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HttpResponseParser.cpp
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HttpResponseParser.cpp
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#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <unordered_map>
#include <vector>
#include "HttpResponseParser.h"
using std::cout;
using std::endl;
using std::ifstream;
using std::stoi;
using std::string;
using std::stringstream;
using std::unordered_map;
using std::vector;
HttpResponseParser::HttpResponseParser() {
httpVersion = "";
statusCode = 0;
reasonPhrase = "";
validHeaders = 0;
invalidHeaders = 0;
validResponse = true;
}
HttpResponseParser::HttpResponseParser(const string &message) {
validResponse = true;
/*
* Parse the HTTP Response Message
* For Windows, the line separator is "\r\n"
* But for Linux, the line separator is "\n"
*/
// size_t statusLinePosEnd = message.find("\r\n");
size_t statusLinePosEnd = message.find("\n");
if (statusLinePosEnd == string::npos) {
cout << "Invalid HTTP Response Message" << endl;
validResponse = false; // Set validResponse to false
return;
}
// Parse the status line
string statusLine = message.substr(0, statusLinePosEnd);
// Part1: The version of HTTP
size_t httpVerPosEnd = statusLine.find(" ");
if (httpVerPosEnd == string::npos) {
cout << "Invalid HTTP response: Invalid status line" << endl;
validResponse = false;
return;
}
string httpVerString = statusLine.substr(0, httpVerPosEnd);
size_t httpVerSeparatorPos = httpVerString.find("/");
httpVersion = httpVerString.substr(httpVerSeparatorPos + 1);
// Part2: The status code
size_t statusCodePosStart = httpVerPosEnd + 1;
size_t statusCodePosEnd = statusLine.find(" ", statusCodePosStart);
if (statusCodePosEnd == string::npos) {
cout << "Invalid HTTP response: Invalid status line" << endl;
validResponse = false;
return;
}
string statusCodeString = statusLine.substr(statusCodePosStart,
statusCodePosEnd - statusCodePosStart);
statusCode = stoi(statusCodeString);
// Part3: The response phrase
reasonPhrase = statusLine.substr(statusCodePosEnd + 1);
// Parse the headers
size_t headersPosStart = statusLinePosEnd + 2;
validHeaders = 0;
invalidHeaders = 0;
while (headersPosStart < message.length()) {
// one header per line
size_t headerPosEnd = message.find("\n", headersPosStart);
if (headerPosEnd == string::npos) {
break;
}
string header = message.substr(headersPosStart,
headerPosEnd - headersPosStart);
size_t headerSeparatorPos = header.find(":");
if (headerSeparatorPos != string::npos) {
string headerName = header.substr(0, headerSeparatorPos);
string headerValue = header.substr(headerSeparatorPos + 1);
headers[headerName] = headerValue;
++validHeaders;
} else {
++invalidHeaders;
}
// move to the next header
headersPosStart = headerPosEnd + 2;
}
}
bool HttpResponseParser::isvalidResponse() const {
return validResponse;
}
string HttpResponseParser::lookupHeaderValueByName(const string &headerName) const {
// lookup the header value by name in the unordered_map
auto iter = headers.find(headerName);
if (iter != headers.end()) {
return iter->second;
}
return "";
}
// Output the headers
void HttpResponseParser::printHeaders() const {
// cout << "Headers:" << endl;
for (const auto &header : headers) {
cout << header.first << ": " << header.second << endl;
}
}
int HttpResponseParser::getValidHeadersCount() const {
return validHeaders;
}
int HttpResponseParser::getInvalidHeadersCount() const {
return invalidHeaders;
}
int HttpResponseParser::getStatusCode() const {
return statusCode;
}
string HttpResponseParser::getHttpVersion() const {
return httpVersion;
}
string HttpResponseParser::getReasonPhrase() const {
return reasonPhrase;
}