actions/go-version-detect/action.yml

# yaml-language-server: $schema=https://json.schemastore.org/github-action.json
# permissions:
#   - contents: read  # Required for reading version files
---
name: Go Version Detect
description: "Detects the Go version from the project's go.mod file or defaults to a specified version."
author: 'Ismo Vuorinen'

branding:
  icon: code
  color: blue

inputs:
  default-version:
    description: 'Default Go version to use if go.mod is not found.'
    required: false
    default: '1.25'
  token:
    description: 'GitHub token for authentication'
    required: false
    default: ''

outputs:
  go-version:
    description: 'Detected or default Go version.'
    value: ${{ steps.parse-version.outputs.detected-version }}

runs:
  using: composite
  steps:
    - name: Validate Inputs
      id: validate
      shell: sh
      env:
        DEFAULT_VERSION: ${{ inputs.default-version }}
      run: |
        set -eu

        # Validate default-version format
        if ! echo "$DEFAULT_VERSION" | grep -Eq '^[0-9]+\.[0-9]+(\.[0-9]+)?$'; then
          echo "::error::Invalid default-version format: '$DEFAULT_VERSION'. Expected format: X.Y or X.Y.Z (e.g., 1.22, 1.21.5)"
          exit 1
        fi

        # Check for reasonable version range (prevent malicious inputs)
        major_version=$(echo "$DEFAULT_VERSION" | cut -d'.' -f1)
        if [ "$major_version" -ne 1 ]; then
          echo "::error::Invalid default-version: '$DEFAULT_VERSION'. Go major version should be 1"
          exit 1
        fi

        # Check minor version range
        minor_version=$(echo "$DEFAULT_VERSION" | cut -d'.' -f2)
        if [ "$minor_version" -lt 16 ] || [ "$minor_version" -gt 30 ]; then
          echo "::error::Invalid default-version: '$DEFAULT_VERSION'. Go minor version should be between 16 and 30"
          exit 1
        fi

        echo "Input validation completed successfully"

    - name: Checkout Repository
      uses: actions/checkout@71cf2267d89c5cb81562390fa70a37fa40b1305e # v6-beta
      with:
        token: ${{ inputs.token || github.token }}

    - name: Parse Go Version
      id: parse-version
      uses: ivuorinen/actions/version-file-parser@0fa9a68f07a1260b321f814202658a6089a43d42
      with:
        language: 'go'
        tool-versions-key: 'golang'
        dockerfile-image: 'golang'
        version-file: '.go-version'
        validation-regex: '^[0-9]+\.[0-9]+(\.[0-9]+)?$'
        default-version: ${{ inputs.default-version }}