extensions/renderer/script_context.h

   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 #ifndef EXTENSIONS_RENDERER_SCRIPT_CONTEXT_H_
   6 #define EXTENSIONS_RENDERER_SCRIPT_CONTEXT_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "extensions/common/features/feature.h"
  13 #include "extensions/renderer/module_system.h"
  14 #include "extensions/renderer/request_sender.h"
  15 #include "extensions/renderer/safe_builtins.h"
  16 #include "extensions/renderer/scoped_persistent.h"
  17 #include "gin/runner.h"
  18 #include "v8/include/v8.h"
  19
  20 namespace blink {
  21 class WebFrame;
  22 }
  23
  24 namespace content {
  25 class RenderFrame;
  26 class RenderView;
  27 }
  28
  29 namespace extensions {
  30 class Extension;
  31
  32 // Extensions wrapper for a v8 context.
  33 class ScriptContext : public RequestSender::Source, public gin::Runner {
  34  public:
  35   ScriptContext(const v8::Handle<v8::Context>& context,
  36                 blink::WebFrame* frame,
  37                 const Extension* extension,
  38                 Feature::Context context_type);
  39   virtual ~ScriptContext();
  40
  41   // Clears the WebFrame for this contexts and invalidates the associated
  42   // ModuleSystem.
  43   void Invalidate();
  44
  45   // Returns true if this context is still valid, false if it isn't.
  46   // A context becomes invalid via Invalidate().
  47   bool is_valid() const { return !v8_context_.IsEmpty(); }
  48
  49   v8::Handle<v8::Context> v8_context() const {
  50     return v8_context_.NewHandle(isolate());
  51   }
  52
  53   const Extension* extension() const { return extension_.get(); }
  54
  55   blink::WebFrame* web_frame() const { return web_frame_; }
  56
  57   Feature::Context context_type() const { return context_type_; }
  58
  59   void set_module_system(scoped_ptr<ModuleSystem> module_system) {
  60     module_system_ = module_system.Pass();
  61   }
  62
  63   ModuleSystem* module_system() { return module_system_.get(); }
  64
  65   SafeBuiltins* safe_builtins() { return &safe_builtins_; }
  66
  67   const SafeBuiltins* safe_builtins() const { return &safe_builtins_; }
  68
  69   // Returns the ID of the extension associated with this context, or empty
  70   // string if there is no such extension.
  71   const std::string& GetExtensionID() const;
  72
  73   // Returns the RenderView associated with this context. Can return NULL if the
  74   // context is in the process of being destroyed.
  75   content::RenderView* GetRenderView() const;
  76
  77   // Returns the RenderFrame associated with this context. Can return NULL if
  78   // the context is in the process of being destroyed.
  79   content::RenderFrame* GetRenderFrame() const;
  80
  81   // Runs |function| with appropriate scopes. Doesn't catch exceptions, callers
  82   // must do that if they want.
  83   //
  84   // USE THIS METHOD RATHER THAN v8::Function::Call WHEREVER POSSIBLE.
  85   v8::Local<v8::Value> CallFunction(v8::Handle<v8::Function> function,
  86                                     int argc,
  87                                     v8::Handle<v8::Value> argv[]) const;
  88
  89   void DispatchEvent(const char* event_name, v8::Handle<v8::Array> args) const;
  90
  91   // Fires the onunload event on the unload_event module.
  92   void DispatchOnUnloadEvent();
  93
  94   // Returns the availability of the API |api_name|.
  95   Feature::Availability GetAvailability(const std::string& api_name);
  96
  97   // Returns a string description of the type of context this is.
  98   std::string GetContextTypeDescription();
  99
 100   v8::Isolate* isolate() const { return isolate_; }
 101
 102   // Get the URL of this context's web frame.
 103   GURL GetURL() const;
 104
 105   // Returns whether the API |api| or any part of the API could be
 106   // available in this context without taking into account the context's
 107   // extension.
 108   bool IsAnyFeatureAvailableToContext(const extensions::Feature& api);
 109
 110   // Utility to get the URL we will match against for a frame. If the frame has
 111   // committed, this is the commited URL. Otherwise it is the provisional URL.
 112   // The returned URL may be invalid.
 113   static GURL GetDataSourceURLForFrame(const blink::WebFrame* frame);
 114
 115   // Returns the first non-about:-URL in the document hierarchy above and
 116   // including |frame|. The document hierarchy is only traversed if
 117   // |document_url| is an about:-URL and if |match_about_blank| is true.
 118   static GURL GetEffectiveDocumentURL(const blink::WebFrame* frame,
 119                                       const GURL& document_url,
 120                                       bool match_about_blank);
 121
 122   // RequestSender::Source implementation.
 123   virtual ScriptContext* GetContext() OVERRIDE;
 124   virtual void OnResponseReceived(const std::string& name,
 125                                   int request_id,
 126                                   bool success,
 127                                   const base::ListValue& response,
 128                                   const std::string& error) OVERRIDE;
 129
 130   // gin::Runner overrides.
 131   virtual void Run(const std::string& source,
 132                    const std::string& resource_name) OVERRIDE;
 133   virtual v8::Handle<v8::Value> Call(v8::Handle<v8::Function> function,
 134                                      v8::Handle<v8::Value> receiver,
 135                                      int argc,
 136                                      v8::Handle<v8::Value> argv[]) OVERRIDE;
 137   virtual gin::ContextHolder* GetContextHolder() OVERRIDE;
 138
 139  protected:
 140   // The v8 context the bindings are accessible to.
 141   ScopedPersistent<v8::Context> v8_context_;
 142
 143  private:
 144   // The WebFrame associated with this context. This can be NULL because this
 145   // object can outlive is destroyed asynchronously.
 146   blink::WebFrame* web_frame_;
 147
 148   // The extension associated with this context, or NULL if there is none. This
 149   // might be a hosted app in the case that this context is hosting a web URL.
 150   scoped_refptr<const Extension> extension_;
 151
 152   // The type of context.
 153   Feature::Context context_type_;
 154
 155   // Owns and structures the JS that is injected to set up extension bindings.
 156   scoped_ptr<ModuleSystem> module_system_;
 157
 158   // Contains safe copies of builtin objects like Function.prototype.
 159   SafeBuiltins safe_builtins_;
 160
 161   v8::Isolate* isolate_;
 162
 163   DISALLOW_COPY_AND_ASSIGN(ScriptContext);
 164 };
 165
 166 }  // namespace extensions
 167
 168 #endif  // EXTENSIONS_RENDERER_SCRIPT_CONTEXT_H_