Range download support

ajax/genesis.php

@@ -12,30 +12,12 @@
 // hardcoding the served file with /welcome.odt for now is enough to unblock development
 // (that saves all db work for now)
 
+namespace OCA\Office;
+
 // Check if we are a user
-OCP\User::checkLoggedIn();
+\OCP\User::checkLoggedIn();
 
 $filename = "/welcome.odt";
 
-if(!\OC\Files\Filesystem::file_exists($filename)) {
-	header("HTTP/1.0 404 Not Found");
-	$tmpl = new OCP\Template( '', '404', 'guest' );
-	$tmpl->assign('file', $filename);
-	$tmpl->printPage();
-	exit;
-}
-
-$ftype=\OC\Files\Filesystem::getMimeType( $filename );
-
-header('Content-Type:'.$ftype);
-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) ) . '"' );
-}
-OCP\Response::disableCaching();
-header('Content-Length: '.\OC\Files\Filesystem::filesize($filename));
-
-OC_Util::obEnd();
-\OC\Files\Filesystem::readfile( $filename );
+$download = new Download($filename);
+$download->sendResponse();

appinfo/app.php

@@ -33,4 +33,6 @@ OCP\App::addNavigationEntry(array(
 	'name' => 'Office')
 );
 
-OC::$CLASSPATH['OCA\Office\Storage'] = 'office/lib/storage.php';
+OC::$CLASSPATH['OCA\Office\Storage'] = 'office/lib/storage.php';
+OC::$CLASSPATH['OCA\Office\Download\Simple'] = 'office/lib/download/simple.php';
+OC::$CLASSPATH['OCA\Office\Download\Range'] = 'office/lib/download/range.php';

lib/download.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace OCA\Office;
+
+class Download {
+
+	// File to be served
+	protected $filepath;
+	
+	protected $instance;
+
+	public function __construct($filepath){
+		$this->filepath = $filepath;
+        if (isset($_SERVER['HTTP_RANGE'])) {
+			$this->instance = new Download\Range($filepath);
+		} else {
+			$this->instance = new Download\Simple($filepath);
+		}
+	}
+	
+	public function sendResponse(){
+		\OCP\Response::disableCaching();
+		
+		if (!$this->fileExists()){
+			$this->sendNotFound();
+		}
+		
+		$this->instance->sendResponse();
+		exit();
+	}
+
+	protected function getFilename(){
+		return basename($this->filepath);
+	}
+	
+	protected function getFilesize(){
+		return \OC\Files\Filesystem::filesize($this->filepath);
+	}
+	
+	protected function getMimeType(){
+		return \OC\Files\Filesystem::getMimeType($this->filepath);
+	}
+	
+	protected function fileExists(){
+		return \OC\Files\Filesystem::file_exists($this->filepath);
+	}
+
+	protected function sendNotFound(){
+		header("HTTP/1.0 404 Not Found");
+		$tmpl = new OCP\Template('', '404', 'guest');
+		$tmpl->assign('file', $this->filepath);
+		$tmpl->printPage();
+		exit;
+	}
+
+}

lib/download/range.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace OCA\Office\Download;
+
+class Range extends \OCA\Office\Download {
+
+	// Start of the range
+	protected $start;
+	// End of the range
+	protected $end;
+
+	public function __construct($filepath){
+		$this->filepath = $filepath;
+	}
+
+	public function sendResponse(){
+		if (!preg_match('/^bytes=\d*-\d*(,\d*-\d*)*$/', $_SERVER['HTTP_RANGE'])){
+			$this->sendNotSatisfiable();
+		}
+		$ranges = explode(',', substr($_SERVER['HTTP_RANGE'], 6));
+		foreach ($ranges as $range){
+			$parts = explode('-', $range);
+			if (isset($parts[0])){
+				$start = $parts[0];
+			} else {
+				$start = 0;
+			}
+
+			if (isset($parts[1])){
+				$end = $parts[1];
+			} else {
+				$end = $this->getFilesize() - 1;
+			}
+
+			if ($start > $end){
+				$this->sendNotSatisfiable();
+			}
+
+			$handle = \OC\Files\Filesystem::fopen($this->filepath, 'r');
+			\fseek($handle, $start);
+			$buffer = \fread($handle, $end - $start);
+			$md5Sum = md5($buffer);
+			\fclose($handle);
+			// send the headers and data 
+			header("Content-Length: " . $end - $start);
+			header("Content-md5: " . $md5Sum);
+			header("Accept-Ranges: bytes");
+			header('Content-Range: bytes ' . $start . '-' . ($end) . '/' . $this->getFilesize());
+			header("Connection: close");
+			header("Content-type: " . $this->getMimeType());
+			header('Content-Disposition: attachment; filename=' . $this->getFilename());
+			echo $buffer;
+			flush();
+		}
+	}
+
+	protected function sendNotSatisfiable(){
+		header('HTTP/1.1 416 Requested Range Not Satisfiable');
+		header('Content-Range: bytes */' . $this->getFilesize()); // Required in 416.
+		exit;
+	}
+
+}

lib/download/simple.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace OCA\Office\Download;
+
+class Simple extends \OCA\Office\Download {
+	
+	public function __construct($filepath){
+		$this->filepath = $filepath;
+	}
+	
+	public function sendResponse(){
+		header( 'Content-Type:' . $this->getMimeType() );
+		
+		$encodedName = rawurlencode($this->getFilename());
+		if (preg_match("/MSIE/", $_SERVER["HTTP_USER_AGENT"])){
+			header(
+					'Content-Disposition: attachment; filepath="' . $encodedName . '"'
+					);
+		} else {
+			header('Content-Disposition: attachment; filepath*=UTF-8\'\'' . $encodedName
+					. '; filepath="' . $encodedName . '"');
+		}
+		
+		header('Content-Length: ' . \OC\Files\Filesystem::filesize($this->filepath));
+
+		\OC_Util::obEnd();
+		\OC\Files\Filesystem::readfile($this->filepath);
+		exit();
+	}
+
+}