stack/apps/api

Mosaic Stack API

The Mosaic Stack API is a NestJS-based backend service providing REST endpoints and WebSocket support for the Mosaic productivity platform.

Overview

The API serves as the central backend for:

• Task Management - Create, update, track tasks with filtering and sorting
• Event Management - Calendar events and scheduling
• Project Management - Organize work into projects
• Knowledge Base - Wiki-style documentation with markdown support and wiki-linking
• Ideas - Quick capture and organization of ideas
• Domains - Categorize work across different domains
• Personalities - AI personality configurations for the Ollama integration
• Widgets & Layouts - Dashboard customization
• Activity Logging - Track all user actions
• WebSocket Events - Real-time updates for tasks, events, and projects

Available Modules

Module	Base Path	Description
Tasks	/api/tasks	CRUD operations for tasks with filtering
Events	/api/events	Calendar events and scheduling
Projects	/api/projects	Project management
Knowledge	/api/knowledge/entries	Wiki entries with markdown support
Knowledge Tags	/api/knowledge/tags	Tag management for knowledge entries
Ideas	/api/ideas	Quick capture and idea management
Domains	/api/domains	Domain categorization
Personalities	/api/personalities	AI personality configurations
Widgets	/api/widgets	Dashboard widget data
Layouts	/api/layouts	Dashboard layout configuration
Ollama	/api/ollama	LLM integration (generate, chat, embed)
Users	/api/users/me/preferences	User preferences

Health Check

• GET / - API health check
• GET /health - Detailed health status including database connectivity

Authentication

The API uses BetterAuth for authentication with the following features:

Authentication Flow

1. Email/Password - Users can sign up and log in with email and password
2. Session Tokens - BetterAuth generates session tokens with configurable expiration

Guards

The API uses a layered guard system:

Guard	Purpose	Applies To
AuthGuard	Verifies user authentication via Bearer token	Most protected endpoints
WorkspaceGuard	Validates workspace membership and sets Row-Level Security (RLS) context	Workspace-scoped resources
PermissionGuard	Enforces role-based access control	Admin operations

Workspace Roles

• OWNER - Full control over workspace
• ADMIN - Administrative functions (can delete content, manage members)
• MEMBER - Standard access (create/edit content)
• GUEST - Read-only access

Permission Levels

Used with @RequirePermission() decorator:

Permission.WORKSPACE_OWNER   // Requires OWNER role
Permission.WORKSPACE_ADMIN   // Requires ADMIN or OWNER
Permission.WORKSPACE_MEMBER  // Requires MEMBER, ADMIN, or OWNER
Permission.WORKSPACE_ANY     // Any authenticated member including GUEST

Providing Workspace Context

Workspace ID can be provided via:

1. Header: X-Workspace-Id: <workspace-id> (highest priority)
2. URL Parameter: :workspaceId
3. Request Body: workspaceId field

Example: Protected Controller

@Controller('tasks')
@UseGuards(AuthGuard, WorkspaceGuard, PermissionGuard)
export class TasksController {
  @Post()
  @RequirePermission(Permission.WORKSPACE_MEMBER)
  async create(@Body() dto: CreateTaskDto, @Workspace() workspaceId: string) {
    // workspaceId is verified and RLS context is set
  }
}

Environment Variables

Variable	Description	Default
PORT	API server port	3001
DATABASE_URL	PostgreSQL connection string	Required
NODE_ENV	Environment (development, production)	-
NEXT_PUBLIC_APP_URL	Frontend application URL (for CORS)	http://localhost:3000
WEB_URL	WebSocket CORS origin	http://localhost:3000

Running Locally

Prerequisites

• Node.js 18+
• PostgreSQL database
• pnpm workspace (part of Mosaic Stack monorepo)

Setup

1. Install dependencies:

   pnpm install
   

2. Set up environment variables:

   cp .env.example .env  # If available
   # Edit .env with your DATABASE_URL
   

3. Generate Prisma client:

   pnpm prisma:generate
   

4. Run database migrations:

   pnpm prisma:migrate
   

5. Seed the database (optional):

   pnpm prisma:seed
   

Development

pnpm dev

The API will start on http://localhost:3001

Production Build

pnpm build
pnpm start:prod

Database Management

# Open Prisma Studio
pnpm prisma:studio

# Reset database (dev only)
pnpm prisma:reset

# Run migrations in production
pnpm prisma:migrate:prod

API Documentation

The API does not currently include Swagger/OpenAPI documentation. Instead:

• Controller files contain detailed JSDoc comments describing each endpoint
• DTO classes define request/response schemas with class-validator decorators
• Refer to the controller source files in src/ for endpoint details

Example: Reading an Endpoint

// src/tasks/tasks.controller.ts

/**
 * POST /api/tasks
 * Create a new task
 * Requires: MEMBER role or higher
 */
@Post()
@RequirePermission(Permission.WORKSPACE_MEMBER)
async create(@Body() createTaskDto: CreateTaskDto, @Workspace() workspaceId: string) {
  return this.tasksService.create(workspaceId, user.id, createTaskDto);
}

WebSocket Support

The API provides real-time updates via WebSocket. Clients receive notifications for:

• task:created - New task created
• task:updated - Task modified
• task:deleted - Task removed
• event:created - New event created
• event:updated - Event modified
• event:deleted - Event removed
• project:updated - Project modified

Clients join workspace-specific rooms for scoped updates.

Testing

# Run unit tests
pnpm test

# Run tests with coverage
pnpm test:coverage

# Run e2e tests
pnpm test:e2e

# Watch mode
pnpm test:watch

Project Structure

src/
├── activity/          # Activity logging
├── auth/              # Authentication (BetterAuth config, guards)
├── common/            # Shared decorators and guards
├── database/          # Database module
├── domains/           # Domain management
├── events/            # Event management
├── filters/           # Global exception filters
├── ideas/             # Idea capture and management
├── knowledge/         # Knowledge base (entries, tags, markdown)
├── layouts/           # Dashboard layouts
├── lib/               # Utility functions
├── ollama/            # LLM integration
├── personalities/     # AI personality configurations
├── prisma/            # Prisma service
├── projects/          # Project management
├── tasks/             # Task management
├── users/             # User preferences
├── widgets/           # Dashboard widgets
├── websocket/         # WebSocket gateway
├── app.controller.ts  # Root controller (health check)
├── app.module.ts      # Root module
└── main.ts            # Application bootstrap