348 lines
14 KiB
C++
348 lines
14 KiB
C++
/*
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* Authored by Alex Hultman, 2018-2020.
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* Intellectual property of third-party.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef UWS_APP_H
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#define UWS_APP_H
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/* An app is a convenience wrapper of some of the most used fuctionalities and allows a
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* builder-pattern kind of init. Apps operate on the implicit thread local Loop */
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#include "HttpContext.h"
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#include "HttpResponse.h"
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#include "WebSocketContext.h"
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#include "WebSocket.h"
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#include "PerMessageDeflate.h"
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namespace uWS {
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/* This one matches us_socket_context_options_t but has default values */
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struct SocketContextOptions {
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const char *key_file_name = nullptr;
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const char *cert_file_name = nullptr;
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const char *passphrase = nullptr;
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const char *dh_params_file_name = nullptr;
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const char *ca_file_name = nullptr;
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int ssl_prefer_low_memory_usage = 0;
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/* Conversion operator used internally */
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operator struct us_socket_context_options_t() const {
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struct us_socket_context_options_t socket_context_options;
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memcpy(&socket_context_options, this, sizeof(SocketContextOptions));
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return socket_context_options;
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}
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};
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static_assert(sizeof(struct us_socket_context_options_t) == sizeof(SocketContextOptions), "Mismatching uSockets/uWebSockets ABI");
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template <bool SSL>
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struct TemplatedApp {
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private:
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/* The app always owns at least one http context, but creates websocket contexts on demand */
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HttpContext<SSL> *httpContext;
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std::vector<WebSocketContext<SSL, true> *> webSocketContexts;
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public:
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/* Server name */
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TemplatedApp &&addServerName(std::string hostname_pattern, SocketContextOptions options = {}) {
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us_socket_context_add_server_name(SSL, (struct us_socket_context_t *) httpContext, hostname_pattern.c_str(), options);
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return std::move(*this);
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}
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TemplatedApp &&removeServerName(std::string hostname_pattern) {
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us_socket_context_remove_server_name(SSL, (struct us_socket_context_t *) httpContext, hostname_pattern.c_str());
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return std::move(*this);
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}
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TemplatedApp &&missingServerName(fu2::unique_function<void(const char *hostname)> handler) {
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if (!constructorFailed()) {
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httpContext->getSocketContextData()->missingServerNameHandler = std::move(handler);
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us_socket_context_on_server_name(SSL, (struct us_socket_context_t *) httpContext, [](struct us_socket_context_t *context, const char *hostname) {
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/* This is the only requirements of being friends with HttpContextData */
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HttpContext<SSL> *httpContext = (HttpContext<SSL> *) context;
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httpContext->getSocketContextData()->missingServerNameHandler(hostname);
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});
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}
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return std::move(*this);
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}
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/* Returns the SSL_CTX of this app, or nullptr. */
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void *getNativeHandle() {
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return us_socket_context_get_native_handle(SSL, (struct us_socket_context_t *) httpContext);
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}
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/* Attaches a "filter" function to track socket connections/disconnections */
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void filter(fu2::unique_function<void(HttpResponse<SSL> *, int)> &&filterHandler) {
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httpContext->filter(std::move(filterHandler));
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}
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/* Publishes a message to all websocket contexts */
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void publish(std::string_view topic, std::string_view message, OpCode opCode, bool compress = false) {
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for (auto *webSocketContext : webSocketContexts) {
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webSocketContext->getExt()->publish(topic, message, opCode, compress);
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}
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}
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~TemplatedApp() {
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/* Let's just put everything here */
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if (httpContext) {
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httpContext->free();
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for (auto *webSocketContext : webSocketContexts) {
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webSocketContext->free();
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}
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}
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}
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/* Disallow copying, only move */
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TemplatedApp(const TemplatedApp &other) = delete;
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TemplatedApp(TemplatedApp &&other) {
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/* Move HttpContext */
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httpContext = other.httpContext;
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other.httpContext = nullptr;
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/* Move webSocketContexts */
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webSocketContexts = std::move(other.webSocketContexts);
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}
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TemplatedApp(SocketContextOptions options = {}) {
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httpContext = uWS::HttpContext<SSL>::create(uWS::Loop::get(), options);
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}
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bool constructorFailed() {
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return !httpContext;
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}
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struct WebSocketBehavior {
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CompressOptions compression = DISABLED;
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unsigned int maxPayloadLength = 16 * 1024;
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unsigned int idleTimeout = 120;
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unsigned int maxBackpressure = 1 * 1024 * 1024;
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fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *, struct us_socket_context_t *)> upgrade = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *)> open = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *, std::string_view, uWS::OpCode)> message = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *)> drain = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *)> ping = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *)> pong = nullptr;
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fu2::unique_function<void(uWS::WebSocket<SSL, true> *, int, std::string_view)> close = nullptr;
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};
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template <typename UserData>
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TemplatedApp &&ws(std::string pattern, WebSocketBehavior &&behavior) {
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/* Don't compile if alignment rules cannot be satisfied */
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static_assert(alignof(UserData) <= LIBUS_EXT_ALIGNMENT,
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"µWebSockets cannot satisfy UserData alignment requirements. You need to recompile µSockets with LIBUS_EXT_ALIGNMENT adjusted accordingly.");
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if (!httpContext) {
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return std::move(*this);
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}
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/* Every route has its own websocket context with its own behavior and user data type */
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auto *webSocketContext = WebSocketContext<SSL, true>::create(Loop::get(), (us_socket_context_t *) httpContext);
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/* We need to clear this later on */
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webSocketContexts.push_back(webSocketContext);
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/* Quick fix to disable any compression if set */
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#ifdef UWS_NO_ZLIB
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behavior.compression = uWS::DISABLED;
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#endif
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/* If we are the first one to use compression, initialize it */
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if (behavior.compression) {
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LoopData *loopData = (LoopData *) us_loop_ext(us_socket_context_loop(SSL, webSocketContext->getSocketContext()));
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/* Initialize loop's deflate inflate streams */
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if (!loopData->zlibContext) {
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loopData->zlibContext = new ZlibContext;
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loopData->inflationStream = new InflationStream;
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loopData->deflationStream = new DeflationStream(CompressOptions::DEDICATED_COMPRESSOR);
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}
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}
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/* Copy all handlers */
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webSocketContext->getExt()->openHandler = std::move(behavior.open);
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webSocketContext->getExt()->messageHandler = std::move(behavior.message);
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webSocketContext->getExt()->drainHandler = std::move(behavior.drain);
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webSocketContext->getExt()->closeHandler = std::move([closeHandler = std::move(behavior.close)](WebSocket<SSL, true> *ws, int code, std::string_view message) mutable {
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if (closeHandler) {
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closeHandler(ws, code, message);
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}
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/* Destruct user data after returning from close handler */
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((UserData *) ws->getUserData())->~UserData();
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});
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webSocketContext->getExt()->pingHandler = std::move(behavior.ping);
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webSocketContext->getExt()->pongHandler = std::move(behavior.pong);
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/* Copy settings */
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webSocketContext->getExt()->maxPayloadLength = behavior.maxPayloadLength;
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webSocketContext->getExt()->idleTimeout = behavior.idleTimeout;
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webSocketContext->getExt()->maxBackpressure = behavior.maxBackpressure;
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webSocketContext->getExt()->compression = behavior.compression;
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httpContext->onHttp("get", pattern, [webSocketContext, behavior = std::move(behavior)](auto *res, auto *req) mutable {
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/* If we have this header set, it's a websocket */
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std::string_view secWebSocketKey = req->getHeader("sec-websocket-key");
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if (secWebSocketKey.length() == 24) {
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/* Emit upgrade handler */
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if (behavior.upgrade) {
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behavior.upgrade(res, req, (struct us_socket_context_t *) webSocketContext);
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} else {
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/* Default handler upgrades to WebSocket */
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std::string_view secWebSocketProtocol = req->getHeader("sec-websocket-protocol");
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std::string_view secWebSocketExtensions = req->getHeader("sec-websocket-extensions");
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res->template upgrade<UserData>({}, secWebSocketKey, secWebSocketProtocol, secWebSocketExtensions, (struct us_socket_context_t *) webSocketContext);
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}
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/* We are going to get uncorked by the Http get return */
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/* We do not need to check for any close or shutdown here as we immediately return from get handler */
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} else {
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/* Tell the router that we did not handle this request */
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req->setYield(true);
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}
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}, true);
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return std::move(*this);
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}
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TemplatedApp &&get(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("get", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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TemplatedApp &&post(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("post", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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TemplatedApp &&options(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("options", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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TemplatedApp &&del(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("delete", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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TemplatedApp &&patch(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("patch", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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TemplatedApp &&put(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("put", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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TemplatedApp &&head(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("head", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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TemplatedApp &&connect(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("connect", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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TemplatedApp &&trace(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("trace", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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/* This one catches any method */
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TemplatedApp &&any(std::string pattern, fu2::unique_function<void(HttpResponse<SSL> *, HttpRequest *)> &&handler) {
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if (httpContext) {
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httpContext->onHttp("*", pattern, std::move(handler));
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}
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return std::move(*this);
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}
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/* Host, port, callback */
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TemplatedApp &&listen(std::string host, int port, fu2::unique_function<void(us_listen_socket_t *)> &&handler) {
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if (!host.length()) {
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return listen(port, std::move(handler));
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}
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handler(httpContext ? httpContext->listen(host.c_str(), port, 0) : nullptr);
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return std::move(*this);
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}
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/* Host, port, options, callback */
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TemplatedApp &&listen(std::string host, int port, int options, fu2::unique_function<void(us_listen_socket_t *)> &&handler) {
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if (!host.length()) {
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return listen(port, options, std::move(handler));
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}
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handler(httpContext ? httpContext->listen(host.c_str(), port, options) : nullptr);
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return std::move(*this);
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}
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/* Port, callback */
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TemplatedApp &&listen(int port, fu2::unique_function<void(us_listen_socket_t *)> &&handler) {
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handler(httpContext ? httpContext->listen(nullptr, port, 0) : nullptr);
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return std::move(*this);
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}
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/* Port, options, callback */
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TemplatedApp &&listen(int port, int options, fu2::unique_function<void(us_listen_socket_t *)> &&handler) {
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handler(httpContext ? httpContext->listen(nullptr, port, options) : nullptr);
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return std::move(*this);
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}
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TemplatedApp &&run() {
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uWS::run();
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return std::move(*this);
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}
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};
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typedef TemplatedApp<false> App;
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typedef TemplatedApp<true> SSLApp;
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}
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#endif // UWS_APP_H
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