src/extensions/browser/script_executor.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/browser/script_executor.h"
   6
   7 #include "base/bind.h"
   8 #include "base/callback.h"
   9 #include "base/logging.h"
  10 #include "base/pickle.h"
  11 #include "content/public/browser/render_view_host.h"
  12 #include "content/public/browser/web_contents.h"
  13 #include "content/public/browser/web_contents_observer.h"
  14 #include "extensions/browser/extension_registry.h"
  15 #include "extensions/browser/script_execution_observer.h"
  16 #include "extensions/common/extension_messages.h"
  17 #include "ipc/ipc_message.h"
  18 #include "ipc/ipc_message_macros.h"
  19
  20 namespace base {
  21 class ListValue;
  22 }  // namespace base
  23
  24 namespace extensions {
  25
  26 namespace {
  27
  28 const char* kRendererDestroyed = "The tab was closed.";
  29
  30 // A handler for a single injection request. On creation this will send the
  31 // injection request to the renderer, and it will be destroyed after either the
  32 // corresponding response comes from the renderer, or the renderer is destroyed.
  33 class Handler : public content::WebContentsObserver {
  34  public:
  35   Handler(ObserverList<ScriptExecutionObserver>* script_observers,
  36           content::WebContents* web_contents,
  37           const ExtensionMsg_ExecuteCode_Params& params,
  38           const ScriptExecutor::ExecuteScriptCallback& callback)
  39       : content::WebContentsObserver(web_contents),
  40         script_observers_(AsWeakPtr(script_observers)),
  41         extension_id_(params.extension_id),
  42         request_id_(params.request_id),
  43         callback_(callback) {
  44     content::RenderViewHost* rvh = web_contents->GetRenderViewHost();
  45     rvh->Send(new ExtensionMsg_ExecuteCode(rvh->GetRoutingID(), params));
  46   }
  47
  48   virtual ~Handler() {}
  49
  50   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
  51     // Unpack by hand to check the request_id, since there may be multiple
  52     // requests in flight but only one is for this.
  53     if (message.type() != ExtensionHostMsg_ExecuteCodeFinished::ID)
  54       return false;
  55
  56     int message_request_id;
  57     PickleIterator iter(message);
  58     CHECK(message.ReadInt(&iter, &message_request_id));
  59
  60     if (message_request_id != request_id_)
  61       return false;
  62
  63     IPC_BEGIN_MESSAGE_MAP(Handler, message)
  64       IPC_MESSAGE_HANDLER(ExtensionHostMsg_ExecuteCodeFinished,
  65                           OnExecuteCodeFinished)
  66     IPC_END_MESSAGE_MAP()
  67     return true;
  68   }
  69
  70   virtual void WebContentsDestroyed() OVERRIDE {
  71     base::ListValue val;
  72     callback_.Run(kRendererDestroyed, GURL(std::string()), val);
  73     delete this;
  74   }
  75
  76  private:
  77   void OnExecuteCodeFinished(int request_id,
  78                              const std::string& error,
  79                              const GURL& on_url,
  80                              const base::ListValue& script_result) {
  81     if (script_observers_.get() && error.empty()) {
  82       ScriptExecutionObserver::ExecutingScriptsMap id_map;
  83       id_map[extension_id_] = std::set<std::string>();
  84       FOR_EACH_OBSERVER(ScriptExecutionObserver,
  85                         *script_observers_,
  86                         OnScriptsExecuted(web_contents(), id_map, on_url));
  87     }
  88
  89     callback_.Run(error, on_url, script_result);
  90     delete this;
  91   }
  92
  93   base::WeakPtr<ObserverList<ScriptExecutionObserver> > script_observers_;
  94   std::string extension_id_;
  95   int request_id_;
  96   ScriptExecutor::ExecuteScriptCallback callback_;
  97 };
  98
  99 }  // namespace
 100
 101 ScriptExecutionObserver::~ScriptExecutionObserver() {
 102 }
 103
 104 ScriptExecutor::ScriptExecutor(
 105     content::WebContents* web_contents,
 106     ObserverList<ScriptExecutionObserver>* script_observers)
 107     : next_request_id_(0),
 108       web_contents_(web_contents),
 109       script_observers_(script_observers) {
 110   CHECK(web_contents_);
 111 }
 112
 113 ScriptExecutor::~ScriptExecutor() {
 114 }
 115
 116 void ScriptExecutor::ExecuteScript(const std::string& extension_id,
 117                                    ScriptExecutor::ScriptType script_type,
 118                                    const std::string& code,
 119                                    ScriptExecutor::FrameScope frame_scope,
 120                                    ScriptExecutor::MatchAboutBlank about_blank,
 121                                    UserScript::RunLocation run_at,
 122                                    ScriptExecutor::WorldType world_type,
 123                                    ScriptExecutor::ProcessType process_type,
 124                                    const GURL& webview_src,
 125                                    const GURL& file_url,
 126                                    bool user_gesture,
 127                                    ScriptExecutor::ResultType result_type,
 128                                    const ExecuteScriptCallback& callback) {
 129   // Don't execute if the extension has been unloaded.
 130   const Extension* extension =
 131       ExtensionRegistry::Get(web_contents_->GetBrowserContext())
 132           ->enabled_extensions().GetByID(extension_id);
 133   if (!extension)
 134     return;
 135
 136   ExtensionMsg_ExecuteCode_Params params;
 137   params.request_id = next_request_id_++;
 138   params.extension_id = extension_id;
 139   params.is_javascript = (script_type == JAVASCRIPT);
 140   params.code = code;
 141   params.all_frames = (frame_scope == ALL_FRAMES);
 142   params.match_about_blank = (about_blank == MATCH_ABOUT_BLANK);
 143   params.run_at = static_cast<int>(run_at);
 144   params.in_main_world = (world_type == MAIN_WORLD);
 145   params.is_web_view = (process_type == WEB_VIEW_PROCESS);
 146   params.webview_src = webview_src;
 147   params.file_url = file_url;
 148   params.wants_result = (result_type == JSON_SERIALIZED_RESULT);
 149   params.user_gesture = user_gesture;
 150
 151   // Handler handles IPCs and deletes itself on completion.
 152   new Handler(script_observers_, web_contents_, params, callback);
 153 }
 154
 155 }  // namespace extensions