gecko/modules/plugin/base/src/nsPluginHost.h

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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 * Contributor(s):
 *  Josh Aas <josh@mozilla.com>
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#ifndef nsPluginHost_h_
#define nsPluginHost_h_

#include "nsIPluginHost.h"
#include "nsIObserver.h"
#include "nsCOMPtr.h"
#include "prlink.h"
#include "prclist.h"
#include "npapi.h"
#include "nsNPAPIPluginInstance.h"
#include "nsIPlugin.h"
#include "nsIPluginTag.h"
#include "nsPluginsDir.h"
#include "nsPluginDirServiceProvider.h"
#include "nsAutoPtr.h"
#include "nsWeakPtr.h"
#include "nsIPrompt.h"
#include "nsISupportsArray.h"
#include "nsIPrefBranch.h"
#include "nsWeakReference.h"
#include "nsThreadUtils.h"
#include "nsTArray.h"
#include "nsTObserverArray.h"
#include "nsITimer.h"
#include "nsPluginTags.h"

class nsNPAPIPlugin;
class nsIComponentManager;
class nsIFile;
class nsIChannel;

#if defined(XP_MACOSX) && !defined(NP_NO_CARBON)
#define MAC_CARBON_PLUGINS
#endif

class nsPluginHost : public nsIPluginHost,
                     public nsIObserver,
                     public nsITimerCallback,
                     public nsSupportsWeakReference
{
public:
  nsPluginHost();
  virtual ~nsPluginHost();

  static nsPluginHost* GetInst();
  static const char *GetPluginName(nsIPluginInstance *aPluginInstance);

  NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW

  NS_DECL_ISUPPORTS
  NS_DECL_NSIPLUGINHOST
  NS_DECL_NSIOBSERVER
  NS_DECL_NSITIMERCALLBACK

  NS_IMETHOD
  GetURL(nsISupports* pluginInst, 
         const char* url, 
         const char* target = NULL,
         nsIPluginStreamListener* streamListener = NULL,
         const char* altHost = NULL,
         const char* referrer = NULL,
         PRBool forceJSEnabled = PR_FALSE);
  
  NS_IMETHOD
  PostURL(nsISupports* pluginInst,
          const char* url,
          PRUint32 postDataLen, 
          const char* postData,
          PRBool isFile = PR_FALSE,
          const char* target = NULL,
          nsIPluginStreamListener* streamListener = NULL,
          const char* altHost = NULL, 
          const char* referrer = NULL,
          PRBool forceJSEnabled = PR_FALSE,
          PRUint32 postHeadersLength = 0, 
          const char* postHeaders = NULL);

  nsresult
  NewPluginURLStream(const nsString& aURL, 
                     nsIPluginInstance *aInstance, 
                     nsIPluginStreamListener *aListener,
                     const char *aPostData = nsnull, 
                     PRBool isFile = PR_FALSE,
                     PRUint32 aPostDataLen = 0, 
                     const char *aHeadersData = nsnull, 
                     PRUint32 aHeadersDataLen = 0);

  nsresult
  GetURLWithHeaders(nsISupports* pluginInst, 
                    const char* url, 
                    const char* target = NULL,
                    nsIPluginStreamListener* streamListener = NULL,
                    const char* altHost = NULL,
                    const char* referrer = NULL,
                    PRBool forceJSEnabled = PR_FALSE,
                    PRUint32 getHeadersLength = 0, 
                    const char* getHeaders = NULL);

  nsresult
  DoURLLoadSecurityCheck(nsIPluginInstance *aInstance,
                         const char* aURL);

  nsresult
  AddHeadersToChannel(const char *aHeadersData, PRUint32 aHeadersDataLen, 
                      nsIChannel *aGenericChannel);

  nsresult
  AddUnusedLibrary(PRLibrary * aLibrary);

  static nsresult GetPluginTempDir(nsIFile **aDir);

  // Writes updated plugins settings to disk and unloads the plugin
  // if it is now disabled
  nsresult UpdatePluginInfo(nsPluginTag* aPluginTag);

  // checks whether aTag is a "java" plugin tag (a tag for a plugin
  // that does Java)
  static PRBool IsJavaMIMEType(const char *aType);

  static nsresult GetPrompt(nsIPluginInstanceOwner *aOwner, nsIPrompt **aPrompt);

  static nsresult PostPluginUnloadEvent(PRLibrary* aLibrary);

  void AddIdleTimeTarget(nsIPluginInstanceOwner* objectFrame, PRBool isVisible);
  void RemoveIdleTimeTarget(nsIPluginInstanceOwner* objectFrame);

#ifdef MOZ_IPC
  void PluginCrashed(nsNPAPIPlugin* plugin);
#endif

private:
  nsresult
  TrySetUpPluginInstance(const char *aMimeType, nsIURI *aURL, nsIPluginInstanceOwner *aOwner);

  nsresult
  NewEmbeddedPluginStreamListener(nsIURI* aURL, nsIPluginInstanceOwner *aOwner,
                                  nsIPluginInstance* aInstance,
                                  nsIStreamListener** aListener);

  nsresult
  NewEmbeddedPluginStream(nsIURI* aURL, nsIPluginInstanceOwner *aOwner, nsIPluginInstance* aInstance);

  nsresult
  NewFullPagePluginStream(nsIStreamListener *&aStreamListener, nsIPluginInstance *aInstance);

  // Return an nsPluginTag for this type, if any.  If aCheckEnabled is
  // true, only enabled plugins will be returned.
  nsPluginTag*
  FindPluginForType(const char* aMimeType, PRBool aCheckEnabled);

  nsPluginTag*
  FindPluginEnabledForExtension(const char* aExtension, const char* &aMimeType);

  nsresult
  FindStoppedPluginForURL(nsIURI* aURL, nsIPluginInstanceOwner *aOwner);

  nsresult
  SetUpDefaultPluginInstance(const char *aMimeType, nsIURI *aURL, nsIPluginInstanceOwner *aOwner);

  nsresult
  AddInstanceToActiveList(nsCOMPtr<nsIPlugin> aPlugin,
                          nsIPluginInstance* aInstance,
                          nsIURI* aURL, PRBool aDefaultPlugin);

  nsresult
  FindPlugins(PRBool aCreatePluginList, PRBool * aPluginsChanged);

  nsresult
  ScanPluginsDirectory(nsIFile * pluginsDir, 
                       nsIComponentManager * compManager, 
                       PRBool aCreatePluginList,
                       PRBool * aPluginsChanged,
                       PRBool checkForUnwantedPlugins = PR_FALSE);
                       
  nsresult
  ScanPluginsDirectoryList(nsISimpleEnumerator * dirEnum,
                           nsIComponentManager * compManager, 
                           PRBool aCreatePluginList,
                           PRBool * aPluginsChanged,
                           PRBool checkForUnwantedPlugins = PR_FALSE);

  PRBool IsRunningPlugin(nsPluginTag * plugin);

  // Stores all plugins info into the registry
  nsresult WritePluginInfo();

  // Loads all cached plugins info into mCachedPlugins
  nsresult ReadPluginInfo();

  // Given a file path, returns the plugins info from our cache
  // and removes it from the cache.
  void RemoveCachedPluginsInfo(const char *filePath,
                               nsPluginTag **result);

  //checks if the list already have the same plugin as given
  nsPluginTag* HaveSamePlugin(nsPluginTag * aPluginTag);

  // checks if given plugin is a duplicate of what we already have
  // in the plugin list but found in some different place
  PRBool IsDuplicatePlugin(nsPluginTag * aPluginTag);

  nsresult EnsurePrivateDirServiceProvider();

  // calls PostPluginUnloadEvent for each library in mUnusedLibraries
  void UnloadUnusedLibraries();
  
  nsRefPtr<nsPluginTag> mPlugins;
  nsRefPtr<nsPluginTag> mCachedPlugins;
  PRPackedBool mPluginsLoaded;
  PRPackedBool mDontShowBadPluginMessage;
  PRPackedBool mIsDestroyed;

  // set by pref plugin.override_internal_types
  PRPackedBool mOverrideInternalTypes;

  // set by pref plugin.allow_alien_star_handler
  PRPackedBool mAllowAlienStarHandler;

  // set by pref plugin.default_plugin_disabled
  PRPackedBool mDefaultPluginDisabled;

  nsPluginInstanceTagList mPluginInstanceTagList;
  nsTArray<PRLibrary*> mUnusedLibraries;

  nsCOMPtr<nsIFile> mPluginRegFile;
  nsCOMPtr<nsIPrefBranch> mPrefService;
#ifdef XP_WIN
  nsRefPtr<nsPluginDirServiceProvider> mPrivateDirServiceProvider;
#endif

  nsWeakPtr mCurrentDocument; // weak reference, we use it to id document only

  static nsIFile *sPluginTempDir;

  // We need to hold a global ptr to ourselves because we register for
  // two different CIDs for some reason...
  static nsPluginHost* sInst;

#ifdef MAC_CARBON_PLUGINS
  nsCOMPtr<nsITimer> mVisiblePluginTimer;
  nsTObserverArray<nsIPluginInstanceOwner*> mVisibleTimerTargets;
  nsCOMPtr<nsITimer> mHiddenPluginTimer;
  nsTObserverArray<nsIPluginInstanceOwner*> mHiddenTimerTargets;
#endif
};

class NS_STACK_CLASS PluginDestructionGuard : protected PRCList
{
public:
  PluginDestructionGuard(nsIPluginInstance *aInstance)
    : mInstance(aInstance)
  {
    Init();
  }

  PluginDestructionGuard(NPP npp)
    : mInstance(npp ? static_cast<nsNPAPIPluginInstance*>(npp->ndata) : nsnull)
  {
    Init();
  }

  ~PluginDestructionGuard();

  static PRBool DelayDestroy(nsIPluginInstance *aInstance);

protected:
  void Init()
  {
    NS_ASSERTION(NS_IsMainThread(), "Should be on the main thread");

    mDelayedDestroy = PR_FALSE;

    PR_INIT_CLIST(this);
    PR_INSERT_BEFORE(this, &sListHead);
  }

  nsCOMPtr<nsIPluginInstance> mInstance;
  PRBool mDelayedDestroy;

  static PRCList sListHead;
};

#endif // nsPluginHost_h_