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Filename : InstallerAdapter.php
back
<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2014 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Installer;

use Joomla\CMS\Factory;
use Joomla\CMS\Filesystem\Folder;
use Joomla\CMS\Filter\InputFilter;
use Joomla\CMS\Installer\Manifest\PackageManifest;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Log\Log;
use Joomla\CMS\Table\Extension;
use Joomla\CMS\Table\Table;
use Joomla\CMS\Table\TableInterface;
use Joomla\Database\DatabaseAwareInterface;
use Joomla\Database\DatabaseAwareTrait;
use Joomla\Database\DatabaseDriver;
use Joomla\DI\Container;
use Joomla\DI\ContainerAwareInterface;
use Joomla\DI\ContainerAwareTrait;
use Joomla\DI\Exception\ContainerNotFoundException;
use Joomla\DI\ServiceProviderInterface;

/**
 * Abstract adapter for the installer.
 *
 * @since  3.4
 */
abstract class InstallerAdapter implements ContainerAwareInterface, DatabaseAwareInterface
{
    use ContainerAwareTrait;
    use DatabaseAwareTrait;

    /**
     * Changelog URL of extensions
     *
     * @var    string
     * @since  4.0.0
     * */
    protected $changelogurl = null;

    /**
     * ID for the currently installed extension if present
     *
     * @var    integer
     * @since  3.4
     */
    protected $currentExtensionId = null;

    /**
     * The unique identifier for the extension (e.g. mod_login)
     *
     * @var    string
     * @since  3.4
     * */
    protected $element = null;

    /**
     * Extension object.
     *
     * @var    Extension
     * @since  3.4
     * */
    protected $extension = null;

    /**
     * Messages rendered by custom scripts
     *
     * @var    string
     * @since  3.4
     */
    protected $extensionMessage = '';

    /**
     * Copy of the XML manifest file.
     *
     * Making this object public allows extensions to customize the manifest in custom scripts.
     *
     * @var    \SimpleXMLElement
     * @since  3.4
     */
    public $manifest = null;

    /**
     * A path to the PHP file that the scriptfile declaration in the manifest refers to.
     *
     * @var    string
     * @since  3.4
     */
    protected $manifest_script = null;

    /**
     * Name of the extension
     *
     * @var    string
     * @since  3.4
     */
    protected $name = null;

    /**
     * Installer used with this adapter
     *
     * @var    Installer
     * @since  4.0.0
     */
    protected $parent = null;

    /**
     * Install function routing
     *
     * @var    string
     * @since  3.4
     */
    protected $route = 'install';

    /**
     * Flag if the adapter supports discover installs
     *
     * Adapters should override this and set to false if discover install is unsupported
     *
     * @var    boolean
     * @since  3.4
     */
    protected $supportsDiscoverInstall = true;

    /**
     * The type of adapter in use
     *
     * @var    string
     * @since  3.4
     */
    protected $type;

    /**
     * Constructor
     *
     * @param   Installer       $parent   Parent object
     * @param   DatabaseDriver  $db       Database object
     * @param   array           $options  Configuration Options
     *
     * @since   3.4
     */
    public function __construct(Installer $parent, DatabaseDriver $db, array $options = array())
    {
        $this->parent = $parent;
        $this->setDatabase($db);

        foreach ($options as $key => $value) {
            if (property_exists($this, $key)) {
                $this->$key = $value;
            }
        }

        // Get a generic TableExtension instance for use if not already loaded
        if (!($this->extension instanceof TableInterface)) {
            $this->extension = Table::getInstance('extension');
        }

        // Sanity check, make sure the type is set by taking the adapter name from the class name
        if (!$this->type) {
            // This assumes the adapter short class name in its namespace is `<foo>Adapter`, replace this logic in subclasses if needed
            $reflection = new \ReflectionClass(\get_called_class());
            $this->type = str_replace('Adapter', '', $reflection->getShortName());
        }

        // Extension type is stored as lowercase in the database
        $this->type = strtolower($this->type);
    }

    /**
     * Check if a package extension allows its child extensions to be uninstalled individually
     *
     * @param   integer  $packageId  The extension ID of the package to check
     *
     * @return  boolean
     *
     * @since   3.7.0
     * @note    This method defaults to true to emulate the behavior of 3.6 and earlier which did not support this lookup
     */
    protected function canUninstallPackageChild($packageId)
    {
        $package = Table::getInstance('extension');

        // If we can't load this package ID, we have a corrupt database
        if (!$package->load((int) $packageId)) {
            return true;
        }

        $manifestFile = JPATH_MANIFESTS . '/packages/' . $package->element . '.xml';

        $xml = $this->parent->isManifest($manifestFile);

        // If the manifest doesn't exist, we've got some major issues
        if (!$xml) {
            return true;
        }

        $manifest = new PackageManifest($manifestFile);

        return $manifest->blockChildUninstall === false;
    }

    /**
     * Method to check if the extension is already present in the database
     *
     * @return  void
     *
     * @since   3.4
     * @throws  \RuntimeException
     */
    protected function checkExistingExtension()
    {
        try {
            $this->currentExtensionId = $this->extension->find(
                array('element' => $this->element, 'type' => $this->type)
            );

            // If it does exist, load it
            if ($this->currentExtensionId) {
                $this->extension->load(array('element' => $this->element, 'type' => $this->type));
            }
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            throw new \RuntimeException(
                Text::sprintf(
                    'JLIB_INSTALLER_ABORT_ROLLBACK',
                    Text::_('JLIB_INSTALLER_' . $this->route),
                    $e->getMessage()
                ),
                $e->getCode(),
                $e
            );
        }
    }

    /**
     * Method to check if the extension is present in the filesystem, flags the route as update if so
     *
     * @return  void
     *
     * @since   3.4
     * @throws  \RuntimeException
     */
    protected function checkExtensionInFilesystem()
    {
        if (file_exists($this->parent->getPath('extension_root')) && (!$this->parent->isOverwrite() || $this->parent->isUpgrade())) {
            // Look for an update function or update tag
            $updateElement = $this->getManifest()->update;

            // Upgrade manually set or update function available or update tag detected
            if (
                $updateElement || $this->parent->isUpgrade()
                || ($this->parent->manifestClass && method_exists($this->parent->manifestClass, 'update'))
            ) {
                // Force this one
                $this->parent->setOverwrite(true);
                $this->parent->setUpgrade(true);

                if ($this->currentExtensionId) {
                    // If there is a matching extension mark this as an update
                    $this->setRoute('update');
                }
            } elseif (!$this->parent->isOverwrite()) {
                // We didn't have overwrite set, find an update function or find an update tag so lets call it safe
                throw new \RuntimeException(
                    Text::sprintf(
                        'JLIB_INSTALLER_ABORT_DIRECTORY',
                        Text::_('JLIB_INSTALLER_' . $this->route),
                        $this->type,
                        $this->parent->getPath('extension_root')
                    )
                );
            }
        }
    }

    /**
     * Method to copy the extension's base files from the `<files>` tag(s) and the manifest file
     *
     * @return  void
     *
     * @since   3.4
     * @throws  \RuntimeException
     */
    abstract protected function copyBaseFiles();

    /**
     * Method to create the extension root path if necessary
     *
     * @return  void
     *
     * @since   3.4
     * @throws  \RuntimeException
     */
    protected function createExtensionRoot()
    {
        // If the extension directory does not exist, lets create it
        $created = false;

        if (!file_exists($this->parent->getPath('extension_root'))) {
            if (!$created = Folder::create($this->parent->getPath('extension_root'))) {
                throw new \RuntimeException(
                    Text::sprintf(
                        'JLIB_INSTALLER_ABORT_CREATE_DIRECTORY',
                        Text::_('JLIB_INSTALLER_' . $this->route),
                        $this->parent->getPath('extension_root')
                    )
                );
            }
        }

        /*
         * Since we created the extension directory and will want to remove it if
         * we have to roll back the installation, let's add it to the
         * installation step stack
         */

        if ($created) {
            $this->parent->pushStep(
                array(
                    'type' => 'folder',
                    'path' => $this->parent->getPath('extension_root'),
                )
            );
        }
    }

    /**
     * Generic discover_install method for extensions
     *
     * @return  boolean  True on success
     *
     * @since   3.4
     */
    public function discover_install()
    {
        // Get the extension's description
        $description = (string) $this->getManifest()->description;

        if ($description) {
            $this->parent->message = Text::_($description);
        } else {
            $this->parent->message = '';
        }

        // Set the extension's name and element
        $this->name    = $this->getName();
        $this->element = $this->getElement();

        /*
         * ---------------------------------------------------------------------------------------------
         * Extension Precheck and Setup Section
         * ---------------------------------------------------------------------------------------------
         */

        // Setup the install paths and perform other prechecks as necessary
        try {
            $this->setupInstallPaths();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        /*
         * ---------------------------------------------------------------------------------------------
         * Installer Trigger Loading
         * ---------------------------------------------------------------------------------------------
         */

        $this->setupScriptfile();

        try {
            $this->triggerManifestScript('preflight');
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        /*
         * ---------------------------------------------------------------------------------------------
         * Database Processing Section
         * ---------------------------------------------------------------------------------------------
         */

        try {
            $this->storeExtension();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        try {
            $this->parseQueries();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        // Run the custom install method
        try {
            $this->triggerManifestScript('install');
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        /*
         * ---------------------------------------------------------------------------------------------
         * Finalization and Cleanup Section
         * ---------------------------------------------------------------------------------------------
         */

        try {
            $this->finaliseInstall();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        // And now we run the postflight
        try {
            $this->triggerManifestScript('postflight');
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        return $this->extension->extension_id;
    }

    /**
     * Method to handle database transactions for the installer
     *
     * @return  boolean  True on success
     *
     * @since   3.4
     * @throws  \RuntimeException
     */
    protected function doDatabaseTransactions()
    {
        $route = $this->route === 'discover_install' ? 'install' : $this->route;

        // Let's run the install queries for the component
        if (isset($this->getManifest()->{$route}->sql)) {
            $result = $this->parent->parseSQLFiles($this->getManifest()->{$route}->sql);

            if ($result === false) {
                // Only rollback if installing
                if ($route === 'install') {
                    throw new \RuntimeException(Text::_('JLIB_INSTALLER_ABORT_INSTALL_ABORTED'));
                }

                return false;
            }

            // If installing with success and there is an uninstall script, add an installer rollback step to rollback if needed
            if ($route === 'install' && isset($this->getManifest()->uninstall->sql)) {
                $this->parent->pushStep(array('type' => 'query', 'script' => $this->getManifest()->uninstall->sql));
            }
        }

        return true;
    }

    /**
     * Load language files
     *
     * @param   string  $extension  The name of the extension
     * @param   string  $source     Path to the extension
     * @param   string  $base       Base path for the extension language
     *
     * @return  void
     *
     * @since   3.4
     */
    protected function doLoadLanguage($extension, $source, $base = JPATH_ADMINISTRATOR)
    {
        $lang = Factory::getLanguage();
        $lang->load($extension . '.sys', $source) || $lang->load($extension . '.sys', $base);
    }

    /**
     * Method to finalise the installation processing
     *
     * @return  void
     *
     * @since   4.0.0
     * @throws  \RuntimeException
     */
    abstract protected function finaliseInstall();

    /**
     * Method to finalise the uninstallation processing
     *
     * @return  boolean
     *
     * @since   4.0.0
     * @throws  \RuntimeException
     */
    abstract protected function finaliseUninstall(): bool;

    /**
     * Checks if the adapter supports discover_install
     *
     * @return  boolean
     *
     * @since   3.4
     */
    public function getDiscoverInstallSupported()
    {
        return $this->supportsDiscoverInstall;
    }

    /**
     * Get the filtered extension element from the manifest
     *
     * @param   string  $element  Optional element name to be converted
     *
     * @return  string  The filtered element
     *
     * @since   3.4
     */
    public function getElement($element = null)
    {
        if (!$element) {
            // Ensure the element is a string
            $element = (string) $this->getManifest()->element;
        }

        if (!$element) {
            $element = $this->getName();
        }

        // Filter the name for illegal characters
        return strtolower(InputFilter::getInstance()->clean($element, 'cmd'));
    }

    /**
     * Get the manifest object.
     *
     * @return  \SimpleXMLElement  Manifest object
     *
     * @since   3.4
     */
    public function getManifest()
    {
        return $this->manifest;
    }

    /**
     * Get the filtered component name from the manifest
     *
     * @return  string  The filtered name
     *
     * @since   3.4
     */
    public function getName()
    {
        // Ensure the name is a string
        $name = (string) $this->getManifest()->name;

        // Filter the name for illegal characters
        $name = InputFilter::getInstance()->clean($name, 'string');

        return $name;
    }

    /**
     * Retrieves the parent installer
     *
     * @return  Installer
     *
     * @since   4.0.0
     */
    public function getParent()
    {
        return $this->parent;
    }

    /**
     * Get the install route being followed
     *
     * @return  string  The install route
     *
     * @since   3.4
     */
    public function getRoute()
    {
        return $this->route;
    }

    /**
     * Get the class name for the install adapter script.
     *
     * @return  string  The class name.
     *
     * @since   3.4
     */
    protected function getScriptClassName()
    {
        // Support element names like 'en-GB'
        $className = InputFilter::getInstance()->clean($this->element, 'cmd') . 'InstallerScript';

        // Cannot have - in class names
        $className = str_replace('-', '', $className);

        return $className;
    }

    /**
     * Generic install method for extensions
     *
     * @return  boolean|integer  The extension ID on success, boolean false on failure
     *
     * @since   3.4
     */
    public function install()
    {
        // Get the extension's description
        $description           = (string) $this->getManifest()->description;
        $this->parent->message = '';

        if ($description) {
            $this->parent->message = Text::_($description);
        }

        // Set the extension's name and element
        $this->name         = $this->getName();
        $this->element      = $this->getElement();
        $this->changelogurl = (string) $this->getManifest()->changelogurl;

        /*
         * ---------------------------------------------------------------------------------------------
         * Extension Precheck and Setup Section
         * ---------------------------------------------------------------------------------------------
         */

        // Setup the install paths and perform other prechecks as necessary
        try {
            $this->setupInstallPaths();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        // Check to see if an extension by the same name is already installed.
        try {
            $this->checkExistingExtension();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        // Check if the extension is present in the filesystem
        try {
            $this->checkExtensionInFilesystem();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        // If we are on the update route, run any custom setup routines
        if ($this->route === 'update') {
            try {
                $this->setupUpdates();
            } catch (\RuntimeException $e) {
                // Install failed, roll back changes
                $this->parent->abort($e->getMessage());

                return false;
            }
        }

        /*
         * ---------------------------------------------------------------------------------------------
         * Installer Trigger Loading
         * ---------------------------------------------------------------------------------------------
         */

        $this->setupScriptfile();

        try {
            $this->triggerManifestScript('preflight');
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        /*
         * ---------------------------------------------------------------------------------------------
         * Filesystem Processing Section
         * ---------------------------------------------------------------------------------------------
         */

        // If the extension directory does not exist, lets create it
        try {
            $this->createExtensionRoot();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        // Copy all necessary files
        try {
            $this->copyBaseFiles();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        // Parse optional tags
        $this->parseOptionalTags();

        /*
         * ---------------------------------------------------------------------------------------------
         * Database Processing Section
         * ---------------------------------------------------------------------------------------------
         */

        try {
            $this->storeExtension();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        try {
            $this->parseQueries();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        // Run the custom method based on the route
        try {
            $this->triggerManifestScript($this->route);
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        /*
         * ---------------------------------------------------------------------------------------------
         * Finalization and Cleanup Section
         * ---------------------------------------------------------------------------------------------
         */

        try {
            $this->finaliseInstall();
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        // And now we run the postflight
        try {
            $this->triggerManifestScript('postflight');
        } catch (\RuntimeException $e) {
            // Install failed, roll back changes
            $this->parent->abort($e->getMessage());

            return false;
        }

        return $this->extension->extension_id;
    }

    /**
     * Method to parse the queries specified in the `<sql>` tags
     *
     * @return  void
     *
     * @since   3.4
     * @throws  \RuntimeException
     */
    protected function parseQueries()
    {
        // Let's run the queries for the extension
        if (\in_array($this->route, array('install', 'discover_install', 'uninstall'))) {
            // This method may throw an exception, but it is caught by the parent caller
            if (!$this->doDatabaseTransactions()) {
                throw new \RuntimeException(Text::_('JLIB_INSTALLER_ABORT_INSTALL_ABORTED'));
            }

            // Set the schema version to be the latest update version
            if ($this->getManifest()->update) {
                $this->parent->setSchemaVersion($this->getManifest()->update->schemas, $this->extension->extension_id);
            }
        } elseif ($this->route === 'update') {
            if ($this->getManifest()->update) {
                $result = $this->parent->parseSchemaUpdates($this->getManifest()->update->schemas, $this->extension->extension_id);

                if ($result === false) {
                    // Install failed, rollback changes
                    throw new \RuntimeException(Text::_('JLIB_INSTALLER_ABORT_INSTALL_ABORTED'));
                }
            }
        }
    }

    /**
     * Method to parse optional tags in the manifest
     *
     * @return  void
     *
     * @since   3.1
     */
    protected function parseOptionalTags()
    {
        // Some extensions may not have optional tags
    }

    /**
     * Prepares the adapter for a discover_install task
     *
     * @return  void
     *
     * @since   3.4
     */
    public function prepareDiscoverInstall()
    {
        // Adapters may not support discover install or may have overridden the default task and aren't using this
    }

    /**
     * Removes this extension's files
     *
     * @return  void
     *
     * @since   4.0.0
     * @throws  \RuntimeException
     */
    abstract protected function removeExtensionFiles();

    /**
     * Set the manifest object.
     *
     * @param   object  $manifest  The manifest object
     *
     * @return  InstallerAdapter  Instance of this class to support chaining
     *
     * @since   3.4
     */
    public function setManifest($manifest)
    {
        $this->manifest = $manifest;

        return $this;
    }

    /**
     * Set the install route being followed
     *
     * @param   string  $route  The install route being followed
     *
     * @return  InstallerAdapter  Instance of this class to support chaining
     *
     * @since   3.4
     */
    public function setRoute($route)
    {
        $this->route = $route;

        return $this;
    }

    /**
     * Method to do any prechecks and setup the install paths for the extension
     *
     * @return  void
     *
     * @since   3.4
     */
    abstract protected function setupInstallPaths();

    /**
     * Setup the manifest script file for those adapters that use it.
     *
     * @return  void
     *
     * @since   3.4
     */
    protected function setupScriptfile()
    {
        // If there is a manifest class file, lets load it; we'll copy it later (don't have dest yet)
        $manifestScript = (string) $this->getManifest()->scriptfile;

        // When no script file, do nothing
        if (!$manifestScript) {
            return;
        }

        // Build a child container, so we do not overwrite the global one
        // and start from scratch when multiple extensions are installed
        try {
            $container = new Container($this->getContainer());
        } catch (ContainerNotFoundException $e) {
            @trigger_error('Container must be set.', E_USER_DEPRECATED);

            // Fallback to the global container
            $container = new Container(Factory::getContainer());
        }

        // The real location of the file
        $manifestScriptFile = $this->parent->getPath('source') . '/' . $manifestScript;

        $installer = null;

        // Load the installer from the file
        if (!file_exists($manifestScriptFile)) {
            @trigger_error(
                'Installer file must exist when defined. In version 5.0 this will crash.',
                E_USER_DEPRECATED
            );

            return;
        }

        require_once $manifestScriptFile;

        // When the instance is a service provider, then register the container with it
        if ($installer instanceof ServiceProviderInterface) {
            $installer->register($container);
        }

        // When the returned object is an installer instance, use it directly
        if ($installer instanceof InstallerScriptInterface) {
            $container->set(InstallerScriptInterface::class, $installer);
        }

        // When none is set, then use the legacy way
        if (!$container->has(InstallerScriptInterface::class)) {
            @trigger_error(
                'Legacy installer files are deprecated and will be removed in 6.0. Use a service provider instead.',
                E_USER_DEPRECATED
            );

            $classname = $this->getScriptClassName();

            \JLoader::register($classname, $manifestScriptFile);

            if (!class_exists($classname)) {
                return;
            }

            $container->set(
                InstallerScriptInterface::class,
                function (Container $container) use ($classname) {
                    return new LegacyInstallerScript(new $classname($this));
                }
            );
        }

        // Create a new instance
        $this->parent->manifestClass = $container->get(InstallerScriptInterface::class);

        // And set this so we can copy it later
        $this->manifest_script = $manifestScript;
    }

    /**
     * Method to do any prechecks and setup the uninstall job
     *
     * @return  void
     *
     * @since   4.0.0
     */
    abstract protected function setupUninstall();

    /**
     * Method to setup the update routine for the adapter
     *
     * @return  void
     *
     * @since   3.4
     */
    protected function setupUpdates()
    {
        // Some extensions may not have custom setup routines for updates
    }

    /**
     * Method to store the extension to the database
     *
     * @return  void
     *
     * @since   3.4
     * @throws  \RuntimeException
     */
    abstract protected function storeExtension();

    /**
     * Executes a custom install script method
     *
     * @param   string  $method  The install method to execute
     *
     * @return  boolean  True on success
     *
     * @since   3.4
     * @throws  \RuntimeException
     */
    protected function triggerManifestScript($method)
    {
        ob_start();
        ob_implicit_flush(false);

        if ($this->parent->manifestClass && method_exists($this->parent->manifestClass, $method)) {
            switch ($method) {
                // The preflight and postflight take the route as a param
                case 'preflight':
                case 'postflight':
                    if ($this->parent->manifestClass->$method($this->route, $this) === false) {
                        if ($method !== 'postflight') {
                            // Clean and close the output buffer
                            ob_end_clean();

                            // The script failed, rollback changes
                            throw new \RuntimeException(
                                Text::sprintf(
                                    'JLIB_INSTALLER_ABORT_INSTALL_CUSTOM_INSTALL_FAILURE',
                                    Text::_('JLIB_INSTALLER_' . $this->route)
                                )
                            );
                        }
                    }
                    break;

                // The install, uninstall, and update methods only pass this object as a param
                case 'install':
                case 'uninstall':
                case 'update':
                    if ($this->parent->manifestClass->$method($this) === false) {
                        if ($method !== 'uninstall') {
                            // Clean and close the output buffer
                            ob_end_clean();

                            // The script failed, rollback changes
                            throw new \RuntimeException(
                                Text::sprintf(
                                    'JLIB_INSTALLER_ABORT_INSTALL_CUSTOM_INSTALL_FAILURE',
                                    Text::_('JLIB_INSTALLER_' . $this->route)
                                )
                            );
                        }
                    }
                    break;
            }
        }

        // Append to the message object
        $this->extensionMessage .= ob_get_clean();

        // If in postflight or uninstall, set the message for display
        if (($method === 'uninstall' || $method === 'postflight') && $this->extensionMessage !== '') {
            $this->parent->set('extension_message', $this->extensionMessage);
        }

        return true;
    }

    /**
     * Generic update method for extensions
     *
     * @param   integer  $id  The extension ID
     *
     * @return  boolean  True on success
     *
     * @since   4.0.0
     */
    public function uninstall($id)
    {
        if (!$this->extension->load((int) $id)) {
            Log::add(Text::_('JLIB_INSTALLER_ERROR_UNKNOWN_EXTENSION'), Log::WARNING, 'jerror');

            return false;
        }

        // Joomla 4: Locked extensions cannot be removed.
        if (isset($this->extension->locked) && $this->extension->locked) {
            Log::add(Text::_('JLIB_INSTALLER_ERROR_UNINSTALL_LOCKED_EXTENSION'), Log::WARNING, 'jerror');

            return false;
        } elseif (!isset($this->extension->locked) && $this->extension->protected) {
            // Joomla 3 ('locked' property does not exist yet): Protected extensions cannot be removed.
            Log::add(Text::_('JLIB_INSTALLER_ERROR_UNINSTALL_PROTECTED_EXTENSION'), Log::WARNING, 'jerror');

            return false;
        }

        /*
         * Does this extension have a parent package?
         * If so, check if the package disallows individual extensions being uninstalled if the package is not being uninstalled
         */
        if ($this->extension->package_id && !$this->parent->isPackageUninstall() && !$this->canUninstallPackageChild($this->extension->package_id)) {
            Log::add(
                Text::sprintf('JLIB_INSTALLER_ERROR_CANNOT_UNINSTALL_CHILD_OF_PACKAGE', $this->extension->name),
                Log::WARNING,
                'jerror'
            );

            return false;
        }

        // Setup the uninstall job as required
        try {
            $this->setupUninstall();
        } catch (\RuntimeException $e) {
            Log::add($e->getMessage(), Log::WARNING, 'jerror');

            return false;
        }

        // Set the extension's name and element
        $this->name    = $this->getName();
        $this->element = $this->getElement();

        /*
         * ---------------------------------------------------------------------------------------------
         * Installer Trigger Loading and Uninstall
         * ---------------------------------------------------------------------------------------------
         */

        $this->setupScriptfile();

        try {
            $this->triggerManifestScript('preflight');
        } catch (\RuntimeException $e) {
            Log::add($e->getMessage(), Log::WARNING, 'jerror');

            return false;
        }

        try {
            $this->triggerManifestScript('uninstall');
        } catch (\RuntimeException $e) {
            // Ignore errors for now
        }

        // Tasks from here may fail but we will still attempt to finish the uninstall process
        $retval = true;

        /*
         * ---------------------------------------------------------------------------------------------
         * Database Processing Section
         * ---------------------------------------------------------------------------------------------
         */

        try {
            $this->parseQueries();
        } catch (\RuntimeException $e) {
            Log::add($e->getMessage(), Log::WARNING, 'jerror');

            $retval = false;
        }

        /*
         * ---------------------------------------------------------------------------------------------
         * Filesystem Processing Section
         * ---------------------------------------------------------------------------------------------
         */

        try {
            $this->removeExtensionFiles();
        } catch (\RuntimeException $e) {
            Log::add($e->getMessage(), Log::WARNING, 'jerror');

            $retval = false;
        }

        /*
         * ---------------------------------------------------------------------------------------------
         * Finalization and Cleanup Section
         * ---------------------------------------------------------------------------------------------
         */

        try {
            $retval |= $this->finaliseUninstall();
        } catch (\RuntimeException $e) {
            Log::add($e->getMessage(), Log::WARNING, 'jerror');

            $retval = false;
        }

        // And now we run the postflight
        try {
            $this->triggerManifestScript('postflight');
        } catch (\RuntimeException $e) {
            Log::add($e->getMessage(), Log::WARNING, 'jerror');

            $retval = false;
        }

        return $retval;
    }

    /**
     * Generic update method for extensions
     *
     * @return  boolean|integer  The extension ID on success, boolean false on failure
     *
     * @since   3.4
     */
    public function update()
    {
        // Set the overwrite setting
        $this->parent->setOverwrite(true);
        $this->parent->setUpgrade(true);

        // And make sure the route is set correctly
        $this->setRoute('update');

        // Now jump into the install method to run the update
        return $this->install();
    }

    /**
     * Proxy for db variable.
     *
     * @param   string  $name  The name of the element
     *
     * @return  mixed  The value of the element if set, null otherwise
     *
     * @since   4.2.0
     *
     * @deprecated  5.0 Use getDatabase() instead of directly accessing db
     */
    public function __get($name)
    {
        if ($name === 'db') {
            return $this->getDatabase();
        }

        // Default the variable
        if (!isset($this->$name)) {
            $this->$name = null;
        }

        return $this->$name;
    }
}