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875 lines
30 KiB
PHP
875 lines
30 KiB
PHP
<?php
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/*
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+-----------------------------------------------------------------------+
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2005-2012, The Roundcube Dev Team |
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| Copyright (C) 2011-2012, Kolab Systems AG |
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| |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| |
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| PURPOSE: |
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| MIME message parsing utilities |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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| Author: Aleksander Machniak <alec@alec.pl> |
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+-----------------------------------------------------------------------+
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*/
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/**
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* Class for parsing MIME messages
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*
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* @package Framework
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* @subpackage Storage
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* @author Thomas Bruederli <roundcube@gmail.com>
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* @author Aleksander Machniak <alec@alec.pl>
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*/
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class rcube_mime
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{
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private static $default_charset;
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/**
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* Object constructor.
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*/
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function __construct($default_charset = null)
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{
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self::$default_charset = $default_charset;
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}
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/**
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* Returns message/object character set name
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*
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* @return string Characted set name
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*/
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public static function get_charset()
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{
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if (self::$default_charset) {
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return self::$default_charset;
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}
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if ($charset = rcube::get_instance()->config->get('default_charset')) {
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return $charset;
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}
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return RCUBE_CHARSET;
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}
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/**
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* Parse the given raw message source and return a structure
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* of rcube_message_part objects.
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*
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* It makes use of the PEAR:Mail_mimeDecode library
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*
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* @param string The message source
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* @return object rcube_message_part The message structure
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*/
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public static function parse_message($raw_body)
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{
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$mime = new Mail_mimeDecode($raw_body);
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$struct = $mime->decode(array('include_bodies' => true, 'decode_bodies' => true));
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return self::structure_part($struct);
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}
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/**
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* Recursive method to convert a Mail_mimeDecode part into a rcube_message_part object
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*
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* @param object A message part struct
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* @param int Part count
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* @param string Parent MIME ID
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*
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* @return object rcube_message_part
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*/
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private static function structure_part($part, $count=0, $parent='')
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{
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$struct = new rcube_message_part;
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$struct->mime_id = $part->mime_id ? $part->mime_id : (empty($parent) ? (string)$count : "$parent.$count");
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$struct->headers = $part->headers;
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$struct->ctype_primary = $part->ctype_primary;
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$struct->ctype_secondary = $part->ctype_secondary;
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$struct->mimetype = $part->ctype_primary . '/' . $part->ctype_secondary;
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$struct->ctype_parameters = $part->ctype_parameters;
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if ($part->headers['content-transfer-encoding'])
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$struct->encoding = $part->headers['content-transfer-encoding'];
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if ($part->ctype_parameters['charset'])
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$struct->charset = $part->ctype_parameters['charset'];
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$part_charset = $struct->charset ? $struct->charset : self::get_charset();
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// determine filename
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if (($filename = $part->d_parameters['filename']) || ($filename = $part->ctype_parameters['name'])) {
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$struct->filename = rcube_mime::decode_mime_string($filename, $part_charset);
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}
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// copy part body and convert it to UTF-8 if necessary
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$struct->body = $part->ctype_primary == 'text' || !$part->ctype_parameters['charset'] ? rcube_charset::convert($part->body, $part_charset) : $part->body;
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$struct->size = strlen($part->body);
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$struct->disposition = $part->disposition;
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foreach ((array)$part->parts as $child_part) {
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$struct->parts[] = self::structure_part($child_part, ++$count, $struct->mime_id);
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}
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return $struct;
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}
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/**
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* Split an address list into a structured array list
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*
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* @param string $input Input string
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* @param int $max List only this number of addresses
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* @param boolean $decode Decode address strings
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* @param string $fallback Fallback charset if none specified
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* @param boolean $addronly Return flat array with e-mail addresses only
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*
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* @return array Indexed list of addresses
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*/
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static function decode_address_list($input, $max = null, $decode = true, $fallback = null, $addronly = false)
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{
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$a = self::parse_address_list($input, $decode, $fallback);
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$out = array();
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$j = 0;
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// Special chars as defined by RFC 822 need to in quoted string (or escaped).
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$special_chars = '[\(\)\<\>\\\.\[\]@,;:"]';
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if (!is_array($a))
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return $out;
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foreach ($a as $val) {
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$j++;
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$address = trim($val['address']);
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if ($addronly) {
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$out[$j] = $address;
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}
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else {
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$name = trim($val['name']);
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if ($name && $address && $name != $address)
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$string = sprintf('%s <%s>', preg_match("/$special_chars/", $name) ? '"'.addcslashes($name, '"').'"' : $name, $address);
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else if ($address)
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$string = $address;
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else if ($name)
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$string = $name;
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$out[$j] = array('name' => $name, 'mailto' => $address, 'string' => $string);
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}
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if ($max && $j==$max)
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break;
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}
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return $out;
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}
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/**
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* Decode a message header value
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*
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* @param string $input Header value
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* @param string $fallback Fallback charset if none specified
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*
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* @return string Decoded string
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*/
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public static function decode_header($input, $fallback = null)
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{
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$str = self::decode_mime_string((string)$input, $fallback);
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return $str;
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}
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/**
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* Decode a mime-encoded string to internal charset
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*
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* @param string $input Header value
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* @param string $fallback Fallback charset if none specified
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*
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* @return string Decoded string
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*/
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public static function decode_mime_string($input, $fallback = null)
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{
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$default_charset = !empty($fallback) ? $fallback : self::get_charset();
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// rfc: all line breaks or other characters not found
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// in the Base64 Alphabet must be ignored by decoding software
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// delete all blanks between MIME-lines, differently we can
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// receive unnecessary blanks and broken utf-8 symbols
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$input = preg_replace("/\?=\s+=\?/", '?==?', $input);
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// encoded-word regexp
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$re = '/=\?([^?]+)\?([BbQq])\?([^\n]*?)\?=/';
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// Find all RFC2047's encoded words
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if (preg_match_all($re, $input, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER)) {
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// Initialize variables
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$tmp = array();
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$out = '';
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$start = 0;
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foreach ($matches as $idx => $m) {
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$pos = $m[0][1];
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$charset = $m[1][0];
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$encoding = $m[2][0];
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$text = $m[3][0];
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$length = strlen($m[0][0]);
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// Append everything that is before the text to be decoded
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if ($start != $pos) {
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$substr = substr($input, $start, $pos-$start);
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$out .= rcube_charset::convert($substr, $default_charset);
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$start = $pos;
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}
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$start += $length;
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// Per RFC2047, each string part "MUST represent an integral number
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// of characters . A multi-octet character may not be split across
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// adjacent encoded-words." However, some mailers break this, so we
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// try to handle characters spanned across parts anyway by iterating
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// through and aggregating sequential encoded parts with the same
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// character set and encoding, then perform the decoding on the
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// aggregation as a whole.
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$tmp[] = $text;
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if ($next_match = $matches[$idx+1]) {
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if ($next_match[0][1] == $start
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&& $next_match[1][0] == $charset
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&& $next_match[2][0] == $encoding
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) {
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continue;
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}
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}
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$count = count($tmp);
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$text = '';
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// Decode and join encoded-word's chunks
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if ($encoding == 'B' || $encoding == 'b') {
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// base64 must be decoded a segment at a time
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for ($i=0; $i<$count; $i++)
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$text .= base64_decode($tmp[$i]);
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}
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else { //if ($encoding == 'Q' || $encoding == 'q') {
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// quoted printable can be combined and processed at once
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for ($i=0; $i<$count; $i++)
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$text .= $tmp[$i];
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$text = str_replace('_', ' ', $text);
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$text = quoted_printable_decode($text);
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}
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$out .= rcube_charset::convert($text, $charset);
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$tmp = array();
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}
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// add the last part of the input string
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if ($start != strlen($input)) {
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$out .= rcube_charset::convert(substr($input, $start), $default_charset);
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}
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// return the results
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return $out;
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}
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// no encoding information, use fallback
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return rcube_charset::convert($input, $default_charset);
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}
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/**
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* Decode a mime part
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*
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* @param string $input Input string
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* @param string $encoding Part encoding
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* @return string Decoded string
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*/
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public static function decode($input, $encoding = '7bit')
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{
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switch (strtolower($encoding)) {
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case 'quoted-printable':
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return quoted_printable_decode($input);
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case 'base64':
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return base64_decode($input);
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case 'x-uuencode':
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case 'x-uue':
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case 'uue':
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case 'uuencode':
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return convert_uudecode($input);
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case '7bit':
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default:
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return $input;
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}
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}
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/**
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* Split RFC822 header string into an associative array
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* @access private
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*/
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public static function parse_headers($headers)
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{
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$a_headers = array();
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$headers = preg_replace('/\r?\n(\t| )+/', ' ', $headers);
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$lines = explode("\n", $headers);
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$c = count($lines);
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for ($i=0; $i<$c; $i++) {
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if ($p = strpos($lines[$i], ': ')) {
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$field = strtolower(substr($lines[$i], 0, $p));
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$value = trim(substr($lines[$i], $p+1));
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if (!empty($value))
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$a_headers[$field] = $value;
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}
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}
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return $a_headers;
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}
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/**
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* @access private
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*/
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private static function parse_address_list($str, $decode = true, $fallback = null)
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{
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// remove any newlines and carriage returns before
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$str = preg_replace('/\r?\n(\s|\t)?/', ' ', $str);
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// extract list items, remove comments
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$str = self::explode_header_string(',;', $str, true);
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$result = array();
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// simplified regexp, supporting quoted local part
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$email_rx = '(\S+|("\s*(?:[^"\f\n\r\t\v\b\s]+\s*)+"))@\S+';
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foreach ($str as $key => $val) {
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$name = '';
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$address = '';
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$val = trim($val);
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if (preg_match('/(.*)<('.$email_rx.')>$/', $val, $m)) {
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$address = $m[2];
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$name = trim($m[1]);
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}
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else if (preg_match('/^('.$email_rx.')$/', $val, $m)) {
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$address = $m[1];
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$name = '';
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}
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// special case (#1489092)
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else if (preg_match('/(\s*<MAILER-DAEMON>)$/', $val, $m)) {
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$address = 'MAILER-DAEMON';
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$name = substr($val, 0, -strlen($m[1]));
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}
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else {
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$name = $val;
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}
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// dequote and/or decode name
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if ($name) {
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if ($name[0] == '"' && $name[strlen($name)-1] == '"') {
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$name = substr($name, 1, -1);
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$name = stripslashes($name);
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}
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if ($decode) {
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$name = self::decode_header($name, $fallback);
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}
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}
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if (!$address && $name) {
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$address = $name;
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}
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if ($address) {
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$result[$key] = array('name' => $name, 'address' => $address);
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}
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}
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return $result;
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}
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/**
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* Explodes header (e.g. address-list) string into array of strings
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* using specified separator characters with proper handling
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* of quoted-strings and comments (RFC2822)
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*
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* @param string $separator String containing separator characters
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* @param string $str Header string
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* @param bool $remove_comments Enable to remove comments
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*
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* @return array Header items
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*/
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public static function explode_header_string($separator, $str, $remove_comments = false)
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{
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$length = strlen($str);
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$result = array();
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$quoted = false;
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$comment = 0;
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$out = '';
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for ($i=0; $i<$length; $i++) {
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// we're inside a quoted string
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if ($quoted) {
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if ($str[$i] == '"') {
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$quoted = false;
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}
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else if ($str[$i] == "\\") {
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if ($comment <= 0) {
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$out .= "\\";
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}
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$i++;
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}
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}
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// we are inside a comment string
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else if ($comment > 0) {
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if ($str[$i] == ')') {
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$comment--;
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}
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else if ($str[$i] == '(') {
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$comment++;
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}
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else if ($str[$i] == "\\") {
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$i++;
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}
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continue;
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}
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// separator, add to result array
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else if (strpos($separator, $str[$i]) !== false) {
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if ($out) {
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$result[] = $out;
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}
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$out = '';
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continue;
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}
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// start of quoted string
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else if ($str[$i] == '"') {
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$quoted = true;
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}
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// start of comment
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else if ($remove_comments && $str[$i] == '(') {
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$comment++;
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}
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if ($comment <= 0) {
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$out .= $str[$i];
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}
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}
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if ($out && $comment <= 0) {
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$result[] = $out;
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}
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return $result;
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}
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/**
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* Interpret a format=flowed message body according to RFC 2646
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*
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* @param string $text Raw body formatted as flowed text
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*
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* @return string Interpreted text with unwrapped lines and stuffed space removed
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*/
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public static function unfold_flowed($text)
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{
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$text = preg_split('/\r?\n/', $text);
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$last = -1;
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$q_level = 0;
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foreach ($text as $idx => $line) {
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if (preg_match('/^(>+)/', $line, $m)) {
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// remove quote chars
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$q = strlen($m[1]);
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$line = preg_replace('/^>+/', '', $line);
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// remove (optional) space-staffing
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$line = preg_replace('/^ /', '', $line);
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// The same paragraph (We join current line with the previous one) when:
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// - the same level of quoting
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// - previous line was flowed
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// - previous line contains more than only one single space (and quote char(s))
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if ($q == $q_level
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&& isset($text[$last]) && $text[$last][strlen($text[$last])-1] == ' '
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&& !preg_match('/^>+ {0,1}$/', $text[$last])
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) {
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$text[$last] .= $line;
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unset($text[$idx]);
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}
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else {
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$last = $idx;
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}
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}
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else {
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$q = 0;
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if ($line == '-- ') {
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$last = $idx;
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}
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else {
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// remove space-stuffing
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$line = preg_replace('/^\s/', '', $line);
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if (isset($text[$last]) && $line
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&& $text[$last] != '-- '
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&& $text[$last][strlen($text[$last])-1] == ' '
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) {
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$text[$last] .= $line;
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unset($text[$idx]);
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}
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else {
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$text[$idx] = $line;
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$last = $idx;
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}
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}
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}
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$q_level = $q;
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}
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return implode("\r\n", $text);
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}
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/**
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* Wrap the given text to comply with RFC 2646
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*
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* @param string $text Text to wrap
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* @param int $length Length
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* @param string $charset Character encoding of $text
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*
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* @return string Wrapped text
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*/
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public static function format_flowed($text, $length = 72, $charset=null)
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{
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$text = preg_split('/\r?\n/', $text);
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foreach ($text as $idx => $line) {
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if ($line != '-- ') {
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|
if (preg_match('/^(>+)/', $line, $m)) {
|
|
// remove quote chars
|
|
$level = strlen($m[1]);
|
|
$line = preg_replace('/^>+/', '', $line);
|
|
// remove (optional) space-staffing and spaces before the line end
|
|
$line = preg_replace('/(^ | +$)/', '', $line);
|
|
$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, $wrap_quoted=true)
|
|
{
|
|
if (!$charset) {
|
|
$charset = RCUBE_CHARSET;
|
|
}
|
|
|
|
// detect available functions
|
|
$strlen_func = function_exists('iconv_strlen') ? 'iconv_strlen' : 'mb_strlen';
|
|
$strpos_func = function_exists('iconv_strpos') ? 'iconv_strpos' : 'mb_strpos';
|
|
$strrpos_func = function_exists('iconv_strrpos') ? 'iconv_strrpos' : 'mb_strrpos';
|
|
$substr_func = function_exists('iconv_substr') ? 'iconv_substr' : 'mb_substr';
|
|
|
|
// Convert \r\n to \n, this is our line-separator
|
|
$string = str_replace("\r\n", "\n", $string);
|
|
$separator = "\n"; // must be 1 character length
|
|
$result = array();
|
|
|
|
while (($stringLength = $strlen_func($string, $charset)) > 0) {
|
|
$breakPos = $strpos_func($string, $separator, 0, $charset);
|
|
|
|
// quoted line (do not wrap)
|
|
if ($wrap_quoted && $string[0] == '>') {
|
|
if ($breakPos === $stringLength - 1 || $breakPos === false) {
|
|
$subString = $string;
|
|
$cutLength = null;
|
|
}
|
|
else {
|
|
$subString = $substr_func($string, 0, $breakPos, $charset);
|
|
$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 = $substr_func($string, 0, $breakPos, $charset);
|
|
$cutLength = $breakPos + 1;
|
|
}
|
|
}
|
|
else {
|
|
$subString = $substr_func($string, 0, $width, $charset);
|
|
|
|
// last line
|
|
if ($breakPos === false && $subString === $string) {
|
|
$cutLength = null;
|
|
}
|
|
else {
|
|
$nextChar = $substr_func($string, $width, 1, $charset);
|
|
|
|
if ($nextChar === ' ' || $nextChar === $separator) {
|
|
$afterNextChar = $substr_func($string, $width + 1, 1, $charset);
|
|
|
|
if ($afterNextChar === false) {
|
|
$subString .= $nextChar;
|
|
}
|
|
|
|
$cutLength = $strlen_func($subString, $charset) + 1;
|
|
}
|
|
else {
|
|
if ($strrpos_func[0] == 'm') {
|
|
$spacePos = $strrpos_func($subString, ' ', 0, $charset);
|
|
}
|
|
else {
|
|
$spacePos = $strrpos_func($subString, ' ', $charset);
|
|
}
|
|
|
|
if ($spacePos !== false) {
|
|
$subString = $substr_func($subString, 0, $spacePos, $charset);
|
|
$cutLength = $spacePos + 1;
|
|
}
|
|
else if ($cut === false) {
|
|
$spacePos = $strpos_func($string, ' ', 0, $charset);
|
|
|
|
if ($spacePos !== false && $spacePos < $breakPos) {
|
|
$subString = $substr_func($string, 0, $spacePos, $charset);
|
|
$cutLength = $spacePos + 1;
|
|
}
|
|
else {
|
|
$subString = $substr_func($string, 0, $breakPos, $charset);
|
|
$cutLength = $breakPos + 1;
|
|
}
|
|
}
|
|
else {
|
|
$subString = $substr_func($subString, 0, $width, $charset);
|
|
$cutLength = $width;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
$result[] = $subString;
|
|
|
|
if ($cutLength !== null) {
|
|
$string = $substr_func($string, $cutLength, ($stringLength - $cutLength), $charset);
|
|
}
|
|
else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return implode($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 boolean $is_stream Set to True if $path contains file contents
|
|
* @param boolean $skip_suffix Set to True if the config/mimetypes.php mappig should be ignored
|
|
*
|
|
* @return string
|
|
* @author Till Klampaeckel <till@php.net>
|
|
* @see http://de2.php.net/manual/en/ref.fileinfo.php
|
|
* @see http://de2.php.net/mime_content_type
|
|
*/
|
|
public static function file_content_type($path, $name, $failover = 'application/octet-stream', $is_stream = false, $skip_suffix = false)
|
|
{
|
|
$mime_type = null;
|
|
$mime_magic = rcube::get_instance()->config->get('mime_magic');
|
|
$mime_ext = $skip_suffix ? null : @include(RCUBE_CONFIG_DIR . '/mimetypes.php');
|
|
|
|
// use file name suffix with hard-coded mime-type map
|
|
if (is_array($mime_ext) && $name) {
|
|
if ($suffix = substr($name, strrpos($name, '.')+1)) {
|
|
$mime_type = $mime_ext[strtolower($suffix)];
|
|
}
|
|
}
|
|
|
|
// try fileinfo extension if available
|
|
if (!$mime_type && function_exists('finfo_open')) {
|
|
// null as a 2nd argument should be the same as no argument
|
|
// this however is not true on all systems/versions
|
|
if ($mime_magic) {
|
|
$finfo = finfo_open(FILEINFO_MIME, $mime_magic);
|
|
}
|
|
else {
|
|
$finfo = finfo_open(FILEINFO_MIME);
|
|
}
|
|
|
|
if ($finfo) {
|
|
if ($is_stream)
|
|
$mime_type = finfo_buffer($finfo, $path);
|
|
else
|
|
$mime_type = finfo_file($finfo, $path);
|
|
finfo_close($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;
|
|
}
|
|
else {
|
|
// Sometimes (PHP-5.3?) content-type contains charset definition,
|
|
// Remove it (#1487122) also "charset=binary" is useless
|
|
$mime_type = array_shift(preg_split('/[; ]/', $mime_type));
|
|
}
|
|
|
|
return $mime_type;
|
|
}
|
|
|
|
|
|
/**
|
|
* 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 ? $mime_types[$mimetype] : $mime_extensions;
|
|
}
|
|
|
|
// load mapping file
|
|
$file_paths = array();
|
|
|
|
if ($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[] = '/usr/local/etc/httpd/conf/mime.types';
|
|
$file_paths[] = '/usr/local/etc/apache/conf/mime.types';
|
|
}
|
|
|
|
foreach ($file_paths as $fp) {
|
|
if (is_readable($fp)) {
|
|
$lines = file($fp, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
|
|
break;
|
|
}
|
|
}
|
|
|
|
$mime_types = $mime_extensions = array();
|
|
$regex = "/([\w\+\-\.\/]+)\t+([\w\s]+)/i";
|
|
foreach((array)$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)) {
|
|
$mime_extensions = (array) @include(RCUBE_CONFIG_DIR . '/mimetypes.php');
|
|
|
|
foreach ($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
|
|
$aliases = array(
|
|
'image/gif' => array('gif'),
|
|
'image/png' => array('png'),
|
|
'image/x-png' => array('png'),
|
|
'image/jpeg' => array('jpg', 'jpeg', 'jpe'),
|
|
'image/jpg' => array('jpg', 'jpeg', 'jpe'),
|
|
'image/pjpeg' => array('jpg', 'jpeg', 'jpe'),
|
|
'image/tiff' => array('tif'),
|
|
'message/rfc822' => array('eml'),
|
|
'text/x-mail' => array('eml'),
|
|
);
|
|
|
|
foreach ($aliases as $mime => $exts) {
|
|
$mime_types[$mime] = array_unique(array_merge((array) $mime_types[$mime], $exts));
|
|
|
|
foreach ($exts as $ext) {
|
|
if (!isset($mime_extensions[$ext])) {
|
|
$mime_extensions[$ext] = $mime;
|
|
}
|
|
}
|
|
}
|
|
|
|
return $mimetype ? $mime_types[$mimetype] : $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;
|
|
}
|
|
|
|
}
|