action.yml

name: Labeler
description: A GitHub action to manage PR/issue labels
inputs:
  token:
    description: Token with pull requests/issues write permissions
    required: true
    default: ${{ github.token }}
  repository:
    description: Repository name in `owner/repo` format
    required: true
    default: ${{ github.repository }}
  issue:
    description: Issue or pull request number
    required: true
  label:
    description: Label name
    required: true
  action:
    description: |
      Action which should be performed with given label.
      Options: `add`, `remove`
    required: true
  suppress:
    description: Whether to suppress errors for failed requests or not.
    required: true
    default: 'false'

runs:
  using: composite
  steps:
    - name: Validate inputs
      shell: python
      run: |
        action_opts = ["remove", "add"]
        action = "${{ inputs.action }}"
        if action not in action_opts:
            raise ValueError(f"Action has to be one of {action_opts}.")

    - name: Remove label `${{ inputs.label }}` from issue ${{ inputs.issue }}
      if: ${{ inputs.action == 'remove' }}
      shell: python
      run: |
        from urllib.request import Request, urlopen
        import sys
        url = "https://api.github.com/repos/${{ inputs.repository }}/issues/${{ inputs.issue }}/labels/${{ inputs.label }}"
        response = urlopen(Request(url, method="DELETE", headers={"Authorization": "token ${{ inputs.token }}"}))
        if response.code == 200:
          print("Label removed")
        else:
            if "${{ inputs.suppress }}" == "false":
                print(f"::error::{response.code}: Error removing label.")
                sys.exit(1)
            print(f"::warning::{response.code}: Error removing label.")

    - name: Add label `${{ inputs.label }}` to issue ${{ inputs.issue }}
      if: ${{ inputs.action == 'add' }}
      shell: python
      run: |
        from urllib.request import Request, urlopen
        import sys
        import json
        url = "https://api.github.com/repos/${{ inputs.repository }}/issues/${{ inputs.issue }}/labels"
        body = {"labels": ["${{ inputs.label }}"]}
        data = bytes(json.dumps(body), encoding="utf-8")
        response = urlopen(Request(url, method="POST", headers={"Authorization": "token ${{ inputs.token }}"}, data=data))
        if response.code == 200:
          print("Label added")
        else:
          if "${{ inputs.suppress }}" == "false":
            print(f"::error::{response.code}: Error adding label.")
            sys.exit(1)
          print(f"::warning::{response.code}: Error adding label.")