Add Residential Proxy API support

Gemfile

@@ -6,7 +6,7 @@ gemspec
 
 group :development do
     gem 'bundler'
-    gem 'minitest'
+    gem 'minitest', '< 6'
     gem 'minitest-reporters'
     gem 'rake'
     gem 'rubocop'

ipinfo-rails.gemspec

@@ -21,7 +21,7 @@ Gem::Specification.new do |s|
     s.homepage = 'https://ipinfo.io'
     s.license = 'Apache-2.0'
 
-    s.add_dependency 'IPinfo', '~> 2.4'
+    s.add_dependency 'IPinfo', '~> 2.5'
     s.add_dependency 'rack', '~> 2.0'
 
     s.add_development_dependency 'mocha', '~> 2.7'

lib/ipinfo-rails.rb

@@ -135,3 +135,33 @@ def call(env)
     @app.call(env)
   end
 end
+
+class IPinfoResproxyMiddleware
+  def initialize(app, options = {})
+    @app = app
+    @token = options.fetch(:token, nil)
+    @ipinfo = IPinfo.create(@token, options)
+    @filter = options.fetch(:filter, nil)
+    @ip_selector = options.fetch(:ip_selector, DefaultIPSelector)
+  end
+
+  def call(env)
+    env['called'] = 'yes'
+    request = Rack::Request.new(env)
+    ip_selector = @ip_selector.new(request)
+    filtered = if @filter.nil?
+                 is_bot(request)
+               else
+                 @filter.call(request)
+               end
+
+    if filtered
+      env['ipinfo_resproxy'] = nil
+    else
+      ip = ip_selector.get_ip
+      env['ipinfo_resproxy'] = @ipinfo.resproxy(ip)
+    end
+
+    @app.call(env)
+  end
+end

test/ipinfo_resproxy_middleware_test.rb

@@ -0,0 +1,194 @@
+# frozen_string_literal: true
+
+require 'minitest/autorun'
+require 'mocha/minitest'
+require 'rack/mock'
+require 'ostruct'
+require 'ipinfo'
+require 'ipinfo/errors'
+require_relative '../lib/ipinfo-rails'
+
+
+# Simple Rack app
+class TestApp
+    attr_reader :last_env
+
+    def call(env)
+        @last_env = env
+        [200, { 'Content-Type' => 'text/plain' }, ['Hello from TestApp!']]
+    end
+end
+
+class IPinfoResproxyMiddlewareTest < Minitest::Test
+    def setup
+        @app = TestApp.new
+        @middleware = nil
+        @mock_ipinfo_client = mock('IPinfoClient')
+        IPinfo.stubs(:create).returns(@mock_ipinfo_client)
+
+        @mock_resproxy = OpenStruct.new(
+            ip: '175.107.211.204',
+            last_seen: '2026-01-15',
+            percent_days_seen: 100,
+            service: 'test_service'
+        )
+    end
+
+    # Custom IP Selector
+    class CustomIPSelector
+        def initialize(request)
+            @request = request
+        end
+
+        def get_ip
+            '9.10.11.12'
+        end
+    end
+
+    def test_should_use_default_ip_selector_when_no_custom_selector_is_provided
+        @mock_ipinfo_client.expects(:resproxy).with('175.107.211.204').returns(@mock_resproxy)
+
+        @middleware = IPinfoResproxyMiddleware.new(@app, token: 'test_token')
+        request = Rack::MockRequest.new(@middleware)
+
+        # Simulate a request with REMOTE_ADDR
+        env = { 'REMOTE_ADDR' => '175.107.211.204' }
+        response = request.get('/', env)
+
+        assert_equal 200, response.status
+        assert_equal 'yes', @app.last_env['called']
+        assert_equal '175.107.211.204', @app.last_env['ipinfo_resproxy'].ip
+        assert_equal 'test_service', @app.last_env['ipinfo_resproxy'].service
+    end
+
+    def test_should_use_custom_ip_selector_when_provided
+        @mock_ipinfo_client.expects(:resproxy).with('9.10.11.12')
+          .returns(@mock_resproxy.dup.tap { |d| d.ip = '9.10.11.12' })
+
+        @middleware = IPinfoResproxyMiddleware.new(@app,
+                                          token: 'test_token',
+                                          ip_selector: CustomIPSelector)
+        request = Rack::MockRequest.new(@middleware)
+
+        response = request.get('/', {})
+
+        assert_equal 200, response.status
+        assert_equal 'yes', @app.last_env['called']
+        assert_equal '9.10.11.12', @app.last_env['ipinfo_resproxy'].ip
+    end
+
+    def test_middleware_skips_processing_if_filter_returns_true
+        always_filter = ->(_request) { true }
+
+        @middleware = IPinfoResproxyMiddleware.new(@app,
+                                          token: 'test_token',
+                                          filter: always_filter)
+        request = Rack::MockRequest.new(@middleware)
+
+        @mock_ipinfo_client.expects(:resproxy).never
+
+        response = request.get('/', { 'REMOTE_ADDR' => '8.8.8.8' })
+
+        assert_equal 200, response.status
+        assert_equal 'yes', @app.last_env['called']
+        assert_nil @app.last_env['ipinfo_resproxy'],
+                   'ipinfo_resproxy should be nil when filtered'
+    end
+
+    def test_middleware_processes_if_filter_returns_false
+        never_filter = ->(_request) { false }
+        @mock_ipinfo_client.expects(:resproxy).with('175.107.211.204').returns(@mock_resproxy)
+
+        @middleware = IPinfoResproxyMiddleware.new(@app,
+                                          token: 'test_token',
+                                          filter: never_filter)
+        request = Rack::MockRequest.new(@middleware)
+
+        response = request.get('/', { 'REMOTE_ADDR' => '175.107.211.204' })
+
+        assert_equal 200, response.status
+        assert_equal 'yes', @app.last_env['called']
+        assert_equal '175.107.211.204', @app.last_env['ipinfo_resproxy'].ip
+    end
+
+    def test_middleware_filters_bots_by_default
+        @mock_ipinfo_client.expects(:resproxy).never # Should not call if bot
+
+        @middleware = IPinfoResproxyMiddleware.new(@app, token: 'test_token')
+        request = Rack::MockRequest.new(@middleware)
+
+        # Test with common bot user agents
+        bot_env = { 'HTTP_USER_AGENT' => 'Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)' }
+        response = request.get('/', bot_env)
+
+        assert_equal 200, response.status
+        assert_equal 'yes', @app.last_env['called']
+        assert_nil @app.last_env['ipinfo_resproxy'],
+                   'ipinfo_resproxy should be nil for bot user agent'
+
+        spider_env = { 'HTTP_USER_AGENT' => 'Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)' }
+        response = request.get('/', spider_env)
+
+        assert_equal 200, response.status
+        assert_equal 'yes', @app.last_env['called']
+        assert_nil @app.last_env['ipinfo_resproxy'],
+                   'ipinfo_resproxy should be nil for spider user agent'
+    end
+
+    def test_middleware_does_not_filter_non_bots_by_default
+        @mock_ipinfo_client.expects(:resproxy).with('175.107.211.204').returns(@mock_resproxy)
+
+        @middleware = IPinfoResproxyMiddleware.new(@app, token: 'test_token')
+        request = Rack::MockRequest.new(@middleware)
+
+        # Test with a regular user agent
+        user_env = { 'REMOTE_ADDR' => '175.107.211.204', 'HTTP_USER_AGENT' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36' }
+        response = request.get('/', user_env)
+
+        assert_equal 200, response.status
+        assert_equal 'yes', @app.last_env['called']
+        assert_equal '175.107.211.204', @app.last_env['ipinfo_resproxy'].ip
+    end
+
+    def test_middleware_handles_missing_user_agent
+        @mock_ipinfo_client.expects(:resproxy).with('175.107.211.204').returns(@mock_resproxy)
+
+        @middleware = IPinfoResproxyMiddleware.new(@app, token: 'test_token')
+        request = Rack::MockRequest.new(@middleware)
+
+        # Test with no user agent provided
+        no_ua_env = { 'REMOTE_ADDR' => '175.107.211.204' }
+        response = request.get('/', no_ua_env)
+
+        assert_equal 200, response.status
+        assert_equal 'yes', @app.last_env['called']
+        assert_equal '175.107.211.204', @app.last_env['ipinfo_resproxy'].ip
+    end
+
+    def test_middleware_handles_ipinfo_api_errors
+        @mock_ipinfo_client.expects(:resproxy).raises(StandardError,
+                                                      'API rate limit exceeded')
+
+        @middleware = IPinfoResproxyMiddleware.new(@app, token: 'test_token')
+        request = Rack::MockRequest.new(@middleware)
+
+        assert_raises StandardError do
+            request.get('/', { 'REMOTE_ADDR' => '175.107.211.204' })
+        end
+    end
+
+    def test_middleware_passes_through_empty_response
+        # Empty response simulates IP not in resproxy database
+        empty_response = OpenStruct.new({})
+        @mock_ipinfo_client.expects(:resproxy).with('175.107.211.204').returns(empty_response)
+
+        @middleware = IPinfoResproxyMiddleware.new(@app, token: 'test_token')
+        request = Rack::MockRequest.new(@middleware)
+
+        response = request.get('/', { 'REMOTE_ADDR' => '175.107.211.204' })
+
+        assert_equal 200, response.status
+        assert_equal 'yes', @app.last_env['called']
+        assert_equal empty_response, @app.last_env['ipinfo_resproxy']
+    end
+end