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-rw-r--r--program/include/rcube_mime.php484
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diff --git a/program/include/rcube_mime.php b/program/include/rcube_mime.php
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+<?php
+
+/**
+ +-----------------------------------------------------------------------+
+ | program/include/rcube_mime.php |
+ | |
+ | This file is part of the Roundcube Webmail client |
+ | Copyright (C) 2005-2012, The Roundcube Dev Team |
+ | Copyright (C) 2011-2012, Kolab Systems AG |
+ | Licensed under the GNU GPL |
+ | |
+ | PURPOSE: |
+ | MIME message parsing utilities |
+ | |
+ +-----------------------------------------------------------------------+
+ | Author: Thomas Bruederli <roundcube@gmail.com> |
+ | Author: Aleksander Machniak <alec@alec.pl> |
+ +-----------------------------------------------------------------------+
+
+ $Id$
+
+*/
+
+
+/**
+ * Class for parsing MIME messages
+ *
+ * @package Mail
+ * @author Thomas Bruederli <roundcube@gmail.com>
+ * @author Aleksander Machniak <alec@alec.pl>
+ */
+class rcube_mime
+{
+ private static $default_charset = RCMAIL_CHARSET;
+
+
+ /**
+ * Object constructor.
+ */
+ function __construct($default_charset = null)
+ {
+ if ($default_charset) {
+ self::$default_charset = $default_charset;
+ }
+ else {
+ self::$default_charset = rcmail::get_instance()->config->get('default_charset', RCMAIL_CHARSET);
+ }
+ }
+
+
+ /**
+ * Split an address list into a structured array list
+ *
+ * @param string $input Input string
+ * @param int $max List only this number of addresses
+ * @param boolean $decode Decode address strings
+ * @param string $fallback Fallback charset if none specified
+ *
+ * @return array Indexed list of addresses
+ */
+ static function decode_address_list($input, $max = null, $decode = true, $fallback = null)
+ {
+ $a = self::parse_address_list($input, $decode, $fallback);
+ $out = array();
+ $j = 0;
+
+ // Special chars as defined by RFC 822 need to in quoted string (or escaped).
+ $special_chars = '[\(\)\<\>\\\.\[\]@,;:"]';
+
+ if (!is_array($a))
+ return $out;
+
+ foreach ($a as $val) {
+ $j++;
+ $address = trim($val['address']);
+ $name = trim($val['name']);
+
+ if ($name && $address && $name != $address)
+ $string = sprintf('%s <%s>', preg_match("/$special_chars/", $name) ? '"'.addcslashes($name, '"').'"' : $name, $address);
+ else if ($address)
+ $string = $address;
+ else if ($name)
+ $string = $name;
+
+ $out[$j] = array(
+ 'name' => $name,
+ 'mailto' => $address,
+ 'string' => $string
+ );
+
+ if ($max && $j==$max)
+ break;
+ }
+
+ return $out;
+ }
+
+
+ /**
+ * Decode a message header value
+ *
+ * @param string $input Header value
+ * @param string $fallback Fallback charset if none specified
+ *
+ * @return string Decoded string
+ */
+ public static function decode_header($input, $fallback = null)
+ {
+ $str = self::decode_mime_string((string)$input, $fallback);
+
+ return $str;
+ }
+
+
+ /**
+ * Decode a mime-encoded string to internal charset
+ *
+ * @param string $input Header value
+ * @param string $fallback Fallback charset if none specified
+ *
+ * @return string Decoded string
+ */
+ public static function decode_mime_string($input, $fallback = null)
+ {
+ $default_charset = !empty($fallback) ? $fallback : self::$default_charset;
+
+ // rfc: all line breaks or other characters not found
+ // in the Base64 Alphabet must be ignored by decoding software
+ // delete all blanks between MIME-lines, differently we can
+ // receive unnecessary blanks and broken utf-8 symbols
+ $input = preg_replace("/\?=\s+=\?/", '?==?', $input);
+
+ // encoded-word regexp
+ $re = '/=\?([^?]+)\?([BbQq])\?([^\n]*?)\?=/';
+
+ // Find all RFC2047's encoded words
+ if (preg_match_all($re, $input, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {
+ // Initialize variables
+ $tmp = array();
+ $out = '';
+ $start = 0;
+
+ foreach ($matches as $idx => $m) {
+ $pos = $m[0][1];
+ $charset = $m[1][0];
+ $encoding = $m[2][0];
+ $text = $m[3][0];
+ $length = strlen($m[0][0]);
+
+ // Append everything that is before the text to be decoded
+ if ($start != $pos) {
+ $substr = substr($input, $start, $pos-$start);
+ $out .= rcube_charset_convert($substr, $default_charset);
+ $start = $pos;
+ }
+ $start += $length;
+
+ // Per RFC2047, each string part "MUST represent an integral number
+ // of characters . A multi-octet character may not be split across
+ // adjacent encoded-words." However, some mailers break this, so we
+ // try to handle characters spanned across parts anyway by iterating
+ // through and aggregating sequential encoded parts with the same
+ // character set and encoding, then perform the decoding on the
+ // aggregation as a whole.
+
+ $tmp[] = $text;
+ if ($next_match = $matches[$idx+1]) {
+ if ($next_match[0][1] == $start
+ && $next_match[1][0] == $charset
+ && $next_match[2][0] == $encoding
+ ) {
+ continue;
+ }
+ }
+
+ $count = count($tmp);
+ $text = '';
+
+ // Decode and join encoded-word's chunks
+ if ($encoding == 'B' || $encoding == 'b') {
+ // base64 must be decoded a segment at a time
+ for ($i=0; $i<$count; $i++)
+ $text .= base64_decode($tmp[$i]);
+ }
+ else { //if ($encoding == 'Q' || $encoding == 'q') {
+ // quoted printable can be combined and processed at once
+ for ($i=0; $i<$count; $i++)
+ $text .= $tmp[$i];
+
+ $text = str_replace('_', ' ', $text);
+ $text = quoted_printable_decode($text);
+ }
+
+ $out .= rcube_charset_convert($text, $charset);
+ $tmp = array();
+ }
+
+ // add the last part of the input string
+ if ($start != strlen($input)) {
+ $out .= rcube_charset_convert(substr($input, $start), $default_charset);
+ }
+
+ // return the results
+ return $out;
+ }
+
+ // no encoding information, use fallback
+ return rcube_charset_convert($input, $default_charset);
+ }
+
+
+ /**
+ * Decode a mime part
+ *
+ * @param string $input Input string
+ * @param string $encoding Part encoding
+ * @return string Decoded string
+ */
+ public static function decode($input, $encoding = '7bit')
+ {
+ switch (strtolower($encoding)) {
+ case 'quoted-printable':
+ return quoted_printable_decode($input);
+ case 'base64':
+ return base64_decode($input);
+ case 'x-uuencode':
+ case 'x-uue':
+ case 'uue':
+ case 'uuencode':
+ return convert_uudecode($input);
+ case '7bit':
+ default:
+ return $input;
+ }
+ }
+
+
+ /**
+ * Split RFC822 header string into an associative array
+ * @access private
+ */
+ public static function parse_headers($headers)
+ {
+ $a_headers = array();
+ $headers = preg_replace('/\r?\n(\t| )+/', ' ', $headers);
+ $lines = explode("\n", $headers);
+ $c = count($lines);
+
+ for ($i=0; $i<$c; $i++) {
+ if ($p = strpos($lines[$i], ': ')) {
+ $field = strtolower(substr($lines[$i], 0, $p));
+ $value = trim(substr($lines[$i], $p+1));
+ if (!empty($value))
+ $a_headers[$field] = $value;
+ }
+ }
+
+ return $a_headers;
+ }
+
+
+ /**
+ * @access private
+ */
+ private static function parse_address_list($str, $decode = true, $fallback = null)
+ {
+ // remove any newlines and carriage returns before
+ $str = preg_replace('/\r?\n(\s|\t)?/', ' ', $str);
+
+ // extract list items, remove comments
+ $str = self::explode_header_string(',;', $str, true);
+ $result = array();
+
+ // simplified regexp, supporting quoted local part
+ $email_rx = '(\S+|("\s*(?:[^"\f\n\r\t\v\b\s]+\s*)+"))@\S+';
+
+ foreach ($str as $key => $val) {
+ $name = '';
+ $address = '';
+ $val = trim($val);
+
+ if (preg_match('/(.*)<('.$email_rx.')>$/', $val, $m)) {
+ $address = $m[2];
+ $name = trim($m[1]);
+ }
+ else if (preg_match('/^('.$email_rx.')$/', $val, $m)) {
+ $address = $m[1];
+ $name = '';
+ }
+ else {
+ $name = $val;
+ }
+
+ // dequote and/or decode name
+ if ($name) {
+ if ($name[0] == '"' && $name[strlen($name)-1] == '"') {
+ $name = substr($name, 1, -1);
+ $name = stripslashes($name);
+ }
+ if ($decode) {
+ $name = self::decode_header($name, $fallback);
+ }
+ }
+
+ if (!$address && $name) {
+ $address = $name;
+ }
+
+ if ($address) {
+ $result[$key] = array('name' => $name, 'address' => $address);
+ }
+ }
+
+ return $result;
+ }
+
+
+ /**
+ * Explodes header (e.g. address-list) string into array of strings
+ * using specified separator characters with proper handling
+ * of quoted-strings and comments (RFC2822)
+ *
+ * @param string $separator String containing separator characters
+ * @param string $str Header string
+ * @param bool $remove_comments Enable to remove comments
+ *
+ * @return array Header items
+ */
+ public static function explode_header_string($separator, $str, $remove_comments = false)
+ {
+ $length = strlen($str);
+ $result = array();
+ $quoted = false;
+ $comment = 0;
+ $out = '';
+
+ for ($i=0; $i<$length; $i++) {
+ // we're inside a quoted string
+ if ($quoted) {
+ if ($str[$i] == '"') {
+ $quoted = false;
+ }
+ else if ($str[$i] == "\\") {
+ if ($comment <= 0) {
+ $out .= "\\";
+ }
+ $i++;
+ }
+ }
+ // we are inside a comment string
+ else if ($comment > 0) {
+ if ($str[$i] == ')') {
+ $comment--;
+ }
+ else if ($str[$i] == '(') {
+ $comment++;
+ }
+ else if ($str[$i] == "\\") {
+ $i++;
+ }
+ continue;
+ }
+ // separator, add to result array
+ else if (strpos($separator, $str[$i]) !== false) {
+ if ($out) {
+ $result[] = $out;
+ }
+ $out = '';
+ continue;
+ }
+ // start of quoted string
+ else if ($str[$i] == '"') {
+ $quoted = true;
+ }
+ // start of comment
+ else if ($remove_comments && $str[$i] == '(') {
+ $comment++;
+ }
+
+ if ($comment <= 0) {
+ $out .= $str[$i];
+ }
+ }
+
+ if ($out && $comment <= 0) {
+ $result[] = $out;
+ }
+
+ return $result;
+ }
+
+
+ /**
+ * Interpret a format=flowed message body according to RFC 2646
+ *
+ * @param string $text Raw body formatted as flowed text
+ *
+ * @return string Interpreted text with unwrapped lines and stuffed space removed
+ */
+ public static function unfold_flowed($text)
+ {
+ $text = preg_split('/\r?\n/', $text);
+ $last = -1;
+ $q_level = 0;
+
+ foreach ($text as $idx => $line) {
+ if ($line[0] == '>' && preg_match('/^(>+\s*)/', $line, $regs)) {
+ $q = strlen(str_replace(' ', '', $regs[0]));
+ $line = substr($line, strlen($regs[0]));
+
+ if ($q == $q_level && $line
+ && isset($text[$last])
+ && $text[$last][strlen($text[$last])-1] == ' '
+ ) {
+ $text[$last] .= $line;
+ unset($text[$idx]);
+ }
+ else {
+ $last = $idx;
+ }
+ }
+ else {
+ $q = 0;
+ if ($line == '-- ') {
+ $last = $idx;
+ }
+ else {
+ // remove space-stuffing
+ $line = preg_replace('/^\s/', '', $line);
+
+ if (isset($text[$last]) && $line
+ && $text[$last] != '-- '
+ && $text[$last][strlen($text[$last])-1] == ' '
+ ) {
+ $text[$last] .= $line;
+ unset($text[$idx]);
+ }
+ else {
+ $text[$idx] = $line;
+ $last = $idx;
+ }
+ }
+ }
+ $q_level = $q;
+ }
+
+ return implode("\r\n", $text);
+ }
+
+
+ /**
+ * Wrap the given text to comply with RFC 2646
+ *
+ * @param string $text Text to wrap
+ * @param int $length Length
+ *
+ * @return string Wrapped text
+ */
+ public static function format_flowed($text, $length = 72)
+ {
+ $text = preg_split('/\r?\n/', $text);
+
+ foreach ($text as $idx => $line) {
+ if ($line != '-- ') {
+ if ($line[0] == '>' && preg_match('/^(>+)/', $line, $regs)) {
+ $prefix = $regs[0];
+ $level = strlen($prefix);
+ $line = rtrim(substr($line, $level));
+ $line = $prefix . rc_wordwrap($line, $length - $level - 2, " \r\n$prefix ");
+ }
+ else if ($line) {
+ $line = rc_wordwrap(rtrim($line), $length - 2, " \r\n");
+ // space-stuffing
+ $line = preg_replace('/(^|\r\n)(From| |>)/', '\\1 \\2', $line);
+ }
+
+ $text[$idx] = $line;
+ }
+ }
+
+ return implode("\r\n", $text);
+ }
+
+}
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