rstudio/src/cpp/core/http/Request.cpp at main · ssh352/rstudio · GitHub

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* Request.cpp

* Unless you have received this program directly from Posit Software pursuant

* to the terms of a commercial license agreement with Posit Software, then

* this program is licensed to you under the terms of version 3 of the

* GNU Affero General Public License. This program is distributed WITHOUT

* ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,

* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the

* AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.

#include <core/http/Request.hpp>

#include <core/http/URL.hpp>

#include <gsl/gsl>

#include <boost/regex.hpp>

#include <boost/tokenizer.hpp>

#include <boost/asio/buffer.hpp>

#include <boost/algorithm/string/predicate.hpp>

#include <boost/algorithm/string/join.hpp>

#include <core/Log.hpp>

#include <core/Thread.hpp>

namespace rstudio {

namespace core {

namespace http {

Request::Request()

: remoteUid_(-1),

parsedCookies_(false),

parsedFormFields_(false),

parsedQueryParams_(false)

{

}

Request::~Request()

{

}

bool Request::isSecure() const

{

// the request is secure if the browser is using HTTPS to

// reach the server which may depend on the presence of a proxy

return URL(proxiedUri()).protocol() == "https";

}

std::string Request::baseUri(BaseUriUse use /*= BaseUriUse::Internal*/) const

{

// When the root path is defined as other than the default ("/")

// we can guess with precision the actual URL show by the browser's

// address bar when we return the proxied URI. Without it either

// it doesn't matter because there's no proxy and the internal

// URI is the same address visible in the browser or the proxy is

// taking care of the path-rewrite which is something we asked

// customers to do before v1.4

if (rootPath() != kRequestDefaultRootPath)

return proxiedUri();

if (use == BaseUriUse::Internal)

return internalUri();

// When BaseUriUse::External, we omit the internal URI

return "";

}

std::string Request::internalUri() const

{

// ignore the proxy for the most part except by the scheme

std::string scheme = URL(proxiedUri()).protocol();

return scheme + "://" + host() + uri();

}

std::string Request::rootPath() const

{

// if there's no proxy defining the header resort

// to the externally defined value for root path

std::string rootPathHeader = headerValue("X-RStudio-Root-Path");

if (rootPathHeader == "")

{

rootPathHeader = rootPath_;

}

// be sure the root path start with slash but doesn't end with one (unless literally only "/")

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

rootPathHeader = '/' + rootPathHeader;

if (rootPathHeader.length() > 1 && rootPathHeader[rootPathHeader.length() - 1] == '/')

rootPathHeader = rootPathHeader.substr(0, rootPathHeader.length() - 1);

return rootPathHeader;

}

std::string firstInList(const std::string& input)

{

std::string res;

// Take the first if there's a list

std::size_t pos = input.find(',');

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

res = input.substr(0, pos);

else

res = input;

return res;

}

std::string Request::proxiedUri() const

{

// if using the product-specific header use it

// it should contain the exact scheme/host/port/path

// of the original request as send by the browser

std::string overrideHeader = headerValue("X-RStudio-Request");

if (!overrideHeader.empty())

{

return overrideHeader;

}

std::string root = rootPath();

// some internal requests may contain a virtual path any attempt to

// compose the same address as seen in browser must be include this path

std::string vPath = virtualPath();

if (!vPath.empty())

{

root += vPath;

}

// might be using new Forwarded header

std::string forwarded = headerValue("Forwarded");

if (!forwarded.empty())

{

std::string forwardedHost;

boost::regex reHost("host=([\\w.:]+);?");

boost::smatch matches;

if (boost::regex_search(forwarded, matches, reHost))

forwardedHost = matches[1];

std::string protocol = "http";

boost::regex reProto("proto=([\\w.:]+);?");

if (boost::regex_search(forwarded, matches, reProto))

protocol = matches[1];

return URL::complete(protocol + "://" + forwardedHost, root + '/' + uri());

}

// get the protocol that was specified in the request

// it might have been specified by rserver-http w/ ssl-enabled=1

std::string protocol = headerValue("X-Forwarded-Proto");

if (protocol.empty())

{

protocol = "http";

}

else

{

protocol = firstInList(protocol);

}

// might be using the legacy X-Forwarded headers

std::string forwardedHost = headerValue("X-Forwarded-Host");

if (!forwardedHost.empty())

{

forwardedHost = firstInList(forwardedHost);

// get the port that may be specified in the request

std::string port = headerValue("X-Forwarded-Port");

if (!port.empty())

{

port = firstInList(port);

std::size_t pos = forwardedHost.find(':');

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

{

forwardedHost += ":" + port;

}

else

{

forwardedHost = forwardedHost.substr(0, pos + 1) + port;

}

return URL::complete(protocol + "://" + forwardedHost, root + '/' + uri());

}

// use the protocol that may have been set by X-Forwarded-Proto

return URL::complete(protocol + "://" + host(), root + '/' + uri());

}

bool Request::acceptsContentType(const std::string& contentType) const

{

return headerValue("Accept").find(contentType) != std::string::npos;

}

bool Request::acceptsEncoding(const std::string& encoding) const

{

// read , separated fields

using namespace boost;

char_separator<char> comma(", ");

std::string accepted = acceptEncoding();

tokenizer<char_separator<char>> tokens(accepted, comma);

return std::find(tokens.begin(), tokens.end(), encoding) != tokens.end();

}

boost::posix_time::ptime Request::ifModifiedSince() const

{

using namespace boost::posix_time;

std::string modifiedSinceDate = headerValue("If-Modified-Since");

if (!modifiedSinceDate.empty())

{

return util::parseHttpDate(modifiedSinceDate);

}

else

{

return ptime(not_a_date_time);

}

std::string Request::path() const

{

std::string::size_type pos = uri().find('?');

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

return uri().substr(0, pos);

else

return uri();

}

std::string Request::queryString() const

{

// find ? in uri()

std::string::size_type pos = uri().find('?');

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

{

std::string::size_type qsPos = pos + 1;

if (uri().length() > qsPos)

return uri().substr(qsPos);

else

return std::string();

}

else

{

return std::string();

}

const Fields& Request::queryParams() const

{

if (!parsedQueryParams_)

{

util::parseQueryString(queryString(), &queryParams_);

parsedQueryParams_ = true;

}

return queryParams_;

}

std::string Request::cookieValue(const std::string& name) const

{

// parse cookies on demand

if ( !parsedCookies_ )

{

for (Headers::const_iterator it =

headers().begin(); it != headers().end(); ++it )

{

scanHeaderForCookie(it->name, it->value);

}

parsedCookies_ = true;

}

// lookup the cookie

std::string cookie = util::fieldValue(cookies_, name);

// when embedded into an iFrame a legacy cookie

// may be present for old, non-conforming browsers

if (cookie.empty())

{

cookie = util::fieldValue(cookies_, name + kLegacyCookieSuffix);

}

return cookie;

}

void Request::addCookie(const std::string& name, const std::string& value)

{

cookies_.push_back(std::make_pair(name, value));

std::vector<std::string> cookies;

for (const auto& cookie : cookies_)

{

cookies.push_back(cookie.first + "=" + cookie.second);

}

setHeader("Cookie", boost::algorithm::join(cookies, "; "));

}

std::string Request::cookieValueFromHeader(const std::string& headerName) const

{

std::string value = headerValue(headerName);

Fields cookie;

util::parseFields(value, ";, ", "= ", &cookie, util::FieldDecodeNone);

if (cookie.size() > 0)

return cookie.at(0).second;

else

return std::string();

}

std::string Request::formFieldValue(const std::string& name) const

{

ensureFormFieldsParsed();

// lookup the form field

return util::fieldValue(formFields_, name);

}

const Fields& Request::formFields() const

{

ensureFormFieldsParsed();

return formFields_;

}

const File& Request::uploadedFile(const std::string& name) const

{

ensureFormFieldsParsed();

// lookup the file

for (Files::const_iterator it = files_.begin(); it != files_.end(); ++it)

{

if (it->first == name)

return it->second;

}

// not found

return emptyFile_;

}

std::string Request::queryParamValue(const std::string& name) const

{

// lookup the query param

return util::fieldValue(queryParams(), name);

}

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

{

body_ = body;

setContentLength(gsl::narrow_cast<int>(body_.length()));

}

void Request::debugPrintUri(const std::string& caption) const

{

static boost::mutex printMutex;

LOCK_MUTEX(printMutex)

{

std::cerr << caption << ": " << uri() << std::endl;

}

END_LOCK_MUTEX

}

void Request::resetMembers()

{

method_.clear();

uri_.clear();

parsedCookies_ = false;

cookies_.clear();

parsedFormFields_ = false;

formFields_.clear();

parsedQueryParams_ = false;

queryParams_.clear();

}

void Request::appendFirstLineBuffers(

std::vector<boost::asio::const_buffer>& buffers) const

{

using boost::asio::buffer;

// request line

buffers.push_back(buffer(method_));

appendSpaceBuffer(buffers);

buffers.push_back(buffer(uri_));

appendSpaceBuffer(buffers);

appendHttpVersionBuffers(buffers);

}

void Request::ensureFormFieldsParsed() const

{

// parase form fields on demand

if ( !parsedFormFields_ )

{

std::string contentType = headerValue("Content-Type");

if (contentType == "application/x-www-form-urlencoded")

{

util::parseFields(body(),

"&",

"=",

&formFields_,

util::FieldDecodeForm);

}

else if (contentType.find("multipart/form-data") == 0)

{

util::parseMultipartForm(contentType, body(), &formFields_, &files_);

}

else

{

// no form fields available

}

parsedFormFields_ = true;

}

void Request::scanHeaderForCookie(const std::string& name,

const std::string& value) const

{

if (boost::iequals(name, "cookie"))

util::parseFields(value, ";, ", "= ", &cookies_, util::FieldDecodeNone);

}

std::ostream& operator << (std::ostream& stream, const Request& r)

{

// output request line

stream << r.method() << " "

<< r.uri()

<< " HTTP/" << r.httpVersionMajor() << "." << r.httpVersionMinor()

<< std::endl;

// output headers and body

const Message& m = r;

stream << m;

return stream;

}

} // namespacce http

} // namespace core

} // namespace rstudio

rstudio/src/cpp/core/http/Request.cpp at main · ssh352/rstudio · GitHub

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