ppapi: PPB_VpnProvider: Define API

ppapi/cpp/vpn_provider.h

Index: ppapi/cpp/vpn_provider.h
diff --git a/ppapi/cpp/vpn_provider.h b/ppapi/cpp/vpn_provider.h
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+// Copyright 2016 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.
+
+#ifndef PPAPI_CPP_VPN_PROVIDER_H_
+#define PPAPI_CPP_VPN_PROVIDER_H_
+
+#include <string>
+
+#include "ppapi/c/ppb_vpn_provider.h"
+#include "ppapi/cpp/completion_callback.h"
+
+namespace pp {
+
+class InstanceHandle;
+
+/// @file
+/// This file defines the VpnProvider interface providing a way to implement a
+/// VPN client.
+/// Important: This API is available only on Chrome OS.
+
+/// The <code>VpnProvider</code> class providing a way to implement a VPN
+/// client.
+class VpnProvider : public Resource {
+ public:
+  /// Constructs a VpnProvider object.
+  ///
+  /// @param[in] instance The instance with which this resource will be
+  /// associated.
+  explicit VpnProvider(const InstanceHandle& instance);
+
+  /// Destructs a WebSocket object.
+  virtual ~VpnProvider();
+
+  /// Static function for determining whether the browser supports the
+  /// <code>VpnProvider</code> interface.
+  ///
+  /// @return true if the interface is available, false otherwise.
+  static bool IsAvailable();
+
+  /// Binds to an existing configuration created by
+  /// <code>chrome.vpnProvider.createConfig</code>. All packets will be routed
+  /// via <code>SendPacket</code> and <code>ReceivePacket</code>.
+  ///
+  /// @param[in] configuration_id The configuration id from the callback of
+  /// <code>chrome.vpnProvider.createConfig</code>.
+  ///
+  /// @param[in] configuration_name The configuration name as defined by the
+  /// user when calling <code>chrome.vpnProvider.createConfig</code>.
+  ///
+  /// @param[in] callback A <code>CompletionCallback</code> to be
+  /// called upon completion of Bind.
+  int32_t Bind(const Var& configuration_id,
+               const Var& configuration_name,
+               const CompletionCallback& callback);
+
+  /// GetUnbindEvent() registers a callback that will be called when the current
+  /// configuration gets unbound.
+  ///
+  /// @param[in] callback A <code>PP_CompletionCallback</code> called when
+  /// the current configuration gets unbound.
+  int32_t GetUnbindEvent(const CompletionCallback& callback);
+
+  /// Sends an IP packet through the tunnel created for the VPN session. This
+  /// will succeed only when the VPN session is owned by the module.
+  ///
+  /// @param[in] data IP packet to be sent to the platform. The <code>Var</code>
+  /// will be of ArrayBuffer type.
+  int32_t SendPacket(const Var& packet, const CompletionCallback& callback);
+
+  /// Receives an IP packet from the tunnel for the VPN session.
+  /// This function only returns a single packet. That is, this function must
+  /// be called at least N times to receive N packets, no matter the size of
+  /// each packet.
+  ///
+  /// @param[in] callback A <code>CompletionCallbackWithOutput</code> to be
+  /// called upon completion of ReceivePacket. It will be passed an ArrayBuffer
+  /// type <code>Var</code> containing an IP packet to be sent to the platform.
+  ///
+  /// @return An int32_t containing an error code from <code>pp_errors.h</code>.
+  /// If an error is detected or connection is closed, ReceivePacket() returns
+  /// <code>PP_ERROR_FAILED</code> after all buffered messages are received.
+  /// Until buffered packets become empty, ReceivePacket() continues to return
+  /// <code>PP_OK</code> as if connection is still established without errors.
+  int32_t ReceivePacket(const CompletionCallbackWithOutput<Var>& callback);
+
+ private:
+  InstanceHandle associated_instance_;
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_VPN_PROVIDER_H_