Class: RailsBrowserTimezone::Filter

Inherits:
Object
  • Object
show all
Defined in:
lib/rails_browser_timezone/filter.rb

Class Method Summary collapse

Class Method Details

.filter(controller, &block) ⇒ Object 



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# File 'lib/rails_browser_timezone/filter.rb', line 5

def self.filter(controller, &block)
  cookies = controller.send(:cookies)
  last_known_tz = cookies[:last_known_tz] ? cookies[:last_known_tz] : Time.zone_default.name
  current_time_zone = time_zone_from_utc_offset(cookies[:utc_offset_summer].to_i, cookies[:utc_offset_winter].to_i, last_known_tz)
  controller.response.set_cookie(:last_known_tz, {:path => "/", :value => current_time_zone.name})

  Time.use_zone(current_time_zone) do
    yield
  end
end

.time_zone_from_utc_offset(utc_offset_summer, utc_offset_winter, last_known_tz) ⇒ Object

Returns the time zone based on parsed utc_offset_summer and utc_offset_winter Returns the default TimeZone if none is resolved



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# File 'lib/rails_browser_timezone/filter.rb', line 18

def self.time_zone_from_utc_offset(utc_offset_summer, utc_offset_winter, last_known_tz)
  # ActiveSupport::TimeZone[offset] - will return the first time zone that matches the offset.
  # But, we need to get the exact time zone inorder to reflect the daylight savings.
  # So, we get the user's time zone exactly by matching the summer offset and winter offset both.
  [ActiveSupport::TimeZone[last_known_tz], ActiveSupport::TimeZone.all].flatten.compact.detect(ifnone = Time.method(:zone_default)) do |zone|
    Time.use_zone(zone.name) do
      Time.zone.parse(Setting.mid_summer_date_str).utc_offset == utc_offset_summer && Time.zone.parse(Setting.mid_winter_date_str).utc_offset == utc_offset_winter
    end
  end
end