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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "extensions/browser/embedder_user_script_loader.h"
#include <set>
#include <string>
#include <utility>
#include "base/functional/bind.h"
#include "base/memory/ref_counted.h"
#include "base/strings/string_util.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/thread_pool.h"
#include "components/guest_view/buildflags/buildflags.h"
#include "content/public/browser/browser_context.h"
#include "extensions/browser/url_fetcher.h"
#include "extensions/browser/user_script_loader.h"
#include "extensions/buildflags/buildflags.h"
#include "extensions/common/mojom/host_id.mojom.h"
#include "extensions/common/user_script.h"
#include "url/gurl.h"
#if BUILDFLAG(ENABLE_GUEST_VIEW)
#include "extensions/browser/guest_view/web_view/controlled_frame_embedder_url_fetcher.h"
#include "extensions/browser/guest_view/web_view/web_ui/web_ui_url_fetcher.h"
#endif
namespace {
void SerializeOnBlockingTask(
scoped_refptr<base::SequencedTaskRunner> task_runner,
extensions::UserScriptList user_scripts,
extensions::UserScriptLoader::LoadScriptsCallback callback) {
base::ReadOnlySharedMemoryRegion memory =
extensions::UserScriptLoader::Serialize(user_scripts);
task_runner->PostTask(
FROM_HERE, base::BindOnce(std::move(callback), std::move(user_scripts),
std::move(memory)));
}
} // namespace
struct EmbedderUserScriptLoader::UserScriptRenderInfo {
const int render_process_id;
const int render_frame_id;
};
EmbedderUserScriptLoader::EmbedderUserScriptLoader(
content::BrowserContext* browser_context,
const extensions::mojom::HostID& host_id)
: UserScriptLoader(browser_context, host_id), complete_fetchers_(0) {
SetReady(true);
}
EmbedderUserScriptLoader::~EmbedderUserScriptLoader() {
}
void EmbedderUserScriptLoader::AddScripts(extensions::UserScriptList scripts,
int render_process_id,
int render_frame_id,
ScriptsLoadedCallback callback) {
UserScriptRenderInfo info{.render_process_id = render_process_id,
.render_frame_id = render_frame_id};
for (const std::unique_ptr<extensions::UserScript>& script : scripts) {
script_render_info_map_.emplace(script->id(), info);
}
extensions::UserScriptLoader::AddScripts(std::move(scripts),
std::move(callback));
}
void EmbedderUserScriptLoader::LoadScripts(
extensions::UserScriptList user_scripts,
const std::set<std::string>& added_script_ids,
LoadScriptsCallback callback) {
DCHECK(user_scripts_cache_.empty()) << "Loading scripts in flight.";
user_scripts_cache_ = std::move(user_scripts);
scripts_loaded_callback_ = std::move(callback);
// The total number of the tasks is used to trace whether all the fetches
// are complete. Therefore, we store all the fetcher pointers in |fetchers_|
// before we get this number. Once we get the total number, start each
// fetch tasks.
DCHECK_EQ(0u, complete_fetchers_);
for (const std::unique_ptr<extensions::UserScript>& script :
user_scripts_cache_) {
if (added_script_ids.count(script->id()) == 0) {
continue;
}
auto iter = script_render_info_map_.find(script->id());
CHECK(iter != script_render_info_map_.end());
int render_process_id = iter->second.render_process_id;
int render_frame_id = iter->second.render_frame_id;
CreateEmbedderURLFetchers(script->js_scripts(), render_process_id,
render_frame_id);
CreateEmbedderURLFetchers(script->css_scripts(), render_process_id,
render_frame_id);
script_render_info_map_.erase(iter);
}
// If no fetch is needed, call OnEmbedderURLFetchComplete directly.
if (fetchers_.empty()) {
OnEmbedderURLFetchComplete();
return;
}
for (const auto& fetcher : fetchers_) {
fetcher->Start();
}
}
void EmbedderUserScriptLoader::CreateEmbedderURLFetchers(
const extensions::UserScript::ContentList& contents,
int render_process_id,
int render_frame_id) {
for (const std::unique_ptr<extensions::UserScript::Content>& content :
contents) {
if (!content->GetContent().empty()) {
continue;
}
std::unique_ptr<extensions::URLFetcher> fetcher;
switch (host_id_.type) {
case extensions::mojom::HostID::HostType::kWebUi:
#if BUILDFLAG(ENABLE_GUEST_VIEW)
fetcher = std::make_unique<extensions::WebUIURLFetcher>(
render_process_id, render_frame_id, content->url(),
base::BindOnce(
&EmbedderUserScriptLoader::OnSingleEmbedderURLFetchComplete,
weak_ptr_factory_.GetWeakPtr(), content.get()));
break;
#else
NOTREACHED();
#endif
case extensions::mojom::HostID::HostType::kControlledFrameEmbedder:
#if BUILDFLAG(ENABLE_GUEST_VIEW)
fetcher = std::make_unique<
extensions::ControlledFrameEmbedderURLFetcher>(
render_process_id, render_frame_id, content->url(),
base::BindOnce(
&EmbedderUserScriptLoader::OnSingleEmbedderURLFetchComplete,
weak_ptr_factory_.GetWeakPtr(), content.get()));
break;
#else
NOTREACHED();
#endif
case extensions::mojom::HostID::HostType::kExtensions:
NOTREACHED();
}
fetchers_.push_back(std::move(fetcher));
}
}
void EmbedderUserScriptLoader::OnSingleEmbedderURLFetchComplete(
extensions::UserScript::Content* content,
bool success,
std::unique_ptr<std::string> data) {
if (success) {
// Remove BOM from |data|.
if (base::StartsWith(*data, base::kUtf8ByteOrderMark)) {
data->erase(0, strlen(base::kUtf8ByteOrderMark));
}
content->set_content(std::move(*data));
}
++complete_fetchers_;
if (complete_fetchers_ == fetchers_.size()) {
complete_fetchers_ = 0;
OnEmbedderURLFetchComplete();
fetchers_.clear();
}
}
void EmbedderUserScriptLoader::OnEmbedderURLFetchComplete() {
base::ThreadPool::PostTask(
FROM_HERE, {base::MayBlock()},
base::BindOnce(&SerializeOnBlockingTask,
base::SequencedTaskRunner::GetCurrentDefault(),
std::move(user_scripts_cache_),
std::move(scripts_loaded_callback_)));
}
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