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488 lines
15 KiB
PHP
488 lines
15 KiB
PHP
<?php
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/**
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+-----------------------------------------------------------------------+
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| program/include/rcube_mime.php |
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2005-2012, The Roundcube Dev Team |
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| Copyright (C) 2011-2012, Kolab Systems AG |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| PURPOSE: |
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| MIME message parsing utilities |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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| Author: Aleksander Machniak <alec@alec.pl> |
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+-----------------------------------------------------------------------+
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$Id$
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*/
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/**
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* Class for parsing MIME messages
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*
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* @package Mail
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* @author Thomas Bruederli <roundcube@gmail.com>
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* @author Aleksander Machniak <alec@alec.pl>
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*/
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class rcube_mime
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{
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private static $default_charset = RCMAIL_CHARSET;
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/**
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* Object constructor.
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*/
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function __construct($default_charset = null)
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{
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if ($default_charset) {
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self::$default_charset = $default_charset;
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}
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else {
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self::$default_charset = rcmail::get_instance()->config->get('default_charset', RCMAIL_CHARSET);
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}
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}
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/**
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* Split an address list into a structured array list
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*
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* @param string $input Input string
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* @param int $max List only this number of addresses
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* @param boolean $decode Decode address strings
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* @param string $fallback Fallback charset if none specified
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*
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* @return array Indexed list of addresses
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*/
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static function decode_address_list($input, $max = null, $decode = true, $fallback = null)
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{
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$a = self::parse_address_list($input, $decode, $fallback);
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$out = array();
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$j = 0;
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// Special chars as defined by RFC 822 need to in quoted string (or escaped).
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$special_chars = '[\(\)\<\>\\\.\[\]@,;:"]';
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if (!is_array($a))
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return $out;
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foreach ($a as $val) {
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$j++;
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$address = trim($val['address']);
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$name = trim($val['name']);
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if ($name && $address && $name != $address)
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$string = sprintf('%s <%s>', preg_match("/$special_chars/", $name) ? '"'.addcslashes($name, '"').'"' : $name, $address);
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else if ($address)
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$string = $address;
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else if ($name)
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$string = $name;
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$out[$j] = array(
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'name' => $name,
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'mailto' => $address,
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'string' => $string
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);
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if ($max && $j==$max)
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break;
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}
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return $out;
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}
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/**
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* Decode a message header value
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*
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* @param string $input Header value
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* @param string $fallback Fallback charset if none specified
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*
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* @return string Decoded string
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*/
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public static function decode_header($input, $fallback = null)
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{
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$str = self::decode_mime_string((string)$input, $fallback);
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return $str;
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}
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/**
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* Decode a mime-encoded string to internal charset
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*
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* @param string $input Header value
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* @param string $fallback Fallback charset if none specified
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*
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* @return string Decoded string
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*/
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public static function decode_mime_string($input, $fallback = null)
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{
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$default_charset = !empty($fallback) ? $fallback : self::$default_charset;
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// rfc: all line breaks or other characters not found
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// in the Base64 Alphabet must be ignored by decoding software
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// delete all blanks between MIME-lines, differently we can
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// receive unnecessary blanks and broken utf-8 symbols
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$input = preg_replace("/\?=\s+=\?/", '?==?', $input);
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// encoded-word regexp
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$re = '/=\?([^?]+)\?([BbQq])\?([^\n]*?)\?=/';
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// Find all RFC2047's encoded words
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if (preg_match_all($re, $input, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {
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// Initialize variables
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$tmp = array();
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$out = '';
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$start = 0;
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foreach ($matches as $idx => $m) {
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$pos = $m[0][1];
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$charset = $m[1][0];
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$encoding = $m[2][0];
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$text = $m[3][0];
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$length = strlen($m[0][0]);
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// Append everything that is before the text to be decoded
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if ($start != $pos) {
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$substr = substr($input, $start, $pos-$start);
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$out .= rcube_charset_convert($substr, $default_charset);
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$start = $pos;
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}
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$start += $length;
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// Per RFC2047, each string part "MUST represent an integral number
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// of characters . A multi-octet character may not be split across
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// adjacent encoded-words." However, some mailers break this, so we
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// try to handle characters spanned across parts anyway by iterating
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// through and aggregating sequential encoded parts with the same
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// character set and encoding, then perform the decoding on the
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// aggregation as a whole.
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$tmp[] = $text;
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if ($next_match = $matches[$idx+1]) {
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if ($next_match[0][1] == $start
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&& $next_match[1][0] == $charset
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&& $next_match[2][0] == $encoding
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) {
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continue;
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}
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}
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$count = count($tmp);
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$text = '';
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// Decode and join encoded-word's chunks
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if ($encoding == 'B' || $encoding == 'b') {
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// base64 must be decoded a segment at a time
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for ($i=0; $i<$count; $i++)
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$text .= base64_decode($tmp[$i]);
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}
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else { //if ($encoding == 'Q' || $encoding == 'q') {
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// quoted printable can be combined and processed at once
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for ($i=0; $i<$count; $i++)
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$text .= $tmp[$i];
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$text = str_replace('_', ' ', $text);
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$text = quoted_printable_decode($text);
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}
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$out .= rcube_charset_convert($text, $charset);
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$tmp = array();
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}
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// add the last part of the input string
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if ($start != strlen($input)) {
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$out .= rcube_charset_convert(substr($input, $start), $default_charset);
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}
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// return the results
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return $out;
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}
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// no encoding information, use fallback
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return rcube_charset_convert($input, $default_charset);
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}
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/**
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* Decode a mime part
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*
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* @param string $input Input string
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* @param string $encoding Part encoding
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* @return string Decoded string
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*/
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public static function decode($input, $encoding = '7bit')
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{
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switch (strtolower($encoding)) {
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case 'quoted-printable':
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return quoted_printable_decode($input);
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case 'base64':
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return base64_decode($input);
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case 'x-uuencode':
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case 'x-uue':
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case 'uue':
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case 'uuencode':
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return convert_uudecode($input);
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case '7bit':
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default:
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return $input;
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}
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}
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/**
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* Split RFC822 header string into an associative array
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* @access private
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*/
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public static function parse_headers($headers)
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{
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$a_headers = array();
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$headers = preg_replace('/\r?\n(\t| )+/', ' ', $headers);
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$lines = explode("\n", $headers);
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$c = count($lines);
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for ($i=0; $i<$c; $i++) {
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if ($p = strpos($lines[$i], ': ')) {
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$field = strtolower(substr($lines[$i], 0, $p));
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$value = trim(substr($lines[$i], $p+1));
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if (!empty($value))
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$a_headers[$field] = $value;
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}
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}
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return $a_headers;
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}
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/**
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* @access private
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*/
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private static function parse_address_list($str, $decode = true, $fallback = null)
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{
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// remove any newlines and carriage returns before
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$str = preg_replace('/\r?\n(\s|\t)?/', ' ', $str);
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// extract list items, remove comments
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$str = self::explode_header_string(',;', $str, true);
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$result = array();
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// simplified regexp, supporting quoted local part
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$email_rx = '(\S+|("\s*(?:[^"\f\n\r\t\v\b\s]+\s*)+"))@\S+';
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foreach ($str as $key => $val) {
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$name = '';
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$address = '';
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$val = trim($val);
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if (preg_match('/(.*)<('.$email_rx.')>$/', $val, $m)) {
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$address = $m[2];
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$name = trim($m[1]);
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}
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else if (preg_match('/^('.$email_rx.')$/', $val, $m)) {
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$address = $m[1];
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$name = '';
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}
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else {
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$name = $val;
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}
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// dequote and/or decode name
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if ($name) {
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if ($name[0] == '"' && $name[strlen($name)-1] == '"') {
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$name = substr($name, 1, -1);
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$name = stripslashes($name);
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}
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if ($decode) {
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$name = self::decode_header($name, $fallback);
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}
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}
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if (!$address && $name) {
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$address = $name;
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}
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if ($address) {
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$result[$key] = array('name' => $name, 'address' => $address);
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}
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}
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return $result;
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}
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/**
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* Explodes header (e.g. address-list) string into array of strings
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* using specified separator characters with proper handling
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* of quoted-strings and comments (RFC2822)
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*
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* @param string $separator String containing separator characters
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* @param string $str Header string
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* @param bool $remove_comments Enable to remove comments
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*
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* @return array Header items
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*/
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public static function explode_header_string($separator, $str, $remove_comments = false)
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{
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$length = strlen($str);
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$result = array();
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$quoted = false;
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$comment = 0;
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$out = '';
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for ($i=0; $i<$length; $i++) {
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// we're inside a quoted string
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if ($quoted) {
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if ($str[$i] == '"') {
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$quoted = false;
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}
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else if ($str[$i] == "\\") {
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if ($comment <= 0) {
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$out .= "\\";
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}
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$i++;
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}
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}
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// we are inside a comment string
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else if ($comment > 0) {
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if ($str[$i] == ')') {
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$comment--;
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}
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else if ($str[$i] == '(') {
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$comment++;
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}
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else if ($str[$i] == "\\") {
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$i++;
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}
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continue;
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}
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// separator, add to result array
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else if (strpos($separator, $str[$i]) !== false) {
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if ($out) {
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$result[] = $out;
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}
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$out = '';
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continue;
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}
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// start of quoted string
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else if ($str[$i] == '"') {
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$quoted = true;
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}
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// start of comment
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else if ($remove_comments && $str[$i] == '(') {
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$comment++;
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}
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if ($comment <= 0) {
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$out .= $str[$i];
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}
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}
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if ($out && $comment <= 0) {
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$result[] = $out;
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}
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return $result;
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}
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/**
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* Interpret a format=flowed message body according to RFC 2646
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*
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* @param string $text Raw body formatted as flowed text
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*
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* @return string Interpreted text with unwrapped lines and stuffed space removed
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*/
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public static function unfold_flowed($text)
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{
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$text = preg_split('/\r?\n/', $text);
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$last = -1;
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$q_level = 0;
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foreach ($text as $idx => $line) {
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if ($line[0] == '>' && preg_match('/^(>+\s*)/', $line, $regs)) {
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$q = strlen(str_replace(' ', '', $regs[0]));
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$line = substr($line, strlen($regs[0]));
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if ($q == $q_level && $line
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&& isset($text[$last])
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&& $text[$last][strlen($text[$last])-1] == ' '
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) {
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$text[$last] .= $line;
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unset($text[$idx]);
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}
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else {
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$last = $idx;
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}
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}
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else {
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$q = 0;
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if ($line == '-- ') {
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$last = $idx;
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}
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else {
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// remove space-stuffing
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$line = preg_replace('/^\s/', '', $line);
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if (isset($text[$last]) && $line
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&& $text[$last] != '-- '
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&& $text[$last][strlen($text[$last])-1] == ' '
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) {
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$text[$last] .= $line;
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unset($text[$idx]);
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}
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else {
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$text[$idx] = $line;
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$last = $idx;
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}
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}
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}
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$q_level = $q;
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}
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return implode("\r\n", $text);
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}
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/**
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* Wrap the given text to comply with RFC 2646
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*
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* @param string $text Text to wrap
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* @param int $length Length
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*
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* @return string Wrapped text
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*/
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public static function format_flowed($text, $length = 72)
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{
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$text = preg_split('/\r?\n/', $text);
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foreach ($text as $idx => $line) {
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if ($line != '-- ') {
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if ($line[0] == '>' && preg_match('/^(>+)/', $line, $regs)) {
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$prefix = $regs[0];
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$level = strlen($prefix);
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$line = rtrim(substr($line, $level));
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$line = $prefix . rc_wordwrap($line, $length - $level - 2, " \r\n$prefix ");
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}
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else if ($line) {
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$line = rc_wordwrap(rtrim($line), $length - 2, " \r\n");
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// space-stuffing
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$line = preg_replace('/(^|\r\n)(From| |>)/', '\\1 \\2', $line);
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}
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$text[$idx] = $line;
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}
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}
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return implode("\r\n", $text);
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}
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}
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