name: 'TruffleHog OSS'
description: 'Scan Github Actions with TruffleHog.'
author: Truffle Security Co. <support@trufflesec.com>

inputs:
  path:
    description: Repository path
    required: false
    default: "./"
  base:
    description: Start scanning from here (usually main branch).
    required: false
    default: ''
  head:
    description: Scan commits until here (usually dev branch).
    required: false
  extra_args:
    default: ''
    description: Extra args to be passed to the trufflehog cli.
    required: false
  version:
    default: 'latest'
    description: Scan with this trufflehog cli version.
    required: false
branding:
  icon: "shield"
  color: "green"

runs:
  using: "composite"
  steps:
  - shell: bash
    working-directory: ${{ inputs.path }}
    env:
      BASE: ${{ inputs.base }}
      HEAD: ${{ inputs.head }}
      ARGS: ${{ inputs.extra_args }}
      COMMITS: ${{ toJson(github.event.commits) }}
      VERSION: ${{ inputs.version }}
    run: |
      ##########################################
      ## ADVANCED USAGE                       ##
      ## Scan by BASE & HEAD user inputs      ##
      ## If BASE == HEAD, exit with error     ##
      ##########################################
      git status >/dev/null  # make sure we are in a git repostiory
      if [ -n "$BASE" ] || [ -n "$HEAD" ]; then
        if [ -n "$BASE" ]; then
          base_commit=$(git rev-parse "$BASE" 2>/dev/null) || true
        else
          base_commit=""
        fi
        if [ -n "$HEAD" ]; then
          head_commit=$(git rev-parse "$HEAD" 2>/dev/null) || true
        else
          head_commit=""
        fi
        if [ "$base_commit" == "$head_commit" ] ; then
          echo "::error::BASE and HEAD commits are the same. TruffleHog won't scan anything. Please see documentation (https://github.com/trufflesecurity/trufflehog#octocat-trufflehog-github-action)."
          exit 1
        fi
      ##########################################
      ## Scan commits based on event type     ##
      ##########################################
      else
        if [ "${{ github.event_name }}" == "push" ]; then
          COMMIT_LENGTH=$(printenv COMMITS | jq length)
          if [ $COMMIT_LENGTH == "0" ]; then
            echo "No commits to scan"
            exit 0
          fi
          HEAD=${{ github.event.after }}
          if [ ${{ github.event.before }} == "0000000000000000000000000000000000000000" ]; then
            BASE=$(git rev-parse $HEAD~$COMMIT_LENGTH)
          else
            BASE=${{ github.event.before }}
          fi
        elif [ "${{ github.event_name }}" == "workflow_dispatch" ] || [ "${{ github.event_name }}" == "schedule" ]; then
          BASE=""
          HEAD=""
        elif [ "${{ github.event_name }}" == "pull_request" ]; then
          BASE=${{github.event.pull_request.base.sha}}
          HEAD=${{github.event.pull_request.head.sha}}
        fi
      fi
      ##########################################
      ##          Run TruffleHog              ##
      ##########################################
      docker run --rm -v .:/tmp -w /tmp \
      ghcr.io/trufflesecurity/trufflehog:${VERSION} \
      git file:///tmp/ \
      --since-commit \
      ${BASE:-''} \
      --branch \
      ${HEAD:-''} \
      --fail \
      --no-update \
      --github-actions \
      ${ARGS:-''}