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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\Repository\Vcs;
use Composer\Config;
use Composer\Downloader\TransportException;
use Composer\Json\JsonFile;
use Composer\Cache;
use Composer\IO\IOInterface;
use Composer\Util\GitHub;
/**
* @author Jordi Boggiano <j.boggiano@seld.be>
*/
class GitHubDriver extends VcsDriver
{
protected $cache;
protected $owner;
protected $repository;
protected $tags;
protected $branches;
protected $rootIdentifier;
protected $repoData;
protected $hasIssues;
protected $infoCache = array();
protected $isPrivate = false;
/**
* Git Driver
*
* @var GitDriver
*/
protected $gitDriver;
/**
* {@inheritDoc}
*/
public function initialize()
{
preg_match('#^(?:(?:https?|git)://([^/]+)/|git@([^:]+):)([^/]+)/(.+?)(?:\.git|/)?$#', $this->url, $match);
$this->owner = $match[3];
$this->repository = $match[4];
$this->originUrl = !empty($match[1]) ? $match[1] : $match[2];
if ($this->originUrl === 'www.github.com') {
$this->originUrl = 'github.com';
}
$this->cache = new Cache($this->io, $this->config->get('cache-repo-dir').'/'.$this->originUrl.'/'.$this->owner.'/'.$this->repository);
if (isset($this->repoConfig['no-api']) && $this->repoConfig['no-api']) {
$this->setupGitDriver($this->url);
return;
}
$this->fetchRootIdentifier();
}
public function getRepositoryUrl()
{
return 'https://'.$this->originUrl.'/'.$this->owner.'/'.$this->repository;
}
/**
* {@inheritDoc}
*/
public function getRootIdentifier()
{
if ($this->gitDriver) {
return $this->gitDriver->getRootIdentifier();
}
return $this->rootIdentifier;
}
/**
* {@inheritDoc}
*/
public function getUrl()
{
if ($this->gitDriver) {
return $this->gitDriver->getUrl();
}
return 'https://' . $this->originUrl . '/'.$this->owner.'/'.$this->repository.'.git';
}
/**
* {@inheritDoc}
*/
protected function getApiUrl()
{
if ('github.com' === $this->originUrl) {
$apiUrl = 'api.github.com';
} else {
$apiUrl = $this->originUrl . '/api/v3';
}
return 'https://' . $apiUrl;
}
/**
* {@inheritDoc}
*/
public function getSource($identifier)
{
if ($this->gitDriver) {
return $this->gitDriver->getSource($identifier);
}
if ($this->isPrivate) {
// Private GitHub repositories should be accessed using the
// SSH version of the URL.
$url = $this->generateSshUrl();
} else {
$url = $this->getUrl();
}
return array('type' => 'git', 'url' => $url, 'reference' => $identifier);
}
/**
* {@inheritDoc}
*/
public function getDist($identifier)
{
$url = $this->getApiUrl() . '/repos/'.$this->owner.'/'.$this->repository.'/zipball/'.$identifier;
return array('type' => 'zip', 'url' => $url, 'reference' => $identifier, 'shasum' => '');
}
/**
* {@inheritDoc}
*/
public function getComposerInformation($identifier)
{
if ($this->gitDriver) {
return $this->gitDriver->getComposerInformation($identifier);
}
if (!isset($this->infoCache[$identifier])) {
if ($this->shouldCache($identifier) && $res = $this->cache->read($identifier)) {
return $this->infoCache[$identifier] = JsonFile::parseJson($res);
}
$composer = $this->getBaseComposerInformation($identifier);
if ($composer) {
// specials for github
if (!isset($composer['support']['source'])) {
$label = array_search($identifier, $this->getTags()) ?: array_search($identifier, $this->getBranches()) ?: $identifier;
$composer['support']['source'] = sprintf('https://%s/%s/%s/tree/%s', $this->originUrl, $this->owner, $this->repository, $label);
}
if (!isset($composer['support']['issues']) && $this->hasIssues) {
$composer['support']['issues'] = sprintf('https://%s/%s/%s/issues', $this->originUrl, $this->owner, $this->repository);
}
}
if ($this->shouldCache($identifier)) {
$this->cache->write($identifier, json_encode($composer));
}
$this->infoCache[$identifier] = $composer;
}
return $this->infoCache[$identifier];
}
/**
* {@inheritdoc}
*/
public function getFileContent($file, $identifier)
{
if ($this->gitDriver) {
return $this->gitDriver->getFileContent($file, $identifier);
}
$notFoundRetries = 2;
while ($notFoundRetries) {
try {
$resource = $this->getApiUrl() . '/repos/'.$this->owner.'/'.$this->repository.'/contents/' . $file . '?ref='.urlencode($identifier);
$resource = JsonFile::parseJson($this->getContents($resource));
if (empty($resource['content']) || $resource['encoding'] !== 'base64' || !($content = base64_decode($resource['content']))) {
throw new \RuntimeException('Could not retrieve ' . $file . ' for '.$identifier);
}
return $content;
} catch (TransportException $e) {
if (404 !== $e->getCode()) {
throw $e;
}
// TODO should be removed when possible
// retry fetching if github returns a 404 since they happen randomly
$notFoundRetries--;
return null;
}
}
return null;
}
/**
* {@inheritdoc}
*/
public function getChangeDate($identifier)
{
if ($this->gitDriver) {
return $this->gitDriver->getChangeDate($identifier);
}
$resource = $this->getApiUrl() . '/repos/'.$this->owner.'/'.$this->repository.'/commits/'.urlencode($identifier);
$commit = JsonFile::parseJson($this->getContents($resource), $resource);
return new \DateTime($commit['commit']['committer']['date']);
}
/**
* {@inheritDoc}
*/
public function getTags()
{
if ($this->gitDriver) {
return $this->gitDriver->getTags();
}
if (null === $this->tags) {
$this->tags = array();
$resource = $this->getApiUrl() . '/repos/'.$this->owner.'/'.$this->repository.'/tags?per_page=100';
do {
$tagsData = JsonFile::parseJson($this->getContents($resource), $resource);
foreach ($tagsData as $tag) {
$this->tags[$tag['name']] = $tag['commit']['sha'];
}
$resource = $this->getNextPage();
} while ($resource);
}
return $this->tags;
}
/**
* {@inheritDoc}
*/
public function getBranches()
{
if ($this->gitDriver) {
return $this->gitDriver->getBranches();
}
if (null === $this->branches) {
$this->branches = array();
$resource = $this->getApiUrl() . '/repos/'.$this->owner.'/'.$this->repository.'/git/refs/heads?per_page=100';
$branchBlacklist = array('gh-pages');
do {
$branchData = JsonFile::parseJson($this->getContents($resource), $resource);
foreach ($branchData as $branch) {
$name = substr($branch['ref'], 11);
if (!in_array($name, $branchBlacklist)) {
$this->branches[$name] = $branch['object']['sha'];
}
}
$resource = $this->getNextPage();
} while ($resource);
}
return $this->branches;
}
/**
* {@inheritDoc}
*/
public static function supports(IOInterface $io, Config $config, $url, $deep = false)
{
if (!preg_match('#^((?:https?|git)://([^/]+)/|git@([^:]+):)([^/]+)/(.+?)(?:\.git|/)?$#', $url, $matches)) {
return false;
}
$originUrl = !empty($matches[2]) ? $matches[2] : $matches[3];
if (!in_array(preg_replace('{^www\.}i', '', $originUrl), $config->get('github-domains'))) {
return false;
}
if (!extension_loaded('openssl')) {
$io->writeError('Skipping GitHub driver for '.$url.' because the OpenSSL PHP extension is missing.', true, IOInterface::VERBOSE);
return false;
}
return true;
}
/**
* Gives back the loaded <github-api>/repos/<owner>/<repo> result
*
* @return array|null
*/
public function getRepoData()
{
$this->fetchRootIdentifier();
return $this->repoData;
}
/**
* Generate an SSH URL
*
* @return string
*/
protected function generateSshUrl()
{
return 'git@' . $this->originUrl . ':'.$this->owner.'/'.$this->repository.'.git';
}
/**
* {@inheritDoc}
*/
protected function getContents($url, $fetchingRepoData = false)
{
try {
return parent::getContents($url);
} catch (TransportException $e) {
$gitHubUtil = new GitHub($this->io, $this->config, $this->process, $this->remoteFilesystem);
switch ($e->getCode()) {
case 401:
case 404:
// try to authorize only if we are fetching the main /repos/foo/bar data, otherwise it must be a real 404
if (!$fetchingRepoData) {
throw $e;
}
if ($gitHubUtil->authorizeOAuth($this->originUrl)) {
return parent::getContents($url);
}
if (!$this->io->isInteractive()) {
return $this->attemptCloneFallback();
}
$scopesIssued = array();
$scopesNeeded = array();
if ($headers = $e->getHeaders()) {
if ($scopes = $this->remoteFilesystem->findHeaderValue($headers, 'X-OAuth-Scopes')) {
$scopesIssued = explode(' ', $scopes);
}
if ($scopes = $this->remoteFilesystem->findHeaderValue($headers, 'X-Accepted-OAuth-Scopes')) {
$scopesNeeded = explode(' ', $scopes);
}
}
$scopesFailed = array_diff($scopesNeeded, $scopesIssued);
// non-authenticated requests get no scopesNeeded, so ask for credentials
// authenticated requests which failed some scopes should ask for new credentials too
if (!$headers || !count($scopesNeeded) || count($scopesFailed)) {
$gitHubUtil->authorizeOAuthInteractively($this->originUrl, 'Your GitHub credentials are required to fetch private repository metadata (<info>'.$this->url.'</info>)');
}
return parent::getContents($url);
case 403:
if (!$this->io->hasAuthentication($this->originUrl) && $gitHubUtil->authorizeOAuth($this->originUrl)) {
return parent::getContents($url);
}
if (!$this->io->isInteractive() && $fetchingRepoData) {
return $this->attemptCloneFallback();
}
$rateLimited = $githubUtil->isRateLimited($e->getHeaders());
if (!$this->io->hasAuthentication($this->originUrl)) {
if (!$this->io->isInteractive()) {
$this->io->writeError('<error>GitHub API limit exhausted. Failed to get metadata for the '.$this->url.' repository, try running in interactive mode so that you can enter your GitHub credentials to increase the API limit</error>');
throw $e;
}
$gitHubUtil->authorizeOAuthInteractively($this->originUrl, 'API limit exhausted. Enter your GitHub credentials to get a larger API limit (<info>'.$this->url.'</info>)');
return parent::getContents($url);
}
if ($rateLimited) {
$rateLimit = $githubUtil->getRateLimit($e->getHeaders());
$this->io->writeError(sprintf(
'<error>GitHub API limit (%d calls/hr) is exhausted. You are already authorized so you have to wait until %s before doing more requests</error>',
$rateLimit['limit'],
$rateLimit['reset']
));
}
throw $e;
default:
throw $e;
}
}
}
/**
* Fetch root identifier from GitHub
*
* @throws TransportException
*/
protected function fetchRootIdentifier()
{
if ($this->repoData) {
return;
}
$repoDataUrl = $this->getApiUrl() . '/repos/'.$this->owner.'/'.$this->repository;
$this->repoData = JsonFile::parseJson($this->getContents($repoDataUrl, true), $repoDataUrl);
if (null === $this->repoData && null !== $this->gitDriver) {
return;
}
$this->owner = $this->repoData['owner']['login'];
$this->repository = $this->repoData['name'];
$this->isPrivate = !empty($this->repoData['private']);
if (isset($this->repoData['default_branch'])) {
$this->rootIdentifier = $this->repoData['default_branch'];
} elseif (isset($this->repoData['master_branch'])) {
$this->rootIdentifier = $this->repoData['master_branch'];
} else {
$this->rootIdentifier = 'master';
}
$this->hasIssues = !empty($this->repoData['has_issues']);
}
protected function attemptCloneFallback()
{
$this->isPrivate = true;
try {
// If this repository may be private (hard to say for sure,
// GitHub returns 404 for private repositories) and we
// cannot ask for authentication credentials (because we
// are not interactive) then we fallback to GitDriver.
$this->setupGitDriver($this->generateSshUrl());
return;
} catch (\RuntimeException $e) {
$this->gitDriver = null;
$this->io->writeError('<error>Failed to clone the '.$this->generateSshUrl().' repository, try running in interactive mode so that you can enter your GitHub credentials</error>');
throw $e;
}
}
protected function setupGitDriver($url)
{
$this->gitDriver = new GitDriver(
array('url' => $url),
$this->io,
$this->config,
$this->process,
$this->remoteFilesystem
);
$this->gitDriver->initialize();
}
protected function getNextPage()
{
$headers = $this->remoteFilesystem->getLastHeaders();
foreach ($headers as $header) {
if (preg_match('{^link:\s*(.+?)\s*$}i', $header, $match)) {
$links = explode(',', $match[1]);
foreach ($links as $link) {
if (preg_match('{<(.+?)>; *rel="next"}', $link, $match)) {
return $match[1];
}
}
}
}
}
}
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