Introduce ScriptInjection in extensions/renderer to inject UserScripts

extensions/renderer/user_script_slave.cc

 // Copyright 2014 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 "extensions/renderer/user_script_slave.h"
 
 #include <map>
 
-#include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/shared_memory.h"
 #include "base/metrics/histogram.h"
 #include "base/pickle.h"
-#include "base/strings/stringprintf.h"
 #include "base/timer/elapsed_timer.h"
-#include "content/public/common/url_constants.h"
 #include "content/public/renderer/render_thread.h"
 #include "content/public/renderer/render_view.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/extension_set.h"
 #include "extensions/common/manifest_handlers/csp_info.h"
 #include "extensions/common/permissions/permissions_data.h"
-#include "extensions/renderer/dom_activity_logger.h"
-#include "extensions/renderer/extension_groups.h"
 #include "extensions/renderer/extensions_renderer_client.h"
 #include "extensions/renderer/script_context.h"
-#include "grit/renderer_resources.h"
-#include "third_party/WebKit/public/platform/WebURLRequest.h"
-#include "third_party/WebKit/public/platform/WebVector.h"
-#include "third_party/WebKit/public/web/WebDocument.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebSecurityOrigin.h"
 #include "third_party/WebKit/public/web/WebSecurityPolicy.h"
 #include "third_party/WebKit/public/web/WebView.h"
-#include "ui/base/resource/resource_bundle.h"
 #include "url/gurl.h"
 
 using blink::WebFrame;
 using blink::WebSecurityOrigin;
 using blink::WebSecurityPolicy;
 using blink::WebString;
-using blink::WebVector;
 using blink::WebView;
 using content::RenderThread;
 
 namespace extensions {
 
-// These two strings are injected before and after the Greasemonkey API and
-// user script to wrap it in an anonymous scope.
-static const char kUserScriptHead[] = "(function (unsafeWindow) {\n";
-static const char kUserScriptTail[] = "\n})(window);";
-
 int UserScriptSlave::GetIsolatedWorldIdForExtension(const Extension* extension,
                                                     WebFrame* frame) {
   static int g_next_isolated_world_id =
       ExtensionsRendererClient::Get()->GetLowestIsolatedWorldId();
 
+  int id = 0;
   IsolatedWorldMap::iterator iter = isolated_world_ids_.find(extension->id());
   if (iter != isolated_world_ids_.end()) {
-    // We need to set the isolated world origin and CSP even if it's not a new
-    // world since these are stored per frame, and we might not have used this
-    // isolated world in this frame before.
-    frame->setIsolatedWorldSecurityOrigin(
-        iter->second, WebSecurityOrigin::create(extension->url()));
-    frame->setIsolatedWorldContentSecurityPolicy(
-        iter->second,
-        WebString::fromUTF8(CSPInfo::GetContentSecurityPolicy(extension)));
-    return iter->second;
+    id = iter->second;
+  } else {
+    id = g_next_isolated_world_id++;
+    // This map will tend to pile up over time, but realistically, you're never
+    // going to have enough extensions for it to matter.
+    isolated_world_ids_[extension->id()] = id;
   }
 
-  int new_id = g_next_isolated_world_id;
-  ++g_next_isolated_world_id;
+  // We need to set the isolated world origin and CSP even if it's not a new
+  // world since these are stored per frame, and we might not have used this
+  // isolated world in this frame before.
+  frame->setIsolatedWorldSecurityOrigin(
+      id, WebSecurityOrigin::create(extension->url()));
+  frame->setIsolatedWorldContentSecurityPolicy(
+      id, WebString::fromUTF8(CSPInfo::GetContentSecurityPolicy(extension)));
 
-  // This map will tend to pile up over time, but realistically, you're never
-  // going to have enough extensions for it to matter.
-  isolated_world_ids_[extension->id()] = new_id;
-  frame->setIsolatedWorldSecurityOrigin(
-      new_id, WebSecurityOrigin::create(extension->url()));
-  frame->setIsolatedWorldContentSecurityPolicy(
-      new_id,
-      WebString::fromUTF8(CSPInfo::GetContentSecurityPolicy(extension)));
-  return new_id;
+  return id;
 }
 
 std::string UserScriptSlave::GetExtensionIdForIsolatedWorld(
     int isolated_world_id) {
   for (IsolatedWorldMap::iterator iter = isolated_world_ids_.begin();
        iter != isolated_world_ids_.end();
        ++iter) {
     if (iter->second == isolated_world_id)
       return iter->first;
   }
   return std::string();
 }
 
 void UserScriptSlave::RemoveIsolatedWorld(const std::string& extension_id) {
   isolated_world_ids_.erase(extension_id);
 }
 
 UserScriptSlave::UserScriptSlave(const ExtensionSet* extensions)
-    : script_deleter_(&scripts_), extensions_(extensions) {
-  api_js_ = ResourceBundle::GetSharedInstance().GetRawDataResource(
-      IDR_GREASEMONKEY_API_JS);
+    : extensions_(extensions) {
 }
 
 UserScriptSlave::~UserScriptSlave() {
 }
 
 void UserScriptSlave::GetActiveExtensions(
     std::set<std::string>* extension_ids) {
-  for (size_t i = 0; i < scripts_.size(); ++i) {
-    DCHECK(!scripts_[i]->extension_id().empty());
-    extension_ids->insert(scripts_[i]->extension_id());
+  DCHECK(extension_ids);
+  for (ScopedVector<ScriptInjection>::const_iterator iter =
+           script_injections_.begin();
+       iter != script_injections_.end();
+       ++iter) {
+    DCHECK(!(*iter)->extension_id().empty());
+    extension_ids->insert((*iter)->extension_id());
   }
 }
 
+const Extension* UserScriptSlave::GetExtension(
+    const std::string& extension_id) {
+  return extensions_->GetByID(extension_id);
+}
+
 bool UserScriptSlave::UpdateScripts(base::SharedMemoryHandle shared_memory) {
-  scripts_.clear();
+  script_injections_.clear();
 
   bool only_inject_incognito =
       ExtensionsRendererClient::Get()->IsIncognitoProcess();
 
   // Create the shared memory object (read only).
   shared_memory_.reset(new base::SharedMemory(shared_memory, true));
   if (!shared_memory_.get())
     return false;
 
   // First get the size of the memory block.
   if (!shared_memory_->Map(sizeof(Pickle::Header)))
     return false;
   Pickle::Header* pickle_header =
       reinterpret_cast<Pickle::Header*>(shared_memory_->memory());
 
   // Now map in the rest of the block.
   int pickle_size = sizeof(Pickle::Header) + pickle_header->payload_size;
   shared_memory_->Unmap();
   if (!shared_memory_->Map(pickle_size))
     return false;
 
   // Unpickle scripts.
   uint64 num_scripts = 0;
   Pickle pickle(reinterpret_cast<char*>(shared_memory_->memory()), pickle_size);
   PickleIterator iter(pickle);
   CHECK(pickle.ReadUInt64(&iter, &num_scripts));
 
-  scripts_.reserve(num_scripts);
+  script_injections_.reserve(num_scripts);
   for (uint64 i = 0; i < num_scripts; ++i) {
-    scripts_.push_back(new UserScript());
-    UserScript* script = scripts_.back();
+    scoped_ptr<UserScript> script(new UserScript());
     script->Unpickle(pickle, &iter);
 
     // Note that this is a pointer into shared memory. We don't own it. It gets
     // cleared up when the last renderer or browser process drops their
     // reference to the shared memory.
     for (size_t j = 0; j < script->js_scripts().size(); ++j) {
       const char* body = NULL;
       int body_length = 0;
       CHECK(pickle.ReadData(&iter, &body, &body_length));
       script->js_scripts()[j].set_external_content(
           base::StringPiece(body, body_length));
     }
     for (size_t j = 0; j < script->css_scripts().size(); ++j) {
       const char* body = NULL;
       int body_length = 0;
       CHECK(pickle.ReadData(&iter, &body, &body_length));
       script->css_scripts()[j].set_external_content(
           base::StringPiece(body, body_length));
     }
 
-    if (only_inject_incognito && !script->is_incognito_enabled()) {
-      // This script shouldn't run in an incognito tab.
-      delete script;
-      scripts_.pop_back();
-    }
+    if (only_inject_incognito && !script->is_incognito_enabled())
+      continue; // This script shouldn't run in an incognito tab.
+
+    script_injections_.push_back(new ScriptInjection(script.Pass(), this));
   }
 
   return true;
 }
 
 void UserScriptSlave::InjectScripts(WebFrame* frame,
                                     UserScript::RunLocation location) {
-  GURL data_source_url = ScriptContext::GetDataSourceURLForFrame(frame);
-  if (data_source_url.is_empty())
+  GURL document_url = ScriptInjection::GetDocumentUrlForFrame(frame);
+  if (document_url.is_empty())
     return;
 
-  if (frame->isViewSourceModeEnabled())
-    data_source_url = GURL(content::kViewSourceScheme + std::string(":") +
-                           data_source_url.spec());
+  content::RenderView* top_render_view =
+      content::RenderView::FromWebView(frame->top()->view());
 
-  base::ElapsedTimer timer;
-  int num_css = 0;
-  int num_scripts = 0;
-
-  ExecutingScriptsMap extensions_executing_scripts;
-
-  blink::WebFrame* top_frame = frame->top();
-  content::RenderView* top_render_view =
-      content::RenderView::FromWebView(top_frame->view());
-
-  for (size_t i = 0; i < scripts_.size(); ++i) {
-    std::vector<WebScriptSource> sources;
-    UserScript* script = scripts_[i];
-
-    if (frame->parent() && !script->match_all_frames())
-      continue;  // Only match subframes if the script declared it wanted to.
-
-    const Extension* extension = extensions_->GetByID(script->extension_id());
-
-    // Since extension info is sent separately from user script info, they can
-    // be out of sync. We just ignore this situation.
-    if (!extension)
+  ScriptInjection::ScriptsRunInfo scripts_run_info;
+  for (ScopedVector<ScriptInjection>::const_iterator iter =
+           script_injections_.begin();
+       iter != script_injections_.end();
+       ++iter) {
+    ScriptInjection* injection = *iter;
+    if (!injection->WantsToRun(frame, location, document_url))
       continue;
 
-    const GURL& document_url = ScriptContext::GetEffectiveDocumentURL(
-        frame, data_source_url, script->match_about_blank());
+    const Extension* extension = GetExtension(injection->extension_id());
+    DCHECK(extension);
 
-    // Content scripts are not tab-specific.
-    const int kNoTabId = -1;
-    // We don't have a process id in this context.
-    const int kNoProcessId = -1;
-    if (!PermissionsData::CanExecuteScriptOnPage(extension,
-                                                 document_url,
-                                                 top_frame->document().url(),
-                                                 kNoTabId,
-                                                 script,
-                                                 kNoProcessId,
-                                                 NULL)) {
-      continue;
+    if (PermissionsData::RequiresActionForScriptExecution(extension)) {
+      // TODO(rdevlin.cronin): Right now, this is just a notification, but soon
+      // we should block without user consent.
+      top_render_view->Send(
+          new ExtensionHostMsg_NotifyExtensionScriptExecution(
+              top_render_view->GetRoutingID(),
+              extension->id(),
+              top_render_view->GetPageId()));
     }
 
-    if (location == UserScript::DOCUMENT_START) {
-      num_css += script->css_scripts().size();
-      for (UserScript::FileList::const_iterator iter =
-               script->css_scripts().begin();
-           iter != script->css_scripts().end();
-           ++iter) {
-        frame->document().insertStyleSheet(
-            WebString::fromUTF8(iter->GetContent().as_string()));
-      }
-    }
-
-    if (script->run_location() == location) {
-      // TODO(rdevlin.cronin): Right now, this is just a notification, but soon
-      // we should block without user consent.
-      if (PermissionsData::RequiresActionForScriptExecution(extension)) {
-        top_render_view->Send(
-            new ExtensionHostMsg_NotifyExtensionScriptExecution(
-                top_render_view->GetRoutingID(),
-                extension->id(),
-                top_render_view->GetPageId()));
-      }
-      num_scripts += script->js_scripts().size();
-      for (size_t j = 0; j < script->js_scripts().size(); ++j) {
-        UserScript::File& file = script->js_scripts()[j];
-        std::string content = file.GetContent().as_string();
-
-        // We add this dumb function wrapper for standalone user script to
-        // emulate what Greasemonkey does.
-        // TODO(aa): I think that maybe "is_standalone" scripts don't exist
-        // anymore. Investigate.
-        if (script->is_standalone() || script->emulate_greasemonkey()) {
-          content.insert(0, kUserScriptHead);
-          content += kUserScriptTail;
-        }
-        sources.push_back(
-            WebScriptSource(WebString::fromUTF8(content), file.url()));
-      }
-    }
-
-    if (!sources.empty()) {
-      // Emulate Greasemonkey API for scripts that were converted to extensions
-      // and "standalone" user scripts.
-      if (script->is_standalone() || script->emulate_greasemonkey()) {
-        sources.insert(
-            sources.begin(),
-            WebScriptSource(WebString::fromUTF8(api_js_.as_string())));
-      }
-
-      int isolated_world_id = GetIsolatedWorldIdForExtension(extension, frame);
-
-      base::ElapsedTimer exec_timer;
-      DOMActivityLogger::AttachToWorld(isolated_world_id, extension->id());
-      frame->executeScriptInIsolatedWorld(isolated_world_id,
-                                          &sources.front(),
-                                          sources.size(),
-                                          EXTENSION_GROUP_CONTENT_SCRIPTS);
-      UMA_HISTOGRAM_TIMES("Extensions.InjectScriptTime", exec_timer.Elapsed());
-
-      for (std::vector<WebScriptSource>::const_iterator iter = sources.begin();
-           iter != sources.end();
-           ++iter) {
-        extensions_executing_scripts[extension->id()].insert(
-            GURL(iter->url).path());
-      }
-    }
+    injection->Inject(frame, location, &scripts_run_info);
   }
 
+  LogScriptsRun(frame, location, scripts_run_info);
+}
+
+void UserScriptSlave::LogScriptsRun(
+    blink::WebFrame* frame,
+    UserScript::RunLocation location,
+    const ScriptInjection::ScriptsRunInfo& info) {
   // Notify the browser if any extensions are now executing scripts.
-  if (!extensions_executing_scripts.empty()) {
-    top_render_view->Send(new ExtensionHostMsg_ContentScriptsExecuting(
-        top_render_view->GetRoutingID(),
-        extensions_executing_scripts,
-        top_render_view->GetPageId(),
-        ScriptContext::GetDataSourceURLForFrame(top_frame)));
+  if (!info.executing_scripts.empty()) {
+    content::RenderView* render_view =
+        content::RenderView::FromWebView(frame->view());
+    render_view->Send(new ExtensionHostMsg_ContentScriptsExecuting(
+        render_view->GetRoutingID(),
+        info.executing_scripts,
+        render_view->GetPageId(),
+        ScriptContext::GetDataSourceURLForFrame(frame)));
   }
 
-  // Log debug info.
   if (location == UserScript::DOCUMENT_START) {
-    UMA_HISTOGRAM_COUNTS_100("Extensions.InjectStart_CssCount", num_css);
-    UMA_HISTOGRAM_COUNTS_100("Extensions.InjectStart_ScriptCount", num_scripts);
-    if (num_css || num_scripts)
-      UMA_HISTOGRAM_TIMES("Extensions.InjectStart_Time", timer.Elapsed());
+    UMA_HISTOGRAM_COUNTS_100("Extensions.InjectStart_CssCount",
+                             info.num_css);
+    UMA_HISTOGRAM_COUNTS_100("Extensions.InjectStart_ScriptCount", info.num_js);
+    if (info.num_css || info.num_js)
+      UMA_HISTOGRAM_TIMES("Extensions.InjectStart_Time", info.timer.Elapsed());
   } else if (location == UserScript::DOCUMENT_END) {
-    UMA_HISTOGRAM_COUNTS_100("Extensions.InjectEnd_ScriptCount", num_scripts);
-    if (num_scripts)
-      UMA_HISTOGRAM_TIMES("Extensions.InjectEnd_Time", timer.Elapsed());
+    UMA_HISTOGRAM_COUNTS_100("Extensions.InjectEnd_ScriptCount", info.num_js);
+    if (info.num_js)
+      UMA_HISTOGRAM_TIMES("Extensions.InjectEnd_Time", info.timer.Elapsed());
   } else if (location == UserScript::DOCUMENT_IDLE) {
-    UMA_HISTOGRAM_COUNTS_100("Extensions.InjectIdle_ScriptCount", num_scripts);
-    if (num_scripts)
-      UMA_HISTOGRAM_TIMES("Extensions.InjectIdle_Time", timer.Elapsed());
+    UMA_HISTOGRAM_COUNTS_100("Extensions.InjectIdle_ScriptCount", info.num_js);
+    if (info.num_js)
+      UMA_HISTOGRAM_TIMES("Extensions.InjectIdle_Time", info.timer.Elapsed());
   } else {
     NOTREACHED();
   }
 }
 
 }  // namespace extensions