class Faraday::Response::Json

def initialize(app = nil, parser_options: nil, content_type: /\bjson$/, preserve_raw: false)
  super(app)
  @parser_options = parser_options
  @content_types = Array(content_type)
  @preserve_raw = preserve_raw
end

def on_complete(env)
  process_response(env) if parse_response?(env)
end

def parse(body)
  ::JSON.parse(body, @parser_options || {}) unless body.strip.empty?
end

def parse_response?(env)
  process_response_type?(env) &&
    env[:body].respond_to?(:to_str)
end

def process_response(env)
  env[:raw_body] = env[:body] if @preserve_raw
  env[:body] = parse(env[:body])
rescue StandardError, SyntaxError => e
  raise Faraday::ParsingError.new(e, env[:response])
end

def process_response_type?(env)
  type = response_type(env)
  @content_types.empty? || @content_types.any? do |pattern|
    pattern.is_a?(Regexp) ? type.match?(pattern) : type == pattern
  end
end

def response_type(env)
  type = env[:response_headers][CONTENT_TYPE].to_s
  type = type.split(';', 2).first if type.index(';')
  type
end