[3/3 blink] Support redirect option of Request and "opaqueredirect" response type.

Source/modules/fetch/FetchManager.cpp

Index: Source/modules/fetch/FetchManager.cpp
diff --git a/Source/modules/fetch/FetchManager.cpp b/Source/modules/fetch/FetchManager.cpp
index 989297dbe59509b104bd2b9edd2ab7dba3c3915e..564544c7aac9f889fdaba30ff90450e20764d2c1 100644
--- a/Source/modules/fetch/FetchManager.cpp
+++ b/Source/modules/fetch/FetchManager.cpp
@@ -37,15 +37,6 @@
 
 namespace blink {
 
-namespace {
-
-bool IsRedirectStatusCode(int statusCode)
-{
-    return (statusCode == 301 || statusCode == 302 || statusCode == 303 || statusCode == 307 || statusCode == 308);
-}
-
-} // namespace
-
 class FetchManager::Loader final : public NoBaseWillBeGarbageCollectedFinalized<FetchManager::Loader>, public ThreadableLoaderClient, public ContextLifecycleObserver {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(FetchManager::Loader);
 public:
@@ -111,8 +102,6 @@ DEFINE_TRACE(FetchManager::Loader)
 
 void FetchManager::Loader::didReceiveResponse(unsigned long, const ResourceResponse& response, PassOwnPtr<WebDataConsumerHandle> handle)
 {
-    ASSERT(handle);
-
     m_responseHttpStatusCode = response.httpStatusCode();
 
     // Recompute the tainting if the request was redirected to a different
@@ -131,7 +120,17 @@ void FetchManager::Loader::didReceiveResponse(unsigned long, const ResourceRespo
             break;
         }
     }
-    FetchResponseData* responseData = FetchResponseData::createWithBuffer(new BodyStreamBuffer(createFetchDataConsumerHandleFromWebHandle(handle)));
+
+    bool isRedirectResponse = false;
+    FetchResponseData* responseData = nullptr;
+    if (!handle) {
+        ASSERT(IsRedirectStatusCode(m_responseHttpStatusCode));
+        ASSERT(m_request->redirect() == WebURLRequest::FetchRedirectModeManual);
+        isRedirectResponse = true;
+        responseData = FetchResponseData::create();
+    } else {
+        responseData = FetchResponseData::createWithBuffer(new BodyStreamBuffer(createFetchDataConsumerHandleFromWebHandle(handle)));
+    }
     responseData->setStatus(response.httpStatusCode());
     responseData->setStatusMessage(response.httpStatusText());
     for (auto& it : response.httpHeaderFields())
@@ -141,26 +140,9 @@ void FetchManager::Loader::didReceiveResponse(unsigned long, const ResourceRespo
 
     FetchResponseData* taintedResponse = nullptr;
 
-    if (IsRedirectStatusCode(m_responseHttpStatusCode)) {
-        Vector<String> locations;
-        responseData->headerList()->getAll("location", locations);
-        if (locations.size() > 1) {
-            performNetworkError("Multiple Location header.");
-            return;
-        }
-        if (locations.size() == 1) {
-            KURL locationURL(m_request->url(), locations[0]);
-            if (!locationURL.isValid()) {
-                performNetworkError("Invalid Location header.");
-                return;
-            }
-            ASSERT(m_request->redirect() == WebURLRequest::FetchRedirectModeManual);
-            taintedResponse = responseData->createOpaqueRedirectFilteredResponse();
-        }
-        // When the location header doesn't exist, we don't treat the response
-        // as a redirect response, and execute tainting.
-    }
-    if (!taintedResponse) {
+    if (isRedirectResponse) {
+        taintedResponse = responseData->createOpaqueRedirectFilteredResponse();
+    } else {
         switch (m_request->tainting()) {
         case FetchRequestData::BasicTainting:
             taintedResponse = responseData->createBasicFilteredResponse();
@@ -177,6 +159,16 @@ void FetchManager::Loader::didReceiveResponse(unsigned long, const ResourceRespo
     r->headers()->setGuard(Headers::ImmutableGuard);
     m_resolver->resolve(r);
     m_resolver.clear();
+
+    if (isRedirectResponse) {
+        // There is no need to read the body of redirect response because there
+        // is no way to read the body of opaque-redirect filtered response's
+        // internal response.
+        // TODO(horo): If we support any API which expose the internal body, we
+        // will have to read the body. And also HTTPCache changes will be needed
+        // because it doesn't store the body of redirect responses.
+        notifyFinished();
+    }
 }
 
 void FetchManager::Loader::didFinishLoading(unsigned long, double)