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< ? php
/**
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* ownCloud
*
* @ author Frank Karlitschek
* @ copyright 2012 Frank Karlitschek frank @ owncloud . org
*
* This library is free software ; you can redistribute it and / or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation ; either
* version 3 of the License , or any later version .
*
* This library is distributed in the hope that it will be useful ,
* but WITHOUT ANY WARRANTY ; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE . See the
* GNU AFFERO GENERAL PUBLIC LICENSE for more details .
*
* You should have received a copy of the GNU Affero General Public
* License along with this library . If not , see < http :// www . gnu . org / licenses />.
*
*/
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/**
* Class for fileserver access
*
*/
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class OC_Files {
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static $tmpFiles = array ();
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static public function getFileInfo ( $path ){
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return \OC\Files\Filesystem :: getFileInfo ( $path );
}
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static public function getDirectoryContent ( $path ){
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return \OC\Files\Filesystem :: getDirectoryContent ( $path );
}
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/**
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* return the content of a file or return a zip file containning multiply files
*
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* @ param string $dir
* @ param string $file ; seperated list of files to download
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* @ param boolean $only_header ; boolean to only send header of the request
*/
public static function get ( $dir , $files , $only_header = false ) {
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$xsendfile = false ;
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if ( isset ( $_SERVER [ 'MOD_X_SENDFILE_ENABLED' ]) ||
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isset ( $_SERVER [ 'MOD_X_ACCEL_REDIRECT_ENABLED' ])) {
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$xsendfile = true ;
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}
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if ( strpos ( $files , ';' )) {
$files = explode ( ';' , $files );
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}
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if ( is_array ( $files )) {
self :: validateZipDownload ( $dir , $files );
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$executionTime = intval ( ini_get ( 'max_execution_time' ));
set_time_limit ( 0 );
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$zip = new ZipArchive ();
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if ( $xsendfile ) {
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$filename = OC_Helper :: tmpFileNoClean ( '.zip' );
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} else {
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$filename = OC_Helper :: tmpFile ( '.zip' );
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}
if ( $zip -> open ( $filename , ZIPARCHIVE :: CREATE | ZIPARCHIVE :: OVERWRITE ) !== true ) {
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exit ( " cannot open < $filename > \n " );
}
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foreach ( $files as $file ) {
$file = $dir . '/' . $file ;
if ( \OC\Files\Filesystem :: is_file ( $file )) {
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$tmpFile = \OC\Files\Filesystem :: toTmpFile ( $file );
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self :: $tmpFiles [] = $tmpFile ;
$zip -> addFile ( $tmpFile , basename ( $file ));
} elseif ( \OC\Files\Filesystem :: is_dir ( $file )) {
self :: zipAddDir ( $file , $zip );
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}
}
$zip -> close ();
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set_time_limit ( $executionTime );
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} elseif ( \OC\Files\Filesystem :: is_dir ( $dir . '/' . $files )) {
self :: validateZipDownload ( $dir , $files );
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$executionTime = intval ( ini_get ( 'max_execution_time' ));
set_time_limit ( 0 );
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$zip = new ZipArchive ();
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if ( $xsendfile ) {
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$filename = OC_Helper :: tmpFileNoClean ( '.zip' );
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} else {
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$filename = OC_Helper :: tmpFile ( '.zip' );
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}
if ( $zip -> open ( $filename , ZIPARCHIVE :: CREATE | ZIPARCHIVE :: OVERWRITE ) !== true ) {
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exit ( " cannot open < $filename > \n " );
}
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$file = $dir . '/' . $files ;
self :: zipAddDir ( $file , $zip );
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$zip -> close ();
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set_time_limit ( $executionTime );
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} else {
$zip = false ;
$filename = $dir . '/' . $files ;
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}
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OC_Util :: obEnd ();
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if ( $zip or \OC\Files\Filesystem :: isReadable ( $filename )) {
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if ( preg_match ( " /MSIE/ " , $_SERVER [ " HTTP_USER_AGENT " ] ) ) {
header ( 'Content-Disposition: attachment; filename="' . rawurlencode ( basename ( $filename ) ) . '"' );
} else {
header ( 'Content-Disposition: attachment; filename*=UTF-8\'\'' . rawurlencode ( basename ( $filename ) )
. '; filename="' . rawurlencode ( basename ( $filename ) ) . '"' );
}
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header ( 'Content-Transfer-Encoding: binary' );
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OC_Response :: disableCaching ();
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if ( $zip ) {
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ini_set ( 'zlib.output_compression' , 'off' );
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header ( 'Content-Type: application/zip' );
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header ( 'Content-Length: ' . filesize ( $filename ));
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self :: addSendfileHeader ( $filename );
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} else {
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header ( 'Content-Type: ' . \OC\Files\Filesystem :: getMimeType ( $filename ));
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header ( " Content-Length: " . \OC\Files\Filesystem :: filesize ( $filename ));
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list ( $storage ) = \OC\Files\Filesystem :: resolvePath ( $filename );
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if ( $storage instanceof \OC\File\Storage\Local ) {
self :: addSendfileHeader ( \OC\Files\Filesystem :: getLocalFile ( $filename ));
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}
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}
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} elseif ( $zip or ! \OC\Files\Filesystem :: file_exists ( $filename )) {
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header ( " HTTP/1.0 404 Not Found " );
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$tmpl = new OC_Template ( '' , '404' , 'guest' );
$tmpl -> assign ( 'file' , $filename );
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$tmpl -> printPage ();
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} else {
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header ( " HTTP/1.0 403 Forbidden " );
die ( '403 Forbidden' );
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}
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if ( $only_header ) {
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return ;
}
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if ( $zip ) {
$handle = fopen ( $filename , 'r' );
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if ( $handle ) {
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$chunkSize = 8 * 1024 ; // 1 MB chunks
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while ( ! feof ( $handle )) {
echo fread ( $handle , $chunkSize );
flush ();
}
}
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if ( ! $xsendfile ) {
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unlink ( $filename );
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}
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} else {
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\OC\Files\Filesystem :: readfile ( $filename );
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}
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foreach ( self :: $tmpFiles as $tmpFile ) {
if ( file_exists ( $tmpFile ) and is_file ( $tmpFile )) {
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unlink ( $tmpFile );
}
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}
}
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private static function addSendfileHeader ( $filename ) {
if ( isset ( $_SERVER [ 'MOD_X_SENDFILE_ENABLED' ])) {
header ( " X-Sendfile: " . $filename );
}
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if ( isset ( $_SERVER [ 'MOD_X_ACCEL_REDIRECT_ENABLED' ])) {
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header ( " X-Accel-Redirect: " . $filename );
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}
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}
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public static function zipAddDir ( $dir , $zip , $internalDir = '' ) {
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$dirname = basename ( $dir );
$zip -> addEmptyDir ( $internalDir . $dirname );
$internalDir .= $dirname .= '/' ;
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$files = OC_Files :: getDirectoryContent ( $dir );
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foreach ( $files as $file ) {
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$filename = $file [ 'name' ];
$file = $dir . '/' . $filename ;
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if ( \OC\Files\Filesystem :: is_file ( $file )) {
$tmpFile = \OC\Files\Filesystem :: toTmpFile ( $file );
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OC_Files :: $tmpFiles [] = $tmpFile ;
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$zip -> addFile ( $tmpFile , $internalDir . $filename );
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} elseif ( \OC\Files\Filesystem :: is_dir ( $file )) {
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self :: zipAddDir ( $file , $zip , $internalDir );
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}
}
}
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/**
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* checks if the selected files are within the size constraint . If not , outputs an error page .
*
* @ param dir $dir
* @ param files $files
*/
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static function validateZipDownload ( $dir , $files ) {
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if ( ! OC_Config :: getValue ( 'allowZipDownload' , true )) {
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$l = OC_L10N :: get ( 'lib' );
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header ( " HTTP/1.0 409 Conflict " );
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$tmpl = new OC_Template ( '' , 'error' , 'user' );
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$errors = array (
array (
'error' => $l -> t ( 'ZIP download is turned off.' ),
'hint' => $l -> t ( 'Files need to be downloaded one by one.' ) . '<br/><a href="javascript:history.back()">' . $l -> t ( 'Back to Files' ) . '</a>' ,
)
);
$tmpl -> assign ( 'errors' , $errors );
$tmpl -> printPage ();
exit ;
}
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$zipLimit = OC_Config :: getValue ( 'maxZipInputSize' , OC_Helper :: computerFileSize ( '800 MB' ));
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if ( $zipLimit > 0 ) {
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$totalsize = 0 ;
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if ( is_array ( $files )) {
foreach ( $files as $file ) {
$totalsize += \OC\Files\Filesystem :: filesize ( $dir . '/' . $file );
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}
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} else {
$totalsize += \OC\Files\Filesystem :: filesize ( $dir . '/' . $files );
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}
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if ( $totalsize > $zipLimit ) {
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$l = OC_L10N :: get ( 'lib' );
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header ( " HTTP/1.0 409 Conflict " );
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$tmpl = new OC_Template ( '' , 'error' , 'user' );
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$errors = array (
array (
'error' => $l -> t ( 'Selected files too large to generate zip file.' ),
'hint' => 'Download the files in smaller chunks, seperately or kindly ask your administrator.<br/><a href="javascript:history.back()">' . $l -> t ( 'Back to Files' ) . '</a>' ,
)
);
$tmpl -> assign ( 'errors' , $errors );
$tmpl -> printPage ();
exit ;
}
}
}
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/**
* set the maximum upload size limit for apache hosts using . htaccess
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*
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* @ param int size filesisze in bytes
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* @ return false on failure , size on success
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*/
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static function setUploadLimit ( $size ) {
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//don't allow user to break his config -- upper boundary
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if ( $size > PHP_INT_MAX ) {
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//max size is always 1 byte lower than computerFileSize returns
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if ( $size > PHP_INT_MAX + 1 )
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return false ;
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$size -= 1 ;
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} else {
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$size = OC_Helper :: humanFileSize ( $size );
$size = substr ( $size , 0 , - 1 ); //strip the B
$size = str_replace ( ' ' , '' , $size ); //remove the space between the size and the postfix
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}
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//don't allow user to break his config -- broken or malicious size input
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if ( intval ( $size ) == 0 ) {
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return false ;
}
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$htaccess = @ file_get_contents ( OC :: $SERVERROOT . '/.htaccess' ); //supress errors in case we don't have permissions for
if ( ! $htaccess ) {
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return false ;
}
$phpValueKeys = array (
'upload_max_filesize' ,
'post_max_size'
);
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foreach ( $phpValueKeys as $key ) {
$pattern = '/php_value ' . $key . ' (\S)*/' ;
$setting = 'php_value ' . $key . ' ' . $size ;
$hasReplaced = 0 ;
$content = preg_replace ( $pattern , $setting , $htaccess , 1 , $hasReplaced );
if ( $content !== null ) {
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$htaccess = $content ;
}
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if ( $hasReplaced == 0 ) {
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$htaccess .= " \n " . $setting ;
}
}
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//check for write permissions
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if ( is_writable ( OC :: $SERVERROOT . '/.htaccess' )) {
file_put_contents ( OC :: $SERVERROOT . '/.htaccess' , $htaccess );
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return OC_Helper :: computerFileSize ( $size );
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} else {
OC_Log :: write ( 'files' , 'Can\'t write upload limit to ' . OC :: $SERVERROOT . '/.htaccess. Please check the file permissions' , OC_Log :: WARN );
}
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return false ;
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}
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}