split up CallCredentials.cs into multiple files

src/csharp/Grpc.Core/CallCredentials.cs

@@ -57,73 +57,4 @@ namespace Grpc.Core
         /// <returns>The native credentials.</returns>
         internal abstract CallCredentialsSafeHandle ToNativeCredentials();
     }
-
-    /// <summary>
-    /// Client-side credentials that delegate metadata based auth to an interceptor.
-    /// The interceptor is automatically invoked for each remote call that uses <c>MetadataCredentials.</c>
-    /// </summary>
-    internal sealed class MetadataCredentials : CallCredentials
-    {
-        readonly AsyncAuthInterceptor interceptor;
-
-        /// <summary>
-        /// Initializes a new instance of <c>MetadataCredentials</c> class.
-        /// </summary>
-        /// <param name="interceptor">authentication interceptor</param>
-        public MetadataCredentials(AsyncAuthInterceptor interceptor)
-        {
-            this.interceptor = GrpcPreconditions.CheckNotNull(interceptor);
-        }
-
-        internal override CallCredentialsSafeHandle ToNativeCredentials()
-        {
-            NativeMetadataCredentialsPlugin plugin = new NativeMetadataCredentialsPlugin(interceptor);
-            return plugin.Credentials;
-        }
-    }
-
-    /// <summary>
-    /// Credentials that allow composing multiple credentials objects into one <see cref="CallCredentials"/> object.
-    /// </summary>
-    internal sealed class CompositeCallCredentials : CallCredentials
-    {
-        readonly List<CallCredentials> credentials;
-
-        /// <summary>
-        /// Initializes a new instance of <c>CompositeCallCredentials</c> class.
-        /// The resulting credentials object will be composite of all the credentials specified as parameters.
-        /// </summary>
-        /// <param name="credentials">credentials to compose</param>
-        public CompositeCallCredentials(params CallCredentials[] credentials)
-        {
-            GrpcPreconditions.CheckArgument(credentials.Length >= 2, "Composite credentials object can only be created from 2 or more credentials.");
-            this.credentials = new List<CallCredentials>(credentials);
-        }
-
-        internal override CallCredentialsSafeHandle ToNativeCredentials()
-        {
-            return ToNativeRecursive(0);
-        }
-
-        // Recursive descent makes managing lifetime of intermediate CredentialSafeHandle instances easier.
-        // In practice, we won't usually see composites from more than two credentials anyway.
-        private CallCredentialsSafeHandle ToNativeRecursive(int startIndex)
-        {
-            if (startIndex == credentials.Count - 1)
-            {
-                return credentials[startIndex].ToNativeCredentials();
-            }
-
-            using (var cred1 = credentials[startIndex].ToNativeCredentials())
-            using (var cred2 = ToNativeRecursive(startIndex + 1))
-            {
-                var nativeComposite = CallCredentialsSafeHandle.CreateComposite(cred1, cred2);
-                if (nativeComposite.IsInvalid)
-                {
-                    throw new ArgumentException("Error creating native composite credentials. Likely, this is because you are trying to compose incompatible credentials.");
-                }
-                return nativeComposite;
-            }
-        }
-    }
 }

src/csharp/Grpc.Core/Internal/CompositeCallCredentials.cs

@@ -0,0 +1,72 @@
+#region Copyright notice and license
+
+// Copyright 2019 The gRPC Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// Credentials that allow composing multiple credentials objects into one <see cref="CallCredentials"/> object.
+    /// </summary>
+    internal sealed class CompositeCallCredentials : CallCredentials
+    {
+        readonly List<CallCredentials> credentials;
+
+        /// <summary>
+        /// Initializes a new instance of <c>CompositeCallCredentials</c> class.
+        /// The resulting credentials object will be composite of all the credentials specified as parameters.
+        /// </summary>
+        /// <param name="credentials">credentials to compose</param>
+        public CompositeCallCredentials(params CallCredentials[] credentials)
+        {
+            GrpcPreconditions.CheckArgument(credentials.Length >= 2, "Composite credentials object can only be created from 2 or more credentials.");
+            this.credentials = new List<CallCredentials>(credentials);
+        }
+
+        internal override CallCredentialsSafeHandle ToNativeCredentials()
+        {
+            return ToNativeRecursive(0);
+        }
+
+        // Recursive descent makes managing lifetime of intermediate CredentialSafeHandle instances easier.
+        // In practice, we won't usually see composites from more than two credentials anyway.
+        private CallCredentialsSafeHandle ToNativeRecursive(int startIndex)
+        {
+            if (startIndex == credentials.Count - 1)
+            {
+                return credentials[startIndex].ToNativeCredentials();
+            }
+
+            using (var cred1 = credentials[startIndex].ToNativeCredentials())
+            using (var cred2 = ToNativeRecursive(startIndex + 1))
+            {
+                var nativeComposite = CallCredentialsSafeHandle.CreateComposite(cred1, cred2);
+                if (nativeComposite.IsInvalid)
+                {
+                    throw new ArgumentException("Error creating native composite credentials. Likely, this is because you are trying to compose incompatible credentials.");
+                }
+                return nativeComposite;
+            }
+        }
+    }
+}

src/csharp/Grpc.Core/Internal/MetadataCredentials.cs

@@ -0,0 +1,51 @@
+#region Copyright notice and license
+
+// Copyright 2019 The gRPC Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core.Internal
+{
+    /// <summary>
+    /// Client-side credentials that delegate metadata based auth to an interceptor.
+    /// The interceptor is automatically invoked for each remote call that uses <c>MetadataCredentials.</c>
+    /// </summary>
+    internal sealed class MetadataCredentials : CallCredentials
+    {
+        readonly AsyncAuthInterceptor interceptor;
+
+        /// <summary>
+        /// Initializes a new instance of <c>MetadataCredentials</c> class.
+        /// </summary>
+        /// <param name="interceptor">authentication interceptor</param>
+        public MetadataCredentials(AsyncAuthInterceptor interceptor)
+        {
+            this.interceptor = GrpcPreconditions.CheckNotNull(interceptor);
+        }
+
+        internal override CallCredentialsSafeHandle ToNativeCredentials()
+        {
+            NativeMetadataCredentialsPlugin plugin = new NativeMetadataCredentialsPlugin(interceptor);
+            return plugin.Credentials;
+        }
+    }
+}