Implement the logic to find the correct <link> for Manifest in Document.

Source/core/dom/DocumentTest.cpp

 /*
  * Copyright (c) 2014, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/Document.h"
 
+#include "core/html/HTMLHeadElement.h"
+#include "core/html/HTMLLinkElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
 using namespace WebCore;
 
 namespace {
 
 class DocumentTest : public ::testing::Test {
 protected:
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         ::testing::Mock::VerifyAndClearExpectations(observer1.get());
         ::testing::Mock::VerifyAndClearExpectations(observer2.get());
     }
 
     // observer2 destroyed
     EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateHidden)).Times(0);
     EXPECT_CALL(*observer1, didChangeVisibilityState(PageVisibilityStateVisible)).Times(1);
     page().setVisibilityState(PageVisibilityStateVisible, false);
 }
 
+// This test checks that Documunt::linkManifest() returns a value conform to the specification.
+TEST_F(DocumentTest, LinkManifest)
+{
+    // Test the default result.
+    EXPECT_EQ(0, document().linkManifest());
+
+    // Check that we use the first manifest with <link rel=manifest>
+    RefPtrWillBeRawPtr<HTMLLinkElement> link = HTMLLinkElement::create(document(), false);
+    link->setAttribute(WebCore::HTMLNames::relAttr, "manifest");
+    link->setAttribute(WebCore::HTMLNames::hrefAttr, "foo.json");
+    document().head()->appendChild(link);
+    EXPECT_EQ(link, document().linkManifest());
+
+    RefPtrWillBeRawPtr<HTMLLinkElement> link2 = HTMLLinkElement::create(document(), false);
+    link2->setAttribute(WebCore::HTMLNames::relAttr, "manifest");
+    link2->setAttribute(WebCore::HTMLNames::hrefAttr, "bar.json");
+    document().head()->insertBefore(link2, link.get());
+    EXPECT_EQ(link2, document().linkManifest());
+    document().head()->appendChild(link2);
+    EXPECT_EQ(link, document().linkManifest());
+
+    // Check that crazy URLs are accepted.
+    link->setAttribute(WebCore::HTMLNames::hrefAttr, "http:foo.json");
+    EXPECT_EQ(link, document().linkManifest());
+
+    // Check that empty URLs are accepted.
+    link->setAttribute(WebCore::HTMLNames::hrefAttr, "");
+    EXPECT_EQ(link, document().linkManifest());
+
+    // Check that URLs from different origins are accepted.
+    link->setAttribute(WebCore::HTMLNames::hrefAttr, "http://example.org/manifest.json");
+    EXPECT_EQ(link, document().linkManifest());
+    link->setAttribute(WebCore::HTMLNames::hrefAttr, "http://foo.example.org/manifest.json");
+    EXPECT_EQ(link, document().linkManifest());
+    link->setAttribute(WebCore::HTMLNames::hrefAttr, "http://foo.bar/manifest.json");
+    EXPECT_EQ(link, document().linkManifest());
+
+    // More than one token in @rel is accepted.
+    link->setAttribute(WebCore::HTMLNames::relAttr, "foo bar manifest");
+    EXPECT_EQ(link, document().linkManifest());
+
+    // Such as spaces around the token.
+    link->setAttribute(WebCore::HTMLNames::relAttr, " manifest ");
+    EXPECT_EQ(link, document().linkManifest());
+
+    // Check that rel=manifest actually matters.
+    link->setAttribute(WebCore::HTMLNames::relAttr, "");
+    EXPECT_EQ(link2, document().linkManifest());
+    link->setAttribute(WebCore::HTMLNames::relAttr, "manifest");
+
+    // Check that link outside of the <head> are ignored.
+    document().head()->removeChild(link.get(), ASSERT_NO_EXCEPTION);
+    document().head()->removeChild(link2.get(), ASSERT_NO_EXCEPTION);
+    EXPECT_EQ(0, document().linkManifest());
+    document().body()->appendChild(link);
+    EXPECT_EQ(0, document().linkManifest());
+    document().head()->appendChild(link);
+    document().head()->appendChild(link2);
+
+    // Check that some attribute values do not have an effect.
+    link->setAttribute(WebCore::HTMLNames::crossoriginAttr, "use-credentials");
+    EXPECT_EQ(link, document().linkManifest());
+    link->setAttribute(WebCore::HTMLNames::hreflangAttr, "klingon");
+    EXPECT_EQ(link, document().linkManifest());
+    link->setAttribute(WebCore::HTMLNames::typeAttr, "image/gif");
+    EXPECT_EQ(link, document().linkManifest());
+    link->setAttribute(WebCore::HTMLNames::sizesAttr, "16x16");
+    EXPECT_EQ(link, document().linkManifest());
+    link->setAttribute(WebCore::HTMLNames::mediaAttr, "print");
+    EXPECT_EQ(link, document().linkManifest());
+}
+
 } // unnamed namespace