php echo server (with gzip support)

php-echo.php

<?php
// php -S 127.1:8090 -t .

function log_request(array $body = [])
{
    // guess body
    if (count($body) === 0) {
        if ($_POST) {
            $body = $_POST;
        }

        $json = file_get_contents("php://input");
        $json = json_decode($json, true);

        if ($json) {
            $body = $json;
        }
    }

    $headers = getallheaders();
    $http_method = $_SERVER["REQUEST_METHOD"];
    $request_uri = $_SERVER["REQUEST_URI"];

    $now = date("Y-m-d H:i:s");
    $lines = join("\n\n", [
        sprintf("[%s] %s %s", $now, $http_method, $request_uri),
        json_encode($headers, JSON_PRETTY_PRINT),
        json_encode($body, JSON_PRETTY_PRINT),
        "----------------------------------------------------------------------\n\n",
    ]);
    file_put_contents("/tmp/x-request-log.text", $lines, FILE_APPEND);
}

function has_compressed_request_body()
{
    // expected header when compressed: "Content-Encoding": "gzip",
    return array_key_exists("Content-Encoding", getallheaders()) &&
        getallheaders()["Content-Encoding"];
}

function get_request_body()
{
    if (has_compressed_request_body()) {
        return gzdecode(file_get_contents("php://input"));
    }

    return file_get_contents("php://input");
}

function buildBigQResponseOk(array $messages)
{
    $results = [];

    foreach ($messages as $message) {
        array_push($results, [
            "data" => $message["msg"],
            "status_code" => 500,
        ]);
    }

    return [
        "status_code" => 207,
        "results" => $results,
    ];
}

// Boostraping
// ===============

$request_body = get_request_body();

log_request(json_decode($request_body, true));

$response = buildBigQResponseOk(json_decode($request_body, true)["msgs"]);

header("Content-type: application/json");

echo json_encode($response);

exit(0);