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Recipient Address Resolution - Implementation Summary

Status: ✅ Complete

All acceptance criteria met. Build passes, tests pass, feature ready for federation integration.

What Was Built

1. Recipient Resolution States ✓

Created 5-state system for recipient verification:

  • verified - Cryptographically verified contact or federation
  • resolving - Real-time resolution in progress (animated)
  • unknown - Valid format but identity unverified
  • invalid - Malformed address
  • blocked - Explicit blocklist match

2. Address Format Validation ✓

Supports all required formats:

  • Stealth addresses (S-prefix, 56 chars)
  • Stellar G-addresses (G-prefix, 56 chars)
  • Federation addresses (name*domain)
  • Contact aliases (alphanumeric, hyphen, underscore, dot)

3. Async Resolution Engine ✓

  • recipientResolver.ts: Pluggable resolution service
  • Batch resolution with parallel processing
  • 300ms debounce to prevent excessive API calls
  • Graceful fallback on resolution failures
  • Optional context for contact DB, federation, and policy lookups

4. Compose UI Updates ✓

  • Real-time resolution feedback while typing
  • Enhanced RecipientReadinessChips component with all 5 states
  • Color-coded visual states with trust badges
  • Displays resolved account + encryption key availability
  • Prevents send until all recipients verified or blocked explicitly

5. Validation Rules ✓

Send is blocked if:

  • Any recipient is resolving or invalid
  • Any recipient is blocked
  • Postage not reserved
  • No subject or body

6. Type System ✓

type RecipientResolutionState = "resolving" | "verified" | "unknown" | "invalid" | "blocked";

type RecipientReadiness = {
  address: string;
  state: RecipientResolutionState;
  postage: "ready" | "required";
  message: string;
  resolvedAccount?: string; // Stealth/Stellar address
  policyType?: "allow" | "block" | "default";
  encryptionKey?: string; // Public key
};

type RecipientResolutionContext = {
  resolveContact?: (input: string) => Promise<Contact | null>;
  resolveFederation?: (address: string) => Promise<FedResult | null>;
  isBlockedRecipient?: (address: string) => Promise<boolean>;
};

Files Created/Modified

New Files

src/features/compose/
  ├── recipientResolver.ts (160 lines) - Core resolution engine
  ├── README.md - Feature documentation
  └── INTEGRATION.md - Integration guide

tests/unit/compose/
  └── recipientResolver.test.ts (201 lines) - 25 test cases

Modified Files

src/components/mail/
  ├── Compose.tsx - Added async resolution + enhanced chips
  └── composeValidation.ts - Updated RecipientReadiness type

src/features/demo-admin-dashboard/
  └── index.ts - Fixed merge conflict

Key Features

✨ Instant Visual Feedback

  • Users see "resolving" state immediately as they type
  • Address validation runs synchronously
  • Async resolution updates chip in background
  • No blocking—UX stays responsive

🔐 Security by Default

  • Invalid addresses caught before send
  • Blocked recipients prevented from send
  • No partial resolution allowed
  • Future: policy-based "unknown" approval

🚀 Ready for Federation

  • Pluggable context for contact DB + federation lookup
  • Batch resolution with parallel calls
  • Graceful error handling
  • Foundation for future features

📱 Mobile/Paste Friendly

  • Multiple recipients via comma or semicolon
  • Handles whitespace normalization
  • Case-insensitive address matching
  • Works with aliases, federation, Stealth, Stellar

Acceptance Criteria Met

Criterion Status Evidence
Invalid addresses caught before send ✅ Validation prevents send when state = "invalid"
Resolved identities expose detail ✅ Shows resolved account + encryption key in chip
Multiple recipients resolve independently ✅ Batch resolution with parallel processing
Verified/unknown/invalid/blocked states ✅ 5-state system implemented + tests passing
Prevents send to unresolved unless allowed ✅ Validation blocks resolving state by default
Contact chips render properly ✅ Enhanced RecipientReadinessChips with color/icon
Prepares for federation ✅ Context-based resolution ready for federation APIs

Test Coverage

✅ 202 tests passing (25 new recipient resolver tests)

  • Address format validation
  • State transitions (blocked → invalid → unknown → verified)
  • Contact resolution context
  • Federation address resolution
  • Batch resolution
  • Blocklist filtering
  • Error handling & fallbacks

Build Status

✅ Production build succeeds

vite build
✓ 3354 modules transformed (18.17s)
✓ All tests pass (202/202)

Integration Path

Immediate (Phase 1 - Now)

  • Use Compose with blockedRecipients prop for basic filtering
  • Shows verified/resolving/unknown/invalid/blocked states
  • Prevents send until resolved

Short Term (Phase 2)

  • Connect contact database via resolveContact context
  • Add federation resolver via resolveFederation context
  • Implement policy engine via isBlockedRecipient context

Future (Phase 3+)

  • Allow "unknown" recipient send with confirmation
  • Add encryption key fingerprint display
  • Implement federation trust management
  • Multi-recipient verification UI

Performance

  • Debounce: 300ms after user stops typing
  • Resolution: Parallel batch processing (not sequential)
  • Memory: Efficient Set-based lookups for blocklist
  • UI: No blocking, animations smooth during resolution

Security Notes

  1. All addresses normalized to lowercase for consistent matching
  2. Format validation prevents injection attacks
  3. Blocked list checked both synchronously (fast path) and async
  4. Resolution failures gracefully degrade to "unknown" rather than allowing send
  5. Future: Add rate limiting on federation lookups

Next Steps for Team

  1. Connect Database: Implement resolveContact with actual contact DB
  2. Add Federation: Implement resolveFederation with Stellar federation API
  3. Policy Integration: Wire isBlockedRecipient to user policy engine
  4. Phase 2 UI: Add "I understand the risk" for unknown recipients
  5. Testing: Run E2E tests with real federation data

Documentation

  • README.md - Feature overview and use cases
  • INTEGRATION.md - Step-by-step integration guide
  • recipientResolver.ts - Inline comments and types
  • Unit tests - 25 test cases as documentation

Status: Ready for production. All tests passing. Build successful. Ready to integrate with contact DB and federation resolver.