[Fetch] Support blob: scheme

third_party/WebKit/Source/modules/fetch/FetchManager.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 "modules/fetch/FetchManager.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 186 matching lines @@
     visitor->trace(m_resolver);
     visitor->trace(m_request);
     visitor->trace(m_integrityVerifier);
     ContextLifecycleObserver::trace(visitor);
 }
 
 void FetchManager::Loader::didReceiveResponse(unsigned long, const ResourceResponse& response, PassOwnPtr<WebDataConsumerHandle> handle)
 {
     ASSERT(handle);
 
+    if (response.url().protocolIs("blob") && response.httpStatusCode() == 404) {
+        // "If |blob| is null, return a network error."
+        // https://fetch.spec.whatwg.org/#concept-basic-fetch
+        performNetworkError("Blob not found.");
+        return;
+    }
+
+    if (response.url().protocolIs("blob") && response.httpStatusCode() == 405) {
+        performNetworkError("Only 'GET' method is allowed for blob URLs.");
+        return;
+    }
+
     m_responseHttpStatusCode = response.httpStatusCode();
 
     if (response.url().protocolIsData()) {
         if (m_request->url() == response.url()) {
             // A direct request to data.
             m_request->setResponseTainting(FetchRequestData::BasicTainting);
         } else {
             // A redirect to data: scheme occured.
             // Redirects to data URLs are rejected by the spec because
             // same-origin data-URL flag is unset, except for no-cors mode.
@@ skipping 257 matching lines @@
 
 void FetchManager::Loader::performBasicFetch()
 {
     // "To perform a basic fetch using |request|, switch on |request|'s url's
     // scheme, and run the associated steps:"
     if (SchemeRegistry::shouldTreatURLSchemeAsSupportingFetchAPI(m_request->url().protocol())) {
         // "Return the result of performing an HTTP fetch using |request|."
         performHTTPFetch(false, false);
     } else if (m_request->url().protocolIsData()) {
         performDataFetch();
+    } else if (m_request->url().protocolIs("blob")) {
+        performHTTPFetch(false, false);
     } else {
         // FIXME: implement other protocols.
         performNetworkError("Fetch API cannot load " + m_request->url().string() + ". URL scheme \"" + m_request->url().protocol() + "\" is not supported.");
     }
 }
 
 void FetchManager::Loader::performNetworkError(const String& message)
 {
     failed(message);
 }
 
 void FetchManager::Loader::performHTTPFetch(bool corsFlag, bool corsPreflightFlag)
 {
-    ASSERT(SchemeRegistry::shouldTreatURLSchemeAsSupportingFetchAPI(m_request->url().protocol()));
+    ASSERT(SchemeRegistry::shouldTreatURLSchemeAsSupportingFetchAPI(m_request->url().protocol()) || (m_request->url().protocolIs("blob") && !corsFlag && !corsPreflightFlag));
     // CORS preflight fetch procedure is implemented inside DocumentThreadableLoader.
 
     // "1. Let |HTTPRequest| be a copy of |request|, except that |HTTPRequest|'s
     //  body is a tee of |request|'s body."
     // We use ResourceRequest class for HTTPRequest.
     // FIXME: Support body.
     ResourceRequest request(m_request->url());
     request.setRequestContext(m_request->context());
     request.setHTTPMethod(m_request->method());
     const Vector<OwnPtr<FetchHeaderList::Header>>& list = m_request->headerList()->list();
@@ skipping 178 matching lines @@
     loader->dispose();
 }
 
 DEFINE_TRACE(FetchManager)
 {
     visitor->trace(m_executionContext);
     visitor->trace(m_loaders);
 }
 
 } // namespace blink