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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 "extensions/renderer/script_injection.h"
#include <vector>
#include "base/lazy_instance.h"
#include "base/metrics/histogram.h"
#include "content/public/common/url_constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_messages.h"
#include "extensions/common/permissions/permissions_data.h"
#include "extensions/renderer/dom_activity_logger.h"
#include "extensions/renderer/extension_groups.h"
#include "extensions/renderer/script_context.h"
#include "extensions/renderer/user_script_slave.h"
#include "grit/renderer_resources.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebScriptSource.h"
#include "ui/base/resource/resource_bundle.h"
#include "url/gurl.h"
namespace extensions {
namespace {
// These two strings are injected before and after the Greasemonkey API and
// user script to wrap it in an anonymous scope.
const char kUserScriptHead[] = "(function (unsafeWindow) {\n";
const char kUserScriptTail[] = "\n})(window);";
// Greasemonkey API source that is injected with the scripts.
struct GreasemonkeyApiJsString {
GreasemonkeyApiJsString();
blink::WebScriptSource source;
};
// The below constructor, monstrous as it is, just makes a WebScriptSource from
// the GreasemonkeyApiJs resource.
GreasemonkeyApiJsString::GreasemonkeyApiJsString()
: source(blink::WebScriptSource(blink::WebString::fromUTF8(
ResourceBundle::GetSharedInstance().GetRawDataResource(
IDR_GREASEMONKEY_API_JS).as_string()))) {
}
base::LazyInstance<GreasemonkeyApiJsString> g_greasemonkey_api =
LAZY_INSTANCE_INITIALIZER;
} // namespace
ScriptInjection::ScriptsRunInfo::ScriptsRunInfo() : num_css(0u), num_js(0u) {
}
ScriptInjection::ScriptsRunInfo::~ScriptsRunInfo() {
}
// static
GURL ScriptInjection::GetDocumentUrlForFrame(blink::WebFrame* frame) {
GURL data_source_url = ScriptContext::GetDataSourceURLForFrame(frame);
if (!data_source_url.is_empty() && frame->isViewSourceModeEnabled()) {
data_source_url = GURL(content::kViewSourceScheme + std::string(":") +
data_source_url.spec());
}
return data_source_url;
}
ScriptInjection::ScriptInjection(
scoped_ptr<UserScript> script,
UserScriptSlave* user_script_slave)
: script_(script.Pass()),
extension_id_(script_->extension_id()),
user_script_slave_(user_script_slave),
is_standalone_or_emulate_greasemonkey_(
script_->is_standalone() || script_->emulate_greasemonkey()) {
}
ScriptInjection::~ScriptInjection() {
}
bool ScriptInjection::WantsToRun(blink::WebFrame* frame,
UserScript::RunLocation run_location,
const GURL& document_url) const {
if (frame->parent() && !script_->match_all_frames())
return false; // Only match subframes if the script declared it wanted to.
const Extension* extension = user_script_slave_->GetExtension(extension_id_);
// Since extension info is sent separately from user script info, they can
// be out of sync. We just ignore this situation.
if (!extension)
return false;
// Content scripts are not tab-specific.
static const int kNoTabId = -1;
// We don't have a process id in this context.
static const int kNoProcessId = -1;
GURL effective_document_url = ScriptContext::GetEffectiveDocumentURL(
frame, document_url, script_->match_about_blank());
if (!PermissionsData::CanExecuteScriptOnPage(extension,
effective_document_url,
frame->top()->document().url(),
kNoTabId,
script_.get(),
kNoProcessId,
NULL /* ignore error */)) {
return false;
}
return ShouldInjectCSS(run_location) || ShouldInjectJS(run_location);
}
void ScriptInjection::Inject(blink::WebFrame* frame,
UserScript::RunLocation run_location,
ScriptsRunInfo* scripts_run_info) const {
DCHECK(frame);
DCHECK(scripts_run_info);
DCHECK(WantsToRun(frame, run_location, GetDocumentUrlForFrame(frame)));
DCHECK(user_script_slave_->GetExtension(extension_id_));
if (ShouldInjectCSS(run_location))
InjectCSS(frame, scripts_run_info);
if (ShouldInjectJS(run_location))
InjectJS(frame, scripts_run_info);
}
bool ScriptInjection::ShouldInjectJS(UserScript::RunLocation run_location)
const {
return !script_->js_scripts().empty() &&
script_->run_location() == run_location;
}
bool ScriptInjection::ShouldInjectCSS(UserScript::RunLocation run_location)
const {
return !script_->css_scripts().empty() &&
run_location == UserScript::DOCUMENT_START;
}
void ScriptInjection::InjectJS(blink::WebFrame* frame,
ScriptsRunInfo* scripts_run_info) const {
const UserScript::FileList& js_scripts = script_->js_scripts();
std::vector<blink::WebScriptSource> sources;
scripts_run_info->num_js += js_scripts.size();
for (UserScript::FileList::const_iterator iter = js_scripts.begin();
iter != js_scripts.end();
++iter) {
std::string content = iter->GetContent().as_string();
// We add this dumb function wrapper for standalone user script to
// emulate what Greasemonkey does.
// TODO(aa): I think that maybe "is_standalone" scripts don't exist
// anymore. Investigate.
if (is_standalone_or_emulate_greasemonkey_) {
content.insert(0, kUserScriptHead);
content += kUserScriptTail;
}
sources.push_back(blink::WebScriptSource(
blink::WebString::fromUTF8(content), iter->url()));
}
// Emulate Greasemonkey API for scripts that were converted to extensions
// and "standalone" user scripts.
if (is_standalone_or_emulate_greasemonkey_)
sources.insert(sources.begin(), g_greasemonkey_api.Get().source);
int isolated_world_id =
user_script_slave_->GetIsolatedWorldIdForExtension(
user_script_slave_->GetExtension(extension_id_), frame);
base::ElapsedTimer exec_timer;
DOMActivityLogger::AttachToWorld(isolated_world_id, extension_id_);
frame->executeScriptInIsolatedWorld(isolated_world_id,
&sources.front(),
sources.size(),
EXTENSION_GROUP_CONTENT_SCRIPTS);
UMA_HISTOGRAM_TIMES("Extensions.InjectScriptTime", exec_timer.Elapsed());
for (std::vector<blink::WebScriptSource>::const_iterator iter =
sources.begin();
iter != sources.end();
++iter) {
scripts_run_info->executing_scripts[extension_id_].insert(
GURL(iter->url).path());
}
}
void ScriptInjection::InjectCSS(blink::WebFrame* frame,
ScriptsRunInfo* scripts_run_info) const {
const UserScript::FileList& css_scripts = script_->css_scripts();
scripts_run_info->num_css += css_scripts.size();
for (UserScript::FileList::const_iterator iter = css_scripts.begin();
iter != css_scripts.end();
++iter) {
frame->document().insertStyleSheet(
blink::WebString::fromUTF8(iter->GetContent().as_string()));
}
}
} // namespace extensions
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