d-OAuth-Server/compose.yaml

# Local multi-replica validation (task 46).
#
# Three stateless app replicas against ONE Postgres + ONE Redis — the local
# analogue of `deploy/k8s`. Proves shared-state behavior: a token issued by
# one replica is usable/introspectable via another, and migrations apply
# exactly once via the one-shot `migrate` service (never per replica).
#
#   docker compose up --build --scale app=3
#   docker compose port app 8080   # per-replica host ports (assigned randomly)
#
# Validation sketch (public listener is TLS with a throwaway self-signed
# cert, so use -sk; `<port-N>` from `docker compose port`):
#
#   curl -sk https://127.0.0.1:<port-1>/.well-known/oauth-authorization-server
#   # complete an authorization-code+PKCE flow against replica 1, then
#   # introspect the token against replica 2 — shared Redis makes it work.
#
# Host ports are assigned RANDOMLY per replica (short-syntax `"8080"`), so
# `--scale app=3` never collides. The health listener (8081) is exposed, not
# published — same rule as the cluster Service.
#
# mTLS is OFF here (no `D_OAUTH_TLS__CLIENT_CA_PATH`): the L4-passthrough
# constraint is a cluster concern, documented in docs/DEPLOYMENT.md.
#
# Secrets mirror the cluster's file-mount pattern: the
# one-shot `gensecrets` service materializes DEV-ONLY placeholder values as
# 0400 files owned by 65532 in the `devsecrets` volume, mounted at
# /run/secrets; the app and migrate services read them through
# D_OAUTH_TOKEN_PEPPER_FILE / D_OAUTH_TOTP_ENCRYPTION_KEY_FILE, so no key
# material enters the process environment. Cluster secrets are never baked.

name: d-oauth

services:
  db:
    image: postgres:16
    environment:
      POSTGRES_USER: oauth
      POSTGRES_PASSWORD: oauth-dev-only
      POSTGRES_DB: oauth
    volumes:
      - pgdata:/var/lib/postgresql/data
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U oauth -d oauth"]
      interval: 5s
      timeout: 3s
      retries: 20

  redis:
    image: redis:7
    # The server asserts this contract at startup: noeviction + AOF.
    command: ["redis-server", "--appendonly", "yes", "--maxmemory-policy", "noeviction"]
    volumes:
      - redisdata:/data
    healthcheck:
      test: ["CMD", "redis-cli", "ping"]
      interval: 5s
      timeout: 3s
      retries: 20

  # One-shot: throwaway self-signed server cert for the local TLS listener.
  gencerts:
    image: alpine:3.21
    volumes:
      - certs:/certs
    command:
      - sh
      - -ec
      - |
        apk add --no-cache openssl >/dev/null
        if [ ! -f /certs/tls.crt ]; then
          openssl req -x509 -newkey rsa:2048 -nodes -days 2 \
            -keyout /certs/tls.key -out /certs/tls.crt \
            -subj "/CN=localhost" -addext "subjectAltName=DNS:localhost,IP:127.0.0.1"
        fi
        chown 65532:65532 /certs/tls.crt /certs/tls.key
        chmod 600 /certs/tls.key
        chmod 644 /certs/tls.crt

  # One-shot: DEV-ONLY pepper/TOTP key files, shaped like the cluster's tmpfs
  # secret volume (0400, owned by 65532). Values are throwaway placeholders;
  # never reuse them outside this local compose file.
  gensecrets:
    image: alpine:3.21
    volumes:
      - devsecrets:/run/secrets
    command:
      - sh
      - -ec
      - |
        if [ ! -f /run/secrets/token-pepper ]; then
          printf '%s' 'dev-only-pepper-ROTATE-IN-PROD-000000' > /run/secrets/token-pepper
          printf '%s' 'dev-only-totp-key-ROTATE-IN-PROD-000' > /run/secrets/totp-encryption-key
        fi
        chown 65532:65532 /run/secrets/token-pepper /run/secrets/totp-encryption-key
        chmod 400 /run/secrets/token-pepper /run/secrets/totp-encryption-key

  # Exactly-once migration (sqlx advisory lock). Replicas never migrate.
  migrate:
    build:
      context: .
      dockerfile: Dockerfile
    image: d-oauth-server:local
    entrypoint: ["/d-oauth-server"]
    command: ["migrate"]
    depends_on:
      gencerts:
        condition: service_completed_successfully
      gensecrets:
        condition: service_completed_successfully
      db:
        condition: service_healthy
      redis:
        condition: service_healthy
    environment:
      D_OAUTH_ISSUER: https://localhost:8080
      D_OAUTH_ENVIRONMENT: development
      D_OAUTH_BIND_ADDR: 0.0.0.0:8080
      D_OAUTH_HEALTH_ADDR: 0.0.0.0:8081
      D_OAUTH_TLS__CERT_PATH: /certs/tls.crt
      D_OAUTH_TLS__KEY_PATH: /certs/tls.key
      D_OAUTH_DATABASE__URL: postgres://oauth:oauth-dev-only@db:5432/oauth?sslmode=disable
      D_OAUTH_REDIS__URL: redis://redis:6379
      D_OAUTH_REDIS__DURABILITY: waitaof
      D_OAUTH_TOKEN_PEPPER_FILE: /run/secrets/token-pepper
      D_OAUTH_TOTP_ENCRYPTION_KEY_FILE: /run/secrets/totp-encryption-key
    volumes:
      - certs:/certs:ro
      - devsecrets:/run/secrets:ro

  app:
    build:
      context: .
      dockerfile: Dockerfile
    image: d-oauth-server:local
    depends_on:
      migrate:
        condition: service_completed_successfully
      gensecrets:
        condition: service_completed_successfully
      db:
        condition: service_healthy
      redis:
        condition: service_healthy
    environment:
      D_OAUTH_ISSUER: https://localhost:8080
      D_OAUTH_ENVIRONMENT: development
      D_OAUTH_BIND_ADDR: 0.0.0.0:8080
      D_OAUTH_HEALTH_ADDR: 0.0.0.0:8081
      D_OAUTH_TLS__CERT_PATH: /certs/tls.crt
      D_OAUTH_TLS__KEY_PATH: /certs/tls.key
      D_OAUTH_DATABASE__URL: postgres://oauth:oauth-dev-only@db:5432/oauth?sslmode=disable
      D_OAUTH_REDIS__URL: redis://redis:6379
      D_OAUTH_REDIS__DURABILITY: waitaof
      D_OAUTH_TOKEN_PEPPER_FILE: /run/secrets/token-pepper
      D_OAUTH_TOTP_ENCRYPTION_KEY_FILE: /run/secrets/totp-encryption-key
    expose:
      - 8080
      - 8081
    # Random host ports per replica: `--scale app=3` never collides.
    ports:
      - "8080"
      - "8081"
    read_only: true
    # Shell-less self-probe: no shell or curl in the distroless image.
    healthcheck:
      test: ["CMD", "/d-oauth-server", "healthcheck"]
      interval: 5s
      timeout: 3s
      retries: 20
      start_period: 10s
    volumes:
      - certs:/certs:ro
      - devsecrets:/run/secrets:ro

volumes:
  pgdata:
  redisdata:
  certs:
  devsecrets: