extensions/renderer/user_script_set.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/renderer/user_script_set.h"
   6
   7 #include "content/public/common/url_constants.h"
   8 #include "content/public/renderer/render_thread.h"
   9 #include "extensions/common/extension.h"
  10 #include "extensions/common/extension_messages.h"
  11 #include "extensions/common/extension_set.h"
  12 #include "extensions/common/permissions/permissions_data.h"
  13 #include "extensions/renderer/extensions_renderer_client.h"
  14 #include "extensions/renderer/script_context.h"
  15 #include "extensions/renderer/script_injection.h"
  16 #include "extensions/renderer/user_script_injector.h"
  17 #include "third_party/WebKit/public/web/WebDocument.h"
  18 #include "third_party/WebKit/public/web/WebFrame.h"
  19 #include "url/gurl.h"
  20
  21 namespace extensions {
  22
  23 namespace {
  24
  25 GURL GetDocumentUrlForFrame(blink::WebFrame* frame) {
  26   GURL data_source_url = ScriptContext::GetDataSourceURLForFrame(frame);
  27   if (!data_source_url.is_empty() && frame->isViewSourceModeEnabled()) {
  28     data_source_url = GURL(content::kViewSourceScheme + std::string(":") +
  29                            data_source_url.spec());
  30   }
  31
  32   return data_source_url;
  33 }
  34
  35 }  // namespace
  36
  37 UserScriptSet::UserScriptSet(const ExtensionSet* extensions)
  38     : extensions_(extensions) {
  39 }
  40
  41 UserScriptSet::~UserScriptSet() {
  42 }
  43
  44 void UserScriptSet::AddObserver(Observer* observer) {
  45   observers_.AddObserver(observer);
  46 }
  47
  48 void UserScriptSet::RemoveObserver(Observer* observer) {
  49   observers_.RemoveObserver(observer);
  50 }
  51
  52 void UserScriptSet::GetActiveExtensionIds(
  53     std::set<std::string>* ids) const {
  54   for (ScopedVector<UserScript>::const_iterator iter = scripts_.begin();
  55        iter != scripts_.end();
  56        ++iter) {
  57     DCHECK(!(*iter)->extension_id().empty());
  58     ids->insert((*iter)->extension_id());
  59   }
  60 }
  61
  62 void UserScriptSet::GetInjections(
  63     ScopedVector<ScriptInjection>* injections,
  64     blink::WebFrame* web_frame,
  65     int tab_id,
  66     UserScript::RunLocation run_location) {
  67   GURL document_url = GetDocumentUrlForFrame(web_frame);
  68   for (ScopedVector<UserScript>::const_iterator iter = scripts_.begin();
  69        iter != scripts_.end();
  70        ++iter) {
  71     const Extension* extension = extensions_->GetByID((*iter)->extension_id());
  72     if (!extension)
  73       continue;
  74     scoped_ptr<ScriptInjection> injection = GetInjectionForScript(
  75         *iter,
  76         web_frame,
  77         tab_id,
  78         run_location,
  79         document_url,
  80         extension,
  81         false /* is_declarative */);
  82     if (injection.get())
  83       injections->push_back(injection.release());
  84   }
  85 }
  86
  87 bool UserScriptSet::UpdateUserScripts(
  88     base::SharedMemoryHandle shared_memory,
  89     const std::set<std::string>& changed_extensions) {
  90   bool only_inject_incognito =
  91       ExtensionsRendererClient::Get()->IsIncognitoProcess();
  92
  93   // Create the shared memory object (read only).
  94   shared_memory_.reset(new base::SharedMemory(shared_memory, true));
  95   if (!shared_memory_.get())
  96     return false;
  97
  98   // First get the size of the memory block.
  99   if (!shared_memory_->Map(sizeof(Pickle::Header)))
 100     return false;
 101   Pickle::Header* pickle_header =
 102       reinterpret_cast<Pickle::Header*>(shared_memory_->memory());
 103
 104   // Now map in the rest of the block.
 105   int pickle_size = sizeof(Pickle::Header) + pickle_header->payload_size;
 106   shared_memory_->Unmap();
 107   if (!shared_memory_->Map(pickle_size))
 108     return false;
 109
 110   // Unpickle scripts.
 111   uint64 num_scripts = 0;
 112   Pickle pickle(reinterpret_cast<char*>(shared_memory_->memory()), pickle_size);
 113   PickleIterator iter(pickle);
 114   CHECK(pickle.ReadUInt64(&iter, &num_scripts));
 115
 116   scripts_.clear();
 117   scripts_.reserve(num_scripts);
 118   for (uint64 i = 0; i < num_scripts; ++i) {
 119     scoped_ptr<UserScript> script(new UserScript());
 120     script->Unpickle(pickle, &iter);
 121
 122     // Note that this is a pointer into shared memory. We don't own it. It gets
 123     // cleared up when the last renderer or browser process drops their
 124     // reference to the shared memory.
 125     for (size_t j = 0; j < script->js_scripts().size(); ++j) {
 126       const char* body = NULL;
 127       int body_length = 0;
 128       CHECK(pickle.ReadData(&iter, &body, &body_length));
 129       script->js_scripts()[j].set_external_content(
 130           base::StringPiece(body, body_length));
 131     }
 132     for (size_t j = 0; j < script->css_scripts().size(); ++j) {
 133       const char* body = NULL;
 134       int body_length = 0;
 135       CHECK(pickle.ReadData(&iter, &body, &body_length));
 136       script->css_scripts()[j].set_external_content(
 137           base::StringPiece(body, body_length));
 138     }
 139
 140     if (only_inject_incognito && !script->is_incognito_enabled())
 141       continue;  // This script shouldn't run in an incognito tab.
 142
 143     scripts_.push_back(script.release());
 144   }
 145
 146   FOR_EACH_OBSERVER(Observer,
 147                     observers_,
 148                     OnUserScriptsUpdated(changed_extensions, scripts_.get()));
 149   return true;
 150 }
 151
 152 scoped_ptr<ScriptInjection> UserScriptSet::GetDeclarativeScriptInjection(
 153     int script_id,
 154     blink::WebFrame* web_frame,
 155     int tab_id,
 156     UserScript::RunLocation run_location,
 157     const GURL& document_url,
 158     const Extension* extension) {
 159   for (ScopedVector<UserScript>::const_iterator it = scripts_.begin();
 160        it != scripts_.end();
 161        ++it) {
 162     if ((*it)->id() == script_id) {
 163       return GetInjectionForScript(*it,
 164                                    web_frame,
 165                                    tab_id,
 166                                    run_location,
 167                                    document_url,
 168                                    extension,
 169                                    true /* is_declarative */);
 170     }
 171   }
 172   return scoped_ptr<ScriptInjection>();
 173 }
 174
 175 scoped_ptr<ScriptInjection> UserScriptSet::GetInjectionForScript(
 176     UserScript* script,
 177     blink::WebFrame* web_frame,
 178     int tab_id,
 179     UserScript::RunLocation run_location,
 180     const GURL& document_url,
 181     const Extension* extension,
 182     bool is_declarative) {
 183   scoped_ptr<ScriptInjection> injection;
 184   if (web_frame->parent() && !script->match_all_frames())
 185     return injection.Pass();  // Only match subframes if the script declared it.
 186
 187   GURL effective_document_url = ScriptContext::GetEffectiveDocumentURL(
 188       web_frame, document_url, script->match_about_blank());
 189
 190   if (!script->MatchesURL(effective_document_url))
 191     return injection.Pass();
 192
 193   scoped_ptr<ScriptInjector> injector(new UserScriptInjector(script,
 194                                                              this,
 195                                                              is_declarative));
 196   if (injector->CanExecuteOnFrame(
 197           extension,
 198           web_frame,
 199           -1,  // Content scripts are not tab-specific.
 200           web_frame->top()->document().url()) ==
 201       PermissionsData::ACCESS_DENIED) {
 202     return injection.Pass();
 203   }
 204
 205   bool inject_css = !script->css_scripts().empty() &&
 206                     run_location == UserScript::DOCUMENT_START;
 207   bool inject_js =
 208       !script->js_scripts().empty() && script->run_location() == run_location;
 209   if (inject_css || inject_js) {
 210     injection.reset(new ScriptInjection(
 211         injector.Pass(),
 212         web_frame,
 213         extension->id(),
 214         run_location,
 215         tab_id));
 216   }
 217   return injection.Pass();
 218 }
 219
 220 }  // namespace extensions