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// 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 "chrome/browser/extensions/chrome_url_request_util.h"
#include <string>
#include "base/files/file_path.h"
#include "base/memory/weak_ptr.h"
#include "base/path_service.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/task_runner_util.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/extensions/chrome_manifest_url_handlers.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/resource_request_info.h"
#include "extensions/browser/component_extension_resource_manager.h"
#include "extensions/browser/extension_protocols.h"
#include "extensions/browser/extensions_browser_client.h"
#include "extensions/browser/info_map.h"
#include "extensions/browser/url_request_util.h"
#include "extensions/common/file_util.h"
#include "net/base/mime_util.h"
#include "net/base/net_errors.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_response_info.h"
#include "net/url_request/url_request.h"
#include "net/url_request/url_request_simple_job.h"
#include "ui/base/resource/resource_bundle.h"
using content::BrowserThread;
using content::ResourceType;
using extensions::ExtensionsBrowserClient;
namespace {
// A request for an extension resource in a Chrome .pak file. These are used
// by component extensions.
class URLRequestResourceBundleJob : public net::URLRequestSimpleJob {
public:
URLRequestResourceBundleJob(net::URLRequest* request,
net::NetworkDelegate* network_delegate,
const base::FilePath& filename,
int resource_id,
const std::string& content_security_policy,
bool send_cors_header)
: net::URLRequestSimpleJob(request, network_delegate),
filename_(filename),
resource_id_(resource_id),
weak_factory_(this) {
// Leave cache headers out of resource bundle requests.
response_info_.headers = extensions::BuildHttpHeaders(
content_security_policy, send_cors_header, base::Time());
}
// Overridden from URLRequestSimpleJob:
int GetRefCountedData(
std::string* mime_type,
std::string* charset,
scoped_refptr<base::RefCountedMemory>* data,
const net::CompletionCallback& callback) const override {
const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
*data = rb.LoadDataResourceBytes(resource_id_);
// Add the Content-Length header now that we know the resource length.
response_info_.headers->AddHeader(
base::StringPrintf("%s: %s", net::HttpRequestHeaders::kContentLength,
base::UintToString((*data)->size()).c_str()));
std::string* read_mime_type = new std::string;
bool posted = base::PostTaskAndReplyWithResult(
BrowserThread::GetBlockingPool(), FROM_HERE,
base::Bind(&net::GetMimeTypeFromFile, filename_,
base::Unretained(read_mime_type)),
base::Bind(&URLRequestResourceBundleJob::OnMimeTypeRead,
weak_factory_.GetWeakPtr(), mime_type, charset, *data,
base::Owned(read_mime_type), callback));
DCHECK(posted);
return net::ERR_IO_PENDING;
}
void GetResponseInfo(net::HttpResponseInfo* info) override {
*info = response_info_;
}
private:
~URLRequestResourceBundleJob() override {}
void OnMimeTypeRead(std::string* out_mime_type,
std::string* charset,
scoped_refptr<base::RefCountedMemory> data,
std::string* read_mime_type,
const net::CompletionCallback& callback,
bool read_result) {
*out_mime_type = *read_mime_type;
if (StartsWithASCII(*read_mime_type, "text/", false)) {
// All of our HTML files should be UTF-8 and for other resource types
// (like images), charset doesn't matter.
DCHECK(base::IsStringUTF8(base::StringPiece(
reinterpret_cast<const char*>(data->front()), data->size())));
*charset = "utf-8";
}
int result = read_result ? net::OK : net::ERR_INVALID_URL;
callback.Run(result);
}
// We need the filename of the resource to determine the mime type.
base::FilePath filename_;
// The resource bundle id to load.
int resource_id_;
net::HttpResponseInfo response_info_;
mutable base::WeakPtrFactory<URLRequestResourceBundleJob> weak_factory_;
};
} // namespace
namespace extensions {
namespace chrome_url_request_util {
bool AllowCrossRendererResourceLoad(net::URLRequest* request,
bool is_incognito,
const Extension* extension,
InfoMap* extension_info_map,
bool* allowed) {
if (url_request_util::AllowCrossRendererResourceLoad(
request, is_incognito, extension, extension_info_map, allowed)) {
return true;
}
// If there aren't any explicitly marked web accessible resources, the
// load should be allowed only if it is by DevTools. A close approximation is
// checking if the extension contains a DevTools page.
if (!chrome_manifest_urls::GetDevToolsPage(extension).is_empty()) {
*allowed = true;
return true;
}
// Couldn't determine if the resource is allowed or not.
return false;
}
net::URLRequestJob* MaybeCreateURLRequestResourceBundleJob(
net::URLRequest* request,
net::NetworkDelegate* network_delegate,
const base::FilePath& directory_path,
const std::string& content_security_policy,
bool send_cors_header) {
base::FilePath resources_path;
base::FilePath relative_path;
// Try to load extension resources from chrome resource file if
// directory_path is a descendant of resources_path. resources_path
// corresponds to src/chrome/browser/resources in source tree.
if (PathService::Get(chrome::DIR_RESOURCES, &resources_path) &&
// Since component extension resources are included in
// component_extension_resources.pak file in resources_path, calculate
// extension relative path against resources_path.
resources_path.AppendRelativePath(directory_path, &relative_path)) {
base::FilePath request_path =
extensions::file_util::ExtensionURLToRelativeFilePath(request->url());
int resource_id = 0;
if (ExtensionsBrowserClient::Get()
->GetComponentExtensionResourceManager()
->IsComponentExtensionResource(
directory_path, request_path, &resource_id)) {
relative_path = relative_path.Append(request_path);
relative_path = relative_path.NormalizePathSeparators();
return new URLRequestResourceBundleJob(request,
network_delegate,
relative_path,
resource_id,
content_security_policy,
send_cors_header);
}
}
return NULL;
}
} // namespace chrome_url_request_util
} // namespace extensions
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