---
title: Auth Specification
type: product
status: complete
depends_on: []
---

# Unit 01: Auth Specification

Define the behavioral specification and acceptance criteria for the OAuth authentication flow.

## Completion Criteria

- [x] Happy path specified: user clicks provider button -> redirect -> authorize -> callback -> session created -> redirect to dashboard
- [x] Error scenario: invalid authorization code -> 400 error with user-friendly message -> redirect to login with error
- [x] Error scenario: expired authorization code -> redirect to login with "session expired, please try again" message
- [x] Error scenario: user denies authorization at provider -> redirect to login with "authorization cancelled" message
- [x] Rate limiting: callback endpoint returns 429 with `Retry-After` header at 100 requests/minute per IP
- [x] Data contract: `POST /auth/callback/:provider` request/response schema with field types, required fields, and validation rules
- [x] Data contract: `POST /auth/refresh` request/response schema
- [x] Data contract: `POST /auth/logout` request/response schema
