Whitelisted ip addresses will not be flagged as spam by flag_sockpuppets

app/models/screened_ip_address.rb

@@ -25,8 +25,16 @@ class ScreenedIpAddress < ActiveRecord::Base
   end
 
   def self.should_block?(ip_address)
+    exists_for_ip_address_and_action?(ip_address, actions[:block])
+  end
+
+  def self.is_whitelisted?(ip_address)
+    exists_for_ip_address_and_action?(ip_address, actions[:do_nothing])
+  end
+
+  def self.exists_for_ip_address_and_action?(ip_address, action_type)
     b = match_for_ip_address(ip_address)
     b.record_match! if b
-    !!b and b.action_type == actions[:block]
+    !!b and b.action_type == action_type
   end
 end

app/services/spam_rules_enforcer.rb

@@ -35,7 +35,8 @@ class SpamRulesEnforcer
     !first_post.user.staff? and !@post.user.staff? and
       @post.user != first_post.user and
       @post.user.ip_address == first_post.user.ip_address and
-      @post.user.new_user?
+      @post.user.new_user? and
+      !ScreenedIpAddress.is_whitelisted?(@post.user.ip_address)
   end
 
   def flag_sockpuppet_users

spec/models/screened_ip_address_spec.rb

@@ -146,4 +146,39 @@ describe ScreenedIpAddress do
       end
     end
   end
+
+  describe '#is_whitelisted?' do
+    it 'returns false when record does not exist' do
+      described_class.is_whitelisted?(ip_address).should eq(false)
+    end
+
+    it 'returns false when no record matches' do
+      Fabricate(:screened_ip_address, ip_address: '111.234.23.11', action_type: described_class.actions[:do_nothing])
+      described_class.is_whitelisted?('222.12.12.12').should eq(false)
+    end
+
+    context 'IPv4' do
+      it 'returns true when when record matches and action is :do_nothing' do
+        Fabricate(:screened_ip_address, ip_address: '111.234.23.11', action_type: described_class.actions[:do_nothing])
+        described_class.is_whitelisted?('111.234.23.11').should eq(true)
+      end
+
+      it 'returns false when when record matches and action is :block' do
+        Fabricate(:screened_ip_address, ip_address: '111.234.23.11', action_type: described_class.actions[:block])
+        described_class.is_whitelisted?('111.234.23.11').should eq(false)
+      end
+    end
+
+    context 'IPv6' do
+      it 'returns true when when record matches and action is :do_nothing' do
+        Fabricate(:screened_ip_address, ip_address: '2001:db8::ff00:42:8329', action_type: described_class.actions[:do_nothing])
+        described_class.is_whitelisted?('2001:db8::ff00:42:8329').should eq(true)
+      end
+
+      it 'returns false when when record matches and action is :block' do
+        Fabricate(:screened_ip_address, ip_address: '2001:db8::ff00:42:8329', action_type: described_class.actions[:block])
+        described_class.is_whitelisted?('2001:db8::ff00:42:8329').should eq(false)
+      end
+    end
+  end
 end

spec/services/spam_rules_enforcer_spec.rb

@@ -20,11 +20,17 @@ describe SpamRulesEnforcer do
         SpamRulesEnforcer.new(post2).reply_is_from_sockpuppet?.should eq(false)
       end
 
-      it 'is true if users have the same IP address' do
-        post2 = Fabricate(:post, user: Fabricate(:user, ip_address: '182.189.119.174'), topic: post1.topic)
+      it 'is true if users have the same IP address and are new' do
+        post2 = Fabricate(:post, user: Fabricate(:user, ip_address: user1.ip_address), topic: post1.topic)
         SpamRulesEnforcer.new(post2).reply_is_from_sockpuppet?.should eq(true)
       end
 
+      it 'is false if the ip address is whitelisted' do
+        ScreenedIpAddress.stubs(:is_whitelisted?).with(user1.ip_address).returns(true)
+        post2 = Fabricate(:post, user: Fabricate(:user, ip_address: user1.ip_address), topic: post1.topic)
+        SpamRulesEnforcer.new(post2).reply_is_from_sockpuppet?.should eq(false)
+      end
+
       it 'is false if reply and first post are from the same user' do
         post2 = Fabricate(:post, user: user1, topic: post1.topic)
         SpamRulesEnforcer.new(post2).reply_is_from_sockpuppet?.should eq(false)