action.yml

name: contributor-takes-action
description: This is an action to assign yourself to an issue for a repo you are not a contributor to.
author: Brian Douglas
branding:
  icon: 'thumbs-up'
  color: 'white'

inputs:
  message:
    description: 'Message to prospective contributor'
    required: false
    default: ''
  issueCurrentlyAssignedMessage:
    description: 'Message to contributors if issue is already assigned'
    required: false
    default: 'The issue you are trying to assign to yourself is already assigned.'

  blockingLabels:
    description: 'Optional labels that are on an issue that block an issue from being assigned by the trigger.'
    required: false
    default: ''

  blockingLabelsMessage:
    description: 'Message to contributors if issue is blocked by a label'
    required: false
    default: 'The issue you are trying to assign to yourself is blocked by a one or more labels on the issue.'

  trigger:
    description: 'The string that triggers the action'
    required: false
    default: '.take'
  token:
    description: 'The GitHub PAT used to authenticate when updating the Issue'
    required: true

runs:
  using: "composite"
  steps:
    - run: |
        BODY="$(jq '.comment.body' $GITHUB_EVENT_PATH)"
        ISSUE_NUMBER="$(jq '.issue.number' $GITHUB_EVENT_PATH)"
        LOGIN="$(jq '.comment.user.login' $GITHUB_EVENT_PATH | tr -d \")"
        REPO="$(jq '.repository.full_name' $GITHUB_EVENT_PATH | tr -d \")"
        ISSUE_JSON="$(jq '.issue' $GITHUB_EVENT_PATH)"
        ISSUE_LABELS="$(jq -r '.issue.labels[].name' $GITHUB_EVENT_PATH)"
        ISSUE_LABELS=$(echo "$ISSUE_LABELS" | jq -n --arg str "$ISSUE_LABELS" '$str | split("\n")')
        ISSUE_CURRENTLY_ASSIGNED=`echo $ISSUE_JSON | jq '.assignees | length == 0'`

        if [[ $BODY == *"$INPUT_TRIGGER"* ]]; then
          if [[ "$ISSUE_CURRENTLY_ASSIGNED" == true ]]; then
            BLOCKING_LABELS=$(echo "$RAW_BLOCKING_LABELS" | jq -n --arg str "$RAW_BLOCKING_LABELS" '$str | split(",")')

            echo "Issue labels: $ISSUE_LABELS"
            echo "Blocking labels: $BLOCKING_LABELS"

            # See if at least one label on the issue is in the list of blocking labels
            blocking_label_found=$(jq -n --argjson ISSUE_LABELS "$ISSUE_LABELS" --argjson BLOCKING_LABELS "$BLOCKING_LABELS" '$ISSUE_LABELS as $il | $BLOCKING_LABELS as $bl | any($il[]; . as $i | any($bl[]; . == $i))')

            echo "blocking label found: $blocking_label_found"

            if [ "$blocking_label_found" == true ]; then
              echo "Issue contains one or more blocking labels: $BLOCKING_LABELS"
              echo "Unable to assign issue $ISSUE_NUMBER to $LOGIN"

              # Post a comment on the issue that there are blocking labels on the issue preventing it from being assigned
              if [[ ! -z $BLOCKING_LABELS_MESSAGE ]]; then
                jq -n -r --arg body "$BLOCKING_LABELS_MESSAGE" '{body: $body}' > payload.json
                curl -X POST -H "Authorization: bearer $GITHUB_PAT" --data @payload.json https://api.github.com/repos/$REPO/issues/$ISSUE_NUMBER/comments
              fi
            else
              # Assign the issue to the user
              echo "Is issue currently assigned: $ISSUE_CURRENTLY_ASSIGNED"
              echo "Assigning issue $ISSUE_NUMBER to $LOGIN"
              echo "Using the link: https://api.github.com/repos/$REPO/issues/$ISSUE_NUMBER/assignees"
              curl -H "Authorization: bearer $GITHUB_PAT" -d '{"assignees":["'"$LOGIN"'"]}' https://api.github.com/repos/$REPO/issues/$ISSUE_NUMBER/assignees
              if [[ ! -z $INPUT_MESSAGE ]]; then
                jq -n -r --arg body "$INPUT_MESSAGE" '{body: $body}' > payload.json
                curl -X POST -H "Authorization: bearer $GITHUB_PAT" --data @payload.json https://api.github.com/repos/$REPO/issues/$ISSUE_NUMBER/comments
              fi
            fi
          else
            echo "This issue is currently assigned to a different user"
            if [[ ! -z $ISSUE_CURRENTLY_ASSIGNED_MESSAGE ]]; then
            jq -n -r --arg body "$ISSUE_CURRENTLY_ASSIGNED_MESSAGE" '{body: $body}' > payload.json
            curl -X POST -H "Authorization: bearer $GITHUB_PAT" --data @payload.json https://api.github.com/repos/$REPO/issues/$ISSUE_NUMBER/comments
            fi
          fi
        fi
      shell: bash
      env:
        INPUT_MESSAGE: "${{ inputs.message }}"
        RAW_BLOCKING_LABELS: "${{ inputs.blockingLabels }}"
        BLOCKING_LABELS_MESSAGE: "${{ inputs.blockingLabelsMessage }}"
        INPUT_TRIGGER: "${{ inputs.trigger }}"
        ISSUE_CURRENTLY_ASSIGNED_MESSAGE: "${{ inputs.issueCurrentlyAssignedMessage }}"
        GITHUB_PAT: "${{ inputs.token }}"