simple HTTP post support (urlencode parameters)

examples/http_client/.gitignore

@@ -1 +0,0 @@
-build

examples/http_client/CMakeLists.txt

@@ -1,22 +0,0 @@
-#
-# Author: Benjamin Sergeant
-# Copyright (c) 2018 Machine Zone, Inc. All rights reserved.
-#
-
-cmake_minimum_required (VERSION 3.4.1)
-project (http_client)
-
-set (CMAKE_CXX_STANDARD 14)
-
-option(USE_TLS "Add TLS support" ON)
-
-add_subdirectory(${PROJECT_SOURCE_DIR}/../.. ixwebsocket)
-
-add_executable(http_client http_client.cpp)
-
-if (APPLE AND USE_TLS)
-    target_link_libraries(http_client "-framework foundation" "-framework security")
-endif()
-
-target_link_libraries(http_client ixwebsocket)
-install(TARGETS http_client DESTINATION bin)

ixwebsocket/IXHttpClient.cpp

@@ -18,6 +18,7 @@
 
 #include <iostream>
 #include <sstream>
+#include <iomanip>
 #include <vector>
 
 namespace ix
@@ -32,7 +33,10 @@ namespace ix
 
     }
 
-    HttpResponse HttpClient::get(const std::string& url,
+    HttpResponse HttpClient::request(
+        const std::string& url,
+        const std::string& verb,
+        const HttpParameters& httpParameters,
         bool verbose)
     {
         int code = 0;
@@ -68,17 +72,47 @@ namespace ix
             return std::make_tuple(code, headers, payload, errorMsg);
         }
 
-        // FIXME: missing url parsing
+        std::string body;
+        if (verb == "POST")
+        {
+            std::stringstream ss;
+            size_t count = httpParameters.size();
+            size_t i = 0;
+
+            for (auto&& it : httpParameters)
+            {
+                ss << urlEncode(it.first)
+                   << "="
+                   << urlEncode(it.second);
+
+                if (i++ < (count-1))
+                {
+                   ss << "&";
+                }
+            }
+            body = ss.str();
+        }
 
         std::stringstream ss;
-        ss << "GET " << path << " HTTP/1.1\r\n";
+        ss << verb << " " << path << " HTTP/1.1\r\n";
         ss << "Host: " << host << "\r\n";
         ss << "User-Agent: ixwebsocket/1.0.0" << "\r\n";
         ss << "Accept: */*" << "\r\n";
+        if (verb == "POST")
+        {
+            ss << "Content-Length: " << body.size() << "\r\n";
+            ss << "Content-Type: application/x-www-form-urlencoded" << "\r\n";
             ss << "\r\n";
+            ss << body;
+        }
+        else
+        {
+            ss << "\r\n";
+        }
+
         std::string request(ss.str());
 
-        int timeoutSecs = 3;
+        int timeoutSecs = 10;
 
         std::string errMsg;
         static std::atomic<bool> requestInitCancellation(false);
@@ -95,8 +129,12 @@ namespace ix
 
         if (verbose)
         {
-            std::cout << "Sending request: " << request
+            std::cout << "Sending " << verb << " request "
-                      << "to " << host << ":" << port
+                      << "to " << host << ":" << port << std::endl
+                      << "request size: " << request.size() << " bytes"
+                      << "=============" << std::endl
+                      << request
+                      << "=============" << std::endl
                       << std::endl;
         }
 
@@ -174,6 +212,48 @@ namespace ix
 
         return std::make_tuple(code, headers, payload, "");
     }
+
+    HttpResponse HttpClient::get(
+        const std::string& url,
+        bool verbose)
+    {
+        return request(url, "GET", HttpParameters(), verbose);
+    }
+
+    HttpResponse HttpClient::post(
+        const std::string& url,
+        const HttpParameters& httpParameters,
+        bool verbose)
+    {
+        return request(url, "POST", httpParameters, verbose);
+    }
+
+    std::string HttpClient::urlEncode(const std::string& value)
+    {
+        std::ostringstream escaped;
+        escaped.fill('0');
+        escaped << std::hex;
+
+        for (std::string::const_iterator i = value.begin(), n = value.end();
+             i != n; ++i)
+        {
+            std::string::value_type c = (*i);
+
+            // Keep alphanumeric and other accepted characters intact
+            if (isalnum(c) || c == '-' || c == '_' || c == '.' || c == '~')
+            {
+                escaped << c;
+                continue;
+            }
+
+            // Any other characters are percent-encoded
+            escaped << std::uppercase;
+            escaped << '%' << std::setw(2) << int((unsigned char) c);
+            escaped << std::nouppercase;
+        }
+
+        return escaped.str();
+    }
 }
 
 #if 0

ixwebsocket/IXHttpClient.h

@@ -12,6 +12,7 @@
 #include <atomic>
 #include <tuple>
 #include <memory>
+#include <map>
 
 #include "IXSocket.h"
 #include "IXWebSocketHttpHeaders.h"
@@ -19,6 +20,7 @@
 namespace ix
 {
     using HttpResponse = std::tuple<int, WebSocketHttpHeaders, std::string, std::string>;
+    using HttpParameters = std::map<std::string, std::string>;
 
     class HttpClient {
     public:
@@ -27,8 +29,18 @@ namespace ix
 
         // Static methods ?
         HttpResponse get(const std::string& url, bool verbose);
+        HttpResponse post(const std::string& url,
+                          const HttpParameters& httpParameters,
+                          bool verbose);
 
     private:
+        HttpResponse request(const std::string& url,
+                             const std::string& verb,
+                             const HttpParameters& httpParameters,
+                             bool verbose);
+
+        std::string urlEncode(const std::string& value);
+
         std::shared_ptr<Socket> _socket;
     };
 }

ws/ws.cpp

@@ -17,7 +17,8 @@
 
 namespace ix
 {
-    int ws_http_client_main(const std::string& url);
+    int ws_http_client_main(const std::string& url,
+                            const std::string& data);
 
     int ws_ping_pong_main(const std::string& url);
 
@@ -47,11 +48,13 @@ int main(int argc, char** argv)
     std::string url("ws://127.0.0.1:8080");
     std::string path;
     std::string user;
+    std::string data;
     int port = 8080;
 
     CLI::App* sendApp = app.add_subcommand("send", "Send a file");
     sendApp->add_option("url", url, "Connection url")->required();
-    sendApp->add_option("path", path, "Path to the file to send")->required();
+    sendApp->add_option("path", path, "Path to the file to send")
+        ->required()->check(CLI::ExistingPath);
 
     CLI::App* receiveApp = app.add_subcommand("receive", "Receive a file");
     receiveApp->add_option("url", url, "Connection url")->required();
@@ -77,6 +80,8 @@ int main(int argc, char** argv)
 
     CLI::App* httpClientApp = app.add_subcommand("http_client", "HTTP Client");
     httpClientApp->add_option("url", url, "Connection url")->required();
+    httpClientApp->add_option("-d", data, "Form data")->join();
+    httpClientApp->add_option("-F", data, "Form data")->join();
 
     CLI11_PARSE(app, argc, argv);
 
@@ -117,7 +122,8 @@ int main(int argc, char** argv)
     }
     else if (app.got_subcommand("http_client"))
     {
-        return ix::ws_http_client_main(url);
+        std::cout << "data: " << data << std::endl;
+        return ix::ws_http_client_main(url, data);
     }
 
     return 1;

ws/ws_http_client.cpp

@@ -10,11 +10,51 @@
 
 namespace ix
 {
-    void ws_http_client_main(const std::string& url)
+    //
+    // Useful endpoint to test HTTP post
+    // https://postman-echo.com/post
+    //
+    HttpParameters parsePostParameters(const std::string& data)
     {
+        HttpParameters httpParameters;
+
+        // Split by ;
+        std::string token;
+        std::stringstream tokenStream(data);
+
+        while (std::getline(tokenStream, token))
+        {
+            std::size_t pos = token.rfind('=');
+
+            // Bail out if last '.' is found
+            if (pos == std::string::npos) continue;
+
+            auto key = token.substr(0, pos);
+            auto val = token.substr(pos+1);
+
+            std::cout << key << ": " << val << std::endl;
+            httpParameters[key] = val;
+        }
+
+        return httpParameters;
+    }
+
+    int ws_http_client_main(const std::string& url,
+                            const std::string& data)
+    {
+        HttpParameters httpParameters = parsePostParameters(data);
+
         HttpClient httpClient;
         bool verbose = true;
-        auto out = httpClient.get(url, verbose);
+        HttpResponse out;
+        if (data.empty())
+        {
+            out = httpClient.get(url, verbose);
+        }
+        else
+        {
+            out = httpClient.post(url, httpParameters, verbose);
+        }
         auto errorCode = std::get<0>(out);
         auto headers = std::get<1>(out);
         auto payload = std::get<2>(out);
@@ -32,5 +72,7 @@ namespace ix
         }
 
         std::cout << "payload: " << payload << std::endl;
+
+        return 0;
     }
 }