WordPress/wp-mail.php
John Blackbourn 07f3c35467 General: Fix code quality issues which were identified by static analysis.
This fixes minor issues that could cause PHP notices under the right conditions, and fixes some general incorrectness.

Props jrf, hellofromTonya for review

See #52217

Built from https://develop.svn.wordpress.org/trunk@51850


git-svn-id: http://core.svn.wordpress.org/trunk@51449 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-09-22 21:01:00 +00:00

268 lines
8.4 KiB
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 __DIR__ . '/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' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
/** 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', 5 * MINUTE_IN_SECONDS );
}
$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;
$post_date = null;
$post_date_gmt = null;
foreach ( $message as $line ) {
// 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 ( ( 'multipart/alternative' === $content_type ) && ( 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: %s: 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 ) );
// Remove parenthesised timezone string if it exists, as this confuses strtotime().
$ddate = preg_replace( '!\s*\(.+\)\s*$!', '', $ddate );
$ddate_timestamp = strtotime( $ddate );
$post_date = gmdate( 'Y-m-d H:i:s', $ddate_timestamp + $time_difference );
$post_date_gmt = gmdate( 'Y-m-d H:i:s', $ddate_timestamp );
}
}
}
// 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 ( 'multipart/alternative' === $content_type ) {
$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 ( '' === trim( $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();