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rcube_mime.php
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rcube_mime.php
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<?php
/**
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| |
| Copyright (C) The Roundcube Dev Team |
| Copyright (C) Kolab Systems AG |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| MIME message parsing utilities |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
| Author: Aleksander Machniak <alec@alec.pl> |
+-----------------------------------------------------------------------+
*/
/**
* Class for parsing MIME messages
*
* @package Framework
* @subpackage Storage
*/
class rcube_mime
{
private static $default_charset;
/**
* Object constructor.
*/
function __construct($default_charset = null)
{
self::$default_charset = $default_charset;
}
/**
* Returns message/object character set name
*
* @return string Character set name
*/
public static function get_charset()
{
if (self::$default_charset) {
return self::$default_charset;
}
if ($charset = rcube::get_instance()->config->get('default_charset')) {
return $charset;
}
return RCUBE_CHARSET;
}
/**
* Parse the given raw message source and return a structure
* of rcube_message_part objects.
*
* It makes use of the rcube_mime_decode library
*
* @param string $raw_body The message source
*
* @return object rcube_message_part The message structure
*/
public static function parse_message($raw_body)
{
$conf = [
'include_bodies' => true,
'decode_bodies' => true,
'decode_headers' => false,
'default_charset' => self::get_charset(),
];
$mime = new rcube_mime_decode($conf);
return $mime->decode($raw_body);
}
/**
* Split an address list into a structured array list
*
* @param string|array $input Input string (or list of strings)
* @param int $max List only this number of addresses
* @param bool $decode Decode address strings
* @param string $fallback Fallback charset if none specified
* @param bool $addronly Return flat array with e-mail addresses only
*
* @return array Indexed list of addresses
*/
static function decode_address_list($input, $max = null, $decode = true, $fallback = null, $addronly = false)
{
// A common case when the same header is used many times in a mail message
if (is_array($input)) {
$input = implode(', ', $input);
}
$a = self::parse_address_list((string) $input, $decode, $fallback);
$out = [];
$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']);
if ($addronly) {
$out[$j] = $address;
}
else {
$name = trim($val['name']);
$string = '';
if ($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] = ['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 = $fallback ?: self::get_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 = [];
$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[] = $text;
if (!empty($matches[$idx+1]) && ($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') {
$rest = '';
// base64 must be decoded a segment at a time.
// However, there are broken implementations that continue
// in the following word, we'll handle that (#6048)
for ($i=0; $i<$count; $i++) {
$chunk = $rest . $tmp[$i];
$length = strlen($chunk);
if ($length % 4) {
$length = floor($length / 4) * 4;
$rest = substr($chunk, $length);
$chunk = substr($chunk, 0, $length);
}
$text .= base64_decode($chunk);
}
}
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);
$tmp = [];
}
// add the last part of the input string
if ($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 $input;
}
}
/**
* Split RFC822 header string into an associative array
*/
public static function parse_headers($headers)
{
$result = [];
$headers = preg_replace('/\r?\n(\t| )+/', ' ', $headers);
$lines = explode("\n", $headers);
$count = count($lines);
for ($i=0; $i<$count; $i++) {
if ($p = strpos($lines[$i], ': ')) {
$field = strtolower(substr($lines[$i], 0, $p));
$value = trim(substr($lines[$i], $p+1));
if (!empty($value)) {
$result[$field] = $value;
}
}
}
return $result;
}
/**
* E-mail address list parser
*/
private static function parse_address_list($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);
// simplified regexp, supporting quoted local part
$email_rx = '([^\s:]+|("\s*(?:[^"\f\n\r\t\v\b\s]+\s*)+"))@\S+';
$result = [];
foreach ($str as $key => $val) {
$name = '';
$address = '';
$val = trim($val);
// First token might be a group name, ignore it
$tokens = self::explode_header_string(' ', $val);
if (isset($tokens[0]) && $tokens[0][strlen($tokens[0])-1] == ':') {
$val = substr($val, strlen($tokens[0]));
}
if (preg_match('/(.*)<('.$email_rx.')$/', $val, $m)) {
// Note: There are cases like "Test<test@domain.tld" with no closing bracket,
// therefor we do not include it in the regexp above, but we have to
// remove it later, because $email_rx will catch it (#8164)
$address = rtrim($m[2], '>');
$name = trim($m[1]);
}
else if (preg_match('/^('.$email_rx.')$/', $val, $m)) {
$address = $m[1];
$name = '';
}
// special case (#1489092)
else if (preg_match('/(\s*<MAILER-DAEMON>)$/', $val, $m)) {
$address = 'MAILER-DAEMON';
$name = substr($val, 0, -strlen($m[1]));
}
else if (preg_match('/('.$email_rx.')/', $val, $m)) {
$name = $m[1];
}
else {
$name = $val;
}
// unquote and/or decode name
if ($name) {
// An unquoted name ending with colon is a address group name, ignore it
if ($name[strlen($name)-1] == ':') {
$name = '';
}
if (strlen($name) > 1 && $name[0] == '"' && $name[strlen($name)-1] == '"') {
$name = substr($name, 1, -1);
$name = stripslashes($name);
}
if ($decode) {
$name = self::decode_header($name, $fallback);
// some clients encode addressee name with quotes around it
if (strlen($name) > 1 && $name[0] == '"' && $name[strlen($name)-1] == '"') {
$name = substr($name, 1, -1);
}
}
}
if (!$address && $name) {
$address = $name;
$name = '';
}
if ($address) {
$address = self::fix_email($address);
$result[$key] = ['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 = [];
$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
* @param string $mark Mark each flowed line with specified character
* @param bool $delsp Remove the trailing space of each flowed line
*
* @return string Interpreted text with unwrapped lines and stuffed space removed
*/
public static function unfold_flowed($text, $mark = null, $delsp = false)
{
$text = preg_split('/\r?\n/', $text);
$last = -1;
$q_level = 0;
$marks = [];
foreach ($text as $idx => $line) {
if ($q = strspn($line, '>')) {
// remove quote chars
$line = substr($line, $q);
// remove (optional) space-staffing
if (isset($line[0]) && $line[0] === ' ') {
$line = substr($line, 1);
}
// The same paragraph (We join current line with the previous one) when:
// - the same level of quoting
// - previous line was flowed
// - previous line contains more than only one single space (and quote char(s))
if ($q == $q_level
&& isset($text[$last]) && $text[$last][strlen($text[$last])-1] == ' '
&& !preg_match('/^>+ {0,1}$/', $text[$last])
) {
if ($delsp) {
$text[$last] = substr($text[$last], 0, -1);
}
$text[$last] .= $line;
unset($text[$idx]);
if ($mark) {
$marks[$last] = true;
}
}
else {
$last = $idx;
}
}
else {
if ($line == '-- ') {
$last = $idx;
}
else {
// remove space-stuffing
if (isset($line[0]) && $line[0] === ' ') {
$line = substr($line, 1);
}
$last_len = isset($text[$last]) ? strlen($text[$last]) : 0;
if (
$last_len && $line && !$q_level && $text[$last] != '-- '
&& isset($text[$last][$last_len-1]) && $text[$last][$last_len-1] == ' '
) {
if ($delsp) {
$text[$last] = substr($text[$last], 0, -1);
}
$text[$last] .= $line;
unset($text[$idx]);
if ($mark) {
$marks[$last] = true;
}
}
else {
$text[$idx] = $line;
$last = $idx;
}
}
}
$q_level = $q;
}
if (!empty($marks)) {
foreach (array_keys($marks) as $mk) {
$text[$mk] = $mark . $text[$mk];
}
}
return implode("\r\n", $text);
}
/**
* Wrap the given text to comply with RFC 2646
*
* @param string $text Text to wrap
* @param int $length Length
* @param string $charset Character encoding of $text
*
* @return string Wrapped text
*/
public static function format_flowed($text, $length = 72, $charset = null)
{
$text = preg_split('/\r?\n/', $text);
foreach ($text as $idx => $line) {
if ($line != '-- ') {
if ($level = strspn($line, '>')) {
// remove quote chars
$line = substr($line, $level);
// remove (optional) space-staffing and spaces before the line end
$line = rtrim($line, ' ');
if (isset($line[0]) && $line[0] === ' ') {
$line = substr($line, 1);
}
$prefix = str_repeat('>', $level) . ' ';
$line = $prefix . self::wordwrap($line, $length - $level - 2, " \r\n$prefix", false, $charset);
}
else if ($line) {
$line = self::wordwrap(rtrim($line), $length - 2, " \r\n", false, $charset);
// space-stuffing
$line = preg_replace('/(^|\r\n)(From| |>)/', '\\1 \\2', $line);
}
$text[$idx] = $line;
}
}
return implode("\r\n", $text);
}
/**
* Improved wordwrap function with multibyte support.
* The code is based on Zend_Text_MultiByte::wordWrap().
*
* @param string $string Text to wrap
* @param int $width Line width
* @param string $break Line separator
* @param bool $cut Enable to cut word
* @param string $charset Charset of $string
* @param bool $wrap_quoted When enabled quoted lines will not be wrapped
*
* @return string Text
*/
public static function wordwrap($string, $width = 75, $break = "\n", $cut = false, $charset = null, $wrap_quoted = true)
{
// Note: Never try to use iconv instead of mbstring functions here
// Iconv's substr/strlen are 100x slower (#1489113)
if ($charset && $charset != RCUBE_CHARSET) {
$charset = rcube_charset::parse_charset($charset);
mb_internal_encoding($charset);
}
// Convert \r\n to \n, this is our line-separator
$string = str_replace("\r\n", "\n", $string);
$separator = "\n"; // must be 1 character length
$result = [];
while (($stringLength = mb_strlen($string)) > 0) {
$breakPos = mb_strpos($string, $separator, 0);
// quoted line (do not wrap)
if ($wrap_quoted && $string[0] == '>') {
if ($breakPos === $stringLength - 1 || $breakPos === false) {
$subString = $string;
$cutLength = null;
}
else {
$subString = mb_substr($string, 0, $breakPos);
$cutLength = $breakPos + 1;
}
}
// next line found and current line is shorter than the limit
else if ($breakPos !== false && $breakPos < $width) {
if ($breakPos === $stringLength - 1) {
$subString = $string;
$cutLength = null;
}
else {
$subString = mb_substr($string, 0, $breakPos);
$cutLength = $breakPos + 1;
}
}
else {
$subString = mb_substr($string, 0, $width);
// last line
if ($breakPos === false && $subString === $string) {
$cutLength = null;
}
else {
$nextChar = mb_substr($string, $width, 1);
if ($nextChar === ' ' || $nextChar === $separator) {
$afterNextChar = mb_substr($string, $width + 1, 1);
// Note: mb_substr() does never return False
if ($afterNextChar === false || $afterNextChar === '') {
$subString .= $nextChar;
}
$cutLength = mb_strlen($subString) + 1;
}
else {
$spacePos = mb_strrpos($subString, ' ', 0);
if ($spacePos !== false) {
$subString = mb_substr($subString, 0, $spacePos);
$cutLength = $spacePos + 1;
}
else if ($cut === false) {
$spacePos = mb_strpos($string, ' ', 0);
if ($spacePos !== false && ($breakPos === false || $spacePos < $breakPos)) {
$subString = mb_substr($string, 0, $spacePos);
$cutLength = $spacePos + 1;
}
else if ($breakPos === false) {
$subString = $string;
$cutLength = null;
}
else {
$subString = mb_substr($string, 0, $breakPos);
$cutLength = $breakPos + 1;
}
}
else {
$cutLength = $width;
}
}
}
}
$result[] = $subString;
if ($cutLength !== null) {
$string = mb_substr($string, $cutLength, ($stringLength - $cutLength));
}
else {
break;
}
}
if ($charset && $charset != RCUBE_CHARSET) {
mb_internal_encoding(RCUBE_CHARSET);
}
return implode($break, $result);
}
/**
* A method to guess the mime_type of an attachment.
*
* @param string $path Path to the file or file contents
* @param string $name File name (with suffix)
* @param string $failover Mime type supplied for failover
* @param bool $is_stream Set to True if $path contains file contents
* @param bool $skip_suffix Set to True if the config/mimetypes.php map should be ignored
*
* @return string
* @author Till Klampaeckel <till@php.net>
* @see http://de2.php.net/manual/en/ref.fileinfo.php
* @see http://de2.php.net/mime_content_type
*/
public static function file_content_type($path, $name, $failover = 'application/octet-stream', $is_stream = false, $skip_suffix = false)
{
$mime_type = null;
$config = rcube::get_instance()->config;
// Detect mimetype using filename extension
if (!$skip_suffix) {
$mime_type = self::file_ext_type($name);
}
// try fileinfo extension if available
if (!$mime_type && function_exists('finfo_open')) {
$mime_magic = $config->get('mime_magic');
// null as a 2nd argument should be the same as no argument
// this however is not true on all systems/versions
if ($mime_magic) {
$finfo = finfo_open(FILEINFO_MIME, $mime_magic);
}
else {
$finfo = finfo_open(FILEINFO_MIME);
}
if ($finfo) {
$func = $is_stream ? 'finfo_buffer' : 'finfo_file';
$mime_type = $func($finfo, $path, FILEINFO_MIME_TYPE);
finfo_close($finfo);
}
}
// try PHP's mime_content_type
if (!$mime_type && !$is_stream && function_exists('mime_content_type')) {
$mime_type = @mime_content_type($path);
}
// fall back to user-submitted string
if (!$mime_type) {
$mime_type = $failover;
}
return $mime_type;
}
/**
* File type detection based on file name only.
*
* @param string $filename Path to the file or file contents
*
* @return string|null Mimetype label
*/
public static function file_ext_type($filename)
{
static $mime_ext = [];
if (empty($mime_ext)) {
foreach (rcube::get_instance()->config->resolve_paths('mimetypes.php') as $fpath) {
$mime_ext = array_merge($mime_ext, (array) @include($fpath));
}
}
// use file name suffix with hard-coded mime-type map
if (!empty($mime_ext) && $filename) {
$ext = strtolower(pathinfo($filename, PATHINFO_EXTENSION));
if ($ext && !empty($mime_ext[$ext])) {
return $mime_ext[$ext];
}
}
}
/**
* Get mimetype => file extension mapping
*
* @param string Mime-Type to get extensions for
*
* @return array List of extensions matching the given mimetype or a hash array
* with ext -> mimetype mappings if $mimetype is not given
*/
public static function get_mime_extensions($mimetype = null)
{
static $mime_types, $mime_extensions;
// return cached data
if (is_array($mime_types)) {
return $mimetype ? (isset($mime_types[$mimetype]) ? $mime_types[$mimetype] : []) : $mime_extensions;
}
// load mapping file
$file_paths = [];
if ($mime_types = rcube::get_instance()->config->get('mime_types')) {
$file_paths[] = $mime_types;
}
// try common locations
if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') {
$file_paths[] = 'C:/xampp/apache/conf/mime.types.';
}
else {
$file_paths[] = '/etc/mime.types';
$file_paths[] = '/etc/httpd/mime.types';
$file_paths[] = '/etc/httpd2/mime.types';
$file_paths[] = '/etc/apache/mime.types';
$file_paths[] = '/etc/apache2/mime.types';
$file_paths[] = '/etc/nginx/mime.types';
$file_paths[] = '/usr/local/etc/httpd/conf/mime.types';
$file_paths[] = '/usr/local/etc/apache/conf/mime.types';
$file_paths[] = '/usr/local/etc/apache24/mime.types';
}
$mime_types = [];
$mime_extensions = [];
$lines = [];
$regex = "/([\w\+\-\.\/]+)\s+([\w\s]+)/i";
foreach ($file_paths as $fp) {
if (@is_readable($fp)) {
$lines = file($fp, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
break;
}
}
foreach ($lines as $line) {
// skip comments or mime types w/o any extensions
if ($line[0] == '#' || !preg_match($regex, $line, $matches)) {
continue;
}
$mime = $matches[1];
foreach (explode(' ', $matches[2]) as $ext) {
$ext = trim($ext);
$mime_types[$mime][] = $ext;
$mime_extensions[$ext] = $mime;
}
}
// fallback to some well-known types most important for daily emails
if (empty($mime_types)) {
foreach (rcube::get_instance()->config->resolve_paths('mimetypes.php') as $fpath) {
$mime_extensions = array_merge($mime_extensions, (array) @include($fpath));
}
foreach ($mime_extensions as $ext => $mime) {
$mime_types[$mime][] = $ext;
}
}
// Add some known aliases that aren't included by some mime.types (#1488891)
// the order is important here so standard extensions have higher prio
$aliases = [
'image/gif' => ['gif'],
'image/png' => ['png'],
'image/x-png' => ['png'],
'image/jpeg' => ['jpg', 'jpeg', 'jpe'],
'image/jpg' => ['jpg', 'jpeg', 'jpe'],
'image/pjpeg' => ['jpg', 'jpeg', 'jpe'],
'image/tiff' => ['tif'],
'image/bmp' => ['bmp'],
'image/x-ms-bmp' => ['bmp'],
'message/rfc822' => ['eml'],
'text/x-mail' => ['eml'],
];
foreach ($aliases as $mime => $exts) {
if (isset($mime_types[$mime])) {
$mime_types[$mime] = array_unique(array_merge((array) $mime_types[$mime], $exts));
}
else {
$mime_types[$mime] = $exts;
}
foreach ($exts as $ext) {
if (!isset($mime_extensions[$ext])) {
$mime_extensions[$ext] = $mime;
}
}
}
if ($mimetype) {
return !empty($mime_types[$mimetype]) ? $mime_types[$mimetype] : [];
}
return $mime_extensions;
}
/**
* Detect image type of the given binary data by checking magic numbers.
*
* @param string $data Binary file content
*
* @return string Detected mime-type or jpeg as fallback
*/
public static function image_content_type($data)
{
$type = 'jpeg';
if (preg_match('/^\x89\x50\x4E\x47/', $data)) $type = 'png';
else if (preg_match('/^\x47\x49\x46\x38/', $data)) $type = 'gif';
else if (preg_match('/^\x00\x00\x01\x00/', $data)) $type = 'ico';
// else if (preg_match('/^\xFF\xD8\xFF\xE0/', $data)) $type = 'jpeg';
return 'image/' . $type;
}
/**
* Try to fix invalid email addresses
*/
public static function fix_email($email)
{
$parts = rcube_utils::explode_quoted_string('@', $email);
foreach ($parts as $idx => $part) {
// remove redundant quoting (#1490040)
if (isset($part[0]) && $part[0] == '"' && preg_match('/^"([a-zA-Z0-9._+=-]+)"$/', $part, $m)) {
$parts[$idx] = $m[1];
}
}
return implode('@', $parts);
}
/**
* Fix mimetype name.
*
* @param string $type Mimetype
*
* @return string Mimetype
*/
public static function fix_mimetype($type)
{
$type = strtolower(trim($type));
$aliases = [
'image/x-ms-bmp' => 'image/bmp', // #4771
'pdf' => 'application/pdf', // #6816
];
if (!empty($aliases[$type])) {
return $aliases[$type];
}
// Some versions of Outlook create garbage Content-Type:
// application/pdf.A520491B_3BF7_494D_8855_7FAC2C6C0608
if (preg_match('/^application\/pdf.+/', $type)) {
return 'application/pdf';
}
// treat image/pjpeg (image/pjpg, image/jpg) as image/jpeg (#4196)
if (preg_match('/^image\/p?jpe?g$/', $type)) {
return 'image/jpeg';
}
return $type;
}
}

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