| 1 | <?php |
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| 2 | |
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| 3 | /* |
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| 4 | +-----------------------------------------------------------------------+ |
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| 5 | | program/include/rcube_mime.php | |
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| 6 | | | |
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| 7 | | This file is part of the Roundcube Webmail client | |
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| 8 | | Copyright (C) 2005-2012, The Roundcube Dev Team | |
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| 9 | | Copyright (C) 2011-2012, Kolab Systems AG | |
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| 10 | | | |
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| 11 | | Licensed under the GNU General Public License version 3 or | |
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| 12 | | any later version with exceptions for skins & plugins. | |
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| 13 | | See the README file for a full license statement. | |
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| 14 | | | |
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| 15 | | PURPOSE: | |
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| 16 | | MIME message parsing utilities | |
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| 17 | | | |
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| 18 | +-----------------------------------------------------------------------+ |
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| 19 | | Author: Thomas Bruederli <roundcube@gmail.com> | |
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| 20 | | Author: Aleksander Machniak <alec@alec.pl> | |
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| 21 | +-----------------------------------------------------------------------+ |
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| 22 | |
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| 23 | $Id$ |
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| 24 | |
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| 25 | */ |
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| 26 | |
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| 27 | |
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| 28 | /** |
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| 29 | * Class for parsing MIME messages |
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| 30 | * |
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| 31 | * @package Mail |
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| 32 | * @author Thomas Bruederli <roundcube@gmail.com> |
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| 33 | * @author Aleksander Machniak <alec@alec.pl> |
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| 34 | */ |
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| 35 | class rcube_mime |
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| 36 | { |
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| 37 | private static $default_charset = RCMAIL_CHARSET; |
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| 38 | |
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| 39 | |
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| 40 | /** |
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| 41 | * Object constructor. |
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| 42 | */ |
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| 43 | function __construct($default_charset = null) |
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| 44 | { |
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| 45 | if ($default_charset) { |
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| 46 | self::$default_charset = $default_charset; |
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| 47 | } |
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| 48 | else { |
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| 49 | self::$default_charset = rcmail::get_instance()->config->get('default_charset', RCMAIL_CHARSET); |
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| 50 | } |
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| 51 | } |
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| 52 | |
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| 53 | |
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| 54 | /** |
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| 55 | * Parse the given raw message source and return a structure |
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| 56 | * of rcube_message_part objects. |
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| 57 | * |
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| 58 | * It makes use of the PEAR:Mail_mimeDecode library |
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| 59 | * |
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| 60 | * @param string The message source |
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| 61 | * @return object rcube_message_part The message structure |
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| 62 | */ |
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| 63 | public static function parse_message($raw_body) |
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| 64 | { |
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| 65 | $mime = new Mail_mimeDecode($raw_body); |
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| 66 | $struct = $mime->decode(array('include_bodies' => true, 'decode_bodies' => true)); |
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| 67 | return self::structure_part($struct); |
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| 68 | } |
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| 69 | |
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| 70 | |
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| 71 | /** |
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| 72 | * Recursive method to convert a Mail_mimeDecode part into a rcube_message_part object |
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| 73 | * |
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| 74 | * @param object A message part struct |
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| 75 | * @param int Part count |
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| 76 | * @param string Parent MIME ID |
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| 77 | * |
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| 78 | * @return object rcube_message_part |
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| 79 | */ |
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| 80 | private static function structure_part($part, $count=0, $parent='') |
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| 81 | { |
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| 82 | $struct = new rcube_message_part; |
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| 83 | $struct->mime_id = $part->mime_id ? $part->mime_id : (empty($parent) ? (string)$count : "$parent.$count"); |
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| 84 | $struct->headers = $part->headers; |
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| 85 | $struct->ctype_primary = $part->ctype_primary; |
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| 86 | $struct->ctype_secondary = $part->ctype_secondary; |
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| 87 | $struct->mimetype = $part->ctype_primary . '/' . $part->ctype_secondary; |
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| 88 | $struct->ctype_parameters = $part->ctype_parameters; |
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| 89 | |
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| 90 | if ($part->headers['content-transfer-encoding']) |
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| 91 | $struct->encoding = $part->headers['content-transfer-encoding']; |
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| 92 | if ($part->ctype_parameters['charset']) |
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| 93 | $struct->charset = $part->ctype_parameters['charset']; |
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| 94 | |
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| 95 | $part_charset = $struct->charset ? $struct->charset : self::$default_charset; |
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| 96 | |
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| 97 | // determine filename |
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| 98 | if (($filename = $part->d_parameters['filename']) || ($filename = $part->ctype_parameters['name'])) { |
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| 99 | $struct->filename = rcube_mime::decode_mime_string($filename, $part_charset); |
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| 100 | } |
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| 101 | |
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| 102 | // copy part body and convert it to UTF-8 if necessary |
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| 103 | $struct->body = $part->ctype_primary == 'text' || !$part->ctype_parameters['charset'] ? rcube_charset::convert($part->body, $part_charset) : $part->body; |
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| 104 | $struct->size = strlen($part->body); |
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| 105 | $struct->disposition = $part->disposition; |
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| 106 | |
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| 107 | foreach ((array)$part->parts as $child_part) { |
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| 108 | $struct->parts[] = self::structure_part($child_part, ++$count, $struct->mime_id); |
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| 109 | } |
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| 110 | |
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| 111 | return $struct; |
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| 112 | } |
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| 113 | |
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| 114 | |
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| 115 | /** |
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| 116 | * Split an address list into a structured array list |
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| 117 | * |
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| 118 | * @param string $input Input string |
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| 119 | * @param int $max List only this number of addresses |
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| 120 | * @param boolean $decode Decode address strings |
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| 121 | * @param string $fallback Fallback charset if none specified |
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| 122 | * |
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| 123 | * @return array Indexed list of addresses |
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| 124 | */ |
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| 125 | static function decode_address_list($input, $max = null, $decode = true, $fallback = null) |
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| 126 | { |
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| 127 | $a = self::parse_address_list($input, $decode, $fallback); |
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| 128 | $out = array(); |
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| 129 | $j = 0; |
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| 130 | |
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| 131 | // Special chars as defined by RFC 822 need to in quoted string (or escaped). |
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| 132 | $special_chars = '[\(\)\<\>\\\.\[\]@,;:"]'; |
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| 133 | |
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| 134 | if (!is_array($a)) |
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| 135 | return $out; |
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| 136 | |
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| 137 | foreach ($a as $val) { |
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| 138 | $j++; |
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| 139 | $address = trim($val['address']); |
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| 140 | $name = trim($val['name']); |
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| 141 | |
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| 142 | if ($name && $address && $name != $address) |
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| 143 | $string = sprintf('%s <%s>', preg_match("/$special_chars/", $name) ? '"'.addcslashes($name, '"').'"' : $name, $address); |
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| 144 | else if ($address) |
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| 145 | $string = $address; |
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| 146 | else if ($name) |
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| 147 | $string = $name; |
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| 148 | |
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| 149 | $out[$j] = array( |
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| 150 | 'name' => $name, |
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| 151 | 'mailto' => $address, |
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| 152 | 'string' => $string |
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| 153 | ); |
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| 154 | |
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| 155 | if ($max && $j==$max) |
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| 156 | break; |
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| 157 | } |
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| 158 | |
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| 159 | return $out; |
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| 160 | } |
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| 161 | |
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| 162 | |
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| 163 | /** |
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| 164 | * Decode a message header value |
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| 165 | * |
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| 166 | * @param string $input Header value |
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| 167 | * @param string $fallback Fallback charset if none specified |
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| 168 | * |
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| 169 | * @return string Decoded string |
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| 170 | */ |
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| 171 | public static function decode_header($input, $fallback = null) |
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| 172 | { |
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| 173 | $str = self::decode_mime_string((string)$input, $fallback); |
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| 174 | |
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| 175 | return $str; |
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| 176 | } |
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| 177 | |
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| 178 | |
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| 179 | /** |
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| 180 | * Decode a mime-encoded string to internal charset |
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| 181 | * |
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| 182 | * @param string $input Header value |
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| 183 | * @param string $fallback Fallback charset if none specified |
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| 184 | * |
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| 185 | * @return string Decoded string |
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| 186 | */ |
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| 187 | public static function decode_mime_string($input, $fallback = null) |
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| 188 | { |
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| 189 | $default_charset = !empty($fallback) ? $fallback : self::$default_charset; |
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| 190 | |
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| 191 | // rfc: all line breaks or other characters not found |
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| 192 | // in the Base64 Alphabet must be ignored by decoding software |
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| 193 | // delete all blanks between MIME-lines, differently we can |
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| 194 | // receive unnecessary blanks and broken utf-8 symbols |
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| 195 | $input = preg_replace("/\?=\s+=\?/", '?==?', $input); |
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| 196 | |
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| 197 | // encoded-word regexp |
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| 198 | $re = '/=\?([^?]+)\?([BbQq])\?([^\n]*?)\?=/'; |
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| 199 | |
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| 200 | // Find all RFC2047's encoded words |
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| 201 | if (preg_match_all($re, $input, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) { |
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| 202 | // Initialize variables |
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| 203 | $tmp = array(); |
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| 204 | $out = ''; |
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| 205 | $start = 0; |
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| 206 | |
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| 207 | foreach ($matches as $idx => $m) { |
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| 208 | $pos = $m[0][1]; |
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| 209 | $charset = $m[1][0]; |
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| 210 | $encoding = $m[2][0]; |
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| 211 | $text = $m[3][0]; |
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| 212 | $length = strlen($m[0][0]); |
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| 213 | |
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| 214 | // Append everything that is before the text to be decoded |
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| 215 | if ($start != $pos) { |
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| 216 | $substr = substr($input, $start, $pos-$start); |
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| 217 | $out .= rcube_charset_convert($substr, $default_charset); |
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| 218 | $start = $pos; |
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| 219 | } |
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| 220 | $start += $length; |
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| 221 | |
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| 222 | // Per RFC2047, each string part "MUST represent an integral number |
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| 223 | // of characters . A multi-octet character may not be split across |
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| 224 | // adjacent encoded-words." However, some mailers break this, so we |
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| 225 | // try to handle characters spanned across parts anyway by iterating |
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| 226 | // through and aggregating sequential encoded parts with the same |
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| 227 | // character set and encoding, then perform the decoding on the |
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| 228 | // aggregation as a whole. |
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| 229 | |
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| 230 | $tmp[] = $text; |
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| 231 | if ($next_match = $matches[$idx+1]) { |
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| 232 | if ($next_match[0][1] == $start |
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| 233 | && $next_match[1][0] == $charset |
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| 234 | && $next_match[2][0] == $encoding |
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| 235 | ) { |
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| 236 | continue; |
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| 237 | } |
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| 238 | } |
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| 239 | |
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| 240 | $count = count($tmp); |
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| 241 | $text = ''; |
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| 242 | |
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| 243 | // Decode and join encoded-word's chunks |
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| 244 | if ($encoding == 'B' || $encoding == 'b') { |
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| 245 | // base64 must be decoded a segment at a time |
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| 246 | for ($i=0; $i<$count; $i++) |
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| 247 | $text .= base64_decode($tmp[$i]); |
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| 248 | } |
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| 249 | else { //if ($encoding == 'Q' || $encoding == 'q') { |
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| 250 | // quoted printable can be combined and processed at once |
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| 251 | for ($i=0; $i<$count; $i++) |
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| 252 | $text .= $tmp[$i]; |
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| 253 | |
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| 254 | $text = str_replace('_', ' ', $text); |
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| 255 | $text = quoted_printable_decode($text); |
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| 256 | } |
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| 257 | |
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| 258 | $out .= rcube_charset_convert($text, $charset); |
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| 259 | $tmp = array(); |
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| 260 | } |
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| 261 | |
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| 262 | // add the last part of the input string |
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| 263 | if ($start != strlen($input)) { |
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| 264 | $out .= rcube_charset_convert(substr($input, $start), $default_charset); |
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| 265 | } |
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| 266 | |
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| 267 | // return the results |
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| 268 | return $out; |
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| 269 | } |
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| 270 | |
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| 271 | // no encoding information, use fallback |
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| 272 | return rcube_charset_convert($input, $default_charset); |
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| 273 | } |
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| 274 | |
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| 275 | |
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| 276 | /** |
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| 277 | * Decode a mime part |
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| 278 | * |
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| 279 | * @param string $input Input string |
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| 280 | * @param string $encoding Part encoding |
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| 281 | * @return string Decoded string |
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| 282 | */ |
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| 283 | public static function decode($input, $encoding = '7bit') |
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| 284 | { |
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| 285 | switch (strtolower($encoding)) { |
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| 286 | case 'quoted-printable': |
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| 287 | return quoted_printable_decode($input); |
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| 288 | case 'base64': |
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| 289 | return base64_decode($input); |
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| 290 | case 'x-uuencode': |
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| 291 | case 'x-uue': |
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| 292 | case 'uue': |
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| 293 | case 'uuencode': |
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| 294 | return convert_uudecode($input); |
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| 295 | case '7bit': |
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| 296 | default: |
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| 297 | return $input; |
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| 298 | } |
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| 299 | } |
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| 300 | |
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| 301 | |
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| 302 | /** |
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| 303 | * Split RFC822 header string into an associative array |
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| 304 | * @access private |
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| 305 | */ |
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| 306 | public static function parse_headers($headers) |
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| 307 | { |
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| 308 | $a_headers = array(); |
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| 309 | $headers = preg_replace('/\r?\n(\t| )+/', ' ', $headers); |
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| 310 | $lines = explode("\n", $headers); |
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| 311 | $c = count($lines); |
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| 312 | |
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| 313 | for ($i=0; $i<$c; $i++) { |
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| 314 | if ($p = strpos($lines[$i], ': ')) { |
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| 315 | $field = strtolower(substr($lines[$i], 0, $p)); |
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| 316 | $value = trim(substr($lines[$i], $p+1)); |
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| 317 | if (!empty($value)) |
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| 318 | $a_headers[$field] = $value; |
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| 319 | } |
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| 320 | } |
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| 321 | |
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| 322 | return $a_headers; |
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| 323 | } |
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| 324 | |
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| 325 | |
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| 326 | /** |
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| 327 | * @access private |
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| 328 | */ |
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| 329 | private static function parse_address_list($str, $decode = true, $fallback = null) |
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| 330 | { |
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| 331 | // remove any newlines and carriage returns before |
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| 332 | $str = preg_replace('/\r?\n(\s|\t)?/', ' ', $str); |
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| 333 | |
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| 334 | // extract list items, remove comments |
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| 335 | $str = self::explode_header_string(',;', $str, true); |
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| 336 | $result = array(); |
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| 337 | |
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| 338 | // simplified regexp, supporting quoted local part |
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| 339 | $email_rx = '(\S+|("\s*(?:[^"\f\n\r\t\v\b\s]+\s*)+"))@\S+'; |
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| 340 | |
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| 341 | foreach ($str as $key => $val) { |
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| 342 | $name = ''; |
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| 343 | $address = ''; |
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| 344 | $val = trim($val); |
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| 345 | |
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| 346 | if (preg_match('/(.*)<('.$email_rx.')>$/', $val, $m)) { |
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| 347 | $address = $m[2]; |
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| 348 | $name = trim($m[1]); |
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| 349 | } |
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| 350 | else if (preg_match('/^('.$email_rx.')$/', $val, $m)) { |
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| 351 | $address = $m[1]; |
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| 352 | $name = ''; |
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| 353 | } |
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| 354 | else { |
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| 355 | $name = $val; |
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| 356 | } |
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| 357 | |
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| 358 | // dequote and/or decode name |
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| 359 | if ($name) { |
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| 360 | if ($name[0] == '"' && $name[strlen($name)-1] == '"') { |
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| 361 | $name = substr($name, 1, -1); |
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| 362 | $name = stripslashes($name); |
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| 363 | } |
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| 364 | if ($decode) { |
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| 365 | $name = self::decode_header($name, $fallback); |
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| 366 | } |
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| 367 | } |
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| 368 | |
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| 369 | if (!$address && $name) { |
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| 370 | $address = $name; |
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| 371 | } |
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| 372 | |
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| 373 | if ($address) { |
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| 374 | $result[$key] = array('name' => $name, 'address' => $address); |
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| 375 | } |
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| 376 | } |
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| 377 | |
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| 378 | return $result; |
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| 379 | } |
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| 380 | |
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| 381 | |
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| 382 | /** |
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| 383 | * Explodes header (e.g. address-list) string into array of strings |
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| 384 | * using specified separator characters with proper handling |
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| 385 | * of quoted-strings and comments (RFC2822) |
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| 386 | * |
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| 387 | * @param string $separator String containing separator characters |
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| 388 | * @param string $str Header string |
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| 389 | * @param bool $remove_comments Enable to remove comments |
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| 390 | * |
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| 391 | * @return array Header items |
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| 392 | */ |
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| 393 | public static function explode_header_string($separator, $str, $remove_comments = false) |
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| 394 | { |
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| 395 | $length = strlen($str); |
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| 396 | $result = array(); |
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| 397 | $quoted = false; |
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| 398 | $comment = 0; |
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| 399 | $out = ''; |
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| 400 | |
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| 401 | for ($i=0; $i<$length; $i++) { |
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| 402 | // we're inside a quoted string |
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| 403 | if ($quoted) { |
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| 404 | if ($str[$i] == '"') { |
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| 405 | $quoted = false; |
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| 406 | } |
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| 407 | else if ($str[$i] == "\\") { |
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| 408 | if ($comment <= 0) { |
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| 409 | $out .= "\\"; |
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| 410 | } |
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| 411 | $i++; |
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| 412 | } |
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| 413 | } |
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| 414 | // we are inside a comment string |
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| 415 | else if ($comment > 0) { |
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| 416 | if ($str[$i] == ')') { |
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| 417 | $comment--; |
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| 418 | } |
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| 419 | else if ($str[$i] == '(') { |
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| 420 | $comment++; |
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| 421 | } |
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| 422 | else if ($str[$i] == "\\") { |
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| 423 | $i++; |
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| 424 | } |
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| 425 | continue; |
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| 426 | } |
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| 427 | // separator, add to result array |
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| 428 | else if (strpos($separator, $str[$i]) !== false) { |
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| 429 | if ($out) { |
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| 430 | $result[] = $out; |
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| 431 | } |
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| 432 | $out = ''; |
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| 433 | continue; |
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| 434 | } |
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| 435 | // start of quoted string |
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| 436 | else if ($str[$i] == '"') { |
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| 437 | $quoted = true; |
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| 438 | } |
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| 439 | // start of comment |
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| 440 | else if ($remove_comments && $str[$i] == '(') { |
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| 441 | $comment++; |
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| 442 | } |
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| 443 | |
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| 444 | if ($comment <= 0) { |
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| 445 | $out .= $str[$i]; |
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| 446 | } |
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| 447 | } |
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| 448 | |
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| 449 | if ($out && $comment <= 0) { |
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| 450 | $result[] = $out; |
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| 451 | } |
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| 452 | |
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| 453 | return $result; |
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| 454 | } |
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| 455 | |
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| 456 | |
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| 457 | /** |
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| 458 | * Interpret a format=flowed message body according to RFC 2646 |
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| 459 | * |
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| 460 | * @param string $text Raw body formatted as flowed text |
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| 461 | * |
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| 462 | * @return string Interpreted text with unwrapped lines and stuffed space removed |
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| 463 | */ |
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| 464 | public static function unfold_flowed($text) |
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| 465 | { |
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| 466 | $text = preg_split('/\r?\n/', $text); |
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| 467 | $last = -1; |
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| 468 | $q_level = 0; |
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| 469 | |
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| 470 | foreach ($text as $idx => $line) { |
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| 471 | if ($line[0] == '>' && preg_match('/^(>+\s*)/', $line, $regs)) { |
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| 472 | $q = strlen(str_replace(' ', '', $regs[0])); |
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| 473 | $line = substr($line, strlen($regs[0])); |
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| 474 | |
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| 475 | if ($q == $q_level && $line |
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| 476 | && isset($text[$last]) |
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| 477 | && $text[$last][strlen($text[$last])-1] == ' ' |
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| 478 | ) { |
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| 479 | $text[$last] .= $line; |
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| 480 | unset($text[$idx]); |
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| 481 | } |
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| 482 | else { |
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| 483 | $last = $idx; |
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| 484 | } |
|---|
| 485 | } |
|---|
| 486 | else { |
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| 487 | $q = 0; |
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| 488 | if ($line == '-- ') { |
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| 489 | $last = $idx; |
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| 490 | } |
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| 491 | else { |
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| 492 | // remove space-stuffing |
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| 493 | $line = preg_replace('/^\s/', '', $line); |
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| 494 | |
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| 495 | if (isset($text[$last]) && $line |
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| 496 | && $text[$last] != '-- ' |
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| 497 | && $text[$last][strlen($text[$last])-1] == ' ' |
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| 498 | ) { |
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| 499 | $text[$last] .= $line; |
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| 500 | unset($text[$idx]); |
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| 501 | } |
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| 502 | else { |
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| 503 | $text[$idx] = $line; |
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| 504 | $last = $idx; |
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| 505 | } |
|---|
| 506 | } |
|---|
| 507 | } |
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| 508 | $q_level = $q; |
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| 509 | } |
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| 510 | |
|---|
| 511 | return implode("\r\n", $text); |
|---|
| 512 | } |
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| 513 | |
|---|
| 514 | |
|---|
| 515 | /** |
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| 516 | * Wrap the given text to comply with RFC 2646 |
|---|
| 517 | * |
|---|
| 518 | * @param string $text Text to wrap |
|---|
| 519 | * @param int $length Length |
|---|
| 520 | * |
|---|
| 521 | * @return string Wrapped text |
|---|
| 522 | */ |
|---|
| 523 | public static function format_flowed($text, $length = 72) |
|---|
| 524 | { |
|---|
| 525 | $text = preg_split('/\r?\n/', $text); |
|---|
| 526 | |
|---|
| 527 | foreach ($text as $idx => $line) { |
|---|
| 528 | if ($line != '-- ') { |
|---|
| 529 | if ($line[0] == '>' && preg_match('/^(>+)/', $line, $regs)) { |
|---|
| 530 | $prefix = $regs[0]; |
|---|
| 531 | $level = strlen($prefix); |
|---|
| 532 | $line = rtrim(substr($line, $level)); |
|---|
| 533 | $line = $prefix . rc_wordwrap($line, $length - $level - 2, " \r\n$prefix "); |
|---|
| 534 | } |
|---|
| 535 | else if ($line) { |
|---|
| 536 | $line = rc_wordwrap(rtrim($line), $length - 2, " \r\n"); |
|---|
| 537 | // space-stuffing |
|---|
| 538 | $line = preg_replace('/(^|\r\n)(From| |>)/', '\\1 \\2', $line); |
|---|
| 539 | } |
|---|
| 540 | |
|---|
| 541 | $text[$idx] = $line; |
|---|
| 542 | } |
|---|
| 543 | } |
|---|
| 544 | |
|---|
| 545 | return implode("\r\n", $text); |
|---|
| 546 | } |
|---|
| 547 | |
|---|
| 548 | } |
|---|
