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+// license:MIT
+// copyright-holders:Ole Christian Eidheim, Miodrag Milanovic
+#ifndef SERVER_HTTP_HPP
+#define SERVER_HTTP_HPP
+
+#if defined(_MSC_VER)
+#pragma warning(disable:4503)
+#endif
+
+#include "asio.h"
+#include "asio/system_timer.hpp"
+#include "path_to_regex.hpp"
+
+#include <map>
+#include <unordered_map>
+#include <thread>
+#include <functional>
+#include <iostream>
+#include <sstream>
+#include <regex>
+
+#ifndef CASE_INSENSITIVE_EQUALS_AND_HASH
+#define CASE_INSENSITIVE_EQUALS_AND_HASH
+class case_insensitive_equals {
+public:
+ bool operator()(const std::string &key1, const std::string &key2) const {
+ return key1.size() == key2.size()
+ && equal(key1.cbegin(), key1.cend(), key2.cbegin(),
+ [](std::string::value_type key1v, std::string::value_type key2v)
+ { return tolower(key1v) == tolower(key2v); });
+ }
+};
+class case_insensitive_hash {
+public:
+ size_t operator()(const std::string &key) const {
+ size_t seed = 0;
+ for (auto &c : key) {
+ std::hash<char> hasher;
+ seed ^= hasher(std::tolower(c)) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+ }
+ return seed;
+ }
+};
+#endif
+namespace webpp {
+ template <class socket_type>
+ class Server;
+
+ template <class socket_type>
+ class ServerBase {
+ public:
+ virtual ~ServerBase() {}
+
+ class Response {
+ friend class ServerBase<socket_type>;
+
+ asio::streambuf m_streambuf;
+
+ std::shared_ptr<socket_type> m_socket;
+ std::ostream m_ostream;
+ std::stringstream m_header;
+ explicit Response(const std::shared_ptr<socket_type> &socket) : m_socket(socket), m_ostream(&m_streambuf) {}
+
+ static std::string statusToString(int status)
+ {
+ switch (status) {
+ default:
+ case 200: return "HTTP/1.0 200 OK\r\n";
+ case 201: return "HTTP/1.0 201 Created\r\n";
+ case 202: return "HTTP/1.0 202 Accepted\r\n";
+ case 204: return "HTTP/1.0 204 No Content\r\n";
+ case 300: return "HTTP/1.0 300 Multiple Choices\r\n";
+ case 301: return "HTTP/1.0 301 Moved Permanently\r\n";
+ case 302: return "HTTP/1.0 302 Moved Temporarily\r\n";
+ case 304: return "HTTP/1.0 304 Not Modified\r\n";
+ case 400: return "HTTP/1.0 400 Bad Request\r\n";
+ case 401: return "HTTP/1.0 401 Unauthorized\r\n";
+ case 403: return "HTTP/1.0 403 Forbidden\r\n";
+ case 404: return "HTTP/1.0 404 Not Found\r\n";
+ case 500: return "HTTP/1.0 500 Internal Server Error\r\n";
+ case 501: return "HTTP/1.0 501 Not Implemented\r\n";
+ case 502: return "HTTP/1.0 502 Bad Gateway\r\n";
+ case 504: return "HTTP/1.0 503 Service Unavailable\r\n";
+ }
+ }
+ public:
+ Response& status(int number) { m_ostream << statusToString(number); return *this; }
+ void type(std::string str) { m_header << "Content-Type: "<< str << "\r\n"; }
+ void send(std::string str) { m_ostream << m_header.str() << "Content-Length: " << str.length() << "\r\n\r\n" << str; }
+ size_t size() const { return m_streambuf.size(); }
+ std::shared_ptr<socket_type> socket() { return m_socket; }
+ };
+
+ class Content : public std::istream {
+ friend class ServerBase<socket_type>;
+ public:
+ size_t size() const {
+ return streambuf.size();
+ }
+ std::string string() const {
+ std::stringstream ss;
+ ss << rdbuf();
+ return ss.str();
+ }
+ private:
+ asio::streambuf &streambuf;
+ explicit Content(asio::streambuf &streambuf): std::istream(&streambuf), streambuf(streambuf) {}
+ };
+
+ class Request {
+ friend class ServerBase<socket_type>;
+ friend class Server<socket_type>;
+ public:
+ std::string method, path, http_version;
+
+ Content content;
+
+ std::unordered_multimap<std::string, std::string, case_insensitive_hash, case_insensitive_equals> header;
+
+ path2regex::Keys keys;
+ std::map<std::string, std::string> params;
+
+ std::string remote_endpoint_address;
+ unsigned short remote_endpoint_port;
+
+ private:
+ Request(const socket_type &socket): content(streambuf) {
+ try {
+ remote_endpoint_address=socket.lowest_layer().remote_endpoint().address().to_string();
+ remote_endpoint_port=socket.lowest_layer().remote_endpoint().port();
+ }
+ catch(...) {}
+ }
+ asio::streambuf streambuf;
+ };
+
+ class Config {
+ friend class ServerBase<socket_type>;
+
+ Config(unsigned short port) : port(port) {}
+ public:
+ /// Port number to use. Defaults to 80 for HTTP and 443 for HTTPS.
+ unsigned short port;
+ /// Number of threads that the server will use when start() is called. Defaults to 1 thread.
+ size_t thread_pool_size=1;
+ /// Timeout on request handling. Defaults to 5 seconds.
+ size_t timeout_request=5;
+ /// Timeout on content handling. Defaults to 300 seconds.
+ size_t timeout_content=300;
+ /// IPv4 address in dotted decimal form or IPv6 address in hexadecimal notation.
+ /// If empty, the address will be any address.
+ std::string address;
+ /// Set to false to avoid binding the socket to an address that is already in use. Defaults to true.
+ bool reuse_address=true;
+ };
+ ///Set before calling start().
+ Config m_config;
+ private:
+ class regex_orderable : public std::regex {
+ std::string str;
+ public:
+ regex_orderable(std::regex reg, const std::string &regex_str) : std::regex(reg), str(regex_str) {}
+ bool operator<(const regex_orderable &rhs) const {
+ return str<rhs.str;
+ }
+ std::string getstr() const { return str; }
+ };
+ using http_handler = std::function<void(std::shared_ptr<Response>, std::shared_ptr<Request>)>;
+
+ public:
+ template<class T> void on_get(std::string regex, T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); path2regex::Keys keys; auto reg = path2regex::path_to_regex(regex, keys); m_resource[regex_orderable(reg,regex)]["GET"] = std::make_tuple(std::move(keys), func); }
+ template<class T> void on_get(T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); m_default_resource["GET"] = func; }
+ template<class T> void on_post(std::string regex, T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); path2regex::Keys keys; auto reg = path2regex::path_to_regex(regex, keys); m_resource[regex_orderable(reg, regex)]["POST"] = std::make_tuple(std::move(keys), func); }
+ template<class T> void on_post(T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); m_default_resource["POST"] = func; }
+ template<class T> void on_put(std::string regex, T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); path2regex::Keys keys; auto reg = path2regex::path_to_regex(regex, keys); m_resource[regex_orderable(reg, regex)]["PUT"] = std::make_tuple(std::move(keys), func); }
+ template<class T> void on_put(T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); m_default_resource["PUT"] = func; }
+ template<class T> void on_patch(std::string regex, T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); path2regex::Keys keys; auto reg = path2regex::path_to_regex(regex, keys); m_resource[regex_orderable(reg, regex)]["PATCH"] = std::make_tuple(std::move(keys), func); }
+ template<class T> void on_patch(T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); m_default_resource["PATCH"] = func; }
+ template<class T> void on_delete(std::string regex, T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); path2regex::Keys keys; auto reg = path2regex::path_to_regex(regex, keys); m_resource[regex_orderable(reg, regex)]["DELETE"] = std::make_tuple(std::move(keys), func); }
+ template<class T> void on_delete(T&& func) { std::lock_guard<std::mutex> lock(m_resource_mutex); m_default_resource["DELETE"] = func; }
+
+ void remove_handler(std::string regex)
+ {
+ std::lock_guard<std::mutex> lock(m_resource_mutex);
+ for (auto &it = m_resource.begin(); it != m_resource.end(); ++it)
+ {
+ if (it->first.getstr() == regex)
+ {
+ m_resource.erase(it);
+ break;
+ }
+ }
+ }
+
+ std::function<void(std::shared_ptr<typename ServerBase<socket_type>::Request>, const std::error_code&)> on_error;
+
+ std::function<void(std::shared_ptr<socket_type> socket, std::shared_ptr<typename ServerBase<socket_type>::Request>)> on_upgrade;
+ private:
+ /// Warning: do not add or remove resources after start() is called
+ std::map<regex_orderable, std::map<std::string, std::tuple<path2regex::Keys, http_handler>>> m_resource;
+
+ std::map<std::string, http_handler> m_default_resource;
+
+ std::mutex m_resource_mutex;
+ public:
+ virtual void start() {
+ if(!m_io_context)
+ m_io_context=std::make_shared<asio::io_context>();
+
+ if(m_io_context->stopped())
+ m_io_context.reset();
+
+ asio::ip::tcp::endpoint endpoint;
+ if(m_config.address.size()>0)
+ endpoint=asio::ip::tcp::endpoint(asio::ip::make_address(m_config.address), m_config.port);
+ else
+ endpoint=asio::ip::tcp::endpoint(asio::ip::tcp::v4(), m_config.port);
+
+ if(!acceptor)
+ acceptor= std::make_unique<asio::ip::tcp::acceptor>(*m_io_context);
+ acceptor->open(endpoint.protocol());
+ acceptor->set_option(asio::socket_base::reuse_address(m_config.reuse_address));
+ acceptor->bind(endpoint);
+ acceptor->listen();
+
+ accept();
+
+ if (!m_external_context)
+ m_io_context->run();
+ }
+
+ void stop() const
+ {
+ acceptor->close();
+ if (!m_external_context)
+ m_io_context->stop();
+ }
+
+ ///Use this function if you need to recursively send parts of a longer message
+ void send(const std::shared_ptr<Response> &response, const std::function<void(const std::error_code&)>& callback=nullptr) const {
+ asio::async_write(*response->socket(), response->m_streambuf, [this, response, callback](const std::error_code& ec, size_t /*bytes_transferred*/) {
+ if(callback)
+ callback(ec);
+ });
+ }
+
+ void set_io_context(std::shared_ptr<asio::io_context> new_io_context)
+ {
+ m_io_context = new_io_context;
+ m_external_context = true;
+ }
+ protected:
+ std::shared_ptr<asio::io_context> m_io_context;
+ bool m_external_context;
+ std::unique_ptr<asio::ip::tcp::acceptor> acceptor;
+ std::vector<std::thread> threads;
+
+ ServerBase(unsigned short port) : m_config(port), m_external_context(false) {}
+
+ virtual void accept()=0;
+
+ std::shared_ptr<asio::system_timer> get_timeout_timer(const std::shared_ptr<socket_type> &socket, long seconds) {
+ if(seconds==0)
+ return nullptr;
+ auto timer = std::make_shared<asio::system_timer>(*m_io_context);
+ timer->expires_at(std::chrono::system_clock::now() + std::chrono::seconds(seconds));
+ timer->async_wait([socket](const std::error_code& ec){
+ if(!ec) {
+ std::error_code newec = ec;
+ socket->lowest_layer().shutdown(asio::ip::tcp::socket::shutdown_both, newec);
+ socket->lowest_layer().close();
+ }
+ });
+ return timer;
+ }
+
+ void read_request_and_content(const std::shared_ptr<socket_type> &socket) {
+ //Create new streambuf (Request::streambuf) for async_read_until()
+ //shared_ptr is used to pass temporary objects to the asynchronous functions
+ std::shared_ptr<Request> request(new Request(*socket));
+
+ //Set timeout on the following asio::async-read or write function
+ auto timer = get_timeout_timer(socket, m_config.timeout_request);
+
+ asio::async_read_until(*socket, request->streambuf, "\r\n\r\n",
+ [this, socket, request, timer](const std::error_code& ec, size_t bytes_transferred) {
+ if(timer)
+ timer->cancel();
+ if(!ec) {
+ //request->streambuf.size() is not necessarily the same as bytes_transferred, from Boost-docs:
+ //"After a successful async_read_until operation, the streambuf may contain additional data beyond the delimiter"
+ //The chosen solution is to extract lines from the stream directly when parsing the header. What is left of the
+ //streambuf (maybe some bytes of the content) is appended to in the async_read-function below (for retrieving content).
+ size_t num_additional_bytes=request->streambuf.size()-bytes_transferred;
+
+ if (!parse_request(request))
+ return;
+
+ //If content, read that as well
+ auto it = request->header.find("Content-Length");
+ if (it != request->header.end()) {
+ unsigned long long content_length;
+ try {
+ content_length = stoull(it->second);
+ }
+ catch (const std::exception &) {
+ if (on_error)
+ on_error(request, std::error_code(EPROTO, std::generic_category()));
+ return;
+ }
+ if (content_length > num_additional_bytes) {
+ //Set timeout on the following asio::async-read or write function
+ auto timer2 = get_timeout_timer(socket, m_config.timeout_content);
+ asio::async_read(*socket, request->streambuf,
+ asio::transfer_exactly(size_t(content_length) - num_additional_bytes),
+ [this, socket, request, timer2]
+ (const std::error_code& ec, size_t /*bytes_transferred*/) {
+ if (timer2)
+ timer2->cancel();
+ if (!ec)
+ find_resource(socket, request);
+ else if (on_error)
+ on_error(request, ec);
+ });
+ }
+ else {
+ find_resource(socket, request);
+ }
+ }
+ else {
+ find_resource(socket, request);
+ }
+ }
+ else if (on_error)
+ on_error(request, ec);
+ });
+ }
+
+ bool parse_request(const std::shared_ptr<Request> &request) const {
+ std::string line;
+ getline(request->content, line);
+ size_t method_end;
+ if((method_end=line.find(' '))!=std::string::npos) {
+ size_t path_end;
+ if((path_end=line.find(' ', method_end+1))!=std::string::npos) {
+ request->method=line.substr(0, method_end);
+ request->path=line.substr(method_end+1, path_end-method_end-1);
+
+ size_t protocol_end;
+ if((protocol_end=line.find('/', path_end+1))!=std::string::npos) {
+ if(line.compare(path_end+1, protocol_end-path_end-1, "HTTP")!=0)
+ return false;
+ request->http_version=line.substr(protocol_end+1, line.size()-protocol_end-2);
+ }
+ else
+ return false;
+
+ getline(request->content, line);
+ size_t param_end;
+ while((param_end=line.find(':'))!=std::string::npos) {
+ size_t value_start=param_end+1;
+ if((value_start)<line.size()) {
+ if(line[value_start]==' ')
+ value_start++;
+ if(value_start<line.size())
+ request->header.emplace(line.substr(0, param_end), line.substr(value_start, line.size() - value_start - 1));
+ }
+
+ getline(request->content, line);
+ }
+ }
+ else
+ return false;
+ }
+ else
+ return false;
+ return true;
+ }
+
+ void find_resource(const std::shared_ptr<socket_type> &socket, const std::shared_ptr<Request> &request) {
+ std::lock_guard<std::mutex> lock(m_resource_mutex);
+ //Upgrade connection
+ if(on_upgrade) {
+ auto it=request->header.find("Upgrade");
+ if(it!=request->header.end()) {
+ on_upgrade(socket, request);
+ return;
+ }
+ }
+ //Find path- and method-match, and call write_response
+ for(auto& regex_method : m_resource) {
+ auto it = regex_method.second.find(request->method);
+ if (it != regex_method.second.end()) {
+ std::smatch sm_res;
+ if (std::regex_match(request->path, sm_res, regex_method.first)) {
+ request->keys = std::get<0>(it->second);
+ for (size_t i = 0; i < request->keys.size(); i++) {
+ request->params.insert(std::pair<std::string, std::string>(request->keys[i].name, sm_res[i + 1]));
+ }
+ write_response(socket, request, std::get<1>(it->second));
+ return;
+ }
+ }
+ }
+ auto it=m_default_resource.find(request->method);
+ if(it!=m_default_resource.end()) {
+ write_response(socket, request, it->second);
+ }
+ }
+
+ void write_response(const std::shared_ptr<socket_type> &socket, const std::shared_ptr<Request> &request, http_handler& resource_function) {
+ //Set timeout on the following asio::async-read or write function
+ auto timer = get_timeout_timer(socket, m_config.timeout_content);
+
+ auto response=std::shared_ptr<Response>(new Response(socket), [this, request, timer](Response *response_ptr) {
+ auto response=std::shared_ptr<Response>(response_ptr);
+ send(response, [this, response, request, timer](const std::error_code& ec) {
+ if (timer)
+ timer->cancel();
+ if (!ec) {
+ float http_version;
+ try {
+ http_version = stof(request->http_version);
+ }
+ catch (const std::exception &) {
+ if (on_error)
+ on_error(request, std::error_code(EPROTO, std::generic_category()));
+ return;
+ }
+
+ auto range = request->header.equal_range("Connection");
+ case_insensitive_equals check;
+ for (auto it = range.first; it != range.second; ++it) {
+ if (check(it->second, "close"))
+ return;
+ }
+ if (http_version > 1.05)
+ read_request_and_content(response->socket());
+ }
+ else if (on_error)
+ on_error(request, ec);
+ });
+ });
+
+ try {
+ resource_function(response, request);
+ }
+ catch(const std::exception &) {
+ if (on_error)
+ on_error(request, std::error_code(EPROTO, std::generic_category()));
+ }
+ }
+ };
+
+ template<class socket_type>
+ class Server : public ServerBase<socket_type> {
+ public:
+ Server(unsigned short port, size_t num_threads, long timeout_request, long timeout_send_or_receive)
+ : ServerBase<socket_type>(port, num_threads, timeout_request, timeout_send_or_receive)
+ {
+ }
+ };
+
+ using HTTP = asio::ip::tcp::socket;
+
+ template<>
+ class Server<HTTP> : public ServerBase<HTTP> {
+ public:
+ Server() : ServerBase<HTTP>::ServerBase(80) {}
+ protected:
+ void accept() override {
+ //Create new socket for this connection
+ //Shared_ptr is used to pass temporary objects to the asynchronous functions
+ auto socket = std::make_shared<HTTP>(*m_io_context);
+
+ acceptor->async_accept(*socket, [this, socket](const std::error_code& ec){
+ //Immediately start accepting a new connection (if io_context hasn't been stopped)
+ if (ec != asio::error::operation_aborted)
+ accept();
+
+ if(!ec) {
+ asio::ip::tcp::no_delay option(true);
+ socket->set_option(option);
+
+ read_request_and_content(socket);
+ } else if (on_error)
+ on_error(std::shared_ptr<Request>(new Request(*socket)), ec);
+ });
+ }
+ };
+
+ class http_server : public Server<HTTP> {
+ public:
+ http_server() : Server<HTTP>::Server() {}
+ };
+}
+#endif /* SERVER_HTTP_HPP */