/usr/share/php/Horde/Mime.php is in php-horde-mime 2.2.8-1.
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/**
* The Horde_Mime:: class provides methods for dealing with various MIME (see,
* e.g., RFC 2045-2049; 2183; 2231) standards.
*
* -----
*
* This file contains code adapted from PEAR's Mail_mimeDecode library (v1.5).
*
* http://pear.php.net/package/Mail_mime
*
* This code appears in Horde_Mime::decodeParam().
*
* This code was originally released under this license:
*
* LICENSE: This LICENSE is in the BSD license style.
* Copyright (c) 2002-2003, Richard Heyes <richard@phpguru.org>
* Copyright (c) 2003-2006, PEAR <pear-group@php.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - Neither the name of the authors, nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
* -----
*
* This file contains code adapted from PEAR's PHP_Compat library (v1.6.0a3).
*
* http://pear.php.net/package/PHP_Compat
*
* This code appears in Horde_Mime::_uudecode().
*
* This code was originally released under the LGPL 2.1
*
* -----
*
* Copyright 1999-2013 Horde LLC (http://www.horde.org/)
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @author Chuck Hagenbuch <chuck@horde.org>
* @author Michael Slusarz <slusarz@horde.org>
* @category Horde
* @license http://www.horde.org/licenses/lgpl21 LGPL 2.1
* @package Mime
*/
class Horde_Mime
{
/**
* The RFC defined EOL string.
*
* @var string
*/
const EOL = "\r\n";
/**
* The list of characters required to be quoted in MIME parameters
* (regular expression).
*
* @since 2.1.0
*
* @var string
*/
const MIME_PARAM_QUOTED = '/[\x01-\x20\x22\x28\x29\x2c\x2f\x3a-\x40\x5b-\x5d]/';
/**
* Attempt to work around non RFC 2231-compliant MUAs by generating both
* a RFC 2047-like parameter name and also the correct RFC 2231
* parameter. See:
* http://lists.horde.org/archives/dev/Week-of-Mon-20040426/014240.html
*
* @var boolean
*/
static public $brokenRFC2231 = false;
/**
* Use windows-1252 charset when decoding ISO-8859-1 data?
*
* @var boolean
*/
static public $decodeWindows1252 = false;
/**
* Determines if a string contains 8-bit (non US-ASCII) characters.
*
* @param string $string The string to check.
* @param string $charset The charset of the string. Defaults to
* US-ASCII.
*
* @return boolean True if string contains non US-ASCII characters.
*/
static public function is8bit($string, $charset = null)
{
return ($string != Horde_String::convertCharset($string, $charset, 'US-ASCII'));
}
/**
* MIME encodes a string (RFC 2047).
*
* @param string $text The text to encode (UTF-8).
* @param string $charset The character set to encode to.
*
* @return string The MIME encoded string (US-ASCII).
*/
static public function encode($text, $charset = 'UTF-8')
{
/* The null character is valid US-ASCII, but was removed from the
* allowed e-mail header characters in RFC 2822. */
if (!self::is8bit($text, 'UTF-8') && (strpos($text, null) === false)) {
return $text;
}
$charset = Horde_String::lower($charset);
$text = Horde_String::convertCharset($text, 'UTF-8', $charset);
/* Get the list of elements in the string. */
$size = preg_match_all('/([^\s]+)([\s]*)/', $text, $matches, PREG_SET_ORDER);
$line = '';
/* Return if nothing needs to be encoded. */
foreach ($matches as $key => $val) {
if (self::is8bit($val[1], $charset)) {
if ((($key + 1) < $size) &&
self::is8bit($matches[$key + 1][1], $charset)) {
$line .= self::_encode($val[1] . $val[2], $charset) . ' ';
} else {
$line .= self::_encode($val[1], $charset) . $val[2];
}
} else {
$line .= $val[1] . $val[2];
}
}
return rtrim($line);
}
/**
* Internal helper function to MIME encode a string.
*
* @param string $text The text to encode.
* @param string $charset The character set of the text.
*
* @return string The MIME encoded text.
*/
static protected function _encode($text, $charset)
{
$encoded = trim(base64_encode($text));
$c_size = strlen($charset) + 7;
if ((strlen($encoded) + $c_size) > 75) {
$parts = explode(self::EOL, rtrim(chunk_split($encoded, intval((75 - $c_size) / 4) * 4)));
} else {
$parts[] = $encoded;
}
$p_size = count($parts);
$out = '';
foreach ($parts as $key => $val) {
$out .= '=?' . $charset . '?b?' . $val . '?=';
if ($p_size > $key + 1) {
/* RFC 2047 [2]: no encoded word can be more than 75
* characters long. If longer, you must split the word with
* CRLF SPACE. */
$out .= self::EOL . ' ';
}
}
return $out;
}
/**
* Encodes a line via quoted-printable encoding.
*
* @param string $text The text to encode (UTF-8).
* @param string $eol The EOL sequence to use.
* @param integer $wrap Wrap a line at this many characters.
*
* @return string The quoted-printable encoded string.
*/
static public function quotedPrintableEncode($text, $eol = self::EOL,
$wrap = 76)
{
$curr_length = 0;
$output = '';
/* We need to go character by character through the data. */
for ($i = 0, $length = strlen($text); $i < $length; ++$i) {
$char = $text[$i];
/* If we have reached the end of the line, reset counters. */
if ($char == "\n") {
$output .= $eol;
$curr_length = 0;
continue;
} elseif ($char == "\r") {
continue;
}
/* Spaces or tabs at the end of the line are NOT allowed. Also,
* ASCII characters below 32 or above 126 AND 61 must be
* encoded. */
$ascii = ord($char);
if ((($ascii === 32) &&
($i + 1 != $length) &&
(($text[$i + 1] == "\n") || ($text[$i + 1] == "\r"))) ||
(($ascii < 32) || ($ascii > 126) || ($ascii === 61))) {
$char_len = 3;
$char = '=' . Horde_String::upper(sprintf('%02s', dechex($ascii)));
} else {
$char_len = 1;
}
/* Lines must be $wrap characters or less. */
$curr_length += $char_len;
if ($curr_length > $wrap) {
$output .= '=' . $eol;
$curr_length = $char_len;
}
$output .= $char;
}
return $output;
}
/**
* Decodes a MIME encoded (RFC 2047) string.
*
* @param string $string The MIME encoded text.
*
* @return string The decoded text.
*/
static public function decode($string)
{
/* Take out any spaces between multiple encoded words. */
$string = preg_replace('|\?=\s+=\?|', '?==?', $string);
$out = '';
$old_pos = 0;
while (($pos = strpos($string, '=?', $old_pos)) !== false) {
/* Save any preceding text. */
$out .= substr($string, $old_pos, $pos - $old_pos);
/* Search for first delimiting question mark (charset). */
if (($d1 = strpos($string, '?', $pos + 2)) === false) {
break;
}
$orig_charset = substr($string, $pos + 2, $d1 - $pos - 2);
if (self::$decodeWindows1252 &&
(Horde_String::lower($orig_charset) == 'iso-8859-1')) {
$orig_charset = 'windows-1252';
}
/* Search for second delimiting question mark (encoding). */
if (($d2 = strpos($string, '?', $d1 + 1)) === false) {
break;
}
$encoding = substr($string, $d1 + 1, $d2 - $d1 - 1);
/* Search for end of encoded data. */
if (($end = strpos($string, '?=', $d2 + 1)) === false) {
break;
}
$encoded_text = substr($string, $d2 + 1, $end - $d2 - 1);
switch ($encoding) {
case 'Q':
case 'q':
$out .= Horde_String::convertCharset(
preg_replace_callback(
'/=([0-9a-f]{2})/i',
function($ord) {
return chr(hexdec($ord[1]));
},
str_replace('_', ' ', $encoded_text)),
$orig_charset,
'UTF-8'
);
break;
case 'B':
case 'b':
$out .= Horde_String::convertCharset(
base64_decode($encoded_text),
$orig_charset,
'UTF-8'
);
break;
default:
// Ignore unknown encoding.
break;
}
$old_pos = $end + 2;
}
return $out . substr($string, $old_pos);
}
/**
* Encodes a MIME parameter string pursuant to RFC 2183 & 2231
* (Content-Type and Content-Disposition headers).
*
* @param string $name The parameter name.
* @param string $val The parameter value (UTF-8).
* @param array $opts Additional options:
* - charset: (string) The charset to encode to.
* DEFAULT: UTF-8
* - lang: (string) The language to use when encoding.
* DEFAULT: None specified
*
* @return array The encoded parameter string (US-ASCII).
*/
static public function encodeParam($name, $val, array $opts = array())
{
$curr = 0;
$encode = $wrap = false;
$output = array();
$charset = isset($opts['charset'])
? $opts['charset']
: 'UTF-8';
// 2 = '=', ';'
$pre_len = strlen($name) + 2;
/* Several possibilities:
* - String is ASCII. Output as ASCII (duh).
* - Language information has been provided. We MUST encode output
* to include this information.
* - String is non-ASCII, but can losslessly translate to ASCII.
* Output as ASCII (most efficient).
* - String is in non-ASCII, but doesn't losslessly translate to
* ASCII. MUST encode output (duh). */
if (empty($opts['lang']) && !self::is8bit($val, 'UTF-8')) {
$string = $val;
} else {
$cval = Horde_String::convertCharset($val, 'UTF-8', $charset);
$string = Horde_String::lower($charset) . '\'' . (empty($opts['lang']) ? '' : Horde_String::lower($opts['lang'])) . '\'' . rawurlencode($cval);
$encode = true;
/* Account for trailing '*'. */
++$pre_len;
}
if (($pre_len + strlen($string)) > 75) {
/* Account for continuation '*'. */
++$pre_len;
$wrap = true;
while ($string) {
$chunk = 75 - $pre_len - strlen($curr);
$pos = min($chunk, strlen($string) - 1);
/* Don't split in the middle of an encoded char. */
if (($chunk == $pos) && ($pos > 2)) {
for ($i = 0; $i <= 2; ++$i) {
if ($string[$pos - $i] == '%') {
$pos -= $i + 1;
break;
}
}
}
$lines[] = substr($string, 0, $pos + 1);
$string = substr($string, $pos + 1);
++$curr;
}
} else {
$lines = array($string);
}
foreach ($lines as $i => $line) {
$output[$name . (($wrap) ? ('*' . $i) : '') . (($encode) ? '*' : '')] = $line;
}
if (self::$brokenRFC2231 && !isset($output[$name])) {
$output = array_merge(array(
$name => self::encode($val, $charset)
), $output);
}
/* Escape certain characters in params (See RFC 2045 [Appendix A]).
* Must be quoted-string if one of these exists.
* Forbidden: SPACE, CTLs, ()<>@,;:\"/[]?= */
foreach ($output as $k => $v) {
if (preg_match(self::MIME_PARAM_QUOTED, $v)) {
$output[$k] = '"' . addcslashes($v, '\\"') . '"';
}
}
return $output;
}
/**
* Decodes a MIME parameter string pursuant to RFC 2183 & 2231
* (Content-Type and Content-Disposition headers).
*
* @param string $type Either 'Content-Type' or 'Content-Disposition'
* (case-insensitive).
* @param mixed $data The text of the header or an array of param name
* => param values.
*
* @return array An array with the following entries (all strings in
* UTF-8):
* - params: (array) The header's parameter values.
* - val: (string) The header's "base" value.
*/
static public function decodeParam($type, $data)
{
$convert = array();
$ret = array('params' => array(), 'val' => '');
$splitRegex = '/([^;\'"]*[\'"]([^\'"]*([^\'"]*)*)[\'"][^;\'"]*|([^;]+))(;|$)/';
$type = Horde_String::lower($type);
if (is_array($data)) {
// Use dummy base values
$ret['val'] = ($type == 'content-type')
? 'text/plain'
: 'attachment';
$params = $data;
} else {
/* This code was adapted from PEAR's Mail_mimeDecode::. */
if (($pos = strpos($data, ';')) === false) {
$ret['val'] = trim($data);
return $ret;
}
$ret['val'] = trim(substr($data, 0, $pos));
$data = trim(substr($data, ++$pos));
$params = $tmp = array();
if (strlen($data) > 0) {
/* This splits on a semi-colon, if there's no preceeding
* backslash. */
preg_match_all($splitRegex, $data, $matches);
for ($i = 0, $cnt = count($matches[0]); $i < $cnt; ++$i) {
$param = $matches[0][$i];
while (substr($param, -2) == '\;') {
$param .= $matches[0][++$i];
}
$tmp[] = $param;
}
for ($i = 0, $cnt = count($tmp); $i < $cnt; ++$i) {
$pos = strpos($tmp[$i], '=');
$p_name = trim(substr($tmp[$i], 0, $pos), "'\";\t\\ ");
$p_val = trim(str_replace('\;', ';', substr($tmp[$i], $pos + 1)), "'\";\t\\ ");
if (strlen($p_val) && ($p_val[0] == '"')) {
$p_val = substr($p_val, 1, -1);
}
$params[$p_name] = $p_val;
}
}
/* End of code adapted from PEAR's Mail_mimeDecode::. */
}
/* Sort the params list. Prevents us from having to manually keep
* track of continuation values below. */
uksort($params, 'strnatcasecmp');
foreach ($params as $name => $val) {
/* Asterisk at end indicates encoded value. */
if (substr($name, -1) == '*') {
$name = substr($name, 0, -1);
$encode = true;
} else {
$encode = false;
}
/* This asterisk indicates continuation parameter. */
if (($pos = strrpos($name, '*')) !== false) {
$name = substr($name, 0, $pos);
}
if (!isset($ret['params'][$name]) ||
($encode && !isset($convert[$name]))) {
$ret['params'][$name] = '';
}
$ret['params'][$name] .= $val;
if ($encode) {
$convert[$name] = true;
}
}
foreach (array_keys($convert) as $name) {
$val = $ret['params'][$name];
$quote = strpos($val, "'");
$orig_charset = substr($val, 0, $quote);
if (self::$decodeWindows1252 &&
(Horde_String::lower($orig_charset) == 'iso-8859-1')) {
$orig_charset = 'windows-1252';
}
/* Ignore language. */
$quote = strpos($val, "'", $quote + 1);
substr($val, $quote + 1);
$ret['params'][$name] = Horde_String::convertCharset(urldecode(substr($val, $quote + 1)), $orig_charset, 'UTF-8');
}
/* MIME parameters are supposed to be encoded via RFC 2231, but many
* mailers do RFC 2045 encoding instead. However, if we see at least
* one RFC 2231 encoding, then assume the sending mailer knew what
* it was doing. */
if (empty($convert)) {
foreach (array_diff(array_keys($ret['params']), array_keys($convert)) as $name) {
$ret['params'][$name] = self::decode($ret['params'][$name]);
}
}
return $ret;
}
/**
* Generates a Message-ID string conforming to RFC 2822 [3.6.4] and the
* standards outlined in 'draft-ietf-usefor-message-id-01.txt'.
*
* @param string A message ID string.
*/
static public function generateMessageId()
{
return '<' . strval(new Horde_Support_Guid(array('prefix' => 'Horde'))) . '>';
}
/**
* Performs MIME ID "arithmetic" on a given ID.
*
* @param string $id The MIME ID string.
* @param string $action One of the following:
* - down: ID of child. Note: down will first traverse to "$id.0" if
* given an ID *NOT* of the form "$id.0". If given an ID of the
* form "$id.0", down will traverse to "$id.1". This behavior
* can be avoided if 'norfc822' option is set.
* - next: ID of next sibling.
* - prev: ID of previous sibling.
* - up: ID of parent. Note: up will first traverse to "$id.0" if
* given an ID *NOT* of the form "$id.0". If given an ID of the
* form "$id.0", down will traverse to "$id". This behavior can be
* avoided if 'norfc822' option is set.
* @param array $options Additional options:
* - count: (integer) How many levels to traverse.
* DEFAULT: 1
* - norfc822: (boolean) Don't traverse rfc822 sub-levels
* DEFAULT: false
*
* @return mixed The resulting ID string, or null if that ID can not
* exist.
*/
static public function mimeIdArithmetic($id, $action, $options = array())
{
$pos = strrpos($id, '.');
$end = ($pos === false) ? $id : substr($id, $pos + 1);
switch ($action) {
case 'down':
if ($end == '0') {
$id = ($pos === false) ? 1 : substr_replace($id, '1', $pos + 1);
} else {
$id .= empty($options['norfc822']) ? '.0' : '.1';
}
break;
case 'next':
++$end;
$id = ($pos === false) ? $end : substr_replace($id, $end, $pos + 1);
break;
case 'prev':
if (($end == '0') ||
(empty($options['norfc822']) && ($end == '1'))) {
$id = null;
} elseif ($pos === false) {
$id = --$end;
} else {
$id = substr_replace($id, --$end, $pos + 1);
}
break;
case 'up':
if ($pos === false) {
$id = ($end == '0') ? null : '0';
} elseif (!empty($options['norfc822']) || ($end == '0')) {
$id = substr($id, 0, $pos);
} else {
$id = substr_replace($id, '0', $pos + 1);
}
break;
}
return (!is_null($id) && !empty($options['count']) && --$options['count'])
? self::mimeIdArithmetic($id, $action, $options)
: $id;
}
/**
* Determines if a given MIME ID lives underneath a base ID.
*
* @param string $base The base MIME ID.
* @param string $id The MIME ID to query.
*
* @return boolean Whether $id lives underneath $base.
*/
static public function isChild($base, $id)
{
$base = (substr($base, -2) == '.0')
? substr($base, 0, -1)
: rtrim($base, '.') . '.';
return ((($base == 0) && ($id != 0)) ||
(strpos(strval($id), strval($base)) === 0));
}
/**
* Scans $input for uuencoded data and converts it to unencoded data.
*
* @param string $input The input data
*
* @return array A list of arrays, with each array corresponding to
* a file in the input and containing the following keys:
* - data: (string) Unencoded data.
* - name: (string) Filename.
* - perms: (string) Octal permissions.
*/
static public function uudecode($input)
{
$data = array();
/* Find all uuencoded sections. */
if (preg_match_all("/begin ([0-7]{3}) (.+)\r?\n(.+)\r?\nend/Us", $input, $matches, PREG_SET_ORDER)) {
reset($matches);
while (list(,$v) = each($matches)) {
$data[] = array(
'data' => self::_uudecode($v[3]),
'name' => $v[2],
'perm' => $v[1]
);
}
}
return $data;
}
/**
* PHP 5's built-in convert_uudecode() is broken. Need this wrapper.
*
* @param string $input UUencoded input.
*
* @return string Decoded string.
*/
static protected function _uudecode($input)
{
$decoded = '';
foreach (explode("\n", $input) as $line) {
$c = count($bytes = unpack('c*', substr(trim($line,"\r\n\t"), 1)));
while ($c % 4) {
$bytes[++$c] = 0;
}
foreach (array_chunk($bytes, 4) as $b) {
$b0 = ($b[0] == 0x60) ? 0 : $b[0] - 0x20;
$b1 = ($b[1] == 0x60) ? 0 : $b[1] - 0x20;
$b2 = ($b[2] == 0x60) ? 0 : $b[2] - 0x20;
$b3 = ($b[3] == 0x60) ? 0 : $b[3] - 0x20;
$b0 <<= 2;
$b0 |= ($b1 >> 4) & 0x03;
$b1 <<= 4;
$b1 |= ($b2 >> 2) & 0x0F;
$b2 <<= 6;
$b2 |= $b3 & 0x3F;
$decoded .= pack('c*', $b0, $b1, $b2);
}
}
return rtrim($decoded, "\0");
}
}
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