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// Copyright (c) 2012 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/ui/webui/devtools_ui.h"
#include <string>
#include "base/memory/ref_counted_memory.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/net/chrome_url_request_context.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/url_constants.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/devtools_http_handler.h"
#include "content/public/browser/url_data_source.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_ui.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "net/url_request/url_request_context_getter.h"
#include "ui/base/resource/resource_bundle.h"
using content::BrowserThread;
using content::WebContents;
namespace {
std::string PathWithoutParams(const std::string& path) {
return GURL(std::string("chrome-devtools://devtools/") + path)
.path().substr(1);
}
const char kRemoteFrontendDomain[] = "chrome-devtools-frontend.appspot.com";
const char kRemoteFrontendBase[] =
"https://chrome-devtools-frontend.appspot.com/";
const char kHttpNotFound[] = "HTTP/1.1 404 Not Found\n\n";
#if defined(DEBUG_DEVTOOLS)
// Local frontend url provided by InspectUI.
const char kLocalFrontendURL[] =
"chrome-devtools://devtools/bundled/devtools.html";
#endif // defined(DEBUG_DEVTOOLS)
class FetchRequest : public net::URLFetcherDelegate {
public:
FetchRequest(net::URLRequestContextGetter* request_context,
const GURL& url,
const content::URLDataSource::GotDataCallback& callback)
: callback_(callback) {
if (!url.is_valid()) {
OnURLFetchComplete(NULL);
return;
}
fetcher_.reset(net::URLFetcher::Create(url, net::URLFetcher::GET, this));
fetcher_->SetRequestContext(request_context);
fetcher_->Start();
}
private:
virtual ~FetchRequest() {}
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE {
std::string response;
if (source)
source->GetResponseAsString(&response);
else
response = kHttpNotFound;
callback_.Run(base::RefCountedString::TakeString(&response));
delete this;
}
scoped_ptr<net::URLFetcher> fetcher_;
content::URLDataSource::GotDataCallback callback_;
};
std::string GetMimeTypeForPath(const std::string& path) {
std::string filename = PathWithoutParams(path);
if (EndsWith(filename, ".html", false)) {
return "text/html";
} else if (EndsWith(filename, ".css", false)) {
return "text/css";
} else if (EndsWith(filename, ".js", false)) {
return "application/javascript";
} else if (EndsWith(filename, ".png", false)) {
return "image/png";
} else if (EndsWith(filename, ".gif", false)) {
return "image/gif";
} else if (EndsWith(filename, ".manifest", false)) {
return "text/cache-manifest";
}
NOTREACHED();
return "text/plain";
}
// An URLDataSource implementation that handles chrome-devtools://devtools/
// requests. Three types of requests could be handled based on the URL path:
// 1. /bundled/: bundled DevTools frontend is served.
// 2. /remote/: Remote DevTools frontend is served from App Engine.
// 3. /localhost/: Remote frontend is served from localhost:9222. This is a
// debug only feature hidden beihnd a compile time flag DEBUG_DEVTOOLS.
class DevToolsDataSource : public content::URLDataSource {
public:
explicit DevToolsDataSource(net::URLRequestContextGetter*
request_context) : request_context_(request_context) {
}
// content::URLDataSource implementation.
virtual std::string GetSource() const OVERRIDE {
return chrome::kChromeUIDevToolsHost;
}
virtual void StartDataRequest(
const std::string& path,
int render_process_id,
int render_view_id,
const content::URLDataSource::GotDataCallback& callback) OVERRIDE {
std::string bundled_path_prefix(chrome::kChromeUIDevToolsBundledPath);
bundled_path_prefix += "/";
if (StartsWithASCII(path, bundled_path_prefix, false)) {
StartBundledDataRequest(path.substr(bundled_path_prefix.length()),
render_process_id,
render_view_id,
callback);
return;
}
std::string remote_path_prefix(chrome::kChromeUIDevToolsRemotePath);
remote_path_prefix += "/";
if (StartsWithASCII(path, remote_path_prefix, false)) {
StartRemoteDataRequest(path.substr(remote_path_prefix.length()),
render_process_id,
render_view_id,
callback);
return;
}
}
// Serves bundled DevTools frontend from ResourceBundle.
void StartBundledDataRequest(
const std::string& path,
int render_process_id,
int render_view_id,
const content::URLDataSource::GotDataCallback& callback) {
std::string filename = PathWithoutParams(path);
int resource_id =
content::DevToolsHttpHandler::GetFrontendResourceId(filename);
DLOG_IF(WARNING, -1 == resource_id) << "Unable to find dev tool resource: "
<< filename << ". If you compiled with debug_devtools=1, try running"
" with --debug-devtools.";
const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
scoped_refptr<base::RefCountedStaticMemory> bytes(rb.LoadDataResourceBytes(
resource_id));
callback.Run(bytes.get());
}
// Serves remote DevTools frontend from hard-coded App Engine domain.
void StartRemoteDataRequest(
const std::string& path,
int render_process_id,
int render_view_id,
const content::URLDataSource::GotDataCallback& callback) {
GURL url = GURL(kRemoteFrontendBase + path);
CHECK_EQ(url.host(), kRemoteFrontendDomain);
new FetchRequest(request_context_.get(), url, callback);
}
virtual std::string GetMimeType(const std::string& path) const OVERRIDE {
return GetMimeTypeForPath(path);
}
virtual bool ShouldAddContentSecurityPolicy() const OVERRIDE {
return false;
}
private:
virtual ~DevToolsDataSource() {}
scoped_refptr<net::URLRequestContextGetter> request_context_;
DISALLOW_COPY_AND_ASSIGN(DevToolsDataSource);
};
} // namespace
// static
GURL DevToolsUI::GetProxyURL(const std::string& frontend_url) {
GURL url(frontend_url);
#if defined(DEBUG_DEVTOOLS)
if (!url.is_valid() || url.host() != kRemoteFrontendDomain) {
return GURL(kLocalFrontendURL);
}
#endif // defined(DEBUG_DEVTOOLS)
CHECK(url.is_valid());
CHECK_EQ(url.host(), kRemoteFrontendDomain);
return GURL(base::StringPrintf("%s://%s/%s/%s",
chrome::kChromeDevToolsScheme,
chrome::kChromeUIDevToolsHost,
chrome::kChromeUIDevToolsRemotePath,
url.path().substr(1).c_str()));
}
DevToolsUI::DevToolsUI(content::WebUI* web_ui) : WebUIController(web_ui) {
web_ui->SetBindings(0);
Profile* profile = Profile::FromWebUI(web_ui);
content::URLDataSource::Add(
profile,
new DevToolsDataSource(profile->GetRequestContext()));
}
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