blob: becf706119fa427805b32a2a9dfc9a21ae4d7528 [file] [log] [blame]
// 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 "content/browser/plugin_list.h"
#include <stddef.h>
#include <algorithm>
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/sys_string_conversions.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "content/public/common/content_switches.h"
#include "net/base/mime_util.h"
#include "url/gurl.h"
namespace content {
namespace {
base::LazyInstance<PluginList>::DestructorAtExit g_singleton =
LAZY_INSTANCE_INITIALIZER;
// Returns true if the plugin supports |mime_type|. |mime_type| should be all
// lower case.
bool SupportsType(const WebPluginInfo& plugin,
const std::string& mime_type,
bool allow_wildcard) {
// Webkit will ask for a plugin to handle empty mime types.
if (mime_type.empty())
return false;
for (const WebPluginMimeType& mime_info : plugin.mime_types) {
if (net::MatchesMimeType(mime_info.mime_type, mime_type)) {
if (allow_wildcard || mime_info.mime_type != "*")
return true;
}
}
return false;
}
// Returns true if the given plugin supports a given file extension.
// |extension| should be all lower case. |actual_mime_type| will be set to the
// MIME type if found. The MIME type which corresponds to the extension is
// optionally returned back.
bool SupportsExtension(const WebPluginInfo& plugin,
const std::string& extension,
std::string* actual_mime_type) {
for (const WebPluginMimeType& mime_type : plugin.mime_types) {
for (const std::string& file_extension : mime_type.file_extensions) {
if (file_extension == extension) {
*actual_mime_type = mime_type.mime_type;
return true;
}
}
}
return false;
}
} // namespace
// static
PluginList* PluginList::Singleton() {
return g_singleton.Pointer();
}
void PluginList::RefreshPlugins() {
base::AutoLock lock(lock_);
loading_state_ = LOADING_STATE_NEEDS_REFRESH;
}
void PluginList::RegisterInternalPlugin(const WebPluginInfo& info,
bool add_at_beginning) {
base::AutoLock lock(lock_);
internal_plugins_.push_back(info);
if (add_at_beginning) {
// Newer registrations go earlier in the list so they can override the MIME
// types of older registrations.
extra_plugin_paths_.insert(extra_plugin_paths_.begin(), info.path);
} else {
extra_plugin_paths_.push_back(info.path);
}
}
void PluginList::UnregisterInternalPlugin(const base::FilePath& path) {
base::AutoLock lock(lock_);
bool found = false;
for (size_t i = 0; i < internal_plugins_.size(); i++) {
if (internal_plugins_[i].path == path) {
internal_plugins_.erase(internal_plugins_.begin() + i);
found = true;
break;
}
}
DCHECK(found);
RemoveExtraPluginPathLocked(path);
}
void PluginList::GetInternalPlugins(
std::vector<WebPluginInfo>* internal_plugins) {
base::AutoLock lock(lock_);
for (const auto& plugin : internal_plugins_)
internal_plugins->push_back(plugin);
}
bool PluginList::ReadPluginInfo(const base::FilePath& filename,
WebPluginInfo* info) {
base::AutoLock lock(lock_);
for (const auto& plugin : internal_plugins_) {
if (filename == plugin.path) {
*info = plugin;
return true;
}
}
return false;
}
PluginList::PluginList() : loading_state_(LOADING_STATE_NEEDS_REFRESH) {}
bool PluginList::PrepareForPluginLoading() {
base::AutoLock lock(lock_);
if (loading_state_ == LOADING_STATE_UP_TO_DATE)
return false;
loading_state_ = LOADING_STATE_REFRESHING;
return true;
}
void PluginList::LoadPlugins() {
if (!PrepareForPluginLoading())
return;
std::vector<WebPluginInfo> new_plugins;
base::OnceClosure will_load_callback;
{
base::AutoLock lock(lock_);
will_load_callback = will_load_plugins_callback_;
}
if (will_load_callback)
std::move(will_load_callback).Run();
std::vector<base::FilePath> plugin_paths;
GetPluginPathsToLoad(&plugin_paths);
for (const base::FilePath& path : plugin_paths) {
WebPluginInfo plugin_info;
LoadPluginIntoPluginList(path, &new_plugins, &plugin_info);
}
SetPlugins(new_plugins);
}
bool PluginList::LoadPluginIntoPluginList(const base::FilePath& path,
std::vector<WebPluginInfo>* plugins,
WebPluginInfo* plugin_info) {
if (!ReadPluginInfo(path, plugin_info))
return false;
// TODO(piman): Do we still need this after NPAPI removal?
for (const content::WebPluginMimeType& mime_type : plugin_info->mime_types) {
// TODO: don't load global handlers for now.
// WebKit hands to the Plugin before it tries
// to handle mimeTypes on its own.
if (mime_type.mime_type == "*")
return false;
}
plugins->push_back(*plugin_info);
return true;
}
void PluginList::GetPluginPathsToLoad(
std::vector<base::FilePath>* plugin_paths) {
// Don't want to hold the lock while loading new plugins, so we don't block
// other methods if they're called on other threads.
std::vector<base::FilePath> extra_plugin_paths;
{
base::AutoLock lock(lock_);
extra_plugin_paths = extra_plugin_paths_;
}
for (const base::FilePath& path : extra_plugin_paths) {
if (base::ContainsValue(*plugin_paths, path))
continue;
plugin_paths->push_back(path);
}
}
void PluginList::SetPlugins(const std::vector<WebPluginInfo>& plugins) {
base::AutoLock lock(lock_);
// If we haven't been invalidated in the mean time, mark the plugin list as
// up to date.
if (loading_state_ != LOADING_STATE_NEEDS_REFRESH)
loading_state_ = LOADING_STATE_UP_TO_DATE;
plugins_list_ = plugins;
}
void PluginList::set_will_load_plugins_callback(
const base::RepeatingClosure& callback) {
base::AutoLock lock(lock_);
will_load_plugins_callback_ = callback;
}
void PluginList::GetPlugins(std::vector<WebPluginInfo>* plugins) {
LoadPlugins();
base::AutoLock lock(lock_);
plugins->insert(plugins->end(), plugins_list_.begin(), plugins_list_.end());
}
bool PluginList::GetPluginsNoRefresh(std::vector<WebPluginInfo>* plugins) {
base::AutoLock lock(lock_);
plugins->insert(plugins->end(), plugins_list_.begin(), plugins_list_.end());
return loading_state_ == LOADING_STATE_UP_TO_DATE;
}
bool PluginList::GetPluginInfoArray(
const GURL& url,
const std::string& mime_type,
bool allow_wildcard,
std::vector<WebPluginInfo>* info,
std::vector<std::string>* actual_mime_types) {
DCHECK(mime_type == base::ToLowerASCII(mime_type));
DCHECK(info);
LoadPlugins();
base::AutoLock lock(lock_);
bool is_stale = loading_state_ != LOADING_STATE_UP_TO_DATE;
info->clear();
if (actual_mime_types)
actual_mime_types->clear();
std::set<base::FilePath> visited_plugins;
// Add in plugins by mime type.
for (const WebPluginInfo& plugin : plugins_list_) {
if (SupportsType(plugin, mime_type, allow_wildcard)) {
const base::FilePath& path = plugin.path;
if (visited_plugins.insert(path).second) {
info->push_back(plugin);
if (actual_mime_types)
actual_mime_types->push_back(mime_type);
}
}
}
// Add in plugins by url.
// We do not permit URL-sniff based plugin MIME type overrides aside from
// the case where the "type" was initially missing.
// We collected stats to determine this approach isn't a major compat issue,
// and we defend against content confusion attacks in various cases, such
// as when the user doesn't have the Flash plugin enabled.
std::string path = url.path();
std::string::size_type last_dot = path.rfind('.');
if (last_dot == std::string::npos || !mime_type.empty())
return is_stale;
std::string extension =
base::ToLowerASCII(base::StringPiece(path).substr(last_dot + 1));
std::string actual_mime_type;
for (const WebPluginInfo& plugin : plugins_list_) {
if (SupportsExtension(plugin, extension, &actual_mime_type)) {
base::FilePath plugin_path = plugin.path;
if (visited_plugins.insert(plugin_path).second) {
info->push_back(plugin);
if (actual_mime_types)
actual_mime_types->push_back(actual_mime_type);
}
}
}
return is_stale;
}
void PluginList::RemoveExtraPluginPathLocked(
const base::FilePath& plugin_path) {
lock_.AssertAcquired();
std::vector<base::FilePath>::iterator it = std::find(
extra_plugin_paths_.begin(), extra_plugin_paths_.end(), plugin_path);
if (it != extra_plugin_paths_.end())
extra_plugin_paths_.erase(it);
}
PluginList::~PluginList() = default;
} // namespace content