Add ability to destroy a user with 0 posts

app/assets/javascripts/admin/models/admin_user.js

@@ -17,8 +17,11 @@ Discourse.AdminUser = Discourse.Model.extend({
 
 
   deleteAllPosts: function() {
+    var user = this;
     this.set('can_delete_all_posts', false);
-    Discourse.ajax(Discourse.getURL("/admin/users/") + (this.get('id')) + "/delete_all_posts", {type: 'PUT'});
+    Discourse.ajax(Discourse.getURL("/admin/users/") + (this.get('id')) + "/delete_all_posts", {type: 'PUT'}).then(function(result){
+      user.set('post_count', 0);
+    });
   },
 
   // Revoke the user's admin access
@@ -130,6 +133,41 @@ Discourse.AdminUser = Discourse.Model.extend({
         bootbox.alert(Em.String.i18n('admin.impersonate.invalid'));
       }
     });
+  },
+
+  deleteForbidden: function() {
+    return (this.get('post_count') > 0);
+  }.property('post_count'),
+
+  deleteButtonTitle: function() {
+    if (this.get('deleteForbidden')) {
+      return Em.String.i18n('admin.user.delete_forbidden');
+    } else {
+      return null;
+    }
+  }.property('deleteForbidden'),
+
+  destroy: function() {
+    var user = this;
+    bootbox.confirm(Em.String.i18n("admin.user.delete_confirm"), Em.String.i18n("no_value"), Em.String.i18n("yes_value"), function(result) {
+      if(result) {
+        Discourse.ajax(Discourse.getURL("/admin/users/") + user.get('id') + '.json', { type: 'DELETE' }).then(function(data) {
+          if (data.deleted) {
+            bootbox.alert(Em.String.i18n("admin.user.deleted"), function() {
+              document.location = "/admin/users/list/active";
+            });
+          } else {
+            bootbox.alert(Em.String.i18n("admin.user.delete_failed"));
+            if (data.user) {
+              user.mergeAttributes(data.user);
+            }
+          }
+        }, function(jqXHR, status, error) {
+          Discourse.AdminUser.find( user.get('username') ).then(function(u){ user.mergeAttributes(u); });
+          bootbox.alert(Em.String.i18n("admin.user.delete_failed"));
+        });
+      }
+    });
   }
 
 });
@@ -155,7 +193,7 @@ Discourse.AdminUser.reopenClass({
   find: function(username) {
     return Discourse.ajax({url: Discourse.getURL("/admin/users/") + username}).then(function (result) {
       return Discourse.AdminUser.create(result);
-    })
+    });
   },
 
   findAll: function(query, filter) {

app/assets/javascripts/admin/templates/user.js.handlebars

@@ -187,3 +187,11 @@
   </div>
 </section>
 
+<section>
+  <hr/>
+  <button class="btn pull-right" {{action destroy target="content"}} {{bindAttr disabled="deleteForbidden"}} {{bindAttr title="deleteButtonTitle"}}>
+    <i class="icon icon-trash"></i>
+    {{i18n admin.user.delete}}
+  </button>
+</section>
+<div class="clearfix"></div>

app/assets/javascripts/discourse/helpers/application_helpers.js

@@ -130,6 +130,7 @@ Handlebars.registerHelper('avatar', function(user, options) {
     user = Ember.Handlebars.get(this, user, options);
   }
 
+  if( user ) {
     var username = Em.get(user, 'username');
     if (!username) username = Em.get(user, options.hash.usernamePath);
 
@@ -148,6 +149,9 @@ Handlebars.registerHelper('avatar', function(user, options) {
       title: title || username,
       avatarTemplate: avatarTemplate
     }));
+  } else {
+    return '';
+  }
 });
 
 /**

app/controllers/admin/users_controller.rb

@@ -1,3 +1,5 @@
+require_dependency 'user_destroyer'
+
 class Admin::UsersController < Admin::AdminController
 
   def index
@@ -96,5 +98,14 @@ class Admin::UsersController < Admin::AdminController
     render nothing: true
   end
 
-end
+  def destroy
+    user = User.where(id: params[:id]).first
+    guardian.ensure_can_delete_user!(user)
+    if UserDestroyer.new(current_user).destroy(user)
+      render json: {deleted: true}
+    else
+      render json: {deleted: false, user: AdminDetailedUserSerializer.new(user, root: false).as_json}
+    end
+  end
 
+end

app/models/admin_log.rb

@@ -0,0 +1,16 @@
+# AdminLog stores information about actions that admins and moderators have taken,
+# like deleting users, changing site settings, etc.
+# Use the AdminLogger class to log records to this table.
+class AdminLog < ActiveRecord::Base
+  attr_accessible :action, :admin_id, :target_user_id, :details
+
+  belongs_to :admin,        class_name: 'User'
+  belongs_to :target_user,  class_name: 'User' # can be nil
+
+  validates_presence_of :admin_id
+  validates_presence_of :action
+
+  def self.actions
+    @actions ||= Enum.new(:delete_user)
+  end
+end

app/models/topic.rb

@@ -550,12 +550,16 @@ class Topic < ActiveRecord::Base
       @posters_summary << al[last_post_user_id]
     end
     @posters_summary.map! do |p|
+      if p
         result = TopicPoster.new
         result.user = p
         result.description = descriptions[p.id].join(', ')
         result.extras = "latest" if al[last_post_user_id] == p
         result
+      else
+        nil
       end
+    end.compact!
 
     @posters_summary
   end

app/models/user.rb

@@ -10,7 +10,7 @@ class User < ActiveRecord::Base
   has_many :notifications
   has_many :topic_users
   has_many :topics
-  has_many :user_open_ids
+  has_many :user_open_ids, dependent: :destroy
   has_many :user_actions
   has_many :post_actions
   has_many :email_logs
@@ -21,8 +21,8 @@ class User < ActiveRecord::Base
   has_many :views
   has_many :user_visits
   has_many :invites
-  has_one :twitter_user_info
-  has_one :github_user_info
+  has_one :twitter_user_info, dependent: :destroy
+  has_one :github_user_info, dependent: :destroy
   belongs_to :approved_by, class_name: 'User'
 
   validates_presence_of :username
@@ -397,7 +397,9 @@ class User < ActiveRecord::Base
     posts.order("post_number desc").each do |p|
       if p.post_number == 1
         p.topic.destroy
+        # TODO: But the post is not destroyed. Why?
       else
+        # TODO: This should be using the PostDestroyer!
         p.destroy
       end
     end

app/serializers/topic_view_serializer.rb

@@ -210,6 +210,7 @@ class TopicViewSerializer < ApplicationSerializer
     @highest_number_in_posts = 0
     if object.posts.present?
       object.posts.each_with_index do |p, idx|
+        if p.user
           @highest_number_in_posts = p.post_number if p.post_number > @highest_number_in_posts
           ps = PostSerializer.new(p, scope: scope, root: false)
           ps.topic_slug = object.topic.slug
@@ -227,6 +228,7 @@ class TopicViewSerializer < ApplicationSerializer
           @posts << post_json
         end
       end
+    end
     @posts
   end
 

app/views/topics/show.html.erb

@@ -4,6 +4,7 @@
 <hr/>
 
 <% @topic_view.posts.each do |post| %>
+  <% if post.user %>
     <div class='creator'>
       #<%=post.post_number%> <%= t 'by'%>: <b><%= post.user.name %></b>, <%= post.created_at.to_formatted_s(:long_ordinal) %>
     </div>
@@ -11,6 +12,7 @@
       <%= post.cooked.html_safe %>
     </div>
     <hr/>
+  <% end %>
 <% end %>
 
 <% if @topic_view.next_page %>

app/views/topics/show.rss.erb

@@ -6,6 +6,7 @@
     <description><%= @topic_view.posts.first.raw %></description>
     <atom:link href="<%= Discourse.base_url %><%= @topic_view.relative_url %>.rss" rel="self" type="application/rss+xml" />
     <% @topic_view.recent_posts.each do |post| %>
+      <% if post.user %>
         <item>
           <title><%= @topic_view.title %> at <%= post.created_at %></title>
           <description><![CDATA[
@@ -18,5 +19,6 @@
           <source url="<%= Discourse.base_url %><%= @topic_view.relative_url %>.rss"><%= @topic_view.title %></source>
         </item>
       <% end %>
+    <% end %>
   </channel>
 </rss>

config/locales/client.en.yml

@@ -926,6 +926,11 @@ en:
         approve: 'Approve'
         approved_by: "approved by"
         time_read: "Read Time"
+        delete: "Delete User"
+        delete_forbidden: "This user can't be deleted because there are posts. Delete all this user's posts first."
+        delete_confirm: "Are you SURE you want to permanently delete this user from the site? This action is permanent!"
+        deleted: "The user was deleted."
+        delete_failed: "There was an error deleting that user. Make sure all posts are deleted before trying to delete the user."
 
       site_content:
         none: "Choose a type of content to begin editing."

config/locales/server.en.yml

@@ -886,3 +886,5 @@ en:
     user_content_license: |
       User contributions are licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License](http://creativecommons.org/licenses/by-nc-sa/3.0/deed.en_US). Without limiting any of those representations or warranties, %{company_short_name} has the right (though not the obligation) to, in %{company_short_name}’s sole discretion (i) refuse or remove any content that, in %{company_short_name}’s reasonable opinion, violates any %{company_short_name} policy or is in any way harmful or objectionable, or (ii) terminate or deny access to and use of the Website to any individual or entity for any reason, in %{company_short_name}’s sole discretion. %{company_short_name} will have no obligation to provide a refund of any amounts previously paid.
     miscellaneous: "This Agreement constitutes the entire agreement between %{company_short_name} and you concerning the subject matter hereof, and they may only be modified by a written amendment signed by an authorized executive of %{company_short_name}, or by the posting by %{company_short_name} of a revised version. Except to the extent applicable law, if any, provides otherwise, this Agreement, any access to or use of the Website will be governed by the laws of the state of California, U.S.A., excluding its conflict of law provisions, and the proper venue for any disputes arising out of or relating to any of the same will be the state and federal courts located in San Francisco County, California. Except for claims for injunctive or equitable relief or claims regarding intellectual property rights (which may be brought in any competent court without the posting of a bond), any dispute arising under this Agreement shall be finally settled in accordance with the Comprehensive Arbitration Rules of the Judicial Arbitration and Mediation Service, Inc. (“JAMS”) by three arbitrators appointed in accordance with such Rules. The arbitration shall take place in San Francisco, California, in the English language and the arbitral decision may be enforced in any court. The prevailing party in any action or proceeding to enforce this Agreement shall be entitled to costs and attorneys’ fees. If any part of this Agreement is held invalid or unenforceable, that part will be construed to reflect the parties’ original intent, and the remaining portions will remain in full force and effect. A waiver by either party of any term or condition of this Agreement or any breach thereof, in any one instance, will not waive such term or condition or any subsequent breach thereof. You may assign your rights under this Agreement to any party that consents to, and agrees to be bound by, its terms and conditions; %{company_short_name} may assign its rights under this Agreement without condition. This Agreement will be binding upon and will inure to the benefit of the parties, their successors and permitted assigns."
+
+  deleted: 'deleted'

db/migrate/20130411205132_create_admin_logs.rb

@@ -0,0 +1,15 @@
+class CreateAdminLogs < ActiveRecord::Migration
+  def up
+    create_table :admin_logs do |t|
+      t.integer :action,          null: false
+      t.integer :admin_id,        null: false
+      t.integer :target_user_id
+      t.text    :details
+      t.timestamps
+    end
+  end
+
+  def down
+    drop_table :admin_logs
+  end
+end

lib/admin_logger.rb

@@ -0,0 +1,16 @@
+# Responsible for logging the actions of admins and moderators.
+class AdminLogger
+  def initialize(admin)
+    @admin = admin
+    raise Discourse::InvalidParameters.new('admin is nil') unless @admin and @admin.is_a?(User)
+  end
+
+  def log_user_deletion(deleted_user)
+    raise Discourse::InvalidParameters.new('user is nil') unless deleted_user and deleted_user.is_a?(User)
+    AdminLog.create(
+      action: AdminLog.actions[:delete_user],
+      admin_id: @admin.id,
+      details: [:id, :username, :name, :created_at, :trust_level, :last_seen_at, :last_emailed_at].map { |x| "#{x}: #{deleted_user.send(x)}" }.join(', ')
+    )
+  end
+end

lib/guardian.rb

@@ -148,6 +148,13 @@ class Guardian
     true
   end
 
+  def can_delete_user?(user_to_delete)
+    return false unless @user.try(:admin?)
+    return false if user_to_delete.blank?
+    return false if user_to_delete.post_count > 0
+    true
+  end
+
   # Can we see who acted on a post in a particular way?
   def can_see_post_actors?(topic, post_action_type_id)
     return false unless topic.present?

lib/user_destroyer.rb

@@ -0,0 +1,27 @@
+require_dependency 'admin_logger'
+
+# Responsible for destroying a User record
+class UserDestroyer
+
+  class PostsExistError < RuntimeError; end
+
+  def initialize(admin)
+    @admin = admin
+    raise Discourse::InvalidParameters.new('admin is nil') unless @admin and @admin.is_a?(User)
+    raise Discourse::InvalidAccess unless @admin.admin?
+  end
+
+  # Returns false if the user failed to be deleted.
+  # Returns a frozen instance of the User if the delete succeeded.
+  def destroy(user)
+    raise Discourse::InvalidParameters.new('user is nil') unless user and user.is_a?(User)
+    raise PostsExistError if user.post_count != 0
+    user.destroy.tap do |u|
+      if u
+        AdminLogger.new(@admin).log_user_deletion(user)
+        MessageBus.publish "/file-change", ["refresh"], user_ids: [user.id]
+      end
+    end
+  end
+
+end

spec/components/admin_logger_spec.rb

@@ -0,0 +1,35 @@
+require 'spec_helper'
+require_dependency 'admin_logger'
+
+describe AdminLogger do
+
+  describe 'new' do
+    it 'raises an error when user is nil' do
+      expect { AdminLogger.new(nil) }.to raise_error(Discourse::InvalidParameters)
+    end
+
+    it 'raises an error when user is not a User' do
+      expect { AdminLogger.new(5) }.to raise_error(Discourse::InvalidParameters)
+    end
+  end
+
+  describe 'log_user_deletion' do
+    let(:admin) { Fabricate(:admin) }
+    let(:deleted_user) { Fabricate(:user) }
+
+    subject(:log_user_deletion) { AdminLogger.new(admin).log_user_deletion(deleted_user) }
+
+    it 'raises an error when user is nil' do
+      expect { AdminLogger.new(admin).log_user_deletion(nil) }.to raise_error(Discourse::InvalidParameters)
+    end
+
+    it 'raises an error when user is not a User' do
+      expect { AdminLogger.new(admin).log_user_deletion(1) }.to raise_error(Discourse::InvalidParameters)
+    end
+
+    it 'creates a new AdminLog record' do
+      expect { log_user_deletion }.to change { AdminLog.count }.by(1)
+    end
+  end
+
+end

spec/components/guardian_spec.rb

@@ -862,5 +862,34 @@ describe Guardian do
 
   end
 
+  context "can_delete_user?" do
+    it "is false without a logged in user" do
+      Guardian.new(nil).can_delete_user?(user).should be_false
+    end
+
+    it "is false without a user to look at" do
+      Guardian.new(admin).can_delete_user?(nil).should be_false
+    end
+
+    it "is false for regular users" do
+      Guardian.new(user).can_delete_user?(coding_horror).should be_false
+    end
+
+    it "is false for moderators" do
+      Guardian.new(moderator).can_delete_user?(coding_horror).should be_false
+    end
+
+    context "for admins" do
+      it "is false if user has posts" do
+        Fabricate(:post, user: user)
+        Guardian.new(admin).can_delete_user?(user).should be_false
+      end
+
+      it "is true if user has no posts" do
+        Guardian.new(admin).can_delete_user?(user).should be_true
+      end
+    end
+  end
+
 end
 

spec/components/user_destroyer_spec.rb

@@ -0,0 +1,97 @@
+require 'spec_helper'
+require_dependency 'user_destroyer'
+
+describe UserDestroyer do
+  describe 'new' do
+    it 'raises an error when user is nil' do
+      expect { UserDestroyer.new(nil) }.to raise_error(Discourse::InvalidParameters)
+    end
+
+    it 'raises an error when user is not a User' do
+      expect { UserDestroyer.new(5) }.to raise_error(Discourse::InvalidParameters)
+    end
+
+    it 'raises an error when user is a regular user' do
+      expect { UserDestroyer.new( Fabricate(:user) ) }.to raise_error(Discourse::InvalidAccess)
+    end
+
+    it 'raises an error when user is a moderator' do
+      expect { UserDestroyer.new( Fabricate(:moderator) ) }.to raise_error(Discourse::InvalidAccess)
+    end
+
+    it 'returns an instance of UserDestroyer when user is an admin' do
+      UserDestroyer.new( Fabricate(:admin) ).should be_a(UserDestroyer)
+    end
+  end
+
+  describe 'destroy' do
+    before do
+      @admin = Fabricate(:admin)
+      @user = Fabricate(:user)
+    end
+
+    subject(:destroy) { UserDestroyer.new(@admin).destroy(@user) }
+
+    it 'raises an error when user is nil' do
+      expect { UserDestroyer.new(@admin).destroy(nil) }.to raise_error(Discourse::InvalidParameters)
+    end
+
+    it 'raises an error when user is not a User' do
+      expect { UserDestroyer.new(@admin).destroy('nothing') }.to raise_error(Discourse::InvalidParameters)
+    end
+
+    context 'user has posts' do
+      before do
+        Fabricate(:post, user: @user)
+      end
+
+      it 'should not delete the user' do
+        expect { destroy rescue nil }.to_not change { User.count }
+      end
+
+      it 'should raise an error' do
+        expect { destroy }.to raise_error( UserDestroyer::PostsExistError )
+      end
+
+      it 'should not log the action' do
+        AdminLogger.any_instance.expects(:log_user_deletion).never
+        destroy rescue nil
+      end
+    end
+
+    context 'user has no posts' do
+      context 'and destroy succeeds' do
+        it 'should delete the user' do
+          expect { destroy }.to change { User.count }.by(-1)
+        end
+
+        it 'should return the deleted user record' do
+          return_value = destroy
+          return_value.should == @user
+          return_value.should be_destroyed
+        end
+
+        it 'should log the action' do
+          AdminLogger.any_instance.expects(:log_user_deletion).with(@user).once
+          destroy
+        end
+      end
+
+      context 'and destroy fails' do
+        before do
+          @user.stubs(:destroy).returns(false)
+        end
+
+        it 'should return false' do
+          destroy.should == false
+        end
+
+        it 'should not log the action' do
+          AdminLogger.any_instance.expects(:log_user_deletion).never
+          destroy
+        end
+      end
+    end
+  end
+
+end

spec/controllers/admin/users_controller_spec.rb

@@ -161,6 +161,34 @@ describe Admin::UsersController do
       end
     end
 
+    context '.destroy' do
+      before do
+        @delete_me = Fabricate(:user)
+      end
+
+      it "raises an error when the user doesn't have permission" do
+        Guardian.any_instance.expects(:can_delete_user?).with(@delete_me).returns(false)
+        xhr :delete, :destroy, id: @delete_me.id
+        response.should be_forbidden
+      end
+
+      it "returns a 403 if the user doesn't exist" do
+        xhr :delete, :destroy, id: 123123
+        response.should be_forbidden
+      end
+
+      it "returns an error if the user has posts" do
+        Fabricate(:post, user: @delete_me)
+        xhr :delete, :destroy, id: @delete_me.id
+        response.should be_forbidden
+      end
+
+      it "deletes the user record" do
+        UserDestroyer.any_instance.expects(:destroy).returns(true)
+        xhr :delete, :destroy, id: @delete_me.id
+      end
+    end
+
   end
 
 end

spec/models/admin_log_spec.rb

@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe AdminLog do
+  # Nothing fancy going on in this model. See AdminLogger.
+end