class Aws::Rest::Request::Endpoint

def apply_path_params(uri, params)
  path = uri.path.sub(/\/$/, '') + @path_pattern.split('?')[0]
  uri.path = path.gsub(/{.+?}/) do |placeholder|
    param_value_for_placeholder(placeholder, params)
  end
end

def apply_querystring_params(uri, params)
  # collect params that are supposed to be part of the query string
  parts = @rules.shape.members.inject([]) do |prts, (member_name, member_ref)|
    if member_ref.location == 'querystring' && !params[member_name].nil?
      prts << [member_ref, params[member_name]]
    end
    prts
  end
  querystring = QuerystringBuilder.new.build(parts)
  querystring = [@query_prefix, querystring == '' ? nil : querystring].compact.join('&')
  querystring = nil if querystring == ''
  uri.query = querystring
end

def escape(string)
  Seahorse::Util.uri_escape(string)
end

def initialize(rules, request_uri_pattern)
  @rules = rules
  request_uri_pattern.split('?').tap do |path_part, query_part|
    @path_pattern = path_part
    @query_prefix = query_part
  end
end

def param_name(placeholder)
  location_name = placeholder.gsub(/[{}+]/,'')
  param_name, _ = @rules.shape.member_by_location_name(location_name)
  param_name
end

def param_value_for_placeholder(placeholder, params)
  name = param_name(placeholder)
  value = params[name].to_s
  raise ArgumentError, ":#{name} must not be blank" if value.empty?
  if placeholder.include?('+')
    value.gsub(/[^\/]+/) { |v| escape(v) }
  else
    escape(value)
  end
end

def uri(base_uri, params)
  uri = URI.parse(base_uri.to_s)
  apply_path_params(uri, params)
  apply_querystring_params(uri, params)
  uri
end