SFML/src/SFML/Network/Http.cpp at master · githubhy/SFML · GitHub

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////////////////////////////////////////////////////////////

// SFML - Simple and Fast Multimedia Library

// This software is provided 'as-is', without any express or implied warranty.

// In no event will the authors be held liable for any damages arising from the use of this software.

// Permission is granted to anyone to use this software for any purpose,

// including commercial applications, and to alter it and redistribute it freely,

// subject to the following restrictions:

// 1. The origin of this software must not be misrepresented;

// you must not claim that you wrote the original software.

// If you use this software in a product, an acknowledgment

// in the product documentation would be appreciated but is not required.

// 2. Altered source versions must be plainly marked as such,

// and must not be misrepresented as being the original software.

// 3. This notice may not be removed or altered from any source distribution.

////////////////////////////////////////////////////////////

// Headers

////////////////////////////////////////////////////////////

#include <SFML/Network/Http.hpp>

#include <SFML/System/Err.hpp>

#include <SFML/System/Utils.hpp>

#include <algorithm>

#include <iterator>

#include <limits>

#include <ostream>

#include <sstream>

#include <utility>

#include <cctype>

#include <cstddef>

namespace sf

{

////////////////////////////////////////////////////////////

Http::Request::Request(const std::string& uri, Method method, const std::string& body) : m_method(method)

{

setUri(uri);

setBody(body);

}

////////////////////////////////////////////////////////////

void Http::Request::setField(const std::string& field, const std::string& value)

{

m_fields[toLower(field)] = value;

}

////////////////////////////////////////////////////////////

void Http::Request::setMethod(Http::Request::Method method)

{

m_method = method;

}

////////////////////////////////////////////////////////////

void Http::Request::setUri(const std::string& uri)

{

m_uri = uri;

// Make sure it starts with a '/'

if (m_uri.empty() || (m_uri[0] != '/'))

m_uri.insert(m_uri.begin(), '/');

}

////////////////////////////////////////////////////////////

void Http::Request::setHttpVersion(unsigned int major, unsigned int minor)

{

m_majorVersion = major;

m_minorVersion = minor;

}

////////////////////////////////////////////////////////////

void Http::Request::setBody(const std::string& body)

{

m_body = body;

}

////////////////////////////////////////////////////////////

std::string Http::Request::prepare() const

{

std::ostringstream out;

// Convert the method to its string representation

std::string method;

switch (m_method)

{

case Method::Get:

method = "GET";

break;

case Method::Post:

method = "POST";

break;

case Method::Head:

method = "HEAD";

break;

case Method::Put:

method = "PUT";

break;

case Method::Delete:

method = "DELETE";

break;

}

// Write the first line containing the request type

out << method << " " << m_uri << " ";

out << "HTTP/" << m_majorVersion << "." << m_minorVersion << "\r\n";

// Write fields

for (const auto& [fieldKey, fieldValue] : m_fields)

{

out << fieldKey << ": " << fieldValue << "\r\n";

}

// Use an extra \r\n to separate the header from the body

out << "\r\n";

// Add the body

out << m_body;

return out.str();

}

////////////////////////////////////////////////////////////

bool Http::Request::hasField(const std::string& field) const

{

return m_fields.find(toLower(field)) != m_fields.end();

}

////////////////////////////////////////////////////////////

const std::string& Http::Response::getField(const std::string& field) const

{

if (const auto it = m_fields.find(toLower(field)); it != m_fields.end())

{

return it->second;

}

static const std::string empty;

return empty;

}

////////////////////////////////////////////////////////////

Http::Response::Status Http::Response::getStatus() const

{

return m_status;

}

////////////////////////////////////////////////////////////

unsigned int Http::Response::getMajorHttpVersion() const

{

return m_majorVersion;

}

////////////////////////////////////////////////////////////

unsigned int Http::Response::getMinorHttpVersion() const

{

return m_minorVersion;

}

////////////////////////////////////////////////////////////

const std::string& Http::Response::getBody() const

{

return m_body;

}

////////////////////////////////////////////////////////////

void Http::Response::parse(const std::string& data)

{

std::istringstream in(data);

// Extract the HTTP version from the first line

std::string version;

if (in >> version)

{

if ((version.size() >= 8) && (version[6] == '.') && (toLower(version.substr(0, 5)) == "http/") &&

std::isdigit(version[5]) && std::isdigit(version[7]))

{

m_majorVersion = static_cast<unsigned int>(version[5] - '0');

m_minorVersion = static_cast<unsigned int>(version[7] - '0');

}

else

{

// Invalid HTTP version

m_status = Status::InvalidResponse;

return;

}

// Extract the status code from the first line

int status = 0;

if (in >> status)

{

m_status = static_cast<Status>(status);

}

else

{

// Invalid status code

m_status = Status::InvalidResponse;

return;

}

// Ignore the end of the first line

in.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

// Parse the other lines, which contain fields, one by one

parseFields(in);

m_body.clear();

// Determine whether the transfer is chunked

if (toLower(getField("transfer-encoding")) != "chunked")

{

// Not chunked - just read everything at once

std::copy(std::istreambuf_iterator<char>(in), std::istreambuf_iterator<char>(), std::back_inserter(m_body));

}

else

{

// Chunked - have to read chunk by chunk

std::size_t length = 0;

// Read all chunks, identified by a chunk-size not being 0

while (in >> std::hex >> length)

{

// Drop the rest of the line (chunk-extension)

in.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

// Copy the actual content data

std::istreambuf_iterator<char> it(in);

const std::istreambuf_iterator<char> itEnd;

for (std::size_t i = 0; ((i < length) && (it != itEnd)); ++i)

{

m_body.push_back(*it);

++it; // Iterate in separate expression to work around false positive -Wnull-dereference warning in GCC 12.1.0

}

// Drop the rest of the line (chunk-extension)

in.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

// Read all trailers (if present)

parseFields(in);

}

////////////////////////////////////////////////////////////

void Http::Response::parseFields(std::istream& in)

{

std::string line;

while (std::getline(in, line) && (line.size() > 2))

{

const std::string::size_type pos = line.find(": ");

if (pos != std::string::npos)

{

// Extract the field name and its value

const std::string field = line.substr(0, pos);

std::string value = line.substr(pos + 2);

// Remove any trailing \r

if (!value.empty() && (*value.rbegin() == '\r'))

value.erase(value.size() - 1);

// Add the field

m_fields[toLower(field)] = value;

}

////////////////////////////////////////////////////////////

Http::Http(const std::string& host, unsigned short port)

{

setHost(host, port);

}

////////////////////////////////////////////////////////////

void Http::setHost(const std::string& host, unsigned short port)

{

// Check the protocol

if (toLower(host.substr(0, 7)) == "http://")

{

// HTTP protocol

m_hostName = host.substr(7);

m_port = (port != 0 ? port : 80);

}

else if (toLower(host.substr(0, 8)) == "https://")

{

// HTTPS protocol -- unsupported (requires encryption and certificates and stuff...)

err() << "HTTPS protocol is not supported by sf::Http" << std::endl;

m_hostName.clear();

m_port = 0;

}

else

{

// Undefined protocol - use HTTP

m_hostName = host;

m_port = (port != 0 ? port : 80);

}

// Remove any trailing '/' from the host name

if (!m_hostName.empty() && (*m_hostName.rbegin() == '/'))

m_hostName.erase(m_hostName.size() - 1);

m_host = IpAddress::resolve(m_hostName);

}

////////////////////////////////////////////////////////////

Http::Response Http::sendRequest(const Http::Request& request, Time timeout)

{

// First make sure that the request is valid -- add missing mandatory fields

Request toSend(request);

if (!toSend.hasField("From"))

{

toSend.setField("From", "user@sfml-dev.org");

}

if (!toSend.hasField("User-Agent"))

{

toSend.setField("User-Agent", "libsfml-network/3.x");

}

if (!toSend.hasField("Host"))

{

toSend.setField("Host", m_hostName);

}

if (!toSend.hasField("Content-Length"))

{

std::ostringstream out;

out << toSend.m_body.size();

toSend.setField("Content-Length", out.str());

}

if ((toSend.m_method == Request::Method::Post) && !toSend.hasField("Content-Type"))

{

toSend.setField("Content-Type", "application/x-www-form-urlencoded");

}

if ((toSend.m_majorVersion * 10 + toSend.m_minorVersion >= 11) && !toSend.hasField("Connection"))

{

toSend.setField("Connection", "close");

}

// Prepare the response

Response received;

// Connect the socket to the host

if (m_connection.connect(m_host.value(), m_port, timeout) == Socket::Status::Done)

{

// Convert the request to string and send it through the connected socket

const std::string requestStr = toSend.prepare();

if (!requestStr.empty())

{

// Send it through the socket

if (m_connection.send(requestStr.c_str(), requestStr.size()) == Socket::Status::Done)

{

// Wait for the server's response

std::string receivedStr;

std::size_t size = 0;

char buffer[1024];

while (m_connection.receive(buffer, sizeof(buffer), size) == Socket::Status::Done)

{

receivedStr.append(buffer, buffer + size);

}

// Build the Response object from the received data

received.parse(receivedStr);

}

// Close the connection

m_connection.disconnect();

}

return received;

}

} // namespace sf

SFML/src/SFML/Network/Http.cpp at master · githubhy/SFML · GitHub

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