[NotLanded] Implement the fetching algorithm of the Web Manifest.

Source/core/loader/ManifestLoader.cpp

+// 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 "ManifestLoader.h"
+
+#include "core/dom/Document.h"
+#include "core/FetchInitiatorTypeNames.h"
+#include "core/fetch/FetchRequest.h"
+#include "core/fetch/ResourceFetcher.h"
+#include "core/html/HTMLLinkElement.h"
+#include "core/loader/FrameLoaderClient.h"
+#include "platform/network/ResourceRequest.h"
+#include "public/platform/WebManifest.h"
+
+using namespace blink;
+
+void ManifestLoader::loadManifest(PassRefPtr<LocalFrame> frame)
+{
+    // The object will self-destruct when done.
+    ManifestLoader* manifestLoader = new ManifestLoader(frame);
+    manifestLoader->startLoading();
+}
+
+ManifestLoader::ManifestLoader(PassRefPtr<LocalFrame> frame)
+    : m_frame(frame)
+{
+    ASSERT(m_frame);
+}
+
+ManifestLoader::~ManifestLoader()
+{
+}
+
+void ManifestLoader::startLoading()
+{
+    // When deleted, |selfDestruction| will delete |this|.
+    OwnPtr<ManifestLoader> selfDestruction = adoptPtr(this);
+    FrameLoaderClient* client = m_frame->loader().client();

[Nate Chapin, 2014/08/25 20:43:12]

Is this case possible at load start time?

[mlamouri (slow - plz ping), 2014/08/26 17:25:22]

Done.

+    if (!client)
+        return;
+
+    Document* document = m_frame->document();

[Nate Chapin, 2014/08/25 20:43:12]

I don't think this can't be null if there is a non-null FrameLoaderClient.

[mlamouri (slow - plz ping), 2014/08/26 17:25:23]

Done.

+    HTMLLinkElement* linkElement = document ? document->linkManifest() : 0;
+    if (!linkElement) {
+        client->dispatchDidFailLoadManifest(WebManifestError::NoManifest);
+        return;
+    }
+
+    KURL url(document->baseURL(), linkElement->href(), document->encoding());
+    FetchRequest request = FetchRequest(ResourceRequest(url), FetchInitiatorTypeNames::manifest);
+    AtomicString crossOriginMode = linkElement->fastGetAttribute(HTMLNames::crossoriginAttr);
+    if (!crossOriginMode.isNull())
+        request.setCrossOriginAccessControl(document->securityOrigin(), crossOriginMode);
+
+    ResourcePtr<Resource> resource = document->fetcher()->fetchManifest(request);
+    if (!resource) {
+        client->dispatchDidFailLoadManifest(WebManifestError::FetchError);
+        return;
+    }
+
+    setResource(resource);
+    // Prevent |this| from being deleted.
+    ManifestLoader* leakedManifestloader ALLOW_UNUSED = selfDestruction.leakPtr();
+}
+
+void ManifestLoader::notifyFinished(Resource* resource)
+{
+    // When deleted, |selfDestruction| will delete |this|.
+    OwnPtr<ManifestLoader> selfDestruction = adoptPtr(this);
+    ASSERT(resource == this->resource());
+
+    FrameLoaderClient* client = m_frame->loader().client();

[Nate Chapin, 2014/08/25 20:43:12]

I don't think loads can complete when FrameLoaderClient is null, either.

[mlamouri (slow - plz ping), 2014/08/26 17:25:23]

Done.

+    if (!client)
+        return;
+
+    if (resource->loadFailedOrCanceled() || resource->errorOccurred()) {
+        client->dispatchDidFailLoadManifest(WebManifestError::FetchError);
+    } else {
+        // FIXME: parse the received data.
+        WebManifest manifest;
+        client->dispatchDidLoadManifest(manifest);
+    }
+
+    clearResource();
+}