name: Docker

on:
  push:
    branches: [main]
    tags: ['v*.*.*']
    paths-ignore:
      - '**/*.md'
      - 'docs/**'
      - 'demo/**'
      - '.gitignore'
      - 'LICENSE'
  pull_request:
    paths-ignore:
      - '**/*.md'
      - 'docs/**'
      - 'demo/**'
      - '.gitignore'
      - 'LICENSE'
  workflow_dispatch:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

concurrency:
  group: docker-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:
    name: build & push image
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      # Required for cosign keyless signing of pushed images.
      id-token: write

    steps:
      - uses: actions/checkout@v4

      - name: Set up QEMU
        # Only needed to cross-build arm64, which only tagged releases do.
        if: startsWith(github.ref, 'refs/tags/')
        uses: docker/setup-qemu-action@v3

      - name: Set up Buildx
        uses: docker/setup-buildx-action@v3

      # A pull request from a fork cannot read the registry secret, so builds are
      # verified without pushing. Only trusted refs publish.
      - name: Log in to GHCR
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Derive tags and labels
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=ref,event=pr
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha,format=short
            type=raw,value=latest,enable={{is_default_branch}}
          labels: |
            org.opencontainers.image.title=Freeway
            org.opencontainers.image.description=Self-hosted OpenAI-compatible gateway for free-tier LLM providers

      - name: Build and push
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          # Multi-arch on releases; native-only otherwise, since emulating
          # arm64 is most of the build time and nothing consumes it per-commit.
          platforms: ${{ startsWith(github.ref, 'refs/tags/') && 'linux/amd64,linux/arm64' || 'linux/amd64' }}
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          provenance: true
          sbom: true

      # Smoke-test the image we just built, on the native arch only — an arm64
      # image cannot be started on an amd64 runner without emulation overhead.
      - name: Smoke-test the image
        if: github.event_name != 'pull_request'
        run: |
          set -euo pipefail
          IMAGE="$(echo '${{ steps.meta.outputs.tags }}' | head -n1)"
          # The gateway refuses to bind a public interface with no virtual keys —
          # a deliberate failsafe, and the container binds 0.0.0.0. CI has to
          # supply one, exactly as a real deployment would.
          docker run -d --name freeway-smoke -p 8787:8787 --platform linux/amd64 \
            -e FREEWAY_KEYS=fw-ci-smoke-only \
            -e FREEWAY_ADMIN_KEY=fw-ci-admin-only \
            "$IMAGE"

          for i in $(seq 1 30); do
            if curl -fsS http://127.0.0.1:8787/healthz >/dev/null 2>&1; then
              echo "gateway is healthy"
              curl -fsS http://127.0.0.1:8787/healthz; echo

              # An unauthenticated call must be refused, and an app key must not
              # reach the admin surface. If either regresses, the image is unsafe
              # to publish however green everything else looks.
              code=$(curl -s -o /dev/null -w '%{http_code}' -X POST http://127.0.0.1:8787/v1/chat/completions \
                -H 'content-type: application/json' -d '{"model":"auto","messages":[]}')
              [ "$code" = "401" ] || { echo "expected 401 without a key, got $code" >&2; docker rm -f freeway-smoke; exit 1; }

              code=$(curl -s -o /dev/null -w '%{http_code}' http://127.0.0.1:8787/api/logs \
                -H 'authorization: Bearer fw-ci-smoke-only')
              [ "$code" = "403" ] || { echo "expected 403 for an inference key on /api, got $code" >&2; docker rm -f freeway-smoke; exit 1; }

              echo "auth boundaries hold"
              docker rm -f freeway-smoke
              exit 0
            fi
            sleep 1
          done

          echo "gateway did not become healthy in 30s" >&2
          docker logs freeway-smoke >&2
          docker rm -f freeway-smoke
          exit 1

      - name: Summary
        if: github.event_name != 'pull_request'
        run: |
          {
            echo "### Image published"
            echo
            echo '```'
            echo '${{ steps.meta.outputs.tags }}'
            echo '```'
            echo
            echo "digest: \`${{ steps.build.outputs.digest }}\`"
          } >> "$GITHUB_STEP_SUMMARY"