/
FileMimeType.php
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/
FileMimeType.php
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<?php
/**
* Licensed to The Apereo Foundation under one or more contributor license
* agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
* The Apereo Foundation licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Use this to validate the mime type of a file.
*/
class Xerte_Validate_FileMimeType {
public static $allowableMimeTypeList = array();
protected $messages = array();
/**
* we need to know if the PHP env supports this validator.
*/
public static function canRun() {
return function_exists('mime_content_type');
}
/**
* @return boolean true if ok.
* @param string file name. e.g. /etc/passwd, /usr/bin/blah, c:/blah, /tmp/php_upload/blah
*/
public function isValid($file_name) {
$this->messages = array();
if(self::canRun()) {
if(file_exists($file_name)) {
$mime_type = mime_content_type($file_name);
if(in_array($mime_type, self::$allowableMimeTypeList)) {
return true;
}
$this->messages['INVALID_MIME_TYPE'] = "MIME type $mime_type is not an allowed type";
}
else {
$this->messages['FILE_NOT_FOUND'] = "File not found - $file_name";
}
}
else {
$this->messages['UNSUPPORTED'] = "Can't run - function: mime_content_type not found";
}
return false;
}
/**
* @return array of error messages (if any).
*/
public function getMessages() {
return $this->messages;
}
public function getErrors() {
return array_keys($this->messages);
}
}