.github/workflows/take.yml

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name: Assign/unassign the issue via `take` or `untake` comment
on:
  issue_comment:
    types: created

permissions:
  issues: write

jobs:
  issue_assign:
    runs-on: ubuntu-slim
    if: (!github.event.issue.pull_request) && (github.event.comment.body == 'take' || github.event.comment.body == 'untake')
    concurrency:
      group: ${{ github.actor }}-issue-assign
    steps:
      - name: Take or untake issue
        env:
          COMMENT_BODY: ${{ github.event.comment.body }}
          ISSUE_NUMBER: ${{ github.event.issue.number }}
          USER_LOGIN: ${{ github.event.comment.user.login }}
          REPO: ${{ github.repository }}
          TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          if [ "$COMMENT_BODY" == "take" ]
          then
            CODE=$(curl -H "Authorization: token $TOKEN" -LI https://api.github.com/repos/$REPO/issues/$ISSUE_NUMBER/assignees/$USER_LOGIN -o /dev/null -w '%{http_code}\n' -s)
            if [ "$CODE" -eq "204" ]
            then
              echo "Assigning issue $ISSUE_NUMBER to $USER_LOGIN"
              curl -X POST -H "Authorization: token $TOKEN" -H "Content-Type: application/json" -d "{\"assignees\": [\"$USER_LOGIN\"]}" https://api.github.com/repos/$REPO/issues/$ISSUE_NUMBER/assignees
            else
              echo "Cannot assign issue $ISSUE_NUMBER to $USER_LOGIN"
            fi
          elif [ "$COMMENT_BODY" == "untake" ]
          then
            echo "Unassigning issue $ISSUE_NUMBER from $USER_LOGIN"
            curl -X DELETE -H "Authorization: token $TOKEN" -H "Content-Type: application/json" -d "{\"assignees\": [\"$USER_LOGIN\"]}" https://api.github.com/repos/$REPO/issues/$ISSUE_NUMBER/assignees
          fi