feat(Core/Scripts): new OnBeforeFinalizePlayerWorldSession() hook (#7136)

Co-authored-by: Yehonal <yehonal.azeroth@gmail.com>

doc/changelog/pendings/changes_1629216324271376300.md

@@ -0,0 +1,3 @@
+### Added
+
+- Added `OnBeforeFinalizePlayerWorldSession ` that can be used to modify the cache version that is sent to the client via modules.

src/server/game/Scripting/ScriptMgr.cpp

@@ -408,6 +408,11 @@ void ScriptMgr::OnAfterConfigLoad(bool reload)
     FOREACH_SCRIPT(WorldScript)->OnAfterConfigLoad(reload);
 }
 
+void ScriptMgr::OnBeforeFinalizePlayerWorldSession(uint32& cacheVersion)
+{
+    FOREACH_SCRIPT(WorldScript)->OnBeforeFinalizePlayerWorldSession(cacheVersion);
+}
+
 void ScriptMgr::OnMotdChange(std::string& newMotd)
 {
     FOREACH_SCRIPT(WorldScript)->OnMotdChange(newMotd);

src/server/game/Scripting/ScriptMgr.h

@@ -194,6 +194,13 @@ public:
 
     // Called when the world is actually shut down.
     virtual void OnShutdown() { }
+
+    /**
+     * @brief This hook runs before finalizing the player world session. Can be also used to mutate the cache version of the Client.
+     *
+     * @param version The cache version that we will be sending to the Client.
+     */
+    virtual void OnBeforeFinalizePlayerWorldSession(uint32& /*cacheVersion*/) {}
 };
 
 class FormulaScript : public ScriptObject
@@ -1466,6 +1473,7 @@ public: /* WorldScript */
     void OnOpenStateChange(bool open);
     void OnBeforeConfigLoad(bool reload);
     void OnAfterConfigLoad(bool reload);
+    void OnBeforeFinalizePlayerWorldSession(uint32& cacheVersion);
     void OnMotdChange(std::string& newMotd);
     void OnShutdownInitiate(ShutdownExitCode code, ShutdownMask mask);
     void OnShutdownCancel();

src/server/game/World/World.cpp

@@ -312,9 +312,8 @@ void World::AddSession_(WorldSession* s)
     }
 
     s->SendAuthResponse(AUTH_OK, true);
-    s->SendAddonsInfo();
+
-    s->SendClientCacheVersion(sWorld->getIntConfig(CONFIG_CLIENTCACHE_VERSION));
+    FinalizePlayerWorldSession(s);
-    s->SendTutorialsData();
 
     UpdateMaxSessionCounters();
 }
@@ -397,11 +396,9 @@ bool World::RemoveQueuedPlayer(WorldSession* sess)
         pop_sess->SetInQueue(false);
         pop_sess->ResetTimeOutTime(false);
         pop_sess->SendAuthWaitQue(0);
-        pop_sess->SendAddonsInfo();
-
-        pop_sess->SendClientCacheVersion(sWorld->getIntConfig(CONFIG_CLIENTCACHE_VERSION));
         pop_sess->SendAccountDataTimes(GLOBAL_CACHE_MASK);
-        pop_sess->SendTutorialsData();
+
+        FinalizePlayerWorldSession(pop_sess);
 
         m_QueuedPlayer.pop_front();
 
@@ -3480,3 +3477,13 @@ uint32 World::GetNextWhoListUpdateDelaySecs()
 
     return uint32(ceil(t / 1000.0f));
 }
+
+void World::FinalizePlayerWorldSession(WorldSession* session)
+{
+    uint32 cacheVersion = sWorld->getIntConfig(CONFIG_CLIENTCACHE_VERSION);
+    sScriptMgr->OnBeforeFinalizePlayerWorldSession(cacheVersion);
+
+    session->SendAddonsInfo();
+    session->SendClientCacheVersion(cacheVersion);
+    session->SendTutorialsData();
+}

src/server/game/World/World.h

@@ -486,6 +486,13 @@ private:
 
     void ProcessQueryCallbacks();
     QueryCallbackProcessor _queryProcessor;
+
+    /**
+     * @brief Executed when a World Session is being finalized. Be it from a normal login or via queue popping.
+     *
+     * @param session The World Session that we are finalizing.
+     */
+    inline void FinalizePlayerWorldSession(WorldSession* session);
 };
 
 std::unique_ptr<IWorld>& getWorldInstance();