stack-chan

name: Deploy Cloudflare PR Preview

on:
  workflow_dispatch:
    inputs:
      pull_request_number:
        description: Closed pull request number to clean up
        required: true
        type: number
      keep_deployment_id:
        description: Closed-page Cloudflare deployment ID to retain
        required: true
        type: string
  workflow_run:
    workflows:
      - Bundle Stack-chan Firmware
    types:
      - completed
  pull_request_target:
    types:
      - closed

permissions: {}

concurrency:
  group: cloudflare-preview-${{ github.event.workflow_run.head_repository.id || github.event.pull_request.head.repo.id || github.repository_id }}-${{ github.event.workflow_run.head_branch || github.event.pull_request.head.ref || github.event.inputs.pull_request_number || github.run_id }}
  cancel-in-progress: false

jobs:
  deploy:
    if: github.event_name == 'workflow_run' && github.event.workflow_run.event == 'pull_request'
    runs-on: ubuntu-latest
    permissions:
      actions: read
      contents: read
      issues: write
      pull-requests: write
    steps:
      - name: Checkout trusted preview scripts
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          ref: ${{ github.event.repository.default_branch }}
          path: trusted-source
          persist-credentials: false

      - name: Resolve current pull request
        id: pull_request
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const { pathToFileURL } = require('node:url')
            const helperUrl = pathToFileURL(
              `${process.env.GITHUB_WORKSPACE}/trusted-source/.github/scripts/resolve-preview-pull-request.mjs`,
            ).href
            const { resolvePreviewPullRequest } = await import(helperUrl)
            const run = context.payload.workflow_run
            const resolution = await resolvePreviewPullRequest({
              github,
              owner: context.repo.owner,
              repo: context.repo.repo,
              run,
            })
            if (!resolution.number) {
              core.notice('No pull request is associated with this workflow run')
              core.setOutput('eligible', 'false')
              return
            }

            core.setOutput('number', String(resolution.number))
            core.setOutput('head_sha', resolution.headSha)
            core.setOutput('eligible', String(resolution.eligible))
            if (!resolution.eligible) {
              core.notice(`Skipping stale or ineligible preview run for PR #${resolution.number}`)
            }

      - name: Report failed preview build
        if: steps.pull_request.outputs.eligible == 'true' && github.event.workflow_run.conclusion != 'success'
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        env:
          PR_NUMBER: ${{ steps.pull_request.outputs.number }}
          RUN_URL: ${{ github.event.workflow_run.html_url }}
          RUN_CONCLUSION: ${{ github.event.workflow_run.conclusion }}
        with:
          script: |
            const { pathToFileURL } = require('node:url')
            const helperUrl = pathToFileURL(
              `${process.env.GITHUB_WORKSPACE}/trusted-source/.github/scripts/upsert-preview-comment.mjs`,
            ).href
            const { upsertPreviewComment } = await import(helperUrl)
            const content = `## Cloudflare PR preview

            The preview build **${process.env.RUN_CONCLUSION}**. No new deployment was published.

            [Open the failed workflow run](${process.env.RUN_URL}). Any URL from an earlier comment is stale.`
            await upsertPreviewComment({
              github,
              owner: context.repo.owner,
              repo: context.repo.repo,
              issueNumber: Number(process.env.PR_NUMBER),
              content,
            })

      - name: Download preview artifact
        if: steps.pull_request.outputs.eligible == 'true' && github.event.workflow_run.conclusion == 'success'
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: cloudflare-pages-preview
          path: preview-upload/site
          github-token: ${{ github.token }}
          run-id: ${{ github.event.workflow_run.id }}

      - name: Validate preview artifact
        if: steps.pull_request.outputs.eligible == 'true' && github.event.workflow_run.conclusion == 'success'
        run: node ./trusted-source/.github/scripts/validate-pages-preview.mjs ./preview-upload/site

      - name: Validate Cloudflare configuration
        if: steps.pull_request.outputs.eligible == 'true' && github.event.workflow_run.conclusion == 'success'
        env:
          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          CLOUDFLARE_PAGES_PROJECT: ${{ vars.CLOUDFLARE_PAGES_PROJECT }}
        run: node ./trusted-source/.github/scripts/validate-cloudflare-config.mjs

      - name: Deploy preview to Cloudflare Pages
        if: steps.pull_request.outputs.eligible == 'true' && github.event.workflow_run.conclusion == 'success'
        id: cloudflare
        uses: cloudflare/wrangler-action@9acf94ace14e7dc412b076f2c5c20b8ce93c79cd # v3
        with:
          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          workingDirectory: preview-upload
          packageManager: npm
          command: >-
            pages deploy site
            --project-name=${{ vars.CLOUDFLARE_PAGES_PROJECT }}
            --branch=pr-${{ steps.pull_request.outputs.number }}
            --commit-hash=${{ steps.pull_request.outputs.head_sha }}

      - name: Publish preview link
        if: steps.pull_request.outputs.eligible == 'true' && github.event.workflow_run.conclusion == 'success'
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        env:
          PR_NUMBER: ${{ steps.pull_request.outputs.number }}
          HEAD_SHA: ${{ steps.pull_request.outputs.head_sha }}
          PREVIEW_URL: ${{ steps.cloudflare.outputs.pages-deployment-alias-url }}
          IMMUTABLE_URL: ${{ steps.cloudflare.outputs.deployment-url }}
        with:
          script: |
            const { pathToFileURL } = require('node:url')
            const helperUrl = pathToFileURL(
              `${process.env.GITHUB_WORKSPACE}/trusted-source/.github/scripts/upsert-preview-comment.mjs`,
            ).href
            const { upsertPreviewComment } = await import(helperUrl)
            const previewUrl = process.env.PREVIEW_URL || process.env.IMMUTABLE_URL
            if (!previewUrl) throw new Error('Cloudflare did not return a preview URL')
            const content = `## Cloudflare PR preview

            [Open the latest preview](${previewUrl}) for commit \`${process.env.HEAD_SHA.slice(0, 12)}\`.

            Immutable deployment: ${process.env.IMMUTABLE_URL || previewUrl}

            > [!WARNING]
            > Pull request previews contain untrusted web and firmware code. Review the changes before granting WebSerial/Bluetooth permissions or flashing a device.`
            await upsertPreviewComment({
              github,
              owner: context.repo.owner,
              repo: context.repo.repo,
              issueNumber: Number(process.env.PR_NUMBER),
              content,
            })

  recover:
    name: Retry closed preview cleanup
    if: github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
      pull-requests: read
    steps:
      - name: Validate closed pull request
        id: pull_request
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        env:
          PR_NUMBER: ${{ inputs.pull_request_number }}
        with:
          script: |
            if (!/^[1-9]\d*$/.test(process.env.PR_NUMBER)) {
              throw new Error('pull_request_number must be a positive integer')
            }
            const number = Number(process.env.PR_NUMBER)
            if (!Number.isSafeInteger(number)) {
              throw new Error('pull_request_number exceeds the supported integer range')
            }
            const { data: pull } = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: number,
            })
            if (pull.state !== 'closed') {
              throw new Error(`Pull request #${number} must be closed before its preview can be cleaned up`)
            }
            core.setOutput('number', String(number))
      - name: Checkout trusted preview scripts
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          ref: ${{ github.event.repository.default_branch }}
          path: trusted-source
          persist-credentials: false
      - name: Validate Cloudflare configuration
        env:
          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          CLOUDFLARE_PAGES_PROJECT: ${{ vars.CLOUDFLARE_PAGES_PROJECT }}
        run: node ./trusted-source/.github/scripts/validate-cloudflare-config.mjs
      - name: Delete superseded preview deployments
        env:
          BRANCH_NAME: pr-${{ steps.pull_request.outputs.number }}
          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          CLOUDFLARE_PAGES_PROJECT: ${{ vars.CLOUDFLARE_PAGES_PROJECT }}
          KEEP_DEPLOYMENT_ID: ${{ inputs.keep_deployment_id }}
        run: node ./trusted-source/.github/scripts/delete-cloudflare-preview-deployments.mjs
      - name: Mark preview as closed
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        env:
          PREVIEW_URL: https://pr-${{ steps.pull_request.outputs.number }}.${{ vars.CLOUDFLARE_PAGES_PROJECT }}.pages.dev
          PR_NUMBER: ${{ steps.pull_request.outputs.number }}
        with:
          script: |
            const { pathToFileURL } = require('node:url')
            const helperUrl = pathToFileURL(
              `${process.env.GITHUB_WORKSPACE}/trusted-source/.github/scripts/upsert-preview-comment.mjs`,
            ).href
            const { upsertPreviewComment } = await import(helperUrl)
            const content = `## Cloudflare PR preview

            This pull request is closed. Its preview has been replaced with a closed page at ${process.env.PREVIEW_URL}.

            Superseded immutable preview deployments have been removed.`
            await upsertPreviewComment({
              github,
              owner: context.repo.owner,
              repo: context.repo.repo,
              issueNumber: Number(process.env.PR_NUMBER),
              content,
            })

  close:
    if: github.event_name == 'pull_request_target' && github.event.action == 'closed'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      issues: write
    steps:
      - name: Find preview comment
        id: preview
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const marker = '<!-- stackchan-cloudflare-preview -->'
            const comments = await github.paginate(github.rest.issues.listComments, {
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
            })
            const exists = comments.some(
              (comment) => comment.user?.login === 'github-actions[bot]' && comment.body?.includes(marker),
            )
            core.setOutput('exists', String(exists))
      - name: Checkout trusted preview scripts
        if: steps.preview.outputs.exists == 'true'
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          ref: ${{ github.event.repository.default_branch }}
          path: trusted-source
          persist-credentials: false
      - name: Validate Cloudflare configuration
        if: steps.preview.outputs.exists == 'true'
        env:
          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          CLOUDFLARE_PAGES_PROJECT: ${{ vars.CLOUDFLARE_PAGES_PROJECT }}
        run: node ./trusted-source/.github/scripts/validate-cloudflare-config.mjs
      - name: Create closed preview page
        if: steps.preview.outputs.exists == 'true'
        env:
          PR_NUMBER: ${{ github.event.pull_request.number }}
        run: |
          mkdir -p closed-upload/site
          printf '%s\n' \
            '<!doctype html>' \
            '<html lang="en"><head><meta charset="utf-8"><meta name="robots" content="noindex">' \
            '<meta name="viewport" content="width=device-width,initial-scale=1">' \
            "<title>PR #${PR_NUMBER} preview closed</title></head>" \
            "<body><main><h1>PR #${PR_NUMBER} preview closed</h1>" \
            '<p>This pull request is closed, so its preview is no longer available.</p></main></body></html>' \
            > closed-upload/site/index.html
      - name: Replace preview with closed page
        if: steps.preview.outputs.exists == 'true'
        id: cloudflare
        uses: cloudflare/wrangler-action@9acf94ace14e7dc412b076f2c5c20b8ce93c79cd # v3
        with:
          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          workingDirectory: closed-upload
          packageManager: npm
          command: >-
            pages deploy site
            --project-name=${{ vars.CLOUDFLARE_PAGES_PROJECT }}
            --branch=pr-${{ github.event.pull_request.number }}
            --commit-hash=${{ github.event.pull_request.head.sha }}
      - name: Delete superseded preview deployments
        if: steps.preview.outputs.exists == 'true'
        env:
          BRANCH_NAME: pr-${{ github.event.pull_request.number }}
          CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
          CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }}
          CLOUDFLARE_PAGES_PROJECT: ${{ vars.CLOUDFLARE_PAGES_PROJECT }}
          KEEP_DEPLOYMENT_ID: ${{ steps.cloudflare.outputs.pages-deployment-id }}
        run: node ./trusted-source/.github/scripts/delete-cloudflare-preview-deployments.mjs
      - name: Mark preview as closed
        if: always() && steps.preview.outputs.exists == 'true' && steps.cloudflare.outcome == 'success'
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        env:
          PR_NUMBER: ${{ github.event.pull_request.number }}
          PREVIEW_URL: ${{ steps.cloudflare.outputs.pages-deployment-alias-url }}
        with:
          script: |
            const { pathToFileURL } = require('node:url')
            const helperUrl = pathToFileURL(
              `${process.env.GITHUB_WORKSPACE}/trusted-source/.github/scripts/upsert-preview-comment.mjs`,
            ).href
            const { upsertPreviewComment } = await import(helperUrl)
            const content = `## Cloudflare PR preview

            This pull request is closed. Its preview has been replaced with a closed page${process.env.PREVIEW_URL ? ` at ${process.env.PREVIEW_URL}` : ''}.`
            await upsertPreviewComment({
              github,
              owner: context.repo.owner,
              repo: context.repo.repo,
              issueNumber: Number(process.env.PR_NUMBER),
              content,
            })