configure-pr.yml

# This workflow labels PRs based on the files that were changed and also assign a reviewer based on team. It uses a custom script to this
# instead of actions/labeler as few of the tags are more than just file changes.

name: Configure PR
on:
  pull_request_target:
    types: [opened, synchronize, reopened, ready_for_review]

jobs:
  configure-pr:
    runs-on: ubuntu-22.04
    permissions:
      contents: read
      pull-requests: write
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          persist-credentials: false
      - name: Compute Labels
        id: compute-labels
        uses: actions/github-script@v7
        with:
          # Required for the script to access team membership information.
          # Scope: members:read and contentes:read permission on the organization.
          github-token: ${{ secrets.GH_PAT_MEMBER_AND_PULL_REQUEST_READONLY }}
          script: |
            const script = require('./scripts/github-action/compute-labels.js')
            await script({github, context, core})
      # Separating apply labels to separate step to avoid using PAT token auth.
      - name: Apply Labels
        uses: actions/github-script@v7
        env:
          labelsToAdd: '${{ steps.compute-labels.outputs.add }}'
          labelsToRemove: '${{ steps.compute-labels.outputs.remove }}'
        with:
          script: |
            const { labelsToAdd, labelsToRemove, DRY_RUN } = process.env
            if(Boolean(DRY_RUN)){
              core.info(`Would have added labels: ${labelsToAdd}`)
              core.info(`Would have removed labels: ${labelsToRemove}`)
              return
            }
            if(labelsToAdd.length > 0) {
              await github.rest.issues.addLabels({
                issue_number: context.payload.pull_request.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                labels: labelsToAdd.split(',')
              });
            }
            if(labelsToRemove.length > 0) {
              const requests = labelsToRemove.split(',').map(label => {
                return github.rest.issues.removeLabel({
                  issue_number: context.payload.pull_request.number,
                  name: label,
                  owner: context.repo.owner,
                  repo: context.repo.repo
                });
              });
              await Promise.all(requests);
            }

      - name: Comment for mapping-kit changes
        uses: actions/github-script@v7
        env:
          labelsToAdd: '${{ steps.compute-labels.outputs.add }}'
          labelsToRemove: '${{ steps.compute-labels.outputs.remove }}'
        with:
          script: |
            const { labelsToAdd, labelsToRemove, DRY_RUN } = process.env
            const shouldAddComment = labelsToAdd.length > 0 && labelsToAdd.split(",").some(x=>x.includes("mappingkit"))
            const shouldRemoveComment = labelsToRemove.length > 0 && labelsToRemove.split(",").some(x=>x.includes("mappingkit"))
            // Get the list of comments on the PR
            const response = await github.rest.issues.listComments({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo
            })
            const mappingKitComment = response.data.find(comment => comment.body.includes('mapping-kit go'))
            if(shouldAddComment){
                if (mappingKitComment) {
                  console.log('Already commented on this PR')
                  return
                }
                // Add comment to the PR
                await github.rest.issues.createComment({
                    issue_number: context.issue.number,
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    body: `This PR makes changes to mapping-kit. Please ensure that the changes are reflected in the [mapping-kit go](https://github.com/segmentio/mapping-kit) library as well and link the PR in description.`
                  })
            }
            if(shouldRemoveComment) {
              if (!mappingKitComment) {
                console.log('No mapping-kit comment to remove')
                return
              }
              // Remove comment from the PR
              await github.rest.issues.deleteComment({
                  comment_id: mappingKitComment.id,
                  owner: context.repo.owner,
                  repo: context.repo.repo
                })
            }

      - name: Get Reviewers
        if: github.event.action == 'ready_for_review' || (github.event.action == 'opened' && !github.event.pull_request.draft)
        id: get-reviewers
        uses: actions/github-script@v7
        env:
          labelsToAdd: '${{ steps.compute-labels.outputs.add }}'
        with:
          github-token: ${{ secrets.GH_PAT_MEMBER_AND_PULL_REQUEST_READONLY }}
          script: |
            const script = require('./scripts/github-action/get-reviewers.js')
            await script({github, context, core})

      - name: Assign Reviewers
        if: (github.event.action == 'ready_for_review' || (github.event.action == 'opened' && !github.event.pull_request.draft)) && steps.get-reviewers.outputs.skip != 'true'
        uses: actions/github-script@v7
        env:
          REVIEWERS: '${{ steps.get-reviewers.outputs.reviewers }}'
          TEAM: '${{ steps.get-reviewers.outputs.team }}'
        with:
          script: |
            const script = require('./scripts/github-action/assign-reviewer.js')
            await script({github, context, core})

      - name: Log Skip Reviewer Assignment Reason
        if: (github.event.action == 'ready_for_review' || (github.event.action == 'opened' && !github.event.pull_request.draft)) && steps.get-reviewers.outputs.skip == 'true'
        run: echo "Skipping reviewer assignment - ${{ steps.get-reviewers.outputs.reason }}"