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/*
*
* (C) 2010-2025 Anope Team
* Contact us at team@anope.org
*
* Please read COPYING and README for further details.
*/
#include "module.h"
#include "modules/rpc.h"
#include "modules/httpd.h"
#include "yyjson/yyjson.c"
inline Anope::string yyjson_get_astr(yyjson_val *val, const char *key)
{
const auto *str = yyjson_get_str(yyjson_obj_get(val, key));
return str ? str : "";
}
class MyJSONRPCServiceInterface final
: public RPCServiceInterface
, public HTTPPage
{
private:
std::deque<RPCEvent *> events;
void SendError(HTTPReply &reply, int64_t code, const char *message, const Anope::string &id)
{
Log(LOG_DEBUG) << "JSON-RPC error " << code << ": " << message;
// {"jsonrpc": "2.0", "error": {"code": -32601, "message": "Method not found"}, "id": "1"}
auto* doc = yyjson_mut_doc_new(nullptr);
auto* root = yyjson_mut_obj(doc);
yyjson_mut_doc_set_root(doc, root);
auto *error = yyjson_mut_obj(doc);
yyjson_mut_obj_add_sint(doc, error, "code", code);
yyjson_mut_obj_add_str(doc, error, "message", message);
yyjson_mut_obj_add_val(doc, root, "error", error);
yyjson_mut_obj_add_str(doc, root, "jsonrpc", "2.0");
if (id.empty())
yyjson_mut_obj_add_null(doc, root, "id");
else
yyjson_mut_obj_add_strn(doc, root, "id", id.c_str(), id.length());
auto *json = yyjson_mut_write(doc, YYJSON_WRITE_ALLOW_INVALID_UNICODE | YYJSON_WRITE_NEWLINE_AT_END, nullptr);
if (json)
{
reply.Write(json);
free(json);
}
yyjson_mut_doc_free(doc);
}
public:
MyJSONRPCServiceInterface(Module *creator, const Anope::string &sname)
: RPCServiceInterface(creator, sname)
, HTTPPage("/jsonrpc", "application/json")
{
}
void Register(RPCEvent *event) override
{
this->events.push_back(event);
}
void Unregister(RPCEvent *event) override
{
auto it = std::find(this->events.begin(), this->events.end(), event);
if (it != this->events.end())
this->events.erase(it);
}
bool OnRequest(HTTPProvider *provider, const Anope::string &page_name, HTTPClient *client, HTTPMessage &message, HTTPReply &reply) override
{
auto *doc = yyjson_read(message.content.c_str(), message.content.length(), YYJSON_READ_ALLOW_TRAILING_COMMAS | YYJSON_READ_ALLOW_INVALID_UNICODE);
if (!doc)
{
SendError(reply, -32700, "JSON parse error", "");
return true;
}
auto *root = yyjson_doc_get_root(doc);
if (!yyjson_is_obj(root))
{
// TODO: handle an array of JSON-RPC requests
yyjson_doc_free(doc);
SendError(reply, -32600, "Wrong JSON root element", "");
return true;
}
const auto id = yyjson_get_astr(root, "id");
const auto jsonrpc = yyjson_get_astr(root, "jsonrpc");
if (!jsonrpc.empty() && jsonrpc != "2.0")
{
yyjson_doc_free(doc);
SendError(reply, -32600, "Unsupported JSON-RPC version", id);
return true;
}
RPCRequest request(reply);
request.id = id;
request.name = yyjson_get_astr(root, "method");
auto *params = yyjson_obj_get(root, "params");
size_t idx, max;
yyjson_val *val;
yyjson_arr_foreach(params, idx, max, val)
{
const auto *str = yyjson_get_str(val);
request.data.push_back(str ? str : "");
}
yyjson_doc_free(doc);
for (auto *e : this->events)
{
if (!e->Run(this, client, request))
return false;
else if (!request.GetReplies().empty())
{
this->Reply(request);
return true;
}
}
// If we reached this point nobody handled the event.
SendError(reply, -32601, "Method not found", id);
return true;
}
void Reply(RPCRequest &request) override
{
// {"jsonrpc": "2.0", "method": "update", "params": [1,2,3,4,5]}
auto* doc = yyjson_mut_doc_new(nullptr);
auto* root = yyjson_mut_obj(doc);
yyjson_mut_doc_set_root(doc, root);
if (request.id.empty())
yyjson_mut_obj_add_null(doc, root, "id");
else
yyjson_mut_obj_add_strn(doc, root, "id", request.id.c_str(), request.id.length());
if (!request.GetReplies().empty())
{
auto *result = yyjson_mut_obj(doc);
for (const auto &[k, v] : request.GetReplies())
yyjson_mut_obj_add_strn(doc, result, k.c_str(), v.c_str(), v.length());
yyjson_mut_obj_add_val(doc, root, "result", result);
}
yyjson_mut_obj_add_str(doc, root, "jsonrpc", "2.0");
auto *json = yyjson_mut_write(doc, YYJSON_WRITE_ALLOW_INVALID_UNICODE | YYJSON_WRITE_NEWLINE_AT_END, nullptr);
if (json)
{
request.r.Write(json);
free(json);
}
yyjson_mut_doc_free(doc);
}
};
class ModuleJSONRPC final
: public Module
{
private:
ServiceReference<HTTPProvider> httpref;
MyJSONRPCServiceInterface jsonrpcinterface;
public:
ModuleJSONRPC(const Anope::string &modname, const Anope::string &creator)
: Module(modname, creator, EXTRA | VENDOR)
, jsonrpcinterface(this, "rpc")
{
}
~ModuleJSONRPC() override
{
if (httpref)
httpref->UnregisterPage(&jsonrpcinterface);
}
void OnReload(Configuration::Conf *conf) override
{
if (httpref)
httpref->UnregisterPage(&jsonrpcinterface);
this->httpref = ServiceReference<HTTPProvider>("HTTPProvider", conf->GetModule(this)->Get<const Anope::string>("server", "httpd/main"));
if (!httpref)
throw ConfigException("Unable to find http reference, is httpd loaded?");
httpref->RegisterPage(&jsonrpcinterface);
}
};
MODULE_INIT(ModuleJSONRPC)
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