Merge branch 'master' into openid

[rails.git] / app / controllers / user_controller.rb

diff --git a/app/controllers/user_controller.rb b/app/controllers/user_controller.rb
index 93cc3a6a5688e480116ee7c84b0ae362086b3e3c..aae059252242d292e083dfc3066f752cdfa0d181 100644 (file)
--- a/app/controllers/user_controller.rb
+++ b/app/controllers/user_controller.rb
@@ -4,32 +4,92 @@ class UserController < ApplicationController
   before_filter :authorize, :only => [:api_details, :api_gpx_files]
   before_filter :authorize_web, :except => [:api_details, :api_gpx_files]
   before_filter :set_locale, :except => [:api_details, :api_gpx_files]
   before_filter :authorize, :only => [:api_details, :api_gpx_files]
   before_filter :authorize_web, :except => [:api_details, :api_gpx_files]
   before_filter :set_locale, :except => [:api_details, :api_gpx_files]

-  before_filter :require_user, :only => [:set_home, :account, :go_public, :make_friend, :remove_friend, :upload_image, :delete_image]
+  before_filter :require_user, :only => [:account, :go_public, :make_friend, :remove_friend]

   before_filter :check_database_readable, :except => [:api_details, :api_gpx_files]
   before_filter :check_database_readable, :except => [:api_details, :api_gpx_files]

-  before_filter :check_database_writable, :only => [:login, :new, :set_home, :account, :go_public, :make_friend, :remove_friend, :upload_image, :delete_image]
+  before_filter :check_database_writable, :only => [:login, :new, :account, :go_public, :make_friend, :remove_friend]

   before_filter :check_api_readable, :only => [:api_details, :api_gpx_files]
   before_filter :require_allow_read_prefs, :only => [:api_details]
   before_filter :require_allow_read_gpx, :only => [:api_gpx_files]
   before_filter :check_api_readable, :only => [:api_details, :api_gpx_files]
   before_filter :require_allow_read_prefs, :only => [:api_details]
   before_filter :require_allow_read_gpx, :only => [:api_gpx_files]

+  before_filter :require_cookies, :only => [:login, :confirm]
+  before_filter :require_administrator, :only => [:set_status, :delete, :list]
+  before_filter :lookup_this_user, :only => [:set_status, :delete]

 
   filter_parameter_logging :password, :pass_crypt, :pass_crypt_confirmation
 
 
   filter_parameter_logging :password, :pass_crypt, :pass_crypt_confirmation
 

+  cache_sweeper :user_sweeper, :only => [:account, :set_status, :delete], :unless => OSM_STATUS == :database_offline
+
+  def terms
+    @title = t 'user.new.title'
+    @legale = params[:legale] || OSM.IPToCountry(request.remote_ip) || APP_CONFIG['default_legale']
+    @text = OSM.legal_text_for_country(@legale)
+
+    if request.xhr?
+      render :update do |page|
+        page.replace_html "contributorTerms", :partial => "terms"
+      end
+    elsif params[:user]
+      session[:referer] = params[:referer]
+
+      @user = User.new(params[:user])
+
+      if params[:user][:openid_url] and @user.pass_crypt.empty?
+        # We are creating an account with OpenID and no password
+        # was specified so create a random one
+        @user.pass_crypt = ActiveSupport::SecureRandom.base64(16) 
+        @user.pass_crypt_confirmation = @user.pass_crypt 
+      end
+
+      if @user.valid?
+        if params[:user][:openid_url].nil? or
+            params[:user][:openid_url].empty?
+          # No OpenID so just move on to the terms
+          render :action => 'terms'
+        else
+          # Verify OpenID before moving on
+          session[:new_user] = @user
+          openid_verify(params[:user][:openid_url], @user)
+        end
+      else
+        # Something is wrong, so rerender the form
+        render :action => 'new'
+      end
+    elsif using_open_id?
+      # The redirect from the OpenID provider reenters here
+      # again and we need to pass the parameters through to
+      # the open_id_authentication function
+      @user = session.delete(:new_user)
+
+      openid_verify(nil, @user) do |user|
+      end
+
+      if @user.openid_url.nil? or @user.invalid?
+        render :action => 'new'
+      else
+        render :action => 'terms'
+      end
+    end
+  end
+

   def save
     @title = t 'user.new.title'
 
     if Acl.find_by_address(request.remote_ip, :conditions => {:k => "no_account_creation"})
       render :action => 'new'
   def save
     @title = t 'user.new.title'
 
     if Acl.find_by_address(request.remote_ip, :conditions => {:k => "no_account_creation"})
       render :action => 'new'

+    elsif params[:decline]
+      redirect_to t('user.terms.declined')

     else
       @user = User.new(params[:user])
 
     else
       @user = User.new(params[:user])
 

-      @user.visible = true
+      @user.status = "pending"

       @user.data_public = true
       @user.description = "" if @user.description.nil?
       @user.creation_ip = request.remote_ip
       @user.languages = request.user_preferred_languages
       @user.data_public = true
       @user.description = "" if @user.description.nil?
       @user.creation_ip = request.remote_ip
       @user.languages = request.user_preferred_languages

+      @user.terms_agreed = Time.now.getutc

 
       if @user.save
         flash[:notice] = t 'user.new.flash create success message'
 
       if @user.save
         flash[:notice] = t 'user.new.flash create success message'

-        Notifier.deliver_signup_confirm(@user, @user.tokens.create(:referer => params[:referer]))
+        Notifier.deliver_signup_confirm(@user, @user.tokens.create(:referer => session.delete(:referer)))

         redirect_to :action => 'login'
       else
         render :action => 'new'
         redirect_to :action => 'login'
       else
         render :action => 'new'


@@ -42,11 +102,8 @@ class UserController < ApplicationController
     @tokens = @user.oauth_tokens.find :all, :conditions => 'oauth_tokens.invalidated_at is null and oauth_tokens.authorized_at is not null'
 
     if params[:user] and params[:user][:display_name] and params[:user][:description]
     @tokens = @user.oauth_tokens.find :all, :conditions => 'oauth_tokens.invalidated_at is null and oauth_tokens.authorized_at is not null'
 
     if params[:user] and params[:user][:display_name] and params[:user][:description]

-      if params[:user][:email] != @user.email
-        @user.new_email = params[:user][:email]
-      end
-

       @user.display_name = params[:user][:display_name]
       @user.display_name = params[:user][:display_name]

+      @user.new_email = params[:user][:new_email]

 
       if params[:user][:pass_crypt].length > 0 or params[:user][:pass_crypt_confirmation].length > 0
         @user.pass_crypt = params[:user][:pass_crypt]
 
       if params[:user][:pass_crypt].length > 0 or params[:user][:pass_crypt_confirmation].length > 0
         @user.pass_crypt = params[:user][:pass_crypt]


@@ -55,29 +112,34 @@ class UserController < ApplicationController
 
       @user.description = params[:user][:description]
       @user.languages = params[:user][:languages].split(",")
 
       @user.description = params[:user][:description]
       @user.languages = params[:user][:languages].split(",")

+
+      case params[:image_action]
+        when "new" then @user.image = params[:user][:image]
+        when "delete" then @user.image = nil
+      end
+

       @user.home_lat = params[:user][:home_lat]
       @user.home_lon = params[:user][:home_lon]
 
       @user.home_lat = params[:user][:home_lat]
       @user.home_lon = params[:user][:home_lon]
 

-      if @user.save
-        set_locale
+      @user.openid_url = nil if params[:user][:openid_url].empty?

 
 

-        if params[:user][:email] == @user.new_email
-          flash[:notice] = t 'user.account.flash update success confirm needed'
-          Notifier.deliver_email_confirm(@user, @user.tokens.create)
-        else
-          flash[:notice] = t 'user.account.flash update success'
-        end
+      if params[:user][:openid_url].length > 0 and
+         params[:user][:openid_url] != @user.openid_url
+        # If the OpenID has changed, we want to check that it is a
+        # valid OpenID and one the user has control over before saving
+        # it as a password equivalent for the user.
+        session[:new_user] = @user
+        openid_verify(params[:user][:openid_url], @user)
+      else
+        update_user(@user)

       end
       end

-    end
-  end
-
-  def set_home
-    if params[:user][:home_lat] and params[:user][:home_lon]
-      @user.home_lat = params[:user][:home_lat].to_f
-      @user.home_lon = params[:user][:home_lon].to_f
-      if @user.save
-        flash[:notice] = t 'user.set_home.flash success'
-        redirect_to :controller => 'user', :action => 'account'
+    elsif using_open_id?
+      # The redirect from the OpenID provider reenters here
+      # again and we need to pass the parameters through to
+      # the open_id_authentication function
+      @user = session.delete(:new_user)
+      openid_verify(nil, @user) do |user|
+        update_user(user)

       end
     end
   end
       end
     end
   end


@@ -93,14 +155,15 @@ class UserController < ApplicationController
     @title = t 'user.lost_password.title'
 
     if params[:user] and params[:user][:email]
     @title = t 'user.lost_password.title'
 
     if params[:user] and params[:user][:email]

-      user = User.find_by_email(params[:user][:email], :conditions => {:visible => true})
+      user = User.find_by_email(params[:user][:email], :conditions => {:status => ["pending", "active", "confirmed"]})

 
       if user
         token = user.tokens.create
         Notifier.deliver_lost_password(user, token)
 
       if user
         token = user.tokens.create
         Notifier.deliver_lost_password(user, token)

-        @notice = t 'user.lost_password.notice email on way'
+        flash[:notice] = t 'user.lost_password.notice email on way'
+        redirect_to :action => 'login'

       else
       else

-        @notice = t 'user.lost_password.notice email cannot find'
+        flash.now[:error] = t 'user.lost_password.notice email cannot find'

       end
     end
   end
       end
     end
   end


@@ -117,7 +180,7 @@ class UserController < ApplicationController
         if params[:user]
           @user.pass_crypt = params[:user][:pass_crypt]
           @user.pass_crypt_confirmation = params[:user][:pass_crypt_confirmation]
         if params[:user]
           @user.pass_crypt = params[:user][:pass_crypt]
           @user.pass_crypt_confirmation = params[:user][:pass_crypt_confirmation]

-          @user.active = true
+          @user.status = "active" if @user.status == "pending"

           @user.email_valid = true
 
           if @user.save
           @user.email_valid = true
 
           if @user.save


@@ -127,7 +190,7 @@ class UserController < ApplicationController
           end
         end
       else
           end
         end
       else

-        flash[:notice] = t 'user.reset_password.flash token bad'
+        flash[:error] = t 'user.reset_password.flash token bad'

         redirect_to :action => 'lost_password'
       end
     end
         redirect_to :action => 'lost_password'
       end
     end


@@ -135,58 +198,50 @@ class UserController < ApplicationController
 
   def new
     @title = t 'user.new.title'
 
   def new
     @title = t 'user.new.title'

+    @referer = params[:referer] || session[:referer]

 
 

-    # The user is logged in already, so don't show them the signup page, instead
-    # send them to the home page
-    redirect_to :controller => 'site', :action => 'index' if session[:user]
+    if session[:user]
+      # The user is logged in already, so don't show them the signup
+      # page, instead send them to the home page
+      redirect_to :controller => 'site', :action => 'index'
+    elsif not params['openid'].nil?
+      flash.now[:notice] = t 'user.new.openid association'
+    end

   end
 
   def login
   end
 
   def login

-    if params[:user] and session[:user].nil?
-      email_or_display_name = params[:user][:email]
-      pass = params[:user][:password]
-      user = User.authenticate(:username => email_or_display_name, :password => pass)
-      if user
-        session[:user] = user.id
-      elsif User.authenticate(:username => email_or_display_name, :password => pass, :inactive => true)
-        @notice = t 'user.login.account not active'
-      else
-        @notice = t 'user.login.auth failure'
-      end
-    end
+    if params[:username] or using_open_id?
+      session[:remember_me] ||= params[:remember_me]
+      session[:referer] ||= params[:referer]

 
 

-    if session[:user]
-      # The user is logged in, if the referer param exists, redirect them to that
-      # unless they've also got a block on them, in which case redirect them to 
-      # the block so they can clear it.
-      user = User.find(session[:user])
-      block = user.blocked_on_view
-      if block
-        redirect_to block, :referrer => params[:referrer]
-      elsif params[:referer]
-        redirect_to params[:referer]
+      if using_open_id?
+        openid_authentication(params[:openid_url])

       else
       else

-        redirect_to :controller => 'site', :action => 'index'
+        password_authentication(params[:username], params[:password])

       end
       end

-      return
+    else
+      @title = t 'user.login.title'

     end
     end

-
-    @title = t 'user.login.title'

   end
 
   def logout
   end
 
   def logout

-    if session[:token]
-      token = UserToken.find_by_token(session[:token])
-      if token
-        token.destroy
+    @title = t 'user.logout.title'
+
+    if params[:session] == request.session_options[:id]
+      if session[:token]
+        token = UserToken.find_by_token(session[:token])
+        if token
+          token.destroy
+        end
+        session[:token] = nil
+      end
+      session[:user] = nil
+      session_expires_automatically
+      if params[:referer]
+        redirect_to params[:referer]
+      else
+        redirect_to :controller => 'site', :action => 'index'

       end
       end

-      session[:token] = nil
-    end
-    session[:user] = nil
-    if params[:referer]
-      redirect_to params[:referer]
-    else
-      redirect_to :controller => 'site', :action => 'index'

     end
   end
 
     end
   end
 


@@ -195,7 +250,7 @@ class UserController < ApplicationController
       token = UserToken.find_by_token(params[:confirm_string])
       if token and !token.user.active?
         @user = token.user
       token = UserToken.find_by_token(params[:confirm_string])
       if token and !token.user.active?
         @user = token.user

-        @user.active = true
+        @user.status = "active"

         @user.email_valid = true
         @user.save!
         referer = token.referer
         @user.email_valid = true
         @user.save!
         referer = token.referer


@@ -208,7 +263,7 @@ class UserController < ApplicationController
           redirect_to :action => 'account', :display_name => @user.display_name
         end
       else
           redirect_to :action => 'account', :display_name => @user.display_name
         end
       else

-        @notice = t 'user.confirm.failure'
+        flash.now[:error] = t 'user.confirm.failure'

       end
     end
   end
       end
     end
   end


@@ -220,31 +275,21 @@ class UserController < ApplicationController
         @user = token.user
         @user.email = @user.new_email
         @user.new_email = nil
         @user = token.user
         @user.email = @user.new_email
         @user.new_email = nil

-        @user.active = true

         @user.email_valid = true
         @user.email_valid = true

-        @user.save!
+        if @user.save
+          flash[:notice] = t 'user.confirm_email.success'
+        else
+          flash[:errors] = @user.errors
+        end

         token.destroy
         token.destroy

-        flash[:notice] = t 'user.confirm_email.success'

         session[:user] = @user.id
         redirect_to :action => 'account', :display_name => @user.display_name
       else
         session[:user] = @user.id
         redirect_to :action => 'account', :display_name => @user.display_name
       else

-        @notice = t 'user.confirm_email.failure'
+        flash.now[:error] = t 'user.confirm_email.failure'

       end
     end
   end
 
       end
     end
   end
 

-  def upload_image
-    @user.image = params[:user][:image]
-    @user.save!
-    redirect_to :controller => 'user', :action => 'view', :display_name => @user.display_name
-  end
-
-  def delete_image
-    @user.image = nil
-    @user.save!
-    redirect_to :controller => 'user', :action => 'view', :display_name => @user.display_name
-  end
-

   def api_gpx_files
     doc = OSM::API.new.get_xml_doc
     @user.traces.each do |trace|
   def api_gpx_files
     doc = OSM::API.new.get_xml_doc
     @user.traces.each do |trace|


@@ -254,9 +299,10 @@ class UserController < ApplicationController
   end
 
   def view
   end
 
   def view

-    @this_user = User.find_by_display_name(params[:display_name], :conditions => {:visible => true})
+    @this_user = User.find_by_display_name(params[:display_name])

 
 

-    if @this_user
+    if @this_user and
+       (@this_user.visible? or (@user and @user.administrator?))

       @title = @this_user.display_name
     else
       @title = t 'user.no_such_user.title'
       @title = @this_user.display_name
     else
       @title = t 'user.no_such_user.title'


@@ -266,9 +312,9 @@ class UserController < ApplicationController
   end
 
   def make_friend
   end
 
   def make_friend

-    if params[:display_name]     
+    if params[:display_name]

       name = params[:display_name]
       name = params[:display_name]

-      new_friend = User.find_by_display_name(name, :conditions => {:visible => true})
+      new_friend = User.find_by_display_name(name, :conditions => {:status => ["active", "confirmed"]})

       friend = Friend.new
       friend.user_id = @user.id
       friend.friend_user_id = new_friend.id
       friend = Friend.new
       friend.user_id = @user.id
       friend.friend_user_id = new_friend.id


@@ -280,25 +326,252 @@ class UserController < ApplicationController
           friend.add_error(t('user.make_friend.failed', :name => name))
         end
       else
           friend.add_error(t('user.make_friend.failed', :name => name))
         end
       else

-        flash[:notice] = t 'user.make_friend.already_a_friend', :name => name
+        flash[:warning] = t 'user.make_friend.already_a_friend', :name => name

       end
 
       end
 

-      redirect_to :controller => 'user', :action => 'view'
+      if params[:referer]
+        redirect_to params[:referer]
+      else
+        redirect_to :controller => 'user', :action => 'view'
+      end

     end
   end
 
   def remove_friend
     end
   end
 
   def remove_friend

-    if params[:display_name]     
+    if params[:display_name]

       name = params[:display_name]
       name = params[:display_name]

-      friend = User.find_by_display_name(name, :conditions => {:visible => true})
+      friend = User.find_by_display_name(name, :conditions => {:status => ["active", "confirmed"]})

       if @user.is_friends_with?(friend)
         Friend.delete_all "user_id = #{@user.id} AND friend_user_id = #{friend.id}"
         flash[:notice] = t 'user.remove_friend.success', :name => friend.display_name
       else
       if @user.is_friends_with?(friend)
         Friend.delete_all "user_id = #{@user.id} AND friend_user_id = #{friend.id}"
         flash[:notice] = t 'user.remove_friend.success', :name => friend.display_name
       else

-        flash[:notice] = t 'user.remove_friend.not_a_friend', :name => friend.display_name
+        flash[:error] = t 'user.remove_friend.not_a_friend', :name => friend.display_name

       end
 
       end
 

-      redirect_to :controller => 'user', :action => 'view'
+      if params[:referer]
+        redirect_to params[:referer]
+      else
+        redirect_to :controller => 'user', :action => 'view'
+      end
+    end
+  end
+
+  ##
+  # sets a user's status
+  def set_status
+    @this_user.update_attributes(:status => params[:status])
+    redirect_to :controller => 'user', :action => 'view', :display_name => params[:display_name]
+  end
+
+  ##
+  # delete a user, marking them as deleted and removing personal data
+  def delete
+    @this_user.delete
+    redirect_to :controller => 'user', :action => 'view', :display_name => params[:display_name]
+  end
+
+  ##
+  # display a list of users matching specified criteria
+  def list
+    if request.post?
+      ids = params[:user].keys.collect { |id| id.to_i }
+
+      User.update_all("status = 'confirmed'", :id => ids) if params[:confirm]
+      User.update_all("status = 'deleted'", :id => ids) if params[:hide]
+
+      redirect_to url_for(:status => params[:status], :ip => params[:ip], :page => params[:page])
+    else
+      conditions = Hash.new
+      conditions[:status] = params[:status] if params[:status]
+      conditions[:creation_ip] = params[:ip] if params[:ip]
+
+      @user_pages, @users = paginate(:users,
+                                     :conditions => conditions,
+                                     :order => :id,
+                                     :per_page => 50)
+    end
+  end
+
+private
+
+  ##
+  # handle password authentication
+  def password_authentication(username, password)
+    if user = User.authenticate(:username => username, :password => password)
+      successful_login(user)
+    elsif User.authenticate(:username => username, :password => password, :pending => true)
+      failed_login t('user.login.account not active')
+    elsif User.authenticate(:username => username, :password => password, :suspended => true)
+      webmaster = link_to t('user.login.webmaster'), "mailto:webmaster@openstreetmap.org"
+      failed_login t('user.login.account suspended', :webmaster => webmaster)
+    else
+      failed_login t('user.login.auth failure')

     end
   end
     end
   end

+
+  ##
+  # handle OpenID authentication
+  def openid_authentication(openid_url)
+    # If we don't appear to have a user for this URL then ask the
+    # provider for some extra information to help with signup
+    if openid_url and User.find_by_openid_url(openid_url)
+      optional = nil
+    else
+      optional = [:nickname, :email]
+    end
+
+    # Start the authentication
+    authenticate_with_open_id(openid_expand_url(openid_url), :optional => optional) do |result, identity_url, registration|
+      if result.successful?
+        # We need to use the openid url passed back from the OpenID provider
+        # rather than the one supplied by the user, as these can be different.
+        #
+        # For example, you can simply enter yahoo.com in the login box rather
+        # than a user specific url. Only once it comes back from the provider
+        # provider do we know the unique address for the user.
+        if user = User.find_by_openid_url(identity_url)
+          case user.status
+            when "pending" then
+              failed_login t('user.login.account not active')
+            when "active", "confirmed" then
+              successful_login(user)
+            when "suspended" then
+              webmaster = link_to t('user.login.webmaster'), "mailto:webmaster@openstreetmap.org"
+              failed_login t('user.login.account suspended', :webmaster => webmaster)
+            else
+              failed_login t('user.login.auth failure')
+          end
+        else
+          # We don't have a user registered to this OpenID, so redirect
+          # to the create account page with username and email filled
+          # in if they have been given by the OpenID provider through
+          # the simple registration protocol.
+          redirect_to :controller => 'user', :action => 'new', :nickname => registration['nickname'], :email => registration['email'], :openid => identity_url
+        end
+      elsif result.missing?
+        failed_login t('user.login.openid missing provider')
+      elsif result.invalid?
+        failed_login t('user.login.openid invalid')
+      else
+        failed_login t('user.login.auth failure')
+      end
+    end
+  end
+
+  ##
+  # verify an OpenID URL
+  def openid_verify(openid_url, user)
+    user.openid_url = openid_url
+
+    authenticate_with_open_id(openid_expand_url(openid_url)) do |result, identity_url|
+      if result.successful?
+        # We need to use the openid url passed back from the OpenID provider
+        # rather than the one supplied by the user, as these can be different.
+        #
+        # For example, you can simply enter yahoo.com in the login box rather
+        # than a user specific url. Only once it comes back from the provider
+        # provider do we know the unique address for the user.
+        user.openid_url = identity_url
+        yield user
+      elsif result.missing?
+        flash.now[:error] = t 'user.login.openid missing provider'
+      elsif result.invalid?
+        flash.now[:error] = t 'user.login.openid invalid'
+      else
+        flash.now[:error] = t 'user.login.auth failure'
+      end
+    end
+  end
+
+  ##
+  # special case some common OpenID providers by applying heuristics to
+  # try and come up with the correct URL based on what the user entered
+  def openid_expand_url(openid_url)
+    if openid_url.nil?
+      return nil
+    elsif openid_url.match(/(.*)gmail.com(\/?)$/) or openid_url.match(/(.*)googlemail.com(\/?)$/)
+      # Special case gmail.com as it is potentially a popular OpenID
+      # provider and, unlike yahoo.com, where it works automatically, Google
+      # have hidden their OpenID endpoint somewhere obscure this making it
+      # somewhat less user friendly.
+      return 'https://www.google.com/accounts/o8/id'
+    else
+      return openid_url
+    end
+  end  
+
+  ##
+  # process a successful login
+  def successful_login(user)
+    session[:user] = user.id
+
+    session_expires_after 1.month if session[:remember_me]
+
+    if user.blocked_on_view
+      redirect_to user.blocked_on_view, :referer => params[:referer]
+    elsif session[:referer]
+      redirect_to session[:referer]
+    else
+      redirect_to :controller => 'site', :action => 'index'
+    end
+
+    session.delete(:remember_me)
+    session.delete(:referer)
+  end
+
+  ##
+  # process a failed login
+  def failed_login(message)
+    flash[:error] = message
+
+    redirect_to :action => 'login', :referer =>  session[:referer]
+
+    session.delete(:remember_me)
+    session.delete(:referer)
+  end
+
+  ##
+  # update a user's details
+  def update_user(user)
+    if user.save
+      set_locale
+
+      if user.new_email.nil? or user.new_email.empty?
+        flash.now[:notice] = t 'user.account.flash update success'
+      else
+        flash.now[:notice] = t 'user.account.flash update success confirm needed'
+
+        begin
+          Notifier.deliver_email_confirm(user, user.tokens.create)
+        rescue
+          # Ignore errors sending email
+        end
+      end
+    end
+  end
+
+  ##
+  # require that the user is a administrator, or fill out a helpful error message
+  # and return them to the user page.
+  def require_administrator
+    if @user and not @user.administrator?
+      flash[:error] = t('user.filter.not_an_administrator')
+
+      if params[:display_name]
+        redirect_to :controller => 'user', :action => 'view', :display_name => params[:display_name]
+      else
+        redirect_to :controller => 'user', :action => 'login', :referer => request.request_uri
+      end
+    elsif not @user
+      redirect_to :controller => 'user', :action => 'login', :referer => request.request_uri
+    end
+  end
+
+  ##
+  # ensure that there is a "this_user" instance variable
+  def lookup_this_user
+    @this_user = User.find_by_display_name(params[:display_name])
+  rescue ActiveRecord::RecordNotFound
+    redirect_to :controller => 'user', :action => 'view', :display_name => params[:display_name] unless @this_user
+  end

 end
 end