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diff --git a/java/com/google/gerrit/server/git/validators/UploadValidationListener.java b/java/com/google/gerrit/server/git/validators/UploadValidationListener.java
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+++ b/java/com/google/gerrit/server/git/validators/UploadValidationListener.java
@@ -0,0 +1,81 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// 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.
+
+package com.google.gerrit.server.git.validators;
+
+import com.google.gerrit.extensions.annotations.ExtensionPoint;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.server.validators.ValidationException;
+import java.util.Collection;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.transport.UploadPack;
+
+/**
+ * Listener to provide validation for upload operations.
+ *
+ * <p>Invoked by Gerrit before it begins to send a pack to the client.
+ *
+ * <p>Implementors can block the upload operation by throwing a ValidationException. The exception's
+ * message text will be reported to the end-user over the client's protocol connection.
+ */
+@ExtensionPoint
+public interface UploadValidationListener {
+
+  /**
+   * Validate an upload before it begins.
+   *
+   * @param repository The repository
+   * @param project The project
+   * @param remoteHost Remote address/hostname of the user
+   * @param up the UploadPack instance being processed.
+   * @param wants The list of wanted objects. These may be RevObject or RevCommit if the processor
+   *     parsed them. Implementors should not rely on the values being parsed.
+   * @param haves The list of common objects. Empty on an initial clone request. These may be
+   *     RevObject or RevCommit if the processor parsed them. Implementors should not rely on the
+   *     values being parsed.
+   * @throws ValidationException to block the upload and send a message back to the end-user over
+   *     the client's protocol connection.
+   */
+  default void onPreUpload(
+      Repository repository,
+      Project project,
+      String remoteHost,
+      UploadPack up,
+      Collection<? extends ObjectId> wants,
+      Collection<? extends ObjectId> haves)
+      throws ValidationException {}
+
+  /**
+   * Invoked before negotiation round is started.
+   *
+   * @param repository The repository
+   * @param project The project
+   * @param remoteHost Remote address/hostname of the user
+   * @param up the UploadPack instance being processed
+   * @param wants The list of wanted objects. These may be RevObject or RevCommit if the processor
+   *     parsed them. Implementors should not rely on the values being parsed.
+   * @param cntOffered number of objects the client has offered.
+   * @throws ValidationException to block the upload and send a message back to the end-user over
+   *     the client's protocol connection.
+   */
+  default void onBeginNegotiate(
+      Repository repository,
+      Project project,
+      String remoteHost,
+      UploadPack up,
+      Collection<? extends ObjectId> wants,
+      int cntOffered)
+      throws ValidationException {}
+}