Upstream Chrome on iOS source code [2/11].

ios/chrome/browser/payments/js_payment_request_manager.mm

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/chrome/browser/payments/js_payment_request_manager.h"
+
+#include "base/json/json_writer.h"
+#include "base/json/string_escape.h"
+#include "base/logging.h"
+#include "base/strings/sys_string_conversions.h"
+#include "base/values.h"
+#include "ios/web/public/payments/payment_request.h"
+
+namespace {
+
+// Sanitizes |JSON| and wraps it in quotes so it can be injected safely in
+// JavaScript.
+NSString* JSONEscape(NSString* JSON) {
+  return base::SysUTF8ToNSString(
+      base::GetQuotedJSONString(base::SysNSStringToUTF8(JSON)));
+}
+
+}  // namespace
+
+@interface JSPaymentRequestManager ()
+
+// Executes the JavaScript in |script| and passes a BOOL to |completionHandler|
+// indicating whether an error occurred. The resolve and reject functions in the
+// Payment Request JavaScript do not return values so the result is ignored.
+- (void)executeScript:(NSString*)script
+    completionHandler:(void (^)(BOOL))completionHandler;
+
+@end
+
+@implementation JSPaymentRequestManager
+
+- (void)resolveRequestPromise:(const web::PaymentResponse&)paymentResponse
+            completionHandler:(void (^)(BOOL))completionHandler {
+  std::unique_ptr<base::DictionaryValue> paymentResponseData =
+      paymentResponse.ToDictionaryValue();
+  std::string paymentResponseDataJSON;
+  base::JSONWriter::Write(*paymentResponseData, &paymentResponseDataJSON);
+  NSString* script = [NSString
+      stringWithFormat:
+          @"__gCrWeb['paymentRequestManager'].pendingRequest.resolve(%@)",
+          base::SysUTF8ToNSString(paymentResponseDataJSON)];
+  [self executeScript:script completionHandler:completionHandler];
+}
+
+- (void)rejectRequestPromise:(NSString*)errorMessage
+           completionHandler:(void (^)(BOOL))completionHandler {
+  NSString* script = [NSString
+      stringWithFormat:
+          @"__gCrWeb['paymentRequestManager'].pendingRequest.reject(%@)",
+          JSONEscape(errorMessage)];
+  [self executeScript:script completionHandler:completionHandler];
+}
+
+- (void)resolveResponsePromise:(void (^)(BOOL))completionHandler {
+  NSString* script =
+      @"__gCrWeb['paymentRequestManager'].pendingResponse.resolve()";
+  [self executeScript:script completionHandler:completionHandler];
+}
+
+- (void)rejectResponsePromise:(NSString*)errorMessage
+            completionHandler:(void (^)(BOOL))completionHandler {
+  NSString* script = [NSString
+      stringWithFormat:
+          @"__gCrWeb['paymentRequestManager'].pendingResponse.reject(%@)",
+          JSONEscape(errorMessage)];
+  [self executeScript:script completionHandler:completionHandler];
+}
+
+- (void)executeScript:(NSString*)script
+    completionHandler:(void (^)(BOOL))completionHandler {
+  [self executeJavaScript:script
+        completionHandler:^(id result, NSError* error) {
+          if (completionHandler)
+            completionHandler(!error);
+        }];
+}
+
+#pragma mark - Protected methods
+
+- (NSString*)scriptPath {
+  return @"payment_request_manager";
+}
+
+- (NSString*)presenceBeacon {
+  return @"__gCrWeb.paymentRequestManager";
+}
+
+@end