Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.IdentityModel/System/IdentityModel/Policy/IAuthorizationPolicy.cs

@@ -0,0 +1,21 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.IdentityModel.Policy
+{
+    using System.IdentityModel.Claims;
+
+    // Issues claimsets whose conditions (if any) have been evaluated.
+    public interface IAuthorizationPolicy : IAuthorizationComponent
+    {
+        ClaimSet Issuer { get; }
+
+        // Evaluates conditions (if any) against the context, may add grants to the context
+        // Return 'false' if for this evaluation, should be called again if claims change. (eg. not done)
+        // Return 'true' if no more claims will be added regardless of changes for this evaluation (eg. done).
+        // 'state' is good for this evaluation only. Will be null if starting again.
+        // Implementations should expect to be called multiple times on different threads.
+        bool Evaluate(EvaluationContext evaluationContext, ref object state);
+    }
+}