FEATURE: Support anonymizing a user's IP addresses

app/services/user_anonymizer.rb

@@ -2,20 +2,23 @@ class UserAnonymizer
 
   attr_reader :user_history
 
-  def initialize(user, actor = nil)
+  # opts:
+  #   anonymize_ip  - an optional new IP to update their logs with
+  def initialize(user, actor = nil, opts = nil)
     @user = user
     @actor = actor
     @user_history = nil
+    @opts = opts || {}
   end
 
-  def self.make_anonymous(user, actor = nil)
-    self.new(user, actor).make_anonymous
+  def self.make_anonymous(user, actor = nil, opts = nil)
+    self.new(user, actor, opts).make_anonymous
   end
 
   def make_anonymous
     User.transaction do
-      prev_email = @user.email
-      prev_username = @user.username
+      @prev_email = @user.email
+      @prev_username = @user.username
 
       if !UsernameChanger.change(@user, make_anon_username)
         raise "Failed to change username"
@@ -28,6 +31,11 @@ class UserAnonymizer
       @user.date_of_birth = nil
       @user.title = nil
       @user.uploaded_avatar_id = nil
+
+      if @opts.has_key?(:anonymize_ip)
+        anonymize_ips(@opts[:anonymize_ip])
+      end
+
       @user.save
 
       options = @user.user_option
@@ -60,8 +68,8 @@ class UserAnonymizer
       }
 
       if SiteSetting.log_anonymizer_details?
-        history_details[:email] = prev_email
-        history_details[:details] = "username: #{prev_username}"
+        history_details[:email] = @prev_email
+        history_details[:details] = "username: #{@prev_username}"
       end
 
       @user_history = UserHistory.create(history_details)
@@ -69,11 +77,39 @@ class UserAnonymizer
     @user
   end
 
-  def make_anon_username
-    100.times do
-      new_username = "anon#{(SecureRandom.random_number * 100000000).to_i}"
-      return new_username unless User.where(username_lower: new_username).exists?
+  private
+
+    def make_anon_username
+      100.times do
+        new_username = "anon#{(SecureRandom.random_number * 100000000).to_i}"
+        return new_username unless User.where(username_lower: new_username).exists?
+      end
+      raise "Failed to generate an anon username"
     end
-    raise "Failed to generate an anon username"
+
+  def ip_where(column = 'user_id')
+    ["#{column} = :user_id AND ip_address IS NOT NULL", user_id: @user.id]
   end
+
+  def anonymize_ips(new_ip)
+    @user.ip_address = new_ip
+    @user.registration_ip_address = new_ip
+
+    IncomingLink.where(ip_where('current_user_id')).update_all(ip_address: new_ip)
+    ScreenedEmail.where(email: @prev_email).update_all(ip_address: new_ip)
+    SearchLog.where(ip_where).update_all(ip_address: new_ip)
+    TopicLinkClick.where(ip_where).update_all(ip_address: new_ip)
+    TopicViewItem.where(ip_where).update_all(ip_address: new_ip)
+    UserHistory.where(ip_where('acting_user_id')).update_all(ip_address: new_ip)
+    UserProfileView.where(ip_where).update_all(ip_address: new_ip)
+
+    # UserHistory for delete_user logs the user's IP. Note this is quite ugly but we don't
+    # have a better way of querying on details right now.
+    UserHistory.where(
+      "action = :action AND details LIKE 'id: #{@user.id}\n%'",
+      action: UserHistory.actions[:delete_user]
+    ).update_all(ip_address: new_ip)
+
+  end
+
 end

spec/services/user_anonymizer_spec.rb

@@ -2,10 +2,10 @@ require "rails_helper"
 
 describe UserAnonymizer do
 
-  describe "make_anonymous" do
-    let(:admin) { Fabricate(:admin) }
-    let(:user) { Fabricate(:user, username: "edward") }
+  let(:admin) { Fabricate(:admin) }
 
+  describe "make_anonymous" do
+    let(:user) { Fabricate(:user, username: "edward") }
     subject(:make_anonymous) { described_class.make_anonymous(user, admin) }
 
     it "changes username" do
@@ -157,4 +157,75 @@ describe UserAnonymizer do
 
   end
 
+  describe "anonymize_ip" do
+    let(:old_ip) { "1.2.3.4" }
+    let(:anon_ip) { "0.0.0.0" }
+    let(:user) { Fabricate(:user, ip_address: old_ip, registration_ip_address: old_ip) }
+    let(:post) { Fabricate(:post) }
+    let(:topic) { post.topic }
+
+    it "doesn't anonymize ips by default" do
+      UserAnonymizer.make_anonymous(user, admin)
+      expect(user.ip_address).to eq(old_ip)
+    end
+
+    it "is called if you pass an option" do
+      UserAnonymizer.make_anonymous(user, admin, anonymize_ip: anon_ip)
+      user.reload
+      expect(user.ip_address).to eq(anon_ip)
+    end
+
+    it "exhaustively replaces all user ips" do
+      link = IncomingLink.create!(current_user_id: user.id, ip_address: old_ip, post_id: post.id)
+
+      screened_email = ScreenedEmail.create!(email: user.email, ip_address: old_ip)
+
+      search_log = SearchLog.create!(
+        term: 'wat',
+        search_type: SearchLog.search_types[:header],
+        user_id: user.id,
+        ip_address: old_ip
+      )
+
+      topic_link = TopicLink.create!(
+        user_id: admin.id,
+        topic_id: topic.id,
+        url: 'https://discourse.org',
+        domain: 'discourse.org'
+      )
+
+      topic_link_click = TopicLinkClick.create!(
+        topic_link_id: topic_link.id,
+        user_id: user.id,
+        ip_address: old_ip
+      )
+
+      user_profile_view = UserProfileView.create!(
+        user_id: user.id,
+        user_profile_id: admin.user_profile.id,
+        ip_address: old_ip,
+        viewed_at: Time.now
+      )
+
+      TopicViewItem.create!(topic_id: topic.id, user_id: user.id, ip_address: old_ip, viewed_at: Time.now)
+      delete_history = StaffActionLogger.new(admin).log_user_deletion(user)
+      user_history = StaffActionLogger.new(user).log_backup_create
+
+      UserAnonymizer.make_anonymous(user, admin, anonymize_ip: anon_ip)
+      expect(user.registration_ip_address).to eq(anon_ip)
+      expect(link.reload.ip_address).to eq(anon_ip)
+      expect(screened_email.reload.ip_address).to eq(anon_ip)
+      expect(search_log.reload.ip_address).to eq(anon_ip)
+      expect(topic_link_click.reload.ip_address).to eq(anon_ip)
+      topic_view = TopicViewItem.where(topic_id: topic.id, user_id: user.id).first
+      expect(topic_view.ip_address).to eq(anon_ip)
+      expect(delete_history.reload.ip_address).to eq(anon_ip)
+      expect(user_history.reload.ip_address).to eq(anon_ip)
+      expect(user_profile_view.reload.ip_address).to eq(anon_ip)
+
+      expect("failed").to eq("success")
+    end
+
+  end
+
 end