/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
 * See: http://wiki.inspircd.org/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#include "inspircd.h"
#include "u_listmode.h"

/* $ModDesc: Provides support for the +e channel mode */
/* $ModDep: ../../include/u_listmode.h */

/* Written by Om<om@inspircd.org>, April 2005. */
/* Rewritten to use the listmode utility by Om, December 2005 */
/* Adapted from m_exception, which was originally based on m_chanprotect and m_silence */

// The +e channel mode takes a nick!ident@host, glob patterns allowed,
// and if a user matches an entry on the +e list then they can join the channel, overriding any (+b) bans set on them
// Now supports CIDR and IP addresses -- Brain


/** Handles +e channel mode
 */
class BanException : public ListModeBase
{
 public:
	BanException(InspIRCd* Instance, Module* Creator) : ListModeBase(Instance, Creator, 'e', "End of Channel Exception List", 348, 349, true) { }
};


class ModuleBanException : public Module
{
	BanException be;

public:
	ModuleBanException(InspIRCd* Me) : Module(Me), be(Me, this)
	{
		if (!ServerInstance->Modes->AddMode(&be))
			throw ModuleException("Could not add new modes!");
		ServerInstance->Modules->PublishInterface("ChannelBanList", this);

		be.DoImplements(this);
		Implementation list[] = { I_OnRehash, I_OnRequest, I_On005Numeric, I_OnCheckBan, I_OnCheckExtBan, I_OnCheckStringExtBan };
		Me->Modules->Attach(list, this, 6);

	}

	virtual void On005Numeric(std::string &output)
	{
		output.append(" EXCEPTS=e");
	}

	virtual ModResult OnCheckExtBan(User *user, Channel *chan, char type)
	{
		if (chan != NULL)
		{
			modelist *list = be.extItem.get(chan);

			if (!list)
				return MOD_RES_PASSTHRU;

			std::string mask = std::string(user->nick) + "!" + user->ident + "@" + user->GetIPString();
			for (modelist::iterator it = list->begin(); it != list->end(); it++)
			{
				if (it->mask[0] != type || it->mask[1] != ':')
					continue;

				std::string maskptr = it->mask.substr(2);

				if (InspIRCd::Match(user->GetFullRealHost(), maskptr) || InspIRCd::Match(user->GetFullHost(), maskptr) || (InspIRCd::MatchCIDR(mask, maskptr)))
				{
					// They match an entry on the list, so let them pass this.
					return MOD_RES_ALLOW;
				}
			}
		}

		return MOD_RES_PASSTHRU;
	}

	virtual ModResult OnCheckStringExtBan(const std::string &str, Channel *chan, char type)
	{
		if (chan != NULL)
		{
			modelist *list = be.extItem.get(chan);

			if (!list)
				return MOD_RES_PASSTHRU;
			for (modelist::iterator it = list->begin(); it != list->end(); it++)
			{
				if (it->mask[0] != type || it->mask[1] != ':')
					continue;

				std::string maskptr = it->mask.substr(2);
				if (InspIRCd::Match(str, maskptr))
					// They match an entry on the list, so let them in.
					return MOD_RES_ALLOW;
			}
		}

		return MOD_RES_PASSTHRU;
	}

	virtual ModResult OnCheckBan(User* user, Channel* chan)
	{
		if (chan != NULL)
		{
			modelist *list = be.extItem.get(chan);

			if (!list)
			{
				// No list, proceed normally
				return MOD_RES_PASSTHRU;
			}

			std::string mask = std::string(user->nick) + "!" + user->ident + "@" + user->GetIPString();
			for (modelist::iterator it = list->begin(); it != list->end(); it++)
			{
				if (InspIRCd::Match(user->GetFullRealHost(), it->mask) || InspIRCd::Match(user->GetFullHost(), it->mask) || (InspIRCd::MatchCIDR(mask, it->mask)))
				{
					// They match an entry on the list, so let them in.
					return MOD_RES_ALLOW;
				}
			}
		}
		return MOD_RES_PASSTHRU;
	}

	virtual void OnCleanup(int target_type, void* item)
	{
		be.DoCleanup(target_type, item);
	}

	virtual void OnSyncChannel(Channel* chan, Module* proto, void* opaque)
	{
		be.DoSyncChannel(chan, proto, opaque);
	}

	virtual void OnRehash(User* user)
	{
		be.DoRehash();
	}

	virtual const char* OnRequest(Request* request)
	{
		return be.DoOnRequest(request);
	}

	virtual Version GetVersion()
	{
		return Version("$Id$", VF_COMMON | VF_VENDOR, API_VERSION);
	}

	virtual ~ModuleBanException()
	{
		ServerInstance->Modes->DelMode(&be);
		ServerInstance->Modules->UnpublishInterface("ChannelBanList", this);
	}
};

MODULE_INIT(ModuleBanException)