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<?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 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 ) && ( 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 ) ) {
          $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();