/* spamfilter.* RPC calls
 * (C) Copyright 2022-.. Bram Matthys (Syzop) and the UnrealIRCd team
 * License: GPLv2 or later
 */

#include "unrealircd.h"

ModuleHeader MOD_HEADER
= {
	"rpc/spamfilter",
	"1.0.3",
	"spamfilter.* RPC calls",
	"UnrealIRCd Team",
	"unrealircd-6",
};

/* Forward declarations */
RPC_CALL_FUNC(rpc_spamfilter_list);
RPC_CALL_FUNC(rpc_spamfilter_get);
RPC_CALL_FUNC(rpc_spamfilter_del);
RPC_CALL_FUNC(rpc_spamfilter_add);

MOD_INIT()
{
	RPCHandlerInfo r;

	MARK_AS_OFFICIAL_MODULE(modinfo);

	memset(&r, 0, sizeof(r));
	r.method = "spamfilter.list";
	r.loglevel = ULOG_DEBUG;
	r.call = rpc_spamfilter_list;
	if (!RPCHandlerAdd(modinfo->handle, &r))
	{
		config_error("[rpc/spamfilter] Could not register RPC handler");
		return MOD_FAILED;
	}
	r.method = "spamfilter.get";
	r.loglevel = ULOG_DEBUG;
	r.call = rpc_spamfilter_get;
	if (!RPCHandlerAdd(modinfo->handle, &r))
	{
		config_error("[rpc/spamfilter] Could not register RPC handler");
		return MOD_FAILED;
	}
	r.method = "spamfilter.del";
	r.call = rpc_spamfilter_del;
	if (!RPCHandlerAdd(modinfo->handle, &r))
	{
		config_error("[rpc/spamfilter] Could not register RPC handler");
		return MOD_FAILED;
	}
	r.method = "spamfilter.add";
	r.call = rpc_spamfilter_add;
	if (!RPCHandlerAdd(modinfo->handle, &r))
	{
		config_error("[rpc/spamfilter] Could not register RPC handler");
		return MOD_FAILED;
	}

	return MOD_SUCCESS;
}

MOD_LOAD()
{
	return MOD_SUCCESS;
}

MOD_UNLOAD()
{
	return MOD_SUCCESS;
}

RPC_CALL_FUNC(rpc_spamfilter_list)
{
	json_t *result, *list, *item;
	int index;
	TKL *tkl;

	result = json_object();
	list = json_array();
	json_object_set_new(result, "list", list);

	for (index = 0; index < TKLISTLEN; index++)
	{
		for (tkl = tklines[index]; tkl; tkl = tkl->next)
		{
			if (TKLIsSpamfilter(tkl))
			{
				item = json_object();
				json_expand_tkl(item, NULL, tkl, 1);
				json_array_append_new(list, item);
			}
		}
	}

	rpc_response(client, request, result);
	json_decref(result);
}

/* Shared code for selecting a spamfilter, for .add/.del/get */
int spamfilter_select_criteria(Client *client, json_t *request, json_t *params, const char **name, int *match_type,
                               int *targets, char *targetbuf, size_t targetbuflen, BanActionValue *action, char *actionbuf)
{
	const char *str;
	int actval;

	*name = json_object_get_string(params, "name");
	if (!*name)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Missing parameter: 'name'");
		return 0;
	}

	str = json_object_get_string(params, "match_type");
	if (!str)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Missing parameter: 'match_type'");
		return 0;
	}
	*match_type = unreal_match_method_strtoval(str);
	if (!*match_type)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Invalid value for parameter 'match_type'");
		return 0;
	}

	str = json_object_get_string(params, "spamfilter_targets");
	if (!str)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Missing parameter: 'spamfilter_targets'");
		return 0;
	}
	*targets = spamfilter_gettargets(str, NULL);
	if (!*targets)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Invalid value(s) for parameter 'spamfilter_targets'");
		return 0;
	}
	strlcpy(targetbuf, spamfilter_target_inttostring(*targets), targetbuflen);

	str = json_object_get_string(params, "ban_action");
	if (!str)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Missing parameter: 'ban_action'");
		return 0;
	}
	*action = banact_stringtoval(str);
	if (!*action)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Invalid value for parameter 'ban_action'");
		return 0;
	}
	/* I hope to remove this restriction at a later point: */
	if (banact_config_only(*action))
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Invalid value for parameter 'ban_action': action is config-based only");
		return 0;
	}
	actionbuf[0] = banact_valtochar(*action);
	actionbuf[1] = '\0';
	return 1;
}

RPC_CALL_FUNC(rpc_spamfilter_get)
{
	json_t *result;
	const char *name;
	TKL *tkl;
	BanActionValue action;
	int match_type = 0;
	int targets = 0;
	char targetbuf[64];
	char actionbuf[2];

	if (!spamfilter_select_criteria(client, request, params, &name, &match_type, &targets, targetbuf, sizeof(targetbuf), &action, actionbuf))
		return; /* Error already communicated to client */

	/* For spamfilter.get we first try global spamfilters, then local. */
	tkl = find_tkl_spamfilter(TKL_SPAMF|TKL_GLOBAL, name, action, targets);
	if (!tkl)
	{
		tkl = find_tkl_spamfilter(TKL_SPAMF, name, action, targets);
		if (!tkl)
		{
			rpc_error(client, request, JSON_RPC_ERROR_NOT_FOUND, "Spamfilter not found");
			return;
		}
	}

	result = json_object();
	json_expand_tkl(result, "tkl", tkl, 1);
	rpc_response(client, request, result);
	json_decref(result);
}

RPC_CALL_FUNC(rpc_spamfilter_add)
{
	json_t *result;
	int type = TKL_SPAMF|TKL_GLOBAL;
	const char *str;
	const char *name, *reason;
	const char *set_by;
	time_t ban_duration = 0;
	TKL *tkl;
	Match *m;
	BanActionValue action;
	int match_type = 0;
	int targets = 0;
	char targetbuf[64];
	char actionbuf[2];
	char reasonbuf[512];
	char *err = NULL;

	if (!spamfilter_select_criteria(client, request, params, &name, &match_type, &targets, targetbuf, sizeof(targetbuf), &action, actionbuf))
		return; /* Error already communicated to client */

	/* Reason */
	reason = json_object_get_string(params, "reason");
	if (!reason)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Missing parameter: 'reason'");
		return;
	}

	/* Ban duration */
	if ((str = json_object_get_string(params, "ban_duration")))
	{
		ban_duration = config_checkval(str, CFG_TIME);
		if (ban_duration < 0)
		{
			rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Invalid value for parameter 'ban_duration'");
			return;
		}
	}

	OPTIONAL_PARAM_STRING("set_by", set_by);
	if (!set_by)
		set_by = client->rpc->issuer ? client->rpc->issuer : client->name;

	if (find_tkl_spamfilter(type, name, action, targets))
	{
		rpc_error(client, request, JSON_RPC_ERROR_ALREADY_EXISTS, "A spamfilter with that regex+action+target already exists");
		return;
	}

	/* Convert reason to use internal storage and wire format */
	reason = unreal_encodespace(reason);
	strlcpy(reasonbuf, reason, sizeof(reasonbuf));
	reason = reasonbuf;

	/* now check the regex / match field (only when adding) */
	m = unreal_create_match(match_type, name, &err);
	if (!m)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INVALID_PARAMS, "Invalid regex or match string specified");
		return;
	}

	tkl = tkl_add_spamfilter(type, NULL, targets, banact_value_to_struct(action), m, NULL, NULL, set_by, 0, TStime(),
	                         ban_duration, reason, INPUT_CONVERSION_DEFAULT, 0, 0);

	if (!tkl)
	{
		rpc_error(client, request, JSON_RPC_ERROR_INTERNAL_ERROR, "Unable to add item");
		return;
	}

	tkl_added(client, tkl);

	result = json_object();
	json_expand_tkl(result, "tkl", tkl, 1);
	rpc_response(client, request, result);
	json_decref(result);
}

RPC_CALL_FUNC(rpc_spamfilter_del)
{
	json_t *result;
	int type = TKL_SPAMF|TKL_GLOBAL;
	const char *name;
	const char *set_by;
	TKL *tkl;
	BanActionValue action;
	int match_type = 0;
	int targets = 0;
	char targetbuf[64];
	char actionbuf[2];
	const char *tkllayer[13];

	if (!spamfilter_select_criteria(client, request, params, &name, &match_type, &targets, targetbuf, sizeof(targetbuf), &action, actionbuf))
		return; /* Error already communicated to client */

	OPTIONAL_PARAM_STRING("set_by", set_by);
	if (!set_by)
		set_by = client->rpc->issuer ? client->rpc->issuer : client->name;

	tkl = find_tkl_spamfilter(type, name, action, targets);
	if (!tkl)
	{
		rpc_error(client, request, JSON_RPC_ERROR_NOT_FOUND, "Spamfilter not found");
		return;
	}

	result = json_object();
	json_expand_tkl(result, "tkl", tkl, 1);

	/* Wait.. this is a bit dull? */
	tkllayer[1] = "-";
	tkllayer[2] = "F";
	tkllayer[3] = targetbuf;
	tkllayer[4] = actionbuf;
	tkllayer[5] = set_by;
	tkllayer[6] = "-";
	tkllayer[7] = "0";
	tkllayer[8] = "0";
	tkllayer[9] = "-";
	tkllayer[10] = unreal_match_method_valtostr(match_type);
	tkllayer[11] = name;
	tkllayer[12] = NULL;

	cmd_tkl(NULL, &me, NULL, 12, tkllayer);

	tkl = find_tkl_spamfilter(type, name, action, targets);
	if (!tkl)
	{
		rpc_response(client, request, result);
	} else {
		/* Spamfilter still exists so failure to remove.
		 * Actually this may not be an internal error, it could be an
		 * incorrect request, such as asking to remove a config-based spamfilter.
		 */
		rpc_error(client, request, JSON_RPC_ERROR_INTERNAL_ERROR, "Unable to remove item");
		return;
	}
	json_decref(result);
}
