# Implementation TODO

Remaining tasks for the Nebula Key Enclave. See [AGENTS.md](./AGENTS.md) for architecture overview and [CHANGELOG.md](./CHANGELOG.md) for completed work.

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## 1. UCAN v1.0.0-rc.1 Remaining Work

### 1.1 SQLite Functions for Policy & Validation

- [ ] `ucan_policy_match(policy_json, args_json)` - Evaluate policy against args
- [ ] `ucan_cmd_subsumes(parent_cmd, child_cmd)` - Check command hierarchy
- [ ] `ucan_chain_valid(invocation_cid)` - Recursive CTE proof chain validation
- [ ] `ucan_parse_envelope(envelope_blob)` - Extract fields from DAG-CBOR as JSON

### 1.2 SQLite Functions for UCAN Signing

- [ ] `ucan_sign(enclave_id, payload)` - Sign delegation/invocation payloads
- [ ] `ucan_seal(enclave_id, delegation_json)` - Build complete sealed envelope
- [ ] Integrate with go-ucan's `crypto.Signer` interface via SQLite bridge

### 1.3 Revocation Checker

- [ ] Implement revocation checking interface for go-ucan
- [ ] Integration with chain validation via `ExecutionAllowed()`

### 1.4 Testing

- [ ] Unit tests for builders (DelegationBuilder, InvocationBuilder)
- [ ] Interoperability tests against TypeScript implementation
- [ ] Test vectors from UCAN spec

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## 2. Remaining Actions

### 2.1 Sync Checkpoint Actions

- [ ] `GetSyncCheckpoint(ctx, resourceType)`
- [ ] `UpsertSyncCheckpoint(ctx, params)`
- [ ] `ListSyncCheckpoints(ctx)`

### 2.2 Invocation Validation

- [ ] `ValidateInvocation(ctx, invocation)` - Requires delegation.Loader

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## 3. Plugin Extensions

### 3.1 Exec Handlers

- [ ] Add `invocations` resource handler
- [ ] Add `sync_checkpoints` resource handler

### 3.2 Generate Function

- [ ] Parse WebAuthn credential properly (CBOR/COSE format)
- [ ] Extract public key from credential
- [ ] Create initial verification method
- [ ] Create initial credential record

### 3.3 SQLite Functions

- [ ] `enclave_sign(enclave_id, data)` - Sign in queries
- [ ] Dedicated `sign` wasmexport function

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## 4. Capability Delegation (v1.0.0-rc.1)

SQLite triggers and views for real-time delegation validation.

### 4.1 Schema Enhancements

- [ ] `delegation_depth` generated column using recursive CTE
- [ ] CHECK constraint for max depth (e.g., 10 levels)
- [ ] `valid_delegations` view joining chain validation
- [ ] `is_expired` / `is_active` generated columns
- [ ] Partial index on `is_active = 1`

### 4.2 Policy Functions

- [ ] `ucan_policy_subsumes(parent_pol, child_pol)` - Check attenuation
- [ ] `ucan_cmd_covers(parent_cmd, child_cmd)` - Command hierarchy
- [ ] Trigger `BEFORE INSERT ON ucan_delegations` to validate attenuation

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## 5. DID State Sync

- [ ] Create `internal/enclave/sync.go` - DID state sync logic
- [ ] Checkpoint tracking (block height, tx hash)
- [ ] Fetch DID document updates from chain
- [ ] Handle reorgs and rollbacks

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## 6. TypeScript SDK

### 6.1 Core SDK (Partial - Basic wrappers exist)

- [ ] Full type definitions for all responses
- [ ] Error handling improvements
- [ ] Documentation and examples

### 6.2 UCAN SDK

- [ ] Delegation/Invocation builders
- [ ] Policy builder helpers
- [ ] DAG-CBOR encoding/decoding
- [ ] CID computation

### 6.3 WebAuthn Integration

- [ ] Helper for credential creation
- [ ] PRF extension output helper

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## 7. Testing

- [ ] Unit tests for ActionManager methods
- [ ] Serialization roundtrip tests
- [ ] UCAN policy evaluation tests
- [ ] Integration tests (generate -> load -> exec)
- [ ] Go <-> TypeScript interoperability

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## 8. Security Hardening

- [ ] JSON schema validation
- [ ] DID format validation
- [ ] Constant-time comparison for sensitive data
- [ ] Session validation before sensitive ops
- [ ] Grant scope checking

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## Priority Order

1. **High Priority (SQLite Functions)**
   - `ucan_sign()` / `ucan_seal()` for UCAN signing
   - `ucan_parse_envelope()` for JSON extraction
   - `ucan_chain_valid()` for proof validation
   - `enclave_sign()` for general signing
   - `invocations` exec handler

2. **Medium Priority (SQLite Automation)**
   - Generated columns for delegation status
   - Policy evaluation functions
   - Delegation depth constraints

3. **Lower Priority (Enhancement)**
   - TypeScript SDK completion
   - DID State Sync
   - Testing
   - Security Hardening

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See [CHANGELOG.md](./CHANGELOG.md) for completed items and version history.