Declarative content scripts: Browser-side: per-extension shared memory regions (lazily loaded)

chrome/browser/extensions/user_script_master.cc

 // 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 "chrome/browser/extensions/user_script_master.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/memory/shared_memory.h"
 #include "base/version.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/common/extensions/api/i18n/default_locale_handler.h"
 #include "chrome/common/extensions/manifest_handlers/content_scripts_handler.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "extensions/browser/component_extension_resource_manager.h"
 #include "extensions/browser/content_verifier.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/common/file_util.h"
 #include "extensions/common/message_bundle.h"
 #include "ui/base/resource/resource_bundle.h"
 
 using content::BrowserThread;
 using extensions::ExtensionsBrowserClient;
 
 namespace extensions {
 
 namespace {
 
-typedef base::Callback<void(scoped_ptr<UserScriptList>,
-                            scoped_ptr<base::SharedMemory>)>
-                                LoadScriptsCallback;
-
 void VerifyContent(scoped_refptr<ContentVerifier> verifier,
                    const std::string& extension_id,
                    const base::FilePath& extension_root,
                    const base::FilePath& relative_path,
                    const std::string& content) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   scoped_refptr<ContentVerifyJob> job(
       verifier->CreateJobFor(extension_id, extension_root, relative_path));
   if (job.get()) {
     job->Start();
@@ skipping 138 matching lines @@
 
   base::SharedMemoryHandle readonly_handle;
   if (!shared_memory.ShareReadOnlyToProcess(base::GetCurrentProcessHandle(),
                                             &readonly_handle))
     return scoped_ptr<base::SharedMemory>();
 
   return make_scoped_ptr(new base::SharedMemory(readonly_handle,
                                                 /*read_only=*/true));
 }
 
-void LoadScriptsOnFileThread(scoped_ptr<UserScriptList> user_scripts,
-                             const ExtensionsInfo& extensions_info,
-                             const std::set<std::string>& new_extensions,
-                             scoped_refptr<ContentVerifier> verifier,
-                             LoadScriptsCallback callback) {
-  DCHECK(user_scripts.get());
-  LoadUserScripts(
-      user_scripts.get(), extensions_info, new_extensions, verifier);
-  scoped_ptr<base::SharedMemory> memory = Serialize(*user_scripts);
-  BrowserThread::PostTask(
-      BrowserThread::UI,
-      FROM_HERE,
-      base::Bind(callback,
-                 base::Passed(&user_scripts),
-                 base::Passed(&memory)));
-}
-
 // Helper function to parse greasesmonkey headers
 bool GetDeclarationValue(const base::StringPiece& line,
                          const base::StringPiece& prefix,
                          std::string* value) {
   base::StringPiece::size_type index = line.find(prefix);
   if (index == base::StringPiece::npos)
     return false;
 
   std::string temp(line.data() + index + prefix.length(),
                    line.length() - index - prefix.length());
@@ skipping 108 matching lines @@
   std::set<std::string> new_extensions;
   for (UserScriptList::const_iterator iter = user_scripts->begin();
        iter != user_scripts->end();
        ++iter) {
     new_extensions.insert(iter->extension_id());
   }
   LoadUserScripts(
       user_scripts, info, new_extensions, NULL /* no verifier for testing */);
 }
 
+// static
+void UserScriptMaster::LoadScriptsOnFileThread(
+    scoped_ptr<UserScriptList> user_scripts,
+    const ExtensionsInfo& extensions_info,
+    const std::set<std::string>& new_extensions,
+    scoped_refptr<ContentVerifier> verifier,
+    LoadScriptsCallback callback) {
+  DCHECK(user_scripts.get());
+  LoadUserScripts(
+      user_scripts.get(), extensions_info, new_extensions, verifier);
+  scoped_ptr<base::SharedMemory> memory = Serialize(*user_scripts);
+  BrowserThread::PostTask(
+      BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(callback, base::Passed(&user_scripts), base::Passed(&memory)));
+}
+
 UserScriptMaster::UserScriptMaster(Profile* profile)
     : user_scripts_(new UserScriptList()),
       extensions_service_ready_(false),
       pending_load_(false),
       profile_(profile),
-      extension_registry_observer_(this),
       weak_factory_(this) {
-  extension_registry_observer_.Add(ExtensionRegistry::Get(profile_));
-  registrar_.Add(this, chrome::NOTIFICATION_EXTENSIONS_READY,
-                 content::Source<Profile>(profile_));
-  registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CREATED,
-                 content::NotificationService::AllBrowserContextsAndSources());
 }
 
 UserScriptMaster::~UserScriptMaster() {
 }
 
 void UserScriptMaster::OnScriptsLoaded(
     scoped_ptr<UserScriptList> user_scripts,
     scoped_ptr<base::SharedMemory> shared_memory) {
   user_scripts_.reset(user_scripts.release());
   if (pending_load_) {
@@ skipping 27 matching lines @@
                changed_extensions_);
   }
   changed_extensions_.clear();
 
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_USER_SCRIPTS_UPDATED,
       content::Source<Profile>(profile_),
       content::Details<base::SharedMemory>(shared_memory_.get()));
 }
 
-void UserScriptMaster::OnExtensionLoaded(
-    content::BrowserContext* browser_context,
-    const Extension* extension) {
-  added_extensions_.insert(extension->id());
-  removed_extensions_.erase(extension->id());
-  extensions_info_[extension->id()] =
-      ExtensionSet::ExtensionPathAndDefaultLocale(
-          extension->path(), LocaleInfo::GetDefaultLocale(extension));
-  if (extensions_service_ready_) {
-    changed_extensions_.insert(extension->id());
-    if (is_loading())
-      pending_load_ = true;
-    else
-      StartLoad();
-  }
-}
-
-void UserScriptMaster::OnExtensionUnloaded(
-    content::BrowserContext* browser_context,
-    const Extension* extension,
-    UnloadedExtensionInfo::Reason reason) {
-  removed_extensions_.insert(extension->id());
-  added_extensions_.erase(extension->id());
-  // Remove any content scripts.
-  extensions_info_.erase(extension->id());
-  changed_extensions_.insert(extension->id());
-  if (is_loading())
-    pending_load_ = true;
-  else
-    StartLoad();
-}
-
-void UserScriptMaster::Observe(int type,
-                               const content::NotificationSource& source,
-                               const content::NotificationDetails& details) {
-  bool should_start_load = false;
-  switch (type) {
-    case chrome::NOTIFICATION_EXTENSIONS_READY:
-      extensions_service_ready_ = true;
-      should_start_load = true;
-      break;
-    case content::NOTIFICATION_RENDERER_PROCESS_CREATED: {
-      content::RenderProcessHost* process =
-          content::Source<content::RenderProcessHost>(source).ptr();
-      Profile* profile = Profile::FromBrowserContext(
-          process->GetBrowserContext());
-      if (!profile_->IsSameProfile(profile))
-        return;
-      if (ScriptsReady()) {
-        SendUpdate(process,
-                   GetSharedMemory(),
-                   std::set<std::string>());  // Include all extensions.
-      }
-      break;
-    }
-    default:
-      DCHECK(false);
-  }
-
-  if (should_start_load) {
-    if (is_loading())
-      pending_load_ = true;
-    else
-      StartLoad();
-  }
-}
-
-void UserScriptMaster::StartLoad() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  DCHECK(!is_loading());
-
-  // Remove any user scripts belonging to any extension that was updated or
-  // removed.
-  for (UserScriptList::iterator iter = user_scripts_->begin();
-       iter != user_scripts_->end();) {
-    if (removed_extensions_.count(iter->extension_id()) > 0 ||
-        added_extensions_.count(iter->extension_id()) > 0) {
-      iter = user_scripts_->erase(iter);
-    } else {
-      ++iter;
-    }
-  }
-
-  // Add any content scripts for extensions that were recently loaded.
-  const ExtensionSet& enabled_extensions =
-      ExtensionRegistry::Get(profile_)->enabled_extensions();
-  for (std::set<std::string>::const_iterator iter = added_extensions_.begin();
-       iter != added_extensions_.end(); ++iter) {
-    const Extension* extension = enabled_extensions.GetByID(*iter);
-    if (!extension)
-      continue;
-    bool incognito_enabled =
-        util::IsIncognitoEnabled(extension->id(), profile_);
-    const UserScriptList& scripts =
-        ContentScriptsInfo::GetContentScripts(extension);
-    for (UserScriptList::const_iterator script = scripts.begin();
-         script != scripts.end();
-         ++script) {
-      user_scripts_->push_back(*script);
-      user_scripts_->back().set_incognito_enabled(incognito_enabled);
-    }
-  }
-
-  BrowserThread::PostTask(
-      BrowserThread::FILE,
-      FROM_HERE,
-      base::Bind(&LoadScriptsOnFileThread,
-                 base::Passed(&user_scripts_),
-                 extensions_info_,
-                 added_extensions_,
-                 make_scoped_refptr(
-                     ExtensionSystem::Get(profile_)->content_verifier()),
-                 base::Bind(&UserScriptMaster::OnScriptsLoaded,
-                            weak_factory_.GetWeakPtr())));
-  added_extensions_.clear();
-  removed_extensions_.clear();
-  user_scripts_.reset(NULL);
-}
-
 void UserScriptMaster::SendUpdate(
     content::RenderProcessHost* process,
     base::SharedMemory* shared_memory,
     const std::set<std::string>& changed_extensions) {
   // Don't allow injection of content scripts into <webview>.
   if (process->IsIsolatedGuest())
     return;
 
   Profile* profile = Profile::FromBrowserContext(process->GetBrowserContext());
   // Make sure we only send user scripts to processes in our profile.
   if (!profile_->IsSameProfile(profile))
     return;
 
   // If the process is being started asynchronously, early return.  We'll end up
   // calling InitUserScripts when it's created which will call this again.
   base::ProcessHandle handle = process->GetHandle();
   if (!handle)
     return;
 
   base::SharedMemoryHandle handle_for_process;
   if (!shared_memory->ShareToProcess(handle, &handle_for_process))
     return;  // This can legitimately fail if the renderer asserts at startup.
 
   if (base::SharedMemory::IsHandleValid(handle_for_process)) {
     process->Send(new ExtensionMsg_UpdateUserScripts(
-        handle_for_process, "" /* owner */, changed_extensions));
+        handle_for_process, owner_extension_id_, changed_extensions));
   }
 }
 
 }  // namespace extensions