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// Copyright 2015 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/browser/web_ui_user_script_loader.h"
#include <utility>
#include "base/bind.h"
#include "base/strings/string_util.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_process_host.h"
#include "extensions/browser/guest_view/web_view/web_ui/web_ui_url_fetcher.h"
namespace {
void SerializeOnFileThread(
scoped_ptr<extensions::UserScriptList> user_scripts,
extensions::UserScriptLoader::LoadScriptsCallback callback) {
scoped_ptr<base::SharedMemory> memory =
extensions::UserScriptLoader::Serialize(*user_scripts);
content::BrowserThread::PostTask(
content::BrowserThread::UI, FROM_HERE,
base::Bind(callback, base::Passed(&user_scripts), base::Passed(&memory)));
}
} // namespace
struct WebUIUserScriptLoader::UserScriptRenderInfo {
int render_process_id;
int render_view_id;
UserScriptRenderInfo() : render_process_id(-1), render_view_id(-1) {}
UserScriptRenderInfo(int render_process_id, int render_view_id)
: render_process_id(render_process_id), render_view_id(render_view_id) {}
};
WebUIUserScriptLoader::WebUIUserScriptLoader(
content::BrowserContext* browser_context,
const HostID& host_id)
: UserScriptLoader(browser_context, host_id), complete_fetchers_(0) {
SetReady(true);
}
WebUIUserScriptLoader::~WebUIUserScriptLoader() {
}
void WebUIUserScriptLoader::AddScripts(
const std::set<extensions::UserScript>& scripts,
int render_process_id,
int render_view_id) {
UserScriptRenderInfo info(render_process_id, render_view_id);
for (const extensions::UserScript& script : scripts) {
script_render_info_map_.insert(
std::pair<int, UserScriptRenderInfo>(script.id(), info));
}
extensions::UserScriptLoader::AddScripts(scripts);
}
void WebUIUserScriptLoader::LoadScripts(
scoped_ptr<extensions::UserScriptList> user_scripts,
const std::set<HostID>& changed_hosts,
const std::set<int>& added_script_ids,
LoadScriptsCallback callback) {
user_scripts_cache_.swap(user_scripts);
scripts_loaded_callback_ = 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 theis number. Once we get the total number, start each
// fetch tasks.
DCHECK_EQ(0u, complete_fetchers_);
for (extensions::UserScript& script : *user_scripts_cache_) {
if (added_script_ids.count(script.id()) == 0)
continue;
auto iter = script_render_info_map_.find(script.id());
DCHECK(iter != script_render_info_map_.end());
int render_process_id = iter->second.render_process_id;
int render_view_id = iter->second.render_view_id;
content::BrowserContext* browser_context =
content::RenderProcessHost::FromID(render_process_id)
->GetBrowserContext();
CreateWebUIURLFetchers(&script.js_scripts(), browser_context,
render_process_id, render_view_id);
CreateWebUIURLFetchers(&script.css_scripts(), browser_context,
render_process_id, render_view_id);
script_render_info_map_.erase(script.id());
}
// If no fetch is needed, call OnWebUIURLFetchComplete directly.
if (fetchers_.empty()) {
OnWebUIURLFetchComplete();
return;
}
for (const auto& fetcher : fetchers_)
fetcher->Start();
}
void WebUIUserScriptLoader::CreateWebUIURLFetchers(
extensions::UserScript::FileList* script_files,
content::BrowserContext* browser_context,
int render_process_id,
int render_view_id) {
for (extensions::UserScript::File& file : *script_files) {
if (file.GetContent().empty()) {
// The WebUIUserScriptLoader owns these WebUIURLFetchers. Once the
// loader is destroyed, all the fetchers will be destroyed. Therefore,
// we are sure it is safe to use base::Unretained(this) here.
scoped_ptr<WebUIURLFetcher> fetcher(new WebUIURLFetcher(
browser_context, render_process_id, render_view_id, file.url(),
base::Bind(&WebUIUserScriptLoader::OnSingleWebUIURLFetchComplete,
base::Unretained(this), &file)));
fetchers_.push_back(std::move(fetcher));
}
}
}
void WebUIUserScriptLoader::OnSingleWebUIURLFetchComplete(
extensions::UserScript::File* script_file,
bool success,
const std::string& data) {
if (success) {
// Remove BOM from the content.
std::string::size_type index = data.find(base::kUtf8ByteOrderMark);
if (index == 0)
script_file->set_content(data.substr(strlen(base::kUtf8ByteOrderMark)));
else
script_file->set_content(data);
}
++complete_fetchers_;
if (complete_fetchers_ == fetchers_.size()) {
complete_fetchers_ = 0;
OnWebUIURLFetchComplete();
fetchers_.clear();
}
}
void WebUIUserScriptLoader::OnWebUIURLFetchComplete() {
content::BrowserThread::PostTask(
content::BrowserThread::FILE, FROM_HERE,
base::Bind(&SerializeOnFileThread, base::Passed(&user_scripts_cache_),
scripts_loaded_callback_));
scripts_loaded_callback_.Reset();
}
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