rstudio/src/cpp/session/SessionHttpMethods.cpp at master · pearsonca/rstudio · GitHub

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* SessionHttpMethods.hpp

* Unless you have received this program directly from RStudio pursuant

* to the terms of a commercial license agreement with RStudio, 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 "SessionHttpMethods.hpp"

#include "SessionConsoleInput.hpp"

#include "SessionMainProcess.hpp"

#include "SessionSuspend.hpp"

#include "SessionClientInit.hpp"

#include "SessionInit.hpp"

#include "SessionUriHandlers.hpp"

#include "SessionDirs.hpp"

#include "SessionRpc.hpp"

#include "http/SessionTcpIpHttpConnectionListener.hpp"

#include "session-config.h"

#include <boost/algorithm/string.hpp>

#include <core/gwt/GwtLogHandler.hpp>

#include <core/gwt/GwtFileHandler.hpp>

#include <shared_core/json/Json.hpp>

#include <core/json/JsonRpc.hpp>

#include <core/system/Crypto.hpp>

#include <core/text/TemplateFilter.hpp>

#include <core/http/CSRFToken.hpp>

#include <r/RExec.hpp>

#include <r/session/RSession.hpp>

#include <r/session/REventLoop.hpp>

#include <session/RVersionSettings.hpp>

#include <session/SessionHttpConnection.hpp>

#include <session/SessionHttpConnectionListener.hpp>

#include <session/SessionModuleContext.hpp>

#include <session/SessionOptions.hpp>

#include <session/SessionPersistentState.hpp>

#include <session/SessionScopes.hpp>

#include <session/projects/SessionProjects.hpp>

#ifdef RSTUDIO_SERVER

#include <server_core/sessions/SessionSignature.hpp>

#endif

using namespace rstudio::core;

namespace rstudio {

namespace session {

namespace {

core::http::UriHandlerFunction s_defaultUriHandler;

// version of the executable -- this is the legacy version designator. we

// set it to double max so that it always invalidates legacy clients

double s_version = std::numeric_limits<double>::max();

// names of waitForMethod handlers (used to screen out of bkgnd processing)

std::vector<std::string> s_waitForMethodNames;

// url for next session

std::string s_nextSessionUrl;

boost::posix_time::ptime timeoutTimeFromNow()

{

int timeoutMinutes = options().timeoutMinutes();

if (timeoutMinutes > 0)

{

return boost::posix_time::second_clock::universal_time() +

boost::posix_time::minutes(options().timeoutMinutes());

}

else

{

return boost::posix_time::ptime(boost::posix_time::not_a_date_time);

}

void processEvents()

{

// execute safely since this can call arbitrary R code (and

// (can also cause jump_to_top if an interrupt is pending)

Error error = rstudio::r::exec::executeSafely(

rstudio::r::session::event_loop::processEvents);

if (error)

LOG_ERROR(error);

}

bool parseAndValidateJsonRpcConnection(

boost::shared_ptr<HttpConnection> ptrConnection,

json::JsonRpcRequest* pJsonRpcRequest)

{

// attempt to parse the request into a json-rpc request

Error error = json::parseJsonRpcRequest(ptrConnection->request().body(),

pJsonRpcRequest);

if (error)

{

ptrConnection->sendJsonRpcError(error);

return false;

}

// check for valid CSRF headers in server mode

if (options().programMode() == kSessionProgramModeServer &&

!core::http::validateCSRFHeaders(ptrConnection->request()))

{

ptrConnection->sendJsonRpcError(Error(json::errc::Unauthorized, ERROR_LOCATION));

return false;

}

// check for invalid client id

if (pJsonRpcRequest->clientId != persistentState().activeClientId())

{

Error error(json::errc::InvalidClientId, ERROR_LOCATION);

ptrConnection->sendJsonRpcError(error);

return false;

}

// check for legacy client version (need to invalidate any client using

// the old version field)

if ( (pJsonRpcRequest->version > 0) &&

(s_version > pJsonRpcRequest->version) )

{

Error error(json::errc::InvalidClientVersion, ERROR_LOCATION);

ptrConnection->sendJsonRpcError(error);

return false;

}

// check for client version

if (!pJsonRpcRequest->clientVersion.empty() &&

http_methods::clientVersion() != pJsonRpcRequest->clientVersion)

{

Error error(json::errc::InvalidClientVersion, ERROR_LOCATION);

ptrConnection->sendJsonRpcError(error);

return false;

}

// got through all of the validation, return true

return true;

}

void endHandleConnection(boost::shared_ptr<HttpConnection> ptrConnection,

http_methods::ConnectionType connectionType,

core::http::Response* pResponse)

{

ptrConnection->sendResponse(*pResponse);

if (!console_input::executing())

module_context::events().onDetectChanges(module_context::ChangeSourceURI);

}

bool isMethod(const std::string& uri, const std::string& method)

{

return boost::algorithm::ends_with(uri, method);

}

bool isMethod(boost::shared_ptr<HttpConnection> ptrConnection,

const std::string& method)

{

return isMethod(ptrConnection->request().uri(), method);

}

Error startHttpConnectionListener()

{

initializeHttpConnectionListener();

Error error = httpConnectionListener().start();

if (error)

return error;

if (options().standalone())

{

// log the endpoint to which we have bound to so other services can discover us

TcpIpHttpConnectionListener& listener =

static_cast<TcpIpHttpConnectionListener&>(httpConnectionListener());

boost::asio::ip::tcp::endpoint endpoint = listener.getLocalEndpoint();

std::cout << "Listener bound to address " << endpoint.address().to_string()

<< " port " << endpoint.port() << std::endl;

// set the standalone port so rpostback and others know how to

// connect back into the session process

core::system::setenv(kRSessionStandalonePortNumber, safe_convert::numberToString(endpoint.port()));

}

return Success();

}

bool isTimedOut(const boost::posix_time::ptime& timeoutTime)

{

using namespace boost::posix_time;

// never time out in desktop mode

if (options().programMode() == kSessionProgramModeDesktop)

return false;

// check for an client disconnection based timeout

int disconnectedTimeoutMinutes = options().disconnectedTimeoutMinutes();

if (disconnectedTimeoutMinutes > 0)

{

ptime lastEventConnection =

httpConnectionListener().eventsConnectionQueue().lastConnectionTime();

if (!lastEventConnection.is_not_a_date_time())

{

if ( (lastEventConnection + minutes(disconnectedTimeoutMinutes)

< second_clock::universal_time()) )

{

return true;

}

// check for a foreground inactivity based timeout

if (timeoutTime.is_not_a_date_time())

return false;

else

return second_clock::universal_time() > timeoutTime;

}

bool isWaitForMethodUri(const std::string& uri)

{

for (const std::string& methodName : s_waitForMethodNames)

{

if (isMethod(uri, methodName))

return true;

}

return false;

}

bool isJsonRpcRequest(boost::shared_ptr<HttpConnection> ptrConnection)

{

return boost::algorithm::starts_with(ptrConnection->request().uri(),

"/rpc/");

}

void polledEventHandler()

{

// if R is getting called after a fork this is likely multicore or

// some other parallel computing package that uses fork. in this

// case be defensive by shutting down as many things as we can

// which might cause mischief in the child process

if (main_process::wasForked())

{

// no more polled events

rstudio::r::session::event_loop::permanentlyDisablePolledEventHandler();

// done

return;

}

// static lastPerformed value used for throttling

using namespace boost::posix_time;

static ptime s_lastPerformed;

if (s_lastPerformed.is_not_a_date_time())

s_lastPerformed = microsec_clock::universal_time();

// throttle to no more than once every 50ms

static time_duration s_intervalMs = milliseconds(50);

if (microsec_clock::universal_time() <= (s_lastPerformed + s_intervalMs))

return;

// notify modules

module_context::onBackgroundProcessing(false);

// set last performed (should be set after calling onBackgroundProcessing so

// that long running background processing handlers can't overflow the 50ms

// interval between background processing invocations)

s_lastPerformed = microsec_clock::universal_time();

// check for a pending connections only while R is processing

// (otherwise we'll handle them directly in waitForMethod)

if (console_input::executing())

{

// check the uri of the next connection

std::string nextConnectionUri =

httpConnectionListener().mainConnectionQueue().peekNextConnectionUri();

// if the uri is empty or if it one of our special waitForMethod calls

// then bails so that the waitForMethod logic can handle it

if (nextConnectionUri.empty() || isWaitForMethodUri(nextConnectionUri))

return;

// attempt to deque a connection and handle it. for now we just handle

// a single connection at a time (we'll be called back again if processing

// continues)

boost::shared_ptr<HttpConnection> ptrConnection =

httpConnectionListener().mainConnectionQueue().dequeConnection();

if (ptrConnection)

{

if ( isMethod(ptrConnection, kClientInit) )

{

// client_init means the user is attempting to reload the browser

// in the middle of a computation. process client_init and post

// a busy event as our initFunction

using namespace session::module_context;

ClientEvent busyEvent(client_events::kBusy, true);

client_init::handleClientInit(

boost::bind(enqueClientEvent, busyEvent), ptrConnection);

}

else

{

handleConnection(ptrConnection, http_methods::BackgroundConnection);

}

bool registeredWaitForMethod(const std::string& method,

const ClientEvent& event,

core::json::JsonRpcRequest* pRequest)

{

// enque the event which notifies the client we want input

module_context::enqueClientEvent(event);

// wait for method

return http_methods::waitForMethod(method,

boost::bind(http_methods::waitForMethodInitFunction,

event),

suspend::disallowSuspend,

pRequest);

}

bool verifyRequestSignature(const core::http::Request& request)

{

#ifndef RSTUDIO_SERVER

// signatures only supported in server mode - requires a dependency

// on server_core, which is only available to server platforms

return true;

#else

// only verify signatures if we are in standalone mode and

// we are explicitly configured to verify signatures

if (!options().verifySignatures() || !options().standalone())

return true;

// determine which signing key pair to use

// we use an automatically generated key for postback requests

// (since we do not have access to the private key of rserver)

std::string signingKey = options().signingKey();

if (request.headerValue("X-Session-Postback") == "1")

signingKey = options().sessionRsaPublicKey();

// ensure specified signature is valid

// note: we do not validate the signing username if we are running in a root container

Error error = !core::system::effectiveUserIsRoot() ?

server_core::sessions::verifyRequestSignature(signingKey, core::system::username(), request) :

server_core::sessions::verifyRequestSignature(signingKey, request);

if (error)

{

LOG_ERROR(error);

return false;

}

return true;

#endif

}

} // anonymous namespace

namespace module_context

{

module_context::WaitForMethodFunction registerWaitForMethod(

const std::string& methodName)

{

s_waitForMethodNames.push_back(methodName);

return boost::bind(registeredWaitForMethod, methodName, _2, _1);

}

} // namespace module_context

namespace http_methods {

// client version -- this is determined by the git revision hash. the client

// and the server can diverge if a new version of the server was installed

// underneath a previously rendered client. if versions diverge then a reload

// of the client is forced

std::string clientVersion()

{

// never return a version in desktop mode

if (options().programMode() == kSessionProgramModeDesktop)

return std::string();

// never return a version in standalone mode

if (options().standalone())

return std::string();

// clientVersion is the git revision hash

return RSTUDIO_GIT_REVISION_HASH;

}

void waitForMethodInitFunction(const ClientEvent& initEvent)

{

module_context::enqueClientEvent(initEvent);

if (console_input::executing())

{

ClientEvent busyEvent(client_events::kBusy, true);

module_context::enqueClientEvent(busyEvent);

}

else

{

console_input::reissueLastConsolePrompt();

}

// wait for the specified method. will either:

// - return true and the method request in pRequest

// - return false indicating failure (e.g. called after fork in child)

// - suspend or quit the process

// exit the process as a result of suspend or quit)

bool waitForMethod(const std::string& method,

const boost::function<void()>& initFunction,

const boost::function<bool()>& allowSuspend,

core::json::JsonRpcRequest* pRequest)

{

if (main_process::wasForked())

{

LOG_ERROR_MESSAGE("Waiting for method " + method + " after fork");

return false;

}

// establish timeouts

boost::posix_time::ptime timeoutTime = timeoutTimeFromNow();

boost::posix_time::time_duration connectionQueueTimeout =

boost::posix_time::milliseconds(50);

// wait until we get the method we are looking for

while(true)

{

// suspend if necessary (does not return if a suspend occurs)

suspend::suspendIfRequested(allowSuspend);

// check for timeout

if ( isTimedOut(timeoutTime) )

{

if (allowSuspend())

{

// note that we timed out

suspend::setSuspendedFromTimeout(true);

if (!options().timeoutSuspend())

{

// configuration dictates that we should quit the

// session instead of suspending when timeout occurs

// the conditions for the quit must be the same as those

// for a regular suspend

rstudio::r::session::quit(false, EXIT_SUCCESS); // does not return

return false;

}

// attempt to suspend (does not return if it succeeds)

if (!suspend::suspendSession(false))

{

// reset timeout flag

suspend::setSuspendedFromTimeout(false);

// if it fails then reset the timeout timer so we don't keep

// hammering away on the failure case

timeoutTime = timeoutTimeFromNow();

}

// if we have at least one async process running then this counts

// as "activity" and resets the timeout timer

if (main_process::haveActiveChildren())

timeoutTime = timeoutTimeFromNow();

// look for a connection (waiting for the specified interval)

boost::shared_ptr<HttpConnection> ptrConnection =

httpConnectionListener().mainConnectionQueue().dequeConnection(

connectionQueueTimeout);

// perform background processing (true for isIdle)

module_context::onBackgroundProcessing(true);

// process pending events

processEvents();

if (ptrConnection)

{

// ensure request signature is valid

if (!verifyRequestSignature(ptrConnection->request()))

{

LOG_ERROR_MESSAGE("Invalid signature for request URI " + ptrConnection->request().uri());

core::http::Response response;

response.setError(http::status::Unauthorized, "Invalid message signature");

ptrConnection->sendResponse(response);

continue;

}

// check for client_init

if ( isMethod(ptrConnection, kClientInit) )

{

client_init::handleClientInit(initFunction, ptrConnection);

}

// check for the method we are waiting on

else if ( isMethod(ptrConnection, method) )

{

// parse and validate request then proceed

if (parseAndValidateJsonRpcConnection(ptrConnection, pRequest))

{

// respond to the method

ptrConnection->sendJsonRpcResponse();

// ensure initialized

init::ensureSessionInitialized();

break; // got the method, we are out of here!

}

// another connection type, dispatch it

else

{

handleConnection(ptrConnection, ForegroundConnection);

}

// since we got a connection we can reset the timeout time

timeoutTime = timeoutTimeFromNow();

// after we've processed at least one waitForMethod it is now safe to

// initialize the polledEventHandler (which is used to maintain rsession

// responsiveness even when R is executing code received at the console).

// we defer this to make sure that the FIRST request is always handled

// by the logic above. if we didn't do this then client_init or

// console_input (often the first request) could go directly to

// handleConnection which wouldn't know what to do with them

if (!rstudio::r::session::event_loop::polledEventHandlerInitialized())

rstudio::r::session::event_loop::initializePolledEventHandler(

polledEventHandler);

}

// satisfied the request

return true;

}

// wait for the specified method (will either return the method or

// exit the process as a result of suspend or quit)

bool waitForMethod(const std::string& method,

const ClientEvent& initEvent,

const boost::function<bool()>& allowSuspend,

core::json::JsonRpcRequest* pRequest)

{

return waitForMethod(method,

boost::bind(module_context::enqueClientEvent,

initEvent),

allowSuspend,

pRequest);

}

void handleConnection(boost::shared_ptr<HttpConnection> ptrConnection,

ConnectionType connectionType)

{

// check for a uri handler registered by a module

const core::http::Request& request = ptrConnection->request();

std::string uri = request.uri();

boost::optional<core::http::UriAsyncHandlerFunctionVariant> uriHandler =

uri_handlers::handlers().handlerFor(uri);

if (uriHandler) // uri handler

{

core::http::visitHandler(uriHandler.get(),

request,

boost::bind(endHandleConnection,

ptrConnection,

connectionType,

_1));

// r code may execute - ensure session is initialized

init::ensureSessionInitialized();

}

else if (isJsonRpcRequest(ptrConnection)) // check for json-rpc

{

// r code may execute - ensure session is initialized

init::ensureSessionInitialized();

// attempt to parse & validate

json::JsonRpcRequest jsonRpcRequest;

if (parseAndValidateJsonRpcConnection(ptrConnection, &jsonRpcRequest))

{

// quit_session: exit process

if (jsonRpcRequest.method == kQuitSession)

{

#ifdef _WIN32

// if we are on windows then we can't quit while the browser

// context is active

if (rstudio::r::session::browserContextActive())

{

module_context::consoleWriteError(

"Error: unable to quit when browser is active\n");

json::JsonRpcResponse response;

response.setResult(false);

ptrConnection->sendJsonRpcResponse(response);

return;

}

#endif

// see whether we should save the workspace

bool saveWorkspace = true;

std::string switchToProject, hostPageUrl;

json::Value switchToVersionJson;

Error error = json::readParams(jsonRpcRequest.params,

&saveWorkspace,

&switchToProject,

&switchToVersionJson,

&hostPageUrl) ;

if (error)

LOG_ERROR(error);

// note switch to project

if (!switchToProject.empty())

{

// if we don't have a project file then create it (can

// occur when e.g. opening a project from a directory for

// which we don't yet have a .Rproj file)

if (switchToProject != kProjectNone)

{

FilePath projFile = module_context::resolveAliasedPath(switchToProject);

if (projFile.getParent().exists() && !projFile.exists())

{

Error error = r_util::writeProjectFile(

projFile,

projects::ProjectContext::buildDefaults(),

projects::ProjectContext::defaultConfig());

if (error)

LOG_ERROR(error);

}

// update project and working dir

using namespace module_context;

if (switchToProject == kProjectNone)

{

// update the project and working dir

activeSession().setProject(kProjectNone);

activeSession().setWorkingDir(

createAliasedPath(dirs::getDefaultWorkingDirectory()));

}

else

{

FilePath projFile = module_context::resolveAliasedPath(switchToProject);

std::string projDir = createAliasedPath(projFile.getParent());

activeSession().setProject(projDir);

activeSession().setWorkingDir(projDir);

}

if (options().switchProjectsWithUrl())

{

r_util::SessionScope scope;

if (switchToProject == kProjectNone)

{

scope = r_util::SessionScope::projectNone(

options().sessionScope().id());

}

else

{

// extract the directory (aliased)

using namespace module_context;

FilePath projFile = module_context::resolveAliasedPath(switchToProject);

std::string projDir = createAliasedPath(projFile.getParent());

scope = r_util::SessionScope::fromProject(

projDir,

options().sessionScope().id(),

filePathToProjectId(options().userScratchPath(),

FilePath(options().getOverlayOption(

kSessionSharedStoragePath))));

}

// set next session url

s_nextSessionUrl = r_util::createSessionUrl(hostPageUrl,

scope);

}

else

{

projects::ProjectsSettings(options().userScratchPath()).

setSwitchToProjectPath(switchToProject);

}

// note switch to R version if requested

if (json::isType<json::Object>(switchToVersionJson))

{

using namespace module_context;

std::string version, rHome, label;

Error error = json::readObject(

switchToVersionJson.getObject(),

"version", &version,

"r_home", &rHome,

"label", &label);

if (!error)

{

// set version for active session

activeSession().setRVersion(version, rHome, label);

// if we had a project directory as well then

// set it's version (this is necessary because

// project versions override session versions)

if (switchToProject != kProjectNone)

{

FilePath projFile = resolveAliasedPath(switchToProject);

std::string projDir = createAliasedPath(projFile.getParent());

RVersionSettings verSettings(

options().userScratchPath(),

FilePath(options().getOverlayOption(

kSessionSharedStoragePath)));

verSettings.setProjectLastRVersion(projDir,

module_context::sharedProjectScratchPath(),

version,

rHome,

label);

}

else

LOG_ERROR(error);

}

// exit status

int status = switchToProject.empty() ? EXIT_SUCCESS : EX_CONTINUE;

// acknowledge request & quit session

json::JsonRpcResponse response;

response.setResult(true);

ptrConnection->sendJsonRpcResponse(response);

rstudio::r::session::quit(saveWorkspace, status); // does not return

}

else if (jsonRpcRequest.method == kSuspendSession)

{

// check for force

bool force = true;

Error error = json::readParams(jsonRpcRequest.params, &force);

if (error)

LOG_ERROR(error);

// acknowledge request and set flags to suspend session

ptrConnection->sendJsonRpcResponse();

if (force)

suspend::handleUSR2(0);

else

suspend::handleUSR1(0);

}

// interrupt

else if ( jsonRpcRequest.method == kInterrupt )

{

// Discard any buffered input

console_input::clearConsoleInputBuffer();

// aknowledge request

ptrConnection->sendJsonRpcResponse();

// only accept interrupts while R is processing input

if (console_input::executing())

rstudio::r::exec::setInterruptsPending(true);

}

// other rpc method, handle it

else

{

jsonRpcRequest.isBackgroundConnection =

(connectionType == BackgroundConnection);

rpc::handleRpcRequest(jsonRpcRequest, ptrConnection, connectionType);

}

else if (s_defaultUriHandler)

{

core::http::Response response;

s_defaultUriHandler(request, &response);

ptrConnection->sendResponse(response);

}

else

{

core::http::Response response;

response.setNotFoundError(request);

ptrConnection->sendResponse(response);

}

WaitResult startHttpConnectionListenerWithTimeout()

{

Error error = startHttpConnectionListener();

// When the rsession restarts, it may take a few ms for the port to become

// available; therefore, retry connection, but only for address_in_use error

if (!error)

return WaitResult(WaitSuccess, Success());

else if (error != boost::system::error_code(boost::system::errc::address_in_use, boost::system::generic_category()))

return WaitResult(WaitError, error);

else

return WaitResult(WaitContinue, error);

}

void registerGwtHandlers()

{

// alias options

session::Options& options = session::options();

// establish logging handler

module_context::registerUriHandler(

"/log",

boost::bind(gwt::handleLogRequest, options.userIdentity(), _1, _2));

// establish progress handler

FilePath wwwPath(options.wwwLocalPath());

FilePath progressPagePath = wwwPath.completePath("progress.htm");

module_context::registerUriHandler(

"/progress",

boost::bind(text::handleTemplateRequest, progressPagePath, _1, _2));

// initialize gwt symbol maps

gwt::initializeSymbolMaps(options.wwwSymbolMapsPath());

// declare program mode in JS init block (for GWT boot time access)

std::string initJs = "window.program_mode = \"" + options.programMode() + "\";\n";

// set default handler

s_defaultUriHandler = gwt::fileHandlerFunction(options.wwwLocalPath(), options.useSecureCookies(), "/",

http::UriFilterFunction(), initJs);

}

std::string nextSessionUrl()

{

return s_nextSessionUrl;

}

} // namespace http_methods

} // namespace session

} // namespace rstudio

rstudio/src/cpp/session/SessionHttpMethods.cpp at master · pearsonca/rstudio · GitHub

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