From 302053cf8f5378da7f23e5d2f68a24c9d2325351 Mon Sep 17 00:00:00 2001
From: Attila Molnar <attilamolnar@hush.com>
Date: Sat, 5 Dec 2015 15:58:48 +0100
Subject: m_cap Provide the OnCapValueChange event and add
 Cap::Manager::NotifyValueChange()

---
 include/modules/cap.h | 20 ++++++++++++++++++++
 src/modules/m_cap.cpp |  6 ++++++
 2 files changed, 26 insertions(+)

diff --git a/include/modules/cap.h b/include/modules/cap.h
index e05263ad3..6f91f5aee 100644
--- a/include/modules/cap.h
+++ b/include/modules/cap.h
@@ -55,6 +55,11 @@ namespace Cap
 		 * @param add If true, the capability is being added, otherwise its being removed
 		 */
 		virtual void OnCapAddDel(Capability* cap, bool add) = 0;
+
+		/** Called whenever the value of a cap changes.
+		 * @param cap Capability whose value changed
+		 */
+		virtual void OnCapValueChange(Capability* cap) { }
 	};
 
 	class Manager : public DataProvider
@@ -82,6 +87,11 @@ namespace Cap
 		 * @return Capability object pointer if found, NULL otherwise
 		 */
 		virtual Capability* Find(const std::string& name) const = 0;
+
+		/** Notify manager when a value of a cap changed
+		 * @param cap Cap whose value changed
+		 */
+		virtual void NotifyValueChange(Capability* cap) = 0;
 	};
 
 	/** Represents a client capability.
@@ -135,6 +145,16 @@ namespace Cap
 
 		friend class ManagerImpl;
 
+	 protected:
+		/** Notify the manager that the value of the capability changed.
+		 * Must be called if the value of the cap changes for any reason.
+		 */
+		void NotifyValueChange()
+		{
+			if (IsRegistered())
+				manager->NotifyValueChange(this);
+		}
+
 	 public:
 		/** Constructor, initializes the capability.
 		 * Caps are active by default.
diff --git a/src/modules/m_cap.cpp b/src/modules/m_cap.cpp
index a6b5aa900..e1593e33f 100644
--- a/src/modules/m_cap.cpp
+++ b/src/modules/m_cap.cpp
@@ -122,6 +122,12 @@ class Cap::ManagerImpl : public Cap::Manager
 		return NULL;
 	}
 
+	void NotifyValueChange(Capability* cap) CXX11_OVERRIDE
+	{
+		ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Cap %s changed value", cap->GetName().c_str());
+		FOREACH_MOD_CUSTOM(evprov, Cap::EventListener, OnCapValueChange, (cap));
+	}
+
 	Protocol GetProtocol(LocalUser* user) const
 	{
 		return ((capext.get(user) & CAP_302_BIT) ? CAP_302 : CAP_LEGACY);
-- 
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