Revert "Revert "Add OAuth2 protocol in GRPCClient""
diff --git a/src/objective-c/GRPCClient/GRPCCall.m b/src/objective-c/GRPCClient/GRPCCall.m
index 8723624..436c19e 100644
--- a/src/objective-c/GRPCClient/GRPCCall.m
+++ b/src/objective-c/GRPCClient/GRPCCall.m
@@ -18,6 +18,8 @@
 
 #import "GRPCCall.h"
 
+#import "GRPCCall+OAuth2.h"
+
 #include <grpc/grpc.h>
 #include <grpc/support/time.h>
 #import <RxLibrary/GRXConcurrentWriteable.h>
@@ -40,10 +42,14 @@
 NSString * const kGRPCTrailersKey = @"io.grpc.TrailersKey";
 static NSMutableDictionary *callFlags;
 
+static NSString * const kAuthorizationHeader = @"authorization";
+static NSString * const kBearerPrefix = @"Bearer ";
+
 @interface GRPCCall () <GRXWriteable>
 // Make them read-write.
 @property(atomic, strong) NSDictionary *responseHeaders;
 @property(atomic, strong) NSDictionary *responseTrailers;
+@property(atomic) BOOL isWaitingForToken;
 @end
 
 // The following methods of a C gRPC call object aren't reentrant, and thus
@@ -181,9 +187,6 @@
 
 - (void)finishWithError:(NSError *)errorOrNil {
   @synchronized(self) {
-    if (_state == GRXWriterStateFinished) {
-      return;
-    }
     _state = GRXWriterStateFinished;
   }
 
@@ -211,7 +214,11 @@
   [self finishWithError:[NSError errorWithDomain:kGRPCErrorDomain
                                             code:GRPCErrorCodeCancelled
                                         userInfo:@{NSLocalizedDescriptionKey: @"Canceled by app"}]];
-  [self cancelCall];
+  if (!self.isWaitingForToken) {
+    [self cancelCall];
+  } else {
+    self.isWaitingForToken = NO;
+  }
 }
 
 - (void)dealloc {
@@ -410,6 +417,36 @@
 
 #pragma mark GRXWriter implementation
 
+- (void)startCallWithWriteable:(id<GRXWriteable>)writeable {
+  _responseWriteable = [[GRXConcurrentWriteable alloc] initWithWriteable:writeable
+                                                           dispatchQueue:_responseQueue];
+
+  _wrappedCall = [[GRPCWrappedCall alloc] initWithHost:_host
+                                            serverName:_serverName
+                                                  path:_path];
+  NSAssert(_wrappedCall, @"Error allocating RPC objects. Low memory?");
+
+  [self sendHeaders:_requestHeaders];
+  [self invokeCall];
+
+  // TODO(jcanizales): Extract this logic somewhere common.
+  NSString *host = [NSURL URLWithString:[@"https://" stringByAppendingString:_host]].host;
+  if (!host) {
+    // TODO(jcanizales): Check this on init.
+    [NSException raise:NSInvalidArgumentException format:@"host of %@ is nil", _host];
+  }
+  _connectivityMonitor = [GRPCConnectivityMonitor monitorWithHost:host];
+  __weak typeof(self) weakSelf = self;
+  void (^handler)() = ^{
+    typeof(self) strongSelf = weakSelf;
+    [strongSelf finishWithError:[NSError errorWithDomain:kGRPCErrorDomain
+                                                    code:GRPCErrorCodeUnavailable
+                                                userInfo:@{ NSLocalizedDescriptionKey : @"Connectivity lost." }]];
+  };
+  [_connectivityMonitor handleLossWithHandler:handler
+                      wifiStatusChangeHandler:nil];
+}
+
 - (void)startWithWriteable:(id<GRXWriteable>)writeable {
   @synchronized(self) {
     _state = GRXWriterStateStarted;
@@ -422,33 +459,23 @@
   // that the life of the instance is determined by this retain cycle.
   _retainSelf = self;
 
-  _responseWriteable = [[GRXConcurrentWriteable alloc] initWithWriteable:writeable
-                                                           dispatchQueue:_responseQueue];
-
-  _wrappedCall = [[GRPCWrappedCall alloc] initWithHost:_host serverName:_serverName path:_path];
-  NSAssert(_wrappedCall, @"Error allocating RPC objects. Low memory?");
-
-  [self sendHeaders:_requestHeaders];
-  [self invokeCall];
-
-  // TODO(jcanizales): Extract this logic somewhere common.
-  NSString *host = [NSURL URLWithString:[@"https://" stringByAppendingString:_host]].host;
-  if (!host) {
-    // TODO(jcanizales): Check this on init.
-    [NSException raise:NSInvalidArgumentException format:@"host of %@ is nil", _host];
+  if (self.tokenProvider != nil) {
+    self.isWaitingForToken = YES;
+    __weak typeof(self) weakSelf = self;
+    [self.tokenProvider getTokenWithHandler:^(NSString *token){
+      typeof(self) strongSelf = weakSelf;
+      if (strongSelf && strongSelf.isWaitingForToken) {
+        if (token) {
+          NSString *t = [kBearerPrefix stringByAppendingString:token];
+          strongSelf.requestHeaders[kAuthorizationHeader] = t;
+        }
+        [strongSelf startCallWithWriteable:writeable];
+        strongSelf.isWaitingForToken = NO;
+      }
+    }];
+  } else {
+    [self startCallWithWriteable:writeable];
   }
-  __weak typeof(self) weakSelf = self;
-  _connectivityMonitor = [GRPCConnectivityMonitor monitorWithHost:host];
-  void (^handler)() = ^{
-    typeof(self) strongSelf = weakSelf;
-    if (strongSelf) {
-      [strongSelf finishWithError:[NSError errorWithDomain:kGRPCErrorDomain
-                                                      code:GRPCErrorCodeUnavailable
-                                                  userInfo:@{ NSLocalizedDescriptionKey : @"Connectivity lost." }]];
-    }
-  };
-  [_connectivityMonitor handleLossWithHandler:handler
-                      wifiStatusChangeHandler:nil];
 }
 
 - (void)setState:(GRXWriterState)newState {