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IXHttp.cpp
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227 lines (195 loc) · 6.68 KB
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/*
* IXHttp.cpp
* Author: Benjamin Sergeant
* Copyright (c) 2019 Machine Zone, Inc. All rights reserved.
*/
#include "IXHttp.h"
#include "IXCancellationRequest.h"
#include "IXGzipCodec.h"
#include "IXSocket.h"
#include <sstream>
#include <vector>
namespace ix
{
std::string Http::trim(const std::string& str)
{
std::string out;
for (auto c : str)
{
if (c != ' ' && c != '\n' && c != '\r')
{
out += c;
}
}
return out;
}
std::pair<std::string, int> Http::parseStatusLine(const std::string& line)
{
// Request-Line = Method SP Request-URI SP HTTP-Version CRLF
std::string token;
std::stringstream tokenStream(line);
std::vector<std::string> tokens;
// Split by ' '
while (std::getline(tokenStream, token, ' '))
{
tokens.push_back(token);
}
std::string httpVersion;
if (tokens.size() >= 1)
{
httpVersion = trim(tokens[0]);
}
int statusCode = -1;
if (tokens.size() >= 2)
{
std::stringstream ss;
ss << trim(tokens[1]);
ss >> statusCode;
}
return std::make_pair(httpVersion, statusCode);
}
std::tuple<std::string, std::string, std::string> Http::parseRequestLine(
const std::string& line)
{
// Request-Line = Method SP Request-URI SP HTTP-Version CRLF
std::string token;
std::stringstream tokenStream(line);
std::vector<std::string> tokens;
// Split by ' '
while (std::getline(tokenStream, token, ' '))
{
tokens.push_back(token);
}
std::string method;
if (tokens.size() >= 1)
{
method = trim(tokens[0]);
}
std::string requestUri;
if (tokens.size() >= 2)
{
requestUri = trim(tokens[1]);
}
std::string httpVersion;
if (tokens.size() >= 3)
{
httpVersion = trim(tokens[2]);
}
return std::make_tuple(method, requestUri, httpVersion);
}
std::tuple<bool, std::string, HttpRequestPtr> Http::parseRequest(
std::unique_ptr<Socket>& socket, int timeoutSecs)
{
HttpRequestPtr httpRequest;
std::atomic<bool> requestInitCancellation(false);
auto isCancellationRequested =
makeCancellationRequestWithTimeout(timeoutSecs, requestInitCancellation);
// Read first line
auto lineResult = socket->readLine(isCancellationRequested);
auto lineValid = lineResult.first;
auto line = lineResult.second;
if (!lineValid)
{
return std::make_tuple(false, "Error reading HTTP request line", httpRequest);
}
// Parse request line (GET /foo HTTP/1.1\r\n)
auto requestLine = Http::parseRequestLine(line);
auto method = std::get<0>(requestLine);
auto uri = std::get<1>(requestLine);
auto httpVersion = std::get<2>(requestLine);
// Retrieve and validate HTTP headers
auto result = parseHttpHeaders(socket, isCancellationRequested);
auto headersValid = result.first;
auto headers = result.second;
if (!headersValid)
{
return std::make_tuple(false, "Error parsing HTTP headers", httpRequest);
}
std::string body;
if (headers.find("Content-Length") != headers.end())
{
int contentLength = 0;
{
const char* p = headers["Content-Length"].c_str();
char* p_end {};
errno = 0;
long val = std::strtol(p, &p_end, 10);
if (p_end == p // invalid argument
|| errno == ERANGE // out of range
)
{
return std::make_tuple(
false, "Error parsing HTTP Header 'Content-Length'", httpRequest);
}
if (val > std::numeric_limits<int>::max())
{
return std::make_tuple(
false, "Error: 'Content-Length' value was above max", httpRequest);
}
if (val < std::numeric_limits<int>::min())
{
return std::make_tuple(
false, "Error: 'Content-Length' value was below min", httpRequest);
}
contentLength = static_cast<int>(val);
}
if (contentLength < 0)
{
return std::make_tuple(
false, "Error: 'Content-Length' should be a positive integer", httpRequest);
}
auto res = socket->readBytes(contentLength, nullptr, nullptr, isCancellationRequested);
if (!res.first)
{
return std::make_tuple(
false, std::string("Error reading request: ") + res.second, httpRequest);
}
body = res.second;
}
// If the content was compressed with gzip, decode it
if (headers["Content-Encoding"] == "gzip")
{
#ifdef IXWEBSOCKET_USE_ZLIB
std::string decompressedPayload;
if (!gzipDecompress(body, decompressedPayload))
{
return std::make_tuple(
false, std::string("Error during gzip decompression of the body"), httpRequest);
}
body = decompressedPayload;
#else
std::string errorMsg("ixwebsocket was not compiled with gzip support on");
return std::make_tuple(false, errorMsg, httpRequest);
#endif
}
httpRequest = std::make_shared<HttpRequest>(uri, method, httpVersion, body, headers);
return std::make_tuple(true, "", httpRequest);
}
bool Http::sendResponse(HttpResponsePtr response, std::unique_ptr<Socket>& socket)
{
// Write the response to the socket
std::stringstream ss;
ss << "HTTP/1.1 ";
ss << response->statusCode;
ss << " ";
ss << response->description;
ss << "\r\n";
if (!socket->writeBytes(ss.str(), nullptr))
{
return false;
}
// Write headers
ss.str("");
ss << "Content-Length: " << response->body.size() << "\r\n";
for (auto&& it : response->headers)
{
ss << it.first << ": " << it.second << "\r\n";
}
ss << "\r\n";
if (!socket->writeBytes(ss.str(), nullptr))
{
return false;
}
return response->body.empty() ? true : socket->writeBytes(response->body, nullptr);
}
} // namespace ix