Julien Gautier
b6e43565c3
Pin the session-state architecture: the browser carries only an opaque
crypto-random session id in __Host-portal_session, signed with
SESSION_SECRET. The payload (userId, audience, curated claims, encrypted
tokens, timestamps) lives in self-hosted Redis, accessed via the standard
express-session + connect-redis pair under the NestJS Express adapter.
The id_token / access_token / refresh_token tuple is encrypted with
AES-256-GCM before being stored - per-record IV, GCM auth tag - using
SESSION_ENCRYPTION_KEY. A Redis snapshot or memory dump alone is not
enough to forge a working session; the encryption key must also be
compromised. Tampered or wrong-key records are rejected and audited.
TTL policy: idle 30 min sliding (TTL refreshed on each request) +
absolute 12 h (checked in a global interceptor, triggers DEL on expiry).
Topology: Redis Sentinel (3+ nodes) in prod with TLS and ACL; single node
in dev. Operational specifics deferred to a phase-3 infrastructure ADR.
Revocation is immediate (DEL session:{id}). A secondary index
user_sessions:{userId} supports per-user listing and force-logout. No
PostgreSQL mirror; historical trace lives in the future audit-log ADR.
decisions/README.md index updated. CLAUDE.md gains an explicit 'Sessions'
line pointing to ADR-0010.
57 lines
4.5 KiB
Markdown
57 lines
4.5 KiB
Markdown
# Architectural Decision Records
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This project records architecturally-significant decisions as **ADRs** in the [MADR 4.0.0](https://github.com/adr/madr) format. References: [adr.github.io](https://adr.github.io/).
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## Why ADRs
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ADRs capture the *why* behind a decision — context, drivers, options considered, trade-offs accepted — at the moment the decision is made. They make architecture reviewable, onboarding faster, and prevent the same debate from being re-litigated later.
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## Conventions
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- **Format:** MADR 4.0.0. Start from [template.md](template.md).
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- **Filename:** `NNNN-kebab-case-title.md`, e.g. `0007-adopt-tailwind-for-design-tokens.md`.
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- **Numbering:** globally sequential 4-digit prefix. Numbers never reset, never get reused — even when an ADR is superseded or deprecated.
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- **Layout:** flat folder. ADRs are not nested into category subfolders; topical organization happens via tags.
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- **Tags:** every ADR carries a `tags:` array in the MADR frontmatter, drawn from the [tag vocabulary](#tag-vocabulary) below. An ADR may carry several tags. Propose new tags (or renames) in the same PR that needs them; never invent ad-hoc tags inline.
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- **Status lifecycle:** `proposed` → `accepted` → optionally `deprecated` or `superseded by [ADR-NNNN](NNNN-other.md)`. Update the YAML frontmatter; never delete an ADR.
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- **Index maintenance:** every ADR addition or status change must update the [Index](#index) below in the same commit.
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## When to write an ADR
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Write one whenever a development decision is non-trivial: tool or library choice, framework pattern, security control, perf budget, a11y target, naming convention, deprecation, breaking change, or any choice that future contributors would benefit from understanding the *why* of.
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## Tag vocabulary
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The vocabulary below is the source of truth. It is intentionally coarse — propose extensions only when an existing tag genuinely doesn't fit, and avoid overly narrow tags.
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| Tag | Scope |
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| ---------------- | ----- |
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| `frontend` | UI, Angular, components, design system, client-side state |
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| `backend` | API, BFF, server-side services |
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| `security` | AuthN, AuthZ, sessions, CSP, dependency scanning, secret management |
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| `performance` | Perf budgets, caching, bundle size, Lighthouse |
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| `accessibility` | WCAG, a11y testing, keyboard, ARIA, contrast |
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| `infrastructure` | CI/CD, hosting, deployment, runtime |
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| `observability` | Logs, metrics, traces, correlation IDs, monitoring |
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| `data` | Persistence, schemas, migrations, data flow |
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| `process` | Team conventions, workflows, repo policy |
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> _Status: starter vocabulary, to be refined as ADRs accumulate. Update this table whenever a tag is added, renamed, or retired._
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## Index
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ADRs are listed in numerical order. To slice by topic, filter on the `Tags` column.
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| # | Title | Status | Tags | Date |
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| ---- | ----- | ------ | ---- | ---- |
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| [0001](0001-use-adrs-to-record-architectural-decisions.md) | Use ADRs to record architectural decisions | accepted | `process` | 2026-04-29 |
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| [0002](0002-adopt-nx-monorepo-apps-preset.md) | Adopt Nx monorepo with the `apps` preset | accepted | `infrastructure`, `frontend`, `backend` | 2026-04-29 |
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| [0003](0003-workspace-and-app-naming-convention.md) | Workspace and app naming convention | accepted | `process` | 2026-04-29 |
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| [0004](0004-frontend-stack-angular-csr-zoneless-signals.md) | Frontend stack — Angular (latest LTS), standalone, zoneless, Signals, CSR-only, Vitest | accepted | `frontend` | 2026-04-29 |
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| [0005](0005-backend-stack-nestjs.md) | Backend stack — NestJS over Express, Fastify, Hono | accepted | `backend` | 2026-04-29 |
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| [0006](0006-persistence-postgresql-prisma.md) | Persistence — PostgreSQL with Prisma | accepted | `data`, `backend` | 2026-04-29 |
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| [0007](0007-pre-commit-hooks-and-conventional-commits.md) | Pre-commit hooks and Conventional Commits | accepted | `process` | 2026-04-29 |
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| [0008](0008-identity-model-entra-workforce-dual-audience.md) | Identity model — multi-tenant Entra ID for workforce, dual-audience design for future External ID | accepted | `security`, `data` | 2026-04-29 |
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| [0009](0009-auth-flow-oidc-pkce-msal-node.md) | Authentication flow — OIDC Authorization Code + PKCE via MSAL Node, BFF session pattern | accepted | `security`, `backend` | 2026-04-29 |
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| [0010](0010-session-management-redis.md) | Session management — opaque session IDs in cookies, payload in self-hosted Redis with AES-GCM at rest | accepted | `security`, `backend`, `infrastructure` | 2026-04-29 |
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