<?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 = (int) ( (float) 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 does not seem to be any new mail.' ) );
}

// Always run as an unauthenticated user.
wp_set_current_user( 0 );

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 && str_contains( $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 ) ) {
$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 parenthesized 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();
}

// The post wasn't inserted or updated, 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();