dom/base/nsPluginArray.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef nsPluginArray_h___
   8 #define nsPluginArray_h___
   9
  10 #include "nsWeakReference.h"
  11 #include "nsWrapperCache.h"
  12 #include "nsCOMPtr.h"
  13 #include "nsString.h"
  14 #include "nsTArray.h"
  15 #include "mozilla/Array.h"
  16
  17 class nsPIDOMWindowInner;
  18 class nsPluginElement;
  19 class nsMimeTypeArray;
  20 class nsMimeType;
  21
  22 /**
  23  * Array class backing HTML's navigator.plugins.  This always holds references
  24  * to the hard-coded set of PDF plugins defined by HTML but it only consults
  25  * them if "pdfjs.disabled" is false.  There is never more than one of these
  26  * per DOM window.
  27  */
  28 class nsPluginArray final : public nsSupportsWeakReference,
  29                             public nsWrapperCache {
  30  public:
  31   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  32   NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(nsPluginArray)
  33
  34   explicit nsPluginArray(nsPIDOMWindowInner* aWindow);
  35   nsPIDOMWindowInner* GetParentObject() const;
  36   virtual JSObject* WrapObject(JSContext* aCx,
  37                                JS::Handle<JSObject*> aGivenProto) override;
  38
  39   nsMimeTypeArray* MimeTypeArray() { return mMimeTypeArray; }
  40
  41   // PluginArray WebIDL methods
  42   uint32_t Length() { return ForceNoPlugins() ? 0 : ArrayLength(mPlugins); }
  43
  44   nsPluginElement* Item(uint32_t aIndex) {
  45     bool unused;
  46     return IndexedGetter(aIndex, unused);
  47   }
  48
  49   nsPluginElement* NamedItem(const nsAString& aName) {
  50     bool unused;
  51     return NamedGetter(aName, unused);
  52   }
  53
  54   nsPluginElement* IndexedGetter(uint32_t aIndex, bool& aFound);
  55
  56   nsPluginElement* NamedGetter(const nsAString& aName, bool& aFound);
  57
  58   void GetSupportedNames(nsTArray<nsString>& aRetval);
  59
  60   void Refresh() {}
  61
  62  private:
  63   virtual ~nsPluginArray();
  64
  65   bool ForceNoPlugins();
  66
  67   RefPtr<nsMimeTypeArray> mMimeTypeArray;
  68   nsCOMPtr<nsPIDOMWindowInner> mWindow;
  69   mozilla::Array<RefPtr<nsPluginElement>, 5> mPlugins;
  70 };
  71
  72 /**
  73  * Plugin class backing entries in HTML's navigator.plugins array.  There is
  74  * a fixed set of these, as defined by HTML.
  75  */
  76 class nsPluginElement final : public nsISupports, public nsWrapperCache {
  77  public:
  78   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  79   NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(nsPluginElement)
  80
  81   explicit nsPluginElement(nsPluginArray* aPluginArray,
  82                            nsPIDOMWindowInner* aWindow, const nsAString& aName);
  83
  84   nsPluginArray* GetParentObject() const;
  85
  86   virtual JSObject* WrapObject(JSContext* aCx,
  87                                JS::Handle<JSObject*> aGivenProto) override;
  88
  89   // Plugin WebIDL methods
  90   void GetDescription(nsString& retval) const { retval = kDescription; }
  91
  92   void GetFilename(nsString& retval) const { retval = kFilename; }
  93
  94   void GetName(nsString& retval) const { retval = mName; }
  95   const nsString& Name() const { return mName; }
  96
  97   nsMimeType* Item(uint32_t index) {
  98     bool unused;
  99     return IndexedGetter(index, unused);
 100   }
 101
 102   nsMimeType* NamedItem(const nsAString& name) {
 103     bool unused;
 104     return NamedGetter(name, unused);
 105   }
 106
 107   uint32_t Length();
 108
 109   nsMimeType* IndexedGetter(uint32_t index, bool& found);
 110
 111   nsMimeType* NamedGetter(const nsAString& name, bool& found);
 112
 113   void GetSupportedNames(nsTArray<nsString>& retval);
 114
 115  protected:
 116   virtual ~nsPluginElement() = default;
 117
 118   nsMimeTypeArray* MimeTypeArray() { return mPluginArray->MimeTypeArray(); }
 119
 120   static constexpr nsLiteralString kDescription =
 121       u"Portable Document Format"_ns;
 122   static constexpr nsLiteralString kFilename = u"internal-pdf-viewer"_ns;
 123
 124   // Note that this creates an explicit reference cycle:
 125   //
 126   // nsPluginElement -> nsPluginArray -> nsPluginElement
 127   //
 128   // We rely on the cycle collector to break this cycle.
 129   RefPtr<nsPluginArray> mPluginArray;
 130   nsCOMPtr<nsPIDOMWindowInner> mWindow;
 131   nsString mName;
 132 };
 133
 134 #endif /* nsPluginArray_h___ */