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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/user_script_set.h"
#include "base/memory/ref_counted.h"
#include "content/public/common/url_constants.h"
#include "content/public/renderer/render_thread.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_set.h"
#include "extensions/common/permissions/permissions_data.h"
#include "extensions/renderer/extension_injection_host.h"
#include "extensions/renderer/extensions_renderer_client.h"
#include "extensions/renderer/injection_host.h"
#include "extensions/renderer/script_context.h"
#include "extensions/renderer/script_injection.h"
#include "extensions/renderer/user_script_injector.h"
#include "extensions/renderer/web_ui_injection_host.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "url/gurl.h"
namespace extensions {
namespace {
GURL 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;
}
} // namespace
UserScriptSet::UserScriptSet(const ExtensionSet* extensions)
: extensions_(extensions) {
}
UserScriptSet::~UserScriptSet() {
}
void UserScriptSet::AddObserver(Observer* observer) {
observers_.AddObserver(observer);
}
void UserScriptSet::RemoveObserver(Observer* observer) {
observers_.RemoveObserver(observer);
}
void UserScriptSet::GetActiveExtensionIds(
std::set<std::string>* ids) const {
for (ScopedVector<UserScript>::const_iterator iter = scripts_.begin();
iter != scripts_.end();
++iter) {
if ((*iter)->host_id().type() != HostID::EXTENSIONS)
continue;
DCHECK(!(*iter)->extension_id().empty());
ids->insert((*iter)->extension_id());
}
}
void UserScriptSet::GetInjections(
ScopedVector<ScriptInjection>* injections,
blink::WebFrame* web_frame,
int tab_id,
UserScript::RunLocation run_location) {
GURL document_url = GetDocumentUrlForFrame(web_frame);
for (ScopedVector<UserScript>::const_iterator iter = scripts_.begin();
iter != scripts_.end();
++iter) {
scoped_ptr<ScriptInjection> injection = GetInjectionForScript(
*iter,
web_frame,
tab_id,
run_location,
document_url,
false /* is_declarative */);
if (injection.get())
injections->push_back(injection.release());
}
}
bool UserScriptSet::UpdateUserScripts(base::SharedMemoryHandle shared_memory,
const std::set<HostID>& changed_hosts) {
bool only_inject_incognito =
ExtensionsRendererClient::Get()->IsIncognitoProcess();
// Create the shared memory object (read only).
shared_memory_.reset(new base::SharedMemory(shared_memory, true));
if (!shared_memory_.get())
return false;
// First get the size of the memory block.
if (!shared_memory_->Map(sizeof(Pickle::Header)))
return false;
Pickle::Header* pickle_header =
reinterpret_cast<Pickle::Header*>(shared_memory_->memory());
// Now map in the rest of the block.
int pickle_size = sizeof(Pickle::Header) + pickle_header->payload_size;
shared_memory_->Unmap();
if (!shared_memory_->Map(pickle_size))
return false;
// Unpickle scripts.
size_t num_scripts = 0;
Pickle pickle(reinterpret_cast<char*>(shared_memory_->memory()), pickle_size);
PickleIterator iter(pickle);
CHECK(iter.ReadSizeT(&num_scripts));
scripts_.clear();
scripts_.reserve(num_scripts);
for (size_t i = 0; i < num_scripts; ++i) {
scoped_ptr<UserScript> script(new UserScript());
script->Unpickle(pickle, &iter);
// Note that this is a pointer into shared memory. We don't own it. It gets
// cleared up when the last renderer or browser process drops their
// reference to the shared memory.
for (size_t j = 0; j < script->js_scripts().size(); ++j) {
const char* body = NULL;
int body_length = 0;
CHECK(iter.ReadData(&body, &body_length));
script->js_scripts()[j].set_external_content(
base::StringPiece(body, body_length));
}
for (size_t j = 0; j < script->css_scripts().size(); ++j) {
const char* body = NULL;
int body_length = 0;
CHECK(iter.ReadData(&body, &body_length));
script->css_scripts()[j].set_external_content(
base::StringPiece(body, body_length));
}
if (only_inject_incognito && !script->is_incognito_enabled())
continue; // This script shouldn't run in an incognito tab.
scripts_.push_back(script.release());
}
FOR_EACH_OBSERVER(Observer,
observers_,
OnUserScriptsUpdated(changed_hosts, scripts_.get()));
return true;
}
scoped_ptr<ScriptInjection> UserScriptSet::GetDeclarativeScriptInjection(
int script_id,
blink::WebFrame* web_frame,
int tab_id,
UserScript::RunLocation run_location,
const GURL& document_url) {
for (ScopedVector<UserScript>::const_iterator it = scripts_.begin();
it != scripts_.end();
++it) {
if ((*it)->id() == script_id) {
return GetInjectionForScript(*it,
web_frame,
tab_id,
run_location,
document_url,
true /* is_declarative */);
}
}
return scoped_ptr<ScriptInjection>();
}
// TODO(dcheng): Scripts can't be injected on a remote frame, so this function
// signature needs to be updated.
scoped_ptr<ScriptInjection> UserScriptSet::GetInjectionForScript(
UserScript* script,
blink::WebFrame* web_frame,
int tab_id,
UserScript::RunLocation run_location,
const GURL& document_url,
bool is_declarative) {
scoped_ptr<ScriptInjection> injection;
scoped_ptr<const InjectionHost> injection_host;
const HostID& host_id = script->host_id();
if (host_id.type() == HostID::EXTENSIONS) {
injection_host = ExtensionInjectionHost::Create(host_id.id(), extensions_);
if (!injection_host)
return injection.Pass();
} else {
DCHECK_EQ(host_id.type(), HostID::WEBUI);
injection_host.reset(new WebUIInjectionHost(host_id));
}
if (web_frame->parent() && !script->match_all_frames())
return injection.Pass(); // Only match subframes if the script declared it.
GURL effective_document_url = ScriptContext::GetEffectiveDocumentURL(
web_frame, document_url, script->match_about_blank());
if (!script->MatchesURL(effective_document_url))
return injection.Pass();
scoped_ptr<ScriptInjector> injector(new UserScriptInjector(script,
this,
is_declarative));
blink::WebFrame* top_frame = web_frame->top();
// It doesn't make sense to do script injection for remote frames, since they
// cannot host any documents or content.
// TODO(kalman): Fix this properly by moving all security checks into the
// browser. See http://crbug.com/466373 for ongoing work here.
if (top_frame->isWebRemoteFrame())
return injection.Pass();
if (injector->CanExecuteOnFrame(injection_host.get(), web_frame,
-1, // Content scripts are not tab-specific.
top_frame->document().url()) ==
PermissionsData::ACCESS_DENIED) {
return injection.Pass();
}
bool inject_css = !script->css_scripts().empty() &&
run_location == UserScript::DOCUMENT_START;
bool inject_js =
!script->js_scripts().empty() && script->run_location() == run_location;
if (inject_css || inject_js) {
injection.reset(new ScriptInjection(
injector.Pass(),
web_frame->toWebLocalFrame(),
injection_host.Pass(),
run_location,
tab_id));
}
return injection.Pass();
}
} // namespace extensions
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