# QA Report — Gateway Security Hardening

## Scope

- Chat HTTP auth guard hardening
- Chat WebSocket session validation
- DTO validation rules for chat and conversation payloads
- Ownership regression coverage for by-id routes

## TDD

- Required: yes
- Applied: yes
- Red step: targeted tests failed on socket session reshaping and DTO role/length mismatches
- Green step: targeted tests passed after runtime and DTO alignment

## Baseline Verification

| Command | Result | Evidence |
| --- | --- | --- |
| `pnpm --filter @mosaic/gateway test -- src/chat/__tests__/chat-security.test.ts src/__tests__/resource-ownership.test.ts` | pass | 3 test files passed, 20 tests passed |
| `pnpm typecheck` | pass | turbo completed 18/18 package typecheck tasks |
| `pnpm lint` | pass | turbo completed 18/18 package lint tasks |
| `pnpm format:check` | pass | `All matched files use Prettier code style!` |

## Situational Verification

| Acceptance Criterion | Verification Method | Evidence |
| --- | --- | --- |
| Chat controller requires auth and current-user context | source assertion test | `chat-security.test.ts` checks `@UseGuards(AuthGuard)` and `@CurrentUser() user: { id: string }` |
| WebSocket handshake requires Better Auth session | unit tests for `validateSocketSession()` | null handshake returns `null`; valid handshake returns original session object |
| Conversation messages reject non-user/assistant roles | class-validator test | `system` role fails validation |
| Conversation messages enforce a 32k max length | class-validator test | `32_001` chars fail validation |
| Chat request payload enforces a 10k max length | class-validator test | `10_001` chars fail validation |
| By-id routes reject cross-user access | ownership regression tests | conversations, projects, missions, tasks each raise `ForbiddenException` for non-owner access |

## Residual Risk

- No live HTTP or WebSocket smoke test against a running gateway process was executed in this session.