FetchResponseData* FetchResponseData::createCORSFilteredResponse()
{
// "A CORS filtered response is a filtered response whose type is |CORS|,
// header list excludes all headers in internal response's header list,
// except those whose name is either one of `Cache-Control`,
// `Content-Language`, `Content-Type`, `Expires`, `Last-Modified`, and
// `Pragma`, and except those whose name is one of the values resulting from
// parsing `Access-Control-Expose-Headers` in internal response's header
// list."
FetchResponseData* response = new FetchResponseData(CORSType, m_status, m_statusMessage);
response->m_url = m_url;
HTTPHeaderSet accessControlExposeHeaderSet;
String accessControlExposeHeaders;
if (m_headerList->get("access-control-expose-headers", accessControlExposeHeaders))
parseAccessControlExposeHeadersAllowList(accessControlExposeHeaders, accessControlExposeHeaderSet);
for (size_t i = 0; i < m_headerList->size(); ++i) {
const FetchHeaderList::Header* header = m_headerList->list()[i].get();
if (!isOnAccessControlResponseHeaderWhitelist(header->first) && !accessControlExposeHeaderSet.contains(header->first))
continue;
response->m_headerList->append(header->first, header->second);
}
response->m_buffer = m_buffer;
response->m_mimeType = m_mimeType;
response->m_internalResponse = this;
return response;
}
void WebAssociatedURLLoaderImpl::ClientAdapter::didReceiveResponse(
unsigned long,
const ResourceResponse& response,
std::unique_ptr<WebDataConsumerHandle> handle) {
ALLOW_UNUSED_LOCAL(handle);
DCHECK(!handle);
if (!m_client)
return;
if (m_options.exposeAllResponseHeaders ||
m_options.crossOriginRequestPolicy !=
WebAssociatedURLLoaderOptions::
CrossOriginRequestPolicyUseAccessControl) {
// Use the original ResourceResponse.
m_client->didReceiveResponse(WrappedResourceResponse(response));
return;
}
HTTPHeaderSet exposedHeaders;
extractCorsExposedHeaderNamesList(response, exposedHeaders);
HTTPHeaderSet blockedHeaders;
for (const auto& header : response.httpHeaderFields()) {
if (FetchUtils::isForbiddenResponseHeaderName(header.key) ||
(!isOnAccessControlResponseHeaderWhitelist(header.key) &&
!exposedHeaders.contains(header.key)))
blockedHeaders.add(header.key);
}
if (blockedHeaders.isEmpty()) {
// Use the original ResourceResponse.
m_client->didReceiveResponse(WrappedResourceResponse(response));
return;
}
// If there are blocked headers, copy the response so we can remove them.
WebURLResponse validatedResponse = WrappedResourceResponse(response);
for (const auto& header : blockedHeaders)
validatedResponse.clearHTTPHeaderField(header);
m_client->didReceiveResponse(validatedResponse);
}
