param mixed $meta_value Meta value being written. |
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* @return mixed Null to allow the write to proceed, or true to short-circuit it. |
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*/ |
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function sec_sanitize_meta_on_write( $check, $object_id, $meta_key, $meta_value ) { |
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|
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// Allow admins / editors with unfiltered_html to write without restriction. |
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if ( current_user_can( 'unfiltered_html' ) ) { |
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return $check; |
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} |
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|
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$options = get_option( 'artiss_code_embed' ); |
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|
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if ( ! is_array( $options ) || empty( $options['keyword_ident'] ) ) { |
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return $check; |
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} |
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|
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$prefix = $options['keyword_ident']; |
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|
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// Only act on meta keys that belong to this plugin. |
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if ( substr( $meta_key, 0, strlen( $prefix ) ) !== $prefix ) { |
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return $check; |
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} |
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|
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// Strip dangerous markup while preserving safe HTML. |
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$clean = wp_kses_post( $meta_value ); |
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|
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if ( $clean === $meta_value ) { |
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// Value is already clean — let the normal write proceed. |
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return $check; |
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} |
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|
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// The value was dirty. Remove this filter temporarily to avoid infinite recursion, write the sanitized value ourselves, then |
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// re-add the filter and short-circuit the original write. |
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remove_filter( 'update_post_metadata', 'sec_sanitize_meta_on_write', 10 ); |
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remove_filter( 'add_post_metadata', 'sec_sanitize_meta_on_write', 10 ); |
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|
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update_post_meta( $object_id, $meta_key, $clean ); |
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|
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add_filter( 'update_post_metadata', 'sec_sanitize_meta_on_write', 10, 4 ); |
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add_filter( 'add_post_metadata', 'sec_sanitize_meta_on_write', 10, 4 ); |
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|
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// Return a non-null value to short-circuit the original (unsanitized) write. |
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return true; |
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} |
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|
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add_filter( 'update_post_metadata', 'sec_sanitize_meta_on_write', 10, 4 ); |
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add_filter( 'add_post_metadata', 'sec_sanitize_meta_on_write', 10, 4 ); |
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|
