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diff --git a/Firestore/Source/Auth/FSTUser.mm b/Firestore/Source/Auth/FSTUser.mm
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+++ b/Firestore/Source/Auth/FSTUser.mm
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+/*
+ * Copyright 2017 Google
+ *
+ * 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.
+ */
+
+#import "Firestore/Source/Auth/FSTUser.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+#pragma mark - FSTUser
+
+@implementation FSTUser
+
+@dynamic unauthenticated;
+
++ (instancetype)unauthenticatedUser {
+  return [[FSTUser alloc] initWithUID:nil];
+}
+
+- (instancetype)initWithUID:(NSString *_Nullable)UID {
+  if (self = [super init]) {
+    _UID = UID;
+  }
+  return self;
+}
+
+- (BOOL)isEqual:(id)object {
+  if (self == object) {
+    return YES;
+  } else if (![object isKindOfClass:[FSTUser class]]) {
+    return NO;
+  } else {
+    FSTUser *other = object;
+    return (self.isUnauthenticated && other.isUnauthenticated) ||
+           [self.UID isEqualToString:other.UID];
+  }
+}
+
+- (NSUInteger)hash {
+  return [self.UID hash];
+}
+
+- (id)copyWithZone:(nullable NSZone *)zone {
+  return self;  // since FSTUser objects are immutable
+}
+
+- (NSString *)description {
+  return [NSString stringWithFormat:@"<FSTUser uid=%@>", self.UID];
+}
+
+- (BOOL)isUnauthenticated {
+  return self.UID == nil;
+}
+
+@end
+
+NS_ASSUME_NONNULL_END