# nu_plugin_kms Implementation Status

## Phase 1: Base Structure (COMPLETED ✅)

**Date**: 2025-10-08
**Agent**: Agente 4 (Base Structure)

### Files Created

| File | Lines | Status | Description |
|------|-------|--------|-------------|
| `Cargo.toml` | 23 | ✅ Complete | Dependencies with path references |
| `src/main.rs` | 194 | ✅ Complete | Plugin entry point with 4 commands |
| `src/helpers.rs` | 23 | 🟡 Stub | Backend implementations (for Agente 5) |
| `src/tests.rs` | 7 | 🟡 Stub | Test suite (for Agente 5) |
| `README.md` | 24 | ✅ Complete | Basic documentation |
| **Total** | **271** | - | - |

### Build Verification

```
✅ cargo check: PASSED (5 non-critical warnings)
✅ cargo build: PASSED (32.18s)
✅ Binary created: target/debug/nu_plugin_kms (23MB)
✅ Protocol handshake: SUCCESS
✅ MsgPack serialization: Working
```

### Commands Implemented (Placeholder)

#### 1. `kms encrypt`
```nushell
kms encrypt <data> --backend <backend> --key <key>
```
- **Input**: String
- **Output**: String (placeholder: "ENCRYPTED_PLACEHOLDER")
- **Backends**: rustyvault, age, cosmian
- **Status**: Stub implementation

#### 2. `kms decrypt`
```nushell
kms decrypt <encrypted> --backend <backend> --key <key>
```
- **Input**: String
- **Output**: String (placeholder: "DECRYPTED_PLACEHOLDER")
- **Backends**: rustyvault, age, cosmian
- **Status**: Stub implementation

#### 3. `kms generate-key`
```nushell
kms generate-key --spec <AES256|AES128> --backend <backend>
```
- **Input**: Nothing
- **Output**: Record {plaintext: string, ciphertext: string}
- **Key Specs**: AES128, AES256
- **Status**: Stub implementation

#### 4. `kms status`
```nushell
kms status
```
- **Input**: Nothing
- **Output**: Record {backend: string, available: bool}
- **Status**: Stub implementation

### Dependencies Configured

#### Path Dependencies (Nushell Integration)
```toml
nu-plugin = { version = "0.107.1", path = "../nushell/crates/nu-plugin" }
nu-protocol = { version = "0.107.1", path = "../nushell/crates/nu-protocol", features = ["plugin"] }
```

#### External Dependencies (KMS Backends)
```toml
rusty_vault = "0.2.1"          # RustyVault client
age = "0.10"                   # Age encryption
base64 = "0.22"                # Base64 encoding
serde = "1.0"                  # Serialization
serde_json = "1.0"             # JSON support
reqwest = "0.12"               # HTTP client (fallback)
tokio = "1.40"                 # Async runtime
tempfile = "3.10"              # Temporary files
```

### Helper Functions (Stub)

```rust
// src/helpers.rs
pub enum Backend {
    RustyVault,
    Age,
    Cosmian,
    Fallback,
}

pub fn detect_backend() -> Backend
pub fn encode_base64(data: &[u8]) -> String
pub fn decode_base64(data: &str) -> Result<Vec<u8>, String>
```

### Pattern Compliance

✅ **Follows nu_plugin_tera structure exactly**:
- Same Cargo.toml pattern (path dependencies to ../nushell/)
- Same Plugin trait implementation
- Same SimplePluginCommand pattern
- Same module organization (helpers.rs, tests.rs)
- Same category: `Custom("provisioning".into())`
- Same serializer: `MsgPackSerializer`

## Phase 2: Backend Implementation (PENDING 🟡)

**Assigned To**: Agente 5 (KMS Backend Implementation)

### Tasks for Agente 5

#### 1. RustyVault Backend
- [ ] Implement `encrypt_with_rustyvault(data, key) -> Result<String>`
- [ ] Implement `decrypt_with_rustyvault(encrypted, key) -> Result<String>`
- [ ] Implement `generate_key_rustyvault(spec) -> Result<(Vec<u8>, Vec<u8>)>`
- [ ] Add RustyVault client initialization
- [ ] Add error handling and retries
- [ ] Add connection pooling

#### 2. Age Backend
- [ ] Implement `encrypt_with_age(data, recipient) -> Result<String>`
- [ ] Implement `decrypt_with_age(encrypted, identity_path) -> Result<String>`
- [ ] Implement `generate_age_keypair() -> Result<(String, String)>`
- [ ] Add age recipient handling
- [ ] Add identity file management
- [ ] Add age armor format support

#### 3. Cosmian Backend
- [ ] Implement `encrypt_with_cosmian(data, key) -> Result<String>`
- [ ] Implement `decrypt_with_cosmian(encrypted, key) -> Result<String>`
- [ ] Add Cosmian client initialization
- [ ] Add CoverCrypt support
- [ ] Add policy-based encryption

#### 4. HTTP Fallback Backend
- [ ] Implement `encrypt_via_http(data, endpoint) -> Result<String>`
- [ ] Implement `decrypt_via_http(encrypted, endpoint) -> Result<String>`
- [ ] Add HTTP client with retry logic
- [ ] Add authentication (API keys, JWT)
- [ ] Add TLS certificate validation

#### 5. Backend Detection
- [ ] Implement `detect_backend() -> Backend`
  - Check environment variables (KMS_BACKEND)
  - Check RustyVault connectivity
  - Check Age key availability
  - Check Cosmian configuration
  - Fallback to HTTP endpoint
- [ ] Add backend health checks
- [ ] Add backend failover logic

#### 6. Command Implementation
- [ ] Update `KmsEncrypt::run()` with real encryption
- [ ] Update `KmsDecrypt::run()` with real decryption
- [ ] Update `KmsGenerateKey::run()` with real key generation
- [ ] Update `KmsStatus::run()` with real health checks
- [ ] Add proper error handling (LabeledError)
- [ ] Add input validation

#### 7. Testing
- [ ] Unit tests for each backend
- [ ] Integration tests with mock KMS services
- [ ] Error case testing
- [ ] Performance benchmarks
- [ ] Documentation tests (examples)

#### 8. Documentation
- [ ] Add command examples to README
- [ ] Add backend configuration guide
- [ ] Add troubleshooting section
- [ ] Add performance considerations
- [ ] Add security best practices

### Expected File Structure After Phase 2

```
nu_plugin_kms/
├── Cargo.toml
├── README.md
├── src/
│   ├── main.rs (commands)
│   ├── helpers.rs (→ backends/)
│   ├── backends/
│   │   ├── mod.rs
│   │   ├── rustyvault.rs
│   │   ├── age.rs
│   │   ├── cosmian.rs
│   │   ├── http.rs
│   │   └── common.rs
│   ├── tests.rs
│   └── lib.rs (optional)
├── tests/
│   ├── integration_tests.rs
│   ├── backend_tests.rs
│   └── fixtures/
├── examples/
│   ├── basic_encryption.rs
│   ├── key_generation.rs
│   └── backend_selection.rs
└── benches/
    └── encryption_benchmarks.rs
```

## Integration Points

### 1. Config System Integration
Plugin should read configuration from provisioning config:
```toml
[kms]
backend = "rustyvault"  # or "age", "cosmian", "http"
rustyvault_addr = "http://localhost:8200"
age_recipients_file = "~/.config/provisioning/age/recipients.txt"
cosmian_endpoint = "https://cosmian.example.com"
http_fallback_url = "http://localhost:8080/kms"
```

### 2. Environment Variables
```bash
KMS_BACKEND=rustyvault|age|cosmian|http
VAULT_ADDR=http://localhost:8200
VAULT_TOKEN=...
AGE_RECIPIENTS_FILE=...
AGE_IDENTITY_FILE=...
COSMIAN_ENDPOINT=...
KMS_HTTP_ENDPOINT=...
```

### 3. Nushell Integration
After building, register the plugin:
```nushell
plugin add target/release/nu_plugin_kms
plugin use kms
```

Usage examples:
```nushell
# Encrypt data
"my secret" | kms encrypt --backend rustyvault

# Decrypt data
"ENCRYPTED_DATA" | kms decrypt --backend rustyvault

# Generate key
kms generate-key --spec AES256

# Check status
kms status
```

### 4. CLI Integration
The provisioning CLI can use this plugin for:
- Config file encryption (`provisioning config encrypt`)
- Secret management (`provisioning secrets encrypt`)
- Dynamic secret generation
- KMS health monitoring

## Success Criteria

### Phase 1 (Completed ✅)
- [x] Plugin structure created following nu_plugin_tera pattern
- [x] All 4 commands defined with proper signatures
- [x] Plugin compiles without errors
- [x] Plugin responds to protocol handshake
- [x] Dependencies configured with path references
- [x] README documentation complete

### Phase 2 (Pending 🟡)
- [ ] All 4 backends implemented (RustyVault, Age, Cosmian, HTTP)
- [ ] Backend auto-detection working
- [ ] All commands perform real encryption/decryption
- [ ] Comprehensive test suite (unit + integration)
- [ ] Error handling complete
- [ ] Documentation with examples
- [ ] Performance benchmarks passing
- [ ] Security audit passed

## Timeline Estimate

| Phase | Tasks | Estimated Time |
|-------|-------|---------------|
| Phase 1: Base Structure | 5 files, basic structure | ✅ Completed |
| Phase 2: Backend Implementation | 4 backends, tests, docs | ~8-12 hours |
| Phase 3: Integration Testing | End-to-end testing | ~2-4 hours |
| Phase 4: Documentation | User guide, examples | ~2-3 hours |
| **Total** | - | **12-19 hours** |

## References

### Similar Plugins
- `nu_plugin_tera` - Template rendering (structure pattern)
- Existing KMS service - HTTP API reference
- Config encryption module - Use case examples

### External Documentation
- [RustyVault API](https://github.com/Tongsuo-Project/RustyVault)
- [Age Encryption](https://github.com/FiloSottile/age)
- [Cosmian KMS](https://docs.cosmian.com/)
- [Nushell Plugin Guide](https://www.nushell.sh/contributor-book/plugins.html)

---

**Status**: Ready for Agente 5 (Backend Implementation)
**Last Updated**: 2025-10-08
**Next Agent**: Agente 5 - KMS Backend Implementation