Weave Packet Generator

components/proximity_auth/ble/bluetooth_low_energy_weave_packet_generator_unittest.cc

Index: components/proximity_auth/ble/bluetooth_low_energy_weave_packet_generator_unittest.cc
diff --git a/components/proximity_auth/ble/bluetooth_low_energy_weave_packet_generator_unittest.cc b/components/proximity_auth/ble/bluetooth_low_energy_weave_packet_generator_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7d0c39eaacd15ef516869bdfff42257225bc9437
--- /dev/null
+++ b/components/proximity_auth/ble/bluetooth_low_energy_weave_packet_generator_unittest.cc
@@ -0,0 +1,270 @@
+// 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.
+
+#include "components/proximity_auth/ble/bluetooth_low_energy_weave_packet_generator.h"
+
+#include <algorithm>
+#include <string>
+
+#include "base/logging.h"
+#include "base/macros.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using proximity_auth::BluetoothLowEnergyWeavePacketGenerator;
+
+namespace {
+typedef BluetoothLowEnergyWeavePacketGenerator::ReasonForClose ReasonForClose;
+typedef BluetoothLowEnergyWeavePacketGenerator::Packet Packet;
+
+const uint8_t kDefaultPacketSize = 20;
+const uint8_t kWeaveVersion = 1;
+const uint8_t kMaxCounter = 8;
+const uint8_t kEmptyUpperByte = 0;
+const uint8_t kSelectDefaultPacketSize = 0;
+const uint8_t kDataType = 0;
+
+}  // namespace
+
+namespace proximity_auth {
+
+class ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest
+    : public testing::Test {
+ protected:
+  ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest() {}
+
+  void TestConnectionCloseWithReason(ReasonForClose reason_for_close,
+                                     uint8_t expected_reason_for_close) {
+    std::unique_ptr<BluetoothLowEnergyWeavePacketGenerator> generator =
+        BluetoothLowEnergyWeavePacketGenerator::Factory::NewInstance();
+
+    Packet packet = generator->CreateConnectionClose(reason_for_close);
+
+    const uint16_t kCloseSize = 3;
+    Packet expected(kCloseSize, 0);
+    // uWeave Header:
+    // 1--- ---- : type = 1 (control packet)
+    // -000 ---- : counter = 0
+    // ---- 0010 : command = 2 (close)
+    // 1000 0010 = 0x82
+    expected = {0x82, kEmptyUpperByte, expected_reason_for_close};
+
+    EXPECT_EQ(expected, packet);
+  }
+
+  uint8_t GetCounterFromHeader(uint8_t header) { return (header >> 4) & 7; }
+
+  uint8_t GetPacketType(uint8_t header) { return (header >> 7) & 1; }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(
+      ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest);
+};
+
+TEST_F(ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest,
+       CreateConnectionRequestTest) {
+  std::unique_ptr<BluetoothLowEnergyWeavePacketGenerator> generator =
+      BluetoothLowEnergyWeavePacketGenerator::Factory::NewInstance();
+
+  Packet packet = generator->CreateConnectionRequest();
+
+  const uint16_t kRequestSize = 7;
+  Packet expected(kRequestSize, 0);
+  // uWeave Header:
+  // 1--- ---- :  type = 1 (control packet)
+  // -000 ---- : counter = 0
+  // ---- 0000 : command = 0 (request)
+  // 1000 0000 = 0x80
+  expected = {
+      0x80,          kEmptyUpperByte, kWeaveVersion,           kEmptyUpperByte,
+      kWeaveVersion, kEmptyUpperByte, kSelectDefaultPacketSize};
+
+  EXPECT_EQ(expected, packet);
+}
+
+TEST_F(ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest,
+       CreateConnectionResponseWithDefaultPacketSizeTest) {
+  std::unique_ptr<BluetoothLowEnergyWeavePacketGenerator> generator =
+      BluetoothLowEnergyWeavePacketGenerator::Factory::NewInstance();
+
+  Packet packet = generator->CreateConnectionResponse();
+
+  const uint16_t kResponseSize = 5;
+  Packet expected_default(kResponseSize, 0);
+  // uWeave Header:
+  // 1--- ---- : type = 1 (control packet)
+  // -000 ---- : counter = 0
+  // ---- 0001 : command = 1 (response)
+  // 1000 0001 = 0x81
+  expected_default = {0x81, kEmptyUpperByte, kWeaveVersion, kEmptyUpperByte,
+                      kDefaultPacketSize};
+
+  EXPECT_EQ(expected_default, packet);
+}
+
+TEST_F(ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest,
+       CreateConnectionResponseWithSelectedPacketSizeTest) {
+  std::unique_ptr<BluetoothLowEnergyWeavePacketGenerator> generator =
+      BluetoothLowEnergyWeavePacketGenerator::Factory::NewInstance();
+
+  const uint8_t kSelectedPacketSize = 30;
+  const uint16_t kResponseSize = 5;
+
+  generator->SetMaxPacketSize(kSelectedPacketSize);
+
+  Packet packet = generator->CreateConnectionResponse();
+
+  Packet expected_selected(kResponseSize, 0);
+  // uWeave Header:
+  // 1--- ---- : type = 1 (control packet)
+  // -000 ---- : counter = 0
+  // ---- 0001 : command = 1 (response)
+  // 1000 0001 = 0x81
+  expected_selected = {0x81, kEmptyUpperByte, kWeaveVersion, kEmptyUpperByte,
+                       kSelectedPacketSize};
+  EXPECT_EQ(expected_selected, packet);
+}
+
+TEST_F(ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest,
+       CreateConnectionCloseTest) {
+  // Reason for close spec of uWeave.
+  // 0x00: Close without error
+  // 0x01: Unknown error
+  // 0x02: No common version supported
+  // 0x03: Received packet out of sequence
+  // 0x80: Application error
+
+  TestConnectionCloseWithReason(ReasonForClose::CLOSE_WITHOUT_ERROR, 0x00);
+  TestConnectionCloseWithReason(ReasonForClose::UNKNOWN_ERROR, 0x01);
+  TestConnectionCloseWithReason(ReasonForClose::NO_COMMON_VERSION_SUPPORTED,
+                                0x02);
+  TestConnectionCloseWithReason(ReasonForClose::RECEIVED_PACKET_OUT_OF_SEQUENCE,
+                                0x03);
+  TestConnectionCloseWithReason(ReasonForClose::APPLICATION_ERROR, 0x80);
+}
+
+TEST_F(ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest,
+       EncodeDataMessageWithDefaultPacketSizeTest) {
+  std::unique_ptr<BluetoothLowEnergyWeavePacketGenerator> generator =
+      BluetoothLowEnergyWeavePacketGenerator::Factory::NewInstance();
+
+  std::string data = "abcdefghijklmnopqrstuvwxyz";
+
+  std::vector<Packet> packets = generator->EncodeDataMessage(data);
+
+  std::vector<Packet> expected(2);
+
+  // uWeave Header:
+  // 0--- ---- : type = 0 (data packet)
+  // -000 ---- : counter = 0
+  // ---- 1--- : first packet = true
+  // ---- -0-- : last packet = false
+  // ---- --00 : defined by uWeave to be 0
+  // 0000 1000 = 0x08
+  expected[0] = {0x08, 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
+                 'j',  'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's'};
+
+  // uWeave Header:
+  // 0--- ---- : type = 0 (data packet)
+  // -001 ---- : counter = 1
+  // ---- 0--- : first packet = false
+  // ---- -1-- : last packet = true
+  // ---- --00 : defined by uWeave to be 0
+  // 0001 0100 = 0x14
+  expected[1] = {0x14, 't', 'u', 'v', 'w', 'x', 'y', 'z'};
+
+  EXPECT_EQ(expected, packets);
+}
+
+TEST_F(ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest,
+       EncodeDataMessageWithSelectedPacketSizeTest) {
+  std::unique_ptr<BluetoothLowEnergyWeavePacketGenerator> generator =
+      BluetoothLowEnergyWeavePacketGenerator::Factory::NewInstance();
+
+  const uint32_t packet_size = 30;
+  const uint32_t residual_packet_size = 2;
+  std::string a(packet_size - 1, 'a');
+  std::string b(packet_size - 1, 'b');
+  std::string c(residual_packet_size - 1, 'c');
+
+  std::string data = a + b + c;
+
+  generator->SetMaxPacketSize(packet_size);
+
+  std::vector<Packet> packets = generator->EncodeDataMessage(data);
+
+  std::vector<Packet> expected(3);
+
+  expected[0].assign(packet_size, 'a');
+  // uWeave Header:
+  // 0--- ---- : type = 0 (data packet)
+  // -000 ---- : counter = 0
+  // ---- 1--- : first packet = true
+  // ---- -0-- : last packet = false
+  // ---- --00 : defined by uWeave to be 0
+  // 0000 1000 = 0x08
+  expected[0][0] = 0x08;
+
+  expected[1].assign(packet_size, 'b');
+  // uWeave Header:
+  // 0--- ---- : type = 0 (data packet)
+  // -001 ---- : counter = 1
+  // ---- 0--- : first packet = false
+  // ---- -0-- : last packet = false
+  // ---- --00 : defined by uWeave to be 0
+  // 0001 0000 = 0x10
+  expected[1][0] = 0x10;
+
+  expected[2].assign(residual_packet_size, 'c');
+  // uWeave Header:
+  // 0--- ---- : type = 0 (data packet)
+  // -010 ---- : counter = 2
+  // ---- 0--- : first packet = false
+  // ---- -1-- : last packet = true
+  // ---- --00 : defined by uWeave to be 0
+  // 0010 0100 = 0x24
+  expected[2][0] = 0x24;
+
+  EXPECT_EQ(expected, packets);
+}
+
+TEST_F(ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest,
+       PacketCounterForMixedPacketTypesTest) {
+  std::unique_ptr<BluetoothLowEnergyWeavePacketGenerator> generator =
+      BluetoothLowEnergyWeavePacketGenerator::Factory::NewInstance();
+
+  Packet packet = generator->CreateConnectionRequest();
+
+  EXPECT_EQ(0, GetCounterFromHeader(packet[0]));
+
+  std::string data = "a";
+  std::vector<Packet> packets = generator->EncodeDataMessage(data);
+
+  EXPECT_EQ(1, GetCounterFromHeader(packets[0][0]));
+
+  packet = generator->CreateConnectionClose(ReasonForClose::UNKNOWN_ERROR);
+
+  EXPECT_EQ(2, GetCounterFromHeader(packet[0]));
+}
+
+TEST_F(ProximityAuthBluetoothLowEnergyWeavePacketGeneratorTest,
+       PacketCounterWrappedAroundTest) {
+  std::unique_ptr<BluetoothLowEnergyWeavePacketGenerator> generator =
+      BluetoothLowEnergyWeavePacketGenerator::Factory::NewInstance();
+
+  const uint8_t kNumPackets = 100;
+  std::string data(kNumPackets * kDefaultPacketSize, 'a');
+
+  std::vector<Packet> packets = generator->EncodeDataMessage(data);
+
+  std::vector<Packet> expected(kNumPackets);
+
+  for (uint8_t i = 0; i < kNumPackets; ++i) {
+    uint8_t header = packets[i][0];
+    EXPECT_EQ(i % kMaxCounter, GetCounterFromHeader(header));
+    EXPECT_EQ(kDataType, GetPacketType(header));
+  }
+}
+
+}  // namespace proximity_auth