class Brakeman::CheckVerbConfusion

def process_if exp
  if exp.condition == @matched_call
    # Found `if request.get?`
    # Do not warn if there is an `elsif` clause
    if node_type? exp.else_clause, :if
      return exp
    end
    warn_about_result @current_result, exp
  end
  exp
end

def process_result result
  @current_result = result
  @matched_call = result[:call]
  klass = tracker.find_class(result[:location][:class])
  # TODO: abstract into tracker.find_location ?
  if klass.nil?
    Brakeman.debug "No class found: #{result[:location][:class]}"
    return
  end
  method = klass.get_method(result[:location][:method])
  if method.nil?
    Brakeman.debug "No method found: #{result[:location][:method]}"
    return
  end
  process method.src
end

def run_check
  calls = tracker.find_call(target: :request, methods: [:get?])
  calls.each do |call|
    process_result call
  end
end

def warn_about_result result, code
  return unless original? result
  confidence = :weak
  message = msg('Potential HTTP verb confusion. ',
                msg_code('HEAD'),
                ' is routed like ',
                msg_code('GET'),
                ' but ',
                msg_code('request.get?'),
                ' will return ',
                msg_code('false')
               )
  warn :result => result,
    :warning_type => "HTTP Verb Confusion",
    :warning_code => :http_verb_confusion,
    :message => message,
    :code => code,
    :user_input => result[:call],
    :confidence => confidence,
    :cwe_id => [352]
end