[Payment Request] Error message screen

ios/chrome/browser/payments/payment_request_manager.mm

Index: ios/chrome/browser/payments/payment_request_manager.mm
diff --git a/ios/chrome/browser/payments/payment_request_manager.mm b/ios/chrome/browser/payments/payment_request_manager.mm
index f4cbdc022fec5cc0d939a4ba67268069b53365c8..01f0a999b1c364551d611a18849799d3ab808ff0 100644
--- a/ios/chrome/browser/payments/payment_request_manager.mm
+++ b/ios/chrome/browser/payments/payment_request_manager.mm
@@ -86,9 +86,13 @@ const NSTimeInterval kTimeoutInterval = 60.0;
   // Timer used to periodically unblock the webview's JS event queue.
   base::scoped_nsobject<NSTimer> _unblockEventQueueTimer;
 
-  // Timer used to close the UI if the page does not call
-  // PaymentResponse.complete() in a timely fashion.
+  // Timer used to complete the Payment Request flow and close the UI if the
+  // page does not call PaymentResponse.complete() in a timely fashion.
   base::scoped_nsobject<NSTimer> _paymentResponseTimeoutTimer;
+
+  // Timer used to cancel the Payment Request flow and close the UI if the
+  // page does not call settle the pending update promise in a timely fashion.
+  base::scoped_nsobject<NSTimer> _updateEventTimeoutTimer;
 }
 
 // Synchronous method executed by -asynchronouslyEnablePaymentRequest:
@@ -105,9 +109,14 @@ const NSTimeInterval kTimeoutInterval = 60.0;
 // invocation was successful.
 - (BOOL)handleRequestShow:(const base::DictionaryValue&)message;
 
+// Called by |_paymentResponseTimeoutTimer|, invokes handleResponseComplete:
+// as if PaymentResponse.complete() was invoked with the default "unknown"
+// argument.
+- (BOOL)handleResponseComplete;
+
 // Handles invocations of PaymentResponse.complete(). Returns YES if the
 // invocation was successful.
-- (BOOL)handleResponseComplete;
+- (BOOL)handleResponseComplete:(const base::DictionaryValue&)message;
 
 // Handles invocations of PaymentRequestUpdateEvent.updateWith(). Returns YES if
 // the invocation was successful.
@@ -124,6 +133,13 @@ const NSTimeInterval kTimeoutInterval = 60.0;
 // called with no arguments.
 - (void)setPaymentResponseTimeoutTimer;
 
+// Establishes a timer that dismisses the Payment Request UI when it times out.
+// Per the spec, implementations may choose to consider a timeout for the
+// promise provided with the PaymentRequestUpdateEvent.updateWith() call. If the
+// promise doesn't get settled in a reasonable amount of time, it is as if it
+// was rejected.
+- (void)setUpdateEventTimeoutTimer;
+
 @end
 
 @implementation PaymentRequestManager
@@ -275,7 +291,7 @@ const NSTimeInterval kTimeoutInterval = 60.0;
     return [self handleRequestCancel];
   }
   if (command == "paymentRequest.responseComplete") {
-    return [self handleResponseComplete];
+    return [self handleResponseComplete:JSONCommand];
   }
   if (command == "paymentRequest.updatePaymentDetails") {
     return [self handleUpdatePaymentDetails:JSONCommand];
@@ -334,22 +350,53 @@ const NSTimeInterval kTimeoutInterval = 60.0;
 
   [_unblockEventQueueTimer invalidate];
   [_paymentResponseTimeoutTimer invalidate];
+  [_updateEventTimeoutTimer invalidate];
+
+  base::WeakNSObject<PaymentRequestManager> weakSelf(self);
+  void (^callback)() = ^{
+    base::scoped_nsobject<PaymentRequestManager> strongSelf([weakSelf retain]);
+    [strongSelf cancelRequestWithErrorMessage:@"Request canceled."];
+  };
 
-  [self cancelRequestWithErrorMessage:@"Request canceled by the page."];
+  [_paymentRequestCoordinator displayErrorWithCallback:callback];
 
   return YES;
 }
 
 - (BOOL)handleResponseComplete {
+  base::DictionaryValue command;
+  command.SetString("result", "unknown");
+  return [self handleResponseComplete:command];
+}
+
+- (BOOL)handleResponseComplete:(const base::DictionaryValue&)message {
   // TODO(crbug.com/602666): Check that there *is* a pending response here.
-  // TODO(crbug.com/602666): Indicate success or failure in the UI.
 
   [_unblockEventQueueTimer invalidate];
   [_paymentResponseTimeoutTimer invalidate];
+  [_updateEventTimeoutTimer invalidate];
 
-  [self dismissUI];
+  [_unblockEventQueueTimer invalidate];
+
+  std::string result;
+  if (!message.GetString("result", &result)) {
+    DLOG(ERROR) << "JS message parameter 'result' is missing";
+    return NO;
+  }
 
-  [_paymentRequestJsManager resolveResponsePromiseWithCompletionHandler:nil];
+  base::WeakNSObject<PaymentRequestManager> weakSelf(self);
+  void (^callback)() = ^{
+    base::scoped_nsobject<PaymentRequestManager> strongSelf([weakSelf retain]);
+    [strongSelf dismissUI];
+    [_paymentRequestJsManager resolveResponsePromiseWithCompletionHandler:nil];
+  };
+
+  // Display UI indicating failure if the value of |result| is "fail".
+  if (result == "fail") {
+    [_paymentRequestCoordinator displayErrorWithCallback:callback];
+  } else {
+    callback();
+  }
 
   return YES;
 }
@@ -393,6 +440,15 @@ const NSTimeInterval kTimeoutInterval = 60.0;
                                        repeats:NO] retain]);
 }
 
+- (void)setUpdateEventTimeoutTimer {
+  _updateEventTimeoutTimer.reset(
+      [[NSTimer scheduledTimerWithTimeInterval:kTimeoutInterval
+                                        target:self
+                                      selector:@selector(handleRequestCancel)
+                                      userInfo:nil
+                                       repeats:NO] retain]);
+}
+
 - (void)dismissUI {
   [_paymentRequestCoordinator stop];
   _paymentRequestCoordinator.reset();
@@ -419,7 +475,7 @@ const NSTimeInterval kTimeoutInterval = 60.0;
 
 - (void)paymentRequestCoordinatorDidCancel:
     (PaymentRequestCoordinator*)coordinator {
-  [self cancelRequestWithErrorMessage:@"Request canceled by user."];
+  [self cancelRequestWithErrorMessage:@"Request canceled."];
 }
 
 - (void)paymentRequestCoordinator:(PaymentRequestCoordinator*)coordinator
@@ -436,6 +492,7 @@ const NSTimeInterval kTimeoutInterval = 60.0;
   [_paymentRequestJsManager updateShippingAddress:shippingAddress
                                 completionHandler:nil];
   [self setUnblockEventQueueTimer];
+  [self setUpdateEventTimeoutTimer];
 }
 
 - (void)paymentRequestCoordinator:(PaymentRequestCoordinator*)coordinator
@@ -443,6 +500,7 @@ const NSTimeInterval kTimeoutInterval = 60.0;
   [_paymentRequestJsManager updateShippingOption:shippingOption
                                completionHandler:nil];
   [self setUnblockEventQueueTimer];
+  [self setUpdateEventTimeoutTimer];
 }
 
 #pragma mark - CRWWebStateObserver methods