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<?php

class Akismet {
	const API_HOST = 'rest.akismet.com';
	const API_PORT = 80;
	const MAX_DELAY_BEFORE_MODERATION_EMAIL = 86400; // One day in seconds

public static $limit_notices = array(
		10501 => 'FIRST_MONTH_OVER_LIMIT',
		10502 => 'SECOND_MONTH_OVER_LIMIT',
		10504 => 'THIRD_MONTH_APPROACHING_LIMIT',
		10508 => 'THIRD_MONTH_OVER_LIMIT',
		10516 => 'FOUR_PLUS_MONTHS_OVER_LIMIT',
	);

private static $last_comment = '';
	private static $initiated = false;
	private static $prevent_moderation_email_for_these_comments = array();
	private static $last_comment_result = null;
	private static $comment_as_submitted_allowed_keys = array( 'blog' => '', 'blog_charset' => '', 'blog_lang' => '', 'blog_ua' => '', 'comment_agent' => '', 'comment_author' => '', 'comment_author_IP' => '', 'comment_author_email' => '', 'comment_author_url' => '', 'comment_content' => '', 'comment_date_gmt' => '', 'comment_tags' => '', 'comment_type' => '', 'guid' => '', 'is_test' => '', 'permalink' => '', 'reporter' => '', 'site_domain' => '', 'submit_referer' => '', 'submit_uri' => '', 'user_ID' => '', 'user_agent' => '', 'user_id' => '', 'user_ip' => '' );
	
	public static function init() {
		if ( ! self::$initiated ) {
			self::init_hooks();
		}
	}

/**
	 * Initializes WordPress hooks
	 */
	private static function init_hooks() {
		self::$initiated = true;

add_action( 'wp_insert_comment', array( 'Akismet', 'auto_check_update_meta' ), 10, 2 );
		add_filter( 'preprocess_comment', array( 'Akismet', 'auto_check_comment' ), 1 );
		add_filter( 'rest_pre_insert_comment', array( 'Akismet', 'rest_auto_check_comment' ), 1 );

add_action( 'comment_form', array( 'Akismet', 'load_form_js' ) );
		add_action( 'do_shortcode_tag', array( 'Akismet', 'load_form_js_via_filter' ), 10, 4 );

add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments' ) );
		add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_old_comments_meta' ) );
		add_action( 'akismet_scheduled_delete', array( 'Akismet', 'delete_orphaned_commentmeta' ) );
		add_action( 'akismet_schedule_cron_recheck', array( 'Akismet', 'cron_recheck' ) );

add_action( 'comment_form',  array( 'Akismet',  'add_comment_nonce' ), 1 );
		add_action( 'comment_form', array( 'Akismet', 'output_custom_form_fields' ) );
		add_filter( 'script_loader_tag', array( 'Akismet', 'set_form_js_async' ), 10, 3 );

add_filter( 'comment_moderation_recipients', array( 'Akismet', 'disable_moderation_emails_if_unreachable' ), 1000, 2 );
		add_filter( 'pre_comment_approved', array( 'Akismet', 'last_comment_status' ), 10, 2 );
		
		add_action( 'transition_comment_status', array( 'Akismet', 'transition_comment_status' ), 10, 3 );

// Run this early in the pingback call, before doing a remote fetch of the source uri
		add_action( 'xmlrpc_call', array( 'Akismet', 'pre_check_pingback' ) );

// Jetpack compatibility
		add_filter( 'jetpack_options_whitelist', array( 'Akismet', 'add_to_jetpack_options_whitelist' ) );
		add_filter( 'jetpack_contact_form_html', array( 'Akismet', 'inject_custom_form_fields' ) );
		add_filter( 'jetpack_contact_form_akismet_values', array( 'Akismet', 'prepare_custom_form_values' ) );

// Gravity Forms
		add_filter( 'gform_get_form_filter', array( 'Akismet', 'inject_custom_form_fields' ) );
		add_filter( 'gform_akismet_fields', array( 'Akismet', 'prepare_custom_form_values' ) );

// Contact Form 7
		add_filter( 'wpcf7_form_elements', array( 'Akismet', 'append_custom_form_fields' ) );
		add_filter( 'wpcf7_akismet_parameters', array( 'Akismet', 'prepare_custom_form_values' ) );

// Formidable Forms
		add_filter( 'frm_filter_final_form', array( 'Akismet', 'inject_custom_form_fields' ) );
		add_filter( 'frm_akismet_values', array( 'Akismet', 'prepare_custom_form_values' ) );

// Fluent Forms
		add_filter( 'fluentform_form_element_start', array( 'Akismet', 'output_custom_form_fields' ) );
		add_filter( 'fluentform_akismet_fields', array( 'Akismet', 'prepare_custom_form_values' ), 10, 2 );

add_action( 'update_option_wordpress_api_key', array( 'Akismet', 'updated_option' ), 10, 2 );
		add_action( 'add_option_wordpress_api_key', array( 'Akismet', 'added_option' ), 10, 2 );

add_action( 'comment_form_after',  array( 'Akismet',  'display_comment_form_privacy_notice' ) );
	}

public static function get_api_key() {
		return apply_filters( 'akismet_get_api_key', defined('WPCOM_API_KEY') ? constant('WPCOM_API_KEY') : get_option('wordpress_api_key') );
	}

public static function check_key_status( $key, $ip = null ) {
		return self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option( 'home' ) ) ), 'verify-key', $ip );
	}

public static function verify_key( $key, $ip = null ) {
		// Shortcut for obviously invalid keys.
		if ( strlen( $key ) != 12 ) {
			return 'invalid';
		}
		
		$response = self::check_key_status( $key, $ip );

if ( $response[1] != 'valid' && $response[1] != 'invalid' )
			return 'failed';

return $response[1];
	}

public static function deactivate_key( $key ) {
		$response = self::http_post( Akismet::build_query( array( 'key' => $key, 'blog' => get_option( 'home' ) ) ), 'deactivate' );

if ( $response[1] != 'deactivated' )
			return 'failed';

return $response[1];
	}

/**
	 * Add the akismet option to the Jetpack options management whitelist.
	 *
	 * @param array $options The list of whitelisted option names.
	 * @return array The updated whitelist
	 */
	public static function add_to_jetpack_options_whitelist( $options ) {
		$options[] = 'wordpress_api_key';
		return $options;
	}

/**
	 * When the akismet option is updated, run the registration call.
	 *
	 * This should only be run when the option is updated from the Jetpack/WP.com
	 * API call, and only if the new key is different than the old key.
	 *
	 * @param mixed  $old_value   The old option value.
	 * @param mixed  $value       The new option value.
	 */
	public static function updated_option( $old_value, $value ) {
		// Not an API call
		if ( ! class_exists( 'WPCOM_JSON_API_Update_Option_Endpoint' ) ) {
			return;
		}
		// Only run the registration if the old key is different.
		if ( $old_value !== $value ) {
			self::verify_key( $value );
		}
	}
	
	/**
	 * Treat the creation of an API key the same as updating the API key to a new value.
	 *
	 * @param mixed  $option_name   Will always be "wordpress_api_key", until something else hooks in here.
	 * @param mixed  $value         The option value.
	 */
	public static function added_option( $option_name, $value ) {
		if ( 'wordpress_api_key' === $option_name ) {
			return self::updated_option( '', $value );
		}
	}
	
	public static function rest_auto_check_comment( $commentdata ) {
		return self::auto_check_comment( $commentdata, 'rest_api' );
	}

/**
	 * Check a comment for spam.
	 *
	 * @param array $commentdata
	 * @param string $context What kind of request triggered this comment check? Possible values are 'default', 'rest_api', and 'xml-rpc'.
	 * @return array|WP_Error Either the $commentdata array with additional entries related to its spam status
	 *                        or a WP_Error, if it's a REST API request and the comment should be discarded.
	 */
	public static function auto_check_comment( $commentdata, $context = 'default' ) {
		// If no key is configured, then there's no point in doing any of this.
		if ( ! self::get_api_key() ) {
			return $commentdata;
		}

self::$last_comment_result = null;

$comment = $commentdata;

$comment['user_ip']      = self::get_ip_address();
		$comment['user_agent']   = self::get_user_agent();
		$comment['referrer']     = self::get_referer();
		$comment['blog']         = get_option( 'home' );
		$comment['blog_lang']    = get_locale();
		$comment['blog_charset'] = get_option('blog_charset');
		$comment['permalink']    = get_permalink( $comment['comment_post_ID'] );

if ( ! empty( $comment['user_ID'] ) ) {
			$comment['user_role'] = Akismet::get_user_roles( $comment['user_ID'] );
		}

/** See filter documentation in init_hooks(). */
		$akismet_nonce_option = apply_filters( 'akismet_comment_nonce', get_option( 'akismet_comment_nonce' ) );
		$comment['akismet_comment_nonce']