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// $Id: http_socket.cpp,v 1.2 2006/03/16 23:32:24 hawaii Exp $
// $Copyright: (c)2001 National Biocomputation Center, Stanford University $

//
// SEE http_socket.h for further info!
//

#include "http_socket.h"

#include <string.h>
#include <stdio.h>
#include <stdlib.h>


const char* HttpSocket::rcsid = "@(#) $Id: http_socket.cpp,v 1.2 2006/03/16 23:32:24 hawaii Exp $ $Copyright: (c)2001 National Biocomputation Center, Stanford University $";
int HttpSocket::debug = 0;


// http socket constructor
HttpSocket::HttpSocket(char* host, int port) : Socket(host, Socket::tcp, port, 1024) {
  this->host = host;
}

// destructor
HttpSocket::~HttpSocket() {

}

// send a request using HTTP POST (returns NULL, if an error occured)
// -filePath: e.g. "/", "/projects/index.html", "/projects/index.jsp" ...
// -requestData: any data
// -requestSize: the size of the request data
// -responseSize: the actual size of the data obtained (by reference)
// -RETURN VALUE: The returned data (no header)
char* HttpSocket::postRequest(char* filePath, char* requestData, int requestSize, int &responseSize) {
  responseSize = 0;
  char headerData[1024];
  sprintf(headerData, "POST %s HTTP/1.1\r\n"
                          "Host: %s\r\n"
                                          "User-Agent: SPRING HttpSocket\r\n"
                                          "Content-Length: %i\r\n"
                                          "Content-Type: application/octet-stream\r\n"
                                          "\r\n\0", filePath, host, requestSize);
  int headerSize = strlen(headerData);

  // and send header
  int bytesSent = Send(headerData, headerSize);
  if (bytesSent != headerSize) {
          // error sending header
          return NULL;
  }
  else {
      // send data
          bytesSent = Send(requestData, requestSize);
          if (bytesSent != requestSize) {
                // error occured, did not send all bytes!
                return NULL;
          }
          else {
                // get data
                char line[256];
                int lineLength;

                // read header + find content-length!
                do {
                  lineLength = 0;
                  char character[1];
                  do {
                        if (Receive(character, 1) == 0) {
                                // error occured
                                return NULL;
                        }
                        line[lineLength] = character[0];
                        lineLength++;
                  } 
                  while (character[0] != '\n');
                  line[lineLength] = '\0';

                  // check if length description
                  if ((strstr(line, "Content-length:")) || (strstr(line, "Content-Length:"))) {
                        // find length
                        int index = lineLength - 3;
                        int multiplier = 1;
                        while ((line[index] != ' ') && (line[index] != ':')) {
                          responseSize += (line[index] - '0') * multiplier;
                          multiplier *= 10;
                          index--;
                        }
                  }
                }
                while (line[0] != '\r');

                // read data
                char* responseData = new char[responseSize];
                Receive(responseData, responseSize);

                // and return data
                return responseData;
          }
  }
}

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