1<?php
  2/**
  3 * Gets the email message from the user's mailbox to add as
  4 * a WordPress post. Mailbox connection information must be
  5 * configured under Settings > Writing
  6 *
  7 * @package WordPress
  8 */
  9
 10/** Make sure that the WordPress bootstrap has run before continuing. */
 11require __DIR__ . '/wp-load.php';
 12
 13/** This filter is documented in wp-admin/options.php */
 14if ( ! apply_filters( 'enable_post_by_email_configuration', true ) ) {
 15	wp_die( __( 'This action has been disabled by the administrator.' ), 403 );
 16}
 17
 18$mailserver_url = get_option( 'mailserver_url' );
 19
 20if ( empty( $mailserver_url ) || 'mail.example.com' === $mailserver_url ) {
 21	wp_die( __( 'This action has been disabled by the administrator.' ), 403 );
 22}
 23
 24/**
 25 * Fires to allow a plugin to do a complete takeover of Post by Email.
 26 *
 27 * @since 2.9.0
 28 */
 29do_action( 'wp-mail.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
 30
 31/** Get the POP3 class with which to access the mailbox. */
 32require_once ABSPATH . WPINC . '/class-pop3.php';
 33
 34/** Only check at this interval for new messages. */
 35if ( ! defined( 'WP_MAIL_INTERVAL' ) ) {
 36	define( 'WP_MAIL_INTERVAL', 5 * MINUTE_IN_SECONDS );
 37}
 38
 39$last_checked = get_transient( 'mailserver_last_checked' );
 40
 41if ( $last_checked ) {
 42	wp_die(
 43		sprintf(
 44			// translators: %s human readable rate limit.
 45			__( 'Email checks are rate limited to once every %s.' ),
 46			human_time_diff( time() - WP_MAIL_INTERVAL, time() )
 47		),
 48		__( 'Slow down, no need to check for new mails so often!' ),
 49		429
 50	);
 51}
 52
 53set_transient( 'mailserver_last_checked', true, WP_MAIL_INTERVAL );
 54
 55$time_difference = (int) ( (float) get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
 56
 57$phone_delim = '::';
 58
 59$pop3 = new POP3();
 60
 61if ( ! $pop3->connect( get_option( 'mailserver_url' ), get_option( 'mailserver_port' ) ) || ! $pop3->user( get_option( 'mailserver_login' ) ) ) {
 62	wp_die( esc_html( $pop3->ERROR ) );
 63}
 64
 65$count = $pop3->pass( get_option( 'mailserver_pass' ) );
 66
 67if ( false === $count ) {
 68	wp_die( esc_html( $pop3->ERROR ) );
 69}
 70
 71if ( 0 === $count ) {
 72	$pop3->quit();
 73	wp_die( __( 'There does not seem to be any new mail.' ) );
 74}
 75
 76// Always run as an unauthenticated user.
 77wp_set_current_user( 0 );
 78
 79for ( $i = 1; $i <= $count; $i++ ) {
 80
 81	$message = $pop3->get( $i );
 82
 83	$bodysignal                = false;
 84	$boundary                  = '';
 85	$charset                   = '';
 86	$content                   = '';
 87	$content_type              = '';
 88	$content_transfer_encoding = '';
 89	$post_author               = 1;
 90	$author_found              = false;
 91	$post_date                 = null;
 92	$post_date_gmt             = null;
 93
 94	foreach ( $message as $line ) {
 95		// Body signal.
 96		if ( strlen( $line ) < 3 ) {
 97			$bodysignal = true;
 98		}
 99		if ( $bodysignal ) {
100			$content .= $line;
101		} else {
102			if ( preg_match( '/Content-Type: /i', $line ) ) {
103				$content_type = trim( $line );
104				$content_type = substr( $content_type, 14, strlen( $content_type ) - 14 );
105				$content_type = explode( ';', $content_type );
106				if ( ! empty( $content_type[1] ) ) {
107					$charset = explode( '=', $content_type[1] );
108					$charset = ( ! empty( $charset[1] ) ) ? trim( $charset[1] ) : '';
109				}
110				$content_type = $content_type[0];
111			}
112			if ( preg_match( '/Content-Transfer-Encoding: /i', $line ) ) {
113				$content_transfer_encoding = trim( $line );
114				$content_transfer_encoding = substr( $content_transfer_encoding, 27, strlen( $content_transfer_encoding ) - 27 );
115				$content_transfer_encoding = explode( ';', $content_transfer_encoding );
116				$content_transfer_encoding = $content_transfer_encoding[0];
117			}
118			if ( 'multipart/alternative' === $content_type && str_contains( $line, 'boundary="' ) && '' === $boundary ) {
119				$boundary = trim( $line );
120				$boundary = explode( '"', $boundary );
121				$boundary = $boundary[1];
122			}
123			if ( preg_match( '/Subject: /i', $line ) ) {
124				$subject = trim( $line );
125				$subject = substr( $subject, 9, strlen( $subject ) - 9 );
126				// Captures any text in the subject before $phone_delim as the subject.
127				if ( function_exists( 'iconv_mime_decode' ) ) {
128					$subject = iconv_mime_decode( $subject, 2, get_option( 'blog_charset' ) );
129				} else {
130					$subject = wp_iso_descrambler( $subject );
131				}
132				$subject = explode( $phone_delim, $subject );
133				$subject = $subject[0];
134			}
135
136			/*
137			 * Set the author using the email address (From or Reply-To, the last used)
138			 * otherwise use the site admin.
139			 */
140			if ( ! $author_found && preg_match( '/^(From|Reply-To): /', $line ) ) {
141				if ( preg_match( '|[a-z0-9_.-]+@[a-z0-9_.-]+(?!.*<)|i', $line, $matches ) ) {
142					$author = $matches[0];
143				} else {
144					$author = trim( $line );
145				}
146				$author = sanitize_email( $author );
147				if ( is_email( $author ) ) {
148					$userdata = get_user_by( 'email', $author );
149					if ( ! empty( $userdata ) ) {
150						$post_author  = $userdata->ID;
151						$author_found = true;
152					}
153				}
154			}
155
156			if ( preg_match( '/Date: /i', $line ) ) { // Of the form '20 Mar 2002 20:32:37 +0100'.
157				$ddate = str_replace( 'Date: ', '', trim( $line ) );
158				// Remove parenthesized timezone string if it exists, as this confuses strtotime().
159				$ddate           = preg_replace( '!\s*\(.+\)\s*$!', '', $ddate );
160				$ddate_timestamp = strtotime( $ddate );
161				$post_date       = gmdate( 'Y-m-d H:i:s', $ddate_timestamp + $time_difference );
162				$post_date_gmt   = gmdate( 'Y-m-d H:i:s', $ddate_timestamp );
163			}
164		}
165	}
166
167	// Set $post_status based on $author_found and on author's publish_posts capability.
168	if ( $author_found ) {
169		$user        = new WP_User( $post_author );
170		$post_status = ( $user->has_cap( 'publish_posts' ) ) ? 'publish' : 'pending';
171	} else {
172		// Author not found in DB, set status to pending. Author already set to admin.
173		$post_status = 'pending';
174	}
175
176	$subject = trim( $subject );
177
178	if ( 'multipart/alternative' === $content_type ) {
179		$content = explode( '--' . $boundary, $content );
180		$content = $content[2];
181
182		// Match case-insensitive Content-Transfer-Encoding.
183		if ( preg_match( '/Content-Transfer-Encoding: quoted-printable/i', $content, $delim ) ) {
184			$content = explode( $delim[0], $content );
185			$content = $content[1];
186		}
187		$content = strip_tags( $content, '<img><p><br><i><b><u><em><strong><strike><font><span><div>' );
188	}
189	$content = trim( $content );
190
191	/**
192	 * Filters the original content of the email.
193	 *
194	 * Give Post-By-Email extending plugins full access to the content, either
195	 * the raw content, or the content of the last quoted-printable section.
196	 *
197	 * @since 2.8.0
198	 *
199	 * @param string $content The original email content.
200	 */
201	$content = apply_filters( 'wp_mail_original_content', $content );
202
203	if ( false !== stripos( $content_transfer_encoding, 'quoted-printable' ) ) {
204		$content = quoted_printable_decode( $content );
205	}
206
207	if ( function_exists( 'iconv' ) && ! empty( $charset ) ) {
208		$content = iconv( $charset, get_option( 'blog_charset' ), $content );
209	}
210
211	// Captures any text in the body after $phone_delim as the body.
212	$content = explode( $phone_delim, $content );
213	$content = empty( $content[1] ) ? $content[0] : $content[1];
214
215	$content = trim( $content );
216
217	/**
218	 * Filters the content of the post submitted by email before saving.
219	 *
220	 * @since 1.2.0
221	 *
222	 * @param string $content The email content.
223	 */
224	$post_content = apply_filters( 'phone_content', $content );
225
226	$post_title = xmlrpc_getposttitle( $content );
227
228	if ( '' === trim( $post_title ) ) {
229		$post_title = $subject;
230	}
231
232	$post_category = array( get_option( 'default_email_category' ) );
233
234	$post_data = compact( 'post_content', 'post_title', 'post_date', 'post_date_gmt', 'post_author', 'post_category', 'post_status' );
235	$post_data = wp_slash( $post_data );
236
237	$post_ID = wp_insert_post( $post_data );
238	if ( is_wp_error( $post_ID ) ) {
239		echo "\n" . $post_ID->get_error_message();
240	}
241
242	// The post wasn't inserted or updated, for whatever reason. Better move forward to the next email.
243	if ( empty( $post_ID ) ) {
244		continue;
245	}
246
247	/**
248	 * Fires after a post submitted by email is published.
249	 *
250	 * @since 1.2.0
251	 *
252	 * @param int $post_ID The post ID.
253	 */
254	do_action( 'publish_phone', $post_ID );
255
256	echo "\n<p><strong>" . __( 'Author:' ) . '</strong> ' . esc_html( $post_author ) . '</p>';
257	echo "\n<p><strong>" . __( 'Posted title:' ) . '</strong> ' . esc_html( $post_title ) . '</p>';
258
259	if ( ! $pop3->delete( $i ) ) {
260		echo '<p>' . sprintf(
261			/* translators: %s: POP3 error. */
262			__( 'Oops: %s' ),
263			esc_html( $pop3->ERROR )
264		) . '</p>';
265		$pop3->reset();
266		exit;
267	} else {
268		echo '<p>' . sprintf(
269			/* translators: %s: The message ID. */
270			__( 'Mission complete. Message %s deleted.' ),
271			'<strong>' . $i . '</strong>'
272		) . '</p>';
273	}
274}
275
276$pop3->quit();
277