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Versions: 9
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Contents
require 'timezone/lookup/basic'
require 'timezone/error'
require 'json'
require 'uri'
module Timezone
module Lookup
# @!visibility private
class Geonames < ::Timezone::Lookup::Basic
# Status code used by GeoNames to indicate that the lookup succeeded, but
# there is no timezone information for the given <lat, lng>. This can
# happen if the <lat, lng> resolves to a point in the middle of the ocean,
# for example.
NO_TIMEZONE_INFORMATION = 15
def initialize(config)
if config.username.nil?
raise(::Timezone::Error::InvalidConfig, 'missing username'.freeze)
end
config.protocol ||= 'http'.freeze
config.url ||= 'api.geonames.org'.freeze
super
end
def lookup(lat, long)
response = client.get(url(lat, long))
return unless response.body
data = JSON.parse(response.body)
timezone_id = get_timezone_id(data)
return timezone_id if timezone_id
return unless data['status']
return if NO_TIMEZONE_INFORMATION == data['status']['value']
raise(Timezone::Error::GeoNames, data['status']['message'])
rescue => e
raise(Timezone::Error::GeoNames, e.message)
end
private
def get_timezone_id(data)
return data['timezoneId'] if data['timezoneId']
if config.offset_etc_zones && data['gmtOffset']
return unless data['gmtOffset'].is_a? Numeric
return 'Etc/UTC' if data['gmtOffset'] == 0
"Etc/GMT#{format('%+d', -data['gmtOffset'])}"
end
end
def url(lat, long)
query = URI.encode_www_form(
'lat' => lat,
'lng' => long,
'username' => config.username
)
"/timezoneJSON?#{query}"
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems