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<?php |
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/** |
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* Functions file. |
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* |
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* General utility functions for the ActivityPub plugin. |
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* |
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* @package Activitypub |
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*/ |
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|
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namespace Activitypub; |
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|
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/** |
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* Get the ActivityPub ID for a WordPress object. |
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* |
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* Returns the canonical ActivityPub URI for a WP_Post or WP_Comment. |
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* |
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* @param \WP_Post|\WP_Comment $wp_object The WordPress post or comment. |
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* |
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* @return string|null The ActivityPub ID (a URL), or null if unsupported type. |
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*/ |
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function get_object_id( $wp_object ) { |
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if ( $wp_object instanceof \WP_Post ) { |
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return get_post_id( $wp_object->ID ); |
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} |
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|
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if ( $wp_object instanceof \WP_Comment ) { |
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return get_comment_id( $wp_object ); |
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} |
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|
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return null; |
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} |
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|
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/** |
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* Convert a string from camelCase to snake_case. |
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* |
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* @param string $input The string to convert. |
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* |
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* @return string The converted string. |
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*/ |
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function camel_to_snake_case( $input ) { |
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return strtolower( preg_replace( '/(?<!^)[A-Z]/', '_$0', $input ) ); |
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} |
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|
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/** |
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* Convert a string from snake_case to camelCase. |
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* |
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* @param string $input The string to convert. |
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* |
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* @return string The converted string. |
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*/ |
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function snake_to_camel_case( $input ) { |
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return lcfirst( str_replace( '_', '', ucwords( $input, '_' ) ) ); |
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} |
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|
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/** |
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* Convert seconds to ISO 8601 duration format. |
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* |
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* @param int $seconds The duration in seconds. |
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* |
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* @return string The duration in ISO 8601 format (e.g., "PT1H23M45S"). |
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*/ |
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function seconds_to_iso8601( $seconds ) { |
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$seconds = (int) $seconds; |
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|
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if ( $seconds <= 0 ) { |
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return 'PT0S'; |
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} |
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|
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$hours = floor( $seconds / 3600 ); |
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$minutes = floor( ( $seconds % 3600 ) / 60 ); |
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$secs = $seconds % 60; |
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|
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$duration = 'PT'; |
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|
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if ( $hours > 0 ) { |
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$duration .= $hours . 'H'; |
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} |
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|
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if ( $minutes > 0 ) { |
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$duration .= $minutes . 'M'; |
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} |
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|
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if ( $secs > 0 || ( 0 === $hours && 0 === $minutes ) ) { |
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$duration .= $secs . 'S'; |
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} |
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|
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return $duration; |
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} |
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|
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/** |
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* Check if a site supports the block editor. |
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* |
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* @return boolean True if the site supports the block editor, false otherwise. |
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*/ |
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function site_supports_blocks() { |
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/** |
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* Allow plugins to disable block editor support, |
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* thus disabling blocks registered by the ActivityPub plugin. |
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* |
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* @param boolean $supports_blocks True if the site supports the block editor, false otherwise. |
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*/ |
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return apply_filters( 'activitypub_site_supports_blocks', true ); |
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} |
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|
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/** |
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* Check whether a blog is public based on the `blog_public` option. |
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* |
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* @return bool True if public, false if not |
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*/ |
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function is_blog_public() { |
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/** |
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* Filter whether the blog is public. |
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* |
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* @param bool $public Whether the blog is public. |
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*/ |
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return (bool) apply_filters( 'activitypub_is_blog_public', \get_option( 'blog_public', 1 ) ); |
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} |
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|
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/** |
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* Get the masked WordPress version to only show the major and minor version. |
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* |
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* @return string The masked version. |
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*/ |
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function get_masked_wp_version() { |
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// Only show the major and minor version. |
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$version = get_bloginfo( 'version' ); |
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// Strip the RC or beta part. |
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$version = preg_replace( '/-.*$/', '', $version ); |
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$version = explode( '.', $version ); |
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$version = array_slice( $version, 0, 2 ); |
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|
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return implode( '.', $version ); |
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} |
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|
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/** |
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* Check if a plugin is active, loading plugin.php if necessary. |
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* |
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* This is a wrapper around the core is_plugin_active() function that ensures |
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* the function is available by loading wp-admin/includes/plugin.php if needed. |
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* This is useful when checking plugin status outside of the admin context. |
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* |
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* @param string $plugin Plugin basename (e.g., 'plugin-folder/plugin-file.php'). |
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* |
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* @return bool True if the plugin is active, false otherwise. |
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*/ |
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function is_plugin_active( $plugin ) { |
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// Include plugin.php if not already loaded (needed for core is_plugin_active). |
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if ( ! \function_exists( 'is_plugin_active' ) ) { |
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require_once ABSPATH . 'wp-admin/includes/plugin.php'; |
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} |
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|
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return \is_plugin_active( $plugin ); |
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} |
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|
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/** |
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* Returns the website hosts allowed to credit this blog. |
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* |
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* @return array|null The attribution domains or null if not found. |
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*/ |
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function get_attribution_domains() { |
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if ( '1' !== \get_option( 'activitypub_use_opengraph', '1' ) ) { |
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return null; |
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} |
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|
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$domains = \get_option( 'activitypub_attribution_domains', home_host() ); |
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$domains = explode( PHP_EOL, $domains ); |
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|
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if ( ! $domains ) { |
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$domains = null; |
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} |
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|
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return $domains; |
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} |
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|
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/** |
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* Change the display of large numbers on the site. |
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* |
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* @author Jeremy Herve |
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* |
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* @see https://wordpress.org/support/topic/abbreviate-numbers-with-k/ |
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* |
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* @param string $formatted Converted number in string format. |
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* @param float $number The number to convert based on locale. |
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* |
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* @return string Converted number in string format. |
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*/ |
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function custom_large_numbers( $formatted, $number ) { |
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global $wp_locale; |
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|
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$decimals = 0; |
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$decimal_point = '.'; |
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$thousands_sep = ','; |
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|
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if ( isset( $wp_locale ) ) { |
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$decimals = (int) $wp_locale->number_format['decimal_point']; |
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$decimal_point = $wp_locale->number_format['decimal_point']; |
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$thousands_sep = $wp_locale->number_format['thousands_sep']; |
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} |
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|
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if ( $number < 1000 ) { // Any number less than a Thousand. |
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return \number_format( $number, $decimals, $decimal_point, $thousands_sep ); |
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} elseif ( $number < 1000000 ) { // Any number less than a million. |
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return \number_format( $number / 1000, $decimals, $decimal_point, $thousands_sep ) . 'K'; |
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} elseif ( $number < 1000000000 ) { // Any number less than a billion. |
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return \number_format( $number / 1000000, $decimals, $decimal_point, $thousands_sep ) . 'M'; |
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} else { // At least a billion. |
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return \number_format( $number / 1000000000, $decimals, $decimal_point, $thousands_sep ) . 'B'; |
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} |
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} |
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|
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/** |
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* Escapes a Tag, to be used as a hashtag. |
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* |
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* @param string $input The string to escape. |
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* |
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* @return string The escaped hashtag. |
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*/ |
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function esc_hashtag( $input ) { |
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$hashtag = \wp_specialchars_decode( $input, ENT_QUOTES ); |
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// Remove all characters that are not letters, numbers, or hyphens. |
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$hashtag = \preg_replace( '/[^\p{L}\p{Nd}-]+/u', '-', $hashtag ); |
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|
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// Capitalize every letter that is preceded by a hyphen. |
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$hashtag = preg_replace_callback( |
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'/-+(.)/', |
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static function ( $matches ) { |
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return strtoupper( $matches[1] ); |
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}, |
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$hashtag |
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); |
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|
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// Add a hashtag to the beginning of the string. |
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$hashtag = ltrim( $hashtag, '#' ); |
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$hashtag = trim( $hashtag, '-' ); |
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$hashtag = '#' . $hashtag; |
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|
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/** |
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* Allow defining your own custom hashtag generation rules. |
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* |
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* @param string $hashtag The hashtag to be returned. |
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* @param string $input The original string. |
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*/ |
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$hashtag = apply_filters( 'activitypub_esc_hashtag', $hashtag, $input ); |
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|
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return esc_html( $hashtag ); |
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} |
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|
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/** |
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* Replace content with links, mentions or hashtags by Regex callback and not affect protected tags. |
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* |
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* @param string $content The content that should be changed. |
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* @param string $regex The regex to use. |
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* @param callable $regex_callback Callback for replacement logic. |
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* |
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* @return string The content with links, mentions, hashtags, etc. |
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*/ |
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function enrich_content_data( $content, $regex, $regex_callback ) { |
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// Small protection against execution timeouts: limit to 1 MB. |
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if ( mb_strlen( $content ) > MB_IN_BYTES ) { |
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return $content; |
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} |
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$tag_stack = array(); |
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$protected_tags = array( |
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'pre', |
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'code', |
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'textarea', |
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'style', |
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'a', |
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); |
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$content_with_links = ''; |
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$in_protected_tag = false; |
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foreach ( wp_html_split( $content ) as $chunk ) { |
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if ( preg_match( '#^<!--[\s\S]*-->$#i', $chunk, $m ) ) { |
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$content_with_links .= $chunk; |
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continue; |
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} |
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|
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if ( preg_match( '#^<(/)?([a-z-]+)\b[^>]*>$#i', $chunk, $m ) ) { |
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$tag = strtolower( $m[2] ); |
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if ( '/' === $m[1] ) { |
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// Closing tag. |
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$i = array_search( $tag, $tag_stack, true ); |
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// We can only remove the tag from the stack if it is in the stack. |
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if ( false !== $i ) { |
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$tag_stack = array_slice( $tag_stack, 0, $i ); |
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} |
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} else { |
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// Opening tag, add it to the stack. |
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$tag_stack[] = $tag; |
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} |
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|
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// If we're in a protected tag, the tag_stack contains at least one protected tag string. |
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// The protected tag state can only change when we encounter a start or end tag. |
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$in_protected_tag = array_intersect( $tag_stack, $protected_tags ); |
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|
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// Never inspect tags. |
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$content_with_links .= $chunk; |
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continue; |
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} |
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|
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if ( $in_protected_tag ) { |
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// Don't inspect a chunk inside an inspected tag. |
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$content_with_links .= $chunk; |
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continue; |
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} |
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|
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// Only reachable when there is no protected tag in the stack. |
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$content_with_links .= \preg_replace_callback( $regex, $regex_callback, $chunk ); |
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} |
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|
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return $content_with_links; |
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} |
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|
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/** |
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* Get an ActivityPub embed HTML for a URL. |
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* |
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* @param string $url The URL to get the embed for. |
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* @param boolean $inline_css Whether to inline CSS. Default true. |
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* |
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* @return string|false The embed HTML or false if not found. |
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*/ |
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function get_embed_html( $url, $inline_css = true ) { |
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return Embed::get_html( $url, $inline_css ); |
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} |
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|
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/** |
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* Get the client IP address for rate-limiting purposes. |
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* |
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* Walks the ordered list of $_SERVER keys returned by the |
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* `activitypub_client_ip_sources` filter (default: `['REMOTE_ADDR']`) and |
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* returns the first value that parses as a valid IP literal, validated via |
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* `filter_var( ..., FILTER_VALIDATE_IP )`. The result can be overridden |
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* outright via the `activitypub_client_ip` filter; that filter's output is |
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* also validated and replaced with `''` when it isn't a valid IP, so a |
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* misbehaving filter can't collide all callers into the same rate-limit |
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* bucket. |
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* |
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* Trusting any source other than `REMOTE_ADDR` is only safe behind a |
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* reverse proxy that sets and overwrites the corresponding header — see |
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* the `activitypub_client_ip_sources` filter docblock for guidance. |
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* |
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* Callers using the return value as a rate-limit key should treat an |
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* empty return as "client unidentifiable" and fail closed rather than |
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* share a single bucket across every such request. |
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* |
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* @since 8.1.0 |
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* |
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* @return string A valid IP address, or '' when no IP could be determined. |
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*/ |
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function get_client_ip() { |
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// phpcs:disable WordPressVIPMinimum.Variables.ServerVariables.UserControlledHeaders |
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$ip = ''; |
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|
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/** |
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* Filter the ordered list of $_SERVER keys to consult as a source for the |
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* client IP. The first key whose value parses as a valid IP wins. |
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* |
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* Default: array( 'REMOTE_ADDR' ) — the actual TCP peer, the only value |
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* that an HTTP client cannot spoof. Trusting any other $_SERVER key is |
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* only safe when a reverse proxy in front of the site sets that key and |
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* overwrites any client-supplied version; otherwise an attacker can spoof |
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* the value and bypass the per-IP rate limits that depend on it. |
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* |
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* Common operator overrides: |
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* array( 'HTTP_CF_CONNECTING_IP' ) on Cloudflare. |
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* array( 'HTTP_TRUE_CLIENT_IP', 'REMOTE_ADDR' ) Akamai with a fallback. |
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* array( 'HTTP_X_REAL_IP' ) nginx that strips the client copy. |
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* |
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* X-Forwarded-For pitfall: even with a trusted proxy, an attacker can |
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* prepend their own value before the proxy appends the real client IP. |
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* This helper takes the leftmost entry, which is correct only when the |
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* trusted proxy fully overwrites the header. If you trust X-Forwarded-For |
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* end-to-end, prefer to resolve from the right by your known proxy count |
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* via the activitypub_client_ip filter. |
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* |
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* @since 8.2.0 |
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* |
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* @param string[] $sources $_SERVER keys to consult, in priority order. |
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*/ |
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$sources = \apply_filters( 'activitypub_client_ip_sources', array( 'REMOTE_ADDR' ) ); |
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|
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if ( ! \is_array( $sources ) ) { |
| 383 |
$sources = array( 'REMOTE_ADDR' ); |
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} |
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|
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foreach ( $sources as $source ) { |
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if ( ! \is_string( $source ) || empty( $_SERVER[ $source ] ) ) { |
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continue; |
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} |
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|
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// Some headers (e.g. X-Forwarded-For) may contain a comma-separated list; use the first IP. |
| 392 |
$ip_list = \sanitize_text_field( \wp_unslash( $_SERVER[ $source ] ) ); |
| 393 |
$candidate = \trim( \explode( ',', $ip_list )[0] ); |
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|
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if ( \filter_var( $candidate, FILTER_VALIDATE_IP ) ) { |
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$ip = $candidate; |
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break; |
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} |
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} |
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// phpcs:enable WordPressVIPMinimum.Variables.ServerVariables.UserControlledHeaders |
| 401 |
|
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/** |
| 403 |
* Filter the client IP address used for rate limiting. |
| 404 |
* |
| 405 |
* @since 8.1.0 |
| 406 |
* |
| 407 |
* @param string $ip The detected client IP address (empty when none could be determined). |
| 408 |
*/ |
| 409 |
$ip = \apply_filters( 'activitypub_client_ip', $ip ); |
| 410 |
|
| 411 |
// Tolerate surrounding whitespace from filter callbacks; FILTER_VALIDATE_IP would otherwise reject it. |
| 412 |
if ( \is_string( $ip ) ) { |
| 413 |
$ip = \trim( $ip ); |
| 414 |
} |
| 415 |
|
| 416 |
// Re-validate so a misbehaving filter can't return a sentinel string that would collapse all callers into one bucket. |
| 417 |
return \is_string( $ip ) && \filter_var( $ip, FILTER_VALIDATE_IP ) ? $ip : ''; |
| 418 |
} |
| 419 |
|
