Policy: Re-enabled plugin still disabled

webkit/plugins/npapi/plugin_list.cc

 // Copyright (c) 2010 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 "webkit/plugins/npapi/plugin_list.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 203 matching lines @@
   AutoLock lock(lock_);
   extra_plugin_dirs_.push_back(plugin_dir);
 #endif
 }
 
 void PluginList::RegisterInternalPlugin(const PluginVersionInfo& info) {
   AutoLock lock(lock_);
   internal_plugins_.push_back(info);
 }
 
-void PluginList::RegisterInternalPlugin(const FilePath& path) {
-  webkit::npapi::PluginVersionInfo info;
-  info.path = path;
-  memset(&info.entry_points, 0, sizeof(info.entry_points));
-  RegisterInternalPlugin(info);
-}
-
 void PluginList::RegisterInternalPlugin(const FilePath& filename,
                                         const std::string& name,
                                         const std::string& description,
                                         const std::string& mime_type,
                                         const PluginEntryPoints& entry_points) {
   webkit::npapi::PluginVersionInfo info = {
     filename,
     ASCIIToWide(name),
     ASCIIToWide(description),
     L"1",
@@ skipping 48 matching lines @@
   if (mime_types.empty()) {
     LOG_IF(ERROR, PluginList::DebugPluginLoading())
         << "Plugin " << pvi.product_name << " has no MIME types, skipping";
     return false;
   }
 
   info->name = WideToUTF16(pvi.product_name);
   info->desc = WideToUTF16(pvi.file_description);
   info->version = WideToUTF16(pvi.file_version);
   info->path = pvi.path;
-  info->enabled = true;
+  info->enabled = WebPluginInfo::USER_ENABLED_POLICY_UNMANAGED;
 
   for (size_t i = 0; i < mime_types.size(); ++i) {
     WebPluginMimeType mime_type;
     mime_type.mime_type = StringToLowerASCII(mime_types[i]);
     if (file_extensions.size() > i)
       base::SplitString(file_extensions[i], ',', &mime_type.file_extensions);
 
     if (descriptions.size() > i) {
       mime_type.description = descriptions[i];
 
@@ skipping 12 matching lines @@
     info->mime_types.push_back(mime_type);
   }
 
   return true;
 }
 
 PluginList::PluginList()
     : plugins_loaded_(false),
       plugins_need_refresh_(false),
       disable_outdated_plugins_(false),
-      next_priority_(0) {
+      next_priority_(1) {

[jam, 2011/01/19 20:22:09]

next_priority_ isn't needed amymore

[pastarmovj, 2011/01/19 23:39:17]

Done.

   PlatformInit();
   AddHardcodedPluginGroups();
 }
 
-bool PluginList::ShouldDisableGroup(const string16& group_name) {
-  AutoLock lock(lock_);
-  if (PluginGroup::IsPluginNameDisabledByPolicy(group_name)) {
-    disabled_groups_.insert(group_name);
-    return true;
-  }
-  return disabled_groups_.count(group_name) > 0;
-}
-
 void PluginList::LoadPlugins(bool refresh) {
   // Don't want to hold the lock while loading new plugins, so we don't block
   // other methods if they're called on other threads.
   std::vector<FilePath> extra_plugin_paths;
   std::vector<FilePath> extra_plugin_dirs;
   std::vector<PluginVersionInfo> internal_plugins;
   {
     AutoLock lock(lock_);
     if (plugins_loaded_ && !refresh && !plugins_need_refresh_)
       return;
@@ skipping 38 matching lines @@
   }
 
 #if defined(OS_WIN)
   LoadPluginsFromRegistry(&new_plugins, &visited_plugins);
 #endif
 
   // Load the default plugin last.
   if (webkit_glue::IsDefaultPluginEnabled())
     LoadPlugin(FilePath(kDefaultPluginLibraryName), &new_plugins);
 
+  AutoLock lock(lock_);
+  std::vector<std::string> empty_groups;
   // Disable all of the plugins and plugin groups that are disabled by policy.
-  // There's currenly a bug that makes it impossible to correctly re-enable
-  // plugins or plugin-groups to their original, "pre-policy" state, so
-  // plugins and groups are only changed to a more "safe" state after a policy
-  // change, i.e. from enabled to disabled. See bug 54681.
   for (PluginGroup::PluginMap::iterator it = plugin_groups_.begin();
        it != plugin_groups_.end(); ++it) {
     PluginGroup* group = it->second;
     string16 group_name = group->GetGroupName();
-    if (ShouldDisableGroup(group_name)) {
-      group->Enable(false);
+
+    const std::vector<WebPluginInfo>& gr_plugins = group->GetPlugins();
+    for (size_t i = 0; i < gr_plugins.size(); ++i) {
+      bool plugin_found = false;
+      for (size_t j = 0; j < new_plugins.size(); ++j) {
+        if (gr_plugins[i].path == new_plugins[j].path) {
+          plugin_found = true;
+          break;
+        }
+      }
+      if (!plugin_found) {
+        // Clean up the plugins that have disappeared from the groups.
+        group->RemovePlugin(gr_plugins[i].path);
+        --i;
+      } else {
+        // Set the disabled flag of all plugins scheduled for disabling.
+        for (size_t j = 0; j < prematurely_disabled_plugins_.size(); ++j) {
+          if (gr_plugins[i].path == prematurely_disabled_plugins_[j]) {
+            group->DisablePlugin(gr_plugins[i].path);
+          }
+        }
+      }
+    }
+    if (group->IsEmpty()) {

[jam, 2011/01/19 20:22:09]

if plugin_groups_ was a vector, wouldn't need the temporary empty_groups and
pruning since you can just erase it right away and do a continue.

[pastarmovj, 2011/01/19 23:39:17]

Ditto copied from plugin_group.cc question about the typedef:
The problem is that we want to differentiate different groups based on their
identifiers (which mostly coincide with names but in cases of collisions don't
see. PluginGroup::AddToPluginGroups). Therefore we have this maps there.

[jam, 2011/01/20 00:24:25]

in case of collision (when exactly?), can't we just set the group's name to the
new name?

+      if (!group->Enabled())
+        prematurely_disabled_groups_.push_back(group->GetGroupName());
+      empty_groups.push_back(it->first);
     }
 
-    if (disable_outdated_plugins_) {
+    group->EnforceGroupPolicy();
+    if (disable_outdated_plugins_)
       group->DisableOutdatedPlugins();
-    }
-    if (!group->Enabled()) {
-      AutoLock lock(lock_);
-      disabled_groups_.insert(group_name);
-    }
   }
+  // Prune empty groups.
+  for(size_t i = 0; i < empty_groups.size(); ++i)
+    plugin_groups_.erase(empty_groups[i]);
 
-  // Only update the data now since loading plugins can take a while.
-  AutoLock lock(lock_);
+  // We flush the list of prematurely disabled plugins after the load has
+  // finished. If for some reason a plugin reappears on a second load it is
+  // going to be loaded normally. This is only true for non-policy controlled
+  // plugins though.
+  prematurely_disabled_plugins_.clear();
 
-  plugins_ = new_plugins;
   plugins_loaded_ = true;
 }
 
 void PluginList::LoadPlugin(const FilePath& path,
                             std::vector<WebPluginInfo>* plugins) {
   LOG_IF(ERROR, PluginList::DebugPluginLoading())
       << "Loading plugin " << path.value();
-
   WebPluginInfo plugin_info;
   const PluginEntryPoints* entry_points;
 
   if (!ReadPluginInfo(path, &plugin_info, &entry_points))
     return;
 
   if (!ShouldLoadPlugin(plugin_info, plugins))
     return;
 
   if (path.value() != kDefaultPluginLibraryName
 #if defined(OS_WIN) && !defined(NDEBUG)
       && path.BaseName().value() != L"npspy.dll"  // Make an exception for NPSPY
 #endif
       ) {
     for (size_t i = 0; i < plugin_info.mime_types.size(); ++i) {
       // TODO: don't load global handlers for now.
       // WebKit hands to the Plugin before it tries
       // to handle mimeTypes on its own.
       const std::string &mime_type = plugin_info.mime_types[i].mime_type;
       if (mime_type == "*" )
         return;
     }
   }
 
-  // Mark disabled plugins as such. (This has to happen before calling
-  // |AddToPluginGroups(plugin_info)|.)
-  if (disabled_plugins_.count(plugin_info.path)) {
-    plugin_info.enabled = false;
-  } else {
-    plugin_info.enabled = true;
-  }
-
   AutoLock lock(lock_);

[jam, 2011/01/19 20:22:09]

this code is broken I think.  unfortunately the way the groups stuff got bolted
onto PluginList broke one of the characteristics of PluginList, which is that
loading the plugins doesn't use the lock or update any member variables until
everything is loaded off disk, and then, does it in atomically.  Now,
plugin_groups_ is changing during refreshing the plugins.  Someone calling
GetPlugins() now during plugin loading can get inconsistent results.

What we need is for LoadPlugin to not modify any member variables, including
plugin_groups_ (i.e. indirectly through AddToPluginGroups).  It should treat
groups like plugins, i.e. it should have another parameter that is a container
holding PluginGroup, and it should only modify that.  Then LoadPlugins() can
swap the new plugin_groups_ in at the last minute, just like how it used to do
with plugins_

[pastarmovj, 2011/01/19 23:39:17]

I don't think it is that bad. Actually the way we handle this list now ensures a
bit more consistency than before. Before until the load has finished we had the
old list. Now every new plugin discovered is immediately visible to a new
GetPlugins and all old are too. In this sense more "true" information is
present. The end of LoadPlugins locks the access to the groups and prunes the
missing plugins so that after it finishes the rest is only true information.

[jam, 2011/01/20 00:24:25]

I'm not sure which consistency you're referring to?  Now, if the plugin is in
the process of being updated on disk, you might get both new and old versions
together, no?  I don't think we want to send a list of plugins that isn't fully
finished updating yet to callers.  There could be other weird scenarios.  The
old code didn't modify the state while updating to avoid any issues, and also to
simplify the locking (i.e. it was sure that no locks would be held by functions
it used).

+  AddToPluginGroups(plugin_info);
   plugins->push_back(plugin_info);
-  AddToPluginGroups(plugin_info);
 }
 
-bool PluginList::SupportsType(const WebPluginInfo& info,
-                              const std::string &mime_type,
-                              bool allow_wildcard) {
-  // Webkit will ask for a plugin to handle empty mime types.
-  if (mime_type.empty())
-    return false;
-
-  for (size_t i = 0; i < info.mime_types.size(); ++i) {
-    const WebPluginMimeType& mime_info = info.mime_types[i];
-    if (net::MatchesMimeType(mime_info.mime_type, mime_type)) {
-      if (!allow_wildcard && mime_info.mime_type == "*") {
-        continue;
-      }
-      return true;
-    }
-  }
-  return false;
-}
-
-bool PluginList::SupportsExtension(const WebPluginInfo& info,
-                                   const std::string &extension,
-                                   std::string* actual_mime_type) {
-  for (size_t i = 0; i < info.mime_types.size(); ++i) {
-    const WebPluginMimeType& mime_type = info.mime_types[i];
-    for (size_t j = 0; j < mime_type.file_extensions.size(); ++j) {
-      if (mime_type.file_extensions[j] == extension) {
-        if (actual_mime_type)
-          *actual_mime_type = mime_type.mime_type;
-        return true;
-      }
-    }
-  }
-
-  return false;
-}
-
-
 void PluginList::GetPlugins(bool refresh, std::vector<WebPluginInfo>* plugins) {
   LoadPlugins(refresh);
 
   AutoLock lock(lock_);
-  *plugins = plugins_;
+  for (PluginGroup::PluginMap::const_iterator group = plugin_groups_.begin();
+       group != plugin_groups_.end(); ++group) {
+    const std::vector<WebPluginInfo>& gr_plugins = group->second->GetPlugins();
+    plugins->insert(plugins->end(), gr_plugins.begin(), gr_plugins.end());
+  }
 }
 
 void PluginList::GetEnabledPlugins(bool refresh,
                                    std::vector<WebPluginInfo>* plugins) {
   LoadPlugins(refresh);
 
   plugins->clear();
   AutoLock lock(lock_);
-  for (std::vector<WebPluginInfo>::const_iterator it = plugins_.begin();
-       it != plugins_.end();
-       ++it) {
-    if (it->enabled)
-      plugins->push_back(*it);
+  for (PluginGroup::PluginMap::const_iterator group = plugin_groups_.begin();
+       group != plugin_groups_.end(); ++group) {
+    const std::vector<WebPluginInfo>& gr_plugins = group->second->GetPlugins();
+    for (size_t i = 0; i < gr_plugins.size(); ++i) {
+      if (IsPluginEnabled(gr_plugins[i]))
+        plugins->push_back(gr_plugins[i]);
+    }
   }
 }
 
 void PluginList::GetPluginInfoArray(
     const GURL& url,
     const std::string& mime_type,
     bool allow_wildcard,
     std::vector<WebPluginInfo>* info,
     std::vector<std::string>* actual_mime_types) {
   DCHECK(mime_type == StringToLowerASCII(mime_type));
   DCHECK(info);
 
   LoadPlugins(false);
   AutoLock lock(lock_);
   info->clear();
   if (actual_mime_types)
     actual_mime_types->clear();
 
   std::set<FilePath> visited_plugins;
 
   // Add in enabled plugins by mime type.
   WebPluginInfo default_plugin;
-  for (size_t i = 0; i < plugins_.size(); ++i) {
-    if (plugins_[i].enabled &&
-        SupportsType(plugins_[i], mime_type, allow_wildcard)) {
-      FilePath path = plugins_[i].path;
-      if (path.value() != kDefaultPluginLibraryName &&
-          visited_plugins.insert(path).second) {
-        info->push_back(plugins_[i]);
-        if (actual_mime_types)
-          actual_mime_types->push_back(mime_type);
+  for (PluginGroup::PluginMap::const_iterator group = plugin_groups_.begin();
+       group != plugin_groups_.end(); ++group) {
+    const std::vector<WebPluginInfo>& plugins = group->second->GetPlugins();
+    for (size_t i = 0; i < plugins.size(); ++i) {
+      if (IsPluginEnabled(plugins[i]) && SupportsType(plugins[i],
+                                             mime_type, allow_wildcard)) {
+        FilePath path = plugins[i].path;
+        if (path.value() != kDefaultPluginLibraryName &&
+            visited_plugins.insert(path).second) {
+          info->push_back(plugins[i]);
+          if (actual_mime_types)
+            actual_mime_types->push_back(mime_type);
+        }
       }
     }
   }
 
   // Add in enabled plugins by url.
   std::string path = url.path();
   std::string::size_type last_dot = path.rfind('.');
   if (last_dot != std::string::npos) {
     std::string extension = StringToLowerASCII(std::string(path, last_dot+1));
     std::string actual_mime_type;
-    for (size_t i = 0; i < plugins_.size(); ++i) {
-      if (plugins_[i].enabled &&
-          SupportsExtension(plugins_[i], extension, &actual_mime_type)) {
-        FilePath path = plugins_[i].path;
-        if (path.value() != kDefaultPluginLibraryName &&
-            visited_plugins.insert(path).second) {
-          info->push_back(plugins_[i]);
-          if (actual_mime_types)
-            actual_mime_types->push_back(actual_mime_type);
+    for (PluginGroup::PluginMap::const_iterator group = plugin_groups_.begin();
+         group != plugin_groups_.end(); ++group) {
+      const std::vector<WebPluginInfo>& plugins = group->second->GetPlugins();
+      for (size_t i = 0; i < plugins.size(); ++i) {
+        if (IsPluginEnabled(plugins[i]) &&
+            SupportsExtension(plugins[i], extension, &actual_mime_type)) {
+          FilePath path = plugins[i].path;
+          if (path.value() != kDefaultPluginLibraryName &&
+              visited_plugins.insert(path).second) {
+            info->push_back(plugins[i]);
+            if (actual_mime_types)
+              actual_mime_types->push_back(actual_mime_type);
+          }
         }
       }
     }
   }
 
   // Add in disabled plugins by mime type.
-  for (size_t i = 0; i < plugins_.size(); ++i) {
-    if (!plugins_[i].enabled &&
-        SupportsType(plugins_[i], mime_type, allow_wildcard)) {
-      FilePath path = plugins_[i].path;
-      if (path.value() != kDefaultPluginLibraryName &&
-          visited_plugins.insert(path).second) {
-        info->push_back(plugins_[i]);
-        if (actual_mime_types)
-          actual_mime_types->push_back(mime_type);
+  for (PluginGroup::PluginMap::const_iterator group = plugin_groups_.begin();
+       group != plugin_groups_.end(); ++group) {
+    const std::vector<WebPluginInfo>& plugins = group->second->GetPlugins();
+    for (size_t i = 0; i < plugins.size(); ++i) {
+      if (!IsPluginEnabled(plugins[i]) &&
+          SupportsType(plugins[i], mime_type, allow_wildcard)) {
+        FilePath path = plugins[i].path;
+        if (path.value() != kDefaultPluginLibraryName &&
+            visited_plugins.insert(path).second) {
+          info->push_back(plugins[i]);
+          if (actual_mime_types)
+            actual_mime_types->push_back(mime_type);
+        }
       }
     }
   }
 
   // Add the default plugin at the end if it supports the mime type given,
   // and the default plugin is enabled.
-  if (!plugins_.empty() && webkit_glue::IsDefaultPluginEnabled()) {
-    const WebPluginInfo& default_info = plugins_.back();
-    if (SupportsType(default_info, mime_type, allow_wildcard)) {
-      info->push_back(default_info);
-      if (actual_mime_types)
-        actual_mime_types->push_back(mime_type);
+  for (PluginGroup::PluginMap::const_iterator group = plugin_groups_.begin();
+       group != plugin_groups_.end(); ++group) {
+#if defined(OS_WIN)
+    if (group->first.compare(WideToUTF8(kDefaultPluginLibraryName)) == 0) {
+#else
+    if (group->first.compare(kDefaultPluginLibraryName) == 0) {
+#endif
+      DCHECK_NE(0U, group->second->GetPlugins().size());
+      const WebPluginInfo& default_info = group->second->GetPlugins().front();
+      if (SupportsType(default_info, mime_type, allow_wildcard)) {
+        info->push_back(default_info);
+        if (actual_mime_types)
+          actual_mime_types->push_back(mime_type);
+      }
     }
   }
 }
 
 bool PluginList::GetPluginInfo(const GURL& url,
                                const std::string& mime_type,
                                bool allow_wildcard,
                                WebPluginInfo* info,
                                std::string* actual_mime_type) {
   DCHECK(info);
@@ skipping 17 matching lines @@
       return true;
     }
   }
   return false;
 }
 
 bool PluginList::GetPluginInfoByPath(const FilePath& plugin_path,
                                      WebPluginInfo* info) {
   LoadPlugins(false);
   AutoLock lock(lock_);
-  for (size_t i = 0; i < plugins_.size(); ++i) {
-    if (plugins_[i].path == plugin_path) {
-      *info = plugins_[i];
-      return true;
+  for (PluginGroup::PluginMap::const_iterator group = plugin_groups_.begin();
+       group != plugin_groups_.end(); ++group) {
+    const std::vector<WebPluginInfo>& plugins = group->second->GetPlugins();
+    for (size_t i = 0; i < plugins.size(); ++i) {
+      if (plugins[i].path == plugin_path) {
+        *info = plugins[i];
+        return true;
+      }
     }
   }
 
   return false;
 }
 
 void PluginList::GetPluginGroups(
     bool load_if_necessary,
     std::vector<PluginGroup>* plugin_groups) {
   if (load_if_necessary)
     LoadPlugins(false);
+  AutoLock lock(lock_);
   plugin_groups->clear();
   for (PluginGroup::PluginMap::const_iterator it = plugin_groups_.begin();
        it != plugin_groups_.end(); ++it) {
-    if (!it->second->IsEmpty())
+    // In some unit tests we can get confronted with empty groups but in real
+    // world code this if should never be false here.
+    if(!it->second->IsEmpty())
       plugin_groups->push_back(*it->second);
   }
 }
 
 const PluginGroup* PluginList::GetPluginGroup(
     const WebPluginInfo& web_plugin_info) {
   AutoLock lock(lock_);
   return AddToPluginGroups(web_plugin_info);
 }
 
@@ skipping 11 matching lines @@
   PluginGroup* group = AddToPluginGroups(web_plugin_info);
   return group->identifier();
 }
 
 void PluginList::AddHardcodedPluginGroups() {
   AutoLock lock(lock_);
   const PluginGroupDefinition* definitions = GetPluginGroupDefinitions();
   for (size_t i = 0; i < GetPluginGroupDefinitionsSize(); ++i) {
     PluginGroup* definition_group = PluginGroup::FromPluginGroupDefinition(
         definitions[i]);
+    ProcessGroupAfterInitialize(definition_group);
     std::string identifier = definition_group->identifier();
     DCHECK(plugin_groups_.find(identifier) == plugin_groups_.end());
     plugin_groups_.insert(std::make_pair(identifier, definition_group));
   }
 }
 
 PluginGroup* PluginList::AddToPluginGroups(
     const WebPluginInfo& web_plugin_info) {
   PluginGroup* group = NULL;
   for (PluginGroup::PluginMap::iterator it = plugin_groups_.begin();
        it != plugin_groups_.end(); ++it) {
-    if (it->second->Match(web_plugin_info))
+    if (it->second->Match(web_plugin_info)) {
       group = it->second;
+      break;
+    }
   }
   if (!group) {
     group = PluginGroup::FromWebPluginInfo(web_plugin_info);
+    // If group is scheduled for disabling do that now and remove it from the
+    // list.
+    for(size_t i = 0; i < prematurely_disabled_groups_.size(); ++i) {
+      if (group->GetGroupName() == prematurely_disabled_groups_[i]) {
+        group->EnableGroup(false);
+        prematurely_disabled_groups_.erase(
+            prematurely_disabled_groups_.begin() + i);
+      }
+    }
+    ProcessGroupAfterInitialize(group);
     std::string identifier = group->identifier();
     // If the identifier is not unique, use the full path. This means that we
     // probably won't be able to search for this group by identifier, but at
     // least it's going to be in the set of plugin groups, and if there
     // is already a plug-in with the same filename, it's probably going to
     // handle the same MIME types (and it has a higher priority), so this one
     // is not going to run anyway.
     if (plugin_groups_.find(identifier) != plugin_groups_.end())
       identifier = PluginGroup::GetLongIdentifier(web_plugin_info);
     DCHECK(plugin_groups_.find(identifier) == plugin_groups_.end());
     plugin_groups_.insert(std::make_pair(identifier, group));
   }
-  group->AddPlugin(web_plugin_info, next_priority_++);
+  bool is_new_addition = group->AddPlugin(web_plugin_info, next_priority_);
+  if (is_new_addition)
+    next_priority_++;
   return group;
 }
 
 bool PluginList::EnablePlugin(const FilePath& filename) {
   AutoLock lock(lock_);
-
-  bool did_enable = false;
-
-  std::set<FilePath>::iterator entry = disabled_plugins_.find(filename);
-  if (entry == disabled_plugins_.end())
-    return did_enable;  // Early exit if plugin not in disabled list.
-
-  disabled_plugins_.erase(entry);  // Remove from disabled list.
-
-  // Set enabled flags if necessary.
-  for (std::vector<WebPluginInfo>::iterator it = plugins_.begin();
-       it != plugins_.end();
-       ++it) {
-    if (it->path == filename) {
-      DCHECK(!it->enabled);  // Should have been disabled.
-      it->enabled = true;
-      did_enable = true;
-    }
+  for (PluginGroup::PluginMap::iterator it = plugin_groups_.begin();
+       it != plugin_groups_.end(); ++it) {
+    if (it->second->ContainsPlugin(filename))
+      return it->second->EnablePlugin(filename);
   }
 
-  return did_enable;
+  // Non existing plugin is beig enabled. Ignore this request for now because
+  // plugins are anyway born enabled.
+  return true;
 }
 
 bool PluginList::DisablePlugin(const FilePath& filename) {
   AutoLock lock(lock_);
-
-  bool did_disable = false;
-
-  if (disabled_plugins_.find(filename) != disabled_plugins_.end())
-    return did_disable;  // Early exit if plugin already in disabled list.
-
-  disabled_plugins_.insert(filename);  // Add to disabled list.
-
-  // Unset enabled flags if necessary.
-  for (std::vector<WebPluginInfo>::iterator it = plugins_.begin();
-       it != plugins_.end();
-       ++it) {
-    if (it->path == filename) {
-      DCHECK(it->enabled);  // Should have been enabled.
-      it->enabled = false;
-      did_disable = true;
-    }
+  for (PluginGroup::PluginMap::iterator it = plugin_groups_.begin();
+       it != plugin_groups_.end(); ++it) {
+    if (it->second->ContainsPlugin(filename))
+      return it->second->DisablePlugin(filename);
   }
 
-  return did_disable;
+  // Non existing plugin is being disabled. Queue the plugin so that on the next
+  // load plugins call they will be disabled.
+  prematurely_disabled_plugins_.push_back(filename);
+  return true;
 }
 
 bool PluginList::EnableGroup(bool enable, const string16& group_name) {
-  bool did_change = false;
-  {
-    AutoLock lock(lock_);
-
-    std::set<string16>::iterator entry = disabled_groups_.find(group_name);
-    if (enable) {
-      if (entry == disabled_groups_.end())
-        return did_change;  // Early exit if group not in disabled list.
-      disabled_groups_.erase(entry);  // Remove from disabled list.
-    } else {
-      if (entry != disabled_groups_.end())
-        return did_change;  // Early exit if group already in disabled list.
-      disabled_groups_.insert(group_name);
+  AutoLock lock(lock_);
+  PluginGroup* group = NULL;
+  for (PluginGroup::PluginMap::iterator it = plugin_groups_.begin();
+       it != plugin_groups_.end(); ++it) {
+    if (it->second->GetGroupName().find(group_name) != string16::npos) {
+      group = it->second;
+      break;
     }
   }
+  if (!group) {
+    // Non existing group is being enabled. Queue the group so that on the next
+    // load plugins call they will be disabled.
+    if(!enable)
+      prematurely_disabled_groups_.push_back(group_name);
+    return true;
+  }
 
-  for (PluginGroup::PluginMap::iterator it = plugin_groups_.begin();
-       it != plugin_groups_.end(); ++it) {
-    if (it->second->GetGroupName() == group_name) {
-      if (it->second->Enabled() != enable) {
-        it->second->Enable(enable);
-        did_change = true;
-        break;
+  return group->EnableGroup(enable);
+}
+
+bool PluginList::SupportsType(const WebPluginInfo& plugin,
+                              const std::string& mime_type,
+                              bool allow_wildcard) {
+  // Webkit will ask for a plugin to handle empty mime types.
+  if (mime_type.empty())
+    return false;
+
+  for (size_t i = 0; i < plugin.mime_types.size(); ++i) {
+    const WebPluginMimeType& mime_info = plugin.mime_types[i];
+    if (net::MatchesMimeType(mime_info.mime_type, mime_type)) {
+      if (!allow_wildcard && mime_info.mime_type == "*")
+        continue;
+      return true;
+    }
+  }
+  return false;
+}
+
+bool PluginList::SupportsExtension(const WebPluginInfo& plugin,
+                                   const std::string& extension,
+                                   std::string* actual_mime_type) {
+  for (size_t i = 0; i < plugin.mime_types.size(); ++i) {
+    const WebPluginMimeType& mime_type = plugin.mime_types[i];
+    for (size_t j = 0; j < mime_type.file_extensions.size(); ++j) {
+      if (mime_type.file_extensions[j] == extension) {
+        if (actual_mime_type)
+          *actual_mime_type = mime_type.mime_type;
+        return true;
       }
     }
   }
-
-  return did_change;
+  return false;
 }
 
 void PluginList::DisableOutdatedPluginGroups() {
   disable_outdated_plugins_ = true;
 }
 
 PluginList::~PluginList() {
   Shutdown();
 }
 
 void PluginList::Shutdown() {
   STLDeleteContainerPairSecondPointers(plugin_groups_.begin(),
                                        plugin_groups_.end());
 }
 
 }  // namespace npapi
 }  // namespace webkit