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bitcoin/src/httpserver.cpp

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// Copyright (c) 2015-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#if defined(HAVE_CONFIG_H)
#include <config/bitcoin-config.h>
#endif
#include <httpserver.h>
#include <chainparamsbase.h>
#include <common/args.h>
#include <compat/compat.h>
#include <logging.h>
#include <netbase.h>
#include <node/interface_ui.h>
#include <rpc/protocol.h> // For HTTP status codes
#include <sync.h>
#include <util/check.h>
#include <util/signalinterrupt.h>
#include <util/strencodings.h>
#include <util/threadnames.h>
#include <util/translation.h>
#include <condition_variable>
#include <cstdio>
#include <cstdlib>
#include <deque>
#include <memory>
#include <optional>
#include <string>
#include <unordered_map>
#include <sys/types.h>
#include <sys/stat.h>
#include <event2/buffer.h>
#include <event2/bufferevent.h>
#include <event2/http.h>
#include <event2/http_struct.h>
#include <event2/keyvalq_struct.h>
#include <event2/thread.h>
#include <event2/util.h>
#include <support/events.h>
/** Maximum size of http request (request line + headers) */
static const size_t MAX_HEADERS_SIZE = 8192;
/** HTTP request work item */
class HTTPWorkItem final : public HTTPClosure
{
public:
HTTPWorkItem(std::unique_ptr<HTTPRequest> _req, const std::string &_path, const HTTPRequestHandler& _func):
req(std::move(_req)), path(_path), func(_func)
{
}
void operator()() override
{
func(req.get(), path);
}
std::unique_ptr<HTTPRequest> req;
private:
std::string path;
HTTPRequestHandler func;
};
/** Simple work queue for distributing work over multiple threads.
* Work items are simply callable objects.
*/
template <typename WorkItem>
class WorkQueue
{
private:
Mutex cs;
std::condition_variable cond GUARDED_BY(cs);
std::deque<std::unique_ptr<WorkItem>> queue GUARDED_BY(cs);
bool running GUARDED_BY(cs){true};
const size_t maxDepth;
public:
explicit WorkQueue(size_t _maxDepth) : maxDepth(_maxDepth)
{
}
/** Precondition: worker threads have all stopped (they have been joined).
*/
~WorkQueue() = default;
/** Enqueue a work item */
bool Enqueue(WorkItem* item) EXCLUSIVE_LOCKS_REQUIRED(!cs)
{
LOCK(cs);
if (!running || queue.size() >= maxDepth) {
return false;
}
queue.emplace_back(std::unique_ptr<WorkItem>(item));
cond.notify_one();
return true;
}
/** Thread function */
void Run() EXCLUSIVE_LOCKS_REQUIRED(!cs)
{
while (true) {
std::unique_ptr<WorkItem> i;
{
WAIT_LOCK(cs, lock);
while (running && queue.empty())
cond.wait(lock);
if (!running && queue.empty())
break;
i = std::move(queue.front());
queue.pop_front();
}
(*i)();
}
}
/** Interrupt and exit loops */
void Interrupt() EXCLUSIVE_LOCKS_REQUIRED(!cs)
{
LOCK(cs);
running = false;
cond.notify_all();
}
};
struct HTTPPathHandler
{
HTTPPathHandler(std::string _prefix, bool _exactMatch, HTTPRequestHandler _handler):
prefix(_prefix), exactMatch(_exactMatch), handler(_handler)
{
}
std::string prefix;
bool exactMatch;
HTTPRequestHandler handler;
};
/** HTTP module state */
//! libevent event loop
static struct event_base* eventBase = nullptr;
//! HTTP server
static struct evhttp* eventHTTP = nullptr;
//! List of subnets to allow RPC connections from
static std::vector<CSubNet> rpc_allow_subnets;
//! Work queue for handling longer requests off the event loop thread
static std::unique_ptr<WorkQueue<HTTPClosure>> g_work_queue{nullptr};
//! Handlers for (sub)paths
static GlobalMutex g_httppathhandlers_mutex;
static std::vector<HTTPPathHandler> pathHandlers GUARDED_BY(g_httppathhandlers_mutex);
//! Bound listening sockets
static std::vector<evhttp_bound_socket *> boundSockets;
/**
* @brief Helps keep track of open `evhttp_connection`s with active `evhttp_requests`
*
*/
class HTTPRequestTracker
{
private:
mutable Mutex m_mutex;
mutable std::condition_variable m_cv;
//! For each connection, keep a counter of how many requests are open
std::unordered_map<const evhttp_connection*, size_t> m_tracker GUARDED_BY(m_mutex);
void RemoveConnectionInternal(const decltype(m_tracker)::iterator it) EXCLUSIVE_LOCKS_REQUIRED(m_mutex)
{
m_tracker.erase(it);
if (m_tracker.empty()) m_cv.notify_all();
}
public:
//! Increase request counter for the associated connection by 1
void AddRequest(evhttp_request* req) EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
{
const evhttp_connection* conn{Assert(evhttp_request_get_connection(Assert(req)))};
WITH_LOCK(m_mutex, ++m_tracker[conn]);
}
//! Decrease request counter for the associated connection by 1, remove connection if counter is 0
void RemoveRequest(evhttp_request* req) EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
{
const evhttp_connection* conn{Assert(evhttp_request_get_connection(Assert(req)))};
LOCK(m_mutex);
auto it{m_tracker.find(conn)};
if (it != m_tracker.end() && it->second > 0) {
if (--(it->second) == 0) RemoveConnectionInternal(it);
}
}
//! Remove a connection entirely
void RemoveConnection(const evhttp_connection* conn) EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
{
LOCK(m_mutex);
auto it{m_tracker.find(Assert(conn))};
if (it != m_tracker.end()) RemoveConnectionInternal(it);
}
size_t CountActiveConnections() const EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
{
return WITH_LOCK(m_mutex, return m_tracker.size());
}
//! Wait until there are no more connections with active requests in the tracker
void WaitUntilEmpty() const EXCLUSIVE_LOCKS_REQUIRED(!m_mutex)
{
WAIT_LOCK(m_mutex, lock);
m_cv.wait(lock, [this]() EXCLUSIVE_LOCKS_REQUIRED(m_mutex) { return m_tracker.empty(); });
}
};
//! Track active requests
static HTTPRequestTracker g_requests;
/** Check if a network address is allowed to access the HTTP server */
static bool ClientAllowed(const CNetAddr& netaddr)
{
if (!netaddr.IsValid())
return false;
for(const CSubNet& subnet : rpc_allow_subnets)
if (subnet.Match(netaddr))
return true;
return false;
}
/** Initialize ACL list for HTTP server */
static bool InitHTTPAllowList()
{
rpc_allow_subnets.clear();
rpc_allow_subnets.emplace_back(LookupHost("127.0.0.1", false).value(), 8); // always allow IPv4 local subnet
rpc_allow_subnets.emplace_back(LookupHost("::1", false).value()); // always allow IPv6 localhost
for (const std::string& strAllow : gArgs.GetArgs("-rpcallowip")) {
const CSubNet subnet{LookupSubNet(strAllow)};
if (!subnet.IsValid()) {
uiInterface.ThreadSafeMessageBox(
strprintf(Untranslated("Invalid -rpcallowip subnet specification: %s. Valid are a single IP (e.g. 1.2.3.4), a network/netmask (e.g. 1.2.3.4/255.255.255.0) or a network/CIDR (e.g. 1.2.3.4/24)."), strAllow),
"", CClientUIInterface::MSG_ERROR);
return false;
}
rpc_allow_subnets.push_back(subnet);
}
std::string strAllowed;
for (const CSubNet& subnet : rpc_allow_subnets)
strAllowed += subnet.ToString() + " ";
LogPrint(BCLog::HTTP, "Allowing HTTP connections from: %s\n", strAllowed);
return true;
}
/** HTTP request method as string - use for logging only */
std::string RequestMethodString(HTTPRequest::RequestMethod m)
{
switch (m) {
case HTTPRequest::GET:
return "GET";
case HTTPRequest::POST:
return "POST";
case HTTPRequest::HEAD:
return "HEAD";
case HTTPRequest::PUT:
return "PUT";
case HTTPRequest::UNKNOWN:
return "unknown";
} // no default case, so the compiler can warn about missing cases
assert(false);
}
/** HTTP request callback */
static void http_request_cb(struct evhttp_request* req, void* arg)
{
evhttp_connection* conn{evhttp_request_get_connection(req)};
// Track active requests
{
g_requests.AddRequest(req);
evhttp_request_set_on_complete_cb(req, [](struct evhttp_request* req, void*) {
g_requests.RemoveRequest(req);
}, nullptr);
evhttp_connection_set_closecb(conn, [](evhttp_connection* conn, void* arg) {
g_requests.RemoveConnection(conn);
}, nullptr);
}
// Disable reading to work around a libevent bug, fixed in 2.1.9
// See https://github.com/libevent/libevent/commit/5ff8eb26371c4dc56f384b2de35bea2d87814779
// and https://github.com/bitcoin/bitcoin/pull/11593.
if (event_get_version_number() >= 0x02010600 && event_get_version_number() < 0x02010900) {
if (conn) {
bufferevent* bev = evhttp_connection_get_bufferevent(conn);
if (bev) {
bufferevent_disable(bev, EV_READ);
}
}
}
auto hreq{std::make_unique<HTTPRequest>(req, *static_cast<const util::SignalInterrupt*>(arg))};
// Early address-based allow check
if (!ClientAllowed(hreq->GetPeer())) {
LogPrint(BCLog::HTTP, "HTTP request from %s rejected: Client network is not allowed RPC access\n",
hreq->GetPeer().ToStringAddrPort());
hreq->WriteReply(HTTP_FORBIDDEN);
return;
}
// Early reject unknown HTTP methods
if (hreq->GetRequestMethod() == HTTPRequest::UNKNOWN) {
LogPrint(BCLog::HTTP, "HTTP request from %s rejected: Unknown HTTP request method\n",
hreq->GetPeer().ToStringAddrPort());
hreq->WriteReply(HTTP_BAD_METHOD);
return;
}
LogPrint(BCLog::HTTP, "Received a %s request for %s from %s\n",
RequestMethodString(hreq->GetRequestMethod()), SanitizeString(hreq->GetURI(), SAFE_CHARS_URI).substr(0, 100), hreq->GetPeer().ToStringAddrPort());
// Find registered handler for prefix
std::string strURI = hreq->GetURI();
std::string path;
LOCK(g_httppathhandlers_mutex);
std::vector<HTTPPathHandler>::const_iterator i = pathHandlers.begin();
std::vector<HTTPPathHandler>::const_iterator iend = pathHandlers.end();
for (; i != iend; ++i) {
bool match = false;
if (i->exactMatch)
match = (strURI == i->prefix);
else
match = (strURI.substr(0, i->prefix.size()) == i->prefix);
if (match) {
path = strURI.substr(i->prefix.size());
break;
}
}
// Dispatch to worker thread
if (i != iend) {
std::unique_ptr<HTTPWorkItem> item(new HTTPWorkItem(std::move(hreq), path, i->handler));
assert(g_work_queue);
if (g_work_queue->Enqueue(item.get())) {
item.release(); /* if true, queue took ownership */
} else {
LogPrintf("WARNING: request rejected because http work queue depth exceeded, it can be increased with the -rpcworkqueue= setting\n");
item->req->WriteReply(HTTP_SERVICE_UNAVAILABLE, "Work queue depth exceeded");
}
} else {
hreq->WriteReply(HTTP_NOT_FOUND);
}
}
/** Callback to reject HTTP requests after shutdown. */
static void http_reject_request_cb(struct evhttp_request* req, void*)
{
LogPrint(BCLog::HTTP, "Rejecting request while shutting down\n");
evhttp_send_error(req, HTTP_SERVUNAVAIL, nullptr);
}
/** Event dispatcher thread */
static void ThreadHTTP(struct event_base* base)
{
util::ThreadRename("http");
LogPrint(BCLog::HTTP, "Entering http event loop\n");
event_base_dispatch(base);
// Event loop will be interrupted by InterruptHTTPServer()
LogPrint(BCLog::HTTP, "Exited http event loop\n");
}
/** Bind HTTP server to specified addresses */
static bool HTTPBindAddresses(struct evhttp* http)
{
uint16_t http_port{static_cast<uint16_t>(gArgs.GetIntArg("-rpcport", BaseParams().RPCPort()))};
std::vector<std::pair<std::string, uint16_t>> endpoints;
// Determine what addresses to bind to
if (!(gArgs.IsArgSet("-rpcallowip") && gArgs.IsArgSet("-rpcbind"))) { // Default to loopback if not allowing external IPs
endpoints.emplace_back("::1", http_port);
endpoints.emplace_back("127.0.0.1", http_port);
if (gArgs.IsArgSet("-rpcallowip")) {
LogPrintf("WARNING: option -rpcallowip was specified without -rpcbind; this doesn't usually make sense\n");
}
if (gArgs.IsArgSet("-rpcbind")) {
LogPrintf("WARNING: option -rpcbind was ignored because -rpcallowip was not specified, refusing to allow everyone to connect\n");
}
} else if (gArgs.IsArgSet("-rpcbind")) { // Specific bind address
for (const std::string& strRPCBind : gArgs.GetArgs("-rpcbind")) {
uint16_t port{http_port};
std::string host;
SplitHostPort(strRPCBind, port, host);
endpoints.emplace_back(host, port);
}
}
// Bind addresses
for (std::vector<std::pair<std::string, uint16_t> >::iterator i = endpoints.begin(); i != endpoints.end(); ++i) {
LogPrintf("Binding RPC on address %s port %i\n", i->first, i->second);
evhttp_bound_socket *bind_handle = evhttp_bind_socket_with_handle(http, i->first.empty() ? nullptr : i->first.c_str(), i->second);
if (bind_handle) {
const std::optional<CNetAddr> addr{LookupHost(i->first, false)};
if (i->first.empty() || (addr.has_value() && addr->IsBindAny())) {
LogPrintf("WARNING: the RPC server is not safe to expose to untrusted networks such as the public internet\n");
}
boundSockets.push_back(bind_handle);
} else {
LogPrintf("Binding RPC on address %s port %i failed.\n", i->first, i->second);
}
}
return !boundSockets.empty();
}
/** Simple wrapper to set thread name and run work queue */
static void HTTPWorkQueueRun(WorkQueue<HTTPClosure>* queue, int worker_num)
{
util::ThreadRename(strprintf("httpworker.%i", worker_num));
queue->Run();
}
/** libevent event log callback */
static void libevent_log_cb(int severity, const char *msg)
{
BCLog::Level level;
switch (severity) {
case EVENT_LOG_DEBUG:
level = BCLog::Level::Debug;
break;
case EVENT_LOG_MSG:
level = BCLog::Level::Info;
break;
case EVENT_LOG_WARN:
level = BCLog::Level::Warning;
break;
default: // EVENT_LOG_ERR and others are mapped to error
level = BCLog::Level::Error;
break;
}
LogPrintLevel(BCLog::LIBEVENT, level, "%s\n", msg);
}
bool InitHTTPServer(const util::SignalInterrupt& interrupt)
{
if (!InitHTTPAllowList())
return false;
// Redirect libevent's logging to our own log
event_set_log_callback(&libevent_log_cb);
// Update libevent's log handling.
UpdateHTTPServerLogging(LogInstance().WillLogCategory(BCLog::LIBEVENT));
#ifdef WIN32
evthread_use_windows_threads();
#else
evthread_use_pthreads();
#endif
raii_event_base base_ctr = obtain_event_base();
/* Create a new evhttp object to handle requests. */
raii_evhttp http_ctr = obtain_evhttp(base_ctr.get());
struct evhttp* http = http_ctr.get();
if (!http) {
LogPrintf("couldn't create evhttp. Exiting.\n");
return false;
}
evhttp_set_timeout(http, gArgs.GetIntArg("-rpcservertimeout", DEFAULT_HTTP_SERVER_TIMEOUT));
evhttp_set_max_headers_size(http, MAX_HEADERS_SIZE);
evhttp_set_max_body_size(http, MAX_SIZE);
evhttp_set_gencb(http, http_request_cb, (void*)&interrupt);
if (!HTTPBindAddresses(http)) {
LogPrintf("Unable to bind any endpoint for RPC server\n");
return false;
}
LogPrint(BCLog::HTTP, "Initialized HTTP server\n");
int workQueueDepth = std::max((long)gArgs.GetIntArg("-rpcworkqueue", DEFAULT_HTTP_WORKQUEUE), 1L);
LogDebug(BCLog::HTTP, "creating work queue of depth %d\n", workQueueDepth);
g_work_queue = std::make_unique<WorkQueue<HTTPClosure>>(workQueueDepth);
// transfer ownership to eventBase/HTTP via .release()
eventBase = base_ctr.release();
eventHTTP = http_ctr.release();
return true;
}
void UpdateHTTPServerLogging(bool enable) {
if (enable) {
event_enable_debug_logging(EVENT_DBG_ALL);
} else {
event_enable_debug_logging(EVENT_DBG_NONE);
}
}
static std::thread g_thread_http;
static std::vector<std::thread> g_thread_http_workers;
void StartHTTPServer()
{
int rpcThreads = std::max((long)gArgs.GetIntArg("-rpcthreads", DEFAULT_HTTP_THREADS), 1L);
LogInfo("Starting HTTP server with %d worker threads\n", rpcThreads);
g_thread_http = std::thread(ThreadHTTP, eventBase);
for (int i = 0; i < rpcThreads; i++) {
g_thread_http_workers.emplace_back(HTTPWorkQueueRun, g_work_queue.get(), i);
}
}
void InterruptHTTPServer()
{
LogPrint(BCLog::HTTP, "Interrupting HTTP server\n");
if (eventHTTP) {
// Reject requests on current connections
evhttp_set_gencb(eventHTTP, http_reject_request_cb, nullptr);
}
if (g_work_queue) {
g_work_queue->Interrupt();
}
}
void StopHTTPServer()
{
LogPrint(BCLog::HTTP, "Stopping HTTP server\n");
if (g_work_queue) {
LogPrint(BCLog::HTTP, "Waiting for HTTP worker threads to exit\n");
for (auto& thread : g_thread_http_workers) {
thread.join();
}
g_thread_http_workers.clear();
}
// Unlisten sockets, these are what make the event loop running, which means
// that after this and all connections are closed the event loop will quit.
for (evhttp_bound_socket *socket : boundSockets) {
evhttp_del_accept_socket(eventHTTP, socket);
}
boundSockets.clear();
{
if (const auto n_connections{g_requests.CountActiveConnections()}; n_connections != 0) {
LogPrint(BCLog::HTTP, "Waiting for %d connections to stop HTTP server\n", n_connections);
}
g_requests.WaitUntilEmpty();
}
if (eventHTTP) {
// Schedule a callback to call evhttp_free in the event base thread, so
// that evhttp_free does not need to be called again after the handling
// of unfinished request connections that follows.
event_base_once(eventBase, -1, EV_TIMEOUT, [](evutil_socket_t, short, void*) {
evhttp_free(eventHTTP);
eventHTTP = nullptr;
}, nullptr, nullptr);
}
if (eventBase) {
LogPrint(BCLog::HTTP, "Waiting for HTTP event thread to exit\n");
if (g_thread_http.joinable()) g_thread_http.join();
event_base_free(eventBase);
eventBase = nullptr;
}
g_work_queue.reset();
LogPrint(BCLog::HTTP, "Stopped HTTP server\n");
}
struct event_base* EventBase()
{
return eventBase;
}
static void httpevent_callback_fn(evutil_socket_t, short, void* data)
{
// Static handler: simply call inner handler
HTTPEvent *self = static_cast<HTTPEvent*>(data);
self->handler();
if (self->deleteWhenTriggered)
delete self;
}
HTTPEvent::HTTPEvent(struct event_base* base, bool _deleteWhenTriggered, const std::function<void()>& _handler):
deleteWhenTriggered(_deleteWhenTriggered), handler(_handler)
{
ev = event_new(base, -1, 0, httpevent_callback_fn, this);
assert(ev);
}
HTTPEvent::~HTTPEvent()
{
event_free(ev);
}
void HTTPEvent::trigger(struct timeval* tv)
{
if (tv == nullptr)
event_active(ev, 0, 0); // immediately trigger event in main thread
else
evtimer_add(ev, tv); // trigger after timeval passed
}
HTTPRequest::HTTPRequest(struct evhttp_request* _req, const util::SignalInterrupt& interrupt, bool _replySent)
: req(_req), m_interrupt(interrupt), replySent(_replySent)
{
}
HTTPRequest::~HTTPRequest()
{
if (!replySent) {
// Keep track of whether reply was sent to avoid request leaks
LogPrintf("%s: Unhandled request\n", __func__);
WriteReply(HTTP_INTERNAL_SERVER_ERROR, "Unhandled request");
}
// evhttpd cleans up the request, as long as a reply was sent.
}
std::pair<bool, std::string> HTTPRequest::GetHeader(const std::string& hdr) const
{
const struct evkeyvalq* headers = evhttp_request_get_input_headers(req);
assert(headers);
const char* val = evhttp_find_header(headers, hdr.c_str());
if (val)
return std::make_pair(true, val);
else
return std::make_pair(false, "");
}
std::string HTTPRequest::ReadBody()
{
struct evbuffer* buf = evhttp_request_get_input_buffer(req);
if (!buf)
return "";
size_t size = evbuffer_get_length(buf);
/** Trivial implementation: if this is ever a performance bottleneck,
* internal copying can be avoided in multi-segment buffers by using
* evbuffer_peek and an awkward loop. Though in that case, it'd be even
* better to not copy into an intermediate string but use a stream
* abstraction to consume the evbuffer on the fly in the parsing algorithm.
*/
const char* data = (const char*)evbuffer_pullup(buf, size);
if (!data) // returns nullptr in case of empty buffer
return "";
std::string rv(data, size);
evbuffer_drain(buf, size);
return rv;
}
void HTTPRequest::WriteHeader(const std::string& hdr, const std::string& value)
{
struct evkeyvalq* headers = evhttp_request_get_output_headers(req);
assert(headers);
evhttp_add_header(headers, hdr.c_str(), value.c_str());
}
/** Closure sent to main thread to request a reply to be sent to
* a HTTP request.
* Replies must be sent in the main loop in the main http thread,
* this cannot be done from worker threads.
*/
void HTTPRequest::WriteReply(int nStatus, const std::string& strReply)
{
assert(!replySent && req);
if (m_interrupt) {
WriteHeader("Connection", "close");
}
// Send event to main http thread to send reply message
struct evbuffer* evb = evhttp_request_get_output_buffer(req);
assert(evb);
evbuffer_add(evb, strReply.data(), strReply.size());
auto req_copy = req;
HTTPEvent* ev = new HTTPEvent(eventBase, true, [req_copy, nStatus]{
evhttp_send_reply(req_copy, nStatus, nullptr, nullptr);
// Re-enable reading from the socket. This is the second part of the libevent
// workaround above.
if (event_get_version_number() >= 0x02010600 && event_get_version_number() < 0x02010900) {
evhttp_connection* conn = evhttp_request_get_connection(req_copy);
if (conn) {
bufferevent* bev = evhttp_connection_get_bufferevent(conn);
if (bev) {
bufferevent_enable(bev, EV_READ | EV_WRITE);
}
}
}
});
ev->trigger(nullptr);
replySent = true;
req = nullptr; // transferred back to main thread
}
CService HTTPRequest::GetPeer() const
{
evhttp_connection* con = evhttp_request_get_connection(req);
CService peer;
if (con) {
// evhttp retains ownership over returned address string
const char* address = "";
uint16_t port = 0;
#ifdef HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR
evhttp_connection_get_peer(con, &address, &port);
#else
evhttp_connection_get_peer(con, (char**)&address, &port);
#endif // HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR
peer = MaybeFlipIPv6toCJDNS(LookupNumeric(address, port));
}
return peer;
}
std::string HTTPRequest::GetURI() const
{
return evhttp_request_get_uri(req);
}
HTTPRequest::RequestMethod HTTPRequest::GetRequestMethod() const
{
switch (evhttp_request_get_command(req)) {
case EVHTTP_REQ_GET:
return GET;
case EVHTTP_REQ_POST:
return POST;
case EVHTTP_REQ_HEAD:
return HEAD;
case EVHTTP_REQ_PUT:
return PUT;
default:
return UNKNOWN;
}
}
std::optional<std::string> HTTPRequest::GetQueryParameter(const std::string& key) const
{
const char* uri{evhttp_request_get_uri(req)};
return GetQueryParameterFromUri(uri, key);
}
std::optional<std::string> GetQueryParameterFromUri(const char* uri, const std::string& key)
{
evhttp_uri* uri_parsed{evhttp_uri_parse(uri)};
if (!uri_parsed) {
throw std::runtime_error("URI parsing failed, it likely contained RFC 3986 invalid characters");
}
const char* query{evhttp_uri_get_query(uri_parsed)};
std::optional<std::string> result;
if (query) {
// Parse the query string into a key-value queue and iterate over it
struct evkeyvalq params_q;
evhttp_parse_query_str(query, &params_q);
for (struct evkeyval* param{params_q.tqh_first}; param != nullptr; param = param->next.tqe_next) {
if (param->key == key) {
result = param->value;
break;
}
}
evhttp_clear_headers(&params_q);
}
evhttp_uri_free(uri_parsed);
return result;
}
void RegisterHTTPHandler(const std::string &prefix, bool exactMatch, const HTTPRequestHandler &handler)
{
LogPrint(BCLog::HTTP, "Registering HTTP handler for %s (exactmatch %d)\n", prefix, exactMatch);
LOCK(g_httppathhandlers_mutex);
pathHandlers.emplace_back(prefix, exactMatch, handler);
}
void UnregisterHTTPHandler(const std::string &prefix, bool exactMatch)
{
LOCK(g_httppathhandlers_mutex);
std::vector<HTTPPathHandler>::iterator i = pathHandlers.begin();
std::vector<HTTPPathHandler>::iterator iend = pathHandlers.end();
for (; i != iend; ++i)
if (i->prefix == prefix && i->exactMatch == exactMatch)
break;
if (i != iend)
{
LogPrint(BCLog::HTTP, "Unregistering HTTP handler for %s (exactmatch %d)\n", prefix, exactMatch);
pathHandlers.erase(i);
}
}
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