action.yml

name: 'MS Teams Notification Action'
description: 'Send a notification to Microsoft Teams when a pull request is opened or reopened'
inputs:
  webhook_url:
    description: 'Microsoft Teams webhook URL'
    required: true
  pr_title:
    description: 'Pull Request title'
    required: true
  pr_url:
    description: 'Pull Request URL'
    required: true
  pr_creator:
    description: 'Pull Request creator'
    required: true
  repo_name:
    description: 'Repository name'
    required: true
  theme_color:
    description: 'Theme color for the Teams message card'
    required: false
    default: '0076D7'
  custom_title:
    description: 'Custom title for the Teams message card'
    required: false
    default: ''
  activity_image:
    description: 'Custom activity image URL'
    required: false
    default: 'https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png'
runs:
  using: 'composite'
  steps:
    - name: Send Teams Notification
      shell: bash
      env:
        TEAMS_WEBHOOK_URL: ${{ inputs.webhook_url }}
        PR_URL: ${{ inputs.pr_url }}
        PR_TITLE: ${{ inputs.pr_title }}
        PR_CREATOR: ${{ inputs.pr_creator }}
        REPO_NAME: ${{ inputs.repo_name }}
        THEME_COLOR: ${{ inputs.theme_color }}
        CUSTOM_TITLE: ${{ inputs.custom_title }}
        ACTIVITY_IMAGE: ${{ inputs.activity_image }}
      run: |
        # Function to check if a variable is empty
        is_empty() {
          local var_name="$1"
          local var_value="${!var_name}"
          if [ -z "$var_value" ]; then
            echo "Error: $var_name is required but not set."
            return 0
          fi
          return 1
        }

        # Check all required inputs
        required_inputs=("TEAMS_WEBHOOK_URL" "PR_URL" "PR_TITLE" "PR_CREATOR" "REPO_NAME")
        error_occurred=false

        for input in "${required_inputs[@]}"; do
          if is_empty "$input"; then
            error_occurred=true
          fi
        done

        if [ "$error_occurred" = true ]; then
          echo "One or more required inputs are missing. Please check the action configuration."
          exit 1
        fi

        # Set default values for optional inputs
        TITLE="${CUSTOM_TITLE:-$PR_TITLE}"
        THEME="${THEME_COLOR:-0076D7}"
        IMAGE="${ACTIVITY_IMAGE:-https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png}"

        # Escape special characters in variables
        escape_string() {
          echo "$1" | sed 's/\\/\\\\/g; s/"/\\"/g; s/`/\\`/g; s/\$/\\$/g'
        }

        TITLE_ESCAPED=$(escape_string "$TITLE")
        PR_CREATOR_ESCAPED=$(escape_string "$PR_CREATOR")
        REPO_NAME_ESCAPED=$(escape_string "$REPO_NAME")
        PR_URL_ESCAPED=$(escape_string "$PR_URL")

        # Send the notification
        curl -H "Content-Type: application/json" -d '{
          "@type": "MessageCard",
          "@context": "http://schema.org/extensions",
          "themeColor": "'"$THEME"'",
          "summary": "New PR: '"$TITLE_ESCAPED"'",
          "sections": [{
            "activityTitle": "New Pull Request in '"$REPO_NAME_ESCAPED"'",
            "activitySubtitle": "Created by '"$PR_CREATOR_ESCAPED"'",
            "activityImage": "'"$IMAGE"'",
            "facts": [{
              "name": "Title",
              "value": "'"$TITLE_ESCAPED"'"
            }, {
              "name": "Creator",
              "value": "'"$PR_CREATOR_ESCAPED"'"
            }, {
              "name": "Repository",
              "value": "'"$REPO_NAME_ESCAPED"'"
            }],
            "markdown": true
          }],
          "potentialAction": [{
            "@type": "OpenUri",
            "name": "View Pull Request",
            "targets": [{
              "os": "default",
              "uri": "'"$PR_URL_ESCAPED"'"
            }]
          }]
        }' "$TEAMS_WEBHOOK_URL"

        if [ $? -ne 0 ]; then
          echo "Failed to send notification to Microsoft Teams."
          exit 1
        else
          echo "Notification sent successfully to Microsoft Teams."
        fi