<?php

namespace Composer\Util\Http;

/**
 * Proxy discovery and helper class
 *
 * @internal
 * @author John Stevenson <john-stevenson@blueyonder.co.uk>
 */
class ProxyHelper
{
	/**
	 * Returns proxy environment values
	 *
	 * @return array{string|null, string|null, string|null} httpProxy, httpsProxy, noProxy values
	 *
	 * @throws \RuntimeException on malformed url
	 */
	public static function getProxyData(): array
	{
		$httpProxy = null;
		$httpsProxy = null;

		// Handle http_proxy/HTTP_PROXY on CLI only for security reasons
		if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {
		    if ($env = self::getProxyEnv(['http_proxy', 'HTTP_PROXY'], $name)) {
		        $httpProxy = self::checkProxy($env, $name);
		    }
		}

		// Prefer CGI_HTTP_PROXY if available
		if ($env = self::getProxyEnv(['CGI_HTTP_PROXY'], $name)) {
		    $httpProxy = self::checkProxy($env, $name);
		}

		// Handle https_proxy/HTTPS_PROXY
		if ($env = self::getProxyEnv(['https_proxy', 'HTTPS_PROXY'], $name)) {
		    $httpsProxy = self::checkProxy($env, $name);
		} else {
		    $httpsProxy = $httpProxy;
		}

		// Handle no_proxy
		$noProxy = self::getProxyEnv(['no_proxy', 'NO_PROXY'], $name);

		return [$httpProxy, $httpsProxy, $noProxy];
	}


	/**
	 * Returns http context options for the proxy url
	 *
	 * @return array{http: array{proxy: string, header?: string}}
	 */
	public static function getContextOptions(string $proxyUrl): array
	{
		$proxy = parse_url($proxyUrl);

		// Remove any authorization
		$proxyUrl = self::formatParsedUrl($proxy, false);
		$proxyUrl = str_replace(['http://', 'https://'], ['tcp://', 'ssl://'], $proxyUrl);

		$options['http']['proxy'] = $proxyUrl;

		// Handle any authorization
		if (isset($proxy['user'])) {
		    $auth = rawurldecode($proxy['user']);

		    if (isset($proxy['pass'])) {
		        $auth .= ':' . rawurldecode($proxy['pass']);
		    }
		    $auth = base64_encode($auth);
		    // Set header as a string
		    $options['http']['header'] = "Proxy-Authorization: Basic {$auth}";
		}

		return $options;
	}


	/**
	 * Sets/unsets request_fulluri value in http context options array
	 *
	 * @param mixed[] $options Set by method
	 */
	public static function setRequestFullUri(string $requestUrl, array &$options): void
	{
		if ('http' === parse_url($requestUrl, PHP_URL_SCHEME)) {
		    $options['http']['request_fulluri'] = true;
		} else {
		    unset($options['http']['request_fulluri']);
		}
	}


	/**
	 * Searches $_SERVER for case-sensitive values
	 *
	 * @param string[]    $names Names to search for
	 * @param string|null $name  Name of any found value
	 *
	 * @return string|null The found value
	 */
	private static function getProxyEnv(array $names, ?string &$name): ?string
	{
		foreach ($names as $name) {
		    if (!empty($_SERVER[$name])) {
		        return $_SERVER[$name];
		    }
		}

		return null;
	}


	/**
	 * Checks and formats a proxy url from the environment
	 *
	 * @throws \RuntimeException on malformed url
	 * @return string            The formatted proxy url
	 */
	private static function checkProxy(string $proxyUrl, string $envName): string
	{
		$error = sprintf('malformed %s url', $envName);
		$proxy = parse_url($proxyUrl);

		// We need parse_url to have identified a host
		if (!isset($proxy['host'])) {
		    throw new \RuntimeException($error);
		}

		$proxyUrl = self::formatParsedUrl($proxy, true);

		// We need a port because streams and curl use different defaults
		if (!parse_url($proxyUrl, PHP_URL_PORT)) {
		    throw new \RuntimeException($error);
		}

		return $proxyUrl;
	}


	/**
	 * Formats a url from its component parts
	 *
	 * @param  array{scheme?: string, host: string, port?: int, user?: string, pass?: string} $proxy
	 *
	 * @return string The formatted value
	 */
	private static function formatParsedUrl(array $proxy, bool $includeAuth): string
	{
		$proxyUrl = isset($proxy['scheme']) ? strtolower($proxy['scheme']) . '://' : '';

		if ($includeAuth && isset($proxy['user'])) {
		    $proxyUrl .= $proxy['user'];

		    if (isset($proxy['pass'])) {
		        $proxyUrl .= ':' . $proxy['pass'];
		    }
		    $proxyUrl .= '@';
		}

		$proxyUrl .= $proxy['host'];

		if (isset($proxy['port'])) {
		    $proxyUrl .= ':' . $proxy['port'];
		} elseif (strpos($proxyUrl, 'http://') === 0) {
		    $proxyUrl .= ':80';
		} elseif (strpos($proxyUrl, 'https://') === 0) {
		    $proxyUrl .= ':443';
		}

		return $proxyUrl;
	}
}
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