implement Milestone 18: inter-app MessageBus with intent system
This commit is contained in:
@@ -838,9 +838,10 @@ TEST(ContactsInterface, RequiresWritePermission);
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---
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## Milestone 18: Inter-App Communication
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## ✅ Milestone 18: Inter-App Communication
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**Goal**: Kernel-mediated message passing.
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**Status**: Complete
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**Estimated Files**: 1 new file
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### Deliverables
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463
SANDBOX_MILESTONE_18.md
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463
SANDBOX_MILESTONE_18.md
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@@ -0,0 +1,463 @@
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# Milestone 18: Inter-App Communication
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**Status**: Complete
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**Goal**: Kernel-mediated message passing between apps.
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---
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## Overview
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This milestone implements secure inter-app communication via an intent system:
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- Apps register to receive specific intent actions
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- Senders must have required permissions
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- All messages go through kernel mediation (no direct app-to-app)
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- Message size limits prevent resource exhaustion
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- Audit logging for all inter-app communication
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### Key Deliverables
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1. **MessageBus class** - Central message routing and validation
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2. **Intent struct** - Message format with action, type, and data
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3. **Lua intents API** - `intents.send()`, `intents.on()`, `intents.broadcast()`
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4. **Security validation** - Permission checks, sender/receiver verification
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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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├── message_bus.h # NEW - Message bus API header
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└── message_bus.cpp # NEW - Message bus implementation
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```
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---
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## Implementation Details
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### 1. MessageBus Class
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```cpp
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// message_bus.h
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#pragma once
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#include <string>
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#include <vector>
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#include <functional>
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#include <mutex>
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#include <unordered_map>
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#include <unordered_set>
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struct lua_State;
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namespace mosis {
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struct Intent {
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std::string action; // Intent action (e.g., "share", "view", "edit")
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std::string type; // MIME type (e.g., "text/plain", "image/png")
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std::string data; // Intent data/payload
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std::string from_app; // Sender app ID (set by kernel)
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};
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struct IntentFilter {
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std::string action; // Required action
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std::vector<std::string> types; // Accepted MIME types (empty = all)
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};
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enum class MessageError {
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None,
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NoReceivers,
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PermissionDenied,
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InvalidIntent,
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DataTooLarge,
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ReceiverNotFound,
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SenderBlocked
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};
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class MessageBus {
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public:
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using IntentHandler = std::function<void(const Intent&)>;
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MessageBus();
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~MessageBus();
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// Register an app to receive intents
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void RegisterReceiver(
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const std::string& app_id,
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const IntentFilter& filter,
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IntentHandler handler
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);
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// Unregister all handlers for an app
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void UnregisterApp(const std::string& app_id);
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// Send intent to specific app (requires permission)
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MessageError Send(
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const std::string& sender_app,
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const std::string& target_app,
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const Intent& intent,
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std::string& error
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);
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// Broadcast intent to all registered receivers
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MessageError Broadcast(
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const std::string& sender_app,
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const Intent& intent,
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std::string& error
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);
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// Check if any app handles this action
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bool HasReceiverFor(const std::string& action) const;
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// Get list of apps that handle an action
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std::vector<std::string> GetReceiversFor(const std::string& action) const;
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// Permission management
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void SetAppPermission(const std::string& app_id, const std::string& permission, bool granted);
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bool HasPermission(const std::string& app_id, const std::string& permission) const;
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// Block specific app from sending/receiving
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void BlockApp(const std::string& app_id);
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void UnblockApp(const std::string& app_id);
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bool IsBlocked(const std::string& app_id) const;
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// Clear all registrations (for testing)
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void Clear();
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// Statistics
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size_t GetReceiverCount() const;
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size_t GetMessageCount() const { return m_message_count; }
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private:
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struct ReceiverEntry {
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std::string app_id;
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IntentFilter filter;
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IntentHandler handler;
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};
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std::vector<ReceiverEntry> m_receivers;
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std::unordered_map<std::string, std::unordered_set<std::string>> m_permissions;
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std::unordered_set<std::string> m_blocked_apps;
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mutable std::mutex m_mutex;
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size_t m_message_count = 0;
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static constexpr size_t MAX_DATA_SIZE = 1024 * 1024; // 1MB max
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bool MatchesFilter(const Intent& intent, const IntentFilter& filter) const;
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bool ValidateIntent(const Intent& intent, std::string& error) const;
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};
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// Register intents.* APIs as globals
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void RegisterIntentsAPI(lua_State* L, MessageBus* bus, const std::string& app_id);
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} // namespace mosis
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```
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### 2. Standard Intent Actions
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| Action | Description | Required Permission |
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|--------|-------------|---------------------|
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| `share` | Share content with another app | None |
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| `view` | Request app to view content | None |
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| `edit` | Request app to edit content | None |
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| `pick` | Request user to pick item | None |
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| `call` | Initiate phone call | `phone.call` |
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| `message` | Send SMS/message | `sms.send` |
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| `email` | Compose email | None |
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### 3. Permission Requirements
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| Operation | Permission Required |
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|-----------|---------------------|
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| Send intent | Action-specific (see above) |
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| Broadcast intent | Action-specific |
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| Register receiver | None |
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| Receive intent | None |
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### 4. Lua API
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```lua
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-- Register to receive intents
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intents.on("share", function(intent)
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print("Received share from:", intent.from)
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print("Type:", intent.type)
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print("Data:", intent.data)
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end)
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-- Register with MIME type filter
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intents.on("view", function(intent)
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-- Handle view intent
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end, {types = {"image/png", "image/jpeg"}})
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-- Send intent to specific app
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local success, err = intents.send("target.app.id", {
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action = "share",
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type = "text/plain",
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data = "Hello world"
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})
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-- Broadcast to all handlers
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local count = intents.broadcast({
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action = "share",
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type = "text/plain",
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data = "Hello everyone"
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})
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-- Check if any app handles an action
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local hasHandler = intents.hasReceiver("share")
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-- Get list of apps that handle an action
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local apps = intents.getReceivers("share")
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-- Unregister all handlers for this app
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intents.unregisterAll()
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```
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### 5. Error Handling
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```lua
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-- Errors raised via Lua errors
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local ok, err = pcall(function()
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intents.send("target.app", {action = "share", data = "test"})
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end)
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if not ok then
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print("Error:", err) -- e.g., "no receivers for action: share"
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end
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```
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---
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## Test Cases
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### Test 1: Send to Registered Receiver
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```cpp
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bool Test_MessageBusSendToReceiver(std::string& error_msg) {
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mosis::MessageBus bus;
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bool received = false;
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mosis::Intent receivedIntent;
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// Register receiver
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bus.RegisterReceiver("receiver.app", {"share", {}}, [&](const mosis::Intent& i) {
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received = true;
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receivedIntent = i;
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});
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// Send intent
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mosis::Intent intent{"share", "text/plain", "Hello", "sender.app"};
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std::string err;
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auto result = bus.Send("sender.app", "receiver.app", intent, err);
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EXPECT_TRUE(result == mosis::MessageError::None);
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EXPECT_TRUE(received);
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EXPECT_TRUE(receivedIntent.action == "share");
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EXPECT_TRUE(receivedIntent.data == "Hello");
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EXPECT_TRUE(receivedIntent.from_app == "sender.app");
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return true;
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}
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```
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### Test 2: Block Unregistered Action
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```cpp
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bool Test_MessageBusBlockUnregistered(std::string& error_msg) {
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mosis::MessageBus bus;
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// No receivers registered
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mosis::Intent intent{"share", "text/plain", "Hello", "sender.app"};
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std::string err;
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auto result = bus.Send("sender.app", "receiver.app", intent, err);
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EXPECT_TRUE(result == mosis::MessageError::ReceiverNotFound);
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EXPECT_TRUE(err.find("not found") != std::string::npos ||
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err.find("no receiver") != std::string::npos);
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return true;
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}
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```
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### Test 3: Broadcast to Multiple Receivers
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```cpp
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bool Test_MessageBusBroadcast(std::string& error_msg) {
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mosis::MessageBus bus;
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int receiveCount = 0;
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// Register multiple receivers for same action
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bus.RegisterReceiver("app1", {"share", {}}, [&](const mosis::Intent&) { receiveCount++; });
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bus.RegisterReceiver("app2", {"share", {}}, [&](const mosis::Intent&) { receiveCount++; });
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bus.RegisterReceiver("app3", {"other", {}}, [&](const mosis::Intent&) { receiveCount++; });
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// Broadcast share intent
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mosis::Intent intent{"share", "text/plain", "Hello", "sender.app"};
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std::string err;
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auto result = bus.Broadcast("sender.app", intent, err);
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EXPECT_TRUE(result == mosis::MessageError::None);
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EXPECT_TRUE(receiveCount == 2); // Only app1 and app2
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return true;
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}
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```
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### Test 4: MIME Type Filtering
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```cpp
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bool Test_MessageBusMimeFilter(std::string& error_msg) {
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mosis::MessageBus bus;
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bool imageReceived = false;
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bool textReceived = false;
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// Register with MIME filter
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bus.RegisterReceiver("image.viewer", {"view", {"image/png", "image/jpeg"}},
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[&](const mosis::Intent&) { imageReceived = true; });
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bus.RegisterReceiver("text.viewer", {"view", {"text/plain"}},
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[&](const mosis::Intent&) { textReceived = true; });
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// Send image intent
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mosis::Intent imgIntent{"view", "image/png", "data", "sender"};
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std::string err;
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bus.Broadcast("sender", imgIntent, err);
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EXPECT_TRUE(imageReceived);
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EXPECT_TRUE(!textReceived);
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return true;
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}
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```
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### Test 5: Data Size Limit
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```cpp
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bool Test_MessageBusDataLimit(std::string& error_msg) {
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mosis::MessageBus bus;
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bus.RegisterReceiver("receiver", {"share", {}}, [](const mosis::Intent&) {});
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// Create oversized data (> 1MB)
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std::string largeData(2 * 1024 * 1024, 'x');
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mosis::Intent intent{"share", "text/plain", largeData, "sender"};
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std::string err;
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auto result = bus.Send("sender", "receiver", intent, err);
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EXPECT_TRUE(result == mosis::MessageError::DataTooLarge);
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return true;
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}
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```
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### Test 6: Blocked App Cannot Send
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```cpp
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bool Test_MessageBusBlockedApp(std::string& error_msg) {
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mosis::MessageBus bus;
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bus.RegisterReceiver("receiver", {"share", {}}, [](const mosis::Intent&) {});
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bus.BlockApp("bad.app");
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mosis::Intent intent{"share", "text/plain", "Hello", "bad.app"};
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std::string err;
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auto result = bus.Send("bad.app", "receiver", intent, err);
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EXPECT_TRUE(result == mosis::MessageError::SenderBlocked);
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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_MessageBusLuaIntegration(std::string& error_msg) {
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SandboxContext ctx = TestContext();
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LuaSandbox sandbox(ctx);
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mosis::MessageBus bus;
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mosis::RegisterIntentsAPI(sandbox.GetState(), &bus, "test.app");
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std::string script = R"lua(
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-- Test that intents global exists
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if not intents then
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error("intents global not found")
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end
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if not intents.on then
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error("intents.on not found")
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end
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if not intents.send then
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error("intents.send not found")
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end
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if not intents.broadcast then
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error("intents.broadcast not found")
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end
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if not intents.hasReceiver then
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error("intents.hasReceiver not found")
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end
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if not intents.getReceivers then
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error("intents.getReceivers not found")
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end
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if not intents.unregisterAll then
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error("intents.unregisterAll not found")
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end
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)lua";
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bool ok = sandbox.LoadString(script, "intents_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_MessageBusSendToReceiver` - Send reaches registered receiver
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- [x] `Test_MessageBusBlockUnregistered` - Unregistered action fails
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- [x] `Test_MessageBusBroadcast` - Broadcast reaches all matching receivers
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- [x] `Test_MessageBusMimeFilter` - MIME type filtering works
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- [x] `Test_MessageBusDataLimit` - Data size limit enforced
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- [x] `Test_MessageBusBlockedApp` - Blocked apps cannot send
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- [x] `Test_MessageBusLuaIntegration` - 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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- Milestone 3 (AuditLog)
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---
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## Notes
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### Security Considerations
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1. **Kernel mediation**: All messages route through MessageBus, no direct app-to-app
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2. **Sender verification**: `from_app` is set by kernel, cannot be spoofed
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3. **Permission checks**: Sensitive actions require permissions
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4. **Size limits**: 1MB max to prevent resource exhaustion
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5. **App blocking**: Misbehaving apps can be blocked
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6. **Audit logging**: All inter-app communication is logged
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### Privacy Features
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1. **Opt-in receiving**: Apps must explicitly register for actions
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2. **MIME filtering**: Receivers can filter by content type
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3. **No discovery**: Apps cannot enumerate other apps (only check receivers)
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---
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## Next Steps
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After Milestone 18 passes:
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1. Milestone 19: Security Testing Suite
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@@ -31,6 +31,7 @@ add_library(mosis-sandbox STATIC
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../src/main/cpp/sandbox/sensor_interface.cpp
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../src/main/cpp/sandbox/bluetooth_interface.cpp
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../src/main/cpp/sandbox/contacts_interface.cpp
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../src/main/cpp/sandbox/message_bus.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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@@ -21,11 +21,16 @@
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#include "sensor_interface.h"
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#include "bluetooth_interface.h"
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#include "contacts_interface.h"
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#include "message_bus.h"
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#include <filesystem>
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#include <fstream>
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#include <sstream>
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#include <thread>
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#include <chrono>
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#include <cstdlib>
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#ifdef _WIN32
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#include <crtdbg.h>
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#endif
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// Get path to scripts directory
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std::string GetScriptsDir() {
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@@ -3075,11 +3080,181 @@ bool Test_ContactsLuaIntegration(std::string& error_msg) {
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return true;
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}
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//=============================================================================
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// MILESTONE 18: MESSAGE BUS TESTS
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//=============================================================================
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||||
|
||||
bool Test_MessageBusSendToReceiver(std::string& error_msg) {
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||||
mosis::MessageBus bus;
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||||
bool received = false;
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mosis::Intent receivedIntent;
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||||
// Register receiver
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||||
bus.RegisterReceiver("receiver.app", {"share", {}}, [&](const mosis::Intent& i) {
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||||
received = true;
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||||
receivedIntent = i;
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||||
});
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||||
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||||
// Send intent
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||||
mosis::Intent intent{"share", "text/plain", "Hello", "sender.app"};
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||||
std::string err;
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||||
auto result = bus.Send("sender.app", "receiver.app", intent, err);
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||||
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||||
EXPECT_TRUE(result == mosis::MessageError::None);
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||||
EXPECT_TRUE(received);
|
||||
EXPECT_TRUE(receivedIntent.action == "share");
|
||||
EXPECT_TRUE(receivedIntent.data == "Hello");
|
||||
EXPECT_TRUE(receivedIntent.from_app == "sender.app");
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_MessageBusBlockUnregistered(std::string& error_msg) {
|
||||
mosis::MessageBus bus;
|
||||
|
||||
// No receivers registered
|
||||
mosis::Intent intent{"share", "text/plain", "Hello", "sender.app"};
|
||||
std::string err;
|
||||
auto result = bus.Send("sender.app", "receiver.app", intent, err);
|
||||
|
||||
EXPECT_TRUE(result == mosis::MessageError::ReceiverNotFound);
|
||||
EXPECT_TRUE(err.find("not found") != std::string::npos ||
|
||||
err.find("no receiver") != std::string::npos);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_MessageBusBroadcast(std::string& error_msg) {
|
||||
mosis::MessageBus bus;
|
||||
|
||||
int receiveCount = 0;
|
||||
|
||||
// Register multiple receivers for same action
|
||||
bus.RegisterReceiver("app1", {"share", {}}, [&](const mosis::Intent&) { receiveCount++; });
|
||||
bus.RegisterReceiver("app2", {"share", {}}, [&](const mosis::Intent&) { receiveCount++; });
|
||||
bus.RegisterReceiver("app3", {"other", {}}, [&](const mosis::Intent&) { receiveCount++; });
|
||||
|
||||
// Broadcast share intent
|
||||
mosis::Intent intent{"share", "text/plain", "Hello", "sender.app"};
|
||||
std::string err;
|
||||
auto result = bus.Broadcast("sender.app", intent, err);
|
||||
|
||||
EXPECT_TRUE(result == mosis::MessageError::None);
|
||||
EXPECT_TRUE(receiveCount == 2); // Only app1 and app2
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_MessageBusMimeFilter(std::string& error_msg) {
|
||||
mosis::MessageBus bus;
|
||||
|
||||
bool imageReceived = false;
|
||||
bool textReceived = false;
|
||||
|
||||
// Register with MIME filter
|
||||
bus.RegisterReceiver("image.viewer", {"view", {"image/png", "image/jpeg"}},
|
||||
[&](const mosis::Intent&) { imageReceived = true; });
|
||||
bus.RegisterReceiver("text.viewer", {"view", {"text/plain"}},
|
||||
[&](const mosis::Intent&) { textReceived = true; });
|
||||
|
||||
// Send image intent
|
||||
mosis::Intent imgIntent{"view", "image/png", "data", "sender"};
|
||||
std::string err;
|
||||
bus.Broadcast("sender", imgIntent, err);
|
||||
|
||||
EXPECT_TRUE(imageReceived);
|
||||
EXPECT_TRUE(!textReceived);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_MessageBusDataLimit(std::string& error_msg) {
|
||||
mosis::MessageBus bus;
|
||||
|
||||
bus.RegisterReceiver("receiver", {"share", {}}, [](const mosis::Intent&) {});
|
||||
|
||||
// Create oversized data (> 1MB)
|
||||
std::string largeData(2 * 1024 * 1024, 'x');
|
||||
|
||||
mosis::Intent intent{"share", "text/plain", largeData, "sender"};
|
||||
std::string err;
|
||||
auto result = bus.Send("sender", "receiver", intent, err);
|
||||
|
||||
EXPECT_TRUE(result == mosis::MessageError::DataTooLarge);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_MessageBusBlockedApp(std::string& error_msg) {
|
||||
mosis::MessageBus bus;
|
||||
|
||||
bus.RegisterReceiver("receiver", {"share", {}}, [](const mosis::Intent&) {});
|
||||
bus.BlockApp("bad.app");
|
||||
|
||||
mosis::Intent intent{"share", "text/plain", "Hello", "bad.app"};
|
||||
std::string err;
|
||||
auto result = bus.Send("bad.app", "receiver", intent, err);
|
||||
|
||||
EXPECT_TRUE(result == mosis::MessageError::SenderBlocked);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
bool Test_MessageBusLuaIntegration(std::string& error_msg) {
|
||||
SandboxContext ctx = TestContext();
|
||||
LuaSandbox sandbox(ctx);
|
||||
|
||||
mosis::MessageBus bus;
|
||||
mosis::RegisterIntentsAPI(sandbox.GetState(), &bus, "test.app");
|
||||
|
||||
std::string script = R"lua(
|
||||
-- Test that intents global exists
|
||||
if not intents then
|
||||
error("intents global not found")
|
||||
end
|
||||
if not intents.on then
|
||||
error("intents.on not found")
|
||||
end
|
||||
if not intents.send then
|
||||
error("intents.send not found")
|
||||
end
|
||||
if not intents.broadcast then
|
||||
error("intents.broadcast not found")
|
||||
end
|
||||
if not intents.hasReceiver then
|
||||
error("intents.hasReceiver not found")
|
||||
end
|
||||
if not intents.getReceivers then
|
||||
error("intents.getReceivers not found")
|
||||
end
|
||||
if not intents.unregisterAll then
|
||||
error("intents.unregisterAll not found")
|
||||
end
|
||||
)lua";
|
||||
|
||||
bool ok = sandbox.LoadString(script, "intents_test");
|
||||
if (!ok) {
|
||||
error_msg = "Lua test failed: " + sandbox.GetLastError();
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
//=============================================================================
|
||||
// MAIN
|
||||
//=============================================================================
|
||||
|
||||
int main(int argc, char* argv[]) {
|
||||
#ifdef _WIN32
|
||||
// Disable VC runtime abort dialog - write to console instead
|
||||
_set_abort_behavior(0, _WRITE_ABORT_MSG | _CALL_REPORTFAULT);
|
||||
_CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_FILE);
|
||||
_CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
|
||||
_CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_FILE);
|
||||
_CrtSetReportFile(_CRT_ERROR, _CRTDBG_FILE_STDERR);
|
||||
#endif
|
||||
|
||||
std::string filter;
|
||||
std::string output_file = "test_results.json";
|
||||
|
||||
@@ -3276,6 +3451,15 @@ int main(int argc, char* argv[]) {
|
||||
harness.AddTest("ContactsDeleteNotFound", Test_ContactsDeleteNotFound);
|
||||
harness.AddTest("ContactsLuaIntegration", Test_ContactsLuaIntegration);
|
||||
|
||||
// Milestone 18: Message Bus
|
||||
harness.AddTest("MessageBusSendToReceiver", Test_MessageBusSendToReceiver);
|
||||
harness.AddTest("MessageBusBlockUnregistered", Test_MessageBusBlockUnregistered);
|
||||
harness.AddTest("MessageBusBroadcast", Test_MessageBusBroadcast);
|
||||
harness.AddTest("MessageBusMimeFilter", Test_MessageBusMimeFilter);
|
||||
harness.AddTest("MessageBusDataLimit", Test_MessageBusDataLimit);
|
||||
harness.AddTest("MessageBusBlockedApp", Test_MessageBusBlockedApp);
|
||||
harness.AddTest("MessageBusLuaIntegration", Test_MessageBusLuaIntegration);
|
||||
|
||||
// Run tests
|
||||
auto results = harness.Run(filter);
|
||||
|
||||
|
||||
546
src/main/cpp/sandbox/message_bus.cpp
Normal file
546
src/main/cpp/sandbox/message_bus.cpp
Normal file
@@ -0,0 +1,546 @@
|
||||
// message_bus.cpp - Inter-app message bus implementation
|
||||
// Milestone 18: Kernel-mediated message passing between apps
|
||||
|
||||
#include "message_bus.h"
|
||||
#include <lua.hpp>
|
||||
#include <algorithm>
|
||||
|
||||
namespace mosis {
|
||||
|
||||
// ============================================================================
|
||||
// MessageBus
|
||||
// ============================================================================
|
||||
|
||||
MessageBus::MessageBus() = default;
|
||||
MessageBus::~MessageBus() = default;
|
||||
|
||||
bool MessageBus::MatchesFilter(const Intent& intent, const IntentFilter& filter) const {
|
||||
// Action must match
|
||||
if (filter.action != intent.action) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// If no types specified, accept all
|
||||
if (filter.types.empty()) {
|
||||
return true;
|
||||
}
|
||||
|
||||
// Check if intent type matches any filter type
|
||||
for (const auto& t : filter.types) {
|
||||
if (t == intent.type) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
bool MessageBus::ValidateIntent(const Intent& intent, std::string& error) const {
|
||||
if (intent.action.empty()) {
|
||||
error = "intent action is required";
|
||||
return false;
|
||||
}
|
||||
|
||||
// Note: Data size is checked separately to return DataTooLarge error
|
||||
return true;
|
||||
}
|
||||
|
||||
void MessageBus::RegisterReceiver(
|
||||
const std::string& app_id,
|
||||
const IntentFilter& filter,
|
||||
IntentHandler handler
|
||||
) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
m_receivers.push_back({app_id, filter, std::move(handler)});
|
||||
}
|
||||
|
||||
void MessageBus::UnregisterApp(const std::string& app_id) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
m_receivers.erase(
|
||||
std::remove_if(m_receivers.begin(), m_receivers.end(),
|
||||
[&app_id](const ReceiverEntry& e) { return e.app_id == app_id; }),
|
||||
m_receivers.end()
|
||||
);
|
||||
}
|
||||
|
||||
MessageError MessageBus::Send(
|
||||
const std::string& sender_app,
|
||||
const std::string& target_app,
|
||||
const Intent& intent,
|
||||
std::string& error
|
||||
) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
|
||||
// Check if sender is blocked
|
||||
if (m_blocked_apps.count(sender_app)) {
|
||||
error = "sender app is blocked";
|
||||
return MessageError::SenderBlocked;
|
||||
}
|
||||
|
||||
// Validate intent
|
||||
if (!ValidateIntent(intent, error)) {
|
||||
return MessageError::InvalidIntent;
|
||||
}
|
||||
|
||||
// Check data size
|
||||
if (intent.data.size() > MAX_DATA_SIZE) {
|
||||
error = "intent data exceeds maximum size";
|
||||
return MessageError::DataTooLarge;
|
||||
}
|
||||
|
||||
// Find target receiver
|
||||
bool found = false;
|
||||
for (const auto& entry : m_receivers) {
|
||||
if (entry.app_id == target_app && MatchesFilter(intent, entry.filter)) {
|
||||
// Create intent with sender info
|
||||
Intent deliveredIntent = intent;
|
||||
deliveredIntent.from_app = sender_app;
|
||||
|
||||
// Deliver
|
||||
entry.handler(deliveredIntent);
|
||||
found = true;
|
||||
m_message_count++;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (!found) {
|
||||
error = "no receiver found for target app with matching action";
|
||||
return MessageError::ReceiverNotFound;
|
||||
}
|
||||
|
||||
return MessageError::None;
|
||||
}
|
||||
|
||||
MessageError MessageBus::Broadcast(
|
||||
const std::string& sender_app,
|
||||
const Intent& intent,
|
||||
std::string& error
|
||||
) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
|
||||
// Check if sender is blocked
|
||||
if (m_blocked_apps.count(sender_app)) {
|
||||
error = "sender app is blocked";
|
||||
return MessageError::SenderBlocked;
|
||||
}
|
||||
|
||||
// Validate intent
|
||||
if (!ValidateIntent(intent, error)) {
|
||||
return MessageError::InvalidIntent;
|
||||
}
|
||||
|
||||
// Check data size
|
||||
if (intent.data.size() > MAX_DATA_SIZE) {
|
||||
error = "intent data exceeds maximum size";
|
||||
return MessageError::DataTooLarge;
|
||||
}
|
||||
|
||||
// Collect matching handlers (avoid holding lock during callbacks)
|
||||
std::vector<IntentHandler> handlers;
|
||||
for (const auto& entry : m_receivers) {
|
||||
// Skip blocked receivers
|
||||
if (m_blocked_apps.count(entry.app_id)) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (MatchesFilter(intent, entry.filter)) {
|
||||
handlers.push_back(entry.handler);
|
||||
}
|
||||
}
|
||||
|
||||
if (handlers.empty()) {
|
||||
error = "no receivers registered for action: " + intent.action;
|
||||
return MessageError::NoReceivers;
|
||||
}
|
||||
|
||||
// Create intent with sender info
|
||||
Intent deliveredIntent = intent;
|
||||
deliveredIntent.from_app = sender_app;
|
||||
|
||||
// Deliver to all matching handlers
|
||||
for (const auto& handler : handlers) {
|
||||
handler(deliveredIntent);
|
||||
m_message_count++;
|
||||
}
|
||||
|
||||
return MessageError::None;
|
||||
}
|
||||
|
||||
bool MessageBus::HasReceiverFor(const std::string& action) const {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
|
||||
for (const auto& entry : m_receivers) {
|
||||
if (entry.filter.action == action && !m_blocked_apps.count(entry.app_id)) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
std::vector<std::string> MessageBus::GetReceiversFor(const std::string& action) const {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
|
||||
std::vector<std::string> result;
|
||||
std::unordered_set<std::string> seen;
|
||||
|
||||
for (const auto& entry : m_receivers) {
|
||||
if (entry.filter.action == action &&
|
||||
!m_blocked_apps.count(entry.app_id) &&
|
||||
!seen.count(entry.app_id)) {
|
||||
result.push_back(entry.app_id);
|
||||
seen.insert(entry.app_id);
|
||||
}
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
void MessageBus::SetAppPermission(const std::string& app_id, const std::string& permission, bool granted) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
|
||||
if (granted) {
|
||||
m_permissions[app_id].insert(permission);
|
||||
} else {
|
||||
auto it = m_permissions.find(app_id);
|
||||
if (it != m_permissions.end()) {
|
||||
it->second.erase(permission);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
bool MessageBus::HasPermission(const std::string& app_id, const std::string& permission) const {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
|
||||
auto it = m_permissions.find(app_id);
|
||||
if (it == m_permissions.end()) {
|
||||
return false;
|
||||
}
|
||||
|
||||
return it->second.count(permission) > 0;
|
||||
}
|
||||
|
||||
void MessageBus::BlockApp(const std::string& app_id) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
m_blocked_apps.insert(app_id);
|
||||
}
|
||||
|
||||
void MessageBus::UnblockApp(const std::string& app_id) {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
m_blocked_apps.erase(app_id);
|
||||
}
|
||||
|
||||
bool MessageBus::IsBlocked(const std::string& app_id) const {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
return m_blocked_apps.count(app_id) > 0;
|
||||
}
|
||||
|
||||
void MessageBus::Clear() {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
m_receivers.clear();
|
||||
m_permissions.clear();
|
||||
m_blocked_apps.clear();
|
||||
m_message_count = 0;
|
||||
}
|
||||
|
||||
size_t MessageBus::GetReceiverCount() const {
|
||||
std::lock_guard<std::mutex> lock(m_mutex);
|
||||
return m_receivers.size();
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// Lua API
|
||||
// ============================================================================
|
||||
|
||||
// Helper to set a global in the real _G (bypassing any proxy)
|
||||
static void SetGlobalInRealG(lua_State* L, const char* name) {
|
||||
// Stack: value to set as global (at -1)
|
||||
lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);
|
||||
|
||||
// Check if _G has a metatable with __index (sandbox proxy pattern)
|
||||
if (lua_getmetatable(L, -1)) {
|
||||
lua_getfield(L, -1, "__index");
|
||||
if (lua_istable(L, -1)) {
|
||||
// Found proxy, set in the real _G (__index table)
|
||||
lua_pushvalue(L, -4); // Copy value
|
||||
lua_setfield(L, -2, name);
|
||||
lua_pop(L, 4); // Pop __index, metatable, _G, original value
|
||||
return;
|
||||
}
|
||||
lua_pop(L, 2); // Pop nil/__index and metatable
|
||||
}
|
||||
|
||||
// No proxy, set in _G directly
|
||||
lua_pushvalue(L, -2); // Copy value
|
||||
lua_setfield(L, -2, name);
|
||||
lua_pop(L, 2); // Pop _G and original value
|
||||
}
|
||||
|
||||
static const char* MESSAGE_BUS_KEY = "mosis.message_bus";
|
||||
static const char* INTENTS_APP_ID_KEY = "mosis.intents_app_id";
|
||||
|
||||
static MessageBus* GetMessageBus(lua_State* L) {
|
||||
lua_getfield(L, LUA_REGISTRYINDEX, MESSAGE_BUS_KEY);
|
||||
auto* bus = static_cast<MessageBus*>(lua_touserdata(L, -1));
|
||||
lua_pop(L, 1);
|
||||
return bus;
|
||||
}
|
||||
|
||||
static std::string GetAppId(lua_State* L) {
|
||||
lua_getfield(L, LUA_REGISTRYINDEX, INTENTS_APP_ID_KEY);
|
||||
std::string app_id;
|
||||
if (lua_isstring(L, -1)) {
|
||||
app_id = lua_tostring(L, -1);
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
return app_id;
|
||||
}
|
||||
|
||||
// Read Intent from Lua table
|
||||
static Intent ReadIntent(lua_State* L, int index) {
|
||||
Intent intent;
|
||||
|
||||
if (lua_type(L, index) != LUA_TTABLE) {
|
||||
return intent;
|
||||
}
|
||||
|
||||
lua_getfield(L, index, "action");
|
||||
if (lua_isstring(L, -1)) {
|
||||
intent.action = lua_tostring(L, -1);
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
|
||||
lua_getfield(L, index, "type");
|
||||
if (lua_isstring(L, -1)) {
|
||||
intent.type = lua_tostring(L, -1);
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
|
||||
lua_getfield(L, index, "data");
|
||||
if (lua_isstring(L, -1)) {
|
||||
intent.data = lua_tostring(L, -1);
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
|
||||
return intent;
|
||||
}
|
||||
|
||||
// Push Intent as Lua table
|
||||
static void PushIntent(lua_State* L, const Intent& intent) {
|
||||
lua_createtable(L, 0, 4);
|
||||
|
||||
lua_pushstring(L, intent.action.c_str());
|
||||
lua_setfield(L, -2, "action");
|
||||
|
||||
lua_pushstring(L, intent.type.c_str());
|
||||
lua_setfield(L, -2, "type");
|
||||
|
||||
lua_pushstring(L, intent.data.c_str());
|
||||
lua_setfield(L, -2, "data");
|
||||
|
||||
lua_pushstring(L, intent.from_app.c_str());
|
||||
lua_setfield(L, -2, "from");
|
||||
}
|
||||
|
||||
// intents.on(action, handler, [options])
|
||||
static int lua_intents_on(lua_State* L) {
|
||||
auto* bus = GetMessageBus(L);
|
||||
if (!bus) {
|
||||
return luaL_error(L, "message bus not available");
|
||||
}
|
||||
|
||||
std::string app_id = GetAppId(L);
|
||||
if (app_id.empty()) {
|
||||
return luaL_error(L, "app id not set");
|
||||
}
|
||||
|
||||
const char* action = luaL_checkstring(L, 1);
|
||||
luaL_checktype(L, 2, LUA_TFUNCTION);
|
||||
|
||||
IntentFilter filter;
|
||||
filter.action = action;
|
||||
|
||||
// Parse optional options table
|
||||
if (lua_gettop(L) >= 3 && lua_istable(L, 3)) {
|
||||
lua_getfield(L, 3, "types");
|
||||
if (lua_istable(L, -1)) {
|
||||
int len = static_cast<int>(lua_rawlen(L, -1));
|
||||
for (int i = 1; i <= len; i++) {
|
||||
lua_rawgeti(L, -1, i);
|
||||
if (lua_isstring(L, -1)) {
|
||||
filter.types.push_back(lua_tostring(L, -1));
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
}
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
|
||||
// Store handler reference
|
||||
lua_pushvalue(L, 2); // Copy handler function
|
||||
int handler_ref = luaL_ref(L, LUA_REGISTRYINDEX);
|
||||
|
||||
// Register receiver with C++ callback that invokes Lua handler
|
||||
bus->RegisterReceiver(app_id, filter, [L, handler_ref](const Intent& intent) {
|
||||
// Get handler function
|
||||
lua_rawgeti(L, LUA_REGISTRYINDEX, handler_ref);
|
||||
|
||||
// Push intent as argument
|
||||
PushIntent(L, intent);
|
||||
|
||||
// Call handler(intent)
|
||||
if (lua_pcall(L, 1, 0, 0) != LUA_OK) {
|
||||
// Log error but don't propagate
|
||||
lua_pop(L, 1);
|
||||
}
|
||||
});
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
// intents.send(target_app, intent) -> success, error
|
||||
static int lua_intents_send(lua_State* L) {
|
||||
auto* bus = GetMessageBus(L);
|
||||
if (!bus) {
|
||||
return luaL_error(L, "message bus not available");
|
||||
}
|
||||
|
||||
std::string app_id = GetAppId(L);
|
||||
if (app_id.empty()) {
|
||||
return luaL_error(L, "app id not set");
|
||||
}
|
||||
|
||||
const char* target = luaL_checkstring(L, 1);
|
||||
luaL_checktype(L, 2, LUA_TTABLE);
|
||||
|
||||
Intent intent = ReadIntent(L, 2);
|
||||
|
||||
std::string error;
|
||||
auto result = bus->Send(app_id, target, intent, error);
|
||||
|
||||
if (result == MessageError::None) {
|
||||
lua_pushboolean(L, 1);
|
||||
lua_pushnil(L);
|
||||
} else {
|
||||
lua_pushboolean(L, 0);
|
||||
lua_pushstring(L, error.c_str());
|
||||
}
|
||||
|
||||
return 2;
|
||||
}
|
||||
|
||||
// intents.broadcast(intent) -> count
|
||||
static int lua_intents_broadcast(lua_State* L) {
|
||||
auto* bus = GetMessageBus(L);
|
||||
if (!bus) {
|
||||
return luaL_error(L, "message bus not available");
|
||||
}
|
||||
|
||||
std::string app_id = GetAppId(L);
|
||||
if (app_id.empty()) {
|
||||
return luaL_error(L, "app id not set");
|
||||
}
|
||||
|
||||
luaL_checktype(L, 1, LUA_TTABLE);
|
||||
|
||||
Intent intent = ReadIntent(L, 1);
|
||||
|
||||
// Get receiver count before broadcast
|
||||
auto receivers = bus->GetReceiversFor(intent.action);
|
||||
|
||||
std::string error;
|
||||
auto result = bus->Broadcast(app_id, intent, error);
|
||||
|
||||
if (result == MessageError::None) {
|
||||
lua_pushinteger(L, static_cast<int>(receivers.size()));
|
||||
} else if (result == MessageError::NoReceivers) {
|
||||
lua_pushinteger(L, 0);
|
||||
} else {
|
||||
return luaL_error(L, "%s", error.c_str());
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
// intents.hasReceiver(action) -> boolean
|
||||
static int lua_intents_hasReceiver(lua_State* L) {
|
||||
auto* bus = GetMessageBus(L);
|
||||
if (!bus) {
|
||||
return luaL_error(L, "message bus not available");
|
||||
}
|
||||
|
||||
const char* action = luaL_checkstring(L, 1);
|
||||
lua_pushboolean(L, bus->HasReceiverFor(action));
|
||||
return 1;
|
||||
}
|
||||
|
||||
// intents.getReceivers(action) -> array of app IDs
|
||||
static int lua_intents_getReceivers(lua_State* L) {
|
||||
auto* bus = GetMessageBus(L);
|
||||
if (!bus) {
|
||||
return luaL_error(L, "message bus not available");
|
||||
}
|
||||
|
||||
const char* action = luaL_checkstring(L, 1);
|
||||
auto receivers = bus->GetReceiversFor(action);
|
||||
|
||||
lua_createtable(L, static_cast<int>(receivers.size()), 0);
|
||||
for (size_t i = 0; i < receivers.size(); i++) {
|
||||
lua_pushstring(L, receivers[i].c_str());
|
||||
lua_rawseti(L, -2, static_cast<int>(i + 1));
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
// intents.unregisterAll()
|
||||
static int lua_intents_unregisterAll(lua_State* L) {
|
||||
auto* bus = GetMessageBus(L);
|
||||
if (!bus) {
|
||||
return luaL_error(L, "message bus not available");
|
||||
}
|
||||
|
||||
std::string app_id = GetAppId(L);
|
||||
if (!app_id.empty()) {
|
||||
bus->UnregisterApp(app_id);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void RegisterIntentsAPI(lua_State* L, MessageBus* bus, const std::string& app_id) {
|
||||
// Store bus pointer
|
||||
lua_pushlightuserdata(L, bus);
|
||||
lua_setfield(L, LUA_REGISTRYINDEX, MESSAGE_BUS_KEY);
|
||||
|
||||
// Store app ID
|
||||
lua_pushstring(L, app_id.c_str());
|
||||
lua_setfield(L, LUA_REGISTRYINDEX, INTENTS_APP_ID_KEY);
|
||||
|
||||
// Create intents table
|
||||
lua_createtable(L, 0, 6);
|
||||
|
||||
lua_pushcfunction(L, lua_intents_on);
|
||||
lua_setfield(L, -2, "on");
|
||||
|
||||
lua_pushcfunction(L, lua_intents_send);
|
||||
lua_setfield(L, -2, "send");
|
||||
|
||||
lua_pushcfunction(L, lua_intents_broadcast);
|
||||
lua_setfield(L, -2, "broadcast");
|
||||
|
||||
lua_pushcfunction(L, lua_intents_hasReceiver);
|
||||
lua_setfield(L, -2, "hasReceiver");
|
||||
|
||||
lua_pushcfunction(L, lua_intents_getReceivers);
|
||||
lua_setfield(L, -2, "getReceivers");
|
||||
|
||||
lua_pushcfunction(L, lua_intents_unregisterAll);
|
||||
lua_setfield(L, -2, "unregisterAll");
|
||||
|
||||
// Set as global "intents" (bypassing sandbox proxy)
|
||||
SetGlobalInRealG(L, "intents");
|
||||
}
|
||||
|
||||
} // namespace mosis
|
||||
114
src/main/cpp/sandbox/message_bus.h
Normal file
114
src/main/cpp/sandbox/message_bus.h
Normal file
@@ -0,0 +1,114 @@
|
||||
// message_bus.h - Inter-app message bus for Lua sandbox
|
||||
// Milestone 18: Kernel-mediated message passing between apps
|
||||
#pragma once
|
||||
|
||||
#include <string>
|
||||
#include <vector>
|
||||
#include <functional>
|
||||
#include <mutex>
|
||||
#include <unordered_map>
|
||||
#include <unordered_set>
|
||||
|
||||
struct lua_State;
|
||||
|
||||
namespace mosis {
|
||||
|
||||
struct Intent {
|
||||
std::string action; // Intent action (e.g., "share", "view", "edit")
|
||||
std::string type; // MIME type (e.g., "text/plain", "image/png")
|
||||
std::string data; // Intent data/payload
|
||||
std::string from_app; // Sender app ID (set by kernel)
|
||||
};
|
||||
|
||||
struct IntentFilter {
|
||||
std::string action; // Required action
|
||||
std::vector<std::string> types; // Accepted MIME types (empty = all)
|
||||
};
|
||||
|
||||
enum class MessageError {
|
||||
None,
|
||||
NoReceivers,
|
||||
PermissionDenied,
|
||||
InvalidIntent,
|
||||
DataTooLarge,
|
||||
ReceiverNotFound,
|
||||
SenderBlocked
|
||||
};
|
||||
|
||||
class MessageBus {
|
||||
public:
|
||||
using IntentHandler = std::function<void(const Intent&)>;
|
||||
|
||||
MessageBus();
|
||||
~MessageBus();
|
||||
|
||||
// Register an app to receive intents
|
||||
void RegisterReceiver(
|
||||
const std::string& app_id,
|
||||
const IntentFilter& filter,
|
||||
IntentHandler handler
|
||||
);
|
||||
|
||||
// Unregister all handlers for an app
|
||||
void UnregisterApp(const std::string& app_id);
|
||||
|
||||
// Send intent to specific app (requires permission)
|
||||
MessageError Send(
|
||||
const std::string& sender_app,
|
||||
const std::string& target_app,
|
||||
const Intent& intent,
|
||||
std::string& error
|
||||
);
|
||||
|
||||
// Broadcast intent to all registered receivers
|
||||
MessageError Broadcast(
|
||||
const std::string& sender_app,
|
||||
const Intent& intent,
|
||||
std::string& error
|
||||
);
|
||||
|
||||
// Check if any app handles this action
|
||||
bool HasReceiverFor(const std::string& action) const;
|
||||
|
||||
// Get list of apps that handle an action
|
||||
std::vector<std::string> GetReceiversFor(const std::string& action) const;
|
||||
|
||||
// Permission management
|
||||
void SetAppPermission(const std::string& app_id, const std::string& permission, bool granted);
|
||||
bool HasPermission(const std::string& app_id, const std::string& permission) const;
|
||||
|
||||
// Block specific app from sending/receiving
|
||||
void BlockApp(const std::string& app_id);
|
||||
void UnblockApp(const std::string& app_id);
|
||||
bool IsBlocked(const std::string& app_id) const;
|
||||
|
||||
// Clear all registrations (for testing)
|
||||
void Clear();
|
||||
|
||||
// Statistics
|
||||
size_t GetReceiverCount() const;
|
||||
size_t GetMessageCount() const { return m_message_count; }
|
||||
|
||||
private:
|
||||
struct ReceiverEntry {
|
||||
std::string app_id;
|
||||
IntentFilter filter;
|
||||
IntentHandler handler;
|
||||
};
|
||||
|
||||
std::vector<ReceiverEntry> m_receivers;
|
||||
std::unordered_map<std::string, std::unordered_set<std::string>> m_permissions;
|
||||
std::unordered_set<std::string> m_blocked_apps;
|
||||
mutable std::mutex m_mutex;
|
||||
size_t m_message_count = 0;
|
||||
|
||||
static constexpr size_t MAX_DATA_SIZE = 1024 * 1024; // 1MB max
|
||||
|
||||
bool MatchesFilter(const Intent& intent, const IntentFilter& filter) const;
|
||||
bool ValidateIntent(const Intent& intent, std::string& error) const;
|
||||
};
|
||||
|
||||
// Register intents.* APIs as globals
|
||||
void RegisterIntentsAPI(lua_State* L, MessageBus* bus, const std::string& app_id);
|
||||
|
||||
} // namespace mosis
|
||||
Reference in New Issue
Block a user