From 9ac2eae1f0d663cb3b2fc05d6d37b07dcfd9025e Mon Sep 17 00:00:00 2001
From: Attila Molnar <attilamolnar@hush.com>
Date: Sat, 5 Dec 2015 15:45:20 +0100
Subject: m_cap Learn the supported capability negotiation protocol of a client
 from CAP LS

Let modules implementing caps query this information
---
 include/modules/cap.h | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'include')

diff --git a/include/modules/cap.h b/include/modules/cap.h
index a00089260..1ad2ff2f1 100644
--- a/include/modules/cap.h
+++ b/include/modules/cap.h
@@ -23,11 +23,24 @@
 
 namespace Cap
 {
-	static const unsigned int MAX_CAPS = sizeof(intptr_t) * 8;
+	static const unsigned int MAX_CAPS = (sizeof(intptr_t) * 8) - 1;
+	static const intptr_t CAP_302_BIT = (intptr_t)1 << MAX_CAPS;
+
 	typedef intptr_t Ext;
 	typedef LocalIntExt ExtItem;
 	class Capability;
 
+	enum Protocol
+	{
+		/** Supports capability negotiation protocol v3.1, or none
+		 */
+		CAP_LEGACY,
+
+		/** Supports capability negotiation v3.2
+		 */
+		CAP_302
+	};
+
 	class Manager : public DataProvider
 	{
 	 public:
@@ -190,6 +203,16 @@ namespace Cap
 		 */
 		bool IsRegistered() const { return (extitem != NULL); }
 
+		/** Get the CAP negotiation protocol version of a user.
+		 * The cap must be registered for this to return anything other than CAP_LEGACY.
+		 * @param user User whose negotiation protocol version to query
+		 * @return One of the Capability::Protocol enum indicating the highest supported capability negotiation protocol version
+		 */
+		Protocol GetProtocol(LocalUser* user) const
+		{
+			return ((IsRegistered() && (extitem->get(user) & CAP_302_BIT)) ? CAP_302 : CAP_LEGACY);
+		}
+
 		/** Called when a user requests to turn this capability on or off.
 		 * @param user User requesting to change the state of the cap
 		 * @param add True if requesting to turn the cap on, false if requesting to turn it off
-- 
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