github.php

<?php

class HttpException extends Exception
{
	/**
	 * List of HTTP status codes
	 *
	 * From http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
	 *
	 * @var array
	 */
	private $status = [
		400 => 'Bad Request',
		401 => 'Unauthorized',
		402 => 'Payment Required',
		403 => 'Forbidden',
		404 => 'Not Found',
		405 => 'Method Not Allowed',
		406 => 'Not Acceptable',
		407 => 'Proxy Authentication Required',
		408 => 'Request Timeout',
		409 => 'Conflict',
		410 => 'Gone',
		411 => 'Length Required',
		412 => 'Precondition Failed',
		413 => 'Request Entity Too Large',
		414 => 'Request-URI Too Long',
		415 => 'Unsupported Media Type',
		416 => 'Requested Range Not Satisfiable',
		417 => 'Expectation Failed',
		418 => 'I\'m a teapot', // RFC 2324
		426 => 'Upgrade Required', // RFC 2817
		428 => 'Precondition Required', // RFC 6585
	];

	/**
	 * @param int     $status     Defaults to 400
	 * @param ?string $statusText If null, will use the default status phrase
	 */
	public function __construct(int $status = 400, string $statusText = null)
	{
		if ($statusText === null && isset($this->status[$status]))
			$statusText = $this->status[$status];
		parent::__construct($statusText, $status);
	}
}

class HttpResponse
{
	/**
	 * List of HTTP status codes
	 *
	 * From http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
	 *
	 * @var array
	 */
	private $status = [
		200 => 'OK',
		201 => 'Created',
		202 => 'Accepted',
		203 => 'Non-Authoritative Information',
		204 => 'No Content',
		205 => 'Reset Content',
		206 => 'Partial Content',
		207 => 'Multi-Status',
		300 => 'Multiple Choices',
		301 => 'Moved Permanently',
		302 => 'Found',
		303 => 'See Other',
		304 => 'Not Modified',
		307 => 'Temporary Redirect',
		308 => 'Permanent Redirect',
		400 => 'Bad Request',
		401 => 'Unauthorized',
		402 => 'Payment Required',
		403 => 'Forbidden',
		404 => 'Not Found',
		405 => 'Method Not Allowed',
		406 => 'Not Acceptable',
		407 => 'Proxy Authentication Required',
		408 => 'Request Timeout',
		409 => 'Conflict',
		410 => 'Gone',
		411 => 'Length Required',
		412 => 'Precondition Failed',
		413 => 'Request Entity Too Large',
		414 => 'Request-URI Too Long',
		415 => 'Unsupported Media Type',
		416 => 'Requested Range Not Satisfiable',
		417 => 'Expectation Failed',
		418 => 'I\'m a teapot', // RFC 2324
		426 => 'Upgrade Required', // RFC 2817
		428 => 'Precondition Required', // RFC 6585
	];

	/**
	 * @param int     $status     Defaults to 400
	 * @param ?string $statusText If null, will use the default status phrase
	 * @param ?array  $headers    List of additional headers
	 * @param ?array  $data       Data to output JSON-encoded
	 */
	public function __construct(
		int $status = 400,
		?string $statusText = null,
		?array $headers = null,
		?array $data = null
	)
	{
		if ($statusText === null && isset($this->status[$status]))
			$statusText = $this->status[$status];

		header(sprintf('HTTP/1.1 %d %s', $status, $statusText));

		if ($headers !== null)
			foreach ($headers as $key => $header)
			{
				if (!is_int($key))
					$header = $key . ': ' . $header;

				header($header);
			}

		echo $data === null ? [] : json_encode($data);
	}
}

function parse_headers($headers)
{
	$head = array();
	foreach ($headers as $k => $v)
	{
		$t = explode(':', $v, 2);
		if (isset($t[1]))
			$head[trim($t[0])] = trim($t[1]);
		else
		{
			$head[] = $v;
			if (preg_match('/HTTP\/[0-9\.]+\s+([0-9]+)/', $v, $out))
				$head['reponse_code'] = intval($out[1]);
		}
	}
	return $head;
}

try
{
	header('Allow: POST');
	header('Content-Type: application/json');
	header('Accept: application/json;application/x-www-form-urlencoded');

	if ($_SERVER['REQUEST_METHOD'] != 'POST')
		throw new HttpException(405);

	if (!isset($_SERVER['CONTENT_TYPE']))
		throw new HttpException(400, "Missing HTTP 'Content-Type' header.");
	elseif (!isset($_SERVER['HTTP_X_GITHUB_EVENT']))
		throw new HttpException(400, "Missing HTTP 'X-Github-Event' header.");

	if ($_SERVER['HTTP_X_GITHUB_EVENT'] == 'ping')
		new HttpResponse(200);
	else
	{
		$algo = strtok($_SERVER['HTTP_X_HUB_SIGNATURE'], '=');
		$signature = strtok('=');

		if ($signature === false)
			throw new HttpException(400, 'signature has invalid format');

		if (!isset($_SERVER['HTTP_X_HUB_SIGNATURE']))
			throw new HttpException(400, "HTTP header 'X-Hub-Signature' is missing.");
		elseif (!extension_loaded('hash'))
			throw new HttpException(400, "Missing 'hash' extension to check the secret code validity.");

		if (!in_array($algo, hash_algos(), true))
			throw new HttpException(400, "Hash algorithm '$algo' is not supported.");

		$raw_post = file_get_contents('php://input');
		if (!hash_equals($signature, hash_hmac($algo, $raw_post, '110eccfe5a43afec70e99fa1c91889c408ecc7b7')))
			throw new HttpException(400, 'Hook secret does not match.');

		switch ($_SERVER['CONTENT_TYPE'])
		{
			case 'application/json':
				$json = $raw_post ?: file_get_contents('php://input');
				break;

			case 'application/x-www-form-urlencoded':
				$json = $_POST['payload'];
				break;

			default:
				throw new HttpException(406, "Unsupported content type: $_SERVER[CONTENT_TYPE]");
		}

		# Payload structure depends on triggered event
		# https://developer.github.com/v3/activity/events/types/
		$payload = json_decode($json);

		require_once './SSI.php';
		require_once $sourcedir . '/Subs-Post.php';
		$request = $smcFunc['db_query']('', '
		SELECT t.id_topic, t.id_board, m.subject
		FROM {db_prefix}topics AS t
		LEFT JOIN {db_prefix}messages AS m ON (t.id_last_msg = m.id_msg)
		WHERE t.id_topic = 61');
		$repo = $smcFunc['db_fetch_assoc']($request);

		$stream = stream_context_create(array('http' => array('user_agent' => 'Wedge')));
		$repo_url = $payload->repository->full_name;
		$topic_ids = array();
		$body = array();
		foreach ($payload->commits as $commit)
		{
			$item = file_get_contents('https://api.github.com/repos/' . $repo_url . '/commits/' . $commit->id, false, $stream);
			if ($item === false)
				continue;

			print_r(parse_headers($http_response_header));

			$item = json_decode($item);
			$signed_off = strpos($commit->message, "Signed-off-by: ") !== false;

			// A lovely series of regex to turn the ugly changelog layout into Audrey Hepburn.
			// In order: Fix, Comment, Addition, Deletion, Modification.
			$log = '[list]' . str_replace(
				array('[cli=!', '[cli=@', '[cli=+', '[cli=-', '[cli=*', '[/cli]\n\n[cli'),
				array('[cli=f', '[cli=c', '[cli=a', '[cli=r', '[cli=m', '[/cli]\n[cli'),
				preg_replace(
					array(
						'~^([*+@!-]) ([^\v]+)*~m',
						'~^([^\v[].*+)$~m',
					),
					array(
						'[cli=$1]$2[/cli]',
						'[li]$1[/li]',
					),
					preg_replace('~\n\nSigned-off-by: [^\v]+~', '', $item->commit->message)
				)
			) . '[/list]';

			$body[] = "[Commit revision " . substr($item->sha, 0, 7) . "][table]\n[tr]\n[td]\n[img height=50]" . $item->author->avatar_url . "[/img][size=10pt]"
				. "[b]Author[/b]: [url=" . $item->author->html_url . "]" . $item->author->login . "[/url]" . ($signed_off ? " (Signed-off)" : "") . "\n"
				. "[b]Date[/b]: " . date('r', strtotime($item->commit->author->date)) . "\n"
				. "[b]Stats[/b]: [url=https://github.com/" . $repo_url . "/commit/" . $item->sha . "]" . count($item->files)
				. " file" . (count($item->files) > 1 ? 's' : '') . " changed[/url]; +" . $item->stats->additions
				. " (insertion" . ($item->stats->additions > 1 ? "s" : "") . "), -" . $item->stats->deletions
				. " (deletion" . ($item->stats->deletions > 1 ? "s" : "") . ")[/size][/td]\n[/tr]\n[/table]\n"
				. preg_replace('~\n\nSigned-off-by: [^\v]+~', '', $log) . "\n";
		}

		$msgOptions = array(
			'subject' => $repo['subject'],
			'body' => implode($body, "[hr]\n"),
			'icon' => 'xx',
			'smileys_enabled' => 1,
		);
		$topicOptions = array(
			'id' => $repo['id_topic'],
			'board' => $repo['id_board'],
		);
		$posterOptions = array(
			'id' => 1,
			'update_post_count' => true,
		);

		createPost($msgOptions, $topicOptions, $posterOptions);
	}
}
catch (JsonException $exception)
{
	new HttpResponse(400, null, null, ['errors' => ['code' => 400, 'message' => $exception->getMessage()]]);
}
catch (HttpException $exception)
{
	new HttpResponse($exception->getCode(), null, null, ['errors' => ['code' => $exception->getCode(), 'message' => $exception->getMessage()]]);
}