From 81027f3a0888ac4c8e3fb6ea90081492defce946 Mon Sep 17 00:00:00 2001
From: Peter Powell <petpow@saberuk.com>
Date: Mon, 20 Mar 2017 11:43:24 +0000
Subject: Move the OnCheckExemption hook out of the core.

---
 src/coremods/core_channel/cmd_topic.cpp    | 12 ++++++--
 src/coremods/core_channel/core_channel.cpp | 45 ++++++++++++++++++++++++++++--
 src/coremods/core_channel/core_channel.h   |  2 ++
 3 files changed, 53 insertions(+), 6 deletions(-)

(limited to 'src/coremods/core_channel')

diff --git a/src/coremods/core_channel/cmd_topic.cpp b/src/coremods/core_channel/cmd_topic.cpp
index 6d99edcc6..ec6ed9744 100644
--- a/src/coremods/core_channel/cmd_topic.cpp
+++ b/src/coremods/core_channel/cmd_topic.cpp
@@ -25,6 +25,7 @@
 
 CommandTopic::CommandTopic(Module* parent)
 	: SplitCommand(parent, "TOPIC", 1, 2)
+	, exemptionprov(parent)
 	, secretmode(parent, "secret")
 	, topiclockmode(parent, "topiclock")
 {
@@ -73,10 +74,15 @@ CmdResult CommandTopic::HandleLocal(const std::vector<std::string>& parameters,
 			user->WriteNumeric(ERR_NOTONCHANNEL, c->name, "You're not on that channel!");
 			return CMD_FAILURE;
 		}
-		if (c->IsModeSet(topiclockmode) && !ServerInstance->OnCheckExemption(user, c, "topiclock").check(c->GetPrefixValue(user) >= HALFOP_VALUE))
+		if (c->IsModeSet(topiclockmode))
 		{
-			user->WriteNumeric(ERR_CHANOPRIVSNEEDED, c->name, "You do not have access to change the topic on this channel");
-			return CMD_FAILURE;
+			ModResult MOD_RESULT;
+			FIRST_MOD_RESULT_CUSTOM(exemptionprov, CheckExemption::EventListener, OnCheckExemption, MOD_RESULT, (user, c, "topiclock"));
+			if (!MOD_RESULT.check(c->GetPrefixValue(user) >= HALFOP_VALUE))
+			{
+				user->WriteNumeric(ERR_CHANOPRIVSNEEDED, c->name, "You do not have access to change the topic on this channel");
+				return CMD_FAILURE;
+			}
 		}
 	}
 
diff --git a/src/coremods/core_channel/core_channel.cpp b/src/coremods/core_channel/core_channel.cpp
index aba4d9769..b77aac7e2 100644
--- a/src/coremods/core_channel/core_channel.cpp
+++ b/src/coremods/core_channel/core_channel.cpp
@@ -21,7 +21,7 @@
 #include "core_channel.h"
 #include "invite.h"
 
-class CoreModChannel : public Module
+class CoreModChannel : public Module, public CheckExemption::EventListener
 {
 	Invite::APIImpl invapi;
 	CommandInvite cmdinvite;
@@ -29,6 +29,7 @@ class CoreModChannel : public Module
 	CommandKick cmdkick;
 	CommandNames cmdnames;
 	CommandTopic cmdtopic;
+	insp::flat_map<std::string, char> exemptions;
 
 	ModResult IsInvited(User* user, Channel* chan)
 	{
@@ -40,8 +41,13 @@ class CoreModChannel : public Module
 
  public:
 	CoreModChannel()
-		: invapi(this)
-		, cmdinvite(this, invapi), cmdjoin(this), cmdkick(this), cmdnames(this), cmdtopic(this)
+		: CheckExemption::EventListener(this)
+		, invapi(this)
+		, cmdinvite(this, invapi)
+		, cmdjoin(this)
+		, cmdkick(this)
+		, cmdnames(this)
+		, cmdtopic(this)
 	{
 	}
 
@@ -56,6 +62,23 @@ class CoreModChannel : public Module
 			for (unsigned int i = 0; i < sizeof(events)/sizeof(Implementation); i++)
 				ServerInstance->Modules.Detach(events[i], this);
 		}
+
+		std::string current;
+		irc::spacesepstream defaultstream(optionstag->getString("exemptchanops"));
+		insp::flat_map<std::string, char> exempts;
+		while (defaultstream.GetToken(current))
+		{
+			std::string::size_type pos = current.find(':');
+			if (pos == std::string::npos || (pos + 2) > current.size())
+				throw ModuleException("Invalid exemptchanops value '" + current + "' at " + optionstag->getTagLocation());
+
+			const std::string restriction = current.substr(0, pos);
+			const char prefix = current[pos + 1];
+
+			ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Exempting prefix %c from %s", prefix, restriction.c_str());
+			exempts[restriction] = prefix;
+		}
+		exemptions.swap(exempts);
 	}
 
 	void OnPostJoin(Membership* memb) CXX11_OVERRIDE
@@ -110,6 +133,22 @@ class CoreModChannel : public Module
 		invapi.RemoveAll(chan);
 	}
 
+	ModResult OnCheckExemption(User* user, Channel* chan, const std::string& restriction) CXX11_OVERRIDE
+	{
+		if (!exemptions.count(restriction))
+			return MOD_RES_PASSTHRU;
+
+		unsigned int mypfx = chan->GetPrefixValue(user);
+		char minmode = exemptions[restriction];
+
+		PrefixMode* mh = ServerInstance->Modes->FindPrefixMode(minmode);
+		if (mh && mypfx >= mh->GetPrefixRank())
+			return MOD_RES_ALLOW;
+		if (mh || minmode == '*')
+			return MOD_RES_DENY;
+		return MOD_RES_PASSTHRU;
+	}
+
 	void Prioritize() CXX11_OVERRIDE
 	{
 		ServerInstance->Modules.SetPriority(this, I_OnPostJoin, PRIORITY_FIRST);
diff --git a/src/coremods/core_channel/core_channel.h b/src/coremods/core_channel/core_channel.h
index 0dafde8cb..19a984827 100644
--- a/src/coremods/core_channel/core_channel.h
+++ b/src/coremods/core_channel/core_channel.h
@@ -20,6 +20,7 @@
 #pragma once
 
 #include "inspircd.h"
+#include "modules/exemption.h"
 
 namespace Topic
 {
@@ -72,6 +73,7 @@ class CommandJoin : public SplitCommand
  */
 class CommandTopic : public SplitCommand
 {
+	CheckExemption::EventProvider exemptionprov;
 	ChanModeReference secretmode;
 	ChanModeReference topiclockmode;
 
-- 
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