Implement File constructor.

Source/bindings/v8/custom/V8FileCustom.cpp

+/*
+ * Copyright (C) 2013 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
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * 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 "V8File.h"
+
+#include "RuntimeEnabledFeatures.h"
+#include "bindings/v8/custom/V8BlobCustomHelpers.h"
+#include "core/fileapi/BlobBuilder.h"
+#include "wtf/RefPtr.h"

[haraken, 2013/11/15 08:40:05]

Nit: This won't be needed.

[pwnall-personal, 2013/11/15 10:28:53]

Done.

+
+namespace WebCore {
+
+void V8File::constructorCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
+{
+    if (!RuntimeEnabledFeatures::fileConstructorEnabled()) {
+        throwTypeError("Illegal constructor", info.GetIsolate());
+        return;
+    }
+
+    if (info.Length() < 2) {
+        throwTypeError("File constructor requires at least two arguments", info.GetIsolate());
+        return;
+    }
+
+    uint32_t length = 0;
+    if (info[0]->IsArray()) {
+        length = v8::Local<v8::Array>::Cast(info[0])->Length();
+    } else {
+        const int sequenceArgumentIndex = 0;
+        if (toV8Sequence(info[sequenceArgumentIndex], length, info.GetIsolate()).IsEmpty()) {

[haraken, 2013/11/15 08:40:05]

I wonder toV8Sequence will always return false because you're calling
toV8Sequence for info[0] which is not an Array.

[pwnall-personal, 2013/11/15 10:28:53]

This works the same as in the Blob constructor. WebIDL sequences are a superset
of arrays.

FWIW, this code path is covered by some of the tests towards the bottom of
LayoutTests/fast/files/{blob,file}-constructor.html.

+            throwTypeError(ExceptionMessages::failedToConstruct("File", ExceptionMessages::notAnArrayTypeArgumentOrValue(sequenceArgumentIndex + 1)), info.GetIsolate());
+            return;
+        }
+    }
+
+    V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID(V8StringResource<>, fileName, info[1]);
+
+    String contentType;
+    String endings = "transparent";

[haraken, 2013/11/15 08:40:05]

Nit: You can set |endings| in processBlobPropertyBag().

[pwnall-personal, 2013/11/15 10:28:53]

This has the same issue as in V8BlobCustom. I'll follow your guidance for both
files.

+
+    if (info.Length() > 2) {
+        if (!info[2]->IsObject()) {
+            throwTypeError(ExceptionMessages::failedToConstruct("File", "The 3rd argument is not of type Object."), info.GetIsolate());
+            return;
+        }
+
+        if (!V8BlobCustomHelpers::processBlobPropertyBag(info[2], info.GetIsolate(), "File", contentType, endings))
+            return;
+    }
+    ASSERT(endings == "transparent" || endings == "native");
+
+    BlobBuilder blobBuilder;
+    v8::Local<v8::Object> blobParts = v8::Local<v8::Object>::Cast(info[0]);
+    if (!V8BlobCustomHelpers::processBlobParts(blobParts, length, info.GetIsolate(), endings, blobBuilder))
+        return;
+
+    RefPtr<File> file = blobBuilder.createFile(contentType, fileName, currentTime());
+    info.GetReturnValue().Set(toV8(file.get(), info.Holder(), info.GetIsolate()));

[haraken, 2013/11/15 08:40:05]

Use v8SetReturnValue().

[pwnall-personal, 2013/11/15 10:28:53]

Done.

+}
+
+} // namespace WebCore