khanat-opennel-code/code/web/public_php/ams/func/install_plugin.php

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<?php
/**
* This function is used in installing plugins
* It performs validation check for the compressed plugin
* then extract in plugin folder to get the info
*
* @author Shubham Meena, mentored by Matthew Lagoe
*/
function install_plugin() {
$result = array();
// if logged in
if ( WebUsers :: isLoggedIn() ) {
// path of temporary folder for storing files
$temp_path = "../../ams_lib/temp";
// create a temp directory if not exist
// temp folder where we first store all uploaded plugins before install
if ( !file_exists( "$temp_path" ) )
{
mkdir( $temp_path );
}
// checking the server if file is uploaded or not
if ( ( isset( $_FILES["file"] ) ) && ( $_FILES["file"]["size"] > 0 ) )
{
$fileName = $_FILES["file"]["name"]; //the files name takes from the HTML form
$fileTmpLoc = $_FILES["file"]["tmp_name"]; //file in the PHP tmp folder
$dir = trim( $_FILES["file"]["name"], ".zip" );
$target_path = "../../ams_lib/plugins/$dir"; //path in which the zip extraction is to be done
$destination = "../../ams_lib/plugins/";
// scanning plugin folder if plugin with same name is already exists or not
$x = checkForUpdate( $dir, $destination, $fileTmpLoc, $temp_path );
if ( $x == '1' )
{
echo "update found";
exit();
}
else if ( $x == '2' )
{
echo "Plugin already exists with same name .";
exit();
}
else if ( $x == '3' )
{
echo "Update info is not present in the update";
exit();
}
// checking for the command to install plugin is given or not
if ( !isset( $_POST['install_plugin'] ) )
{
if ( ( $_FILES["file"]["type"] == 'application/zip' ) )
{
if ( move_uploaded_file( $fileTmpLoc, $temp_path . "/" . $fileName ) ) {
echo "$fileName upload is complete.</br>" . "<button type='submit' class='btn btn-primary' style='margin-left:5px; margin-top:10px;' name='install_plugin'>Install Plugin</button></br>";
exit();
}
else
{
echo "Error in uploading file.";
exit();
}
}
else
{
echo "Please select a file with .zip extension to upload.";
exit();
}
}
else
{
// calling function to unzip archives
if ( zipExtraction( $temp_path . "/" . $fileName , $destination ) )
{
if ( file_exists( $target_path . "/.info" ) )
{
$result = readPluginFile( ".info", $target_path );
// sending all info to the database
$install_result = array();
$install_result['FileName'] = $target_path;
$install_result['Name'] = $result['PluginName'];
$install_result['Type'] = $result['Type'];
if ( Ticket_User :: isMod( unserialize( $_SESSION['ticket_user'] ) ) )
{
$install_result['Permission'] = 'admin';
}
else
{
$install_result['Permission'] = 'user';
}
$install_result['Info'] = json_encode( $result );
// connection with the database
$dbr = new DBLayer( "lib" );
$dbr -> insert( "plugins", $install_result );
// if everything is successfull redirecting to the plugin template
header( "Location: index.php?page=plugins&result=1" );
exit;
}
else
{
// file .info not exists
rmdir( $target_path );
header( "Location: index.php?page=install_plugin&result=2" );
exit;
}
} else
{
// extraction failed
header( "Location: index.php?page=install_plugin&result=0" );
exit;
}
}
}
else
{
echo "Please Browse for a file before clicking the upload button";
exit();
}
}
}
/**
* function to unzip the zipped files
*
* @param $target_path path to the target zipped file
* @param $destination path to the destination
* @return boolean
*/
function zipExtraction( $target_path, $destination )
{
$zip = new ZipArchive();
$x = $zip -> open( $target_path );
if ( $x === true ) {
if ( $zip -> extractTo( $destination ) )
{
$zip -> close();
return true;
}
else
{
$zip -> close();
return false;
}
}
}
/**
* function to read text files and extract
* the information into an array
*
* -----------------------------------------------------------
* format:
* -----------------------------------------------------------
* PluginName = Name of the plugin
* Version = version of the plugin
* Type = type of the plugin
* Description = Description of the plugin ,it's functionality
* -----------------------------------------------------------
*
* reads only files with name .info
*
* @param $fileName file to read
* @param $targetPath path to the folder containing .info file
* @return array containing above information in array(value => key)
*/
function readPluginFile( $fileName, $target_path )
{
$file_handle = fopen( $target_path . "/" . $fileName, "r" );
$result = array();
while ( !feof( $file_handle ) ) {
$line_of_text = fgets( $file_handle );
$parts = array_map( 'trim', explode( '=', $line_of_text, 2 ) );
@$result[$parts[0]] = $parts[1];
}
fclose( $file_handle );
return $result;
}
/**
* function to check for updates or
* if the same plugin already exists
* also, if the update founds ,check for the update info in the .info file.
* Update is saved in the temp direcotry with pluginName_version.zip
*
* @param $fileName file which is uploaded in .zip extension
* @param $findPath where we have to look for the installed plugins
* @param $tempFile path for the temporary file
* @param $tempPath path where we have to store the update
* @return 2 if plugin already exists and update not found
* @return 3 if update info tag not found in .info file
*/
function checkForUpdate( $fileName, $findPath, $tempFile, $tempPath )
{
// check for plugin if exists
$file = scandir( $findPath );
foreach( $file as $key => $value )
{
if ( strcmp( $value, $fileName ) == 0 )
{
if ( !file_exists( $tempPath . "/test" ) )
{
mkdir( $tempPath . "/test" );
}
// extracting the update
if ( zipExtraction( $tempFile, $tempPath . "/test/" ) )
{
$result = readPluginFile( ".info", $tempPath . "/test/" . $fileName );
// check for the version for the plugin
$db = new DBLayer( "lib" );
$sth = $db -> select( "plugins", array( 'Name' => $result['PluginName'] ), "Name = :Name" );
$info = $sth -> fetch();
$info['Info'] = json_decode( $info['Info'] );
// the two versions from main plugin and the updated part
$new_version = explode( '.', $result['Version'] );
$pre_version = explode( '.', $info['Info'] -> Version );
// For all plugins we have used semantic versioning
// Format: X.Y.Z ,X->Major, Y->Minor, Z->Patch
// change in the X Y & Z values refer the type of change in the plugin.
// for initial development only Minor an Patch MUST be 0.
// if there is bug fix then there MUST be an increment in the Z value.
// if there is change in the functionality or addition of new functionality
// then there MUST be an increment in the Y value.
// When there is increment in the X value , Y and Z MUST be 0.
// comparing if there is some change
if ( !array_diff( $new_version , $pre_version ) )
{
// removing the uploaded file
Plugincache :: rrmdir( $tempPath . "/test/" . $fileName );
return '2'; //plugin already exists
}
else
{
// check for update info if exists
if ( !array_key_exists( 'UpdateInfo', $result ) )
{
return '3'; //update info tag not found
}
else
{
// check if update already exists
if ( pluginUpdateExists( $info['Id'], $tempPath . "/" . trim( $fileName, ".zip" ) . "_" . $result['Version'] . ".zip" ) )
{
echo "Update already exists";
exit;
}
else {
// removing the preivous update
$dbr = new DBLayer( "lib" );
$dbr -> delete( "updates", array( 'id' => $info['Id'] ), "PluginId=:id" );
// storing update in the temp directory
// format of update save
if ( move_uploaded_file( $tempFile, $tempPath . "/" . trim( $fileName, ".zip" ) . "_" . $result['Version'] . ".zip" ) ) {
// setting update information in the database
$update['PluginId'] = $info['Id'];
$update['UpdatePath'] = $tempPath . "/" . trim( $fileName, ".zip" ) . "_" . $result['Version'] . ".zip";
$update['UpdateInfo'] = json_encode( $result );
$dbr -> insert( "updates", $update );
header( "Location: index.php?page=plugins&result=7" );
exit;
}
}
}
}
}
}
}
}
/**
* Function to check for the update of a plugin already exists
*
* @param $pluginId id of the plugin for which update is available
* @param $updatePath path of the new update
* @return boolean if update for a plugin already exists or
* if update of same version is uploading
*/
function PluginUpdateExists( $pluginId, $updatePath )
{
$db = new DBLayer( 'lib' );
$sth = $db -> selectWithParameter( "UpdatePath", "updates", array( 'pluginid' => $pluginId ), "PluginId=:pluginid" );
$row = $sth -> fetch();
if ( $updatePath == $row['UpdatePath'] )
{
return true;
}
else
{
rmdir( $row['UpdatePath'] );
return false;
}
}