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<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer\Console;

use Composer\IO\NullIO;
use Composer\Util\Filesystem;
use Composer\Util\Platform;
use Composer\Util\Silencer;
use Symfony\Component\Console\Application as BaseApplication;
use Symfony\Component\Console\Exception\CommandNotFoundException;
use Symfony\Component\Console\Helper\HelperSet;
use Symfony\Component\Console\Helper\QuestionHelper;
use Symfony\Component\Console\Input\InputDefinition;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use Seld\JsonLint\ParsingException;
use Composer\Command;
use Composer\Composer;
use Composer\Factory;
use Composer\IO\IOInterface;
use Composer\IO\ConsoleIO;
use Composer\Json\JsonValidationException;
use Composer\Util\ErrorHandler;
use Composer\Util\HttpDownloader;
use Composer\EventDispatcher\ScriptExecutionException;
use Composer\Exception\NoSslException;
use Composer\XdebugHandler\XdebugHandler;
use Symfony\Component\Process\Exception\ProcessTimedOutException;

/**
 * The console application that handles the commands
 *
 * @author Ryan Weaver <ryan@knplabs.com>
 * @author Jordi Boggiano <j.boggiano@seld.be>
 * @author François Pluchino <francois.pluchino@opendisplay.com>
 */
class Application extends BaseApplication
{
    /**
     * @var ?Composer
     */
    protected $composer;

    /**
     * @var IOInterface
     */
    protected $io;

    /** @var string */
    private static $logo = '   ______
  / ____/___  ____ ___  ____  ____  ________  _____
 / /   / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ (__  )  __/ /
\____/\____/_/ /_/ /_/ .___/\____/____/\___/_/
                    /_/
';

    /** @var bool */
    private $hasPluginCommands = false;
    /** @var bool */
    private $disablePluginsByDefault = false;
    /** @var bool */
    private $disableScriptsByDefault = false;

    /**
     * @var string Store the initial working directory at startup time
     */
    private $initialWorkingDirectory;

    public function __construct()
    {
        static $shutdownRegistered = false;

        if (function_exists('ini_set') && extension_loaded('xdebug')) {
            ini_set('xdebug.show_exception_trace', '0');
            ini_set('xdebug.scream', '0');
        }

        if (function_exists('date_default_timezone_set') && function_exists('date_default_timezone_get')) {
            date_default_timezone_set(Silencer::call('date_default_timezone_get'));
        }

        if (!$shutdownRegistered) {
            if (function_exists('pcntl_async_signals') && function_exists('pcntl_signal')) {
                pcntl_async_signals(true);
                pcntl_signal(SIGINT, function ($sig) {
                    exit(130);
                });
            }

            $shutdownRegistered = true;

            register_shutdown_function(function () {
                $lastError = error_get_last();

                if ($lastError && $lastError['message'] &&
                   (strpos($lastError['message'], 'Allowed memory') !== false /*Zend PHP out of memory error*/ ||
                    strpos($lastError['message'], 'exceeded memory') !== false /*HHVM out of memory errors*/)) {
                    echo "\n". 'Check https://getcomposer.org/doc/articles/troubleshooting.md#memory-limit-errors for more info on how to handle out of memory errors.';
                }
            });
        }

        $this->io = new NullIO();

        $this->initialWorkingDirectory = getcwd();

        parent::__construct('Composer', Composer::getVersion());
    }

    /**
     * @return int
     */
    public function run(InputInterface $input = null, OutputInterface $output = null)
    {
        if (null === $output) {
            $output = Factory::createOutput();
        }

        return parent::run($input, $output);
    }

    /**
     * @return int
     */
    public function doRun(InputInterface $input, OutputInterface $output)
    {
        $this->disablePluginsByDefault = $input->hasParameterOption('--no-plugins');
        $this->disableScriptsByDefault = $input->hasParameterOption('--no-scripts');

        if (Platform::getEnv('COMPOSER_NO_INTERACTION') || !Platform::isTty(defined('STDIN') ? STDIN : fopen('php://stdin', 'r'))) {
            $input->setInteractive(false);
        }

        $io = $this->io = new ConsoleIO($input, $output, new HelperSet(array(
            new QuestionHelper(),
        )));

        // Register error handler again to pass it the IO instance
        ErrorHandler::register($io);

        if ($input->hasParameterOption('--no-cache')) {
            $io->writeError('Disabling cache usage', true, IOInterface::DEBUG);
            Platform::putEnv('COMPOSER_CACHE_DIR', Platform::isWindows() ? 'nul' : '/dev/null');
        }

        // switch working dir
        if ($newWorkDir = $this->getNewWorkingDir($input)) {
            $oldWorkingDir = getcwd();
            chdir($newWorkDir);
            $this->initialWorkingDirectory = $newWorkDir;
            $io->writeError('Changed CWD to ' . getcwd(), true, IOInterface::DEBUG);
        }

        // determine command name to be executed without including plugin commands
        $commandName = '';
        if ($name = $this->getCommandName($input)) {
            try {
                $commandName = $this->find($name)->getName();
            } catch (CommandNotFoundException $e) {
                // we'll check command validity again later after plugins are loaded
                $commandName = false;
            } catch (\InvalidArgumentException $e) {
            }
        }

        // prompt user for dir change if no composer.json is present in current dir
        if ($io->isInteractive() && !$newWorkDir && !in_array($commandName, array('', 'list', 'init', 'about', 'help', 'diagnose', 'self-update', 'global', 'create-project', 'outdated'), true) && !file_exists(Factory::getComposerFile()) && ($useParentDirIfNoJsonAvailable = $this->getUseParentDirConfigValue()) !== false) {
            $dir = dirname(getcwd());
            $home = realpath(Platform::getEnv('HOME') ?: Platform::getEnv('USERPROFILE') ?: '/');

            // abort when we reach the home dir or top of the filesystem
            while (dirname($dir) !== $dir && $dir !== $home) {
                if (file_exists($dir.'/'.Factory::getComposerFile())) {
                    if ($useParentDirIfNoJsonAvailable === true || $io->askConfirmation('<info>No composer.json in current directory, do you want to use the one at '.$dir.'?</info> [<comment>Y,n</comment>]? ')) {
                        if ($useParentDirIfNoJsonAvailable === true) {
                            $io->writeError('<info>No composer.json in current directory, changing working directory to '.$dir.'</info>');
                        } else {
                            $io->writeError('<info>Always want to use the parent dir? Use "composer config --global use-parent-dir true" to change the default.</info>');
                        }
                        $oldWorkingDir = getcwd();
                        chdir($dir);
                    }
                    break;
                }
                $dir = dirname($dir);
            }
        }

        // avoid loading plugins/initializing the Composer instance earlier than necessary if no plugin command is needed
        // if showing the version, we never need plugin commands
        $mayNeedPluginCommand = false === $input->hasParameterOption(array('--version', '-V'))
            && (
                // not a composer command, so try loading plugin ones
                false === $commandName
                // list command requires plugin commands to show them
                || in_array($commandName, array('', 'list', 'help'), true)
            );

        if ($mayNeedPluginCommand && !$this->disablePluginsByDefault && !$this->hasPluginCommands) {
            try {
                foreach ($this->getPluginCommands() as $command) {
                    if ($this->has($command->getName())) {
                        $io->writeError('<warning>Plugin command '.$command->getName().' ('.get_class($command).') would override a Composer command and has been skipped</warning>');
                    } else {
                        $this->add($command);
                    }
                }
            } catch (NoSslException $e) {
                // suppress these as they are not relevant at this point
            } catch (ParsingException $e) {
                $details = $e->getDetails();

                $file = realpath(Factory::getComposerFile());

                $line = null;
                if ($details && isset($details['line'])) {
                    $line = $details['line'];
                }

                $ghe = new GithubActionError($this->io);
                $ghe->emit($e->getMessage(), $file, $line);

                throw $e;
            }

            $this->hasPluginCommands = true;
        }

        // determine command name to be executed incl plugin commands, and check if it's a proxy command
        $isProxyCommand = false;
        if ($name = $this->getCommandName($input)) {
            try {
                $command = $this->find($name);
                $commandName = $command->getName();
                $isProxyCommand = ($command instanceof Command\BaseCommand && $command->isProxyCommand());
            } catch (\InvalidArgumentException $e) {
            }
        }

        if (!$isProxyCommand) {
            $io->writeError(sprintf(
                'Running %s (%s) with %s on %s',
                Composer::getVersion(),
                Composer::RELEASE_DATE,
                defined('HHVM_VERSION') ? 'HHVM '.HHVM_VERSION : 'PHP '.PHP_VERSION,
                function_exists('php_uname') ? php_uname('s') . ' / ' . php_uname('r') : 'Unknown OS'
            ), true, IOInterface::DEBUG);

            if (PHP_VERSION_ID < 50302) {
                $io->writeError('<warning>Composer only officially supports PHP 5.3.2 and above, you will most likely encounter problems with your PHP '.PHP_VERSION.', upgrading is strongly recommended.</warning>');
            }

            if (XdebugHandler::isXdebugActive() && !Platform::getEnv('COMPOSER_DISABLE_XDEBUG_WARN')) {
                $io->writeError('<warning>Composer is operating slower than normal because you have Xdebug enabled. See https://getcomposer.org/xdebug</warning>');
            }

            if (defined('COMPOSER_DEV_WARNING_TIME') && $commandName !== 'self-update' && $commandName !== 'selfupdate' && time() > COMPOSER_DEV_WARNING_TIME) {
                $io->writeError(sprintf('<warning>Warning: This development build of Composer is over 60 days old. It is recommended to update it by running "%s self-update" to get the latest version.</warning>', $_SERVER['PHP_SELF']));
            }

            if (
                !Platform::isWindows()
                && function_exists('exec')
                && !Platform::getEnv('COMPOSER_ALLOW_SUPERUSER')
                && (ini_get('open_basedir') || !file_exists('/.dockerenv'))
            ) {
                if (function_exists('posix_getuid') && posix_getuid() === 0) {
                    if ($commandName !== 'self-update' && $commandName !== 'selfupdate') {
                        $io->writeError('<warning>Do not run Composer as root/super user! See https://getcomposer.org/root for details</warning>');

                        if ($io->isInteractive()) {
                            if (!$io->askConfirmation('<info>Continue as root/super user</info> [<comment>yes</comment>]? ')) {
                                return 1;
                            }
                        }
                    }
                    if ($uid = (int) Platform::getEnv('SUDO_UID')) {
                        // Silently clobber any sudo credentials on the invoking user to avoid privilege escalations later on
                        // ref. https://github.com/composer/composer/issues/5119
                        Silencer::call('exec', "sudo -u \\#{$uid} sudo -K > /dev/null 2>&1");
                    }
                }
                // Silently clobber any remaining sudo leases on the current user as well to avoid privilege escalations
                Silencer::call('exec', 'sudo -K > /dev/null 2>&1');
            }

            // Check system temp folder for usability as it can cause weird runtime issues otherwise
            Silencer::call(function () use ($io) {
                $tempfile = sys_get_temp_dir() . '/temp-' . md5(microtime());
                if (!(file_put_contents($tempfile, __FILE__) && (file_get_contents($tempfile) == __FILE__) && unlink($tempfile) && !file_exists($tempfile))) {
                    $io->writeError(sprintf('<error>PHP temp directory (%s) does not exist or is not writable to Composer. Set sys_temp_dir in your php.ini</error>', sys_get_temp_dir()));
                }
            });

            // add non-standard scripts as own commands
            $file = Factory::getComposerFile();
            if (is_file($file) && Filesystem::isReadable($file) && is_array($composer = json_decode(file_get_contents($file), true))) {
                if (isset($composer['scripts']) && is_array($composer['scripts'])) {
                    foreach ($composer['scripts'] as $script => $dummy) {
                        if (!defined('Composer\Script\ScriptEvents::'.str_replace('-', '_', strtoupper($script)))) {
                            if ($this->has($script)) {
                                $io->writeError('<warning>A script named '.$script.' would override a Composer command and has been skipped</warning>');
                            } else {
                                $description = null;

                                if (isset($composer['scripts-descriptions'][$script])) {
                                    $description = $composer['scripts-descriptions'][$script];
                                }

                                $this->add(new Command\ScriptAliasCommand($script, $description));
                            }
                        }
                    }
                }
            }
        }

        try {
            if ($input->hasParameterOption('--profile')) {
                $startTime = microtime(true);
                $this->io->enableDebugging($startTime);
            }

            $result = parent::doRun($input, $output);

            // chdir back to $oldWorkingDir if set
            if (isset($oldWorkingDir)) {
                Silencer::call('chdir', $oldWorkingDir);
            }

            if (isset($startTime)) {
                $io->writeError('<info>Memory usage: '.round(memory_get_usage() / 1024 / 1024, 2).'MiB (peak: '.round(memory_get_peak_usage() / 1024 / 1024, 2).'MiB), time: '.round(microtime(true) - $startTime, 2).'s');
            }

            restore_error_handler();

            return $result;
        } catch (ScriptExecutionException $e) {
            return $e->getCode();
        } catch (\Exception $e) {
            $ghe = new GithubActionError($this->io);
            $ghe->emit($e->getMessage());

            $this->hintCommonErrors($e);

            restore_error_handler();

            throw $e;
        }
    }

    /**
     * @param  InputInterface    $input
     * @throws \RuntimeException
     * @return string
     */
    private function getNewWorkingDir(InputInterface $input)
    {
        $workingDir = $input->getParameterOption(array('--working-dir', '-d'));
        if (false !== $workingDir && !is_dir($workingDir)) {
            throw new \RuntimeException('Invalid working directory specified, '.$workingDir.' does not exist.');
        }

        return $workingDir;
    }

    /**
     * @return void
     */
    private function hintCommonErrors(\Exception $exception)
    {
        $io = $this->getIO();

        Silencer::suppress();
        try {
            $composer = $this->getComposer(false, true);
            if (null !== $composer && function_exists('disk_free_space')) {
                $config = $composer->getConfig();

                $minSpaceFree = 1024 * 1024;
                if ((($df = disk_free_space($dir = $config->get('home'))) !== false && $df < $minSpaceFree)
                    || (($df = disk_free_space($dir = $config->get('vendor-dir'))) !== false && $df < $minSpaceFree)
                    || (($df = disk_free_space($dir = sys_get_temp_dir())) !== false && $df < $minSpaceFree)
                ) {
                    $io->writeError('<error>The disk hosting '.$dir.' is full, this may be the cause of the following exception</error>', true, IOInterface::QUIET);
                }
            }
        } catch (\Exception $e) {
        }
        Silencer::restore();

        if (Platform::isWindows() && false !== strpos($exception->getMessage(), 'The system cannot find the path specified')) {
            $io->writeError('<error>The following exception may be caused by a stale entry in your cmd.exe AutoRun</error>', true, IOInterface::QUIET);
            $io->writeError('<error>Check https://getcomposer.org/doc/articles/troubleshooting.md#-the-system-cannot-find-the-path-specified-windows- for details</error>', true, IOInterface::QUIET);
        }

        if (false !== strpos($exception->getMessage(), 'fork failed - Cannot allocate memory')) {
            $io->writeError('<error>The following exception is caused by a lack of memory or swap, or not having swap configured</error>', true, IOInterface::QUIET);
            $io->writeError('<error>Check https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for details</error>', true, IOInterface::QUIET);
        }

        if ($exception instanceof ProcessTimedOutException) {
            $io->writeError('<error>The following exception is caused by a process timeout</error>', true, IOInterface::QUIET);
            $io->writeError('<error>Check https://getcomposer.org/doc/06-config.md#process-timeout for details</error>', true, IOInterface::QUIET);
        }

        if ($hints = HttpDownloader::getExceptionHints($exception)) {
            foreach ($hints as $hint) {
                $io->writeError($hint, true, IOInterface::QUIET);
            }
        }
    }

    /**
     * @param  bool                    $required
     * @param  bool|null               $disablePlugins
     * @param  bool|null               $disableScripts
     * @throws JsonValidationException
     * @throws \InvalidArgumentException
     * @return ?\Composer\Composer If $required is true then the return value is guaranteed
     */
    public function getComposer($required = true, $disablePlugins = null, $disableScripts = null)
    {
        if (null === $disablePlugins) {
            $disablePlugins = $this->disablePluginsByDefault;
        }
        if (null === $disableScripts) {
            $disableScripts = $this->disableScriptsByDefault;
        }

        if (null === $this->composer) {
            try {
                $this->composer = Factory::create($this->io, null, $disablePlugins, $disableScripts);
            } catch (\InvalidArgumentException $e) {
                if ($required) {
                    $this->io->writeError($e->getMessage());
                    // TODO composer 2.3 simplify to $this->areExceptionsCaught()
                    if (!method_exists($this, 'areExceptionsCaught') || $this->areExceptionsCaught()) {
                        exit(1);
                    }
                    throw $e;
                }
            } catch (JsonValidationException $e) {
                if ($required) {
                    throw $e;
                }
            }
        }

        return $this->composer;
    }

    /**
     * Removes the cached composer instance
     *
     * @return void
     */
    public function resetComposer()
    {
        $this->composer = null;
        if (method_exists($this->getIO(), 'resetAuthentications')) {
            $this->getIO()->resetAuthentications();
        }
    }

    /**
     * @return IOInterface
     */
    public function getIO()
    {
        return $this->io;
    }

    /**
     * @return string
     */
    public function getHelp()
    {
        return self::$logo . parent::getHelp();
    }

    /**
     * Initializes all the composer commands.
     * @return \Symfony\Component\Console\Command\Command[]
     */
    protected function getDefaultCommands()
    {
        $commands = array_merge(parent::getDefaultCommands(), array(
            new Command\AboutCommand(),
            new Command\ConfigCommand(),
            new Command\DependsCommand(),
            new Command\ProhibitsCommand(),
            new Command\InitCommand(),
            new Command\InstallCommand(),
            new Command\CreateProjectCommand(),
            new Command\UpdateCommand(),
            new Command\SearchCommand(),
            new Command\ValidateCommand(),
            new Command\ShowCommand(),
            new Command\SuggestsCommand(),
            new Command\RequireCommand(),
            new Command\DumpAutoloadCommand(),
            new Command\StatusCommand(),
            new Command\ArchiveCommand(),
            new Command\DiagnoseCommand(),
            new Command\RunScriptCommand(),
            new Command\LicensesCommand(),
            new Command\GlobalCommand(),
            new Command\ClearCacheCommand(),
            new Command\RemoveCommand(),
            new Command\HomeCommand(),
            new Command\ExecCommand(),
            new Command\OutdatedCommand(),
            new Command\CheckPlatformReqsCommand(),
            new Command\FundCommand(),
            new Command\ReinstallCommand(),
        ));

        if (strpos(__FILE__, 'phar:') === 0) {
            $commands[] = new Command\SelfUpdateCommand();
        }

        return $commands;
    }

    /**
     * @return string
     */
    public function getLongVersion()
    {
        if (Composer::BRANCH_ALIAS_VERSION && Composer::BRANCH_ALIAS_VERSION !== '@package_branch_alias_version'.'@') {
            return sprintf(
                '<info>%s</info> version <comment>%s (%s)</comment> %s',
                $this->getName(),
                Composer::BRANCH_ALIAS_VERSION,
                $this->getVersion(),
                Composer::RELEASE_DATE
            );
        }

        return parent::getLongVersion() . ' ' . Composer::RELEASE_DATE;
    }

    /**
     * @return InputDefinition
     */
    protected function getDefaultInputDefinition()
    {
        $definition = parent::getDefaultInputDefinition();
        $definition->addOption(new InputOption('--profile', null, InputOption::VALUE_NONE, 'Display timing and memory usage information'));
        $definition->addOption(new InputOption('--no-plugins', null, InputOption::VALUE_NONE, 'Whether to disable plugins.'));
        $definition->addOption(new InputOption('--no-scripts', null, InputOption::VALUE_NONE, 'Skips the execution of all scripts defined in composer.json file.'));
        $definition->addOption(new InputOption('--working-dir', '-d', InputOption::VALUE_REQUIRED, 'If specified, use the given directory as working directory.'));
        $definition->addOption(new InputOption('--no-cache', null, InputOption::VALUE_NONE, 'Prevent use of the cache'));

        return $definition;
    }

    /**
     * @return Command\BaseCommand[]
     */
    private function getPluginCommands()
    {
        $commands = array();

        $composer = $this->getComposer(false, false);
        if (null === $composer) {
            $composer = Factory::createGlobal($this->io);
        }

        if (null !== $composer) {
            $pm = $composer->getPluginManager();
            foreach ($pm->getPluginCapabilities('Composer\Plugin\Capability\CommandProvider', array('composer' => $composer, 'io' => $this->io)) as $capability) {
                $newCommands = $capability->getCommands();
                if (!is_array($newCommands)) {
                    throw new \UnexpectedValueException('Plugin capability '.get_class($capability).' failed to return an array from getCommands');
                }
                foreach ($newCommands as $command) {
                    if (!$command instanceof Command\BaseCommand) {
                        throw new \UnexpectedValueException('Plugin capability '.get_class($capability).' returned an invalid value, we expected an array of Composer\Command\BaseCommand objects');
                    }
                }
                $commands = array_merge($commands, $newCommands);
            }
        }

        return $commands;
    }

    /**
     * Get the working directory at startup time
     *
     * @return string
     */
    public function getInitialWorkingDirectory()
    {
        return $this->initialWorkingDirectory;
    }

    /**
     * @return 'prompt'|bool
     */
    private function getUseParentDirConfigValue()
    {
        $config = Factory::createConfig($this->io);

        return $config->get('use-parent-dir');
    }
}