#!/usr/bin/env ruby
#--
# Copyright: Copyright (c) 2010-2016 RightScale, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# 'Software'), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#++

def warn(*args)
  # eliminate ruby/gem warnings from output
end

require 'json'
require 'right_git'
require File.expand_path('../../lib/right_scraper', __FILE__)

if ::ARGV.size != 2
  $stderr.puts "Usage: #{::File.basename(__FILE__)} <options.json> <repository.json>"
  exit 1
end

# specifically trap-and-ignore SIGHUP, SIGTERM and SIGQUIT to prevent the Docker
# container being stopped on service shutdown. also do not emit any output.
# allows SIGINT for development.
%w(HUP TERM QUIT).each { |s| trap(s) {} }

main = nil
begin
  options = ::JSON.load(::File.read(::ARGV.shift))
  fail 'options are invalid' unless options.kind_of?(::Hash)
  repository = ::JSON.load(::File.read(::ARGV.shift))
  fail 'repository is invalid' unless repository.kind_of?(::Hash)

  # use credentials from environment, if available.
  if !(repo_first_cred = ::ENV['REPOSITORY_FIRST_CREDENTIAL'].to_s).empty?
    repository['first_credential'] = repo_first_cred
    if !(repo_second_cred = ::ENV['REPOSITORY_SECOND_CREDENTIAL'].to_s).empty?
      repository['second_credential'] = repo_second_cred
    end
  end

  main = ::RightScraper::Main.new(options)
  if retrieved = main.retrieve(repository)
    # remove any credentials from repository after retrieval; not needed in
    # order to run scanners subsequently.
    %w(first_credential second_credential).each { |k| repository.delete(k) }
    repository['tag'] = retrieved[:repository].revision  # send back commit SHA, if any, for comparison
    repository['repository_hash'] = retrieved[:repository].repository_hash
    retrieved[:repository] = repository
    retrieved[:warnings] = main.warnings unless main.warnings.empty?
    $stdout.puts(::JSON.generate(retrieved))
  else
    result = { errors: main.errors }
    $stdout.puts(::JSON.generate(result))
    exit 2
  end
  exit 0
rescue ::RightScraper::Error, ::RightGit::Shell::ShellError => e
  # all explicitly raised scraper errors derive from these errors.
  result = { errors: [[e.class, :retreive, e.message]] }
  $stdout.puts(::JSON.generate(result))
  exit 3
rescue ::SystemExit => e
  exit e.status
rescue ::Exception => e
  result = {
    errors: [[e.class, :internal_error, e.message]],
    unhandled_exception: {
      class: e.class,
      message: e.message,
      backtrace: (e.backtrace || []).join("\n")
    }
  }
  $stdout.puts(::JSON.generate(result))
  exit 4
ensure
  main.cleanup rescue nil if main
end

@logger.note_error($!, :available, "download retriever is unavailable")