markshiz · June 27, 2014 05:23 · Jun 27, 2014
diff --git a/gistfile1.rb b/gistfile1.rb
@@ -0,0 +1,42 @@
+require 'i18n'
+
+module Rack
+  class Locale
+    def initialize(app)
+      @app = app
+    end
+
+    def call(env)
+      old_locale = I18n.locale
+
+      begin
+        locale = accept_locale(env) || I18n.default_locale
+        locale = env['rack.locale'] = I18n.locale = locale.to_s
+        status, headers, body = @app.call(env)
+        headers['Content-Language'] = locale
+        [status, headers, body]
+      ensure
+        I18n.locale = old_locale
+      end
+    end
+
+    private
+
+    # http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4
+    def accept_locale(env)
+      accept_langs = env["HTTP_ACCEPT_LANGUAGE"]
+      return if accept_langs.nil?
+
+      languages_and_qvalues = accept_langs.split(",").map { |l|
+        l += ';q=1.0' unless l =~ /;q=\d+(?:\.\d+)?$/
+        l.split(';q=')
+      }
+
+      lang = languages_and_qvalues.sort_by { |(locale, qvalue)|
+        qvalue.to_f
+      }.last.first
+
+      lang == '*' ? nil : lang
+    end
+  end
+end
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