Add transitional support to access control

src/access/AccessControl.cpp

@@ -83,6 +83,9 @@ CHIP_ERROR AccessControl::Finish()
 CHIP_ERROR AccessControl::Check(const SubjectDescriptor & subjectDescriptor, const RequestPath & requestPath,
                                 Privilege requestPrivilege)
 {
+    // During development, allow access if delegate is transitional
+    ReturnErrorCodeIf(mDelegate.IsTransitional(), CHIP_NO_ERROR);
+
     EntryIterator iterator;
     ReturnErrorOnFailure(Entries(iterator, &subjectDescriptor.fabricIndex));
 

src/access/AccessControl.h

@@ -319,6 +319,9 @@ class AccessControl
             return CHIP_ERROR_NOT_IMPLEMENTED;
         }
 
+        // Transitional (during development, will be removed later)
+        virtual bool IsTransitional() const { return true; }
+
         // Listening
         virtual void SetListener(Listener & listener) { mListener = &listener; }
         virtual void ClearListener() { mListener = nullptr; }

src/access/examples/ExampleAccessControlDelegate.cpp

@@ -1081,6 +1081,8 @@ class AccessControlDelegate : public AccessControl::Delegate
         return CHIP_ERROR_BUFFER_TOO_SMALL;
     }
 
+    bool IsTransitional() const override { return false; }
+
 private:
     CHIP_ERROR LoadFromFlash() { return CHIP_NO_ERROR; }