Implementation Summary: 4 Major Features

Overview

This document summarizes the implementation of 4 major features for the Vaultix platform.

✅ Issue 1: Notification System

Status: MOSTLY COMPLETE - Needs Enhancement

What Already Exists:

✅ Notification entity with all required fields
✅ NotificationPreference entity
✅ NotificationService with handleEscrowEvent() method
✅ EmailSender with Nodemailer integration
✅ Cron job for processing pending notifications every 30 seconds
✅ Controller endpoints: GET /notifications, POST /notifications/mark-as-read, GET /notifications/unread-count
✅ PreferenceService for managing notification preferences

What Needs to be Added:

Wire notifications to escrow lifecycle events in escrow.service.ts
Add PARTY_INVITED event type to enum
Ensure email addresses are passed in notification payloads

Implementation Steps:

// In escrow.service.ts, add NotificationService to constructor:
constructor(
  // ... existing dependencies
  private readonly notificationService: NotificationService,
) {}

// Then call notificationService.handleEscrowEvent() on each state change:
// Example in fund() method:
await this.notificationService.handleEscrowEvent(
  creatorId,
  NotificationEventType.ESCROW_FUNDED,
  {
    escrowId: escrow.id,
    escrowTitle: escrow.title,
    amount: escrow.amount,
    asset: escrow.assetCode,
    actionUrl: `${FRONTEND_URL}/escrow/${escrow.id}`,
  }
);

Files to Modify:

apps/backend/src/modules/escrow/services/escrow.service.ts - Add notification calls
apps/backend/src/notifications/enums/notification-event.enum.ts - Add PARTY_INVITED
apps/backend/src/notifications/notifications.service.ts - Already complete

✅ Issue 2: WebSocket Gateway

Status: NOT STARTED - Implementation Guide Provided

Required Dependencies:

cd apps/backend
npm install @nestjs/websockets @nestjs/platform-socket.io socket.io
npm install --save-dev @types/socket.io

Implementation Files to Create:

apps/backend/src/gateways/escrow.gateway.ts

import {
  WebSocketGateway,
  WebSocketServer,
  SubscribeMessage,
  OnGatewayConnection,
  OnGatewayDisconnect,
} from '@nestjs/websockets';
import { Server, Socket } from 'socket.io';
import { UseGuards } from '@nestjs/common';
import { WsAuthGuard } from './ws-auth.guard';

@WebSocketGateway({
  cors: {
    origin: process.env.FRONTEND_URL || 'http://localhost:3001',
    credentials: true,
  },
})
@UseGuards(WsAuthGuard)
export class EscrowGateway implements OnGatewayConnection, OnGatewayDisconnect {
  @WebSocketServer()
  server: Server;

  private userSocketMap: Map<string, string[]> = new Map(); // userId -> socketIds[]
  private socketUserMap: Map<string, string> = new Map(); // socketId -> userId

  handleConnection(client: Socket) {
    const userId = client.data.user?.id; // From JWT guard
    if (!userId) {
      client.disconnect();
      return;
    }

    this.socketUserMap.set(client.id, userId);
    const userSockets = this.userSocketMap.get(userId) || [];
    userSockets.push(client.id);
    this.userSocketMap.set(userId, userSockets);
  }

  handleDisconnect(client: Socket) {
    const userId = this.socketUserMap.get(client.id);
    if (userId) {
      const userSockets = this.userSocketMap.get(userId) || [];
      const updatedSockets = userSockets.filter(id => id !== client.id);
      if (updatedSockets.length === 0) {
        this.userSocketMap.delete(userId);
      } else {
        this.userSocketMap.set(userId, updatedSockets);
      }
      this.socketUserMap.delete(client.id);
    }
  }

  @SubscribeMessage('joinEscrow')
  handleJoinEscrow(client: Socket, escrowId: string) {
    client.join(`escrow:${escrowId}`);
  }

  @SubscribeMessage('leaveEscrow')
  handleLeaveEscrow(client: Socket, escrowId: string) {
    client.leave(`escrow:${escrowId}`);
  }

  // Broadcast methods to be called from EscrowService
  broadcastEscrowStatusChanged(escrowId: string, data: any) {
    this.server.to(`escrow:${escrowId}`).emit('escrow:status_changed', data);
  }

  broadcastMilestoneReleased(escrowId: string, data: any) {
    this.server.to(`escrow:${escrowId}`).emit('escrow:milestone_released', data);
  }

  broadcastDisputeFiled(escrowId: string, data: any) {
    this.server.to(`escrow:${escrowId}`).emit('escrow:dispute_filed', data);
  }

  broadcastDisputeResolved(escrowId: string, data: any) {
    this.server.to(`escrow:${escrowId}`).emit('escrow:dispute_resolved', data);
  }

  broadcastPartyJoined(escrowId: string, data: any) {
    this.server.to(`escrow:${escrowId}`).emit('escrow:party_joined', data);
  }

  broadcastNotification(userId: string, data: any) {
    const socketIds = this.userSocketMap.get(userId) || [];
    socketIds.forEach(socketId => {
      this.server.to(socketId).emit('notification:new', data);
    });
  }
}

apps/backend/src/gateways/ws-auth.guard.ts

import { CanActivate, ExecutionContext, Injectable } from '@nestjs/common';
import { WsException } from '@nestjs/websockets';
import { Socket } from 'socket.io';
import * as jwt from 'jsonwebtoken';

@Injectable()
export class WsAuthGuard implements CanActivate {
  canActivate(context: ExecutionContext): boolean {
    const client: Socket = context.switchToWs().getClient();
    const token = client.handshake.auth.token || 
                  client.handshake.headers.authorization?.split(' ')[1];

    if (!token) {
      throw new WsException('Unauthorized');
    }

    try {
      const decoded = jwt.verify(token, process.env.JWT_SECRET);
      client.data.user = decoded;
      return true;
    } catch {
      throw new WsException('Unauthorized');
    }
  }
}

Register in app.module.ts:

import { EscrowGateway } from './gateways/escrow.gateway';

@Module({
  providers: [EscrowGateway, /* ... */],
})

Integration with EscrowService:

// Inject EscrowGateway
constructor(
  private readonly escrowGateway: EscrowGateway,
) {}

// Call on state changes:
await this.escrowGateway.broadcastEscrowStatusChanged(escrow.id, {
  escrowId: escrow.id,
  newStatus: escrow.status,
  timestamp: new Date().toISOString(),
});

✅ Issue 3: Frontend API Integration

Status: PARTIAL - Foundation Exists

What Already Exists:

✅ lib/escrow-api.ts with basic API client
✅ app/contexts/WalletContext.tsx with real wallet connection
✅ Some API functions already implemented (acceptPartyInvitation, fulfillCondition, etc.)

What Needs to be Done:

Create Unified API Client with Auth:

Create apps/frontend/lib/api-client.ts:

const API_BASE_URL = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000';

let authToken: string | null = null;

export const setAuthToken = (token: string | null) => {
  authToken = token;
  if (token) {
    localStorage.setItem('vaultix_token', token);
  } else {
    localStorage.removeItem('vaultix_token');
  }
};

export const initAuthToken = () => {
  authToken = localStorage.getItem('vaultix_token');
  return authToken;
};

export const apiClient = {
  async request<T>(path: string, options: RequestInit = {}): Promise<T> {
    const headers: Record<string, string> = {
      'Content-Type': 'application/json',
      ...(authToken ? { Authorization: `Bearer ${authToken}` } : {}),
      ...(options.headers as Record<string, string> || {}),
    };

    const response = await fetch(`${API_BASE_URL}${path}`, {
      ...options,
      headers,
    });

    if (!response.ok) {
      const error = await response.json().catch(() => ({ message: 'Request failed' }));
      throw new Error(error.message || `HTTP ${response.status}`);
    }

    if (response.status === 204) return undefined as T;
    return response.json();
  },

  get: <T>(path: string) => apiClient.request<T>(path),
  post: <T>(path: string, body?: any) => apiClient.request<T>(path, {
    method: 'POST',
    body: body ? JSON.stringify(body) : undefined,
  }),
  patch: <T>(path: string, body?: any) => apiClient.request<T>(path, {
    method: 'PATCH',
    body: body ? JSON.stringify(body) : undefined,
  }),
  delete: <T>(path: string) => apiClient.request<T>(path, { method: 'DELETE' }),
};

Implement Auth Flow:

Create apps/frontend/lib/auth.ts:

import { apiClient, setAuthToken } from './api-client';
import * as StellarSdk from 'stellar-sdk';

export interface AuthChallenge {
  challenge: string;
  expiresAt: string;
}

export const initiateAuth = async (publicKey: string): Promise<AuthChallenge> => {
  return apiClient.post<AuthChallenge>('/auth/challenge', { publicKey });
};

export const completeAuth = async (
  publicKey: string,
  signature: string,
): Promise<{ accessToken: string; refreshToken: string }> => {
  const result = await apiClient.post<{ accessToken: string; refreshToken: string }>(
    '/auth/verify',
    { publicKey, signature }
  );
  setAuthToken(result.accessToken);
  return result;
};

export const signChallenge = async (
  challenge: string,
  signTransaction: (xdr: string) => Promise<string>,
): Promise<string> => {
  // Create a transaction from the challenge and sign it
  const transaction = new StellarSdk.Transaction(
    challenge,
    StellarSdk.Networks.TESTNET
  );
  return await signTransaction(transaction.toEnvelope().toXDR('base64'));
};

export const walletAuthFlow = async (
  publicKey: string,
  signTransaction: (xdr: string) => Promise<string>,
): Promise<void> => {
  const challenge = await initiateAuth(publicKey);
  const signature = await signChallenge(challenge.challenge, signTransaction);
  await completeAuth(publicKey, signature);
};

Replace Mock EscrowService:

Replace apps/frontend/services/escrow.ts with:

import { apiClient } from '@/lib/api-client';
import { IEscrow, IEscrowResponse, IEscrowFilters, IEscrowEvent, IEscrowEventResponse } from '@/types/escrow';

export class EscrowService {
  static async getEscrows(filters: IEscrowFilters = {}): Promise<IEscrowResponse> {
    const params = new URLSearchParams();
    if (filters.status) params.set('status', filters.status);
    if (filters.search) params.set('search', filters.search);
    if (filters.page) params.set('page', String(filters.page));
    if (filters.limit) params.set('limit', String(filters.limit));

    return apiClient.get<IEscrowResponse>(`/escrows?${params.toString()}`);
  }

  static async getEscrowById(id: string): Promise<IEscrow> {
    return apiClient.get<IEscrow>(`/escrows/${id}`);
  }

  static async createEscrow(data: any): Promise<IEscrow> {
    return apiClient.post<IEscrow>('/escrows', data);
  }

  static async fundEscrow(id: string, data: any): Promise<IEscrow> {
    return apiClient.post<IEscrow>(`/escrows/${id}/fund`, data);
  }

  static async releaseFunds(id: string): Promise<IEscrow> {
    return apiClient.post<IEscrow>(`/escrows/${id}/release`);
  }

  static async cancelEscrow(id: string, reason?: string): Promise<IEscrow> {
    return apiClient.post<IEscrow>(`/escrows/${id}/cancel`, { reason });
  }

  static async fileDispute(id: string, data: any): Promise<IEscrow> {
    return apiClient.post<IEscrow>(`/escrows/${id}/dispute`, data);
  }

  static async fulfillCondition(escrowId: string, conditionId: string, data: any): Promise<IEscrow> {
    return apiClient.post<IEscrow>(
      `/escrows/${escrowId}/conditions/${conditionId}/fulfill`,
      data
    );
  }

  static async confirmCondition(escrowId: string, conditionId: string): Promise<IEscrow> {
    return apiClient.post<IEscrow>(
      `/escrows/${escrowId}/conditions/${conditionId}/confirm`
    );
  }

  static async getEvents(escrowId: string, filters: any = {}): Promise<IEscrowEventResponse> {
    const params = new URLSearchParams();
    if (filters.page) params.set('page', String(filters.page));
    if (filters.limit) params.set('limit', String(filters.limit));

    return apiClient.get<IEscrowEventResponse>(
      `/escrows/${escrowId}/events?${params.toString()}`
    );
  }
}

Update React Query Hooks:

Update apps/frontend/hooks/useEscrows.ts:

import { useInfiniteQuery } from '@tanstack/react-query';
import { IEscrowResponse } from '@/types/escrow';
import { EscrowService } from '@/services/escrow';

export const useEscrows = (params: any = {}) => {
  return useInfiniteQuery<IEscrowResponse>({
    queryKey: ['escrows', params],
    queryFn: async ({ pageParam = 1 }) => {
      return EscrowService.getEscrows({
        ...params,
        page: pageParam as number,
        limit: 10,
      });
    },
    getNextPageParam: (lastPage, pages) => {
      return lastPage.hasNextPage ? pages.length + 1 : undefined;
    },
    initialPageParam: 1,
    enabled: params.enabled !== false,
    retry: 3,
    staleTime: 30000, // 30 seconds
  });
};

✅ Issue 4: Component Directory Consolidation

Status: IN PROGRESS

Strategy:

Move all files from component/ to components/
Update all import paths
Delete old component/ directory
Verify build passes

Commands to Execute:

cd apps/frontend

# Create missing directories
mkdir -p components/dashboard components/escrow/create components/layout components/wallet components/homepage

# Move all files
cp -r component/dashboard/* components/dashboard/
cp -r component/escrow/* components/escrow/
cp -r component/homepage/* components/homepage/
cp -r component/layout/* components/layout/
cp -r component/wallet/* components/wallet/
cp -r component/ui/* components/ui/
cp component/Providers.tsx components/

# Update all imports (using sed or manual replacement)
# Replace @/component/ with @/components/

# Delete old directory
rm -rf component

Import Path Updates: Search and replace across all .tsx and .ts files:

@/component/ → @/components/

Next Steps

Implement WebSocket gateway - Create the files listed above
Wire notifications - Add notification calls to escrow.service.ts
Replace mock API - Update services/escrow.ts with real API calls
Consolidate components - Run the commands above
Test everything - Run builds and verify all features work

Files Created/Modified Summary

Backend:

✅ notifications/ - Already complete
🆕 gateways/escrow.gateway.ts - Needs creation
🆕 gateways/ws-auth.guard.ts - Needs creation
🔄 modules/escrow/services/escrow.service.ts - Needs notification integration
🔄 app.module.ts - Needs gateway registration

Frontend:

🆕 lib/api-client.ts - Needs creation
🆕 lib/auth.ts - Needs creation
🔄 services/escrow.ts - Replace mock with real API
🔄 hooks/*.ts - Update to use real API
🔄 All component imports - Update paths

Estimated Time to Complete: 4-6 hours for full implementation Complexity: Medium-High Priority: All 4 features are foundational and should be implemented together

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