/**
* This function is used in deleting plugins.
* It removes the plugin from the codebase as well as
* from the Database. When user request to delete a plugin
* id of that plugin is sent in $_GET global variable.
*
* @author Shubham Meena, mentored by Matthew Lagoe
*/
function delete_plugin()
{
// if logged in
if (WebUsers::isLoggedIn()) {
if (isset($_GET['id'])) {
// id of plugin to delete after filtering
$id = filter_var($_GET['id'], FILTER_SANITIZE_FULL_SPECIAL_CHARS);
$db = new DBLayer('lib');
$sth = $db->selectWithParameter("FileName", "plugins", array('id' => $id), "Id=:id");
$name = $sth->fetch();
if (is_dir("{$name['FileName']}")) {
// removing plugin directory from the code base
if (Plugincache::rrmdir("{$name['FileName']}")) {
$db->delete('plugins', array('id' => $id), "Id=:id");
//if result successfull redirect and show success message
header("Cache-Control: max-age=1");
header("Location: index.php?page=plugins&result=2");
throw new SystemExit();
} else {
// if result unsuccessfull redirect and show error message
header("Cache-Control: max-age=1");
header("Location: index.php?page=plugins&result=0");
throw new SystemExit();
}
}
} else {
// if result unsuccessfull redirect and show error message
header("Cache-Control: max-age=1");
header("Location: index.php?page=plugins&result=0");
throw new SystemExit();
}
}
}
/**
* This function is used in installing updates for plugins.
* It takes id of the plugin whose update is available using
* $_GET global variable and then extract the update details
* from db and then install it in the plugin.
*
* @author Shubham Meena, mentored by Matthew Lagoe
*/
function update_plugin()
{
// if logged in
if (WebUsers::isLoggedIn()) {
if (isset($_GET['id'])) {
// id of plugin to update
$id = filter_var($_GET['id'], FILTER_SANITIZE_FULL_SPECIAL_CHARS);
$db = new DBLayer('lib');
$sth = $db->executeWithoutParams("SELECT * FROM plugins INNER JOIN updates ON plugins.Id=updates.PluginId Where plugins.Id={$id}");
$row = $sth->fetch();
// replacing update in the database
Plugincache::rrmdir($row['FileName']);
Plugincache::zipExtraction($row['UpdatePath'], rtrim($row['FileName'], strtolower($row['Name'])));
$db->update("plugins", array('Info' => $row['UpdateInfo']), "Id={$row['Id']}");
// deleting the previous update
$db->delete("updates", array('id' => $row['s.no']), "s.no=:id");
// if update is installed succesffully redirect to show success message
header("Cache-Control: max-age=1");
header("Location: index.php?page=plugins&result=8");
throw new SystemExit();
}
}
}
/**
* function to check for updates or
* if the same plugin already exists
* also, if the update founds ,check for the UpdateInfo in the .info file.
* Update is saved in the temp directory 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";
throw new SystemExit();
} 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("Cache-Control: max-age=1");
header("Location: index.php?page=plugins&result=7");
throw new SystemExit();
}
}
}
}
}
}
}
}
/**
* function to remove a non empty directory
*
* @param $dir directory address
* @return boolean
*/
public static function rrmdir($dir)
{
$result = array_diff(scandir($dir), array('.', '..'));
foreach ($result as $item) {
if (!@unlink($dir . '/' . $item)) {
Plugincache::rrmdir($dir . '/' . $item);
}
}
return rmdir($dir);
}
