foxhunt/WAVE_121_AGENT_2_JWT_AUTH_HELPERS.md

Wave 121 Agent 2: JWT Authentication Helper Module

Status: ✅ COMPLETE Date: 2025-10-08 Agent: Agent 2 - JWT Authentication Helper Module

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🎯 Mission Summary

Create a reusable JWT authentication helper module for E2E tests that can generate valid tokens and authenticated gRPC clients.

📦 Deliverables

1. Core Authentication Helper Module

Location: /home/jgrusewski/Work/foxhunt/services/trading_service/tests/common/auth_helpers.rs

Features Implemented:

• ✅ JWT token generation matching API Gateway validation
• ✅ Authentication interceptor for gRPC clients
• ✅ Support for trader, admin, and viewer roles
• ✅ MFA-enabled and MFA-disabled scenarios
• ✅ Builder pattern for configuration customization
• ✅ Environment-based JWT secret management
• ✅ Token validation test helpers (expired, invalid issuer)

Key Functions:

// Generate JWT tokens
pub fn create_default_test_jwt() -> Result<String>
pub fn create_test_jwt(config: TestAuthConfig) -> Result<String>
pub fn create_expired_test_jwt() -> Result<String>
pub fn create_invalid_issuer_jwt() -> Result<String>

// Create authentication interceptors
pub fn create_auth_interceptor(config: TestAuthConfig) -> Result<impl Fn(...) + Clone>

// Configuration presets
impl TestAuthConfig {
    pub fn trader() -> Self
    pub fn admin() -> Self
    pub fn viewer() -> Self
    pub fn with_mfa_enabled(self) -> Self
    pub fn with_mfa_unverified(self) -> Self
}

// Helper functions
pub fn get_test_user_id() -> String
pub fn get_test_jwt_secret() -> String
pub fn get_api_gateway_addr() -> String

2. Test Suite

Location: /home/jgrusewski/Work/foxhunt/services/trading_service/tests/auth_helpers_tests.rs

Test Coverage:

• ✅ 25 unit tests (100% pass rate)
• ✅ JWT token generation validation
• ✅ Claims structure verification
• ✅ Expiry and issuer validation
• ✅ Configuration builder pattern
• ✅ MFA scenario testing
• ✅ Token uniqueness (JTI)

Test Results:

running 25 tests
test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

3. Comprehensive Documentation

Location: /home/jgrusewski/Work/foxhunt/services/trading_service/tests/common/README.md

Documentation Includes:

• Quick start guide with examples
• Core function reference
• Configuration options and presets
• Advanced usage patterns (MFA, multiple clients)
• Environment variable configuration
• JWT token structure reference
• Integration examples with existing tests
• Testing checklist
• Troubleshooting guide
• Best practices

4. Module Structure

services/trading_service/tests/common/
├── mod.rs                 # Module exports
├── auth_helpers.rs        # Core authentication helpers (532 lines)
└── README.md             # Comprehensive documentation

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🔑 Key Implementation Details

JWT Token Generation

Matches API Gateway Requirements:

// Token structure
{
    "jti": "unique-jwt-id",           // Required for revocation
    "sub": "test_trader_001",         // User ID
    "iat": 1234567890,                // Issued at
    "exp": 1234571490,                // Expiry (1 hour)
    "iss": "foxhunt-trading",         // MUST match API Gateway
    "aud": "trading-api",             // MUST match API Gateway
    "roles": ["trader"],
    "permissions": ["api.access", "trading.submit", "trading.view"],
    "token_type": "access",
    "session_id": "session-uuid"
}

Authentication Interceptor

Injects Required Metadata:

// Authorization header
req.metadata_mut().insert("authorization", "Bearer <token>");

// User context headers
req.metadata_mut().insert("x-user-id", user_id);
req.metadata_mut().insert("x-user-role", role);

Configuration Presets

Trader (Default):

• User: test_trader_001
• Roles: ["trader"]
• Permissions: ["api.access", "trading.submit", "trading.view", "trading.cancel"]
• MFA: Disabled

Admin:

• User: test_admin_001
• Roles: ["admin"]
• Permissions: ["api.access", "trading.*", "admin.*"]
• MFA: Enabled & Verified

Viewer:

• User: test_viewer_001
• Roles: ["viewer"]
• Permissions: ["api.access", "trading.view"]
• MFA: Disabled

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📊 Usage Examples

Basic Authenticated Client

use common::auth_helpers::{create_auth_interceptor, TestAuthConfig};

#[tokio::test]
async fn test_authenticated_request() -> Result<()> {
    let interceptor = create_auth_interceptor(TestAuthConfig::trader())?;
    let channel = Channel::from_static("http://localhost:50051").connect().await?;
    let mut client = TradingServiceClient::with_interceptor(channel, interceptor);

    let response = client.get_account_info(Request::new(GetAccountInfoRequest {})).await?;
    Ok(())
}

Custom Configuration

let config = TestAuthConfig::trader()
    .with_user_id("custom_user_123")
    .with_permissions(vec!["admin.cancel_all".to_string()])
    .with_expiry(Duration::minutes(30))
    .with_mfa_enabled();

let interceptor = create_auth_interceptor(config)?;

Testing Authorization Failures

#[tokio::test]
async fn test_insufficient_permissions() -> Result<()> {
    // Viewer has read-only permissions
    let interceptor = create_auth_interceptor(TestAuthConfig::viewer())?;
    let channel = Channel::from_static("http://localhost:50051").connect().await?;
    let mut client = TradingServiceClient::with_interceptor(channel, interceptor);

    // Attempt to submit order (should fail)
    let result = client.submit_order(Request::new(order_request)).await;

    assert!(result.is_err());
    assert!(matches!(result.unwrap_err().code(), tonic::Code::PermissionDenied));
    Ok(())
}

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🔧 Environment Configuration

Environment Variables

JWT_SECRET (Optional)

export JWT_SECRET="custom-secret-for-testing"

Default: m5G2uUIX1DzSYYny8hXkF93udN5s3Tq5oFWSrGtCqyTaUeYwslf/9sh6UxF5KM5AF0PwlbRWmXHAvbCF73V+Dw==

API_GATEWAY_ADDR (Optional)

export API_GATEWAY_ADDR="http://api-gateway:50051"

Default: http://localhost:50051

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✅ Success Criteria

• Module compiles without errors
• Functions generate valid JWT tokens
• Tokens pass API Gateway authentication
• Easy to integrate into existing tests
• Comprehensive documentation provided
• Test suite validates all functionality
• Supports MFA scenarios
• Configurable via environment variables

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📈 Test Results

Compilation: ✅ Success (warnings only, no errors)

Finished `test` profile [optimized + debuginfo] target(s) in 9.16s

Test Execution: ✅ 100% Pass Rate

running 25 tests
test result: ok. 25 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

Test Coverage:

• JWT token generation: ✅ 7 tests
• Configuration builders: ✅ 4 tests
• Helper functions: ✅ 3 tests
• Token validation: ✅ 6 tests
• Claims verification: ✅ 5 tests

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🚀 Integration with Existing Tests

Before (Each test had duplicate code):

// Repeated in every test file
fn generate_test_token() -> Result<String> {
    let claims = Claims { /* ... */ };
    encode(&Header::new(Algorithm::HS256), &claims, &key)?
}

After (Centralized reusable helper):

// Simple one-liner
use common::auth_helpers::{create_auth_interceptor, TestAuthConfig};

let interceptor = create_auth_interceptor(TestAuthConfig::trader())?;

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📝 Dependencies

No new dependencies required - Uses existing crates:

• jsonwebtoken (already in Cargo.toml)
• tonic (already in Cargo.toml)
• anyhow (already in Cargo.toml)
• chrono (already in Cargo.toml)
• uuid (already in Cargo.toml)
• serde (already in Cargo.toml)

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🔗 Related Files

Implementation:

• /home/jgrusewski/Work/foxhunt/services/trading_service/tests/common/auth_helpers.rs
• /home/jgrusewski/Work/foxhunt/services/trading_service/tests/common/mod.rs

Tests:

• /home/jgrusewski/Work/foxhunt/services/trading_service/tests/auth_helpers_tests.rs

Documentation:

• /home/jgrusewski/Work/foxhunt/services/trading_service/tests/common/README.md
• This summary: /home/jgrusewski/Work/foxhunt/WAVE_121_AGENT_2_JWT_AUTH_HELPERS.md

Reference Implementation:

• /home/jgrusewski/Work/foxhunt/services/api_gateway/src/auth/jwt/service.rs (JWT validation)
• /home/jgrusewski/Work/foxhunt/services/api_gateway/src/auth/mfa/mod.rs (MFA integration)
• /home/jgrusewski/Work/foxhunt/services/integration_tests/tests/trading_service_e2e.rs (Usage example)

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🎯 Next Steps for Other Agents

Other E2E test agents can now use this module:

mod common;

use common::auth_helpers::{create_auth_interceptor, TestAuthConfig};

#[tokio::test]
async fn your_e2e_test() -> Result<()> {
    // Use the helper!
    let interceptor = create_auth_interceptor(TestAuthConfig::trader())?;
    let channel = Channel::from_static("http://localhost:50051").connect().await?;
    let mut client = YourServiceClient::with_interceptor(channel, interceptor);

    // Make authenticated requests
    // ...

    Ok(())
}

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📊 Impact Summary

Code Quality:

• Eliminates duplicate JWT token generation code across tests
• Centralizes authentication logic for consistency
• Provides type-safe configuration with builder pattern

Test Reliability:

• Ensures all tests use correct JWT structure
• Validates tokens match API Gateway requirements
• Supports testing both success and failure scenarios

Developer Experience:

• Simple, intuitive API
• Comprehensive documentation with examples
• Easy integration with existing test suites
• Environment-based configuration for CI/CD

Coverage: 532 lines of production code + 25 passing tests + comprehensive documentation

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Agent 2 Status: ✅ MISSION COMPLETE