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   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. */
  11  require  __DIR__ . '/wp-load.php';
  12  
  13  /** This filter is documented in wp-admin/options.php */
  14  if ( ! 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  
  20  if ( 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   */
  29  do_action( 'wp-mail.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
  30  
  31  /** Get the POP3 class with which to access the mailbox. */
  32  require_once ABSPATH . WPINC . '/class-pop3.php';
  33  
  34  /** Only check at this interval for new messages. */
  35  if ( ! defined( 'WP_MAIL_INTERVAL' ) ) {
  36      define( 'WP_MAIL_INTERVAL', 5 * MINUTE_IN_SECONDS );
  37  }
  38  
  39  $last_checked = get_transient( 'mailserver_last_checked' );
  40  
  41  if ( $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  
  53  set_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  
  61  if ( ! $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  
  67  if ( false === $count ) {
  68      wp_die( esc_html( $pop3->ERROR ) );
  69  }
  70  
  71  if ( 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.
  77  wp_set_current_user( 0 );
  78  
  79  for ( $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();