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composer-setup.php
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<?php
/*
* This file is part of Composer.
*
* (c) Nils Adermann <[email protected]>
* Jordi Boggiano <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
setupEnvironment();
process(is_array($argv) ? $argv : array());
/**
* Initializes various values
*
* @throws RuntimeException If uopz extension prevents exit calls
*/
function setupEnvironment() { ini_set('display_errors', 1);
if (extension_loaded('uopz') && ! ( ini_get('uopz.disable') || ini_get('uopz.exit') ) ) {
// uopz works at opcode level and disables exit calls
if (function_exists('uopz_allow_exit') ) {
@uopz_allow_exit(true);
} else {
throw new RuntimeException('The uopz extension ignores exit calls and breaks this installer.');
}
}
$installer = 'ComposerInstaller';
if (defined('PHP_WINDOWS_VERSION_MAJOR') ) {
if ($version = getenv('COMPOSERSETUP') ) {
$installer = sprintf('Composer-Setup.exe/%s', $version);
}
}
define('COMPOSER_INSTALLER', $installer);
}
/**
* Processes the installer
*/
function process( $argv ) {
// Determine ANSI output from --ansi and --no-ansi flags
setUseAnsi($argv);
if (in_array('--help', $argv) ) {
displayHelp();
exit(0);
}
$check = in_array('--check', $argv);
$help = in_array('--help', $argv);
$force = in_array('--force', $argv);
$quiet = in_array('--quiet', $argv);
$channel = 'stable';
if (in_array('--snapshot', $argv) ) {
$channel = 'snapshot';
} elseif (in_array('--preview', $argv) ) {
$channel = 'preview';
} elseif (in_array('--1', $argv) ) {
$channel = '1';
} elseif (in_array('--2', $argv) ) {
$channel = '2';
}
$disableTls = in_array('--disable-tls', $argv);
$installDir = getOptValue('--install-dir', $argv, false);
$version = getOptValue('--version', $argv, false);
$filename = getOptValue('--filename', $argv, 'composer.phar');
$cafile = getOptValue('--cafile', $argv, false);
if ( ! checkParams($installDir, $version, $cafile) ) {
exit(1);
}
$ok = checkPlatform($warnings, $quiet, $disableTls, true);
if ($check ) {
// Only show warnings if we haven't output any errors
if ($ok ) {
showWarnings($warnings);
showSecurityWarning($disableTls);
}
exit($ok ? 0 : 1);
}
if ($ok || $force ) {
$installer = new Installer($quiet, $disableTls, $cafile);
if ($installer->run($version, $installDir, $filename, $channel) ) {
showWarnings($warnings);
showSecurityWarning($disableTls);
exit(0);
}
}
exit(1);
}
/**
* Displays the help
*/
function displayHelp() { echo <<<EOF
Composer Installer
------------------
Options
--help this help
--check for checking environment only
--force forces the installation
--ansi force ANSI color output
--no-ansi disable ANSI color output
--quiet do not output unimportant messages
--install-dir="..." accepts a target installation directory
--preview install the latest version from the preview (alpha/beta/rc) channel instead of stable
--snapshot install the latest version from the snapshot (dev builds) channel instead of stable
--1 install the latest stable Composer 1.x version
--2 install the latest stable Composer 2.x version
--version="..." accepts a specific version to install instead of the latest
--filename="..." accepts a target filename (default: composer.phar)
--disable-tls disable SSL/TLS security for file downloads
--cafile="..." accepts a path to a Certificate Authority (CA) certificate file for SSL/TLS verification
EOF;
}
/**
* Sets the USE_ANSI define for colorizing output
*
* @param array $argv Command-line arguments
*/
function setUseAnsi( $argv ) {
// --no-ansi wins over --ansi
if (in_array('--no-ansi', $argv) ) {
define('USE_ANSI', false);
} elseif (in_array('--ansi', $argv) ) {
define('USE_ANSI', true);
} else {
// On Windows, default to no ANSI, except in ANSICON and ConEmu.
// Everywhere else, default to ANSI if stdout is a terminal.
define(
'USE_ANSI',
( DIRECTORY_SEPARATOR == '\\' )
? ( false !== getenv('ANSICON') || 'ON' === getenv('ConEmuANSI') )
: ( function_exists('posix_isatty') && posix_isatty(1) )
);
}
}
/**
* Returns the value of a command-line option
*
* @param string $opt The command-line option to check
* @param array $argv Command-line arguments
* @param mixed $default Default value to be returned
*
* @return mixed The command-line value or the default
*/
function getOptValue( $opt, $argv, $default ) {
$optLength = strlen($opt);
foreach ($argv as $key => $value ) {
$next = $key + 1;
if (0 === strpos($value, $opt) ) {
if ($optLength === strlen($value) && isset($argv[ $next ]) ) {
return trim($argv[ $next ]);
} else {
return trim(substr($value, $optLength + 1));
}
}
}
return $default;
}
/**
* Checks that user-supplied params are valid
*
* @param mixed $installDir The required istallation directory
* @param mixed $version The required composer version to install
* @param mixed $cafile Certificate Authority file
*
* @return bool True if the supplied params are okay
*/
function checkParams( $installDir, $version, $cafile ) {
$result = true;
if (false !== $installDir && ! is_dir($installDir) ) {
out("The defined install dir ({$installDir}) does not exist.", 'info');
$result = false;
}
if (false !== $version && 1 !== preg_match('/^\d+\.\d+\.\d+(\-(alpha|beta|RC)\d*)*$/', $version) ) {
out("The defined install version ({$version}) does not match release pattern.", 'info');
$result = false;
}
if (false !== $cafile && ( ! file_exists($cafile) || ! is_readable($cafile) ) ) {
out("The defined Certificate Authority (CA) cert file ({$cafile}) does not exist or is not readable.", 'info');
$result = false;
}
return $result;
}
/**
* Checks the platform for possible issues running Composer
*
* Errors are written to the output, warnings are saved for later display.
*
* @param array $warnings Populated by method, to be shown later
* @param bool $quiet Quiet mode
* @param bool $disableTls Bypass tls
* @param bool $install If we are installing, rather than diagnosing
*
* @return bool True if there are no errors
*/
function checkPlatform( &$warnings, $quiet, $disableTls, $install ) {
getPlatformIssues($errors, $warnings, $install);
// Make openssl warning an error if tls has not been specifically disabled
if (isset($warnings['openssl']) && ! $disableTls ) {
$errors['openssl'] = $warnings['openssl'];
unset($warnings['openssl']);
}
if ( ! empty($errors) ) {
// Composer-Setup.exe uses "Some settings" to flag platform errors
out('Some settings on your machine make Composer unable to work properly.', 'error');
out('Make sure that you fix the issues listed below and run this script again:', 'error');
outputIssues($errors);
return false;
}
if (empty($warnings) && ! $quiet ) {
out('All settings correct for using Composer', 'success');
}
return true;
}
/**
* Checks platform configuration for common incompatibility issues
*
* @param array $errors Populated by method
* @param array $warnings Populated by method
* @param bool $install If we are installing, rather than diagnosing
*
* @return bool If any errors or warnings have been found
*/
function getPlatformIssues( &$errors, &$warnings, $install ) {
$errors = array();
$warnings = array();
if ($iniPath = php_ini_loaded_file() ) {
$iniMessage = PHP_EOL . 'The php.ini used by your command-line PHP is: ' . $iniPath;
} else {
$iniMessage = PHP_EOL . 'A php.ini file does not exist. You will have to create one.';
}
$iniMessage .= PHP_EOL . 'If you can not modify the ini file, you can also run `php -d option=value` to modify ini values on the fly. You can use -d multiple times.';
if (ini_get('detect_unicode') ) {
$errors['unicode'] = array(
'The detect_unicode setting must be disabled.',
'Add the following to the end of your `php.ini`:',
' detect_unicode = Off',
$iniMessage,
);
}
if (extension_loaded('suhosin') ) {
$suhosin = ini_get('suhosin.executor.include.whitelist');
$suhosinBlacklist = ini_get('suhosin.executor.include.blacklist');
if (false === stripos($suhosin, 'phar') && ( ! $suhosinBlacklist || false !== stripos($suhosinBlacklist, 'phar') ) ) {
$errors['suhosin'] = array(
'The suhosin.executor.include.whitelist setting is incorrect.',
'Add the following to the end of your `php.ini` or suhosin.ini (Example path [for Debian]: /etc/php5/cli/conf.d/suhosin.ini):',
' suhosin.executor.include.whitelist = phar ' . $suhosin,
$iniMessage,
);
}
}
if ( ! function_exists('json_decode') ) {
$errors['json'] = array(
'The json extension is missing.',
'Install it or recompile php without --disable-json',
);
}
if ( ! extension_loaded('Phar') ) {
$errors['phar'] = array(
'The phar extension is missing.',
'Install it or recompile php without --disable-phar',
);
}
if ( ! extension_loaded('filter') ) {
$errors['filter'] = array(
'The filter extension is missing.',
'Install it or recompile php without --disable-filter',
);
}
if ( ! extension_loaded('hash') ) {
$errors['hash'] = array(
'The hash extension is missing.',
'Install it or recompile php without --disable-hash',
);
}
if ( ! extension_loaded('iconv') && ! extension_loaded('mbstring') ) {
$errors['iconv_mbstring'] = array(
'The iconv OR mbstring extension is required and both are missing.',
'Install either of them or recompile php without --disable-iconv',
);
}
if ( ! ini_get('allow_url_fopen') ) {
$errors['allow_url_fopen'] = array(
'The allow_url_fopen setting is incorrect.',
'Add the following to the end of your `php.ini`:',
' allow_url_fopen = On',
$iniMessage,
);
}
if (extension_loaded('ionCube Loader') && ioncube_loader_iversion() < 40009 ) {
$ioncube = ioncube_loader_version();
$errors['ioncube'] = array(
'Your ionCube Loader extension (' . $ioncube . ') is incompatible with Phar files.',
'Upgrade to ionCube 4.0.9 or higher or remove this line (path may be different) from your `php.ini` to disable it:',
' zend_extension = /usr/lib/php5/20090626+lfs/ioncube_loader_lin_5.3.so',
$iniMessage,
);
}
if (version_compare(PHP_VERSION, '5.3.2', '<') ) {
$errors['php'] = array(
'Your PHP (' . PHP_VERSION . ') is too old, you must upgrade to PHP 5.3.2 or higher.',
);
}
if (version_compare(PHP_VERSION, '5.3.4', '<') ) {
$warnings['php'] = array(
'Your PHP (' . PHP_VERSION . ') is quite old, upgrading to PHP 5.3.4 or higher is recommended.',
'Composer works with 5.3.2+ for most people, but there might be edge case issues.',
);
}
if ( ! extension_loaded('openssl') ) {
$warnings['openssl'] = array(
'The openssl extension is missing, which means that secure HTTPS transfers are impossible.',
'If possible you should enable it or recompile php with --with-openssl',
);
}
if (extension_loaded('openssl') && OPENSSL_VERSION_NUMBER < 0x1000100f ) {
// Attempt to parse version number out, fallback to whole string value.
$opensslVersion = trim(strstr(OPENSSL_VERSION_TEXT, ' '));
$opensslVersion = substr($opensslVersion, 0, strpos($opensslVersion, ' '));
$opensslVersion = $opensslVersion ? $opensslVersion : OPENSSL_VERSION_TEXT;
$warnings['openssl_version'] = array(
'The OpenSSL library (' . $opensslVersion . ') used by PHP does not support TLSv1.2 or TLSv1.1.',
'If possible you should upgrade OpenSSL to version 1.0.1 or above.',
);
}
if ( ! defined('HHVM_VERSION') && ! extension_loaded('apcu') && ini_get('apc.enable_cli') ) {
$warnings['apc_cli'] = array(
'The apc.enable_cli setting is incorrect.',
'Add the following to the end of your `php.ini`:',
' apc.enable_cli = Off',
$iniMessage,
);
}
if ( ! $install && extension_loaded('xdebug') ) {
$warnings['xdebug_loaded'] = array(
'The xdebug extension is loaded, this can slow down Composer a little.',
'Disabling it when using Composer is recommended.',
);
if (ini_get('xdebug.profiler_enabled') ) {
$warnings['xdebug_profile'] = array(
'The xdebug.profiler_enabled setting is enabled, this can slow down Composer a lot.',
'Add the following to the end of your `php.ini` to disable it:',
' xdebug.profiler_enabled = 0',
$iniMessage,
);
}
}
if ( ! extension_loaded('zlib') ) {
$warnings['zlib'] = array(
'The zlib extension is not loaded, this can slow down Composer a lot.',
'If possible, install it or recompile php with --with-zlib',
$iniMessage,
);
}
if (defined('PHP_WINDOWS_VERSION_BUILD')
&& ( version_compare(PHP_VERSION, '7.2.23', '<')
|| ( version_compare(PHP_VERSION, '7.3.0', '>=')
&& version_compare(PHP_VERSION, '7.3.10', '<') ) ) ) {
$warnings['onedrive'] = array(
'The Windows OneDrive folder is not supported on PHP versions below 7.2.23 and 7.3.10.',
'Upgrade your PHP (' . PHP_VERSION . ') to use this location with Composer.',
);
}
if (extension_loaded('uopz') && ! ( ini_get('uopz.disable') || ini_get('uopz.exit') ) ) {
$warnings['uopz'] = array(
'The uopz extension ignores exit calls and may not work with all Composer commands.',
'Disabling it when using Composer is recommended.',
);
}
ob_start();
phpinfo(INFO_GENERAL);
$phpinfo = ob_get_clean();
if (preg_match('{Configure Command(?: *</td><td class="v">| *=> *)(.*?)(?:</td>|$)}m', $phpinfo, $match) ) {
$configure = $match[1];
if (false !== strpos($configure, '--enable-sigchild') ) {
$warnings['sigchild'] = array(
'PHP was compiled with --enable-sigchild which can cause issues on some platforms.',
'Recompile it without this flag if possible, see also:',
' https://bugs.php.net/bug.php?id=22999',
);
}
if (false !== strpos($configure, '--with-curlwrappers') ) {
$warnings['curlwrappers'] = array(
'PHP was compiled with --with-curlwrappers which will cause issues with HTTP authentication and GitHub.',
'Recompile it without this flag if possible',
);
}
}
// Stringify the message arrays
foreach ($errors as $key => $value ) {
$errors[ $key ] = PHP_EOL . implode(PHP_EOL, $value);
}
foreach ($warnings as $key => $value ) {
$warnings[ $key ] = PHP_EOL . implode(PHP_EOL, $value);
}
return ! empty($errors) || ! empty($warnings);
}
/**
* Outputs an array of issues
*
* @param array $issues
*/
function outputIssues( $issues ) {
foreach ($issues as $issue ) {
out($issue, 'info');
}
out('');
}
/**
* Outputs any warnings found
*
* @param array $warnings
*/
function showWarnings( $warnings ) {
if ( ! empty($warnings) ) {
out('Some settings on your machine may cause stability issues with Composer.', 'error');
out('If you encounter issues, try to change the following:', 'error');
outputIssues($warnings);
}
}
/**
* Outputs an end of process warning if tls has been bypassed
*
* @param bool $disableTls Bypass tls
*/
function showSecurityWarning( $disableTls ) {
if ($disableTls ) {
out('You have instructed the Installer not to enforce SSL/TLS security on remote HTTPS requests.', 'info');
out('This will leave all downloads during installation vulnerable to Man-In-The-Middle (MITM) attacks', 'info');
}
}
/**
* colorize output
*/
function out( $text, $color = null, $newLine = true ) {
$styles = array(
'success' => "\033[0;32m%s\033[0m",
'error' => "\033[31;31m%s\033[0m",
'info' => "\033[33;33m%s\033[0m",
);
$format = '%s';
if (isset($styles[ $color ]) && USE_ANSI ) {
$format = $styles[ $color ];
}
if ($newLine ) {
$format .= PHP_EOL;
}
printf($format, $text);
}
/**
* Returns the system-dependent Composer home location, which may not exist
*
* @return string
*/
function getHomeDir() { $home = getenv('COMPOSER_HOME');
if ($home ) {
return $home;
}
$userDir = getUserDir();
if (defined('PHP_WINDOWS_VERSION_MAJOR') ) {
return $userDir . '/Composer';
}
$dirs = array();
if (useXdg() ) {
// XDG Base Directory Specifications
$xdgConfig = getenv('XDG_CONFIG_HOME');
if ( ! $xdgConfig ) {
$xdgConfig = $userDir . '/.config';
}
$dirs[] = $xdgConfig . '/composer';
}
$dirs[] = $userDir . '/.composer';
// select first dir which exists of: $XDG_CONFIG_HOME/composer or ~/.composer
foreach ($dirs as $dir ) {
if (is_dir($dir) ) {
return $dir;
}
}
// if none exists, we default to first defined one (XDG one if system uses it, or ~/.composer otherwise)
return $dirs[0];
}
/**
* Returns the location of the user directory from the environment
*
* @throws RuntimeException If the environment value does not exists
*
* @return string
*/
function getUserDir() { $userEnv = defined('PHP_WINDOWS_VERSION_MAJOR') ? 'APPDATA' : 'HOME';
$userDir = getenv($userEnv);
if ( ! $userDir ) {
throw new RuntimeException('The ' . $userEnv . ' or COMPOSER_HOME environment variable must be set for composer to run correctly');
}
return rtrim(strtr($userDir, '\\', '/'), '/');
}
/**
* @return bool
*/
function useXdg() { foreach (array_keys($_SERVER) as $key ) {
if (strpos($key, 'XDG_') === 0 ) {
return true;
}
}
if (is_dir('/etc/xdg') ) {
return true;
}
return false;
}
function validateCaFile( $contents ) {
// assume the CA is valid if php is vulnerable to
// https://www.sektioneins.de/advisories/advisory-012013-php-openssl_x509_parse-memory-corruption-vulnerability.html
if (
PHP_VERSION_ID <= 50327
|| ( PHP_VERSION_ID >= 50400 && PHP_VERSION_ID < 50422 )
|| ( PHP_VERSION_ID >= 50500 && PHP_VERSION_ID < 50506 )
) {
return ! empty($contents);
}
return (bool) openssl_x509_parse($contents);
}
class Installer {
private $quiet;
private $disableTls;
private $cafile;
private $displayPath;
private $target;
private $tmpFile;
private $tmpCafile;
private $baseUrl;
private $algo;
private $errHandler;
private $httpClient;
private $pubKeys = array();
private $installs = array();
/**
* Constructor - must not do anything that throws an exception
*
* @param bool $quiet Quiet mode
* @param bool $disableTls Bypass tls
* @param mixed $cafile Path to CA bundle, or false
*/
public function __construct( $quiet, $disableTls, $caFile ) {
if (( $this->quiet = $quiet ) ) {
ob_start();
}
$this->disableTls = $disableTls;
$this->cafile = $caFile;
$this->errHandler = new ErrorHandler();
}
/**
* Runs the installer
*
* @param mixed $version Specific version to install, or false
* @param mixed $installDir Specific installation directory, or false
* @param string $filename Specific filename to save to, or composer.phar
* @param string $channel Specific version channel to use
* @throws Exception If anything other than a RuntimeException is caught
*
* @return bool If the installation succeeded
*/
public function run( $version, $installDir, $filename, $channel ) {
try {
$this->initTargets($installDir, $filename);
$this->initTls();
$this->httpClient = new HttpClient($this->disableTls, $this->cafile);
$result = $this->install($version, $channel);
// in case --1 or --2 is passed, we leave the default channel for next self-update to stable
if (is_numeric($channel) ) {
$channel = 'stable';
}
if ($result && $channel !== 'stable' && ! $version && defined('PHP_BINARY') ) {
$null = ( defined('PHP_WINDOWS_VERSION_MAJOR') ? 'NUL' : '/dev/null' );
@exec(escapeshellarg(PHP_BINARY) . ' ' . escapeshellarg($this->target) . ' self-update --' . $channel . ' --set-channel-only -q > ' . $null . ' 2> ' . $null, $output);
}
} catch (Exception $e ) {
$result = false;
}
// Always clean up
$this->cleanUp($result);
if (isset($e) ) {
// Rethrow anything that is not a RuntimeException
if ( ! $e instanceof RuntimeException ) {
throw $e;
}
out($e->getMessage(), 'error');
}
return $result;
}
/**
* Initialization methods to set the required filenames and composer url
*
* @param mixed $installDir Specific installation directory, or false
* @param string $filename Specific filename to save to, or composer.phar
* @throws RuntimeException If the installation directory is not writable
*/
protected function initTargets( $installDir, $filename ) {
$this->displayPath = ( $installDir ? rtrim($installDir, '/') . '/' : '' ) . $filename;
$installDir = $installDir ? realpath($installDir) : getcwd();
if ( ! is_writeable($installDir) ) {
throw new RuntimeException('The installation directory "' . $installDir . '" is not writable');
}
$this->target = $installDir . DIRECTORY_SEPARATOR . $filename;
$this->tmpFile = $installDir . DIRECTORY_SEPARATOR . basename($this->target, '.phar') . '-temp.phar';
$uriScheme = $this->disableTls ? 'http' : 'https';
$this->baseUrl = $uriScheme . '://getcomposer.org';
}
/**
* A wrapper around methods to check tls and write public keys
*
* @throws RuntimeException If SHA384 is not supported
*/
protected function initTls() { if ($this->disableTls ) {
return;
}
if ( ! in_array('sha384', array_map('strtolower', openssl_get_md_methods())) ) {
throw new RuntimeException('SHA384 is not supported by your openssl extension');
}
$this->algo = defined('OPENSSL_ALGO_SHA384') ? OPENSSL_ALGO_SHA384 : 'SHA384';
$home = $this->getComposerHome();
$this->pubKeys = array(
'dev' => $this->installKey(self::getPKDev(), $home, 'keys.dev.pub'),
'tags' => $this->installKey(self::getPKTags(), $home, 'keys.tags.pub'),
);
if (empty($this->cafile) && ! HttpClient::getSystemCaRootBundlePath() ) {
$this->cafile = $this->tmpCafile = $this->installKey(HttpClient::getPackagedCaFile(), $home, 'cacert-temp.pem');
}
}
/**
* Returns the Composer home directory, creating it if required
*
* @throws RuntimeException If the directory cannot be created
*
* @return string
*/
protected function getComposerHome() { $home = getHomeDir();
if ( ! is_dir($home) ) {
$this->errHandler->start();
if ( ! mkdir($home, 0777, true) ) {
throw new RuntimeException(
sprintf(
'Unable to create Composer home directory "%s": %s',
$home,
$this->errHandler->message
)
);
}
$this->installs[] = $home;
$this->errHandler->stop();
}
return $home;
}
/**
* Writes public key data to disc
*
* @param string $data The public key(s) in pem format
* @param string $path The directory to write to
* @param string $filename The name of the file
* @throws RuntimeException If the file cannot be written
*
* @return string The path to the saved data
*/
protected function installKey( $data, $path, $filename ) {
$this->errHandler->start();
$target = $path . DIRECTORY_SEPARATOR . $filename;
$installed = file_exists($target);
$write = file_put_contents($target, $data, LOCK_EX);
@chmod($target, 0644);
$this->errHandler->stop();
if ( ! $write ) {
throw new RuntimeException(sprintf('Unable to write %s to: %s', $filename, $path));
}
if ( ! $installed ) {
$this->installs[] = $target;
}
return $target;
}
/**
* The main install function
*
* @param mixed $version Specific version to install, or false
* @param string $channel Version channel to use
*
* @return bool If the installation succeeded
*/
protected function install( $version, $channel ) {
$retries = 3;
$result = false;
$infoMsg = 'Downloading...';
$infoType = 'info';
while ($retries-- ) {
if ( ! $this->quiet ) {
out($infoMsg, $infoType);
$infoMsg = 'Retrying...';
$infoType = 'error';
}
if ( ! $this->getVersion($channel, $version, $url, $error) ) {
out($error, 'error');
continue;
}
if ( ! $this->downloadToTmp($url, $signature, $error) ) {
out($error, 'error');
continue;
}
if ( ! $this->verifyAndSave($version, $signature, $error) ) {
out($error, 'error');
continue;
}
$result = true;
break;
}
if ( ! $this->quiet ) {
if ($result ) {
out(PHP_EOL . "Composer (version {$version}) successfully installed to: {$this->target}", 'success');
out("Use it: php {$this->displayPath}", 'info');
out('');
} else {
out('The download failed repeatedly, aborting.', 'error');
}
}
return $result;
}
/**
* Sets the version url, downloading version data if required
*
* @param string $channel Version channel to use
* @param false|string $version Version to install, or set by method
* @param null|string $url The versioned url, set by method
* @param null|string $error Set by method on failure
*
* @return bool If the operation succeeded
*/
protected function getVersion( $channel, &$version, &$url, &$error ) {
$error = '';
if ($version ) {
if (empty($url) ) {
$url = $this->baseUrl . "/download/{$version}/composer.phar";
}
return true;
}
$this->errHandler->start();
if ($this->downloadVersionData($data, $error) ) {
$this->parseVersionData($data, $channel, $version, $url);
}
$this->errHandler->stop();
return empty($error);
}
/**
* Downloads and json-decodes version data
*
* @param null|array $data Downloaded version data, set by method
* @param null|string $error Set by method on failure
*
* @return bool If the operation succeeded
*/
protected function downloadVersionData( &$data, &$error ) {
$url = $this->baseUrl . '/versions';
$errFmt = 'The "%s" file could not be %s: %s';
if ( ! $json = $this->httpClient->get($url) ) {
$error = sprintf($errFmt, $url, 'downloaded', $this->errHandler->message);
return false;
}
if ( ! $data = json_decode($json, true) ) {
$error = sprintf($errFmt, $url, 'json-decoded', $this->getJsonError());
return false;
}
return true;
}
/**
* A wrapper around the methods needed to download and save the phar
*
* @param string $url The versioned download url
* @param null|string $signature Set by method on successful download
* @param null|string $error Set by method on failure
*
* @return bool If the operation succeeded
*/
protected function downloadToTmp( $url, &$signature, &$error ) {
$error = '';
$errFmt = 'The "%s" file could not be downloaded: %s';
$sigUrl = $url . '.sig';
$this->errHandler->start();
if ( ! $fh = fopen($this->tmpFile, 'w') ) {
$error = sprintf('Could not create file "%s": %s', $this->tmpFile, $this->errHandler->message);
} elseif ( ! $this->getSignature($sigUrl, $signature) ) {
$error = sprintf($errFmt, $sigUrl, $this->errHandler->message);
} elseif ( ! fwrite($fh, $this->httpClient->get($url)) ) {
$error = sprintf($errFmt, $url, $this->errHandler->message);
}
if (is_resource($fh) ) {
fclose($fh);
}
$this->errHandler->stop();
return empty($error);
}
/**
* Verifies the downloaded file and saves it to the target location
*
* @param string $version The composer version downloaded
* @param string $signature The digital signature to check
* @param null|string $error Set by method on failure
*
* @return bool If the operation succeeded
*/
protected function verifyAndSave( $version, $signature, &$error ) {
$error = '';
if ( ! $this->validatePhar($this->tmpFile, $pharError) ) {
$error = 'The download is corrupt: ' . $pharError;
} elseif ( ! $this->verifySignature($version, $signature, $this->tmpFile) ) {
$error = 'Signature mismatch, could not verify the phar file integrity';
} else {
$this->errHandler->start();
if ( ! rename($this->tmpFile, $this->target) ) {
$error = sprintf('Could not write to file "%s": %s', $this->target, $this->errHandler->message);
}
chmod($this->target, 0755);
$this->errHandler->stop();
}
return empty($error);
}
/**
* Parses an array of version data to match the required channel
*
* @param array $data Downloaded version data
* @param mixed $channel Version channel to use
* @param false|string $version Set by method
* @param mixed $url The versioned url, set by method
*/
protected function parseVersionData( array $data, $channel, &$version, &$url ) {
foreach ($data[ $channel ] as $candidate ) {
if ($candidate['min-php'] <= PHP_VERSION_ID ) {
$version = $candidate['version'];
$url = $this->baseUrl . $candidate['path'];
break;
}
}
if ( ! $version ) {
$error = sprintf(
'None of the %d %s version(s) of Composer matches your PHP version (%s / ID: %d)',
count($data[ $channel ]),
$channel,
PHP_VERSION,
PHP_VERSION_ID
);
throw new RuntimeException($error);
}
}
/**
* Downloads the digital signature of required phar file
*
* @param string $url The signature url
* @param null|string $signature Set by method on success
*
* @return bool If the download succeeded
*/
protected function getSignature( $url, &$signature ) {
if ( ! $result = $this->disableTls ) {
$signature = $this->httpClient->get($url);
if ($signature ) {
$signature = json_decode($signature, true);
$signature = base64_decode($signature['sha384']);
$result = true;
}
}