Add X-Accel-Redirect support for Nginx (a sibiling of X-Sendfile)

For it to work you have to modify your nginx conf to send X-Accel-Mapping header using
-> proxy_set_header X-Accel-Mapping /var/www/ajaxplorer/data/=/data/;
or
-> fastcgi_param X-Accel-Mapping /var/www/ajaxplorer/data/=/data/;
and you have to use the "internal" keyword
-> location ~ /data/ { internal; }

The X-Accel-Mapping idea come from the rails world

core/src/plugins/access.fs/class.fsAccessDriver.php

@@ -1236,6 +1236,22 @@ function readFile($filePathOrData, $headerType="plain", $localName="", $data=fal
                 header('Content-Disposition: attachment; filename="' . basename($filePathOrData) . '"');
                 return;
             }
+	if($this->getFilteredOption("USE_XACCELREDIRECT", $this->repository->getId()) && $this->wrapperClassName == "fsAccessWrapper" && array_key_exists("X-Accel-Mapping",$_SERVER)){
+		if(!$realfileSystem) $filePathOrData = fsAccessWrapper::getRealFSReference($filePathOrData);
+		$filePathOrData = str_replace("\\", "/", $filePathOrData);
+		$filePathOrData = SystemTextEncoding::toUTF8($filePathOrData);
+		$mapping = explode('=',$_SERVER['X-Accel-Mapping']);
+		$replacecount = 0;
+		$accelfile = str_replace($mapping[0],$mapping[1],$filePathOrData,$replacecount);
+		if($replacecount == 1){
+			header("X-Accel-Redirect: $accelfile");
+			header("Content-type: application/octet-stream");
+			header('Content-Disposition: attachment; filename="' . basename($accelfile) . '"');
+			return;
+		} else {
+			AJXP_Logger::logAction("error","Problem with X-Accel-Mapping for file $filePathOrData");
+		}
+	}
 			$stream = fopen("php://output", "a");
 			if($realfileSystem){
 				AJXP_Logger::debug("realFS!", array("file"=>$filePathOrData));

core/src/plugins/access.fs/manifest.xml

@@ -14,6 +14,7 @@
         <global_param name="PROBE_REAL_SIZE" type="boolean" label="CONF_MESSAGE[Real Size Probing]" description="CONF_MESSAGE[Use system command line to get the filesize instead of php built-in function (fixes the 2Go limitation)]" default="false"/>
         <global_param name="USE_POSIX" type="boolean" label="CONF_MESSAGE[Use POSIX]" description="CONF_MESSAGE[Use php POSIX extension to read files permissions. Only works on *nix systems.]" default="false"/>
         <global_param name="USE_XSENDFILE" type="boolean" label="CONF_MESSAGE[X-SendFile Active]" description="CONF_MESSAGE[Delegates all download operations to the webserver using the X-SendFile header. Warning, this is an external module to install for Apache. Module is active by default in Lighttpd. Warning, you have to manually add the folders where files will be downloaded in the module configuration (XSendFilePath directive)]" default="false"/>
+        <global_param name="USE_XACCELREDIRECT" type="boolean" label="CONF_MESSAGE[X-Accel-Redirect Active]" description="CONF_MESSAGE[Delegates all download operations to nginx using the X-Accel-Redirect header. Warning, you have to add some configuration in nginx, like X-Accel-Mapping]" default="false"/>
         <global_param group="MIXIN_MESSAGE[Metadata and indexation]" name="DEFAULT_METASOURCES" type="string" label="MIXIN_MESSAGE[Default Metasources]" description="MIXIN_MESSAGE[Comma separated list of metastore and meta plugins, that will be automatically applied to all repositories created with this driver]" mandatory="false" default="metastore.serial,meta.filehasher,index.lucene"/>
 	</server_settings>
 	<class_definition filename="plugins/access.fs/class.fsAccessDriver.php" classname="fsAccessDriver"/>
@@ -38,4 +39,4 @@
         </hooks>
 	</registry_contributions>
     <class_stream_wrapper filename="plugins/access.fs/class.fsAccessWrapper.php" classname="fsAccessWrapper" protocol="ajxp.fs"/>
-</ajxpdriver>
+</ajxpdriver>