[Payments] Implement openWindow for service worker based payment handler

third_party/WebKit/Source/modules/payments/PaymentRequestEvent.cpp

Index: third_party/WebKit/Source/modules/payments/PaymentRequestEvent.cpp
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequestEvent.cpp b/third_party/WebKit/Source/modules/payments/PaymentRequestEvent.cpp
index 748de28bfa536339d42abb6323929f6bd6341052..6627c49adbdc248234b31b1e7ee6fb2e5e319ab4 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequestEvent.cpp
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequestEvent.cpp
@@ -4,7 +4,14 @@
 
 #include "modules/payments/PaymentRequestEvent.h"
 
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "core/dom/DOMException.h"
+#include "core/workers/WorkerGlobalScope.h"
+#include "core/workers/WorkerLocation.h"
 #include "modules/serviceworkers/RespondWithObserver.h"
+#include "modules/serviceworkers/ServiceWorkerGlobalScopeClient.h"
+#include "modules/serviceworkers/ServiceWorkerWindowClientCallback.h"
+#include "platform/wtf/PtrUtil.h"
 #include "platform/wtf/text/AtomicString.h"
 
 namespace blink {
@@ -53,6 +60,47 @@ const String& PaymentRequestEvent::instrumentKey() const {
   return instrument_key_;
 }
 
+ScriptPromise PaymentRequestEvent::openWindow(ScriptState* script_state,
+                                              const String& url) {
+  ScriptPromiseResolver* resolver = ScriptPromiseResolver::Create(script_state);
+  ScriptPromise promise = resolver->Promise();
+  ExecutionContext* context = ExecutionContext::From(script_state);
+
+  // TODO(gogerald): Check payment request state so as to reject promise with
+  // "InvalidStateError" appropriately (refer
+  // https://w3c.github.io/payment-handler/#dfn-open-window-algorithm).
+
+  KURL parsed_url_to_open = context->CompleteURL(url);
+  if (!parsed_url_to_open.IsValid()) {
+    resolver->Reject(V8ThrowException::CreateTypeError(
+        script_state->GetIsolate(), "'" + url + "' is not a valid URL."));
+    return promise;
+  }
+
+  // TODO(gogerald): Once the issue of the spec is resolved, we should apply the
+  // changes. Refer https://github.com/w3c/payment-handler/issues/168.
+  if (!context->GetSecurityOrigin()->IsSameSchemeHostPortAndSuborigin(
+          SecurityOrigin::Create(parsed_url_to_open).Get())) {
+    resolver->Reject(DOMException::Create(
+        kSecurityError,
+        "'" + parsed_url_to_open.ElidedString() + "' is not allowed."));
+    return promise;
+  }
+
+  // TODO(gogerald): Once the issue of the spec is resolved, we should apply the
+  // changes. Refer https://github.com/w3c/payment-handler/issues/169.
+  if (!context->IsWindowInteractionAllowed()) {
+    resolver->Reject(DOMException::Create(kInvalidAccessError,
+                                          "Not allowed to open a window."));
+    return promise;
+  }
+  context->ConsumeWindowInteraction();
+
+  ServiceWorkerGlobalScopeClient::From(context)->OpenWindowForPaymentHandler(
+      parsed_url_to_open, WTF::MakeUnique<NavigateClientCallback>(resolver));
+  return promise;
+}
+
 void PaymentRequestEvent::respondWith(ScriptState* script_state,
                                       ScriptPromise script_promise,
                                       ExceptionState& exception_state) {