Created
October 19, 2023 18:09
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Simple PHP based web-hook multiplexer / relay service
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| <?php | |
| // A map of "request_path" => Array of target urls. | |
| // Any request coming to "request_path" will be forwarded/relayed to all the urls specified in its value | |
| // fowarding is done asynchronously and concurrntly. | |
| $conf = [ | |
| '/mywebook1' => [ | |
| 'https://testing.myapp.local/webhook/webhook1', | |
| 'https://dev.myapp.local/webhook/webhook1', | |
| ], | |
| '/mywebook2' => [ | |
| 'https://testing.myapp.local/hooks/hook2', | |
| 'https://dev.monitoring.local/webhooklogger/hook2', | |
| ], | |
| ]; | |
| require_once(__DIR__ . '/../vendor/autoload.php'); | |
| use GuzzleHttp\Client; | |
| use GuzzleHttp\Promise; | |
| /** | |
| * | |
| * @property Array $relayConf | |
| */ | |
| class WebhookRelay | |
| { | |
| public function __construct($relayConf) | |
| { | |
| $this->relayConf = $relayConf; | |
| } | |
| function sendReq($url, $method = "GET", $query = [], $body = "", $headers = []) | |
| { | |
| return (new Client())->requestAsync($method, $url, [ | |
| 'query' => $query, | |
| 'body' => $body, | |
| 'headers' => $headers, | |
| ]); | |
| } | |
| function relayReq($path) | |
| { | |
| $relayConf = $this->relayConf; | |
| if (!isset($relayConf[$path])) { | |
| error_log("webhook: no urls found for " . $path); | |
| return; | |
| } | |
| $headers = getallheaders(); | |
| unset($headers['Host']); | |
| unset($headers['Accept-Encoding']); | |
| $query = $_GET; | |
| $method = $_SERVER['REQUEST_METHOD']; | |
| $body = file_get_contents('php://input'); | |
| $urls = $relayConf[$path]; | |
| $allTasks = []; | |
| foreach ($urls as $url) { | |
| $allTasks[] = $this->sendReq($url, $method, $query, $body, $headers); | |
| } | |
| return Promise\Utils::unwrap($allTasks); | |
| } | |
| } | |
| // First send response to upstream server | |
| ob_start(); | |
| echo json_encode(['success' => true]); | |
| $size = ob_get_length(); | |
| header('Content-type: application/json'); | |
| header("Content-Length: {$size}"); | |
| header("Connection: close"); | |
| ob_end_flush(); | |
| ob_flush(); | |
| flush(); | |
| // Then do the processing | |
| $path = $_SERVER['PATH_INFO']; | |
| $path = rtrim($path, '/'); | |
| $webhookRelay = new WebhookRelay($conf); | |
| $webhookRelay->relayReq($path); |
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