name: Release

on:
  push:
    tags:
      - 'v*.*.*'

env:
  # https://github.com/actions/setup-go/issues/491
  GOTOOLCHAIN: local

permissions:
  contents: read

jobs:
  verify-tag:
    name: Verify Tag Signature and Approvals
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
      issues: write

    outputs:
      verification_passed: ${{ steps.verify.outputs.passed }}
      tag_version: ${{ steps.info.outputs.version }}
      proposal_issue_number: ${{ steps.find_proposal.outputs.result && fromJson(steps.find_proposal.outputs.result).number || '' }}

    # Values from the event, step outputs and API results are only ever
    # passed through env:, never interpolated as expressions into run: or
    # script: bodies.
    steps:
      # Validate the tag name before anything else uses it. Git allows
      # characters like $, ( and ; in tag names that match the v*.*.* trigger,
      # and the tag name ends up in shell commands (including GoReleaser hooks).
      - name: Validate tag name
        run: |
          if [[ ! "$GITHUB_REF" =~ ^refs/tags/v[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.]+)?$ ]]; then
            echo "❌ Refusing to release $GITHUB_REF: not a vMAJOR.MINOR.PATCH[-PRERELEASE] tag"
            exit 1
          fi

      - name: Checkout code
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          fetch-depth: 0
      # Force fetch upstream tags -- because 65 minutes
      # tl;dr: actions/checkout@v3 runs this line:
      #   git -c protocol.version=2 fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin +ebc278ec98bb24f2852b61fde2a9bf2e3d83818b:refs/tags/
      # which makes its own local lightweight tag, losing all the annotations in the process. Our earlier script ran:
      #   git fetch --prune --unshallow
      # which doesn't overwrite that tag because that would be destructive.
      # Credit to @francislavoie for the investigation.
      # https://github.com/actions/checkout/issues/290#issuecomment-680260080
      - name: Force fetch upstream tags
        run: git fetch --tags --force

      - name: Get tag info
        id: info
        run: |
          echo "version=${GITHUB_REF#refs/tags/}" >> "$GITHUB_OUTPUT"
          echo "sha=$(git rev-parse HEAD)" >> "$GITHUB_OUTPUT"

       # https://github.community/t5/GitHub-Actions/How-to-get-just-the-tag-name/m-p/32167/highlight/true#M1027
      - name: Print Go version and environment
        id: vars
        run: |
          printf "Using go at: $(which go)\n"
          printf "Go version: $(go version)\n"
          printf "\n\nGo environment:\n\n"
          go env
          printf "\n\nSystem environment:\n\n"
          env
          echo "version_tag=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_OUTPUT
          echo "short_sha=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT

          # Add "pip install" CLI tools to PATH
          echo ~/.local/bin >> $GITHUB_PATH

          # Parse semver
          TAG=${GITHUB_REF/refs\/tags\//}
          SEMVER_RE='[^0-9]*\([0-9]*\)[.]\([0-9]*\)[.]\([0-9]*\)\([0-9A-Za-z\.-]*\)'
          TAG_MAJOR=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\1#"`
          TAG_MINOR=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\2#"`
          TAG_PATCH=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\3#"`
          TAG_SPECIAL=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\4#"`
          echo "tag_major=${TAG_MAJOR}" >> $GITHUB_OUTPUT
          echo "tag_minor=${TAG_MINOR}" >> $GITHUB_OUTPUT
          echo "tag_patch=${TAG_PATCH}" >> $GITHUB_OUTPUT
          echo "tag_special=${TAG_SPECIAL}" >> $GITHUB_OUTPUT

      - name: Validate commits and tag signatures
        id: verify
        env:
          signing_keys: ${{ secrets.SIGNING_KEYS }}
          TAG: ${{ steps.vars.outputs.version_tag }}
        run: |
          # Read the string into an array, splitting by IFS
          IFS=";" read -ra keys_collection <<< "$signing_keys"

          # ref: https://docs.github.com/en/actions/reference/workflows-and-actions/contexts#example-usage-of-the-runner-context
          touch "$RUNNER_TEMP/allowed_signers"

          # Iterate and print the split elements
          for item in "${keys_collection[@]}"; do

            # trim leading whitespaces
            item="${item##*( )}"

            # trim trailing whitespaces
            item="${item%%*( )}"

            IFS=" " read -ra key_components <<< "$item"
            # git wants it in format: email address, type, public key
            # ssh has it in format: type, public key, email address
            echo "${key_components[2]} namespaces=\"git\" ${key_components[0]} ${key_components[1]}" >> "$RUNNER_TEMP/allowed_signers"
          done

          git config set --global gpg.ssh.allowedSignersFile "$RUNNER_TEMP/allowed_signers"

          echo "Verifying the tag: $TAG"

          # Verify the tag is signed
          if ! git verify-tag -v "$TAG" 2>&1; then
            echo "❌ Tag verification failed!"
            echo "passed=false" >> $GITHUB_OUTPUT
            git push --delete origin "$TAG"
            exit 1
          fi
          # Run it again to capture the output
          git verify-tag -v "$TAG" 2>&1 | tee /tmp/verify-output.txt;

          # SSH verification output typically includes the key fingerprint
          # Use GNU grep with Perl regex for cleaner extraction (Linux environment)
          KEY_SHA256=$(grep -oP "SHA256:[\"']?\K[A-Za-z0-9+/=]+(?=[\"']?)" /tmp/verify-output.txt | head -1 || echo "")

          if [ -z "$KEY_SHA256" ]; then
            # Try alternative pattern with "key" prefix
            KEY_SHA256=$(grep -oP "key SHA256:[\"']?\K[A-Za-z0-9+/=]+(?=[\"']?)" /tmp/verify-output.txt | head -1 || echo "")
          fi

          if [ -z "$KEY_SHA256" ]; then
            # Fallback: extract any base64-like string (40+ chars)
            KEY_SHA256=$(grep -oP '[A-Za-z0-9+/]{40,}=?' /tmp/verify-output.txt | head -1 || echo "")
          fi

          if [ -z "$KEY_SHA256" ]; then
            echo "Somehow could not extract SSH key fingerprint from git verify-tag output"
            echo "Cancelling flow and deleting tag"
            echo "passed=false" >> $GITHUB_OUTPUT
            git push --delete origin "$TAG"
            exit 1
          fi

          echo "✅ Tag verification succeeded!"
          echo "passed=true" >> $GITHUB_OUTPUT
          echo "key_id=$KEY_SHA256" >> $GITHUB_OUTPUT

      # Fails closed: there must be exactly one open proposal for this exact
      # version, with enough maintainer approvals of its current head commit.
      # The tag is left in place on failure, so the job can be re-run once
      # the proposal is approved.
      - name: Find related release proposal
        id: find_proposal
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        env:
          TAG: ${{ steps.vars.outputs.version_tag }}
          MAINTAINER_LOGINS: ${{ secrets.MAINTAINER_LOGINS }}
        with:
          script: |
            const { checkProposal, REQUIRED_APPROVALS } = require(`${process.env.GITHUB_WORKSPACE}/.github/scripts/release-proposal.js`);

            const { pr, targetCommit, approvers, approved } = await checkProposal({
              github, context, version: process.env.TAG, maintainerLogins: process.env.MAINTAINER_LOGINS,
            });
            console.log(`Found proposal PR #${pr.number}, for commit ${targetCommit}`);
            console.log(`Maintainer approvals of ${pr.head.sha}: ${approvers.join(', ') || 'none'}`);

            if (!approved) {
              core.setFailed(`Proposal #${pr.number} has ${approvers.length} maintainer approvals of its current head commit; ${REQUIRED_APPROVALS} are required`);
              return;
            }

            return {
              number: pr.number,
              approvals: approvers.length,
              approvers: approvers.map(login => `@${login}`).join(', '),
              proposedCommit: targetCommit
            };
          result-encoding: json

      - name: Verify proposal commit
        env:
          PROPOSED_COMMIT: ${{ fromJson(steps.find_proposal.outputs.result).proposedCommit }}
          CURRENT_COMMIT: ${{ steps.info.outputs.sha }}
          TAG: ${{ steps.vars.outputs.version_tag }}
        run: |
          echo "Proposed commit: $PROPOSED_COMMIT"
          echo "Current commit: $CURRENT_COMMIT"

          # Both are full SHAs, so compare them exactly
          if [[ ! "$PROPOSED_COMMIT" =~ ^[0-9a-f]{40}$ ]]; then
            echo "❌ Proposal has no valid target commit: $PROPOSED_COMMIT"
            exit 1
          fi
          if [ "$PROPOSED_COMMIT" != "$CURRENT_COMMIT" ]; then
            echo "❌ Commit mismatch!"
            echo "The tag points to commit $CURRENT_COMMIT but the proposal was for $PROPOSED_COMMIT"
            echo "This indicates an error in tag creation."
            # Delete the tag remotely
            git push --delete origin "$TAG"
            echo "Tag $TAG has been deleted"
            exit 1
          fi

          echo "✅ Commit hash matches proposal"

      - name: Update release proposal PR
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        env:
          RESULT: ${{ steps.find_proposal.outputs.result }}
          TAG: ${{ steps.info.outputs.version }}
          KEY_ID: ${{ steps.verify.outputs.key_id }}
          SHA: ${{ steps.info.outputs.sha }}
        with:
          script: |
            const result = JSON.parse(process.env.RESULT);

            // Add in-progress label
            await github.rest.issues.addLabels({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: result.number,
              labels: ['release-in-progress']
            });

            // Remove approved label if present
            try {
              await github.rest.issues.removeLabel({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: result.number,
                name: 'approved'
              });
            } catch (e) {
              console.log('Approved label not found:', e.message);
            }

            const commentBody = [
              '## 🚀 Release Workflow Started',
              '',
              `- **Tag:** ${process.env.TAG}`,
              `- **Signed by key:** ${process.env.KEY_ID}`,
              `- **Commit:** ${process.env.SHA}`,
              `- **Approved by:** ${result.approvers}`,
              '',
              'Release workflow is now running. This PR will be updated when the release is published.'
            ].join('\n');

            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: result.number,
              body: commentBody
            });

      - name: Summary
        env:
          PROPOSED_COMMIT: ${{ fromJson(steps.find_proposal.outputs.result).proposedCommit }}
          APPROVERS: ${{ fromJson(steps.find_proposal.outputs.result).approvers }}
          TAG: ${{ steps.info.outputs.version }}
          SHA: ${{ steps.info.outputs.sha }}
          KEY_ID: ${{ steps.verify.outputs.key_id }}
        run: |
          {
            echo "## Tag Verification Summary 🔐"
            echo ""
            echo "- **Tag:** $TAG"
            echo "- **Commit:** $SHA"
            echo "- **Proposed Commit:** $PROPOSED_COMMIT"
            echo "- **Signature:** ✅ Verified"
            echo "- **Signed by:** $KEY_ID"
            echo "- **Approvals:** ✅ Sufficient"
            echo "- **Approved by:** $APPROVERS"
            echo ""
            echo "Proceeding with release build..."
          } >> "$GITHUB_STEP_SUMMARY"

  release:
    name: Release
    needs: verify-tag
    if: ${{ needs.verify-tag.outputs.verification_passed == 'true' }}
    strategy:
      matrix:
        os: 
          - ubuntu-latest
        go: 
          - '1.27'

        include:
        # Set the minimum Go patch version for the given Go minor
        # Usable via ${{ matrix.GO_SEMVER }}
        - go: '1.27'
          GO_SEMVER: '~1.27.0'

    runs-on: ${{ matrix.os }}
    # https://github.com/sigstore/cosign/issues/1258#issuecomment-1002251233
    # https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/about-security-hardening-with-openid-connect#adding-permissions-settings
    permissions:
      id-token: write
      # https://docs.github.com/en/rest/overview/permissions-required-for-github-apps#permission-on-contents
      # "Releases" is part of `contents`, so it needs the `write`
      contents: write
      issues: write
      pull-requests: write

    steps:
    # Same check as in verify-tag: the tag name ends up in GoReleaser's
    # shell hooks via $TAG.
    - name: Validate tag name
      run: |
        if [[ ! "$GITHUB_REF" =~ ^refs/tags/v[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.]+)?$ ]]; then
          echo "❌ Refusing to release $GITHUB_REF: not a vMAJOR.MINOR.PATCH[-PRERELEASE] tag"
          exit 1
        fi

    - name: Harden the runner (Audit all outbound calls)
      uses: step-security/harden-runner@46b06cea07f9e64621fdf066ba77ac6915163d43 # v2.22.3
      with:
        egress-policy: audit

    - name: Checkout code
      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
      with:
        fetch-depth: 0

    - name: Install Go
      uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
      with:
        go-version: ${{ matrix.GO_SEMVER }}
        check-latest: true

    # Force fetch upstream tags -- because 65 minutes
    # tl;dr: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v4.2.2 runs this line:
    #   git -c protocol.version=2 fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin +ebc278ec98bb24f2852b61fde2a9bf2e3d83818b:refs/tags/
    # which makes its own local lightweight tag, losing all the annotations in the process. Our earlier script ran:
    #   git fetch --prune --unshallow
    # which doesn't overwrite that tag because that would be destructive.
    # Credit to @francislavoie for the investigation.
    # https://github.com/actions/checkout/issues/290#issuecomment-680260080
    - name: Force fetch upstream tags
      run: git fetch --tags --force

    # https://github.community/t5/GitHub-Actions/How-to-get-just-the-tag-name/m-p/32167/highlight/true#M1027
    - name: Print Go version and environment
      id: vars
      run: |
        printf "Using go at: $(which go)\n"
        printf "Go version: $(go version)\n"
        printf "\n\nGo environment:\n\n"
        go env
        printf "\n\nSystem environment:\n\n"
        env
        echo "version_tag=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_OUTPUT
        echo "short_sha=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT

        # Add "pip install" CLI tools to PATH
        echo ~/.local/bin >> $GITHUB_PATH

        # Parse semver
        TAG=${GITHUB_REF/refs\/tags\//}
        SEMVER_RE='[^0-9]*\([0-9]*\)[.]\([0-9]*\)[.]\([0-9]*\)\([0-9A-Za-z\.-]*\)'
        TAG_MAJOR=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\1#"`
        TAG_MINOR=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\2#"`
        TAG_PATCH=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\3#"`
        TAG_SPECIAL=`echo ${TAG#v} | sed -e "s#$SEMVER_RE#\4#"`
        echo "tag_major=${TAG_MAJOR}" >> $GITHUB_OUTPUT
        echo "tag_minor=${TAG_MINOR}" >> $GITHUB_OUTPUT
        echo "tag_patch=${TAG_PATCH}" >> $GITHUB_OUTPUT
        echo "tag_special=${TAG_SPECIAL}" >> $GITHUB_OUTPUT

    # Cloudsmith CLI tooling for pushing releases
    # See https://help.cloudsmith.io/docs/cli
    - name: Install Cloudsmith CLI
      run: pip install --upgrade cloudsmith-cli

    - name: Install Cosign
      uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6 # v4.1.2
    - name: Cosign version
      run: cosign version
    - name: Install Syft
      uses: anchore/sbom-action/download-syft@66cbf4bc1f1c0d2edc94016e65bc221b6bb0ad6c # main
    - name: Syft version
      run: syft version
    - name: Install xcaddy
      run: |
        go install github.com/caddyserver/xcaddy/cmd/xcaddy@latest
        xcaddy version
    # Generate the draft's notes in the same format as GitHub's "Generate
    # release notes" button, compared against the previous *published*
    # release by version (not the previous tag, which may be an abandoned
    # release attempt), and without PRs that already shipped in it as
    # backports. GoReleaser's own changelog can do neither.
    - name: Generate release notes
      env:
        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        TAG: ${{ steps.vars.outputs.version_tag }}
        NOTES_FILE: ${{ runner.temp }}/release-notes.md
      run: |
        PREVIOUS_RELEASE=$(.github/scripts/previous-release.sh "$TAG")
        echo "Previous published release: ${PREVIOUS_RELEASE:-none}"
        .github/scripts/release-notes.sh "$TAG" "$TAG" "$PREVIOUS_RELEASE" > "$NOTES_FILE"
        cat "$NOTES_FILE"

    # GoReleaser will take care of publishing those artifacts into the release
    - name: Run GoReleaser
      uses: goreleaser/goreleaser-action@a4f02ab5355a589de60d917a659ce617ed19b3de # v7.3.0
      with:
        version: latest
        args: release --clean --timeout 60m --release-notes ${{ runner.temp }}/release-notes.md
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        TAG: ${{ steps.vars.outputs.version_tag }}

    # Only publish on non-special tags (e.g. non-beta)
    # We will continue to push to Gemfury for the foreseeable future, although
    # Cloudsmith is probably better, to not break things for existing users of Gemfury.
    # See https://gemfury.com/caddy/deb:caddy
    - name: Publish .deb to Gemfury
      if: ${{ steps.vars.outputs.tag_special == '' }}
      env:
        GEMFURY_PUSH_TOKEN: ${{ secrets.GEMFURY_PUSH_TOKEN }}
      run: |
        for filename in dist/*.deb; do
          # armv6 and armv7 are both "armhf" so we can skip the duplicate
          if [[ "$filename" == *"armv6"* ]]; then
            echo "Skipping $filename"
            continue
          fi

          curl -F package=@"$filename" https://${GEMFURY_PUSH_TOKEN}:@push.fury.io/caddy/
        done

    # Publish only special tags (unstable/beta/rc) to the "testing" repo
    # See https://cloudsmith.io/~caddy/repos/testing/
    - name: Publish .deb to Cloudsmith (special tags)
      if: ${{ steps.vars.outputs.tag_special != '' }}
      env:
        CLOUDSMITH_API_KEY: ${{ secrets.CLOUDSMITH_API_KEY }}
      run: |
        for filename in dist/*.deb; do
          # armv6 and armv7 are both "armhf" so we can skip the duplicate
          if [[ "$filename" == *"armv6"* ]]; then
            echo "Skipping $filename"
            continue
          fi

          echo "Pushing $filename to 'testing'"
          cloudsmith push deb caddy/testing/any-distro/any-version $filename
        done

    # Publish stable tags to Cloudsmith to both repos, "stable" and "testing"
    # See https://cloudsmith.io/~caddy/repos/stable/
    - name: Publish .deb to Cloudsmith (stable tags)
      if: ${{ steps.vars.outputs.tag_special == '' }}
      env:
        CLOUDSMITH_API_KEY: ${{ secrets.CLOUDSMITH_API_KEY }}
      run: |
        for filename in dist/*.deb; do
          # armv6 and armv7 are both "armhf" so we can skip the duplicate
          if [[ "$filename" == *"armv6"* ]]; then
            echo "Skipping $filename"
            continue
          fi

          echo "Pushing $filename to 'stable'"
          cloudsmith push deb caddy/stable/any-distro/any-version $filename

          echo "Pushing $filename to 'testing'"
          cloudsmith push deb caddy/testing/any-distro/any-version $filename
        done

    - name: Update release proposal PR
      if: needs.verify-tag.outputs.proposal_issue_number != ''
      uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
      env:
        PROPOSAL_NUMBER: ${{ needs.verify-tag.outputs.proposal_issue_number }}
      with:
        script: |
          const prNumber = parseInt(process.env.PROPOSAL_NUMBER, 10);
          
          if (prNumber) {
            // Get PR details to find the branch
            const pr = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: prNumber
            });
            
            const branchName = pr.data.head.ref;
            
            // Remove in-progress label
            try {
              await github.rest.issues.removeLabel({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: prNumber,
                name: 'release-in-progress'
              });
            } catch (e) {
              console.log('Label not found:', e.message);
            }
            
            // Add released label
            await github.rest.issues.addLabels({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
              labels: ['released']
            });
            
            // Add final comment
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber,
              body: '## ✅ Release Published\n\nThe release has been successfully published and is now available.'
            });
            
            // Close the PR if it's still open
            if (pr.data.state === 'open') {
              await github.rest.pulls.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: prNumber,
                state: 'closed'
              });
              console.log(`Closed PR #${prNumber}`);
            }
            
            // Delete the branch
            try {
              await github.rest.git.deleteRef({
                owner: context.repo.owner,
                repo: context.repo.repo,
                ref: `heads/${branchName}`
              });
              console.log(`Deleted branch: ${branchName}`);
            } catch (e) {
              console.log(`Could not delete branch ${branchName}: ${e.message}`);
            }
          }