actions/csharp-lint-check/action.yml

# yaml-language-server: $schema=https://json.schemastore.org/github-action.json
# permissions:
#   - contents: read          # Required for checking out repository
#   - security-events: write  # Required for uploading SARIF results
---
name: 'C# Lint Check'
description: 'Runs linters like StyleCop or dotnet-format for C# code style checks.'
author: 'Ismo Vuorinen'

branding:
  icon: 'code'
  color: 'blue'

inputs:
  dotnet-version:
    description: 'Version of .NET SDK to use.'
    required: false
  token:
    description: 'GitHub token for authentication'
    required: false
    default: ''

outputs:
  lint_status:
    description: 'Overall lint status (success/failure)'
    value: ${{ steps.dotnet-format.outcome == 'success' && 'success' || 'failure' }}
  errors_count:
    description: 'Number of formatting errors found'
    value: ${{ steps.dotnet-format.outputs.errors_count || '0' }}
  warnings_count:
    description: 'Number of formatting warnings found'
    value: ${{ steps.dotnet-format.outputs.warnings_count || '0' }}

runs:
  using: composite
  steps:
    - name: Validate Inputs
      id: validate
      shell: bash
      env:
        DOTNET_VERSION: ${{ inputs.dotnet-version }}
      run: |
        set -euo pipefail

        # Validate .NET version format if provided
        if [[ -n "$DOTNET_VERSION" ]]; then
          if ! [[ "$DOTNET_VERSION" =~ ^[0-9]+(\.[0-9]+(\.[0-9]+)?)?$ ]]; then
            echo "::error::Invalid dotnet-version format: '$DOTNET_VERSION'. Expected format: X.Y or X.Y.Z (e.g., 7.0, 8.0.100)"
            exit 1
          fi

          # Check for reasonable version range (prevent malicious inputs)
          major_version=$(echo "$DOTNET_VERSION" | cut -d'.' -f1)
          if [ "$major_version" -lt 3 ] || [ "$major_version" -gt 20 ]; then
            echo "::error::Invalid dotnet-version: '$DOTNET_VERSION'. Major version should be between 3 and 20"
            exit 1
          fi
        fi

        echo "Input validation completed successfully"

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

    - name: Detect .NET SDK Version
      id: detect-dotnet-version
      shell: sh
      env:
        DEFAULT_VERSION: "${{ inputs.dotnet-version || '7.0' }}"
      run: |
        set -eu

        # Function to validate version format
        validate_version() {
          version=$1
          case "$version" in
            [0-9]* | [0-9]*.[0-9]* | [0-9]*.[0-9]*.[0-9]*)
              return 0
              ;;
            *)
              return 1
              ;;
          esac
        }

        # Function to clean version string
        clean_version() {
          printf '%s' "$1" | sed 's/^[vV]//' | tr -d ' \n\r'
        }

        detected_version=""

        # Parse .tool-versions file
        if [ -f .tool-versions ]; then
          echo "Checking .tool-versions for dotnet..." >&2
          version=$(awk '/^dotnet[[:space:]]/ {gsub(/#.*/, ""); print $2; exit}' .tool-versions 2>/dev/null || echo "")
          if [ -n "$version" ]; then
            version=$(clean_version "$version")
            if validate_version "$version"; then
              echo "Found .NET version in .tool-versions: $version" >&2
              detected_version="$version"
            fi
          fi
        fi

        # Parse Dockerfile
        if [ -z "$detected_version" ] && [ -f Dockerfile ]; then
          echo "Checking Dockerfile for dotnet..." >&2
          version=$(grep -iF "FROM" Dockerfile | grep -F "dotnet:" | head -1 | \
            sed -n -E "s/.*dotnet:([0-9]+(\.[0-9]+)*)(-[^:]*)?.*/\1/p" || echo "")
          if [ -n "$version" ]; then
            version=$(clean_version "$version")
            if validate_version "$version"; then
              echo "Found .NET version in Dockerfile: $version" >&2
              detected_version="$version"
            fi
          fi
        fi

        # Parse devcontainer.json
        if [ -z "$detected_version" ] && [ -f .devcontainer/devcontainer.json ]; then
          echo "Checking devcontainer.json for dotnet..." >&2
          if command -v jq >/dev/null 2>&1; then
            version=$(jq -r '.image // empty' .devcontainer/devcontainer.json 2>/dev/null | sed -n -E "s/.*dotnet:([0-9]+(\.[0-9]+)*)(-[^:]*)?.*/\1/p" || echo "")
            if [ -n "$version" ]; then
              version=$(clean_version "$version")
              if validate_version "$version"; then
                echo "Found .NET version in devcontainer: $version" >&2
                detected_version="$version"
              fi
            fi
          else
            echo "jq not found; skipping devcontainer.json parsing" >&2
          fi
        fi

        # Parse global.json
        if [ -z "$detected_version" ] && [ -f global.json ]; then
          echo "Checking global.json..." >&2
          if command -v jq >/dev/null 2>&1; then
            version=$(jq -r '.sdk.version // empty' global.json 2>/dev/null || echo "")
            if [ -n "$version" ]; then
              version=$(clean_version "$version")
              if validate_version "$version"; then
                echo "Found .NET version in global.json: $version" >&2
                detected_version="$version"
              fi
            fi
          else
            echo "jq not found; skipping global.json parsing" >&2
          fi
        fi

        # Use default version if nothing detected
        if [ -z "$detected_version" ]; then
          detected_version="$DEFAULT_VERSION"
          echo "Using default .NET version: $detected_version" >&2
        fi

        # Set output
        printf 'detected-version=%s\n' "$detected_version" >> "$GITHUB_OUTPUT"
        echo "Final detected .NET version: $detected_version" >&2

    - name: Setup .NET SDK
      uses: actions/setup-dotnet@d4c94342e560b34958eacfc5d055d21461ed1c5d # v5.0.0
      with:
        dotnet-version: ${{ steps.detect-dotnet-version.outputs.detected-version }}

    - name: Install dotnet-format
      shell: bash
      run: |
        set -euo pipefail

        dotnet tool install --global dotnet-format --version 7.0.1

    - name: Run dotnet-format
      id: dotnet-format
      shell: bash
      run: |
        set -euo pipefail

        # Initialize counters
        errors_count=0
        warnings_count=0

        if ! dotnet format --check --report sarif --report-file dotnet-format.sarif; then
          # Parse SARIF file to count errors and warnings if it exists
          if [ -f "dotnet-format.sarif" ]; then
            if command -v jq >/dev/null 2>&1; then
              errors_count=$(jq '[.runs[].results[]? | select(.level == "error" or (.level // "error") == "error")] | length' dotnet-format.sarif 2>/dev/null || echo "0")
              warnings_count=$(jq '[.runs[].results[]? | select(.level == "warning")] | length' dotnet-format.sarif 2>/dev/null || echo "0")
            fi
          fi

          echo "errors_count=$errors_count" >> $GITHUB_OUTPUT
          echo "warnings_count=$warnings_count" >> $GITHUB_OUTPUT
          echo "::error::Code formatting issues found. Check the SARIF report for details."
          exit 1
        else
          echo "errors_count=0" >> $GITHUB_OUTPUT
          echo "warnings_count=0" >> $GITHUB_OUTPUT
        fi

    - name: Upload SARIF Report
      uses: github/codeql-action/upload-sarif@014f16e7ab1402f30e7c3329d33797e7948572db # v4.31.3
      with:
        sarif_file: dotnet-format.sarif