Add a way to add email to block list when nuking a user

app/models/blocked_email.rb

@@ -8,18 +8,24 @@ class BlockedEmail < ActiveRecord::Base
     @actions ||= Enum.new(:block, :do_nothing)
   end
 
+  def self.block(email, opts={})
+    find_by_email(email) || create(opts.slice(:action_type).merge({email: email}))
+  end
+
   def self.should_block?(email)
-    record = BlockedEmail.where(email: email).first
-    if record
-      record.match_count += 1
-      record.last_match_at = Time.zone.now
-      record.save
-    end
-    record && record.action_type == actions[:block]
+    blocked_email = BlockedEmail.where(email: email).first
+    blocked_email.record_match! if blocked_email
+    blocked_email && blocked_email.action_type == actions[:block]
   end
 
   def set_defaults
     self.action_type ||= BlockedEmail.actions[:block]
   end
 
+  def record_match!
+    self.match_count += 1
+    self.last_match_at = Time.zone.now
+    save
+  end
+
 end

lib/user_destroyer.rb

@@ -23,6 +23,10 @@ class UserDestroyer
       end
       user.destroy.tap do |u|
         if u
+          if opts[:block_email]
+            b = BlockedEmail.block(u.email)
+            b.record_match! if b
+          end
           Post.with_deleted.where(user_id: user.id).update_all("nuked_user = true")
           StaffActionLogger.new(@admin).log_user_deletion(user)
           DiscourseHub.unregister_nickname(user.username) if SiteSetting.call_discourse_hub?

spec/components/user_destroyer_spec.rb

@@ -72,6 +72,20 @@ describe UserDestroyer do
       end
     end
 
+    shared_examples "email block list" do
+      it "doesn't add email to block list by default" do
+        BlockedEmail.expects(:block).never
+        destroy
+      end
+
+      it "adds email to block list if block_email is true" do
+        b = Fabricate.build(:blocked_email, email: @user.email)
+        BlockedEmail.expects(:block).with(@user.email).returns(b)
+        b.expects(:record_match!).once.returns(true)
+        UserDestroyer.new(@admin).destroy(@user, destroy_opts.merge({block_email: true}))
+      end
+    end
+
     context 'user has posts' do
       let!(:post) { Fabricate(:post, user: @user) }
 
@@ -98,9 +112,11 @@ describe UserDestroyer do
       end
 
       context "delete_posts is true" do
-        subject(:destroy) { UserDestroyer.new(@admin).destroy(@user, delete_posts: true) }
+        let(:destroy_opts) { {delete_posts: true} }
+        subject(:destroy) { UserDestroyer.new(@admin).destroy(@user, destroy_opts) }
 
         include_examples "successfully destroy a user"
+        include_examples "email block list"
 
         it "deletes the posts" do
           destroy
@@ -113,9 +129,11 @@ describe UserDestroyer do
     context 'user has no posts' do
       context 'and destroy succeeds' do
 
+        let(:destroy_opts) { {} }
         subject(:destroy) { UserDestroyer.new(@admin).destroy(@user) }
 
         include_examples "successfully destroy a user"
+        include_examples "email block list"
 
         it "should mark the user's deleted posts as belonging to a nuked user" do
           post = Fabricate(:post, user: @user, deleted_at: 1.hour.ago)

spec/models/blocked_email_spec.rb

@@ -6,18 +6,48 @@ describe BlockedEmail do
 
   describe "new record" do
     it "sets a default action_type" do
-      BlockedEmail.create(email: email).action_type.should == BlockedEmail.actions[:block]
+      described_class.create(email: email).action_type.should == described_class.actions[:block]
     end
 
     it "last_match_at is null" do
       # If we manually load the table with some emails, we can see whether those emails
       # have ever been blocked by looking at last_match_at.
-      BlockedEmail.create(email: email).last_match_at.should be_nil
+      described_class.create(email: email).last_match_at.should be_nil
     end
   end
 
-  describe "#should_block?" do
-    subject { BlockedEmail.should_block?(email) }
+  describe '#block' do
+    context 'email is not being blocked' do
+      it 'creates a new record with default action of :block' do
+        record = described_class.block(email)
+        record.should_not be_new_record
+        record.email.should == email
+        record.action_type.should == described_class.actions[:block]
+      end
+
+      it 'lets action_type be overriden' do
+        record = described_class.block(email, action_type: described_class.actions[:do_nothing])
+        record.should_not be_new_record
+        record.email.should == email
+        record.action_type.should == described_class.actions[:do_nothing]
+      end
+    end
+
+    context 'email is already being blocked' do
+      let!(:existing) { Fabricate(:blocked_email, email: email) }
+
+      it "doesn't create a new record" do
+        expect { described_class.block(email) }.to_not change { described_class.count }
+      end
+
+      it "returns the existing record" do
+        described_class.block(email).should == existing
+      end
+    end
+  end
+
+  describe '#should_block?' do
+    subject { described_class.should_block?(email) }
 
     it "returns false if a record with the email doesn't exist" do
       subject.should be_false