Fix "URI.escape is obsolete" warnings on Ruby >= 1.9

lib/simple_oauth/header.rb

@@ -17,11 +17,11 @@ module SimpleOAuth
     end
 
     def self.encode(value)
-      URI.encode(value.to_s, /[^a-z0-9\-\.\_\~]/i)
+      uri_parser.escape(value.to_s, /[^a-z0-9\-\.\_\~]/i)
     end
 
     def self.decode(value)
-      URI.decode(value.to_s)
+      uri_parser.unescape(value.to_s)
     end
 
     def self.parse(header)
@@ -67,6 +67,10 @@ module SimpleOAuth
 
     private
 
+    def self.uri_parser
+      @uri_parser ||= URI.const_defined?(:Parser) ? URI::Parser.new : URI
+    end
+
     def normalized_attributes
       signed_attributes.sort_by{|k,v| k.to_s }.map{|k,v| %(#{k}="#{self.class.encode(v)}") }.join(', ')
     end

spec/helper.rb

@@ -8,6 +8,10 @@ end
 require 'simple_oauth'
 require 'rspec'
 
+def uri_parser
+  @uri_parser ||= URI.const_defined?(:Parser) ? URI::Parser.new : URI
+end
+
 RSpec.configure do |config|
   config.expect_with :rspec do |c|
     c.syntax = :expect

spec/simple_oauth/header_spec.rb

@@ -1,6 +1,6 @@
-#  encoding: utf-8
+# encoding: utf-8
 
-require 'spec_helper'
+require 'helper'
 
 describe SimpleOAuth::Header do
   describe ".default_options" do
@@ -27,7 +27,7 @@ describe SimpleOAuth::Header do
       [' ', '!', '@', '#', '$', '%', '^', '&'].each do |character|
         encoded = SimpleOAuth::Header.encode(character)
         expect(encoded).not_to eq character
-        expect(encoded).to eq URI.encode(character, /.*/)
+        expect(encoded).to eq uri_parser.escape(character, /.*/)
       end
     end