third_party/ot-br-posix/repo/third_party/Simple-web-server/repo/http_examples.cpp

   1 #include "server_http.hpp"
   2 #include "client_http.hpp"
   3
   4 //Added for the json-example
   5 #define BOOST_SPIRIT_THREADSAFE
   6 #include <boost/property_tree/ptree.hpp>
   7 #include <boost/property_tree/json_parser.hpp>
   8
   9 //Added for the default_resource example
  10 #include <fstream>
  11 #include <boost/filesystem.hpp>
  12 #include <vector>
  13 #include <algorithm>
  14 #ifdef HAVE_OPENSSL
  15 #include "crypto.hpp"
  16 #endif
  17
  18 using namespace std;
  19 //Added for the json-example:
  20 using namespace boost::property_tree;
  21
  22 typedef SimpleWeb::Server<SimpleWeb::HTTP> HttpServer;
  23 typedef SimpleWeb::Client<SimpleWeb::HTTP> HttpClient;
  24
  25 //Added for the default_resource example
  26 void default_resource_send(const HttpServer &server, const shared_ptr<HttpServer::Response> &response,
  27                            const shared_ptr<ifstream> &ifs);
  28
  29 int main() {
  30     //HTTP-server at port 8080 using 1 thread
  31     //Unless you do more heavy non-threaded processing in the resources,
  32     //1 thread is usually faster than several threads
  33     HttpServer server;
  34     server.config.port=80;
  35
  36     //Add resources using path-regex and method-string, and an anonymous function
  37     //POST-example for the path /string, responds the posted string
  38     server.resource["^/string$"]["POST"]=[](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {
  39         //Retrieve string:
  40         auto content=request->content.string();
  41         //request->content.string() is a convenience function for:
  42         //stringstream ss;
  43         //ss << request->content.rdbuf();
  44         //string content=ss.str();
  45
  46         *response << "HTTP/1.1 200 OK\r\nContent-Length: " << content.length() << "\r\n\r\n" << content;
  47     };
  48
  49     //POST-example for the path /json, responds firstName+" "+lastName from the posted json
  50     //Responds with an appropriate error message if the posted json is not valid, or if firstName or lastName is missing
  51     //Example posted json:
  52     //{
  53     //  "firstName": "John",
  54     //  "lastName": "Smith",
  55     //  "age": 25
  56     //}
  57     server.resource["^/json$"]["POST"]=[](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {
  58         try {
  59             ptree pt;
  60             read_json(request->content, pt);
  61
  62             string name=pt.get<string>("firstName")+" "+pt.get<string>("lastName");
  63
  64             *response << "HTTP/1.1 200 OK\r\n"
  65                       << "Content-Type: application/json\r\n"
  66                       << "Content-Length: " << name.length() << "\r\n\r\n"
  67                       << name;
  68         }
  69         catch(exception& e) {
  70             *response << "HTTP/1.1 400 Bad Request\r\nContent-Length: " << strlen(e.what()) << "\r\n\r\n" << e.what();
  71         }
  72     };
  73
  74     //GET-example for the path /info
  75     //Responds with request-information
  76     server.resource["^/info$"]["GET"]=[](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {
  77         stringstream content_stream;
  78         content_stream << "<h1>Request from " << request->remote_endpoint_address << " (" << request->remote_endpoint_port << ")</h1>";
  79         content_stream << request->method << " " << request->path << " HTTP/" << request->http_version << "<br>";
  80         for(auto& header: request->header) {
  81             content_stream << header.first << ": " << header.second << "<br>";
  82         }
  83
  84         //find length of content_stream (length received using content_stream.tellp())
  85         content_stream.seekp(0, ios::end);
  86
  87         *response <<  "HTTP/1.1 200 OK\r\nContent-Length: " << content_stream.tellp() << "\r\n\r\n" << content_stream.rdbuf();
  88     };
  89
  90     //GET-example for the path /match/[number], responds with the matched string in path (number)
  91     //For instance a request GET /match/123 will receive: 123
  92     server.resource["^/match/([0-9]+)$"]["GET"]=[&server](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {
  93         string number=request->path_match[1];
  94         *response << "HTTP/1.1 200 OK\r\nContent-Length: " << number.length() << "\r\n\r\n" << number;
  95     };
  96
  97     //Get example simulating heavy work in a separate thread
  98     server.resource["^/work$"]["GET"]=[&server](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> /*request*/) {
  99         thread work_thread([response] {
 100             this_thread::sleep_for(chrono::seconds(5));
 101             string message="Work done";
 102             *response << "HTTP/1.1 200 OK\r\nContent-Length: " << message.length() << "\r\n\r\n" << message;
 103         });
 104         work_thread.detach();
 105     };
 106
 107     server.resource["^/getAvailableNetwork$"]["GET"]=[&server](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> /*request*/) {
 108         thread work_thread([response] {
 109             this_thread::sleep_for(chrono::seconds(5));
 110             // string message="Work done";
 111             string json_string="{\"result\":[{\"ch\":13,\"ha\":\"18B43000003D2785\",\"nn\":\"NEST-PAN-C1E7\",\"pi\":\"0xC19B\",\"xp\":\"EEA74CE1EDFA2E8A\"}]}";
 112             // string json_string="{\"firstName\": \"John\",\"lastName\": \"Smith\",\"age\": 25}";
 113             *response << "HTTP/1.1 200 OK\r\nContent-Length: " << json_string.length() << "\r\nContent-Type:application/json; charset=utf-8" << "\r\n\r\n" << json_string;
 114         });
 115         work_thread.detach();
 116     };
 117
 118     //Default GET-example. If no other matches, this anonymous function will be called.
 119     //Will respond with content in the web/-directory, and its subdirectories.
 120     //Default file: index.html
 121     //Can for instance be used to retrieve an HTML 5 client that uses REST-resources on this server
 122     server.default_resource["GET"]=[&server](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {
 123         try {
 124             auto web_root_path=boost::filesystem::canonical("web");
 125             auto path=boost::filesystem::canonical(web_root_path/request->path);
 126             //Check if path is within web_root_path
 127             if(distance(web_root_path.begin(), web_root_path.end())>distance(path.begin(), path.end()) ||
 128                !equal(web_root_path.begin(), web_root_path.end(), path.begin()))
 129                 throw invalid_argument("path must be within root path");
 130             if(boost::filesystem::is_directory(path))
 131                 path/="index.html";
 132             if(!(boost::filesystem::exists(path) && boost::filesystem::is_regular_file(path)))
 133                 throw invalid_argument("file does not exist");
 134
 135             std::string cache_control, etag;
 136
 137             // Uncomment the following line to enable Cache-Control
 138             // cache_control="Cache-Control: max-age=86400\r\n";
 139
 140 #ifdef HAVE_OPENSSL
 141             // Uncomment the following lines to enable ETag
 142             // {
 143             //     ifstream ifs(path.string(), ifstream::in | ios::binary);
 144             //     if(ifs) {
 145             //         auto hash=SimpleWeb::Crypto::to_hex_string(SimpleWeb::Crypto::md5(ifs));
 146             //         etag = "ETag: \""+hash+"\"\r\n";
 147             //         auto it=request->header.find("If-None-Match");
 148             //         if(it!=request->header.end()) {
 149             //             if(!it->second.empty() && it->second.compare(1, hash.size(), hash)==0) {
 150             //                 *response << "HTTP/1.1 304 Not Modified\r\n" << cache_control << etag << "\r\n\r\n";
 151             //                 return;
 152             //             }
 153             //         }
 154             //     }
 155             //     else
 156             //         throw invalid_argument("could not read file");
 157             // }
 158 #endif
 159
 160             auto ifs=make_shared<ifstream>();
 161             ifs->open(path.string(), ifstream::in | ios::binary | ios::ate);
 162
 163             if(*ifs) {
 164                 auto length=ifs->tellg();
 165                 ifs->seekg(0, ios::beg);
 166
 167                 *response << "HTTP/1.1 200 OK\r\n" << cache_control << etag << "Content-Length: " << length << "\r\n\r\n";
 168                 default_resource_send(server, response, ifs);
 169             }
 170             else
 171                 throw invalid_argument("could not read file");
 172         }
 173         catch(const exception &e) {
 174             string content="Could not open path "+request->path+": "+e.what();
 175             *response << "HTTP/1.1 400 Bad Request\r\nContent-Length: " << content.length() << "\r\n\r\n" << content;
 176         }
 177     };
 178
 179     thread server_thread([&server](){
 180         //Start server
 181         server.start();
 182     });
 183
 184     //Wait for server to start so that the client can connect
 185     this_thread::sleep_for(chrono::seconds(1));
 186
 187     // //Client examples
 188     // HttpClient client("localhost:8080");
 189     // auto r1=client.request("GET", "/match/123");
 190     // cout << r1->content.rdbuf() << endl;
 191
 192     // string json_string="{\"firstName\": \"John\",\"lastName\": \"Smith\",\"age\": 25}";
 193     // auto r2=client.request("POST", "/string", json_string);
 194     // cout << r2->content.rdbuf() << endl;
 195
 196     // auto r3=client.request("POST", "/json", json_string);
 197     // cout << r3->content.rdbuf() << endl;
 198
 199     server_thread.join();
 200
 201     return 0;
 202 }
 203
 204 void default_resource_send(const HttpServer &server, const shared_ptr<HttpServer::Response> &response,
 205                            const shared_ptr<ifstream> &ifs) {
 206     //read and send 128 KB at a time
 207     static vector<char> buffer(131072); // Safe when server is running on one thread
 208     streamsize read_length;
 209     if((read_length=ifs->read(&buffer[0], buffer.size()).gcount())>0) {
 210         response->write(&buffer[0], read_length);
 211         if(read_length==static_cast<streamsize>(buffer.size())) {
 212             server.send(response, [&server, response, ifs](const boost::system::error_code &ec) {
 213                 if(!ec)
 214                     default_resource_send(server, response, ifs);
 215                 else
 216                     cerr << "Connection interrupted" << endl;
 217             });
 218         }
 219     }
 220 }