Sinatra server JSON file get requests mirroring directory structure

jsonfileserv.rb

require 'sinatra/base'
require 'json'
require 'pathname'

FIXTURESDIR="fixtures"

class JSONFileServer < Sinatra::Base

#TODO: When request is not JSON return 406
# when request.accept.include?("application/json") #JSON requested

get '*' do
  path = Pathname.new("#{File.dirname(__FILE__)}/#{FIXTURESDIR}#{params[:splat].first()}")
  pathPlusJson = Pathname.new("#{path}.json")
  if path.directory?
    response = get_directory_contents_array(path.to_path)
    return response.to_json
  elsif pathPlusJson.exist? and pathPlusJson.file?
    response = JSON.parse(IO.read(pathPlusJson.to_path))
    return response.to_json
  else
    return create_response( {"error" => "Not Found" }.to_json, 404 )
  end
end

post '*' do
  path = Pathname.new("#{File.dirname(__FILE__)}/#{FIXTURESDIR}#{params[:splat].first()}")
  if !File.exist?(path.dirname())
    return create_response( {"error" => "Not Found" }.to_json, 404 )
  end
  filename = Pathname.new("#{path.to_path}.json")
  if File.exist?(filename.to_path())
    return create_response( {"error" => "Resource already exists" }.to_json, 409 )
  end
  body_data = JSON.parse(request.body.string)
  write_hash_to_file_json(filename,body_data)
  return 200
end

#Put doesn't currently do any actual updating, it simply stomps the contents of an existing 
#resource with the same name as the one being put.

put '*' do
  path = Pathname.new("#{File.dirname(__FILE__)}/#{FIXTURESDIR}#{params[:splat].first()}")
  if !File.exist?(path.dirname())
    return create_response( {"error" => "Not Found" }.to_json, 404 )
  end
  filename = Pathname.new("#{path.to_path}.json")
  body_data = JSON.parse(request.body.string)
  write_hash_to_file_json(filename,body_data)
  return 200
end

delete '*' do
  path = Pathname.new("#{File.dirname(__FILE__)}/#{FIXTURESDIR}#{params[:splat].first()}")
  if !File.exist?(path.dirname())
    return create_response( {"error" => "Not Found" }.to_json, 404 )
  end
  filename = Pathname.new("#{path.to_path}.json")
  if !File.exist?(filename.to_path())
    return create_response( {"error" => "Not Found" }.to_json, 404 )
  end
  FileUtils.rm(filename.to_path())
  return 200
end

def get_directory_contents_array(path)
  size = 0
  if !path.end_with?("/")
    path += "/"
  end
  path += "*"
  files = Dir[path].select { |fpath| !File.directory? fpath }
  if files.length == 0
    return create_response( {"error" => "Not Found" }.to_json, 404 )
  end
  response = files.map { |file_name| JSON.parse(IO.read(file_name)) }
  return response
end

def create_response(body,status)
    response = Array.new(2)
    response[0] = status
    response[1] = body
    return response
end

def write_hash_to_file_json(fullpath,contents)
  IO.write(fullpath.to_path, contents.to_json, 0)
end

end

if __FILE__ == $0
  JSONFileServer.run!
end