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<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\composer;

use Composer\Package\PackageInterface;
use Composer\Installer\LibraryInstaller;
use Composer\Repository\InstalledRepositoryInterface;
use Composer\Script\CommandEvent;
use Composer\Script\Event;
use Composer\Util\Filesystem;
use React\Promise\PromiseInterface;

/**
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class Installer extends LibraryInstaller
{
    const EXTRA_BOOTSTRAP = 'bootstrap';
    const EXTENSION_FILE = 'yiisoft/extensions.php';

/**
     * @inheritdoc
     */
    public function supports($packageType)
    {
        return $packageType === 'yii2-extension';
    }

/**
     * @inheritdoc
     */
    public function install(InstalledRepositoryInterface $repo, PackageInterface $package)
    {
        $afterInstall = function () use ($package) {
            // add the package to yiisoft/extensions.php
            $this->addPackage($package);
            // ensure the yii2-dev package also provides Yii.php in the same place as yii2 does
            if ($package->getName() == 'yiisoft/yii2-dev') {
                $this->linkBaseYiiFiles();
            }
        };

// install the package the normal composer way
        $promise = parent::install($repo, $package);

// Composer v2 might return a promise here
        if ($promise instanceof PromiseInterface) {
            return $promise->then($afterInstall);
        }

// If not, execute the code right away as parent::install executed synchronously (composer v1, or v2 without async)
        $afterInstall();
    }

/**
     * @inheritdoc
     */
    public function update(InstalledRepositoryInterface $repo, PackageInterface $initial, PackageInterface $target)
    {
        $afterUpdate = function () use ($initial, $target) {
            $this->removePackage($initial);
            $this->addPackage($target);
            // ensure the yii2-dev package also provides Yii.php in the same place as yii2 does
            if ($initial->getName() == 'yiisoft/yii2-dev') {
                $this->linkBaseYiiFiles();
            }
        };

// update the package the normal composer way
        $promise = parent::update($repo, $initial, $target);

// Composer v2 might return a promise here
        if ($promise instanceof PromiseInterface) {
            return $promise->then($afterUpdate);
        }

// If not, execute the code right away as parent::update executed synchronously (composer v1, or v2 without async)
        $afterUpdate();
    }

/**
     * @inheritdoc
     */
    public function uninstall(InstalledRepositoryInterface $repo, PackageInterface $package)
    {
        $afterUninstall = function () use ($package) {
            // remove the package from yiisoft/extensions.php
            $this->removePackage($package);
            // remove links for Yii.php
            if ($package->getName() == 'yiisoft/yii2-dev') {
                $this->removeBaseYiiFiles();
            }
        };

// uninstall the package the normal composer way
        $promise = parent::uninstall($repo, $package);

// Composer v2 might return a promise here
        if ($promise instanceof PromiseInterface) {
            return $promise->then($afterUninstall);
        }

// If not, execute the code right away as parent::uninstall executed synchronously (composer v1, or v2 without async)
        $afterUninstall();
    }

protected function addPackage(PackageInterface $package)
    {
        $extension = [
            'name' => $package->getName(),
            'version' => $package->getVersion(),
        ];

$alias = $this->generateDefaultAlias($package);
        if (!empty($alias)) {
            $extension['alias'] = $alias;
        }
        $extra = $package->getExtra();
        if (isset($extra[self::EXTRA_BOOTSTRAP])) {
            $extension['bootstrap'] = $extra[self::EXTRA_BOOTSTRAP];
        }

$extensions = $this->loadExtensions();
        $extensions[$package->getName()] = $extension;
        $this->saveExtensions($extensions);
    }

protected function generateDefaultAlias(PackageInterface $package)
    {
        $fs = new Filesystem;
        $vendorDir = $fs->normalizePath($this->vendorDir);
        $autoload = $package->getAutoload();

$aliases = [];

if (!empty($autoload['psr-0'])) {
            foreach ($autoload['psr-0'] as $name => $path) {
                $name = str_replace('\\', '/', trim($name, '\\'));
                if (!$fs->isAbsolutePath($path)) {
                    $path = $this->vendorDir . '/' . $package->getPrettyName() . '/' . $path;
                }
                $path = $fs->normalizePath($path);
                if (strpos($path . '/', $vendorDir . '/') === 0) {
                    $aliases["@$name"] = '<vendor-dir>' . substr($path, strlen($vendorDir)) . '/' . $name;
                } else {
                    $aliases["@$name"] = $path . '/' . $name;
                }
            }
        }

if (!empty($autoload['psr-4'])) {
            foreach ($autoload['psr-4'] as $name => $path) {
                if (is_array($path)) {
                    // ignore psr-4 autoload specifications with multiple search paths
                    // we can not convert them into aliases as they are ambiguous
                    continue;
                }
                $name = str_replace('\\', '/', trim($name, '\\'));
                if (!$fs->isAbsolutePath($path)) {
                    $path = $this->vendorDir . '/' . $package->getPrettyName() . '/' . $path;
                }
                $path = $fs->normalizePath($path);
                if (strpos($path . '/', $vendorDir . '/') === 0) {
                    $aliases["@$name"] = '<vendor-dir>' . substr($path, strlen($vendorDir));
                } else {
                    $aliases["@$name"] = $path;
                }
            }
        }

return $aliases;
    }

protected function removePackage(PackageInterface $package)
    {
        $packages = $this->loadExtensions();
        unset($packages[$package->getName()]);
        $this->saveExtensions($packages);
    }

protected function loadExtensions()
    {
        $file = $this->vendorDir . '/' . static::EXTENSION_FILE;
        if (!is_file($file)) {
            return [];
        }
        // invalidate opcache of extensions.php if exists
        if (function_exists('opcache_invalidate')) {
            @opcache_invalidate($file, true);
        }
        $extensions = require($file);

$vendorDir = str_replace('\\', '/', $this->vendorDir);
        $n = strlen($vendorDir);

foreach ($extensions as &$extension) {
            if (isset($extension['alias'])) {
                foreach ($extension['alias'] as $alias => $path) {
                    $path = str_replace('\\', '/', $path);
                    if (strpos($path . '/', $vendorDir . '/') === 0) {
                        $extension['alias'][$alias] = '<vendor-dir>' . substr($path, $n);
                    }
                }
            }
        }

return $extensions;
    }

protected function saveExtensions(array $extensions)
    {
        $file = $this->vendorDir . '/' . static::EXTENSION_FILE;
        if (!file_exists(dirname($file))) {
            mkdir(dirname($file), 0777, true);
        }
        $array = str_replace("'<vendor-dir>", '$vendorDir . \'', var_export($extensions, true));
        file_put_contents($file, "<?php\n\n\$vendorDir = dirname(__DIR__);\n\nreturn $array;\n");
        // invalidate opcache of extensions.php if exists
        if (function_exists('opcache_invalidate')) {
            @opcache_invalidate($file, true);
        }
    }

protected function linkBaseYiiFiles()
    {
        $yiiDir = $this->vendorDir . '/yiisoft/yii2';
        if (!file_exists($yiiDir)) {
            mkdir($yiiDir, 0777, true);
        }
        foreach (['Yii.php', 'BaseYii.php', 'classes.php'] as $file) {
            file_put_contents($yiiDir . '/' . $file, <<<EOF
<?php
/**
 * This is a link provided by the yiisoft/yii2-dev package via yii2-composer plugin.
 *
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

return require(__DIR__ . '/../yii2-dev/framework/$file');

EOF
            );
        }
    }

protected function removeBaseYiiFiles()
    {
        $yiiDir = $this->vendorDir . '/yiisoft/yii2';
        foreach (['Yii.php', 'BaseYii.php', 'classes.php'] as $file) {
            if (file_exists($yiiDir . '/' . $file)) {
                unlink($yiiDir . '/' . $file);
            }
        }
        if (file_exists($yiiDir)) {
            rmdir($yiiDir);
        }
    }

/**
     * Special method to run tasks defined in `[extra][yii\composer\Installer::postCreateProject]` key in `composer.json`
     *
     * @param Event $event
     */
    public static function postCreateProject($event)
    {
        static::runCommands($event, __METHOD__);
    }

/**
     * Special method to run tasks defined in `[extra][yii\composer\Installer::postInstall]` key in `composer.json`
     *
     * @param Event $event
     * @since 2.0.5
     */
    public static function postInstall($event)
    {
        static::runCommands($event, __METHOD__);
    }

/**
     * Special method to run tasks defined in `[extra][$extraKey]` key in `composer.json`
     *
     * @param Event $event
     * @param string $extraKey
     * @since 2.0.5
     */
    protected static function runCommands($event, $extraKey)
    {
        $params = $event->getComposer()->getPackage()->getExtra();
        if (isset($params[$extraKey]) && is_array($params[$extraKey])) {
            foreach ($params[$extraKey] as $method => $args) {
                call_user_func_array([__CLASS__, $method], (array) $args);
            }
        }
    }

/**
     * Sets the correct permission for the files and directories listed in the extra section.
     * @param array $paths the paths (keys) and the corresponding permission octal strings (values)
     */
    public static function setPermission(array $paths)
    {
        foreach ($paths as $path => $permission) {
            echo "chmod('$path', $permission)...";
            if (is_dir($path) || is_file($path)) {
                try {
                    if (chmod($path, octdec($permission))) {
                        echo "done.\n";
                    };
                } catch (\Exception $e) {
                    echo $e->getMessage() . "\n";
                }
            } else {
                echo "file not found.\n";
            }
        }
    }

/**
     * Generates a cookie validation key for every app config listed in "config" in extra section.
     * You can provide one or multiple parameters as the configuration files which need to have validation key inserted.
     */
    public static function generateCookieValidationKey()
    {
        $configs = func_get_args();
        $key = self::generateRandomString();
        foreach ($configs as $config) {
            if (is_file($config)) {
                $content = preg_replace('/(("|\')cookieValidationKey("|\')\s*=>\s*)(""|\'\')/', "\\1'$key'", file_get_contents($config), -1, $count);
                if ($count > 0) {
                    file_put_contents($config, $content);
                }
            }
        }
    }

protected static function generateRandomString()
    {
        if (!extension_loaded('openssl')) {
            throw new \Exception('The OpenSSL PHP extension is required by Yii2.');
        }
        $length = 32;
        $bytes = openssl_random_pseudo_bytes($length);
        return strtr(substr(base64_encode($bytes), 0, $length), '+/=', '_-.');
    }

/**
     * Copy files to specified locations.
     * @param array $paths The source files paths (keys) and the corresponding target locations
     * for copied files (values). Location can be specified as an array - first element is target
     * location, second defines whether file can be overwritten (by default method don't overwrite
     * existing files).
     * @since 2.0.5
     */
    public static function copyFiles(array $paths)
    {
        foreach ($paths as $source => $target) {
            // handle file target as array [path, overwrite]
            $target = (array) $target;
            echo "Copying file $source to $target[0] - ";

if (!is_file($source)) {
                echo "source file not found.\n";
                continue;
            }

if (is_file($target[0]) && empty($target[1])) {
                echo "target file exists - skip.\n";
                continue;
            } elseif (is_file($target[0]) && !empty($target[1])) {
                echo "target file exists - overwrite - ";
            }

try {
                if (!is_dir(dirname($target[0]))) {
                    mkdir(dirname($target[0]), 0777, true);
                }
                if (copy($source, $target[0])) {
                    echo "done.\n";
                }
            } catch (\Exception $e) {
                echo $e->getMessage() . "\n";
            }
        }
    }
}