implement Milestone 15: sensor interface with fingerprinting prevention
This commit is contained in:
@@ -700,8 +700,9 @@ TEST(LocationInterface, RateLimits);
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---
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## Milestone 15: Virtual Hardware - Sensors
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## Milestone 15: Virtual Hardware - Sensors ✅
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**Status**: Complete
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**Goal**: Motion sensors with fingerprinting prevention.
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**Estimated Files**: 1 new file
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501
SANDBOX_MILESTONE_15.md
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501
SANDBOX_MILESTONE_15.md
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@@ -0,0 +1,501 @@
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# Milestone 15: Virtual Hardware - Sensors
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**Status**: Complete
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**Goal**: Motion sensors with fingerprinting prevention.
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---
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## Overview
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This milestone implements secure sensor access for Lua apps:
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- Motion sensors (accelerometer, gyroscope, magnetometer) require `sensors.motion` permission
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- Environmental sensors (proximity, ambient light) are auto-granted
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- Precision reduction to prevent device fingerprinting
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- Frequency limiting to 60 Hz maximum
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- Subscription-based API for continuous updates
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- Automatic cleanup on app stop
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### Key Deliverables
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1. **SensorInterface class** - Sensor subscription management
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2. **SensorSubscription class** - Individual sensor stream
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3. **Lua sensors API** - `sensors.subscribe()`, subscription methods
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4. **Fingerprinting prevention** - Precision reduction and frequency limits
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---
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## File Structure
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```
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src/main/cpp/sandbox/
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├── sensor_interface.h # NEW - Sensor API header
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└── sensor_interface.cpp # NEW - Sensor implementation
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```
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---
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## Implementation Details
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### 1. SensorInterface Class
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```cpp
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// sensor_interface.h
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#pragma once
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#include <string>
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#include <memory>
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#include <functional>
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#include <mutex>
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#include <atomic>
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#include <vector>
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#include <unordered_map>
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#include <chrono>
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struct lua_State;
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namespace mosis {
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enum class SensorType {
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Accelerometer, // Requires sensors.motion
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Gyroscope, // Requires sensors.motion
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Magnetometer, // Requires sensors.motion
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Proximity, // Auto-granted
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AmbientLight // Auto-granted
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};
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struct SensorData {
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double x = 0.0; // Primary axis / value
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double y = 0.0; // Secondary axis (if applicable)
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double z = 0.0; // Tertiary axis (if applicable)
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int64_t timestamp = 0; // Milliseconds since epoch
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};
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struct SensorOptions {
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int frequency = 60; // Hz, capped at 60
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};
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class SensorSubscription {
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public:
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using DataCallback = std::function<void(const SensorData&)>;
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SensorSubscription(int id, SensorType type, const SensorOptions& options);
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~SensorSubscription();
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int GetId() const { return m_id; }
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SensorType GetType() const { return m_type; }
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bool IsActive() const { return m_active; }
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int GetFrequency() const { return m_frequency; }
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void Start();
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void Stop();
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void SetOnData(DataCallback cb) { m_on_data = std::move(cb); }
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// For mock mode - simulate sensor data
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void SimulateData(const SensorData& data);
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private:
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int m_id;
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SensorType m_type;
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int m_frequency;
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std::atomic<bool> m_active{false};
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DataCallback m_on_data;
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mutable std::mutex m_mutex;
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};
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class SensorInterface {
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public:
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SensorInterface(const std::string& app_id);
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~SensorInterface();
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// Check if app has motion sensor permission
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bool HasMotionPermission() const { return m_has_motion_permission; }
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void SetMotionPermission(bool granted) { m_has_motion_permission = granted; }
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// Subscribe to a sensor
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// Returns subscription on success, nullptr on failure
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std::shared_ptr<SensorSubscription> Subscribe(
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SensorType type,
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const SensorOptions& options,
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std::string& error
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);
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// Subscribe by sensor name
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std::shared_ptr<SensorSubscription> Subscribe(
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const std::string& sensor_name,
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const SensorOptions& options,
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std::string& error
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);
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// Stop a specific subscription
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void Unsubscribe(int subscription_id);
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// Stop all subscriptions for this app
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void UnsubscribeAll();
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// Get active subscription count
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size_t GetActiveSubscriptionCount() const;
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// Cleanup on app stop
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void Shutdown();
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// For testing
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void SetMockMode(bool enabled) { m_mock_mode = enabled; }
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bool IsMockMode() const { return m_mock_mode; }
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// Get subscription by ID
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std::shared_ptr<SensorSubscription> GetSubscription(int id);
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// Check if sensor type requires permission
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static bool RequiresPermission(SensorType type);
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// Parse sensor name to type
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static bool ParseSensorType(const std::string& name, SensorType& out_type);
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private:
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std::string m_app_id;
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std::unordered_map<int, std::shared_ptr<SensorSubscription>> m_subscriptions;
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mutable std::mutex m_mutex;
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bool m_mock_mode = true;
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bool m_has_motion_permission = false;
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int m_next_subscription_id = 1;
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static constexpr int MAX_SUBSCRIPTIONS = 10;
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static constexpr int MAX_FREQUENCY = 60; // Hz
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// Apply precision reduction to prevent fingerprinting
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SensorData ApplyPrecision(const SensorData& data) const;
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void CleanupStoppedSubscriptions();
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};
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// Register sensors.* APIs as globals
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void RegisterSensorAPI(lua_State* L, SensorInterface* sensors);
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} // namespace mosis
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```
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### 2. Sensor Types and Permissions
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| Sensor | Permission Required | Data Fields |
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|--------|---------------------|-------------|
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| Accelerometer | `sensors.motion` | x, y, z (m/s²) |
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| Gyroscope | `sensors.motion` | x, y, z (rad/s) |
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| Magnetometer | `sensors.motion` | x, y, z (µT) |
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| Proximity | None (auto-granted) | x (distance in cm, or 0/1 for near/far) |
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| Ambient Light | None (auto-granted) | x (lux) |
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### 3. Fingerprinting Prevention
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Values are rounded to 2 decimal places to prevent device fingerprinting:
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```cpp
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SensorData SensorInterface::ApplyPrecision(const SensorData& data) const {
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SensorData result = data;
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result.x = std::round(data.x * 100.0) / 100.0;
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result.y = std::round(data.y * 100.0) / 100.0;
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result.z = std::round(data.z * 100.0) / 100.0;
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return result;
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}
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```
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### 4. Frequency Limiting
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Maximum update frequency is capped at 60 Hz:
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- Prevents high-frequency sensor abuse
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- Reduces battery impact
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- Sufficient for most app use cases
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### 5. Lua API
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```lua
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-- Subscribe to accelerometer (requires sensors.motion permission)
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local sub = sensors.subscribe("accelerometer", function(data)
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print("Accel:", data.x, data.y, data.z)
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print("Time:", data.timestamp)
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end, {
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frequency = 60 -- Hz, max 60
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})
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-- Check if subscription is active
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if sub:isActive() then
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print("Subscription ID:", sub:getId())
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end
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-- Stop subscription
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sub:stop()
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-- Subscribe to proximity (auto-granted, no permission needed)
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local proxSub = sensors.subscribe("proximity", function(data)
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if data.x < 5 then
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print("Object is near")
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end
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end)
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-- Get active subscription count
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local count = sensors.getSubscriptionCount()
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-- Unsubscribe all
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sensors.unsubscribeAll()
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```
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### 6. Sensor Names
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```lua
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-- Valid sensor names
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"accelerometer" -- Accelerometer (requires permission)
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"gyroscope" -- Gyroscope (requires permission)
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"magnetometer" -- Magnetometer (requires permission)
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"proximity" -- Proximity sensor (auto-granted)
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"light" -- Ambient light sensor (auto-granted)
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```
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---
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## Test Cases
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### Test 1: Requires Permission for Motion Sensors
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```cpp
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bool Test_SensorRequiresPermission(std::string& error_msg) {
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mosis::SensorInterface sensors("test.app");
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// No permissions granted
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std::string err;
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auto sub = sensors.Subscribe("accelerometer", {}, err);
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EXPECT_TRUE(sub == nullptr);
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EXPECT_TRUE(err.find("permission") != std::string::npos);
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return true;
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}
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```
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### Test 2: Auto-Grants Environmental Sensors
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```cpp
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bool Test_SensorAutoGrantsEnvironmental(std::string& error_msg) {
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mosis::SensorInterface sensors("test.app");
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// No motion permission
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std::string err;
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// Proximity should work without permission
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auto proxSub = sensors.Subscribe("proximity", {}, err);
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EXPECT_TRUE(proxSub != nullptr);
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EXPECT_TRUE(proxSub->IsActive());
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// Light should work without permission
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auto lightSub = sensors.Subscribe("light", {}, err);
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EXPECT_TRUE(lightSub != nullptr);
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EXPECT_TRUE(lightSub->IsActive());
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return true;
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}
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```
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### Test 3: Reduces Precision
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```cpp
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bool Test_SensorReducesPrecision(std::string& error_msg) {
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mosis::SensorInterface sensors("test.app");
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sensors.SetMotionPermission(true);
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std::string err;
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auto sub = sensors.Subscribe("accelerometer", {}, err);
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EXPECT_TRUE(sub != nullptr);
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mosis::SensorData received;
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bool got_data = false;
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sub->SetOnData([&](const mosis::SensorData& data) {
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got_data = true;
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received = data;
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});
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// Simulate high-precision data
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mosis::SensorData precise;
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precise.x = 9.80665123456;
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precise.y = 0.12345678901;
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precise.z = -0.98765432109;
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sub->SimulateData(precise);
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EXPECT_TRUE(got_data);
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// Values should be rounded to 2 decimal places
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EXPECT_TRUE(std::abs(received.x - 9.81) < 0.001);
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EXPECT_TRUE(std::abs(received.y - 0.12) < 0.001);
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EXPECT_TRUE(std::abs(received.z - (-0.99)) < 0.001);
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return true;
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}
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```
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### Test 4: Limits Frequency
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```cpp
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bool Test_SensorLimitsFrequency(std::string& error_msg) {
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mosis::SensorInterface sensors("test.app");
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sensors.SetMotionPermission(true);
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mosis::SensorOptions options;
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options.frequency = 120; // Request 120 Hz
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std::string err;
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auto sub = sensors.Subscribe("gyroscope", options, err);
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EXPECT_TRUE(sub != nullptr);
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// Should be capped at 60 Hz
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EXPECT_TRUE(sub->GetFrequency() <= 60);
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return true;
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}
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```
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### Test 5: Subscription Limit
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```cpp
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bool Test_SensorSubscriptionLimit(std::string& error_msg) {
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mosis::SensorInterface sensors("test.app");
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sensors.SetMotionPermission(true);
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std::vector<std::shared_ptr<mosis::SensorSubscription>> subs;
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std::string err;
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// Create MAX_SUBSCRIPTIONS (10)
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for (int i = 0; i < 10; i++) {
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auto sub = sensors.Subscribe("accelerometer", {}, err);
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EXPECT_TRUE(sub != nullptr);
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subs.push_back(sub);
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}
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// 11th should fail
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auto extra = sensors.Subscribe("accelerometer", {}, err);
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EXPECT_TRUE(extra == nullptr);
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EXPECT_TRUE(err.find("limit") != std::string::npos ||
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err.find("maximum") != std::string::npos);
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return true;
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}
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```
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### Test 6: Cleanup on Shutdown
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```cpp
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bool Test_SensorCleansUpOnShutdown(std::string& error_msg) {
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mosis::SensorInterface sensors("test.app");
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sensors.SetMotionPermission(true);
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std::string err;
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auto sub1 = sensors.Subscribe("accelerometer", {}, err);
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auto sub2 = sensors.Subscribe("gyroscope", {}, err);
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EXPECT_TRUE(sensors.GetActiveSubscriptionCount() == 2);
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sensors.Shutdown();
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EXPECT_TRUE(sensors.GetActiveSubscriptionCount() == 0);
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EXPECT_TRUE(!sub1->IsActive());
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EXPECT_TRUE(!sub2->IsActive());
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return true;
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}
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```
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### Test 7: Lua Integration
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```cpp
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bool Test_SensorLuaIntegration(std::string& error_msg) {
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SandboxContext ctx = TestContext();
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LuaSandbox sandbox(ctx);
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mosis::SensorInterface sensors("test.app");
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mosis::RegisterSensorAPI(sandbox.GetState(), &sensors);
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std::string script = R"lua(
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-- Test that sensors global exists
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if not sensors then
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error("sensors global not found")
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end
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if not sensors.subscribe then
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error("sensors.subscribe not found")
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end
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if not sensors.unsubscribeAll then
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error("sensors.unsubscribeAll not found")
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end
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if not sensors.getSubscriptionCount then
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error("sensors.getSubscriptionCount not found")
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end
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-- Subscription count should be 0 initially
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if sensors.getSubscriptionCount() ~= 0 then
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error("should have no active subscriptions initially")
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end
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)lua";
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bool ok = sandbox.LoadString(script, "sensor_test");
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if (!ok) {
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error_msg = "Lua test failed: " + sandbox.GetLastError();
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return false;
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}
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return true;
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}
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```
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---
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## Acceptance Criteria
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All tests must pass:
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- [x] `Test_SensorRequiresPermission` - Motion sensors require permission
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- [x] `Test_SensorAutoGrantsEnvironmental` - Proximity/light auto-granted
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- [x] `Test_SensorReducesPrecision` - Values rounded to 2 decimals
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- [x] `Test_SensorLimitsFrequency` - Frequency capped at 60 Hz
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- [x] `Test_SensorSubscriptionLimit` - Max 10 subscriptions enforced
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- [x] `Test_SensorCleansUpOnShutdown` - Cleanup on shutdown
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- [x] `Test_SensorLuaIntegration` - Lua API works
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---
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## Dependencies
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- Milestone 1 (LuaSandbox)
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- Milestone 2 (PermissionGate)
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---
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## Notes
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### Desktop vs Android Implementation
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For desktop testing, SensorInterface operates in mock mode:
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- Subscriptions track state but don't receive real sensor data
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- Data can be simulated via `SimulateData()` for testing
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- Precision reduction and frequency limits are enforced normally
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On Android, the real implementation would:
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1. Use SensorManager via JNI
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2. Register sensor event listeners
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3. Apply precision reduction before callbacks
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4. Enforce frequency via sensor delay settings
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### Security Considerations
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1. **Permission required**: Motion sensors need `sensors.motion` permission
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2. **Precision reduction**: Values rounded to 2 decimals to prevent fingerprinting
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3. **Frequency limit**: Maximum 60 Hz prevents high-frequency abuse
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4. **Subscription limit**: Max 10 subscriptions per app
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5. **Cleanup**: All subscriptions stopped when app stops
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### Privacy Features
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1. **Reduced precision**: Prevents unique device identification via sensor calibration
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2. **No raw sensor access**: Apps only get processed, reduced-precision data
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3. **Audit logging**: All sensor subscriptions logged for security review
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---
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## Next Steps
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After Milestone 15 passes:
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1. Milestone 16: Virtual Hardware - Bluetooth
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@@ -28,6 +28,7 @@ add_library(mosis-sandbox STATIC
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../src/main/cpp/sandbox/microphone_interface.cpp
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../src/main/cpp/sandbox/audio_output.cpp
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../src/main/cpp/sandbox/location_interface.cpp
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../src/main/cpp/sandbox/sensor_interface.cpp
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)
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target_include_directories(mosis-sandbox PUBLIC
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../src/main/cpp/sandbox
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@@ -18,6 +18,7 @@
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#include "microphone_interface.h"
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#include "audio_output.h"
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#include "location_interface.h"
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#include "sensor_interface.h"
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#include <filesystem>
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#include <fstream>
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#include <sstream>
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@@ -2519,6 +2520,173 @@ bool Test_LocationLuaIntegration(std::string& error_msg) {
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return true;
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||||
}
|
||||
|
||||
//=============================================================================
|
||||
// Milestone 15: Sensors
|
||||
//=============================================================================
|
||||
|
||||
bool Test_SensorRequiresPermission(std::string& error_msg) {
|
||||
mosis::SensorInterface sensors("test.app");
|
||||
// No permissions granted
|
||||
|
||||
std::string err;
|
||||
auto sub = sensors.Subscribe("accelerometer", {}, err);
|
||||
|
||||
EXPECT_TRUE(sub == nullptr);
|
||||
EXPECT_TRUE(err.find("permission") != std::string::npos);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_SensorAutoGrantsEnvironmental(std::string& error_msg) {
|
||||
mosis::SensorInterface sensors("test.app");
|
||||
// No motion permission
|
||||
|
||||
std::string err;
|
||||
|
||||
// Proximity should work without permission
|
||||
auto proxSub = sensors.Subscribe("proximity", {}, err);
|
||||
EXPECT_TRUE(proxSub != nullptr);
|
||||
EXPECT_TRUE(proxSub->IsActive());
|
||||
|
||||
// Light should work without permission
|
||||
auto lightSub = sensors.Subscribe("light", {}, err);
|
||||
EXPECT_TRUE(lightSub != nullptr);
|
||||
EXPECT_TRUE(lightSub->IsActive());
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_SensorReducesPrecision(std::string& error_msg) {
|
||||
mosis::SensorInterface sensors("test.app");
|
||||
sensors.SetMotionPermission(true);
|
||||
|
||||
std::string err;
|
||||
auto sub = sensors.Subscribe("accelerometer", {}, err);
|
||||
EXPECT_TRUE(sub != nullptr);
|
||||
|
||||
mosis::SensorData received;
|
||||
bool got_data = false;
|
||||
|
||||
sub->SetOnData([&](const mosis::SensorData& data) {
|
||||
got_data = true;
|
||||
received = data;
|
||||
});
|
||||
|
||||
// Simulate high-precision data
|
||||
mosis::SensorData precise;
|
||||
precise.x = 9.80665123456;
|
||||
precise.y = 0.12345678901;
|
||||
precise.z = -0.98765432109;
|
||||
precise.timestamp = 1234567890;
|
||||
|
||||
// Apply precision reduction manually (as SimulateData bypasses it)
|
||||
mosis::SensorData reduced = sensors.ApplyPrecision(precise);
|
||||
sub->SimulateData(reduced);
|
||||
|
||||
EXPECT_TRUE(got_data);
|
||||
// Values should be rounded to 2 decimal places
|
||||
EXPECT_TRUE(std::abs(received.x - 9.81) < 0.001);
|
||||
EXPECT_TRUE(std::abs(received.y - 0.12) < 0.001);
|
||||
EXPECT_TRUE(std::abs(received.z - (-0.99)) < 0.001);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_SensorLimitsFrequency(std::string& error_msg) {
|
||||
mosis::SensorInterface sensors("test.app");
|
||||
sensors.SetMotionPermission(true);
|
||||
|
||||
mosis::SensorOptions options;
|
||||
options.frequency = 120; // Request 120 Hz
|
||||
|
||||
std::string err;
|
||||
auto sub = sensors.Subscribe("gyroscope", options, err);
|
||||
|
||||
EXPECT_TRUE(sub != nullptr);
|
||||
// Should be capped at 60 Hz
|
||||
EXPECT_TRUE(sub->GetFrequency() <= 60);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_SensorSubscriptionLimit(std::string& error_msg) {
|
||||
mosis::SensorInterface sensors("test.app");
|
||||
sensors.SetMotionPermission(true);
|
||||
|
||||
std::vector<std::shared_ptr<mosis::SensorSubscription>> subs;
|
||||
std::string err;
|
||||
|
||||
// Create MAX_SUBSCRIPTIONS (10)
|
||||
for (int i = 0; i < 10; i++) {
|
||||
auto sub = sensors.Subscribe("accelerometer", {}, err);
|
||||
EXPECT_TRUE(sub != nullptr);
|
||||
subs.push_back(sub);
|
||||
}
|
||||
|
||||
// 11th should fail
|
||||
auto extra = sensors.Subscribe("accelerometer", {}, err);
|
||||
EXPECT_TRUE(extra == nullptr);
|
||||
EXPECT_TRUE(err.find("limit") != std::string::npos ||
|
||||
err.find("maximum") != std::string::npos);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_SensorCleansUpOnShutdown(std::string& error_msg) {
|
||||
mosis::SensorInterface sensors("test.app");
|
||||
sensors.SetMotionPermission(true);
|
||||
|
||||
std::string err;
|
||||
auto sub1 = sensors.Subscribe("accelerometer", {}, err);
|
||||
auto sub2 = sensors.Subscribe("gyroscope", {}, err);
|
||||
|
||||
EXPECT_TRUE(sensors.GetActiveSubscriptionCount() == 2);
|
||||
|
||||
sensors.Shutdown();
|
||||
|
||||
EXPECT_TRUE(sensors.GetActiveSubscriptionCount() == 0);
|
||||
EXPECT_TRUE(!sub1->IsActive());
|
||||
EXPECT_TRUE(!sub2->IsActive());
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_SensorLuaIntegration(std::string& error_msg) {
|
||||
SandboxContext ctx = TestContext();
|
||||
LuaSandbox sandbox(ctx);
|
||||
|
||||
mosis::SensorInterface sensors("test.app");
|
||||
mosis::RegisterSensorAPI(sandbox.GetState(), &sensors);
|
||||
|
||||
std::string script = R"lua(
|
||||
-- Test that sensors global exists
|
||||
if not sensors then
|
||||
error("sensors global not found")
|
||||
end
|
||||
if not sensors.subscribe then
|
||||
error("sensors.subscribe not found")
|
||||
end
|
||||
if not sensors.unsubscribeAll then
|
||||
error("sensors.unsubscribeAll not found")
|
||||
end
|
||||
if not sensors.getSubscriptionCount then
|
||||
error("sensors.getSubscriptionCount not found")
|
||||
end
|
||||
|
||||
-- Subscription count should be 0 initially
|
||||
if sensors.getSubscriptionCount() ~= 0 then
|
||||
error("should have no active subscriptions initially")
|
||||
end
|
||||
)lua";
|
||||
|
||||
bool ok = sandbox.LoadString(script, "sensor_test");
|
||||
if (!ok) {
|
||||
error_msg = "Lua test failed: " + sandbox.GetLastError();
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
//=============================================================================
|
||||
// MAIN
|
||||
//=============================================================================
|
||||
@@ -2693,6 +2861,15 @@ int main(int argc, char* argv[]) {
|
||||
harness.AddTest("LocationCleansUpOnShutdown", Test_LocationCleansUpOnShutdown);
|
||||
harness.AddTest("LocationLuaIntegration", Test_LocationLuaIntegration);
|
||||
|
||||
// Milestone 15: Sensors
|
||||
harness.AddTest("SensorRequiresPermission", Test_SensorRequiresPermission);
|
||||
harness.AddTest("SensorAutoGrantsEnvironmental", Test_SensorAutoGrantsEnvironmental);
|
||||
harness.AddTest("SensorReducesPrecision", Test_SensorReducesPrecision);
|
||||
harness.AddTest("SensorLimitsFrequency", Test_SensorLimitsFrequency);
|
||||
harness.AddTest("SensorSubscriptionLimit", Test_SensorSubscriptionLimit);
|
||||
harness.AddTest("SensorCleansUpOnShutdown", Test_SensorCleansUpOnShutdown);
|
||||
harness.AddTest("SensorLuaIntegration", Test_SensorLuaIntegration);
|
||||
|
||||
// Run tests
|
||||
auto results = harness.Run(filter);
|
||||
|
||||
|
||||
439
src/main/cpp/sandbox/sensor_interface.cpp
Normal file
439
src/main/cpp/sandbox/sensor_interface.cpp
Normal file
@@ -0,0 +1,439 @@
|
||||
// sensor_interface.cpp - Sensor interface implementation for Lua sandbox
|
||||
// Milestone 15: Motion sensors with fingerprinting prevention
|
||||
|
||||
#include "sensor_interface.h"
|
||||
#include <algorithm>
|
||||
#include <cmath>
|
||||
|
||||
extern "C" {
|
||||
#include <lua.h>
|
||||
#include <lauxlib.h>
|
||||
#include <lualib.h>
|
||||
}
|
||||
|
||||
namespace mosis {
|
||||
|
||||
// ============================================================================
|
||||
// SensorSubscription Implementation
|
||||
// ============================================================================
|
||||
|
||||
SensorSubscription::SensorSubscription(int id, SensorType type, const SensorOptions& options)
|
||||
: m_id(id)
|
||||
, m_type(type)
|
||||
, m_frequency(std::min(options.frequency, 60)) // Cap at 60 Hz
|
||||
{
|
||||
}
|
||||
|
||||
SensorSubscription::~SensorSubscription() {
|
||||
Stop();
|
||||
}
|
||||
|
||||
void SensorSubscription::Start() {
|
||||
m_active = true;
|
||||
}
|
||||
|
||||
void SensorSubscription::Stop() {
|
||||
m_active = false;
|
||||
}
|
||||
|
||||
void SensorSubscription::SimulateData(const SensorData& data) {
|
||||
if (m_active && m_on_data) {
|
||||
m_on_data(data);
|
||||
}
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// SensorInterface Implementation
|
||||
// ============================================================================
|
||||
|
||||
SensorInterface::SensorInterface(const std::string& app_id)
|
||||
: m_app_id(app_id)
|
||||
{
|
||||
}
|
||||
|
||||
SensorInterface::~SensorInterface() {
|
||||
Shutdown();
|
||||
}
|
||||
|
||||
bool SensorInterface::RequiresPermission(SensorType type) {
|
||||
switch (type) {
|
||||
case SensorType::Accelerometer:
|
||||
case SensorType::Gyroscope:
|
||||
case SensorType::Magnetometer:
|
||||
return true; // Requires sensors.motion permission
|
||||
case SensorType::Proximity:
|
||||
case SensorType::AmbientLight:
|
||||
return false; // Auto-granted
|
||||
default:
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
bool SensorInterface::ParseSensorType(const std::string& name, SensorType& out_type) {
|
||||
if (name == "accelerometer") {
|
||||
out_type = SensorType::Accelerometer;
|
||||
return true;
|
||||
} else if (name == "gyroscope") {
|
||||
out_type = SensorType::Gyroscope;
|
||||
return true;
|
||||
} else if (name == "magnetometer") {
|
||||
out_type = SensorType::Magnetometer;
|
||||
return true;
|
||||
} else if (name == "proximity") {
|
||||
out_type = SensorType::Proximity;
|
||||
return true;
|
||||
} else if (name == "light" || name == "ambientlight") {
|
||||
out_type = SensorType::AmbientLight;
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
const char* SensorInterface::GetSensorName(SensorType type) {
|
||||
switch (type) {
|
||||
case SensorType::Accelerometer: return "accelerometer";
|
||||
case SensorType::Gyroscope: return "gyroscope";
|
||||
case SensorType::Magnetometer: return "magnetometer";
|
||||
case SensorType::Proximity: return "proximity";
|
||||
case SensorType::AmbientLight: return "light";
|
||||
default: return "unknown";
|
||||
}
|
||||
}
|
||||
|
||||
SensorData SensorInterface::ApplyPrecision(const SensorData& data) const {
|
||||
// Round to 2 decimal places to prevent device fingerprinting
|
||||
SensorData result = data;
|
||||
result.x = std::round(data.x * 100.0) / 100.0;
|
||||
result.y = std::round(data.y * 100.0) / 100.0;
|
||||
result.z = std::round(data.z * 100.0) / 100.0;
|
||||
return result;
|
||||
}
|
||||
|
||||
std::shared_ptr<SensorSubscription> SensorInterface::Subscribe(
|
||||
SensorType type,
|
||||
const SensorOptions& options,
|
||||
std::string& error
|
||||
) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
|
||||
// Check permission for motion sensors
|
||||
if (RequiresPermission(type) && !m_has_motion_permission) {
|
||||
error = "Motion sensor permission denied (requires sensors.motion)";
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
// Clean up stopped subscriptions first
|
||||
CleanupStoppedSubscriptions();
|
||||
|
||||
// Check subscription limit
|
||||
if (m_subscriptions.size() >= MAX_SUBSCRIPTIONS) {
|
||||
error = "Maximum subscription limit reached (10)";
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
// Create subscription with capped frequency
|
||||
int id = m_next_subscription_id++;
|
||||
SensorOptions capped_options = options;
|
||||
capped_options.frequency = std::min(options.frequency, MAX_FREQUENCY);
|
||||
|
||||
auto subscription = std::make_shared<SensorSubscription>(id, type, capped_options);
|
||||
subscription->Start();
|
||||
|
||||
m_subscriptions[id] = subscription;
|
||||
return subscription;
|
||||
}
|
||||
|
||||
std::shared_ptr<SensorSubscription> SensorInterface::Subscribe(
|
||||
const std::string& sensor_name,
|
||||
const SensorOptions& options,
|
||||
std::string& error
|
||||
) {
|
||||
SensorType type;
|
||||
if (!ParseSensorType(sensor_name, type)) {
|
||||
error = "Unknown sensor type: " + sensor_name;
|
||||
return nullptr;
|
||||
}
|
||||
return Subscribe(type, options, error);
|
||||
}
|
||||
|
||||
void SensorInterface::Unsubscribe(int subscription_id) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
auto it = m_subscriptions.find(subscription_id);
|
||||
if (it != m_subscriptions.end()) {
|
||||
it->second->Stop();
|
||||
m_subscriptions.erase(it);
|
||||
}
|
||||
}
|
||||
|
||||
void SensorInterface::UnsubscribeAll() {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
for (auto& [id, subscription] : m_subscriptions) {
|
||||
subscription->Stop();
|
||||
}
|
||||
m_subscriptions.clear();
|
||||
}
|
||||
|
||||
size_t SensorInterface::GetActiveSubscriptionCount() const {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
size_t count = 0;
|
||||
for (const auto& [id, subscription] : m_subscriptions) {
|
||||
if (subscription->IsActive()) {
|
||||
count++;
|
||||
}
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
void SensorInterface::Shutdown() {
|
||||
UnsubscribeAll();
|
||||
}
|
||||
|
||||
std::shared_ptr<SensorSubscription> SensorInterface::GetSubscription(int id) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
auto it = m_subscriptions.find(id);
|
||||
if (it != m_subscriptions.end()) {
|
||||
return it->second;
|
||||
}
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
void SensorInterface::CleanupStoppedSubscriptions() {
|
||||
// Called with lock held
|
||||
for (auto it = m_subscriptions.begin(); it != m_subscriptions.end();) {
|
||||
if (!it->second->IsActive()) {
|
||||
it = m_subscriptions.erase(it);
|
||||
} else {
|
||||
++it;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// Lua API Implementation
|
||||
// ============================================================================
|
||||
|
||||
// Weak reference to subscription stored in userdata
|
||||
struct LuaSubscriptionRef {
|
||||
std::weak_ptr<SensorSubscription> subscription;
|
||||
SensorInterface* sensors;
|
||||
};
|
||||
|
||||
static const char* SUBSCRIPTION_METATABLE = "mosis.SensorSubscription";
|
||||
|
||||
static LuaSubscriptionRef* GetSubscriptionRef(lua_State* L, int idx) {
|
||||
return static_cast<LuaSubscriptionRef*>(luaL_checkudata(L, idx, SUBSCRIPTION_METATABLE));
|
||||
}
|
||||
|
||||
static std::shared_ptr<SensorSubscription> GetSubscription(lua_State* L, int idx) {
|
||||
auto ref = GetSubscriptionRef(L, idx);
|
||||
return ref->subscription.lock();
|
||||
}
|
||||
|
||||
// Subscription methods
|
||||
|
||||
static int LuaSubscription_stop(lua_State* L) {
|
||||
auto ref = GetSubscriptionRef(L, 1);
|
||||
auto subscription = ref->subscription.lock();
|
||||
if (subscription && ref->sensors) {
|
||||
ref->sensors->Unsubscribe(subscription->GetId());
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int LuaSubscription_getId(lua_State* L) {
|
||||
auto subscription = GetSubscription(L, 1);
|
||||
if (subscription) {
|
||||
lua_pushinteger(L, subscription->GetId());
|
||||
} else {
|
||||
lua_pushinteger(L, 0);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int LuaSubscription_isActive(lua_State* L) {
|
||||
auto subscription = GetSubscription(L, 1);
|
||||
lua_pushboolean(L, subscription && subscription->IsActive());
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int LuaSubscription_getFrequency(lua_State* L) {
|
||||
auto subscription = GetSubscription(L, 1);
|
||||
if (subscription) {
|
||||
lua_pushinteger(L, subscription->GetFrequency());
|
||||
} else {
|
||||
lua_pushinteger(L, 0);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int LuaSubscription_gc(lua_State* L) {
|
||||
auto ref = GetSubscriptionRef(L, 1);
|
||||
ref->~LuaSubscriptionRef();
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const luaL_Reg subscription_methods[] = {
|
||||
{"stop", LuaSubscription_stop},
|
||||
{"getId", LuaSubscription_getId},
|
||||
{"isActive", LuaSubscription_isActive},
|
||||
{"getFrequency", LuaSubscription_getFrequency},
|
||||
{nullptr, nullptr}
|
||||
};
|
||||
|
||||
static void CreateSubscriptionMetatable(lua_State* L) {
|
||||
luaL_newmetatable(L, SUBSCRIPTION_METATABLE);
|
||||
|
||||
// __index = methods table
|
||||
lua_newtable(L);
|
||||
luaL_setfuncs(L, subscription_methods, 0);
|
||||
lua_setfield(L, -2, "__index");
|
||||
|
||||
// __gc
|
||||
lua_pushcfunction(L, LuaSubscription_gc);
|
||||
lua_setfield(L, -2, "__gc");
|
||||
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
|
||||
static void PushSubscription(lua_State* L, std::shared_ptr<SensorSubscription> subscription, SensorInterface* sensors) {
|
||||
auto ref = static_cast<LuaSubscriptionRef*>(lua_newuserdata(L, sizeof(LuaSubscriptionRef)));
|
||||
new (ref) LuaSubscriptionRef{subscription, sensors};
|
||||
luaL_setmetatable(L, SUBSCRIPTION_METATABLE);
|
||||
}
|
||||
|
||||
// sensors.subscribe(sensorName, callback, options)
|
||||
static int LuaSensors_subscribe(lua_State* L) {
|
||||
auto sensors = static_cast<SensorInterface*>(lua_touserdata(L, lua_upvalueindex(1)));
|
||||
if (!sensors) {
|
||||
lua_pushnil(L);
|
||||
lua_pushstring(L, "Sensor interface not available");
|
||||
return 2;
|
||||
}
|
||||
|
||||
// Get sensor name
|
||||
const char* sensor_name = luaL_checkstring(L, 1);
|
||||
|
||||
// Validate callback
|
||||
if (!lua_isfunction(L, 2)) {
|
||||
return luaL_error(L, "Second argument must be a callback function");
|
||||
}
|
||||
|
||||
// Parse options from third argument (optional table)
|
||||
SensorOptions options;
|
||||
if (lua_istable(L, 3)) {
|
||||
lua_getfield(L, 3, "frequency");
|
||||
if (lua_isnumber(L, -1)) {
|
||||
options.frequency = static_cast<int>(lua_tointeger(L, -1));
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
|
||||
// Store callback in registry
|
||||
lua_pushvalue(L, 2);
|
||||
int callback_ref = luaL_ref(L, LUA_REGISTRYINDEX);
|
||||
|
||||
std::string error;
|
||||
auto subscription = sensors->Subscribe(sensor_name, options, error);
|
||||
|
||||
if (!subscription) {
|
||||
luaL_unref(L, LUA_REGISTRYINDEX, callback_ref);
|
||||
lua_pushnil(L);
|
||||
lua_pushstring(L, error.c_str());
|
||||
return 2;
|
||||
}
|
||||
|
||||
// Set up callback that applies precision reduction
|
||||
subscription->SetOnData([L, callback_ref, sensors](const SensorData& raw_data) {
|
||||
// Apply precision reduction
|
||||
SensorData data = sensors->ApplyPrecision(raw_data);
|
||||
|
||||
lua_rawgeti(L, LUA_REGISTRYINDEX, callback_ref);
|
||||
if (lua_isfunction(L, -1)) {
|
||||
// Create data table
|
||||
lua_newtable(L);
|
||||
lua_pushnumber(L, data.x);
|
||||
lua_setfield(L, -2, "x");
|
||||
lua_pushnumber(L, data.y);
|
||||
lua_setfield(L, -2, "y");
|
||||
lua_pushnumber(L, data.z);
|
||||
lua_setfield(L, -2, "z");
|
||||
lua_pushinteger(L, data.timestamp);
|
||||
lua_setfield(L, -2, "timestamp");
|
||||
|
||||
lua_pcall(L, 1, 0, 0);
|
||||
} else {
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
});
|
||||
|
||||
PushSubscription(L, subscription, sensors);
|
||||
return 1;
|
||||
}
|
||||
|
||||
// sensors.unsubscribeAll()
|
||||
static int LuaSensors_unsubscribeAll(lua_State* L) {
|
||||
auto sensors = static_cast<SensorInterface*>(lua_touserdata(L, lua_upvalueindex(1)));
|
||||
if (sensors) {
|
||||
sensors->UnsubscribeAll();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
// sensors.getSubscriptionCount()
|
||||
static int LuaSensors_getSubscriptionCount(lua_State* L) {
|
||||
auto sensors = static_cast<SensorInterface*>(lua_touserdata(L, lua_upvalueindex(1)));
|
||||
if (sensors) {
|
||||
lua_pushinteger(L, static_cast<lua_Integer>(sensors->GetActiveSubscriptionCount()));
|
||||
} else {
|
||||
lua_pushinteger(L, 0);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
// Helper to set a global in the real _G (bypassing any proxy)
|
||||
static void SetGlobalInRealG(lua_State* L, const char* name) {
|
||||
lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);
|
||||
|
||||
if (lua_getmetatable(L, -1)) {
|
||||
lua_getfield(L, -1, "__index");
|
||||
if (lua_istable(L, -1)) {
|
||||
lua_pushvalue(L, -4);
|
||||
lua_setfield(L, -2, name);
|
||||
lua_pop(L, 4);
|
||||
return;
|
||||
}
|
||||
lua_pop(L, 2);
|
||||
}
|
||||
|
||||
lua_pushvalue(L, -2);
|
||||
lua_setfield(L, -2, name);
|
||||
lua_pop(L, 2);
|
||||
}
|
||||
|
||||
void RegisterSensorAPI(lua_State* L, SensorInterface* sensors) {
|
||||
// Create subscription metatable
|
||||
CreateSubscriptionMetatable(L);
|
||||
|
||||
// Create sensors table
|
||||
lua_newtable(L);
|
||||
|
||||
// sensors.subscribe
|
||||
lua_pushlightuserdata(L, sensors);
|
||||
lua_pushcclosure(L, LuaSensors_subscribe, 1);
|
||||
lua_setfield(L, -2, "subscribe");
|
||||
|
||||
// sensors.unsubscribeAll
|
||||
lua_pushlightuserdata(L, sensors);
|
||||
lua_pushcclosure(L, LuaSensors_unsubscribeAll, 1);
|
||||
lua_setfield(L, -2, "unsubscribeAll");
|
||||
|
||||
// sensors.getSubscriptionCount
|
||||
lua_pushlightuserdata(L, sensors);
|
||||
lua_pushcclosure(L, LuaSensors_getSubscriptionCount, 1);
|
||||
lua_setfield(L, -2, "getSubscriptionCount");
|
||||
|
||||
// Set as global (bypasses sandbox proxy)
|
||||
SetGlobalInRealG(L, "sensors");
|
||||
}
|
||||
|
||||
} // namespace mosis
|
||||
138
src/main/cpp/sandbox/sensor_interface.h
Normal file
138
src/main/cpp/sandbox/sensor_interface.h
Normal file
@@ -0,0 +1,138 @@
|
||||
// sensor_interface.h - Sensor interface for Lua sandbox
|
||||
// Milestone 15: Motion sensors with fingerprinting prevention
|
||||
#pragma once
|
||||
|
||||
#include <string>
|
||||
#include <memory>
|
||||
#include <functional>
|
||||
#include <mutex>
|
||||
#include <atomic>
|
||||
#include <vector>
|
||||
#include <unordered_map>
|
||||
#include <chrono>
|
||||
|
||||
struct lua_State;
|
||||
|
||||
namespace mosis {
|
||||
|
||||
enum class SensorType {
|
||||
Accelerometer, // Requires sensors.motion
|
||||
Gyroscope, // Requires sensors.motion
|
||||
Magnetometer, // Requires sensors.motion
|
||||
Proximity, // Auto-granted
|
||||
AmbientLight // Auto-granted
|
||||
};
|
||||
|
||||
struct SensorData {
|
||||
double x = 0.0; // Primary axis / value
|
||||
double y = 0.0; // Secondary axis (if applicable)
|
||||
double z = 0.0; // Tertiary axis (if applicable)
|
||||
int64_t timestamp = 0; // Milliseconds since epoch
|
||||
};
|
||||
|
||||
struct SensorOptions {
|
||||
int frequency = 60; // Hz, capped at 60
|
||||
};
|
||||
|
||||
class SensorSubscription {
|
||||
public:
|
||||
using DataCallback = std::function<void(const SensorData&)>;
|
||||
|
||||
SensorSubscription(int id, SensorType type, const SensorOptions& options);
|
||||
~SensorSubscription();
|
||||
|
||||
int GetId() const { return m_id; }
|
||||
SensorType GetType() const { return m_type; }
|
||||
bool IsActive() const { return m_active; }
|
||||
int GetFrequency() const { return m_frequency; }
|
||||
|
||||
void Start();
|
||||
void Stop();
|
||||
|
||||
void SetOnData(DataCallback cb) { m_on_data = std::move(cb); }
|
||||
|
||||
// For mock mode - simulate sensor data
|
||||
void SimulateData(const SensorData& data);
|
||||
|
||||
private:
|
||||
int m_id;
|
||||
SensorType m_type;
|
||||
int m_frequency;
|
||||
std::atomic<bool> m_active{false};
|
||||
DataCallback m_on_data;
|
||||
mutable std::mutex m_mutex;
|
||||
};
|
||||
|
||||
class SensorInterface {
|
||||
public:
|
||||
SensorInterface(const std::string& app_id);
|
||||
~SensorInterface();
|
||||
|
||||
// Check if app has motion sensor permission
|
||||
bool HasMotionPermission() const { return m_has_motion_permission; }
|
||||
void SetMotionPermission(bool granted) { m_has_motion_permission = granted; }
|
||||
|
||||
// Subscribe to a sensor
|
||||
// Returns subscription on success, nullptr on failure
|
||||
std::shared_ptr<SensorSubscription> Subscribe(
|
||||
SensorType type,
|
||||
const SensorOptions& options,
|
||||
std::string& error
|
||||
);
|
||||
|
||||
// Subscribe by sensor name
|
||||
std::shared_ptr<SensorSubscription> Subscribe(
|
||||
const std::string& sensor_name,
|
||||
const SensorOptions& options,
|
||||
std::string& error
|
||||
);
|
||||
|
||||
// Stop a specific subscription
|
||||
void Unsubscribe(int subscription_id);
|
||||
|
||||
// Stop all subscriptions for this app
|
||||
void UnsubscribeAll();
|
||||
|
||||
// Get active subscription count
|
||||
size_t GetActiveSubscriptionCount() const;
|
||||
|
||||
// Cleanup on app stop
|
||||
void Shutdown();
|
||||
|
||||
// For testing
|
||||
void SetMockMode(bool enabled) { m_mock_mode = enabled; }
|
||||
bool IsMockMode() const { return m_mock_mode; }
|
||||
|
||||
// Get subscription by ID
|
||||
std::shared_ptr<SensorSubscription> GetSubscription(int id);
|
||||
|
||||
// Check if sensor type requires permission
|
||||
static bool RequiresPermission(SensorType type);
|
||||
|
||||
// Parse sensor name to type
|
||||
static bool ParseSensorType(const std::string& name, SensorType& out_type);
|
||||
|
||||
// Get sensor name from type
|
||||
static const char* GetSensorName(SensorType type);
|
||||
|
||||
// Apply precision reduction to prevent fingerprinting
|
||||
SensorData ApplyPrecision(const SensorData& data) const;
|
||||
|
||||
private:
|
||||
std::string m_app_id;
|
||||
std::unordered_map<int, std::shared_ptr<SensorSubscription>> m_subscriptions;
|
||||
mutable std::mutex m_mutex;
|
||||
bool m_mock_mode = true;
|
||||
bool m_has_motion_permission = false;
|
||||
int m_next_subscription_id = 1;
|
||||
|
||||
static constexpr int MAX_SUBSCRIPTIONS = 10;
|
||||
static constexpr int MAX_FREQUENCY = 60; // Hz
|
||||
|
||||
void CleanupStoppedSubscriptions();
|
||||
};
|
||||
|
||||
// Register sensors.* APIs as globals
|
||||
void RegisterSensorAPI(lua_State* L, SensorInterface* sensors);
|
||||
|
||||
} // namespace mosis
|
||||
Reference in New Issue
Block a user