/*************************************************************************/
/*  upnp.cpp                                                             */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/

#include "upnp.h"

#include <miniupnpc/miniwget.h>
#include <miniupnpc/upnpcommands.h>

#include <stdlib.h>

bool UPNP::is_common_device(const String &dev) const {
	return dev.is_empty() ||
			dev.find("InternetGatewayDevice") >= 0 ||
			dev.find("WANIPConnection") >= 0 ||
			dev.find("WANPPPConnection") >= 0 ||
			dev.find("rootdevice") >= 0;
}

int UPNP::discover(int timeout, int ttl, const String &device_filter) {
	ERR_FAIL_COND_V_MSG(timeout < 0, UPNP_RESULT_INVALID_PARAM, "The response's wait time can't be negative.");
	ERR_FAIL_COND_V_MSG(ttl < 0 || ttl > 255, UPNP_RESULT_INVALID_PARAM, "The time-to-live must be set between 0 and 255 (inclusive).");

	devices.clear();

	int error = 0;
	struct UPNPDev *devlist;

	CharString cs = discover_multicast_if.utf8();
	const char *m_if = cs.length() ? cs.get_data() : nullptr;
	if (is_common_device(device_filter)) {
		devlist = upnpDiscover(timeout, m_if, nullptr, discover_local_port, discover_ipv6, ttl, &error);
	} else {
		devlist = upnpDiscoverAll(timeout, m_if, nullptr, discover_local_port, discover_ipv6, ttl, &error);
	}

	if (error != UPNPDISCOVER_SUCCESS) {
		switch (error) {
			case UPNPDISCOVER_SOCKET_ERROR:
				return UPNP_RESULT_SOCKET_ERROR;
			case UPNPDISCOVER_MEMORY_ERROR:
				return UPNP_RESULT_MEM_ALLOC_ERROR;
			default:
				return UPNP_RESULT_UNKNOWN_ERROR;
		}
	}

	if (!devlist) {
		return UPNP_RESULT_NO_DEVICES;
	}

	struct UPNPDev *dev = devlist;

	while (dev) {
		if (device_filter.is_empty() || strstr(dev->st, device_filter.utf8().get_data())) {
			add_device_to_list(dev, devlist);
		}

		dev = dev->pNext;
	}

	freeUPNPDevlist(devlist);

	return UPNP_RESULT_SUCCESS;
}

void UPNP::add_device_to_list(UPNPDev *dev, UPNPDev *devlist) {
	Ref<UPNPDevice> new_device;
	new_device.instantiate();

	new_device->set_description_url(dev->descURL);
	new_device->set_service_type(dev->st);

	parse_igd(new_device, devlist);

	devices.push_back(new_device);
}

char *UPNP::load_description(const String &url, int *size, int *status_code) const {
	return (char *)miniwget(url.utf8().get_data(), size, 0, status_code);
}

void UPNP::parse_igd(Ref<UPNPDevice> dev, UPNPDev *devlist) {
	int size = 0;
	int status_code = -1;
	char *xml = load_description(dev->get_description_url(), &size, &status_code);

	if (status_code != 200) {
		dev->set_igd_status(UPNPDevice::IGD_STATUS_HTTP_ERROR);
		return;
	}

	if (!xml || size < 1) {
		dev->set_igd_status(UPNPDevice::IGD_STATUS_HTTP_EMPTY);
		return;
	}

	struct UPNPUrls *urls = (UPNPUrls *)malloc(sizeof(struct UPNPUrls));

	if (!urls) {
		dev->set_igd_status(UPNPDevice::IGD_STATUS_MALLOC_ERROR);
		return;
	}

	struct IGDdatas data;

	memset(urls, 0, sizeof(struct UPNPUrls));

	parserootdesc(xml, size, &data);
	free(xml);
	xml = nullptr;

	GetUPNPUrls(urls, &data, dev->get_description_url().utf8().get_data(), 0);

	if (!urls) {
		dev->set_igd_status(UPNPDevice::IGD_STATUS_NO_URLS);
		return;
	}

	char addr[16];
	int i = UPNP_GetValidIGD(devlist, urls, &data, (char *)&addr, 16);

	if (i != 1) {
		FreeUPNPUrls(urls);

		switch (i) {
			case 0:
				dev->set_igd_status(UPNPDevice::IGD_STATUS_NO_IGD);
				return;
			case 2:
				dev->set_igd_status(UPNPDevice::IGD_STATUS_DISCONNECTED);
				return;
			case 3:
				dev->set_igd_status(UPNPDevice::IGD_STATUS_UNKNOWN_DEVICE);
				return;
			default:
				dev->set_igd_status(UPNPDevice::IGD_STATUS_UNKNOWN_ERROR);
				return;
		}
	}

	if (urls->controlURL[0] == '\0') {
		FreeUPNPUrls(urls);
		dev->set_igd_status(UPNPDevice::IGD_STATUS_INVALID_CONTROL);
		return;
	}

	dev->set_igd_control_url(urls->controlURL);
	dev->set_igd_service_type(data.first.servicetype);
	dev->set_igd_our_addr(addr);
	dev->set_igd_status(UPNPDevice::IGD_STATUS_OK);

	FreeUPNPUrls(urls);
}

int UPNP::upnp_result(int in) {
	switch (in) {
		case UPNPCOMMAND_SUCCESS:
			return UPNP_RESULT_SUCCESS;
		case UPNPCOMMAND_UNKNOWN_ERROR:
			return UPNP_RESULT_UNKNOWN_ERROR;
		case UPNPCOMMAND_INVALID_ARGS:
			return UPNP_RESULT_INVALID_ARGS;
		case UPNPCOMMAND_HTTP_ERROR:
			return UPNP_RESULT_HTTP_ERROR;
		case UPNPCOMMAND_INVALID_RESPONSE:
			return UPNP_RESULT_INVALID_RESPONSE;
		case UPNPCOMMAND_MEM_ALLOC_ERROR:
			return UPNP_RESULT_MEM_ALLOC_ERROR;

		case 402:
			return UPNP_RESULT_INVALID_ARGS;
		case 403:
			return UPNP_RESULT_NOT_AUTHORIZED;
		case 501:
			return UPNP_RESULT_ACTION_FAILED;
		case 606:
			return UPNP_RESULT_NOT_AUTHORIZED;
		case 714:
			return UPNP_RESULT_NO_SUCH_ENTRY_IN_ARRAY;
		case 715:
			return UPNP_RESULT_SRC_IP_WILDCARD_NOT_PERMITTED;
		case 716:
			return UPNP_RESULT_EXT_PORT_WILDCARD_NOT_PERMITTED;
		case 718:
			return UPNP_RESULT_CONFLICT_WITH_OTHER_MAPPING;
		case 724:
			return UPNP_RESULT_SAME_PORT_VALUES_REQUIRED;
		case 725:
			return UPNP_RESULT_ONLY_PERMANENT_LEASE_SUPPORTED;
		case 726:
			return UPNP_RESULT_REMOTE_HOST_MUST_BE_WILDCARD;
		case 727:
			return UPNP_RESULT_EXT_PORT_MUST_BE_WILDCARD;
		case 728:
			return UPNP_RESULT_NO_PORT_MAPS_AVAILABLE;
		case 729:
			return UPNP_RESULT_CONFLICT_WITH_OTHER_MECHANISM;
		case 732:
			return UPNP_RESULT_INT_PORT_WILDCARD_NOT_PERMITTED;
		case 733:
			return UPNP_RESULT_INCONSISTENT_PARAMETERS;
	}

	return UPNP_RESULT_UNKNOWN_ERROR;
}

int UPNP::get_device_count() const {
	return devices.size();
}

Ref<UPNPDevice> UPNP::get_device(int index) const {
	ERR_FAIL_INDEX_V(index, devices.size(), nullptr);

	return devices.get(index);
}

void UPNP::add_device(Ref<UPNPDevice> device) {
	ERR_FAIL_COND(device == nullptr);

	devices.push_back(device);
}

void UPNP::set_device(int index, Ref<UPNPDevice> device) {
	ERR_FAIL_INDEX(index, devices.size());
	ERR_FAIL_COND(device == nullptr);

	devices.set(index, device);
}

void UPNP::remove_device(int index) {
	ERR_FAIL_INDEX(index, devices.size());

	devices.remove(index);
}

void UPNP::clear_devices() {
	devices.clear();
}

Ref<UPNPDevice> UPNP::get_gateway() const {
	ERR_FAIL_COND_V_MSG(devices.size() < 1, nullptr, "Couldn't find any UPNPDevices.");

	for (int i = 0; i < devices.size(); i++) {
		Ref<UPNPDevice> dev = get_device(i);

		if (dev != nullptr && dev->is_valid_gateway()) {
			return dev;
		}
	}

	return nullptr;
}

void UPNP::set_discover_multicast_if(const String &m_if) {
	discover_multicast_if = m_if;
}

String UPNP::get_discover_multicast_if() const {
	return discover_multicast_if;
}

void UPNP::set_discover_local_port(int port) {
	discover_local_port = port;
}

int UPNP::get_discover_local_port() const {
	return discover_local_port;
}

void UPNP::set_discover_ipv6(bool ipv6) {
	discover_ipv6 = ipv6;
}

bool UPNP::is_discover_ipv6() const {
	return discover_ipv6;
}

String UPNP::query_external_address() const {
	Ref<UPNPDevice> dev = get_gateway();

	if (dev == nullptr) {
		return "";
	}

	return dev->query_external_address();
}

int UPNP::add_port_mapping(int port, int port_internal, String desc, String proto, int duration) const {
	Ref<UPNPDevice> dev = get_gateway();

	if (dev == nullptr) {
		return UPNP_RESULT_NO_GATEWAY;
	}

	dev->delete_port_mapping(port, proto);

	return dev->add_port_mapping(port, port_internal, desc, proto, duration);
}

int UPNP::delete_port_mapping(int port, String proto) const {
	Ref<UPNPDevice> dev = get_gateway();

	if (dev == nullptr) {
		return UPNP_RESULT_NO_GATEWAY;
	}

	return dev->delete_port_mapping(port, proto);
}

void UPNP::_bind_methods() {
	ClassDB::bind_method(D_METHOD("get_device_count"), &UPNP::get_device_count);
	ClassDB::bind_method(D_METHOD("get_device", "index"), &UPNP::get_device);
	ClassDB::bind_method(D_METHOD("add_device", "device"), &UPNP::add_device);
	ClassDB::bind_method(D_METHOD("set_device", "index", "device"), &UPNP::set_device);
	ClassDB::bind_method(D_METHOD("remove_device", "index"), &UPNP::remove_device);
	ClassDB::bind_method(D_METHOD("clear_devices"), &UPNP::clear_devices);

	ClassDB::bind_method(D_METHOD("get_gateway"), &UPNP::get_gateway);

	ClassDB::bind_method(D_METHOD("discover", "timeout", "ttl", "device_filter"), &UPNP::discover, DEFVAL(2000), DEFVAL(2), DEFVAL("InternetGatewayDevice"));

	ClassDB::bind_method(D_METHOD("query_external_address"), &UPNP::query_external_address);

	ClassDB::bind_method(D_METHOD("add_port_mapping", "port", "port_internal", "desc", "proto", "duration"), &UPNP::add_port_mapping, DEFVAL(0), DEFVAL(""), DEFVAL("UDP"), DEFVAL(0));
	ClassDB::bind_method(D_METHOD("delete_port_mapping", "port", "proto"), &UPNP::delete_port_mapping, DEFVAL("UDP"));

	ClassDB::bind_method(D_METHOD("set_discover_multicast_if", "m_if"), &UPNP::set_discover_multicast_if);
	ClassDB::bind_method(D_METHOD("get_discover_multicast_if"), &UPNP::get_discover_multicast_if);
	ADD_PROPERTY(PropertyInfo(Variant::STRING, "discover_multicast_if"), "set_discover_multicast_if", "get_discover_multicast_if");

	ClassDB::bind_method(D_METHOD("set_discover_local_port", "port"), &UPNP::set_discover_local_port);
	ClassDB::bind_method(D_METHOD("get_discover_local_port"), &UPNP::get_discover_local_port);
	ADD_PROPERTY(PropertyInfo(Variant::INT, "discover_local_port", PROPERTY_HINT_RANGE, "0,65535"), "set_discover_local_port", "get_discover_local_port");

	ClassDB::bind_method(D_METHOD("set_discover_ipv6", "ipv6"), &UPNP::set_discover_ipv6);
	ClassDB::bind_method(D_METHOD("is_discover_ipv6"), &UPNP::is_discover_ipv6);
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "discover_ipv6"), "set_discover_ipv6", "is_discover_ipv6");

	BIND_ENUM_CONSTANT(UPNP_RESULT_SUCCESS);
	BIND_ENUM_CONSTANT(UPNP_RESULT_NOT_AUTHORIZED);
	BIND_ENUM_CONSTANT(UPNP_RESULT_PORT_MAPPING_NOT_FOUND);
	BIND_ENUM_CONSTANT(UPNP_RESULT_INCONSISTENT_PARAMETERS);
	BIND_ENUM_CONSTANT(UPNP_RESULT_NO_SUCH_ENTRY_IN_ARRAY);
	BIND_ENUM_CONSTANT(UPNP_RESULT_ACTION_FAILED);
	BIND_ENUM_CONSTANT(UPNP_RESULT_SRC_IP_WILDCARD_NOT_PERMITTED);
	BIND_ENUM_CONSTANT(UPNP_RESULT_EXT_PORT_WILDCARD_NOT_PERMITTED);
	BIND_ENUM_CONSTANT(UPNP_RESULT_INT_PORT_WILDCARD_NOT_PERMITTED);
	BIND_ENUM_CONSTANT(UPNP_RESULT_REMOTE_HOST_MUST_BE_WILDCARD);
	BIND_ENUM_CONSTANT(UPNP_RESULT_EXT_PORT_MUST_BE_WILDCARD);
	BIND_ENUM_CONSTANT(UPNP_RESULT_NO_PORT_MAPS_AVAILABLE);
	BIND_ENUM_CONSTANT(UPNP_RESULT_CONFLICT_WITH_OTHER_MECHANISM);
	BIND_ENUM_CONSTANT(UPNP_RESULT_CONFLICT_WITH_OTHER_MAPPING);
	BIND_ENUM_CONSTANT(UPNP_RESULT_SAME_PORT_VALUES_REQUIRED);
	BIND_ENUM_CONSTANT(UPNP_RESULT_ONLY_PERMANENT_LEASE_SUPPORTED);
	BIND_ENUM_CONSTANT(UPNP_RESULT_INVALID_GATEWAY);
	BIND_ENUM_CONSTANT(UPNP_RESULT_INVALID_PORT);
	BIND_ENUM_CONSTANT(UPNP_RESULT_INVALID_PROTOCOL);
	BIND_ENUM_CONSTANT(UPNP_RESULT_INVALID_DURATION);
	BIND_ENUM_CONSTANT(UPNP_RESULT_INVALID_ARGS);
	BIND_ENUM_CONSTANT(UPNP_RESULT_INVALID_RESPONSE);
	BIND_ENUM_CONSTANT(UPNP_RESULT_INVALID_PARAM);
	BIND_ENUM_CONSTANT(UPNP_RESULT_HTTP_ERROR);
	BIND_ENUM_CONSTANT(UPNP_RESULT_SOCKET_ERROR);
	BIND_ENUM_CONSTANT(UPNP_RESULT_MEM_ALLOC_ERROR);
	BIND_ENUM_CONSTANT(UPNP_RESULT_NO_GATEWAY);
	BIND_ENUM_CONSTANT(UPNP_RESULT_NO_DEVICES);
	BIND_ENUM_CONSTANT(UPNP_RESULT_UNKNOWN_ERROR);
}

UPNP::UPNP() {
}

UPNP::~UPNP() {
}