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 || '' }}
    
    steps:
      - name: Checkout code
        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
        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: ${{ secrets.SIGNING_KEYS }}
        run: |
          # Read the string into an array, splitting by IFS
          IFS=";" read -ra keys_collection <<< "$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: ${{ steps.vars.outputs.version_tag }}"
          
          # Verify the tag is signed
          if ! git verify-tag -v "${{ steps.vars.outputs.version_tag }}" 2>&1; then
            echo "❌ Tag verification failed!"
            echo "passed=false" >> $GITHUB_OUTPUT
            git push --delete origin "${{ steps.vars.outputs.version_tag }}"
            exit 1
          fi
          # Run it again to capture the output
          git verify-tag -v "${{ steps.vars.outputs.version_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" >> $GITHUB_OUTPUT
            git push --delete origin "${{ steps.vars.outputs.version_tag }}"
            exit 1
          fi

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

      - name: Find related release proposal
        id: find_proposal
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          script: |
            const version = '${{ steps.vars.outputs.version_tag }}';
            
            // Search for PRs with release-proposal label that match this version
            const prs = await github.rest.pulls.list({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open', // Changed to 'all' to find both open and closed PRs
              sort: 'updated',
              direction: 'desc'
            });
            
            // Find the most recent PR for this version
            const proposal = prs.data.find(pr => 
              pr.title.includes(version) && 
              pr.labels.some(label => label.name === 'release-proposal')
            );
            
            if (!proposal) {
              console.log(`⚠️  No release proposal PR found for ${version}`);
              console.log('This might be a hotfix or emergency release');
              return { number: null, approved: true, approvals: 0, proposedCommit: null };
            }
            
            console.log(`Found proposal PR #${proposal.number} for version ${version}`);
            
            // Extract commit hash from PR body
            const commitMatch = proposal.body.match(/\*\*Target Commit:\*\*\s*`([a-f0-9]+)`/);
            const proposedCommit = commitMatch ? commitMatch[1] : null;
            
            if (proposedCommit) {
              console.log(`Proposal was for commit: ${proposedCommit}`);
            } else {
              console.log('⚠️  No target commit hash found in PR body');
            }
            
            // Get PR reviews to extract approvers
            let approvers = 'Validated by automation';
            let approvalCount = 2; // Minimum required
            
            try {
              const reviews = await github.rest.pulls.listReviews({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: proposal.number
              });
              
              // Get latest review per user and filter for approvals
              const latestReviewsByUser = {};
              reviews.data.forEach(review => {
                const username = review.user.login;
                if (!latestReviewsByUser[username] || new Date(review.submitted_at) > new Date(latestReviewsByUser[username].submitted_at)) {
                  latestReviewsByUser[username] = review;
                }
              });
              
              const approvalReviews = Object.values(latestReviewsByUser).filter(review => 
                review.state === 'APPROVED'
              );
              
              if (approvalReviews.length > 0) {
                approvers = approvalReviews.map(r => '@' + r.user.login).join(', ');
                approvalCount = approvalReviews.length;
                console.log(`Found ${approvalCount} approvals from: ${approvers}`);
              }
            } catch (error) {
              console.log(`Could not fetch reviews: ${error.message}`);
            }
            
            return {
              number: proposal.number,
              approved: true,
              approvals: approvalCount,
              approvers: approvers,
              proposedCommit: proposedCommit
            };
          result-encoding: json

      - name: Verify proposal commit
        run: |
          APPROVALS='${{ steps.find_proposal.outputs.result }}'
          
          # Parse JSON
          PROPOSED_COMMIT=$(echo "$APPROVALS" | jq -r '.proposedCommit')
          CURRENT_COMMIT="${{ steps.info.outputs.sha }}"
          
          echo "Proposed commit: $PROPOSED_COMMIT"
          echo "Current commit: $CURRENT_COMMIT"
          
          # Check if commits match (if proposal had a target commit)
          if [ "$PROPOSED_COMMIT" != "null" ] && [ -n "$PROPOSED_COMMIT" ]; then
            # Normalize both commits to full SHA for comparison
            PROPOSED_FULL=$(git rev-parse "$PROPOSED_COMMIT" 2>/dev/null || echo "")
            CURRENT_FULL=$(git rev-parse "$CURRENT_COMMIT" 2>/dev/null || echo "")
            
            if [ -z "$PROPOSED_FULL" ]; then
              echo "⚠️  Could not resolve proposed commit: $PROPOSED_COMMIT"
            elif [ "$PROPOSED_FULL" != "$CURRENT_FULL" ]; then
              echo "❌ Commit mismatch!"
              echo "The tag points to commit $CURRENT_FULL but the proposal was for $PROPOSED_FULL"
              echo "This indicates an error in tag creation."
              # Delete the tag remotely
              git push --delete origin "${{ steps.vars.outputs.version_tag }}"
              echo "Tag ${{steps.vars.outputs.version_tag}} has been deleted"
              exit 1
            else
              echo "✅ Commit hash matches proposal"
            fi
          else
            echo "⚠️  No target commit found in proposal (might be legacy release)"
          fi
          
          echo "✅ Tag verification completed"

      - name: Update release proposal PR
        if: fromJson(steps.find_proposal.outputs.result).number != null
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          script: |
            const result = ${{ steps.find_proposal.outputs.result }};
            
            if (result.number) {
              // 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:** ${{ steps.info.outputs.version }}',
                '- **Signed by key:** ${{ steps.verify.outputs.key_id }}',
                '- **Commit:** ${{ steps.info.outputs.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
        run: |
          APPROVALS='${{ steps.find_proposal.outputs.result }}'
          PROPOSED_COMMIT=$(echo "$APPROVALS" | jq -r '.proposedCommit // "N/A"')
          APPROVERS=$(echo "$APPROVALS" | jq -r '.approvers // "N/A"')
          
          echo "## Tag Verification Summary 🔐" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "- **Tag:** ${{ steps.info.outputs.version }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Commit:** ${{ steps.info.outputs.sha }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Proposed Commit:** $PROPOSED_COMMIT" >> $GITHUB_STEP_SUMMARY
          echo "- **Signature:** ✅ Verified" >> $GITHUB_STEP_SUMMARY
          echo "- **Signed by:** ${{ steps.verify.outputs.key_id }}" >> $GITHUB_STEP_SUMMARY
          echo "- **Approvals:** ✅ Sufficient" >> $GITHUB_STEP_SUMMARY
          echo "- **Approved by:** $APPROVERS" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          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: 
          - '1.25'

        include:
        # Set the minimum Go patch version for the given Go minor
        # Usable via ${{ matrix.GO_SEMVER }}
        - go: '1.25'
          GO_SEMVER: '~1.25.0'

    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:
    - name: Harden the runner (Audit all outbound calls)
      uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
      with:
        egress-policy: audit

    - name: Checkout code
      uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
      with:
        fetch-depth: 0

    - name: Install Go
      uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
      with:
        go-version: ${{ matrix.GO_SEMVER }}
        check-latest: true

    # Force fetch upstream tags -- because 65 minutes
    # tl;dr: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # 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@d7543c93d881b35a8faa02e8e3605f69b7a1ce62 # main
    - name: Cosign version
      run: cosign version
    - name: Install Syft
      uses: anchore/sbom-action/download-syft@f8bdd1d8ac5e901a77a92f111440fdb1b593736b # main
    - name: Syft version
      run: syft version
    - name: Install xcaddy
      run: |
        go install github.com/caddyserver/xcaddy/cmd/xcaddy@latest
        xcaddy version
    # GoReleaser will take care of publishing those artifacts into the release
    - name: Run GoReleaser
      uses: goreleaser/goreleaser-action@e435ccd777264be153ace6237001ef4d979d3a7a # v6.4.0
      with:
        version: latest
        args: release --clean --timeout 60m
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        TAG: ${{ steps.vars.outputs.version_tag }}
        COSIGN_EXPERIMENTAL: 1

    # 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@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
      with:
        script: |
          const prNumber = parseInt('${{ needs.verify-tag.outputs.proposal_issue_number }}');
          
          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}`);
            }
          }