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|
/*
* Copyright (C) 2005-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "WebServer.h"
#include "CompileInfo.h"
#include "ServiceBroker.h"
#include "XBDateTime.h"
#include "filesystem/File.h"
#include "network/httprequesthandler/HTTPRequestHandlerUtils.h"
#include "network/httprequesthandler/IHTTPRequestHandler.h"
#include "settings/Settings.h"
#include "settings/SettingsComponent.h"
#include "utils/FileUtils.h"
#include "utils/Mime.h"
#include "utils/StringUtils.h"
#include "utils/URIUtils.h"
#include "utils/Variant.h"
#include "utils/log.h"
#include <algorithm>
#include <memory>
#include <mutex>
#include <stdexcept>
#include <utility>
#if defined(TARGET_POSIX)
#include <pthread.h>
#endif
#include <inttypes.h>
#define MAX_POST_BUFFER_SIZE 2048
#define PAGE_FILE_NOT_FOUND \
"<html><head><title>File not found</title></head><body>File not found</body></html>"
#define NOT_SUPPORTED \
"<html><head><title>Not Supported</title></head><body>The method you are trying to use is not " \
"supported by this server</body></html>"
#define HEADER_VALUE_NO_CACHE "no-cache"
#define HEADER_NEWLINE "\r\n"
typedef struct
{
std::shared_ptr<XFILE::CFile> file;
CHttpRanges ranges;
size_t rangeCountTotal;
std::string boundary;
std::string boundaryWithHeader;
std::string boundaryEnd;
bool boundaryWritten;
std::string contentType;
uint64_t writePosition;
} HttpFileDownloadContext;
CWebServer::CWebServer()
: m_authenticationUsername("kodi"),
m_authenticationPassword(""),
m_key(),
m_cert(),
m_logger(CServiceBroker::GetLogging().GetLogger("CWebServer"))
{
#if defined(TARGET_DARWIN)
void* stack_addr;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_getstack(&attr, &stack_addr, &m_thread_stacksize);
pthread_attr_destroy(&attr);
// double the stack size under darwin, not sure why yet
// but it stopped crashing using Kodi iOS remote -> play video.
// non-darwin will pass a value of zero which means 'system default'
m_thread_stacksize *= 2;
m_logger->debug("increasing thread stack to {}", m_thread_stacksize);
#endif
}
static MHD_Response* create_response(size_t size, const void* data, int free, int copy)
{
MHD_ResponseMemoryMode mode = MHD_RESPMEM_PERSISTENT;
if (copy)
mode = MHD_RESPMEM_MUST_COPY;
else if (free)
mode = MHD_RESPMEM_MUST_FREE;
//! @bug libmicrohttpd isn't const correct
return MHD_create_response_from_buffer(size, const_cast<void*>(data), mode);
}
MHD_RESULT CWebServer::AskForAuthentication(const HTTPRequest& request) const
{
struct MHD_Response* response = create_response(0, nullptr, MHD_NO, MHD_NO);
if (!response)
{
m_logger->error("unable to create HTTP Unauthorized response");
return MHD_NO;
}
MHD_RESULT ret = AddHeader(response, MHD_HTTP_HEADER_CONNECTION, "close");
if (!ret)
{
m_logger->error("unable to prepare HTTP Unauthorized response");
MHD_destroy_response(response);
return MHD_NO;
}
LogResponse(request, MHD_HTTP_UNAUTHORIZED);
// This MHD_RESULT cast is only necessary for libmicrohttpd 0.9.71
// The return type of MHD_queue_basic_auth_fail_response was fixed for future versions
// See
// https://git.gnunet.org/libmicrohttpd.git/commit/?id=860b42e9180da4dcd7e8690a3fcdb4e37e5772c5
ret = static_cast<MHD_RESULT>(
MHD_queue_basic_auth_fail_response(request.connection, CCompileInfo::GetAppName(), response));
MHD_destroy_response(response);
return ret;
}
bool CWebServer::IsAuthenticated(const HTTPRequest& request) const
{
std::unique_lock<CCriticalSection> lock(m_critSection);
if (!m_authenticationRequired)
return true;
// try to retrieve username and password for basic authentication
char* password = nullptr;
char* username = MHD_basic_auth_get_username_password(request.connection, &password);
if (username == nullptr || password == nullptr)
return false;
// compare the received username and password
bool authenticated = m_authenticationUsername.compare(username) == 0 &&
m_authenticationPassword.compare(password) == 0;
free(username);
free(password);
return authenticated;
}
MHD_RESULT CWebServer::AnswerToConnection(void* cls,
struct MHD_Connection* connection,
const char* url,
const char* method,
const char* version,
const char* upload_data,
size_t* upload_data_size,
void** con_cls)
{
if (cls == nullptr || con_cls == nullptr || *con_cls == nullptr)
{
GetLogger()->error("invalid request received");
return MHD_NO;
}
CWebServer* webServer = reinterpret_cast<CWebServer*>(cls);
ConnectionHandler* connectionHandler = reinterpret_cast<ConnectionHandler*>(*con_cls);
HTTPMethod methodType = GetHTTPMethod(method);
HTTPRequest request = {webServer, connection, connectionHandler->fullUri, url, methodType,
version, {}};
if (connectionHandler->isNew)
webServer->LogRequest(request);
return webServer->HandlePartialRequest(connection, connectionHandler, request, upload_data,
upload_data_size, con_cls);
}
MHD_RESULT CWebServer::HandlePartialRequest(struct MHD_Connection* connection,
ConnectionHandler* connectionHandler,
const HTTPRequest& request,
const char* upload_data,
size_t* upload_data_size,
void** con_cls)
{
std::unique_ptr<ConnectionHandler> conHandler(connectionHandler);
// remember if the request was new
bool isNewRequest = conHandler->isNew;
// because now it isn't anymore
conHandler->isNew = false;
// reset con_cls and set it if still necessary
*con_cls = nullptr;
if (!IsAuthenticated(request))
return AskForAuthentication(request);
// check if this is the first call to AnswerToConnection for this request
if (isNewRequest)
{
// look for a IHTTPRequestHandler which can take care of the current request
auto handler = FindRequestHandler(request);
if (handler != nullptr)
{
// if we got a GET request we need to check if it should be cached
if (request.method == GET || request.method == HEAD)
{
if (handler->CanBeCached())
{
bool cacheable = IsRequestCacheable(request);
CDateTime lastModified;
if (handler->GetLastModifiedDate(lastModified) && lastModified.IsValid())
{
// handle If-Modified-Since or If-Unmodified-Since
std::string ifModifiedSince = HTTPRequestHandlerUtils::GetRequestHeaderValue(
connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_IF_MODIFIED_SINCE);
std::string ifUnmodifiedSince = HTTPRequestHandlerUtils::GetRequestHeaderValue(
connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_IF_UNMODIFIED_SINCE);
CDateTime ifModifiedSinceDate;
CDateTime ifUnmodifiedSinceDate;
// handle If-Modified-Since (but only if the response is cacheable)
if (cacheable && ifModifiedSinceDate.SetFromRFC1123DateTime(ifModifiedSince) &&
lastModified.GetAsUTCDateTime() <= ifModifiedSinceDate)
{
struct MHD_Response* response = create_response(0, nullptr, MHD_NO, MHD_NO);
if (response == nullptr)
{
m_logger->error("failed to create a HTTP 304 response");
return MHD_NO;
}
return FinalizeRequest(handler, MHD_HTTP_NOT_MODIFIED, response);
}
// handle If-Unmodified-Since
else if (ifUnmodifiedSinceDate.SetFromRFC1123DateTime(ifUnmodifiedSince) &&
lastModified.GetAsUTCDateTime() > ifUnmodifiedSinceDate)
return SendErrorResponse(request, MHD_HTTP_PRECONDITION_FAILED, request.method);
}
// pass the requested ranges on to the request handler
handler->SetRequestRanged(IsRequestRanged(request, lastModified));
}
}
// if we got a POST request we need to take care of the POST data
else if (request.method == POST)
{
// as ownership of the connection handler is passed to libmicrohttpd we must not destroy it
SetupPostDataProcessing(request, conHandler.get(), handler, con_cls);
// as ownership of the connection handler has been passed to libmicrohttpd we must not
// destroy it
conHandler.release();
return MHD_YES;
}
return HandleRequest(handler);
}
}
// this is a subsequent call to AnswerToConnection for this request
else
{
// again we need to take special care of the POST data
if (request.method == POST)
{
// process additional / remaining POST data
if (ProcessPostData(request, conHandler.get(), upload_data, upload_data_size, con_cls))
{
// as ownership of the connection handler has been passed to libmicrohttpd we must not
// destroy it
conHandler.release();
return MHD_YES;
}
// finalize POST data processing
FinalizePostDataProcessing(conHandler.get());
// check if something went wrong while handling the POST data
if (conHandler->errorStatus != MHD_HTTP_OK)
return SendErrorResponse(request, conHandler->errorStatus, request.method);
// we have handled all POST data so it's time to invoke the IHTTPRequestHandler
return HandleRequest(conHandler->requestHandler);
}
// it's unusual to get more than one call to AnswerToConnection for none-POST requests, but
// let's handle it anyway
auto requestHandler = FindRequestHandler(request);
if (requestHandler != nullptr)
return HandleRequest(requestHandler);
}
m_logger->error("couldn't find any request handler for {}", request.pathUrl);
return SendErrorResponse(request, MHD_HTTP_NOT_FOUND, request.method);
}
MHD_RESULT CWebServer::HandlePostField(void* cls,
enum MHD_ValueKind kind,
const char* key,
const char* filename,
const char* content_type,
const char* transfer_encoding,
const char* data,
uint64_t off,
size_t size)
{
ConnectionHandler* conHandler = (ConnectionHandler*)cls;
if (conHandler == nullptr || conHandler->requestHandler == nullptr || key == nullptr ||
data == nullptr || size == 0)
{
GetLogger()->error("unable to handle HTTP POST field");
return MHD_NO;
}
conHandler->requestHandler->AddPostField(key, std::string(data, size));
return MHD_YES;
}
MHD_RESULT CWebServer::HandleRequest(const std::shared_ptr<IHTTPRequestHandler>& handler)
{
if (handler == nullptr)
return MHD_NO;
HTTPRequest request = handler->GetRequest();
MHD_RESULT ret = handler->HandleRequest();
if (ret == MHD_NO)
{
m_logger->error("failed to handle HTTP request for {}", request.pathUrl);
return SendErrorResponse(request, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);
}
const HTTPResponseDetails& responseDetails = handler->GetResponseDetails();
struct MHD_Response* response = nullptr;
switch (responseDetails.type)
{
case HTTPNone:
m_logger->error("HTTP request handler didn't process {}", request.pathUrl);
return MHD_NO;
case HTTPRedirect:
ret = CreateRedirect(request.connection, handler->GetRedirectUrl(), response);
break;
case HTTPFileDownload:
ret = CreateFileDownloadResponse(handler, response);
break;
case HTTPMemoryDownloadNoFreeNoCopy:
case HTTPMemoryDownloadNoFreeCopy:
case HTTPMemoryDownloadFreeNoCopy:
case HTTPMemoryDownloadFreeCopy:
ret = CreateMemoryDownloadResponse(handler, response);
break;
case HTTPError:
ret =
CreateErrorResponse(request.connection, responseDetails.status, request.method, response);
break;
default:
m_logger->error("internal error while HTTP request handler processed {}", request.pathUrl);
return SendErrorResponse(request, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);
}
if (ret == MHD_NO)
{
m_logger->error("failed to create HTTP response for {}", request.pathUrl);
return SendErrorResponse(request, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);
}
return FinalizeRequest(handler, responseDetails.status, response);
}
MHD_RESULT CWebServer::FinalizeRequest(const std::shared_ptr<IHTTPRequestHandler>& handler,
int responseStatus,
struct MHD_Response* response)
{
if (handler == nullptr || response == nullptr)
return MHD_NO;
const HTTPRequest& request = handler->GetRequest();
const HTTPResponseDetails& responseDetails = handler->GetResponseDetails();
// if the request handler has set a content type and it hasn't been set as a header, add it
if (!responseDetails.contentType.empty())
handler->AddResponseHeader(MHD_HTTP_HEADER_CONTENT_TYPE, responseDetails.contentType);
// if the request handler has set a last modified date and it hasn't been set as a header, add it
CDateTime lastModified;
if (handler->GetLastModifiedDate(lastModified) && lastModified.IsValid())
handler->AddResponseHeader(MHD_HTTP_HEADER_LAST_MODIFIED, lastModified.GetAsRFC1123DateTime());
// check if the request handler has set Cache-Control and add it if not
if (!handler->HasResponseHeader(MHD_HTTP_HEADER_CACHE_CONTROL))
{
int maxAge = handler->GetMaximumAgeForCaching();
if (handler->CanBeCached() && maxAge == 0 && !responseDetails.contentType.empty())
{
// don't cache HTML, CSS and JavaScript files
if (!StringUtils::EqualsNoCase(responseDetails.contentType, "text/html") &&
!StringUtils::EqualsNoCase(responseDetails.contentType, "text/css") &&
!StringUtils::EqualsNoCase(responseDetails.contentType, "application/javascript"))
maxAge = CDateTimeSpan(365, 0, 0, 0).GetSecondsTotal();
}
// if the response can't be cached or the maximum age is 0 force the client not to cache
if (!handler->CanBeCached() || maxAge == 0)
handler->AddResponseHeader(MHD_HTTP_HEADER_CACHE_CONTROL,
"private, max-age=0, " HEADER_VALUE_NO_CACHE);
else
{
// create the value of the Cache-Control header
std::string cacheControl = StringUtils::Format("public, max-age={}", maxAge);
// check if the response contains a Set-Cookie header because they must not be cached
if (handler->HasResponseHeader(MHD_HTTP_HEADER_SET_COOKIE))
cacheControl += ", no-cache=\"set-cookie\"";
// set the Cache-Control header
handler->AddResponseHeader(MHD_HTTP_HEADER_CACHE_CONTROL, cacheControl);
// set the Expires header
CDateTime expiryTime = CDateTime::GetCurrentDateTime() + CDateTimeSpan(0, 0, 0, maxAge);
handler->AddResponseHeader(MHD_HTTP_HEADER_EXPIRES, expiryTime.GetAsRFC1123DateTime());
}
}
// if the request handler can handle ranges and it hasn't been set as a header, add it
if (handler->CanHandleRanges())
handler->AddResponseHeader(MHD_HTTP_HEADER_ACCEPT_RANGES, "bytes");
else
handler->AddResponseHeader(MHD_HTTP_HEADER_ACCEPT_RANGES, "none");
// add all headers set by the request handler
for (const auto& it : responseDetails.headers)
AddHeader(response, it.first, it.second);
return SendResponse(request, responseStatus, response);
}
std::shared_ptr<IHTTPRequestHandler> CWebServer::FindRequestHandler(
const HTTPRequest& request) const
{
// look for a IHTTPRequestHandler which can take care of the current request
auto requestHandlerIt = std::find_if(m_requestHandlers.cbegin(), m_requestHandlers.cend(),
[&request](const IHTTPRequestHandler* requestHandler) {
return requestHandler->CanHandleRequest(request);
});
// we found a matching IHTTPRequestHandler so let's get a new instance for this request
if (requestHandlerIt != m_requestHandlers.cend())
return std::shared_ptr<IHTTPRequestHandler>((*requestHandlerIt)->Create(request));
return nullptr;
}
bool CWebServer::IsRequestCacheable(const HTTPRequest& request) const
{
// handle Cache-Control
std::string cacheControl = HTTPRequestHandlerUtils::GetRequestHeaderValue(
request.connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_CACHE_CONTROL);
if (!cacheControl.empty())
{
std::vector<std::string> cacheControls = StringUtils::Split(cacheControl, ",");
for (auto control : cacheControls)
{
control = StringUtils::Trim(control);
// handle no-cache
if (control.compare(HEADER_VALUE_NO_CACHE) == 0)
return false;
}
}
// handle Pragma
std::string pragma = HTTPRequestHandlerUtils::GetRequestHeaderValue(
request.connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_PRAGMA);
if (pragma.compare(HEADER_VALUE_NO_CACHE) == 0)
return false;
return true;
}
bool CWebServer::IsRequestRanged(const HTTPRequest& request, const CDateTime& lastModified) const
{
// parse the Range header and store it in the request object
CHttpRanges ranges;
bool ranged = ranges.Parse(HTTPRequestHandlerUtils::GetRequestHeaderValue(
request.connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_RANGE));
// handle If-Range header but only if the Range header is present
if (ranged && lastModified.IsValid())
{
std::string ifRange = HTTPRequestHandlerUtils::GetRequestHeaderValue(
request.connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_IF_RANGE);
if (!ifRange.empty() && lastModified.IsValid())
{
CDateTime ifRangeDate;
ifRangeDate.SetFromRFC1123DateTime(ifRange);
// check if the last modification is newer than the If-Range date
// if so we have to server the whole file instead
if (lastModified.GetAsUTCDateTime() > ifRangeDate)
ranges.Clear();
}
}
return !ranges.IsEmpty();
}
void CWebServer::SetupPostDataProcessing(const HTTPRequest& request,
ConnectionHandler* connectionHandler,
std::shared_ptr<IHTTPRequestHandler> handler,
void** con_cls) const
{
connectionHandler->requestHandler = std::move(handler);
// we might need to handle the POST data ourselves which is done in the next call to
// AnswerToConnection
*con_cls = connectionHandler;
// get the content-type of the POST data
const auto contentType = HTTPRequestHandlerUtils::GetRequestHeaderValue(
request.connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_CONTENT_TYPE);
if (contentType.empty())
return;
// if the content-type is neither application/x-ww-form-urlencoded nor multipart/form-data we need
// to handle it ourselves
if (!StringUtils::EqualsNoCase(contentType, MHD_HTTP_POST_ENCODING_FORM_URLENCODED) &&
!StringUtils::EqualsNoCase(contentType, MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA))
return;
// otherwise we can use MHD's POST processor
connectionHandler->postprocessor = MHD_create_post_processor(
request.connection, MAX_POST_BUFFER_SIZE, &CWebServer::HandlePostField,
static_cast<void*>(connectionHandler));
// MHD doesn't seem to be able to handle this post request
if (connectionHandler->postprocessor == nullptr)
{
m_logger->error("unable to create HTTP POST processor for {}", request.pathUrl);
connectionHandler->errorStatus = MHD_HTTP_INTERNAL_SERVER_ERROR;
}
}
bool CWebServer::ProcessPostData(const HTTPRequest& request,
ConnectionHandler* connectionHandler,
const char* upload_data,
size_t* upload_data_size,
void** con_cls) const
{
if (connectionHandler->requestHandler == nullptr)
{
m_logger->error("cannot handle partial HTTP POST for {} request because there is no valid "
"request handler available",
request.pathUrl);
connectionHandler->errorStatus = MHD_HTTP_INTERNAL_SERVER_ERROR;
}
// we only need to handle POST data if there actually is data left to handle
if (*upload_data_size == 0)
return false;
// we may need to handle more POST data which is done in the next call to AnswerToConnection
*con_cls = connectionHandler;
// if nothing has gone wrong so far, process the given POST data
if (connectionHandler->errorStatus == MHD_HTTP_OK)
{
bool postDataHandled = false;
// either use MHD's POST processor
if (connectionHandler->postprocessor != nullptr)
postDataHandled = MHD_post_process(connectionHandler->postprocessor, upload_data,
*upload_data_size) == MHD_YES;
// or simply copy the data to the handler
else if (connectionHandler->requestHandler != nullptr)
postDataHandled =
connectionHandler->requestHandler->AddPostData(upload_data, *upload_data_size);
// abort if the received POST data couldn't be handled
if (!postDataHandled)
{
m_logger->error("failed to handle HTTP POST data for {}", request.pathUrl);
#if (MHD_VERSION >= 0x00097400)
connectionHandler->errorStatus = MHD_HTTP_CONTENT_TOO_LARGE;
#elif (MHD_VERSION >= 0x00095213)
connectionHandler->errorStatus = MHD_HTTP_PAYLOAD_TOO_LARGE;
#else
connectionHandler->errorStatus = MHD_HTTP_REQUEST_ENTITY_TOO_LARGE;
#endif
}
}
// signal that we have handled the data
*upload_data_size = 0;
return true;
}
void CWebServer::FinalizePostDataProcessing(ConnectionHandler* connectionHandler) const
{
if (connectionHandler->postprocessor == nullptr)
return;
MHD_destroy_post_processor(connectionHandler->postprocessor);
}
MHD_RESULT CWebServer::CreateMemoryDownloadResponse(
const std::shared_ptr<IHTTPRequestHandler>& handler, struct MHD_Response*& response) const
{
if (handler == nullptr)
return MHD_NO;
const HTTPRequest& request = handler->GetRequest();
const HTTPResponseDetails& responseDetails = handler->GetResponseDetails();
HttpResponseRanges responseRanges = handler->GetResponseData();
// check if the response is completely empty
if (responseRanges.empty())
return CreateMemoryDownloadResponse(request.connection, nullptr, 0, false, false, response);
// check if the response contains more ranges than the request asked for
if ((request.ranges.IsEmpty() && responseRanges.size() > 1) ||
(!request.ranges.IsEmpty() && responseRanges.size() > request.ranges.Size()))
{
m_logger->warn("response contains more ranges ({}) than the request asked for ({})",
static_cast<int>(responseRanges.size()),
static_cast<int>(request.ranges.Size()));
return SendErrorResponse(request, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);
}
// if the request asked for no or only one range we can simply use MHDs memory download handler
// we MUST NOT send a multipart response
if (request.ranges.Size() <= 1)
{
CHttpResponseRange responseRange = responseRanges.front();
// check if the range is valid
if (!responseRange.IsValid())
{
m_logger->warn("invalid response data with range start at {} and end at {}",
responseRange.GetFirstPosition(), responseRange.GetLastPosition());
return SendErrorResponse(request, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);
}
const void* responseData = responseRange.GetData();
size_t responseDataLength = static_cast<size_t>(responseRange.GetLength());
switch (responseDetails.type)
{
case HTTPMemoryDownloadNoFreeNoCopy:
return CreateMemoryDownloadResponse(request.connection, responseData, responseDataLength,
false, false, response);
case HTTPMemoryDownloadNoFreeCopy:
return CreateMemoryDownloadResponse(request.connection, responseData, responseDataLength,
false, true, response);
case HTTPMemoryDownloadFreeNoCopy:
return CreateMemoryDownloadResponse(request.connection, responseData, responseDataLength,
true, false, response);
case HTTPMemoryDownloadFreeCopy:
return CreateMemoryDownloadResponse(request.connection, responseData, responseDataLength,
true, true, response);
default:
return SendErrorResponse(request, MHD_HTTP_INTERNAL_SERVER_ERROR, request.method);
}
}
return CreateRangedMemoryDownloadResponse(handler, response);
}
MHD_RESULT CWebServer::CreateRangedMemoryDownloadResponse(
const std::shared_ptr<IHTTPRequestHandler>& handler, struct MHD_Response*& response) const
{
if (handler == nullptr)
return MHD_NO;
const HTTPRequest& request = handler->GetRequest();
const HTTPResponseDetails& responseDetails = handler->GetResponseDetails();
HttpResponseRanges responseRanges = handler->GetResponseData();
// if there's no or only one range this is not the right place
if (responseRanges.size() <= 1)
return CreateMemoryDownloadResponse(handler, response);
// extract all the valid ranges and calculate their total length
uint64_t firstRangePosition = 0;
HttpResponseRanges ranges;
for (const auto& range : responseRanges)
{
// ignore invalid ranges
if (!range.IsValid())
continue;
// determine the first range position
if (ranges.empty())
firstRangePosition = range.GetFirstPosition();
ranges.push_back(range);
}
if (ranges.empty())
return CreateMemoryDownloadResponse(request.connection, nullptr, 0, false, false, response);
// determine the last range position
uint64_t lastRangePosition = ranges.back().GetLastPosition();
// adjust the HTTP status of the response
handler->SetResponseStatus(MHD_HTTP_PARTIAL_CONTENT);
// add Content-Range header
handler->AddResponseHeader(
MHD_HTTP_HEADER_CONTENT_RANGE,
HttpRangeUtils::GenerateContentRangeHeaderValue(firstRangePosition, lastRangePosition,
responseDetails.totalLength));
// generate a multipart boundary
std::string multipartBoundary = HttpRangeUtils::GenerateMultipartBoundary();
// and the content-type
std::string contentType = HttpRangeUtils::GenerateMultipartBoundaryContentType(multipartBoundary);
// add Content-Type header
handler->AddResponseHeader(MHD_HTTP_HEADER_CONTENT_TYPE, contentType);
// generate the multipart boundary with the Content-Type header field
std::string multipartBoundaryWithHeader =
HttpRangeUtils::GenerateMultipartBoundaryWithHeader(multipartBoundary, contentType);
std::string result;
// add all the ranges to the result
for (HttpResponseRanges::const_iterator range = ranges.begin(); range != ranges.end(); ++range)
{
// add a newline before any new multipart boundary
if (range != ranges.begin())
result += HEADER_NEWLINE;
// generate and append the multipart boundary with the full header (Content-Type and
// Content-Length)
result +=
HttpRangeUtils::GenerateMultipartBoundaryWithHeader(multipartBoundaryWithHeader, &*range);
// and append the data of the range
result.append(static_cast<const char*>(range->GetData()),
static_cast<size_t>(range->GetLength()));
// check if we need to free the range data
if (responseDetails.type == HTTPMemoryDownloadFreeNoCopy ||
responseDetails.type == HTTPMemoryDownloadFreeCopy)
free(const_cast<void*>(range->GetData()));
}
result += HttpRangeUtils::GenerateMultipartBoundaryEnd(multipartBoundary);
// add Content-Length header
handler->AddResponseHeader(MHD_HTTP_HEADER_CONTENT_LENGTH,
std::to_string(static_cast<uint64_t>(result.size())));
// finally create the response
return CreateMemoryDownloadResponse(request.connection, result.c_str(), result.size(), false,
true, response);
}
MHD_RESULT CWebServer::CreateRedirect(struct MHD_Connection* connection,
const std::string& strURL,
struct MHD_Response*& response) const
{
response = create_response(0, nullptr, MHD_NO, MHD_NO);
if (response == nullptr)
{
m_logger->error("failed to create HTTP redirect response to {}", strURL);
return MHD_NO;
}
AddHeader(response, MHD_HTTP_HEADER_LOCATION, strURL);
return MHD_YES;
}
MHD_RESULT CWebServer::CreateFileDownloadResponse(
const std::shared_ptr<IHTTPRequestHandler>& handler, struct MHD_Response*& response) const
{
if (handler == nullptr)
return MHD_NO;
const HTTPRequest& request = handler->GetRequest();
const HTTPResponseDetails& responseDetails = handler->GetResponseDetails();
HttpResponseRanges responseRanges = handler->GetResponseData();
std::shared_ptr<XFILE::CFile> file = std::make_shared<XFILE::CFile>();
std::string filePath = handler->GetResponseFile();
// access check
if (!CFileUtils::CheckFileAccessAllowed(filePath))
return SendErrorResponse(request, MHD_HTTP_NOT_FOUND, request.method);
if (!file->Open(filePath, XFILE::READ_NO_CACHE))
{
m_logger->error("Failed to open {}", filePath);
return SendErrorResponse(request, MHD_HTTP_NOT_FOUND, request.method);
}
bool ranged = false;
uint64_t fileLength = static_cast<uint64_t>(file->GetLength());
// get the MIME type for the Content-Type header
std::string mimeType = responseDetails.contentType;
if (mimeType.empty())
{
std::string ext = URIUtils::GetExtension(filePath);
StringUtils::ToLower(ext);
mimeType = CreateMimeTypeFromExtension(ext.c_str());
}
uint64_t totalLength = 0;
std::unique_ptr<HttpFileDownloadContext> context = std::make_unique<HttpFileDownloadContext>();
context->file = file;
context->contentType = mimeType;
context->boundaryWritten = false;
context->writePosition = 0;
if (handler->IsRequestRanged())
{
if (!request.ranges.IsEmpty())
context->ranges = request.ranges;
else
HTTPRequestHandlerUtils::GetRequestedRanges(request.connection, fileLength, context->ranges);
}
uint64_t firstPosition = 0;
uint64_t lastPosition = 0;
// if there are no ranges, add the whole range
if (context->ranges.IsEmpty())
context->ranges.Add(CHttpRange(0, fileLength - 1));
else
{
handler->SetResponseStatus(MHD_HTTP_PARTIAL_CONTENT);
// we need to remember that we are ranged because the range length might change and won't be
// reliable anymore for length comparisons
ranged = true;
context->ranges.GetFirstPosition(firstPosition);
context->ranges.GetLastPosition(lastPosition);
}
// remember the total number of ranges
context->rangeCountTotal = context->ranges.Size();
// remember the total length
totalLength = context->ranges.GetLength();
// adjust the MIME type and range length in case of multiple ranges which requires multipart
// boundaries
if (context->rangeCountTotal > 1)
{
context->boundary = HttpRangeUtils::GenerateMultipartBoundary();
mimeType = HttpRangeUtils::GenerateMultipartBoundaryContentType(context->boundary);
// build part of the boundary with the optional Content-Type header
// "--<boundary>\r\nContent-Type: <content-type>\r\n
context->boundaryWithHeader = HttpRangeUtils::GenerateMultipartBoundaryWithHeader(
context->boundary, context->contentType);
context->boundaryEnd = HttpRangeUtils::GenerateMultipartBoundaryEnd(context->boundary);
// for every range, we need to add a boundary with header
for (HttpRanges::const_iterator range = context->ranges.Begin(); range != context->ranges.End();
++range)
{
// we need to temporarily add the Content-Range header to the boundary to be able to
// determine the length
std::string completeBoundaryWithHeader =
HttpRangeUtils::GenerateMultipartBoundaryWithHeader(context->boundaryWithHeader, &*range);
totalLength += completeBoundaryWithHeader.size();
// add a newline before any new multipart boundary
if (range != context->ranges.Begin())
totalLength += strlen(HEADER_NEWLINE);
}
// and at the very end a special end-boundary "\r\n--<boundary>--"
totalLength += context->boundaryEnd.size();
}
// set the initial write position
context->ranges.GetFirstPosition(context->writePosition);
// create the response object
response =
MHD_create_response_from_callback(totalLength, 2048, &CWebServer::ContentReaderCallback,
context.get(), &CWebServer::ContentReaderFreeCallback);
if (response == nullptr)
{
m_logger->error("failed to create a HTTP response for {} to be filled from{}", request.pathUrl,
filePath);
return MHD_NO;
}
context.release(); // ownership was passed to mhd
// add Content-Range header
if (ranged)
handler->AddResponseHeader(
MHD_HTTP_HEADER_CONTENT_RANGE,
HttpRangeUtils::GenerateContentRangeHeaderValue(firstPosition, lastPosition, fileLength));
// set the Content-Type header
if (!mimeType.empty())
handler->AddResponseHeader(MHD_HTTP_HEADER_CONTENT_TYPE, mimeType);
return MHD_YES;
}
MHD_RESULT CWebServer::CreateErrorResponse(struct MHD_Connection* connection,
int responseType,
HTTPMethod method,
struct MHD_Response*& response) const
{
size_t payloadSize = 0;
const void* payload = nullptr;
switch (responseType)
{
case MHD_HTTP_NOT_FOUND:
payloadSize = strlen(PAGE_FILE_NOT_FOUND);
payload = (const void*)PAGE_FILE_NOT_FOUND;
break;
case MHD_HTTP_NOT_IMPLEMENTED:
payloadSize = strlen(NOT_SUPPORTED);
payload = (const void*)NOT_SUPPORTED;
break;
}
response = create_response(payloadSize, payload, MHD_NO, MHD_NO);
if (response == nullptr)
{
m_logger->error("failed to create a HTTP {} error response", responseType);
return MHD_NO;
}
return MHD_YES;
}
MHD_RESULT CWebServer::CreateMemoryDownloadResponse(struct MHD_Connection* connection,
const void* data,
size_t size,
bool free,
bool copy,
struct MHD_Response*& response) const
{
response = create_response(size, const_cast<void*>(data), free ? MHD_YES : MHD_NO,
copy ? MHD_YES : MHD_NO);
if (response == nullptr)
{
m_logger->error("failed to create a HTTP download response");
return MHD_NO;
}
return MHD_YES;
}
MHD_RESULT CWebServer::SendResponse(const HTTPRequest& request,
int responseStatus,
MHD_Response* response) const
{
LogResponse(request, responseStatus);
MHD_RESULT ret = MHD_queue_response(request.connection, responseStatus, response);
MHD_destroy_response(response);
return ret;
}
MHD_RESULT CWebServer::SendErrorResponse(const HTTPRequest& request,
int errorType,
HTTPMethod method) const
{
struct MHD_Response* response = nullptr;
MHD_RESULT ret = CreateErrorResponse(request.connection, errorType, method, response);
if (ret == MHD_NO)
return MHD_NO;
return SendResponse(request, errorType, response);
}
void* CWebServer::UriRequestLogger(void* cls, const char* uri)
{
CWebServer* webServer = reinterpret_cast<CWebServer*>(cls);
// log the full URI
if (webServer == nullptr)
GetLogger()->debug("request received for {}", uri);
else
webServer->LogRequest(uri);
// create and return a new connection handler
return new ConnectionHandler(uri);
}
void CWebServer::LogRequest(const char* uri) const
{
if (uri == nullptr)
return;
m_logger->debug("request received for {}", uri);
}
ssize_t CWebServer::ContentReaderCallback(void* cls, uint64_t pos, char* buf, size_t max)
{
HttpFileDownloadContext* context = (HttpFileDownloadContext*)cls;
if (context == nullptr || context->file == nullptr)
return -1;
if (CServiceBroker::GetLogging().CanLogComponent(LOGWEBSERVER))
GetLogger()->debug("[OUT] write maximum {} bytes from {} ({})", max, context->writePosition,
pos);
// check if we need to add the end-boundary
if (context->rangeCountTotal > 1 && context->ranges.IsEmpty())
{
// put together the end-boundary
std::string endBoundary = HttpRangeUtils::GenerateMultipartBoundaryEnd(context->boundary);
if ((unsigned int)max != endBoundary.size())
return -1;
// copy the boundary into the buffer
memcpy(buf, endBoundary.c_str(), endBoundary.size());
return endBoundary.size();
}
CHttpRange range;
if (context->ranges.IsEmpty() || !context->ranges.GetFirst(range))
return -1;
uint64_t start = range.GetFirstPosition();
uint64_t end = range.GetLastPosition();
uint64_t maximum = (uint64_t)max;
int written = 0;
if (context->rangeCountTotal > 1 && !context->boundaryWritten)
{
// add a newline before any new multipart boundary
if (context->rangeCountTotal > context->ranges.Size())
{
size_t newlineLength = strlen(HEADER_NEWLINE);
memcpy(buf, HEADER_NEWLINE, newlineLength);
buf += newlineLength;
written += newlineLength;
maximum -= newlineLength;
}
// put together the boundary for the current range
std::string boundary =
HttpRangeUtils::GenerateMultipartBoundaryWithHeader(context->boundaryWithHeader, &range);
// copy the boundary into the buffer
memcpy(buf, boundary.c_str(), boundary.size());
// advance the buffer position
buf += boundary.size();
// update the number of written byte
written += boundary.size();
// update the maximum number of bytes
maximum -= boundary.size();
context->boundaryWritten = true;
}
// check if the current position is within this range
// if not, set it to the start position
if (context->writePosition < start || context->writePosition > end)
context->writePosition = start;
// adjust the maximum number of read bytes
maximum = std::min(maximum, end - context->writePosition + 1);
// seek to the position if necessary
if (context->file->GetPosition() < 0 ||
context->writePosition != static_cast<uint64_t>(context->file->GetPosition()))
context->file->Seek(context->writePosition);
// read data from the file
ssize_t res = context->file->Read(buf, static_cast<size_t>(maximum));
if (res <= 0)
return -1;
// add the number of read bytes to the number of written bytes
written += res;
if (CServiceBroker::GetLogging().CanLogComponent(LOGWEBSERVER))
GetLogger()->debug("[OUT] wrote {} bytes from {} in range ({} - {})", written,
context->writePosition, start, end);
// update the current write position
context->writePosition += res;
// if we have read all the data from the current range
// remove it from the list
if (context->writePosition >= end + 1)
{
context->ranges.Remove(0);
context->boundaryWritten = false;
}
return written;
}
void CWebServer::ContentReaderFreeCallback(void* cls)
{
HttpFileDownloadContext* context = (HttpFileDownloadContext*)cls;
delete context;
if (CServiceBroker::GetLogging().CanLogComponent(LOGWEBSERVER))
GetLogger()->debug("[OUT] done");
}
static Logger GetMhdLogger()
{
return CServiceBroker::GetLogging().GetLogger("libmicrohttpd");
}
// local helper
static void panicHandlerForMHD(void* unused,
const char* file,
unsigned int line,
const char* reason)
{
GetMhdLogger()->critical("serious error: reason \"{}\" in file \"{}\" at line {}",
reason ? reason : "", file ? file : "", line);
throw std::runtime_error("MHD serious error"); // FIXME: better solution?
}
// local helper
static void logFromMHD(void* unused, const char* fmt, va_list ap)
{
Logger logger = GetMhdLogger();
if (fmt == nullptr || fmt[0] == 0)
GetMhdLogger()->error("reported error with empty string");
else
{
std::string errDsc = StringUtils::FormatV(fmt, ap);
if (errDsc.empty())
GetMhdLogger()->error("reported error with unprintable string \"{}\"", fmt);
else
{
if (errDsc.at(errDsc.length() - 1) == '\n')
errDsc.erase(errDsc.length() - 1);
// Most common error is "aborted connection", so log it at LOGDEBUG level
GetMhdLogger()->debug(errDsc);
}
}
}
bool CWebServer::LoadCert(std::string& skey, std::string& scert)
{
XFILE::CFile file;
std::vector<uint8_t> buf;
const char* keyFile = "special://userdata/server.key";
const char* certFile = "special://userdata/server.pem";
if (!file.Exists(keyFile) || !file.Exists(certFile))
return false;
if (file.LoadFile(keyFile, buf) > 0)
{
skey.resize(buf.size());
skey.assign(reinterpret_cast<char*>(buf.data()));
file.Close();
}
else
m_logger->error("{}: Error loading: {}", __FUNCTION__, keyFile);
if (file.LoadFile(certFile, buf) > 0)
{
scert.resize(buf.size());
scert.assign(reinterpret_cast<char*>(buf.data()));
file.Close();
}
else
m_logger->error("{}: Error loading: {}", __FUNCTION__, certFile);
if (!skey.empty() && !scert.empty())
{
m_logger->info("{}: found server key: {}, certificate: {}, HTTPS support enabled", __FUNCTION__,
keyFile, certFile);
return true;
}
return false;
}
struct MHD_Daemon* CWebServer::StartMHD(unsigned int flags, int port)
{
unsigned int timeout = 60 * 60 * 24;
const char* ciphers = "NORMAL:-VERS-TLS1.0";
MHD_set_panic_func(&panicHandlerForMHD, nullptr);
if (CServiceBroker::GetSettingsComponent()->GetSettings()->GetBool(
CSettings::SETTING_SERVICES_WEBSERVERSSL) &&
MHD_is_feature_supported(MHD_FEATURE_SSL) == MHD_YES && LoadCert(m_key, m_cert))
// SSL enabled
return MHD_start_daemon(
flags |
// one thread per connection
// WARNING: set MHD_OPTION_CONNECTION_TIMEOUT to something higher than 1
// otherwise on libmicrohttpd 0.4.4-1 it spins a busy loop
MHD_USE_THREAD_PER_CONNECTION
#if (MHD_VERSION >= 0x00095207)
|
MHD_USE_INTERNAL_POLLING_THREAD /* MHD_USE_THREAD_PER_CONNECTION must be used only with
MHD_USE_INTERNAL_POLLING_THREAD since 0.9.54 */
#endif
| MHD_USE_DEBUG /* Print MHD error messages to log */
| MHD_USE_SSL,
port, 0, 0, &CWebServer::AnswerToConnection, this,
MHD_OPTION_EXTERNAL_LOGGER, &logFromMHD, 0, MHD_OPTION_CONNECTION_LIMIT, 512,
MHD_OPTION_CONNECTION_TIMEOUT, timeout, MHD_OPTION_URI_LOG_CALLBACK,
&CWebServer::UriRequestLogger, this, MHD_OPTION_THREAD_STACK_SIZE, m_thread_stacksize,
MHD_OPTION_HTTPS_MEM_KEY, m_key.c_str(), MHD_OPTION_HTTPS_MEM_CERT, m_cert.c_str(),
MHD_OPTION_HTTPS_PRIORITIES, ciphers, MHD_OPTION_END);
// No SSL
return MHD_start_daemon(
flags |
// one thread per connection
// WARNING: set MHD_OPTION_CONNECTION_TIMEOUT to something higher than 1
// otherwise on libmicrohttpd 0.4.4-1 it spins a busy loop
MHD_USE_THREAD_PER_CONNECTION
#if (MHD_VERSION >= 0x00095207)
| MHD_USE_INTERNAL_POLLING_THREAD /* MHD_USE_THREAD_PER_CONNECTION must be used only with
MHD_USE_INTERNAL_POLLING_THREAD since 0.9.54 */
#endif
| MHD_USE_DEBUG /* Print MHD error messages to log */
,
port, 0, 0, &CWebServer::AnswerToConnection, this,
MHD_OPTION_EXTERNAL_LOGGER, &logFromMHD, 0, MHD_OPTION_CONNECTION_LIMIT, 512,
MHD_OPTION_CONNECTION_TIMEOUT, timeout, MHD_OPTION_URI_LOG_CALLBACK,
&CWebServer::UriRequestLogger, this, MHD_OPTION_THREAD_STACK_SIZE, m_thread_stacksize,
MHD_OPTION_END);
}
bool CWebServer::Start(uint16_t port, const std::string& username, const std::string& password)
{
SetCredentials(username, password);
if (!m_running)
{
// use a new logger containing the port in the name
m_logger = CServiceBroker::GetLogging().GetLogger(StringUtils::Format("CWebserver[{}]", port));
int v6testSock;
if ((v6testSock = socket(AF_INET6, SOCK_STREAM, 0)) >= 0)
{
closesocket(v6testSock);
m_daemon_ip6 = StartMHD(MHD_USE_IPv6, port);
}
m_daemon_ip4 = StartMHD(0, port);
m_running = (m_daemon_ip6 != nullptr) || (m_daemon_ip4 != nullptr);
if (m_running)
{
m_port = port;
m_logger->info("Started");
}
else
m_logger->error("Failed to start");
}
return m_running;
}
bool CWebServer::Stop()
{
if (!m_running)
return true;
if (m_daemon_ip6 != nullptr)
MHD_stop_daemon(m_daemon_ip6);
if (m_daemon_ip4 != nullptr)
MHD_stop_daemon(m_daemon_ip4);
m_running = false;
m_logger->info("Stopped");
m_port = 0;
return true;
}
bool CWebServer::IsStarted()
{
return m_running;
}
bool CWebServer::WebServerSupportsSSL()
{
return MHD_is_feature_supported(MHD_FEATURE_SSL) == MHD_YES;
}
void CWebServer::SetCredentials(const std::string& username, const std::string& password)
{
std::unique_lock<CCriticalSection> lock(m_critSection);
m_authenticationUsername = username;
m_authenticationPassword = password;
m_authenticationRequired = !m_authenticationPassword.empty();
}
void CWebServer::RegisterRequestHandler(IHTTPRequestHandler* handler)
{
if (handler == nullptr)
return;
const auto& it = std::find(m_requestHandlers.cbegin(), m_requestHandlers.cend(), handler);
if (it != m_requestHandlers.cend())
return;
m_requestHandlers.push_back(handler);
std::sort(m_requestHandlers.begin(), m_requestHandlers.end(),
[](IHTTPRequestHandler* lhs, IHTTPRequestHandler* rhs) {
return rhs->GetPriority() < lhs->GetPriority();
});
}
void CWebServer::UnregisterRequestHandler(IHTTPRequestHandler* handler)
{
if (handler == nullptr)
return;
m_requestHandlers.erase(std::remove(m_requestHandlers.begin(), m_requestHandlers.end(), handler),
m_requestHandlers.end());
}
void CWebServer::LogRequest(const HTTPRequest& request) const
{
if (!CServiceBroker::GetLogging().CanLogComponent(LOGWEBSERVER))
return;
std::multimap<std::string, std::string> headerValues;
HTTPRequestHandlerUtils::GetRequestHeaderValues(request.connection, MHD_HEADER_KIND,
headerValues);
std::multimap<std::string, std::string> getValues;
HTTPRequestHandlerUtils::GetRequestHeaderValues(request.connection, MHD_GET_ARGUMENT_KIND,
getValues);
m_logger->debug(" [IN] {} {} {}", request.version, GetHTTPMethod(request.method),
request.pathUrlFull);
if (!getValues.empty())
{
std::vector<std::string> values;
for (const auto& get : getValues)
values.push_back(get.first + " = " + get.second);
m_logger->debug(" [IN] Query arguments: {}", StringUtils::Join(values, "; "));
}
for (const auto& header : headerValues)
m_logger->debug(" [IN] {}: {}", header.first, header.second);
}
void CWebServer::LogResponse(const HTTPRequest& request, int responseStatus) const
{
if (!CServiceBroker::GetLogging().CanLogComponent(LOGWEBSERVER))
return;
std::multimap<std::string, std::string> headerValues;
HTTPRequestHandlerUtils::GetRequestHeaderValues(request.connection, MHD_HEADER_KIND,
headerValues);
m_logger->debug("[OUT] {} {} {}", request.version, responseStatus, request.pathUrlFull);
for (const auto& header : headerValues)
m_logger->debug("[OUT] {}: {}", header.first, header.second);
}
std::string CWebServer::CreateMimeTypeFromExtension(const char* ext)
{
if (strcmp(ext, ".kar") == 0)
return "audio/midi";
if (strcmp(ext, ".tbn") == 0)
return "image/jpeg";
return CMime::GetMimeType(ext);
}
MHD_RESULT CWebServer::AddHeader(struct MHD_Response* response,
const std::string& name,
const std::string& value) const
{
if (response == nullptr || name.empty())
return MHD_NO;
if (CServiceBroker::GetLogging().CanLogComponent(LOGWEBSERVER))
m_logger->debug("[OUT] {}: {}", name, value);
if (name == MHD_HTTP_HEADER_CONTENT_LENGTH)
m_logger->warn("Attempt to override MHD automatic \"Content-Length\" header");
return MHD_add_response_header(response, name.c_str(), value.c_str());
}
Logger CWebServer::GetLogger()
{
static Logger s_logger = CServiceBroker::GetLogging().GetLogger("CWebServer");
return s_logger;
}
|
