php
<?php
class web_config {
 // 监听的端口号
 const PORT = 9003;
 // 项目根目录
 const WEB_ROOT = "/Users/zhoumengkang/Documents/html";
 // 系统支持的 cgi 程序的文件扩展名
 const CGI_EXTENSION = "cgi";
}
class server {
 private $ip;
 private $port;
 public function __construct($ip, $port) {
 $this->ip = $ip;
 $this->port = $port;
 $this->await();
 }
 private function await() {
 $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
 if ($sock < 0) {
 echo "Error:" . socket_strerror(socket_last_error()) . "\n";
 }
 $ret = socket_bind($sock, $this->ip, $this->port);
 if (!$ret) {
 echo "BIND FAILED:" . socket_strerror(socket_last_error()) . "\n";
 exit;
 }
 echo "OK\n";
 $ret = socket_listen($sock);
 if ($ret < 0) {
 echo "LISTEN FAILED:" . socket_strerror(socket_last_error()) . "\n";
 }
 do {
 $new_sock = null;
 try {
 $new_sock = socket_accept($sock);
 } catch (Exception $e) {
 echo $e->getMessage();
 echo "ACCEPT FAILED:" . socket_strerror(socket_last_error()) . "\n";
 }
 try {
 $request_string = socket_read($new_sock, 1024);
 $response = $this->output($request_string);
 socket_write($new_sock, $response);
 socket_close($new_sock);
 } catch (Exception $e) {
 echo $e->getMessage();
 echo "READ FAILED:" . socket_strerror(socket_last_error()) . "\n";
 }
 } while (TRUE);
 }
 /**
 * @param $request_string
 * @return string
 */
 private function output($request_string){
 // 静态 GET /1.html HTTP/1.1 ...
 // 动态 GET /user.cgi?id=1 HTTP/1.1 ...
 $request_array = explode(" ",$request_string);
 if(count($request_array) < 2){
 return "";
 }
 $uri = $request_array[1];
 echo "request:".web_config::WEB_ROOT . $uri."\n";
 $query_string = null;
 if ($uri == "/favicon.ico") {
 return "";
 }
 if (strpos($uri,"?")) {
 $uriArr = explode("?", $uri);
 $uri = $uriArr[0];
 $query_string = isset($uriArr[1]) ? $uriArr[1] : null;
 }
 $filename = web_config::WEB_ROOT . $uri;
 if ($this->cgi_check($uri)) {
 $this->set_env($query_string);
 $handle = popen(web_config::WEB_ROOT.$uri, "r");
 $read = stream_get_contents($handle);
 pclose($handle);
 return $this->add_header($read);
 }
 // 静态文件的处理
 if (file_exists($filename)) {
 return $this->add_header(file_get_contents($filename));
 } else {
 return $this->not_found();
 }
 }
 /**
 * 设置环境变量 给 cgi 程序使用
 * @param $query_string
 * @return bool
 */
 private function set_env($query_string){
 if($query_string == null){
 return false;
 }
 if (strpos($query_string, "=")) {
 putenv("QUERY_STRING=".$query_string);
 }
 }
 /**
 * 判断请求的 uri 是否是合法的 cgi 资源
 * @param $uri
 * @return bool
 */
 private function cgi_check($uri){
 $info = pathinfo($uri);
 $extension = isset($info["extension"]) ? $info["extension"] : null;
 if( $extension && in_array($extension,explode(",",web_config::CGI_EXTENSION))){
 return true;
 }
 return false;
 }
 /**
 * 404 返回
 * @return string
 */
 private function not_found(){
 $content = "<h1>File Not Found </h1>";
 return "HTTP/1.1 404 File Not Found\r\nContent-Type: text/html\r\nContent-Length: ".strlen($content)."\r\n\r\n".$content;
 }
 /**
 * 加上头信息
 * @param $string
 * @return string
 */
 private function add_header($string){
 return "HTTP/1.1 200 OK\r\nContent-Length: ".strlen($string)."\r\nServer: mengkang\r\n\r\n".$string;
 }
}
$server = new server("127.0.0.1", web_config::PORT);