Add comprehensive documentation for sync features
- Add SECURITY_AUDIT.md with A- security rating - Add SECURITY_ENHANCEMENTS.md for improvements - Add DEVICE_CAP_IMPLEMENTATION.md complete guide - Add KOREADER_SETUP.md device setup guide - Add SYNC_USER_GUIDE.md user documentation - Document all API endpoints and features - Include security considerations and best practices
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# Device Cap Implementation - Task 2
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**Date**: February 1, 2026
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**Status**: ✅ COMPLETE
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---
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## Overview
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Implemented admin-configurable device cap per user as specified in the session requirements. This allows administrators to control the maximum number of devices each user can register.
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---
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## Changes Made
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### 1. Database Schema
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**File**: `database/schema/schema.sql`
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Added `max_devices` column to `users` table:
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```sql
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max_devices INTEGER DEFAULT 10
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```
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- **Default Value**: 10 devices per user
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- **Constraints**: 1-100 devices (validated in handler)
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- **Purpose**: Prevent excessive device registrations per user
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### 2. Database Queries
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**File**: `internal/database/queries/queries.sql`
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Added two new queries:
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#### UpdateUserMaxDevices
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```sql
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-- name: UpdateUserMaxDevices :exec
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UPDATE users SET max_devices = $2, updated_at = NOW() WHERE id = $1;
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```
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- Updates max devices limit for a specific user
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- Parameters: user_id (UUID), max_devices (integer)
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#### CountUserDevices
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```sql
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-- name: CountUserDevices :one
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SELECT COUNT(*) FROM devices WHERE user_id = $1;
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```
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- Counts current devices for a user
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- Useful for validation and display
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### 3. Handler Implementation
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**File**: `internal/handlers/auth.go`
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Added new handler method:
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#### UpdateUserMaxDevicesRequest
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```go
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type UpdateUserMaxDevicesRequest struct {
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MaxDevices int32 `json:"max_devices" validate:"required,min=1,max=100"`
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}
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```
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#### UpdateUserMaxDevices Handler
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```go
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func (h *AuthHandler) UpdateUserMaxDevices(c echo.Context) error {
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userID := c.Param("id")
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if userID == "" {
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return c.JSON(http.StatusBadRequest, map[string]string{"error": "user id required"})
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}
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var req UpdateUserMaxDevicesRequest
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if err := c.Bind(&req); err != nil {
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return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid request"})
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}
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if err := c.Validate(&req); err != nil {
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return c.JSON(http.StatusBadRequest, map[string]string{"error": err.Error()})
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}
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userUUID, err := uuid.Parse(userID)
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if err != nil {
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return c.JSON(http.StatusBadRequest, map[string]string{"error": "invalid user id"})
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}
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err = h.db.UpdateUserMaxDevices(c.Request().Context(), database.UpdateUserMaxDevicesParams{
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ID: pgtype.UUID{Bytes: userUUID, Valid: true},
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MaxDevices: pgtype.Int4{Int32: req.MaxDevices, Valid: true},
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})
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if err != nil {
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return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
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}
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return c.JSON(http.StatusOK, map[string]string{"message": "max devices updated"})
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}
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```
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**Features**:
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- Validates user ID format (UUID)
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- Validates max_devices range (1-100)
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- Requires admin authentication
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- Updates user's max_devices in database
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- Returns success/error messages
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### 4. UserList Update
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**File**: `internal/handlers/auth.go`
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Updated `UserList` struct to include max_devices:
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```go
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type UserList struct {
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ID string `json:"id"`
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Email string `json:"email"`
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Username string `json:"username"`
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FirstName string `json:"first_name"`
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LastName string `json:"last_name"`
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Theme string `json:"theme"`
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Role string `json:"role"`
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MaxDevices int32 `json:"max_devices"`
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CreatedAt string `json:"created_at"`
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UpdatedAt string `json:"updated_at"`
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}
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```
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### 5. Route Registration
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**File**: `cmd/server/main.go`
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Added new admin route:
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```go
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admin.PUT("/users/:id/max-devices", authHandler.UpdateUserMaxDevices)
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```
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- **Path**: `/api/auth/users/:id/max-devices`
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- **Method**: PUT
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- **Auth**: Admin only (uses AdminMiddleware)
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- **Validation**: 1-100 devices
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### 6. SQLC Code Generation
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**File**: `internal/database/sqlc.yaml`
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- Regenerated database code using `sqlc generate`
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- Created `UpdateUserMaxDevices` and `UpdateUserMaxDevicesParams` types
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- Created `CountUserDevices` function
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### 7. Bruno API Collection
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Created 4 Bruno files for API testing:
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#### 1. Update User Max Devices (Documentation)
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- **Path**: `bruno/user/admin/Update User Max Devices.bru`
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- Contains complete API documentation
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- Includes all validation rules
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- Example payloads for common values
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#### 2. Update User Max Devices - Success
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- **Path**: `bruno/user/admin/Update User Max Devices - Success.bru`
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- Tests successful update to 5 devices
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- Expected: 200 OK
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#### 3. Update User Max Devices - Invalid Zero
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- **Path**: `bruno/user/admin/Update User Max Devices - Invalid Zero.bru`
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- Tests validation of zero devices (below minimum)
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- Expected: 400 Bad Request
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#### 4. Update User Max Devices - Exceeds Maximum
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- **Path**: `bruno/user/admin/Update User Max Devices - Invalid Too High.bru`
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- Tests validation of 101 devices (above maximum)
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- Expected: 400 Bad Request
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#### 5. Update User Max Devices - Missing ID
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- **Path**: `bruno/user/admin/Update User Max Devices - Missing ID.bru`
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- Tests missing user ID in URL
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- Expected: 400 Bad Request
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### 8. Go Tests
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**File**: `cmd/server/tests/device_cap_test.go`
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Created comprehensive test suite with 7 test functions:
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#### TestUpdateUserMaxDevices
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Tests successful updates:
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- Update to 5 devices
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- Update to 10 devices (default)
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- Update to 50 devices
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- Update to 100 devices (maximum)
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#### TestUpdateUserMaxDevicesValidation
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Tests validation rules:
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- Zero devices (below minimum)
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- Negative devices
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- 101 devices (above maximum)
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- 1000 devices (far above maximum)
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#### TestUpdateUserMaxDevicesAuth
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Tests authentication:
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- No authorization token
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- Non-admin user attempting to access endpoint
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- Expected: 401 Unauthorized or 403 Forbidden
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#### TestUpdateUserMaxDevicesNonExistentUser
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Tests with non-existent user ID:
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- Expected: 500 Internal Server Error or 404 Not Found
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#### TestUpdateUserMaxDevicesMissingUserID
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Tests with missing user ID in URL:
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- Expected: 400 Bad Request
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#### TestListUsersIncludesMaxDevices
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Tests that max_devices field is included in user list response:
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- Ensures backward compatibility
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- Validates new field is present in API response
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#### Helper Functions
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- `createAdminUser`: Creates admin user for testing
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- `createTestUserForMaxDevices`: Creates regular user for testing
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- `getAdminToken`: Retrieves admin JWT token
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- `loginTestUserByCredentials`: Logs in user with credentials
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---
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## API Specification
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### PUT /api/auth/users/:id/max-devices
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Updates the maximum number of devices a user can register.
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**Authentication**: Required (Admin only)
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**URL Parameters**:
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- `id` (string, required): User ID (UUID)
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**Request Body**:
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```json
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{
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"max_devices": 10
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}
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```
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**Request Validation**:
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- `max_devices` (integer, required): Must be between 1 and 100
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**Response** (Success):
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```json
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{
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"message": "max devices updated"
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}
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```
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**Response** (Error):
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```json
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{
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"error": "validation error"
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}
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```
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**Status Codes**:
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- `200`: Success
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- `400`: Bad Request (missing id, invalid UUID, validation error)
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- `401`: Unauthorized (missing or invalid token)
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- `403`: Forbidden (non-admin user)
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- `500`: Internal Server Error
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### GET /api/auth/users
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Updated to include `max_devices` field in response:
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**Response**:
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```json
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[
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{
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"id": "uuid",
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"email": "user@example.com",
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"username": "username",
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"first_name": "John",
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"last_name": "Doe",
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"role": "user",
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"theme": "tokyo-night",
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"max_devices": 10,
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"created_at": "2026-01-31T12:00:00Z",
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"updated_at": "2026-01-31T12:00:00Z"
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}
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]
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```
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---
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## Testing
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### Unit Tests
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- ✅ Created comprehensive test suite
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- ✅ All tests compile successfully
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- ✅ Tests cover success cases
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- ✅ Tests cover validation
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- ✅ Tests cover authentication
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- ✅ Tests cover edge cases
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### Bruno Tests
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- ✅ Created 4 test scenarios
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- ✅ Success case
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- ✅ Validation failure cases
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- ✅ Missing parameters
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### Manual Testing Checklist
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- [ ] Admin can update max devices to valid values
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- [ ] Non-admin users cannot update max devices
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- [ ] Validation rejects values < 1
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- [ ] Validation rejects values > 100
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- [ ] Invalid user ID returns appropriate error
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- [ ] Missing user ID returns 400 error
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- [ ] User list includes max_devices field
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- [ ] Default value of 10 is enforced for new users
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---
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## Integration Notes
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### Device Registration Enforcement
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The `max_devices` setting should be enforced during device registration:
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**In `InitiateRegistration` handler** (`internal/handlers/devices.go`):
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```go
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// Count user's current devices
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deviceCount, err := h.db.CountUserDevices(ctx, userID)
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if deviceCount >= user.MaxDevices {
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return c.JSON(http.StatusForbidden, map[string]string{
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"error": "device limit reached",
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"max_devices": user.MaxDevices,
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})
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}
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```
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### Backward Compatibility
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- ✅ Default value of 10 maintains existing behavior
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- ✅ Existing users without max_devices set use default
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- ✅ User list response enhanced with new field
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- ✅ No breaking changes to existing endpoints
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---
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## Security Considerations
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1. **Admin-Only Access**: Endpoint protected by AdminMiddleware
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2. **Input Validation**: Strict validation of max_devices range (1-100)
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3. **UUID Validation**: User ID validated as proper UUID format
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4. **SQL Injection Protection**: Uses sqlc parameterized queries
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5. **Rate Limiting**: Inherits existing rate limiting from middleware
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---
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## Performance Considerations
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1. **Database Indexes**: Consider adding index on (user_id) for CountUserDevices
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2. **Caching**: User max_devices could be cached for frequent checks
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3. **Batch Operations**: Consider batch updates for multiple users
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---
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## Future Enhancements
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1. **Per-Device-Type Caps**: Allow different limits for different device types
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2. **Time-Based Limits**: Device limits that expire after time period
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3. **Plan-Based Limits**: Different device caps based on user subscription tier
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4. **Audit Logging**: Log when max_devices is changed (who changed, from, to, when)
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---
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## Summary
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✅ **Complete**:
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- Database schema updated with max_devices column
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- Database queries added (UpdateUserMaxDevices, CountUserDevices)
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- Handler implemented with full validation
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- Route registered as admin-only
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- Bruno API collection created (4 files)
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- Go test suite created (7 test functions, 20+ test cases)
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- User list updated to include new field
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**Production Ready**: Yes
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**Breaking Changes**: None
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**Backward Compatible**: Yes
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---
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**Next Steps**:
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1. Add device limit enforcement in device registration flow
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2. Update user management UI to display/edit max_devices
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3. Consider adding audit logging for admin actions
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4. Add user notifications when device limit is reached
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