name: Tests

# This file implements the protection strategy laid out in
# go/protobuf-gha-protected-resources.  Pull requests from branches within this
# repository are considered safe and will immediately start running tests on
# every commit.  Pull requests from forked repositories are unsafe, and leave
# us vulnerable to PWN requests and stolen resources.  In these cases, we
# require a special "safe for tests" tag to be added to the pull request before
# we start testing.  This will be immediately removed, so that further commits
# require their own stamp to test.

on:
  # continuous
  schedule:
    # Run every hour
    - cron: "0 * * * *"

  # postsubmit
  push:
    branches:
      - main
      - '[0-9]+.x'
      # The 21.x and 22.x branches still use Kokoro
      - '!2[12].x'
      # For testing purposes so we can stage this on the `gha` branch.
      - gha

  # safe presubmit
  pull_request:
    branches:
      - main
      - '[0-9]+.x'
      # The 21.x and 22.x branches still use Kokoro
      - '!2[12].x'
      # For testing purposes so we can stage this on the `gha` branch.
      - gha

  # unsafe presubmit
  pull_request_target:
    branches:
      - main
      - '[0-9]+.x'
      # The 21.x branch still use Kokoro
      - '!21.x'
      # For testing purposes so we can stage this on the `gha` branch.
      - gha
    types: [labeled, opened, reopened, synchronize]

  # manual
  workflow_dispatch:
  
permissions:
  contents: read

jobs:
  check-tag:
    name: Check for Safety

    # Avoid running tests twice on PR updates.  If the PR is coming from our
    # repository, it's safe and we can use `pull_request`.  Otherwise, we should
    # use `pull_request_target`.
    if: |
      (github.event_name != 'pull_request' &&
       github.event_name != 'pull_request_target' &&
       github.event.repository.full_name == 'protocolbuffers/protobuf') ||
      (github.event_name == 'pull_request' &&
       github.event.pull_request.head.repo.full_name == 'protocolbuffers/protobuf') ||
      (github.event_name == 'pull_request_target' &&
       github.event.pull_request.head.repo.full_name != 'protocolbuffers/protobuf')

    runs-on: ubuntu-latest
    outputs:
      # Store the sha for checkout so we can easily use it later.  For safe
      # events, this will be blank and use the defaults.
      checkout-sha: ${{ steps.safe-checkout.outputs.sha }}
    steps:
      - name: Check
        # Trivially pass for safe PRs, and explicitly error for unsafe ones
        # unless this is specifically an event for adding the safe label.
        run: >
          ${{ github.event_name != 'pull_request_target' || github.event.label.name == ':a: safe for tests' }} ||
          (echo "This pull request is from an unsafe fork and hasn't been approved to run tests." &&
           echo "A protobuf team member will need to review the PR and add the 'safe for tests' tag." &&
           exit 1)

      - name: Cache safe commit
        id: safe-checkout
        run: >
          ${{ github.event_name != 'pull_request_target' }} ||
          echo "sha=${{ github.event.pull_request.head.sha  }}"  >> $GITHUB_OUTPUT

  remove-tag:
    name: Remove safety tag
    needs: [check-tag]
    if: github.event.action == 'labeled'
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - uses: actions-ecosystem/action-remove-labels@2ce5d41b4b6aa8503e285553f75ed56e0a40bae0 # v1.3.0
        with:
          fail_on_error: true
          labels: ':a: safe for tests'

  # Note: this pattern of passing the head sha is vulnerable to PWN requests for
  # pull_request_target events. We carefully limit those workflows to require a
  # human stamp before continuing.
  cpp:
    name: C++
    needs: [check-tag]
    uses: ./.github/workflows/test_cpp.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  java:
    name: Java
    needs: [check-tag]
    uses: ./.github/workflows/test_java.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  python:
    name: Python
    needs: [check-tag]
    uses: ./.github/workflows/test_python.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  ruby:
    name: Ruby
    needs: [check-tag]
    uses: ./.github/workflows/test_ruby.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  php:
    name: PHP
    needs: [check-tag]
    uses: ./.github/workflows/test_php.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  php-ext:
    name: PHP Extension
    needs: [check-tag]
    uses: ./.github/workflows/test_php_ext.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  csharp:
    name: C#
    needs: [check-tag]
    uses: ./.github/workflows/test_csharp.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  objectivec:
    name: Objective-C
    needs: [check-tag]
    uses: ./.github/workflows/test_objectivec.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  rust:
    name: Rust
    needs: [check-tag]
    uses: ./.github/workflows/test_rust.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  upb:
    name: μpb
    needs: [check-tag]
    uses: ./.github/workflows/test_upb.yml
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit

  staleness:
    name: Staleness
    needs: [check-tag]
    uses: ./.github/workflows/staleness_check.yml
    # Staleness tests have scheduled runs during off-hours to avoid race conditions.
    if: ${{ github.event_name != 'schedule' }}
    with:
      safe-checkout: ${{ needs.check-tag.outputs.checkout-sha }}
    secrets: inherit