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      1 // Copyright (c) 2012 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 "chrome/renderer/extensions/chrome_v8_context_set.h"
      6 
      7 #include "base/logging.h"
      8 #include "base/message_loop/message_loop.h"
      9 #include "base/tracked_objects.h"
     10 #include "base/values.h"
     11 #include "chrome/common/extensions/extension.h"
     12 #include "chrome/common/url_constants.h"
     13 #include "chrome/renderer/extensions/chrome_v8_context.h"
     14 #include "content/public/renderer/render_thread.h"
     15 #include "content/public/renderer/render_view.h"
     16 #include "extensions/common/constants.h"
     17 #include "third_party/WebKit/public/platform/WebURL.h"
     18 #include "third_party/WebKit/public/platform/WebURLRequest.h"
     19 #include "third_party/WebKit/public/web/WebDocument.h"
     20 #include "third_party/WebKit/public/web/WebFrame.h"
     21 #include "third_party/WebKit/public/web/WebView.h"
     22 #include "v8/include/v8.h"
     23 
     24 using content::RenderThread;
     25 
     26 namespace extensions {
     27 
     28 ChromeV8ContextSet::ChromeV8ContextSet() {
     29 }
     30 ChromeV8ContextSet::~ChromeV8ContextSet() {
     31 }
     32 
     33 int ChromeV8ContextSet::size() const {
     34   return static_cast<int>(contexts_.size());
     35 }
     36 
     37 void ChromeV8ContextSet::Add(ChromeV8Context* context) {
     38   if (DCHECK_IS_ON()) {
     39     // It's OK to insert the same context twice, but we should only ever have
     40     // one ChromeV8Context per v8::Context.
     41     for (ContextSet::iterator iter = contexts_.begin(); iter != contexts_.end();
     42         ++iter) {
     43       ChromeV8Context* candidate = *iter;
     44       if (candidate != context)
     45         DCHECK(candidate->v8_context() != context->v8_context());
     46     }
     47   }
     48   contexts_.insert(context);
     49 }
     50 
     51 void ChromeV8ContextSet::Remove(ChromeV8Context* context) {
     52   if (contexts_.erase(context)) {
     53     context->Invalidate();
     54     base::MessageLoop::current()->DeleteSoon(FROM_HERE, context);
     55   }
     56 }
     57 
     58 ChromeV8ContextSet::ContextSet ChromeV8ContextSet::GetAll() const {
     59   return contexts_;
     60 }
     61 
     62 ChromeV8Context* ChromeV8ContextSet::GetCurrent() const {
     63   return v8::Context::InContext() ?
     64       GetByV8Context(v8::Context::GetCurrent()) : NULL;
     65 }
     66 
     67 ChromeV8Context* ChromeV8ContextSet::GetCalling() const {
     68   v8::Local<v8::Context> calling = v8::Context::GetCalling();
     69   return calling.IsEmpty() ? NULL : GetByV8Context(calling);
     70 }
     71 
     72 ChromeV8Context* ChromeV8ContextSet::GetByV8Context(
     73     v8::Handle<v8::Context> v8_context) const {
     74   for (ContextSet::const_iterator iter = contexts_.begin();
     75        iter != contexts_.end(); ++iter) {
     76     if ((*iter)->v8_context() == v8_context)
     77       return *iter;
     78   }
     79 
     80   return NULL;
     81 }
     82 
     83 void ChromeV8ContextSet::ForEach(
     84     const std::string& extension_id,
     85     content::RenderView* render_view,
     86     const base::Callback<void(ChromeV8Context*)>& callback) const {
     87   // We copy the context list, because calling into javascript may modify it
     88   // out from under us.
     89   ContextSet contexts = GetAll();
     90 
     91   for (ContextSet::iterator it = contexts.begin(); it != contexts.end();
     92        ++it) {
     93     ChromeV8Context* context = *it;
     94 
     95     // For the same reason as above, contexts may become invalid while we run.
     96     if (!context->is_valid())
     97       continue;
     98 
     99     if (!extension_id.empty()) {
    100       const Extension* extension = context->extension();
    101       if (!extension || (extension_id != extension->id()))
    102         continue;
    103     }
    104 
    105     content::RenderView* context_render_view = context->GetRenderView();
    106     if (!context_render_view)
    107       continue;
    108 
    109     if (render_view && render_view != context_render_view)
    110       continue;
    111 
    112     callback.Run(context);
    113   }
    114 }
    115 
    116 ChromeV8ContextSet::ContextSet ChromeV8ContextSet::OnExtensionUnloaded(
    117     const std::string& extension_id) {
    118   ContextSet contexts = GetAll();
    119   ContextSet removed;
    120 
    121   // Clean up contexts belonging to the unloaded extension. This is done so
    122   // that content scripts (which remain injected into the page) don't continue
    123   // receiving events and sending messages.
    124   for (ContextSet::iterator it = contexts.begin(); it != contexts.end();
    125        ++it) {
    126     if ((*it)->extension() && (*it)->extension()->id() == extension_id) {
    127       (*it)->DispatchOnUnloadEvent();
    128       removed.insert(*it);
    129       Remove(*it);
    130     }
    131   }
    132 
    133   return removed;
    134 }
    135 
    136 }  // namespace extensions
    137