mirror of
https://github.com/yhirose/cpp-httplib
synced 2024-11-21 14:29:10 -07:00
429 lines
9.8 KiB
C++
429 lines
9.8 KiB
C++
//
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// httpsvrkit.h
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//
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// Copyright (c) 2012 Yuji Hirose. All rights reserved.
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// The Boost Software License 1.0
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//
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#ifndef HTTPSVRKIT_H
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#define HTTPSVRKIT_H
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#ifdef _WIN32
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//#define _CRT_SECURE_NO_WARNINGS
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#define _CRT_NONSTDC_NO_DEPRECATE
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#ifndef SO_SYNCHRONOUS_NONALERT
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#define SO_SYNCHRONOUS_NONALERT 0x20;
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#endif
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#ifndef SO_OPENTYPE
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#define SO_OPENTYPE 0x7008
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#endif
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#include <fcntl.h>
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#include <io.h>
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#include <winsock2.h>
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typedef SOCKET socket_t;
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#else
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#include <pthread.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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typedef int socket_t;
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#endif
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#include <functional>
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#include <map>
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#include <regex>
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#include <string>
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#include <assert.h>
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namespace httpsvrkit
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{
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typedef std::map<std::string, std::string> Map;
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typedef std::vector<std::string> Array;
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typedef std::multimap<std::string, std::string> MultiMap;
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// HTTP request
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struct Request {
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std::string method;
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std::string url;
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Map headers;
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std::string body;
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Map query;
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Array params;
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};
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// HTTP response
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struct Response {
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int status;
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MultiMap headers;
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std::string body;
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void set_redirect(const char* url);
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void set_content(const std::string& s, const char* content_type = "text/plain");
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};
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struct Context {
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Request request;
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Response response;
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};
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// HTTP server
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class Server {
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public:
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typedef std::function<void (Context& context)> Handler;
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Server(const char* ipaddr_or_hostname, int port);
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~Server();
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void get(const char* pattern, Handler handler);
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void post(const char* pattern, Handler handler);
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bool run();
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void stop();
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private:
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void process_request(FILE* fp_read, FILE* fp_write);
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const std::string ipaddr_or_hostname_;
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const int port_;
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socket_t sock_;
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std::vector<std::pair<std::regex, Handler>> get_handlers_;
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std::vector<std::pair<std::string, Handler>> post_handlers_;
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};
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// Implementation
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template <class Fn>
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void split(const char* b, const char* e, char d, Fn fn)
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{
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int i = 0;
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int beg = 0;
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while (e ? (b + i != e) : (b[i] != '\0')) {
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if (b[i] == d) {
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fn(&b[beg], &b[i]);
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beg = i + 1;
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}
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i++;
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}
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if (i != 0) {
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fn(&b[beg], &b[i]);
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}
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}
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inline socket_t create_server_socket(const char* ipaddr_or_hostname, int port)
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{
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#ifdef _WIN32
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int opt = SO_SYNCHRONOUS_NONALERT;
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setsockopt(INVALID_SOCKET, SOL_SOCKET, SO_OPENTYPE, (char*)&opt, sizeof(opt));
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#endif
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// Create a server socket
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socket_t sock = socket(AF_INET, SOCK_STREAM, 0);
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if (sock == -1) {
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return -1;
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}
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// Make 'reuse address' option available
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int yes = 1;
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setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)&yes, sizeof(yes));
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// Get a host entry info
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struct hostent* hp;
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if (!(hp = gethostbyname(ipaddr_or_hostname))) {
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return -1;
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}
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// Bind the socket to the given address
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struct sockaddr_in addr;
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memset(&addr, 0, sizeof(addr));
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memcpy(&addr.sin_addr, hp->h_addr, hp->h_length);
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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if (::bind(sock, (struct sockaddr*)&addr, sizeof(addr)) != 0) {
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return -1;
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}
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// Listen through 5 channels
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if (listen(sock, 5) != 0) {
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return -1;
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}
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return sock;
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}
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inline void close_socket(socket_t sock)
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{
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#ifdef _WIN32
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closesocket(sock);
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#else
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shutdown(sock, SHUT_RDWR);
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close(sock);
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#endif
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}
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void Response::set_redirect(const char* url)
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{
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headers.insert(std::make_pair("Location", url));
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status = 302;
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}
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void Response::set_content(const std::string& s, const char* content_type)
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{
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body = s;
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headers.insert(std::make_pair("Content-Type", content_type));
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status = 200;
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}
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inline Server::Server(const char* ipaddr_or_hostname, int port)
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: ipaddr_or_hostname_(ipaddr_or_hostname)
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, port_(port)
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, sock_(-1)
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{
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#ifdef _WIN32
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WSADATA wsaData;
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WSAStartup(0x0002, &wsaData);
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#endif
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}
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inline Server::~Server()
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{
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#ifdef _WIN32
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WSACleanup();
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#endif
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}
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inline void Server::get(const char* pattern, Handler handler)
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{
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get_handlers_.push_back(std::make_pair(pattern, handler));
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}
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inline void Server::post(const char* pattern, Handler handler)
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{
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post_handlers_.push_back(std::make_pair(pattern, handler));
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}
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inline bool Server::run()
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{
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sock_ = create_server_socket(ipaddr_or_hostname_.c_str(), port_);
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if (sock_ == -1) {
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return false;
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}
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for (;;) {
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socket_t fd = accept(sock_, NULL, NULL);
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if (fd == -1) {
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// The server socket was closed by user.
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if (sock_ == -1) {
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return true;
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}
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close_socket(sock_);
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return false;
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}
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#ifdef _WIN32
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int osfhandle = _open_osfhandle(fd, _O_RDONLY);
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FILE* fp_read = fdopen(osfhandle, "rb");
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FILE* fp_write = fdopen(osfhandle, "wb");
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#else
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FILE* fp_read = fdopen(fd, "rb");
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FILE* fp_write = fdopen(fd, "wb");
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#endif
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process_request(fp_read, fp_write);
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fflush(fp_write);
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close_socket(fd);
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}
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// NOTREACHED
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}
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inline void Server::stop()
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{
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close_socket(sock_);
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sock_ = -1;
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}
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inline bool read_request_line(FILE* fp, Request& request)
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{
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static std::regex re("(GET|POST) ([^?]+)(?:\\?(.+?))? HTTP/1\\.1\r\n");
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const size_t BUFSIZ_REQUESTLINE = 2048;
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char buf[BUFSIZ_REQUESTLINE];
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fgets(buf, BUFSIZ_REQUESTLINE, fp);
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std::cmatch m;
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if (std::regex_match(buf, m, re)) {
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request.method = std::string(m[1]);
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request.url = std::string(m[2]);
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// Parse query text
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auto len = std::distance(m[3].first, m[3].second);
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if (len > 0) {
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const auto& pos = m[3];
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split(pos.first, pos.second, '&', [&](const char* b, const char* e) {
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std::string key;
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std::string val;
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split(b, e, '=', [&](const char* b, const char* e) {
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if (key.empty()) {
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key.assign(b, e);
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} else {
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val.assign(b, e);
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}
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});
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request.query[key] = val;
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});
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}
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return true;
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}
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return false;
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}
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inline void read_headers(FILE* fp, Map& headers)
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{
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static std::regex re("(.+?): (.+?)\r\n");
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const size_t BUFSIZ_HEADER = 2048;
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char buf[BUFSIZ_HEADER];
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while (fgets(buf, BUFSIZ_HEADER, fp) && strcmp(buf, "\r\n")) {
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std::cmatch m;
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if (std::regex_match(buf, m, re)) {
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auto key = std::string(m[1]);
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auto val = std::string(m[2]);
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headers[key] = val;
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}
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}
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}
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inline const char* get_header_value(const MultiMap& map, const char* key, const char* def)
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{
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auto it = map.find(key);
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if (it != map.end()) {
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return it->second.c_str();
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}
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return def;
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}
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inline void write_response(FILE* fp, const Response& response)
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{
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fprintf(fp, "HTTP/1.0 %d OK\r\n", response.status);
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fprintf(fp, "Connection: close\r\n");
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for (auto it = response.headers.begin(); it != response.headers.end(); ++it) {
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if (it->first != "Content-Type" && it->second != "Content-Length") {
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fprintf(fp, "%s: %s\r\n", it->first.c_str(), it->second.c_str());
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}
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}
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if (!response.body.empty()) {
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auto content_type = get_header_value(response.headers, "Content-Type", "text/plain");
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fprintf(fp, "Content-Type: %s\r\n", content_type);
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fprintf(fp, "Content-Length: %ld\r\n", response.body.size());
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}
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fprintf(fp, "\r\n");
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if (!response.body.empty()) {
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fprintf(fp, "%s", response.body.c_str());
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}
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}
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inline void write_error(FILE* fp, int status)
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{
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const char* msg = NULL;
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switch (status) {
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case 400:
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msg = "Bad Request";
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break;
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case 404:
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msg = "Not Found";
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break;
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default:
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status = 500;
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msg = "Internal Server Error";
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break;
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}
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assert(msg);
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fprintf(fp, "HTTP/1.0 %d %s\r\n", status, msg);
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fprintf(fp, "Content-type: text/plain\r\n");
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fprintf(fp, "Connection: close\r\n");
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fprintf(fp, "\r\n");
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fprintf(fp, "Status: %d\r\n", status);
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}
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inline void Server::process_request(FILE* fp_read, FILE* fp_write)
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{
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Context cxt;
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// Read and parse request line
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if (!read_request_line(fp_read, cxt.request)) {
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write_error(fp_write, 400);
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return;
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}
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// Read headers
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read_headers(fp_read, cxt.request.headers);
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// Routing
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cxt.response.status = 404;
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if (cxt.request.method == "GET") {
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for (auto it = get_handlers_.begin(); it != get_handlers_.end(); ++it) {
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const auto& pattern = it->first;
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const auto& handler = it->second;
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std::smatch m;
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if (std::regex_match(cxt.request.url, m, pattern)) {
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for (size_t i = 1; i < m.size(); i++) {
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cxt.request.params.push_back(m[i]);
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}
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handler(cxt);
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break;
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}
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}
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} else if (cxt.request.method == "POST") {
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// TODO: parse body
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} else {
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cxt.response.status = 400;
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}
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if (200 <= cxt.response.status && cxt.response.status < 400) {
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write_response(fp_write, cxt.response);
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} else {
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write_error(fp_write, cxt.response.status);
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}
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}
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#define HTTP_SERVER(host, port) \
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for (std::shared_ptr<httpsvrkit::Server> svr = std::make_shared<httpsvrkit::Server>(host, port); \
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svr; \
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svr->run(), svr.reset())
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#define GET(url, body) \
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svr->get(url, [&](httpsvrkit::Context& cxt) { \
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const auto& req = cxt.request; \
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auto& res = cxt.response; \
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body \
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});
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} // namespace httpsvrkit
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#endif
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// vim: et ts=4 sw=4 cin cino={1s ff=unix
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