ntwb / wordpress

src/wp-mail.php

<?php
/**
 * Gets the email message from the user's mailbox to add as
 * a WordPress post. Mailbox connection information must be
 * configured under Settings > Writing
 *
 * @package WordPress
 */

/** Make sure that the WordPress bootstrap has run before continuing. */
require(dirname(__FILE__) . '/wp-load.php');

/** This filter is documented in wp-admin/options.php */
if ( ! apply_filters( 'enable_post_by_email_configuration', true ) )
	wp_die( __( 'This action has been disabled by the administrator.' ), 403 );

$mailserver_url = get_option( 'mailserver_url' );

if ( 'mail.example.com' === $mailserver_url || empty( $mailserver_url ) ) {
	wp_die( __( 'This action has been disabled by the administrator.' ), 403 );
}

/**
 * Fires to allow a plugin to do a complete takeover of Post by Email.
 *
 * @since 2.9.0
 */
do_action( 'wp-mail.php' );

/** Get the POP3 class with which to access the mailbox. */
require_once( ABSPATH . WPINC . '/class-pop3.php' );

/** Only check at this interval for new messages. */
if ( !defined('WP_MAIL_INTERVAL') )
	define('WP_MAIL_INTERVAL', 300); // 5 minutes

$last_checked = get_transient('mailserver_last_checked');

if ( $last_checked )
	wp_die(__('Slow down cowboy, no need to check for new mails so often!'));

set_transient('mailserver_last_checked', true, WP_MAIL_INTERVAL);

$time_difference = get_option('gmt_offset') * HOUR_IN_SECONDS;

$phone_delim = '::';

$pop3 = new POP3();

if ( !$pop3->connect( get_option('mailserver_url'), get_option('mailserver_port') ) || !$pop3->user( get_option('mailserver_login') ) )
	wp_die( esc_html( $pop3->ERROR ) );

$count = $pop3->pass( get_option('mailserver_pass') );

if( false === $count )
	wp_die( esc_html( $pop3->ERROR ) );

if( 0 === $count ) {
	$pop3->quit();
	wp_die( __('There doesn&#8217;t seem to be any new mail.') );
}

for ( $i = 1; $i <= $count; $i++ ) {

	$message = $pop3->get($i);

	$bodysignal = false;
	$boundary = '';
	$charset = '';
	$content = '';
	$content_type = '';
	$content_transfer_encoding = '';
	$post_author = 1;
	$author_found = false;
	foreach ($message as $line) {

The expression $message of type false|array is not guaranteed to be traversable. How about adding an additional type check?

		// Body signal.
		if ( strlen($line) < 3 )
			$bodysignal = true;
		if ( $bodysignal ) {
			$content .= $line;
		} else {
			if ( preg_match('/Content-Type: /i', $line) ) {
				$content_type = trim($line);
				$content_type = substr($content_type, 14, strlen($content_type) - 14);
				$content_type = explode(';', $content_type);
				if ( ! empty( $content_type[1] ) ) {
					$charset = explode('=', $content_type[1]);
					$charset = ( ! empty( $charset[1] ) ) ? trim($charset[1]) : '';
				}
				$content_type = $content_type[0];
			}
			if ( preg_match('/Content-Transfer-Encoding: /i', $line) ) {
				$content_transfer_encoding = trim($line);
				$content_transfer_encoding = substr($content_transfer_encoding, 27, strlen($content_transfer_encoding) - 27);
				$content_transfer_encoding = explode(';', $content_transfer_encoding);
				$content_transfer_encoding = $content_transfer_encoding[0];
			}
			if ( ( $content_type == 'multipart/alternative' ) && ( false !== strpos($line, 'boundary="') ) && ( '' == $boundary ) ) {
				$boundary = trim($line);
				$boundary = explode('"', $boundary);
				$boundary = $boundary[1];
			}
			if (preg_match('/Subject: /i', $line)) {
				$subject = trim($line);
				$subject = substr($subject, 9, strlen($subject) - 9);
				// Captures any text in the subject before $phone_delim as the subject
				if ( function_exists('iconv_mime_decode') ) {
					$subject = iconv_mime_decode($subject, 2, get_option('blog_charset'));
				} else {
					$subject = wp_iso_descrambler($subject);
				}
				$subject = explode($phone_delim, $subject);
				$subject = $subject[0];
			}

			/*
			 * Set the author using the email address (From or Reply-To, the last used)
			 * otherwise use the site admin.
			 */
			if ( ! $author_found && preg_match( '/^(From|Reply-To): /', $line ) ) {
				if ( preg_match('|[a-z0-9_.-]+@[a-z0-9_.-]+(?!.*<)|i', $line, $matches) )
					$author = $matches[0];
				else
					$author = trim($line);
				$author = sanitize_email($author);
				if ( is_email($author) ) {
					/* translators: Post author email address */
					echo '<p>' . sprintf(__('Author is %s'), $author) . '</p>';
					$userdata = get_user_by('email', $author);
					if ( ! empty( $userdata ) ) {
						$post_author = $userdata->ID;
						$author_found = true;
					}
				}
			}

			if ( preg_match( '/Date: /i', $line ) ) { // of the form '20 Mar 2002 20:32:37 +0100'
				$ddate = str_replace( 'Date: ', '', trim( $line ) );
				$ddate = preg_replace( '!\s*\(.+\)\s*$!', '', $ddate );	// remove parenthesised timezone string if it exists, as this confuses strtotime
				$ddate_U = strtotime( $ddate );
				$post_date = gmdate( 'Y-m-d H:i:s', $ddate_U + $time_difference );
				$post_date_gmt = gmdate( 'Y-m-d H:i:s', $ddate_U );
			}
		}
	}

	// Set $post_status based on $author_found and on author's publish_posts capability
	if ( $author_found ) {
		$user = new WP_User($post_author);
		$post_status = ( $user->has_cap('publish_posts') ) ? 'publish' : 'pending';
	} else {
		// Author not found in DB, set status to pending. Author already set to admin.
		$post_status = 'pending';
	}

	$subject = trim($subject);

	if ( $content_type == 'multipart/alternative' ) {
		$content = explode('--'.$boundary, $content);
		$content = $content[2];

		// Match case-insensitive content-transfer-encoding.
		if ( preg_match( '/Content-Transfer-Encoding: quoted-printable/i', $content, $delim) ) {
			$content = explode($delim[0], $content);
			$content = $content[1];
		}
		$content = strip_tags($content, '<img><p><br><i><b><u><em><strong><strike><font><span><div>');
	}
	$content = trim($content);

	/**
	 * Filters the original content of the email.
	 *
	 * Give Post-By-Email extending plugins full access to the content, either
	 * the raw content, or the content of the last quoted-printable section.
	 *
	 * @since 2.8.0
	 *
	 * @param string $content The original email content.
	 */
	$content = apply_filters( 'wp_mail_original_content', $content );

	if ( false !== stripos($content_transfer_encoding, "quoted-printable") ) {
		$content = quoted_printable_decode($content);
	}

	if ( function_exists('iconv') && ! empty( $charset ) ) {
		$content = iconv($charset, get_option('blog_charset'), $content);
	}

	// Captures any text in the body after $phone_delim as the body
	$content = explode($phone_delim, $content);
	$content = empty( $content[1] ) ? $content[0] : $content[1];

	$content = trim($content);

	/**
	 * Filters the content of the post submitted by email before saving.
	 *
	 * @since 1.2.0
	 *
	 * @param string $content The email content.
	 */
	$post_content = apply_filters( 'phone_content', $content );

	$post_title = xmlrpc_getposttitle($content);

	if ($post_title == '') $post_title = $subject;

	$post_category = array(get_option('default_email_category'));

	$post_data = compact('post_content','post_title','post_date','post_date_gmt','post_author','post_category', 'post_status');
	$post_data = wp_slash($post_data);

	$post_ID = wp_insert_post($post_data);
	if ( is_wp_error( $post_ID ) )
		echo "\n" . $post_ID->get_error_message();

	// We couldn't post, for whatever reason. Better move forward to the next email.
	if ( empty( $post_ID ) )
		continue;

	/**
	 * Fires after a post submitted by email is published.
	 *
	 * @since 1.2.0
	 *
	 * @param int $post_ID The post ID.
	 */
	do_action( 'publish_phone', $post_ID );

	echo "\n<p><strong>" . __( 'Author:' ) . '</strong> ' . esc_html( $post_author ) . '</p>';
	echo "\n<p><strong>" . __( 'Posted title:' ) . '</strong> ' . esc_html( $post_title ) . '</p>';

	if(!$pop3->delete($i)) {
		echo '<p>' . sprintf(
			/* translators: %s: POP3 error */
			__( 'Oops: %s' ),
			esc_html( $pop3->ERROR )
		) . '</p>';
		$pop3->reset();
		exit;
	} else {
		echo '<p>' . sprintf(
			/* translators: %s: the message ID */
			__( 'Mission complete. Message %s deleted.' ),
			'<strong>' . $i . '</strong>'
		) . '</p>';
	}

}

$pop3->quit();