Implement navigator.sendBeacon()

Source/modules/beacon/NavigatorBeacon.cpp

Index: Source/modules/beacon/NavigatorBeacon.cpp
diff --git a/Source/modules/beacon/NavigatorBeacon.cpp b/Source/modules/beacon/NavigatorBeacon.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f19380c6b16bfa73bc10f379f40c5415abd9e382
--- /dev/null
+++ b/Source/modules/beacon/NavigatorBeacon.cpp
@@ -0,0 +1,161 @@
+// Copyright 2014 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.
+
+#include "config.h"
+#include "modules/beacon/NavigatorBeacon.h"
+
+#include "bindings/v8/ExceptionState.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/fileapi/Blob.h"
+#include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
+#include "core/frame/csp/ContentSecurityPolicy.h"
+#include "core/html/DOMFormData.h"
+#include "core/loader/BeaconLoader.h"
+#include "wtf/ArrayBufferView.h"
+
+namespace WebCore {
+
+NavigatorBeacon::NavigatorBeacon(Navigator& navigator)
+    : m_transmittedBytes(0)
+    , m_navigator(navigator)
+{
+}
+
+const char* NavigatorBeacon::supplementName()
+{
+    return "NavigatorBeacon";
+}
+
+NavigatorBeacon& NavigatorBeacon::from(Navigator& navigator)
+{
+    NavigatorBeacon* supplement = static_cast<NavigatorBeacon*>(WillBeHeapSupplement<Navigator>::from(navigator, supplementName()));
+    if (!supplement) {
+        supplement = new NavigatorBeacon(navigator);
+        provideTo(navigator, supplementName(), adoptPtrWillBeNoop(supplement));
+    }
+    return *supplement;
+}
+
+bool NavigatorBeacon::canSendBeacon(ExecutionContext* context, const KURL& url, ExceptionState& exceptionState)
+{
+    if (!url.isValid()) {
+        exceptionState.throwDOMException(SyntaxError, "The URL argument is ill-formed or unsupported.");
+        return false;
+    }
+    // For now, only support HTTP and related.
+    if (!url.protocolIsInHTTPFamily()) {
+        exceptionState.throwDOMException(SyntaxError, "Beacons are only supported over HTTP(S).");
+        return false;
+    }
+    // FIXME: CSP is not enforced on redirects, crbug.com/372197
+    if (!ContentSecurityPolicy::shouldBypassMainWorld(context) && !context->contentSecurityPolicy()->allowConnectToSource(url)) {
+        // We can safely expose the URL to JavaScript, as these checks happen synchronously before redirection. JavaScript receives no new information.
+        exceptionState.throwSecurityError("Refused to send beacon to '" + url.elidedString() + "' because it violates the document's Content Security Policy.");
+        return false;
+    }
+
+    // Do not allow sending Beacons over a Navigator that is detached.
+    if (!m_navigator.frame())
+        return false;
+
+    return true;
+}
+
+int NavigatorBeacon::maxAllowance() const
+{
+    const Settings* settings = m_navigator.frame()->settings();
+    if (settings) {
+        int maxAllowed = settings->maxBeaconTransmission();
+        if (maxAllowed < m_transmittedBytes)
+            return 0;
+        return maxAllowed - m_transmittedBytes;
+    }
+    return m_transmittedBytes;
+}
+
+void NavigatorBeacon::updateTransmittedBytes(int length)
+{
+    ASSERT(length >= 0);
+    m_transmittedBytes += length;
+}
+
+bool NavigatorBeacon::sendBeacon(ExecutionContext* context, Navigator& navigator, const String& urlstring, const String& data, ExceptionState& exceptionState)
+{
+    return NavigatorBeacon::from(navigator).sendBeacon(context, urlstring, data, exceptionState);
+}
+
+bool NavigatorBeacon::sendBeacon(ExecutionContext* context, const String& urlstring, const String& data, ExceptionState& exceptionState)
+{
+    KURL url = context->completeURL(urlstring);
+    if (!canSendBeacon(context, url, exceptionState))
+        return false;
+
+    int bytes = 0;
+    bool result = BeaconLoader::sendBeacon(m_navigator.frame(), maxAllowance(), url, data, bytes);
+    if (result)
+        updateTransmittedBytes(bytes);
+
+    return result;
+}
+
+bool NavigatorBeacon::sendBeacon(ExecutionContext* context, Navigator& navigator, const String& urlstring, PassRefPtr<ArrayBufferView> data, ExceptionState& exceptionState)
+{
+    return NavigatorBeacon::from(navigator).sendBeacon(context, urlstring, data, exceptionState);
+}
+
+bool NavigatorBeacon::sendBeacon(ExecutionContext* context, const String& urlstring, PassRefPtr<ArrayBufferView> data, ExceptionState& exceptionState)
+{
+    KURL url = context->completeURL(urlstring);
+    if (!canSendBeacon(context, url, exceptionState))
+        return false;
+
+    int bytes = 0;
+    bool result = BeaconLoader::sendBeacon(m_navigator.frame(), maxAllowance(), url, data, bytes);
+    if (result)
+        updateTransmittedBytes(bytes);
+
+    return result;
+}
+
+bool NavigatorBeacon::sendBeacon(ExecutionContext* context, Navigator& navigator, const String& urlstring, PassRefPtrWillBeRawPtr<Blob> data, ExceptionState& exceptionState)
+{
+    return NavigatorBeacon::from(navigator).sendBeacon(context, urlstring, data, exceptionState);
+}
+
+bool NavigatorBeacon::sendBeacon(ExecutionContext* context, const String& urlstring, PassRefPtrWillBeRawPtr<Blob> data, ExceptionState& exceptionState)
+{
+    KURL url = context->completeURL(urlstring);
+    if (!canSendBeacon(context, url, exceptionState))
+        return false;
+
+    int bytes = 0;
+    bool result = BeaconLoader::sendBeacon(m_navigator.frame(), maxAllowance(), url, data, bytes);
+    if (result)
+        updateTransmittedBytes(bytes);
+
+    return result;
+}
+
+bool NavigatorBeacon::sendBeacon(ExecutionContext* context, Navigator& navigator, const String& urlstring, PassRefPtrWillBeRawPtr<DOMFormData> data, ExceptionState& exceptionState)
+{
+    return NavigatorBeacon::from(navigator).sendBeacon(context, urlstring, data, exceptionState);
+}
+
+bool NavigatorBeacon::sendBeacon(ExecutionContext* context, const String& urlstring, PassRefPtrWillBeRawPtr<DOMFormData> data, ExceptionState& exceptionState)
+{
+    KURL url = context->completeURL(urlstring);
+    if (!canSendBeacon(context, url, exceptionState))
+        return false;
+
+    int bytes = 0;
+    bool result = BeaconLoader::sendBeacon(m_navigator.frame(), maxAllowance(), url, data, bytes);
+    if (result)
+        updateTransmittedBytes(bytes);
+
+    return result;
+}
+
+} // namespace WebCore