.github/workflows/release.yml

name: Release

on:
  release:
    types: [published]
  workflow_dispatch:
    inputs:
      tag:
        description: 'Release tag (e.g. v0.30.0)'
        required: true
        type: string

permissions:
  contents: read

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      id-token: write
    outputs:
      hashes: ${{ steps.hash.outputs.hashes }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
        with:
          fetch-depth: 0

      - name: Set up Go
        uses: actions/setup-go@f111f3307d8850f501ac008e886eec1fd1932a34 # v5.3.0
        with:
          go-version-file: 'go.mod'
          check-latest: true

      - name: Determine Release Tag
        id: tag
        env:
          TAG: ${{ github.event.release.tag_name || inputs.tag }}
        run: |
          echo "tag=${TAG}" >> "$GITHUB_OUTPUT"

      - name: Build REPL Binaries and Packages
        env:
          TAG: ${{ steps.tag.outputs.tag }}
        run: |
          mkdir -p dist
          
          # Target platforms: OS/ARCH
          PLATFORMS=(
            "linux/amd64"
            "linux/arm64"
            "darwin/amd64"
            "darwin/arm64"
            "windows/amd64"
          )
          
          for PLATFORM in "${PLATFORMS[@]}"; do
            GOOS="${PLATFORM%/*}"
            GOARCH="${PLATFORM#*/}"
            
            OUTPUT_NAME="cel-repl"
            if [ "$GOOS" = "windows" ]; then
              OUTPUT_NAME="cel-repl.exe"
            fi
            
            STAGE_DIR="dist/stage_${GOOS}_${GOARCH}"
            mkdir -p "$STAGE_DIR"
            
            echo "Building cel-repl for ${GOOS}/${GOARCH}..."
            (
              cd repl
              CGO_ENABLED=0 GOOS="$GOOS" GOARCH="$GOARCH" go build -ldflags="-s -w" -o "../${STAGE_DIR}/${OUTPUT_NAME}" ./main
            )
            
            cp LICENSE "$STAGE_DIR/"
            cp repl/main/README.md "$STAGE_DIR/"
            
            ARCHIVE_NAME="cel-repl_${TAG#v}_${GOOS}_${GOARCH}"
            if [ "$GOOS" = "windows" ]; then
              (cd "$STAGE_DIR" && zip -r "../../dist/${ARCHIVE_NAME}.zip" ./)
            else
              tar -czf "dist/${ARCHIVE_NAME}.tar.gz" -C "$STAGE_DIR" .
            fi
            
            rm -rf "$STAGE_DIR"
          done

      - name: Generate Checksums
        id: checksums
        run: |
          cd dist
          sha256sum * > checksums.txt

      - name: Install Cosign
        uses: sigstore/cosign-installer@d7d6bc7722e3daa8354c50bcb52f4837da5e9b6a # v3.8.1

      - name: Sign Checksums with Sigstore Cosign
        run: |
          cd dist
          # Keyless signing via GitHub Actions OIDC token
          cosign sign-blob --yes \
            --bundle checksums.txt.bundle \
            checksums.txt
          cosign sign-blob --yes \
            --output-signature checksums.txt.sig \
            --output-certificate checksums.txt.pem \
            checksums.txt

      - name: Upload Release Assets
        env:
          GITHUB_TOKEN: ${{ github.token }}
          TAG: ${{ steps.tag.outputs.tag }}
        run: |
          gh release upload "$TAG" dist/* --clobber

      - name: Generate SLSA Subjects
        id: hash
        run: |
          cd dist
          echo "hashes=$(sha256sum * | base64 -w0)" >> "$GITHUB_OUTPUT"

  provenance:
    needs: [build]
    permissions:
      actions: read
      id-token: write
      contents: write
    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_generic_slsa3.yml@v2.1.0
    with:
      base64-subjects: "${{ needs.build.outputs.hashes }}"
      upload-assets: true