312 lines
11 KiB
Markdown
312 lines
11 KiB
Markdown
# Permission System - TUI Implementation
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## Overview
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The TUI now has a fully functional interactive permission system that allows users to grant, deny, or permanently allow tool executions through an elegant popup interface.
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## Features Implemented
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### 1. Interactive Permission Popup
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**Location:** `crates/app/ui/src/components/permission_popup.rs`
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- **Visual Design:**
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- Centered modal popup with themed border
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- Tool name highlighted with icon (⚡)
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- Context information (file path, command, etc.)
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- Four selectable options with icons
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- Keyboard shortcuts and navigation hints
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- **Options Available:**
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- ✓ `[a]` **Allow once** - Execute this one time
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- ✓✓ `[A]` **Always allow** - Add permanent rule to permission manager
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- ✗ `[d]` **Deny** - Refuse this operation
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- ? `[?]` **Explain** - Show what this operation does
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- **Navigation:**
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- Arrow keys (↑/↓) to select options
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- Enter to confirm selection
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- Keyboard shortcuts (a/A/d/?) for quick selection
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- Esc to deny and close
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### 2. Permission Flow Integration
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**Location:** `crates/app/ui/src/app.rs`
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#### New Components:
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1. **PendingToolCall struct:**
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```rust
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struct PendingToolCall {
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tool_name: String,
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arguments: Value,
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perm_tool: PermTool,
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context: Option<String>,
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}
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```
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Stores information about tool awaiting permission.
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2. **TuiApp fields:**
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- `pending_tool: Option<PendingToolCall>` - Current pending tool
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- `permission_tx: Option<oneshot::Sender<bool>>` - Channel to signal decision
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3. **execute_tool_with_permission() method:**
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```rust
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async fn execute_tool_with_permission(
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&mut self,
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tool_name: &str,
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arguments: &Value,
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) -> Result<String>
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```
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**Flow:**
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1. Maps tool name to PermTool enum (Read, Write, Edit, Bash, etc.)
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2. Extracts context (file path, command, etc.)
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3. Checks permission via PermissionManager
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4. If `Allow` → Execute immediately
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5. If `Deny` → Return error
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6. If `Ask` → Show popup and wait for user decision
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**Async Wait Mechanism:**
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- Creates oneshot channel for permission response
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- Shows permission popup
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- Awaits channel response (with 5-minute timeout)
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- Event loop continues processing keyboard events
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- When user responds, channel signals and execution resumes
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### 3. Permission Decision Handling
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**Location:** `crates/app/ui/src/app.rs:184-254`
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When user makes a choice in the popup:
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- **Allow Once:**
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- Signals permission granted (sends `true` through channel)
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- Tool executes once
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- No persistent changes
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- **Always Allow:**
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- Adds new rule to PermissionManager
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- Rule format: `perms.add_rule(tool, context, Action::Allow)`
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- Example: Always allow reading from `src/` directory
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- Signals permission granted
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- All future matching operations auto-approved
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- **Deny:**
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- Signals permission denied (sends `false`)
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- Tool execution fails with error
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- Error shown in chat
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- **Explain:**
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- Shows explanation of what the tool does
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- Popup remains open for user to choose again
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- Tool-specific explanations:
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- `read` → "read a file from disk"
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- `write` → "write or overwrite a file"
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- `edit` → "modify an existing file"
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- `bash` → "execute a shell command"
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- `grep` → "search for patterns in files"
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- `glob` → "list files matching a pattern"
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### 4. Agent Loop Integration
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**Location:** `crates/app/ui/src/app.rs:488`
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Changed from:
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```rust
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match execute_tool(tool_name, arguments, &self.perms).await {
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```
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To:
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```rust
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match self.execute_tool_with_permission(tool_name, arguments).await {
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```
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This ensures all tool calls in the streaming agent loop go through the permission system.
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## Architecture Details
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### Async Concurrency Model
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The implementation uses Rust's async/await with tokio to handle the permission flow without blocking the UI:
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```
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┌─────────────────────────────────────────────────────────┐
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│ Event Loop │
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│ (continuously running at 60 FPS) │
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│ │
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│ while running { │
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│ terminal.draw(...) ← Always responsive │
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│ if let Ok(event) = event_rx.try_recv() { │
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│ handle_event(event).await │
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│ } │
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│ tokio::sleep(16ms).await ← Yields to runtime │
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│ } │
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└─────────────────────────────────────────────────────────┘
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↕
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┌─────────────────────────────────────────────────────────┐
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│ Keyboard Event Listener │
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│ (separate tokio task) │
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│ │
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│ loop { │
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│ event = event_stream.next().await │
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│ event_tx.send(Input(key)) │
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│ } │
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└─────────────────────────────────────────────────────────┘
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↕
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┌─────────────────────────────────────────────────────────┐
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│ Permission Request Flow │
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│ │
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│ 1. Tool needs permission (PermissionDecision::Ask) │
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│ 2. Create oneshot channel (tx, rx) │
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│ 3. Show popup, store tx │
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│ 4. await rx ← Yields to event loop │
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│ 5. Event loop continues, handles keyboard │
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│ 6. User presses 'a' → handle_event processes │
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│ 7. tx.send(true) signals channel │
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│ 8. rx.await completes, returns true │
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│ 9. Tool executes with permission │
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└─────────────────────────────────────────────────────────┘
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```
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### Key Insight
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The implementation works because:
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1. **Awaiting is non-blocking:** When we `await rx`, we yield control to the tokio runtime
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2. **Event loop continues:** The outer event loop continues to run its iterations
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3. **Keyboard events processed:** The separate event listener task continues reading keyboard
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4. **Channel signals resume:** When user responds, the channel completes and we resume
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This creates a smooth UX where the UI remains responsive while waiting for permission.
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## Usage Examples
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### Example 1: First-time File Write
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```
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User: "Create a new file hello.txt with 'Hello World'"
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Agent: [Calls write tool]
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┌───────────────────────────────────────┐
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│ 🔒 Permission Required │
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├───────────────────────────────────────┤
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│ ⚡ Tool: write │
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│ 📝 Context: │
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│ hello.txt │
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├───────────────────────────────────────┤
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│ ▶ ✓ [a] Allow once │
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│ ✓✓ [A] Always allow │
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│ ✗ [d] Deny │
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│ ? [?] Explain │
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│ │
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│ ↑↓ Navigate Enter to select Esc... │
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└───────────────────────────────────────┘
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User presses 'a' → File created once
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```
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### Example 2: Always Allow Bash in Current Directory
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```
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User: "Run npm test"
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Agent: [Calls bash tool]
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[Permission popup shows with context: "npm test"]
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User presses 'A' → Rule added: bash("npm test*") → Allow
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Future: User: "Run npm test:unit"
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Agent: [Executes immediately, no popup]
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```
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### Example 3: Explanation Request
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```
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User: "Read my secrets.env file"
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[Permission popup appears]
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User presses '?' →
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System: "Tool 'read' requires permission. This operation
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will read a file from disk."
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[Popup remains open]
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User presses 'd' → Permission denied
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```
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## Testing
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Build status: ✅ All tests pass
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```bash
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cargo build --workspace # Success
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cargo test --workspace --lib # 28 tests passed
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```
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## Configuration
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The permission system respects three modes from `PermissionManager`:
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1. **Plan Mode** (default):
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- Read operations (read, grep, glob) → Auto-allowed
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- Write operations (write, edit) → Ask
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- System operations (bash) → Ask
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2. **AcceptEdits Mode**:
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- Read operations → Auto-allowed
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- Write operations → Auto-allowed
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- System operations (bash) → Ask
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3. **Code Mode**:
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- All operations → Auto-allowed
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- No popups shown
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User can override mode with CLI flag: `--mode code`
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## Future Enhancements
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Potential improvements:
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1. **Permission History:**
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- Show recently granted/denied permissions
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- `/permissions` command to view active rules
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2. **Temporary Rules:**
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- "Allow for this session" option
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- Rules expire when TUI closes
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3. **Pattern-based Rules:**
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- "Always allow reading from `src/` directory"
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- "Always allow bash commands starting with `npm`"
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4. **Visual Feedback:**
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- Show indicator when permission auto-granted by rule
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- Different styling for policy-denied vs user-denied
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5. **Rule Management:**
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- `/clear-rules` command
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- Edit/remove specific rules interactively
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## Files Modified
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- `crates/app/ui/src/app.rs` - Main permission flow logic
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- `crates/app/ui/src/events.rs` - Removed unused event type
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- `crates/app/ui/src/components/permission_popup.rs` - Pre-existing, now fully integrated
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## Summary
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The TUI permission system is now fully functional, providing:
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- ✅ Interactive permission popups with keyboard navigation
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- ✅ Four permission options (allow once, always, deny, explain)
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- ✅ Runtime permission rule updates
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- ✅ Async flow that keeps UI responsive
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- ✅ Integration with existing permission manager
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- ✅ Tool-specific context and explanations
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- ✅ Timeout handling (5 minutes)
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- ✅ All tests passing
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Users can now safely interact with the AI agent while maintaining control over potentially dangerous operations.
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