Add CefPermissionHandler callback for media access (fixes issue #2582)

include/cef_permission_handler.h

@@ -0,0 +1,97 @@
+// Copyright (c) 2022 Marshall A. Greenblatt. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the name Chromium Embedded
+// Framework nor the names of its contributors may be used to endorse
+// or promote products derived from this software without specific prior
+// written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// ---------------------------------------------------------------------------
+//
+// The contents of this file must follow a specific format in order to
+// support the CEF translator tool. See the translator.README.txt file in the
+// tools directory for more information.
+//
+
+#ifndef CEF_INCLUDE_CEF_PERMISSION_HANDLER_H_
+#define CEF_INCLUDE_CEF_PERMISSION_HANDLER_H_
+#pragma once
+
+#include "include/cef_base.h"
+#include "include/cef_browser.h"
+
+///
+// Callback interface used for asynchronous continuation of media access
+// permission requests.
+///
+/*--cef(source=library)--*/
+class CefMediaAccessCallback : public virtual CefBaseRefCounted {
+ public:
+  ///
+  // Call to allow or deny media access. If this callback was initiated in
+  // response to a getUserMedia (indicated by
+  // CEF_MEDIA_PERMISSION_DEVICE_AUDIO_CAPTURE and/or
+  // CEF_MEDIA_PERMISSION_DEVICE_VIDEO_CAPTURE being set) then
+  // |allowed_permissions| must match |required_permissions| passed to
+  // OnRequestMediaAccessPermission.
+  ///
+  /*--cef(capi_name=cont)--*/
+  virtual void Continue(uint32 allowed_permissions) = 0;
+
+  ///
+  // Cancel the media access request.
+  ///
+  /*--cef()--*/
+  virtual void Cancel() = 0;
+};
+
+///
+// Implement this interface to handle events related to permission requests. The
+// methods of this class will be called on the browser process UI thread.
+///
+/*--cef(source=client)--*/
+class CefPermissionHandler : public virtual CefBaseRefCounted {
+ public:
+  ///
+  // Called when a page requests permission to access media. |requesting_url| is
+  // the URL requesting permission. |requested_permissions| is a combination of
+  // values from cef_media_access_permission_types_t that represent the
+  // requested permissions. Return true and call
+  // CefMediaAccessCallback::Continue() either in this method or at a later time
+  // to continue or cancel the request. Return false to cancel the request
+  // immediately. This method will not be called if the "--enable-media-stream"
+  // command-line switch is used to grant all permissions.
+  ///
+  /*--cef()--*/
+  virtual bool OnRequestMediaAccessPermission(
+      CefRefPtr<CefBrowser> browser,
+      CefRefPtr<CefFrame> frame,
+      const CefString& requesting_url,
+      uint32 requested_permissions,
+      CefRefPtr<CefMediaAccessCallback> callback) {
+    return false;
+  }
+};
+
+#endif  // CEF_INCLUDE_CEF_PERMISSION_HANDLER_H_