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01ce16f1278e16f5d9def071e7be912aff1e4ecf
cef/libcef/browser/net/chrome_scheme_handler.cc
Marshall Greenblatt ad1619dbd7 Fix decoding of about:credits HTML (issue #1980)
2016-09-01 13:32:56 +03:00

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// Copyright (c) 2012 The Chromium Embedded Framework Authors.
// Portions 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 "libcef/browser/net/chrome_scheme_handler.h"
#include <map>
#include <string>
#include <utility>
#include "include/cef_version.h"
#include "include/cef_web_plugin.h"
#include "libcef/browser/frame_host_impl.h"
#include "libcef/browser/net/internal_scheme_handler.h"
#include "libcef/browser/net/url_request_manager.h"
#include "libcef/browser/thread_util.h"
#include "libcef/common/content_client.h"
#include "base/command_line.h"
#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/path_service.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/values.h"
#include "cef/grit/cef_resources.h"
#include "components/grit/components_resources.h"
#include "content/browser/net/view_http_cache_job_factory.h"
#include "content/browser/net/view_blob_internals_job_factory.h"
#include "content/public/common/url_constants.h"
#include "content/public/common/user_agent.h"
#include "ipc/ipc_channel.h"
#include "net/url_request/url_request.h"
#include "ui/base/webui/web_ui_util.h"
#include "ui/resources/grit/webui_resources.h"
#include "ui/resources/grit/webui_resources_map.h"
#include "v8/include/v8.h"
namespace scheme {
const char kChromeURL[] = "chrome://";
namespace {
const char kChromeCreditsDomain[] = "credits";
const char kChromeLicenseDomain[] = "license";
const char kChromeResourcesDomain[] = "resources";
const char kChromeVersionDomain[] = "version";
enum ChromeDomain {
CHROME_UNKNOWN = 0,
CHROME_CREDITS,
CHROME_LICENSE,
CHROME_RESOURCES,
CHROME_VERSION,
};
ChromeDomain GetChromeDomain(const std::string& domain_name) {
static struct {
const char* name;
ChromeDomain domain;
} domains[] = {
{ kChromeCreditsDomain, CHROME_CREDITS },
{ kChromeLicenseDomain, CHROME_LICENSE },
{ kChromeResourcesDomain, CHROME_RESOURCES },
{ kChromeVersionDomain, CHROME_VERSION },
};
for (size_t i = 0; i < sizeof(domains) / sizeof(domains[0]); ++i) {
if (base::EqualsCaseInsensitiveASCII(domains[i].name, domain_name.c_str()))
return domains[i].domain;
}
return CHROME_UNKNOWN;
}
std::string GetOSType() {
#if defined(OS_WIN)
return "Windows";
#elif defined(OS_MACOSX)
return "Mac OS X";
#elif defined(OS_CHROMEOS)
return "Chromium OS";
#elif defined(OS_ANDROID)
return "Android";
#elif defined(OS_LINUX)
return "Linux";
#elif defined(OS_FREEBSD)
return "FreeBSD";
#elif defined(OS_OPENBSD)
return "OpenBSD";
#elif defined(OS_SOLARIS)
return "Solaris";
#else
return "Unknown";
#endif
}
std::string GetCommandLine() {
#if defined(OS_WIN)
return base::WideToUTF8(
base::CommandLine::ForCurrentProcess()->GetCommandLineString());
#elif defined(OS_POSIX)
std::string command_line = "";
typedef std::vector<std::string> ArgvList;
const ArgvList& argv = base::CommandLine::ForCurrentProcess()->argv();
for (ArgvList::const_iterator iter = argv.begin(); iter != argv.end(); iter++)
command_line += " " + *iter;
// TODO(viettrungluu): |command_line| could really have any encoding, whereas
// below we assumes it's UTF-8.
return command_line;
#endif
}
std::string GetModulePath() {
base::FilePath path;
if (PathService::Get(base::FILE_MODULE, &path))
return CefString(path.value());
return std::string();
}
class TemplateParser {
public:
TemplateParser()
: ident_start_("$$"),
ident_end_("$$") {
}
TemplateParser(const std::string& ident_start,
const std::string& ident_end)
: ident_start_(ident_start),
ident_end_(ident_end) {
}
void Add(const std::string& key, const std::string& value) {
values_.insert(std::make_pair(key, value));
}
void Parse(std::string* tmpl) {
int start_pos, end_pos = 0;
int ident_start_len = ident_start_.length();
int ident_end_len = ident_end_.length();
while(true) {
start_pos = tmpl->find(ident_start_, end_pos);
if (start_pos >= 0) {
end_pos = tmpl->find(ident_end_, start_pos + ident_start_len);
if (end_pos >= 0) {
// Found an identifier. Check if a substitution exists.
std::string key = tmpl->substr(start_pos + ident_start_len,
end_pos - start_pos - ident_start_len);
KeyMap::const_iterator it = values_.find(key);
if (it != values_.end()) {
// Peform the substitution.
tmpl->replace(start_pos, end_pos + ident_end_len - start_pos,
it->second);
end_pos = start_pos + it->second.length();
} else {
// Leave the unknown identifier in place.
end_pos += ident_end_len;
}
if (end_pos >= static_cast<int>(tmpl->length()) - ident_start_len -
ident_end_len) {
// Not enough room remaining for more identifiers.
break;
}
} else {
// No end identifier found.
break;
}
} else {
// No start identifier found.
break;
}
}
}
private:
typedef std::map<std::string, std::string> KeyMap;
KeyMap values_;
std::string ident_start_;
std::string ident_end_;
};
// From content/browser/webui/shared_resources_data_source.cc.
using ResourcesMap = base::hash_map<std::string, int>;
// TODO(rkc): Once we have a separate source for apps, remove '*/apps/' aliases.
const char* const kPathAliases[][2] = {
{"../../../third_party/polymer/v1_0/components-chromium/", "polymer/v1_0/"},
{"../../../third_party/web-animations-js/sources/",
"polymer/v1_0/web-animations-js/"},
{"../../views/resources/default_100_percent/common/", "images/apps/"},
{"../../views/resources/default_200_percent/common/", "images/2x/apps/"},
{"../../webui/resources/cr_elements/", "cr_elements/"}};
void AddResource(const std::string& path,
int resource_id,
ResourcesMap* resources_map) {
if (!resources_map->insert(std::make_pair(path, resource_id)).second)
NOTREACHED() << "Redefinition of '" << path << "'";
}
const ResourcesMap* CreateResourcesMap() {
ResourcesMap* result = new ResourcesMap();
for (size_t i = 0; i < kWebuiResourcesSize; ++i) {
const std::string resource_name = kWebuiResources[i].name;
const int resource_id = kWebuiResources[i].value;
AddResource(resource_name, resource_id, result);
for (const char* const (&alias)[2] : kPathAliases) {
if (base::StartsWith(resource_name, alias[0],
base::CompareCase::SENSITIVE)) {
AddResource(alias[1] + resource_name.substr(strlen(alias[0])),
resource_id, result);
}
}
}
return result;
}
const ResourcesMap& GetResourcesMap() {
// This pointer will be intentionally leaked on shutdown.
static const ResourcesMap* resources_map = CreateResourcesMap();
return *resources_map;
}
class Delegate : public InternalHandlerDelegate {
public:
Delegate() {}
bool OnRequest(CefRefPtr<CefBrowser> browser,
CefRefPtr<CefRequest> request,
Action* action) override {
GURL url = GURL(request->GetURL().ToString());
std::string path = url.path();
if (path.length() > 0)
path = path.substr(1);
bool handled = false;
ChromeDomain domain = GetChromeDomain(url.host());
switch (domain) {
case CHROME_CREDITS:
handled = OnCredits(path, action);
break;
case CHROME_LICENSE:
handled = OnLicense(action);
break;
case CHROME_RESOURCES:
handled = OnResources(path, action);
break;
case CHROME_VERSION:
handled = OnVersion(browser, action);
break;
default:
break;
}
if (!handled && domain != CHROME_VERSION) {
LOG(INFO) << "Reguest for unknown chrome resource: " <<
url.spec().c_str();
if (domain != CHROME_RESOURCES) {
action->redirect_url =
GURL(std::string(kChromeURL) + kChromeVersionDomain);
return true;
}
}
return handled;
}
bool OnCredits(const std::string& path, Action* action) {
if (path == "credits.js") {
action->resource_id = IDR_ABOUT_UI_CREDITS_JS;
} else {
action->mime_type = "text/html";
action->resource_id = IDR_ABOUT_UI_CREDITS_HTML;
action->encoding = Action::ENCODING_BROTLI;
}
return true;
}
bool OnLicense(Action* action) {
base::StringPiece piece = CefContentClient::Get()->GetDataResource(
IDR_CEF_LICENSE_TXT, ui::SCALE_FACTOR_NONE);
if (piece.empty()) {
NOTREACHED() << "Failed to load license txt resource.";
return false;
}
std::string html = "<html><head><title>License</title></head><body><pre>" +
piece.as_string() + "</pre></body></html>";
action->mime_type = "text/html";
action->stream = CefStreamReader::CreateForData(
const_cast<char*>(html.c_str()), html.length());
action->stream_size = html.length();
return true;
}
bool OnResources(const std::string& path, Action* action) {
// Implementation based on SharedResourcesDataSource::StartDataRequest.
const ResourcesMap& resources_map = GetResourcesMap();
auto it = resources_map.find(path);
int resource_id = (it != resources_map.end()) ? it->second : -1;
if (resource_id == -1) {
NOTREACHED() << "Failed to find resource id for " << path;
return false;
}
if (resource_id == IDR_WEBUI_CSS_TEXT_DEFAULTS ||
resource_id == IDR_WEBUI_CSS_TEXT_DEFAULTS_MD) {
const std::string& css = resource_id == IDR_WEBUI_CSS_TEXT_DEFAULTS ?
webui::GetWebUiCssTextDefaults() : webui::GetWebUiCssTextDefaultsMd();
DCHECK(!css.empty());
action->mime_type = "text/css";
action->stream = CefStreamReader::CreateForData(
const_cast<char*>(css.c_str()), css.length());
action->stream_size = css.length();
} else {
action->resource_id = resource_id;
}
return true;
}
bool OnVersion(CefRefPtr<CefBrowser> browser,
Action* action) {
base::StringPiece piece = CefContentClient::Get()->GetDataResource(
IDR_CEF_VERSION_HTML, ui::SCALE_FACTOR_NONE);
if (piece.empty()) {
NOTREACHED() << "Failed to load version html resource.";
return false;
}
TemplateParser parser;
parser.Add("YEAR", MAKE_STRING(COPYRIGHT_YEAR));
parser.Add("CEF", CEF_VERSION);
parser.Add("CHROMIUM",
base::StringPrintf("%d.%d.%d.%d",
CHROME_VERSION_MAJOR,
CHROME_VERSION_MINOR,
CHROME_VERSION_BUILD,
CHROME_VERSION_PATCH));
parser.Add("OS", GetOSType());
parser.Add("WEBKIT", content::GetWebKitVersion());
parser.Add("JAVASCRIPT", v8::V8::GetVersion());
parser.Add("FLASH", std::string()); // Value populated asynchronously.
parser.Add("USERAGENT", CefContentClient::Get()->GetUserAgent());
parser.Add("COMMANDLINE", GetCommandLine());
parser.Add("MODULEPATH", GetModulePath());
parser.Add("CACHEPATH", browser.get() ?
browser->GetHost()->GetRequestContext()->GetCachePath() : "");
std::string tmpl = piece.as_string();
parser.Parse(&tmpl);
action->mime_type = "text/html";
action->stream = CefStreamReader::CreateForData(
const_cast<char*>(tmpl.c_str()), tmpl.length());
action->stream_size = tmpl.length();
return true;
}
};
void DidFinishChromeVersionLoad(CefRefPtr<CefFrame> frame) {
// Retieve Flash version information and update asynchronously.
class Visitor : public CefWebPluginInfoVisitor {
public:
Visitor(CefRefPtr<CefFrame> frame)
: frame_(frame) {
}
bool Visit(CefRefPtr<CefWebPluginInfo> info,
int count, int total) override {
std::string name = info->GetName();
if (name == "Shockwave Flash") {
if (frame_->IsValid()) {
std::string version = info->GetVersion();
frame_->ExecuteJavaScript(
"document.getElementById('flash').innerText = '" + version + "';",
std::string(), 0);
}
return false;
}
return true;
}
private:
CefRefPtr<CefFrame> frame_;
IMPLEMENT_REFCOUNTING(Visitor);
};
CefVisitWebPluginInfo(new Visitor(frame));
}
// Wrapper for a ChromeProtocolHandler instance from
// content/browser/webui/url_data_manager_backend.cc.
class ChromeProtocolHandlerWrapper :
public net::URLRequestJobFactory::ProtocolHandler {
public:
ChromeProtocolHandlerWrapper(
CefURLRequestManager* request_manager,
std::unique_ptr<net::URLRequestJobFactory::ProtocolHandler>
chrome_protocol_handler)
: request_manager_(request_manager),
chrome_protocol_handler_(std::move(chrome_protocol_handler)) {
DCHECK(request_manager_);
}
net::URLRequestJob* MaybeCreateJob(
net::URLRequest* request,
net::NetworkDelegate* network_delegate) const override {
// Keep synchronized with the checks in
// ChromeProtocolHandler::MaybeCreateJob.
if (content::ViewHttpCacheJobFactory::IsSupportedURL(request->url()) ||
(request->url().SchemeIs(content::kChromeUIScheme) &&
request->url().host() == content::kChromeUIAppCacheInternalsHost) ||
content::ViewBlobInternalsJobFactory::IsSupportedURL(request->url()) ||
(request->url().SchemeIs(content::kChromeUIScheme) &&
request->url().host() == content::kChromeUIHistogramHost)) {
return chrome_protocol_handler_->MaybeCreateJob(request,
network_delegate);
}
// Use the protocol handler registered with CEF.
return request_manager_->GetRequestJob(request, network_delegate);
}
private:
CefURLRequestManager* request_manager_;
std::unique_ptr<net::URLRequestJobFactory::ProtocolHandler>
chrome_protocol_handler_;
};
} // namespace
void RegisterChromeHandler(CefURLRequestManager* request_manager) {
request_manager->AddFactory(
content::kChromeUIScheme,
std::string(),
CreateInternalHandlerFactory(base::WrapUnique(new Delegate())));
}
bool WillHandleBrowserAboutURL(GURL* url,
content::BrowserContext* browser_context) {
std::string text = url->possibly_invalid_spec();
if (text.find("about:") == 0 && text != "about:blank" && text.length() > 6) {
// Redirect about: URLs to chrome://
*url = GURL(kChromeURL + text.substr(6));
}
// Allow the redirection to proceed.
return false;
}
void DidFinishChromeLoad(CefRefPtr<CefFrame> frame,
const GURL& validated_url) {
ChromeDomain domain = GetChromeDomain(validated_url.host());
switch (domain) {
case CHROME_VERSION:
DidFinishChromeVersionLoad(frame);
default:
break;
}
}
std::unique_ptr<net::URLRequestJobFactory::ProtocolHandler>
WrapChromeProtocolHandler(
CefURLRequestManager* request_manager,
std::unique_ptr<net::URLRequestJobFactory::ProtocolHandler>
chrome_protocol_handler) {
std::unique_ptr<net::URLRequestJobFactory::ProtocolHandler> ret(
new ChromeProtocolHandlerWrapper(request_manager,
std::move(chrome_protocol_handler)));
return ret;
}
} // namespace scheme
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