david
28b02db2ea
git-svn-id: https://192.168.0.254/svn/Proyectos.Incam_SGD/tags/3.7.0.2_original@1 eb19766c-00d9-a042-a3a0-45cb8ec72764
220 lines
6.9 KiB
PHP
220 lines
6.9 KiB
PHP
<?php
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/**
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*
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* This does the download of a file based on the download_files table.
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*
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* KnowledgeTree Community Edition
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* Document Management Made Simple
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* Copyright (C) 2008, 2009 KnowledgeTree Inc.
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*
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 3 as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* You can contact KnowledgeTree Inc., PO Box 7775 #87847, San Francisco,
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* California 94120-7775, or email info@knowledgetree.com.
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*
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* The interactive user interfaces in modified source and object code versions
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* of this program must display Appropriate Legal Notices, as required under
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* Section 5 of the GNU General Public License version 3.
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*
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* In accordance with Section 7(b) of the GNU General Public License version 3,
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* these Appropriate Legal Notices must retain the display of the "Powered by
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* KnowledgeTree" logo and retain the original copyright notice. If the display of the
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* logo is not reasonably feasible for technical reasons, the Appropriate Legal Notices
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* must display the words "Powered by KnowledgeTree" and retain the original
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* copyright notice.
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* Contributor( s): Mark Holtzhausen
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*
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*/
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/*****************************************************************************************
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Includes
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*****************************************************************************************/
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require_once ('../../../config/dmsDefaults.php');
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require_once ('../../../ktapi/ktapi.inc.php');
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require_once ('../../../ktwebservice/KTDownloadManager.inc.php');
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/*****************************************************************************************
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Configuration
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*****************************************************************************************/
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define('MPDL_MIN_CHUNK_SIZE',1024); //The Minimum Chunk Size
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define('MPDL_JSON_PREFIX','JSON::'); //A Prefix to JSON Responses
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/*****************************************************************************************
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Function Definitions
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*****************************************************************************************/
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/**
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* Creates a JSON Error and outputs it
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*
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* @param $errorCode Unique Error Identifier
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* @param $errorTitle Error Title
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* @param $errorDescription Error Description
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* @param $data Additional Data Object for Error Tracing
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* @return void
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*/
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function error($errorCode=NULL,$errorTitle=NULL,$errorDescription=NULL,$data=NULL){
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$ret=array(
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'code' =>$errorCode,
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'title' =>$errorTitle,
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'description'=>$errorDescription,
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'data' =>$data
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);
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JSON_Out($ret);
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}
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/**
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* Outputs a JSON Response
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*
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* @param $obj The object comprising the response
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* @return void
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*/
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function JSON_Out($obj=NULL){
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echo MPDL_JSON_PREFIX.json_encode($obj);
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exit;
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}
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/**
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* Get the storage location of the document in question
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*
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* @param $docId The document ID
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* @param $hash The download code (hash)
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* @param $session The session ID
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* @param $appType The Application Type
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* @return String The physical location of the file
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*/
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function getFileName($docId=NULL,$hash=NULL,$session=NULL,$appType=NULL){
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$ktapi = &new KTAPI ( );
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if (PEAR::isError ( $ktapi ))error(14,'KTAPI Load Error','KTAPI Could not be loaded.',$ktapi);
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$res = $ktapi->get_active_session ( $session, null, $appType );
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if (PEAR::isError ( $res ))error(15,'KTAPI Session Error','KTAPI Could not be load session.',$res);
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$sql = "SELECT 1 FROM download_files WHERE hash=? AND session=? AND document_id=?";
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$rows = DBUtil::getResultArray ( array ($sql, array ($hash, $session, $docId ) ) );
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if (PEAR::isError ( $rows )) {error(99,'Unknown Error' , 'The SQL rendered an unknown error',$rows);}
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if (count ( $rows ) == 0) { error(1,'Not Authorized' , 'The requested download is not authorised.'); }
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$doc=$ktapi->get_document_by_id ( $docId );
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if (PEAR::isError ( $doc )) {error(16,'Document Load Error' , 'KTAPI Could not find the specified file.',$doc);}
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$fileName=$GLOBALS['default']->documentRoot.'/'.$doc->document->getStoragePath();
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return $fileName;
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}
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/**
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* Shuts down the download, returns status and clears the database download entry.
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*
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* @param $docId The document Id
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* @param $hash The download code (hash)
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* @param $session The Session Id
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* @return void
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*/
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function shutDownDownload($docId=NULL,$hash=NULL,$session=NULL){
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$sql = "DELETE FROM download_files WHERE hash='$hash' AND session='$session' AND document_id=$docId";
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$result = DBUtil::runQuery ( $sql );
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$ret=array(
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'completed' =>true
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);
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JSON_Out($ret);
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exit;
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}
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/**
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* Perform the download of a segment of the indicated file
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*
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* @param $fileName The file to download
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* @param $part The part to stream
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* @param $length The length of a part
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* @return void
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*/
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function downloadPart($fileName=NULL,$part=1,$length=1024){
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//Open file and send the bitstream representing the chosen segment
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try{
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$sPos=($part-1)*$length;
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$fp=fopen($fileName,'r');
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fseek($fp,$sPos,SEEK_SET);
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$res=fread($fp,$length);
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echo $res;
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exit;
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}catch(Exception $e){
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error(99,"Download Failed","Part {$fileName}({$part}) Failed",$e);
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}
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}
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/*****************************************************************************************
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Process The download(s)
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*****************************************************************************************/
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//Get download information
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$docId=$_GET['d'];
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$chunkSize=(int)(($_GET['chunkSize']>MPDL_MIN_CHUNK_SIZE)?$_GET['chunkSize']:MPDL_MIN_CHUNK_SIZE);
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$session_id=$_GET['u'];
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$hash=$_GET['code'];
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$part=(int)$_GET['part'];
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$appType = (isset ( $_GET ['apptype'] )) ? $_GET ['apptype'] : 'ws';
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//Error Checking Inputs
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if(!$docId)error(10,'Document ID Not Supplied');
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if(!$session_id)error(11,'Session ID Not Supplied');
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if(!$hash)error(12,'Hash (Code) Not Supplied');
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if(!$appType)error(13,'Application Type Not Supplied');
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//Get additional download information
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$fileName=getFileName($docId,$hash,$session_id,$appType);
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$fileSize=filesize($fileName);
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$partCount=ceil($fileSize/$chunkSize);
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//Handle the download request by means of watching parts
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if($part==0){
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//send back json obect with info about
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$response=array(
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'docId' =>$docId,
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'chunkSize' =>$chunkSize,
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'fileSize' =>$fileSize,
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'partCount' =>$partCount,
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'fileName' =>$fileName
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);
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JSON_Out($response);
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}elseif($part<=$partCount){
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//Get the relevant part and stream it to the browser
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downloadPart($fileName,$part,$chunkSize);
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exit;
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}else{
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//After maxparts, remove temp file, do database cleanup
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shutdownDownload($docId,$hash,$session_id);
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exit;
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}
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?>
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