app/controllers/user_controller.rb

   1 class UserController < ApplicationController
   2   layout "site", :except => [:api_details]
   3
   4   skip_before_action :verify_authenticity_token, :only => [:api_read, :api_details, :api_gpx_files, :auth_success]
   5   before_action :disable_terms_redirect, :only => [:terms, :save, :logout, :api_details]
   6   before_action :authorize, :only => [:api_details, :api_gpx_files]
   7   before_action :authorize_web, :except => [:api_read, :api_details, :api_gpx_files]
   8   before_action :set_locale, :except => [:api_read, :api_details, :api_gpx_files]
   9   before_action :require_user, :only => [:account, :go_public, :make_friend, :remove_friend]
  10   before_action :require_self, :only => [:account]
  11   before_action :check_database_readable, :except => [:login, :api_read, :api_details, :api_gpx_files]
  12   before_action :check_database_writable, :only => [:new, :account, :confirm, :confirm_email, :lost_password, :reset_password, :go_public, :make_friend, :remove_friend]
  13   before_action :check_api_readable, :only => [:api_read, :api_details, :api_gpx_files]
  14   before_action :require_allow_read_prefs, :only => [:api_details]
  15   before_action :require_allow_read_gpx, :only => [:api_gpx_files]
  16   before_action :require_cookies, :only => [:new, :login, :confirm]
  17   before_action :require_administrator, :only => [:set_status, :delete, :list]
  18   around_action :api_call_handle_error, :only => [:api_read, :api_details, :api_gpx_files]
  19   before_action :lookup_user_by_id, :only => [:api_read]
  20   before_action :lookup_user_by_name, :only => [:set_status, :delete]
  21   before_action :allow_thirdparty_images, :only => [:view, :account]
  22
  23   def terms
  24     @legale = params[:legale] || OSM.ip_to_country(request.remote_ip) || DEFAULT_LEGALE
  25     @text = OSM.legal_text_for_country(@legale)
  26
  27     if request.xhr?
  28       render :partial => "terms"
  29     else
  30       @title = t "user.terms.title"
  31
  32       if current_user && current_user.terms_agreed?
  33         # Already agreed to terms, so just show settings
  34         redirect_to :action => :account, :display_name => current_user.display_name
  35       elsif current_user.nil? && session[:new_user].nil?
  36         redirect_to :action => :login, :referer => request.fullpath
  37       end
  38     end
  39   end
  40
  41   def save
  42     @title = t "user.new.title"
  43
  44     if params[:decline]
  45       if current_user
  46         current_user.terms_seen = true
  47
  48         flash[:notice] = t("user.new.terms declined", :url => t("user.new.terms declined url")).html_safe if current_user.save
  49
  50         if params[:referer]
  51           redirect_to params[:referer]
  52         else
  53           redirect_to :action => :account, :display_name => current_user.display_name
  54         end
  55       else
  56         redirect_to t("user.terms.declined")
  57       end
  58     elsif current_user
  59       unless current_user.terms_agreed?
  60         current_user.consider_pd = params[:user][:consider_pd]
  61         current_user.terms_agreed = Time.now.getutc
  62         current_user.terms_seen = true
  63
  64         flash[:notice] = t "user.new.terms accepted" if current_user.save
  65       end
  66
  67       if params[:referer]
  68         redirect_to params[:referer]
  69       else
  70         redirect_to :action => :account, :display_name => current_user.display_name
  71       end
  72     else
  73       self.current_user = session.delete(:new_user)
  74
  75       if check_signup_allowed(current_user.email)
  76         current_user.data_public = true
  77         current_user.description = "" if current_user.description.nil?
  78         current_user.creation_ip = request.remote_ip
  79         current_user.languages = http_accept_language.user_preferred_languages
  80         current_user.terms_agreed = Time.now.getutc
  81         current_user.terms_seen = true
  82
  83         if current_user.auth_uid.blank?
  84           current_user.auth_provider = nil
  85           current_user.auth_uid = nil
  86         end
  87
  88         if current_user.save
  89           flash[:piwik_goal] = PIWIK["goals"]["signup"] if defined?(PIWIK)
  90
  91           referer = welcome_path
  92
  93           begin
  94             uri = URI(session[:referer])
  95             %r{map=(.*)/(.*)/(.*)}.match(uri.fragment) do |m|
  96               editor = Rack::Utils.parse_query(uri.query).slice("editor")
  97               referer = welcome_path({ "zoom" => m[1],
  98                                        "lat" => m[2],
  99                                        "lon" => m[3] }.merge(editor))
 100             end
 101           rescue StandardError
 102             # Use default
 103           end
 104
 105           if current_user.status == "active"
 106             session[:referer] = referer
 107             successful_login(current_user)
 108           else
 109             session[:token] = current_user.tokens.create.token
 110             Notifier.signup_confirm(current_user, current_user.tokens.create(:referer => referer)).deliver_now
 111             redirect_to :action => "confirm", :display_name => current_user.display_name
 112           end
 113         else
 114           render :action => "new", :referer => params[:referer]
 115         end
 116       end
 117     end
 118   end
 119
 120   def account
 121     @tokens = current_user.oauth_tokens.authorized
 122
 123     if params[:user] && params[:user][:display_name] && params[:user][:description]
 124       if params[:user][:auth_provider].blank? ||
 125          (params[:user][:auth_provider] == current_user.auth_provider &&
 126           params[:user][:auth_uid] == current_user.auth_uid)
 127         update_user(current_user, params)
 128       else
 129         session[:new_user_settings] = params
 130         redirect_to auth_url(params[:user][:auth_provider], params[:user][:auth_uid])
 131       end
 132     elsif errors = session.delete(:user_errors)
 133       errors.each do |attribute, error|
 134         current_user.errors.add(attribute, error)
 135       end
 136     end
 137     @title = t "user.account.title"
 138   end
 139
 140   def go_public
 141     current_user.data_public = true
 142     current_user.save
 143     flash[:notice] = t "user.go_public.flash success"
 144     redirect_to :action => "account", :display_name => current_user.display_name
 145   end
 146
 147   def lost_password
 148     @title = t "user.lost_password.title"
 149
 150     if params[:user] && params[:user][:email]
 151       user = User.visible.find_by(:email => params[:user][:email])
 152
 153       if user.nil?
 154         users = User.visible.where("LOWER(email) = LOWER(?)", params[:user][:email])
 155
 156         user = users.first if users.count == 1
 157       end
 158
 159       if user
 160         token = user.tokens.create
 161         Notifier.lost_password(user, token).deliver_now
 162         flash[:notice] = t "user.lost_password.notice email on way"
 163         redirect_to :action => "login"
 164       else
 165         flash.now[:error] = t "user.lost_password.notice email cannot find"
 166       end
 167     end
 168   end
 169
 170   def reset_password
 171     @title = t "user.reset_password.title"
 172
 173     if params[:token]
 174       token = UserToken.find_by(:token => params[:token])
 175
 176       if token
 177         self.current_user = token.user
 178
 179         if params[:user]
 180           current_user.pass_crypt = params[:user][:pass_crypt]
 181           current_user.pass_crypt_confirmation = params[:user][:pass_crypt_confirmation]
 182           current_user.status = "active" if current_user.status == "pending"
 183           current_user.email_valid = true
 184
 185           if current_user.save
 186             token.destroy
 187             flash[:notice] = t "user.reset_password.flash changed"
 188             successful_login(current_user)
 189           end
 190         end
 191       else
 192         flash[:error] = t "user.reset_password.flash token bad"
 193         redirect_to :action => "lost_password"
 194       end
 195     else
 196       head :bad_request
 197     end
 198   end
 199
 200   def new
 201     @title = t "user.new.title"
 202     @referer = params[:referer] || session[:referer]
 203
 204     append_content_security_policy_directives(
 205       :form_action => %w[accounts.google.com *.facebook.com login.live.com github.com meta.wikimedia.org]
 206     )
 207
 208     if current_user
 209       # The user is logged in already, so don't show them the signup
 210       # page, instead send them to the home page
 211       if @referer
 212         redirect_to @referer
 213       else
 214         redirect_to :controller => "site", :action => "index"
 215       end
 216     elsif params.key?(:auth_provider) && params.key?(:auth_uid)
 217       self.current_user = User.new(:email => params[:email],
 218                                    :email_confirmation => params[:email],
 219                                    :display_name => params[:nickname],
 220                                    :auth_provider => params[:auth_provider],
 221                                    :auth_uid => params[:auth_uid])
 222
 223       flash.now[:notice] = render_to_string :partial => "auth_association"
 224     else
 225       check_signup_allowed
 226
 227       self.current_user = User.new
 228     end
 229   end
 230
 231   def create
 232     self.current_user = User.new(user_params)
 233
 234     if check_signup_allowed(current_user.email)
 235       session[:referer] = params[:referer]
 236
 237       current_user.status = "pending"
 238
 239       if current_user.auth_provider.present? && current_user.pass_crypt.empty?
 240         # We are creating an account with external authentication and
 241         # no password was specified so create a random one
 242         current_user.pass_crypt = SecureRandom.base64(16)
 243         current_user.pass_crypt_confirmation = current_user.pass_crypt
 244       end
 245
 246       if current_user.invalid?
 247         # Something is wrong with a new user, so rerender the form
 248         render :action => "new"
 249       elsif current_user.auth_provider.present?
 250         # Verify external authenticator before moving on
 251         session[:new_user] = current_user
 252         redirect_to auth_url(current_user.auth_provider, current_user.auth_uid)
 253       else
 254         # Save the user record
 255         session[:new_user] = current_user
 256         redirect_to :action => :terms
 257       end
 258     end
 259   end
 260
 261   def login
 262     session[:referer] = params[:referer] if params[:referer]
 263
 264     if params[:username].present? && params[:password].present?
 265       session[:remember_me] ||= params[:remember_me]
 266       password_authentication(params[:username], params[:password])
 267     elsif params[:openid_url].present?
 268       session[:remember_me] ||= params[:remember_me_openid]
 269       redirect_to auth_url("openid", params[:openid_url], params[:referer])
 270     end
 271   end
 272
 273   def logout
 274     @title = t "user.logout.title"
 275
 276     if params[:session] == session.id
 277       if session[:token]
 278         token = UserToken.find_by(:token => session[:token])
 279         token.destroy if token
 280         session.delete(:token)
 281       end
 282       session.delete(:user)
 283       session_expires_automatically
 284       if params[:referer]
 285         redirect_to params[:referer]
 286       else
 287         redirect_to :controller => "site", :action => "index"
 288       end
 289     end
 290   end
 291
 292   def confirm
 293     if request.post?
 294       token = UserToken.find_by(:token => params[:confirm_string])
 295       if token && token.user.active?
 296         flash[:error] = t("user.confirm.already active")
 297         redirect_to :action => "login"
 298       elsif !token || token.expired?
 299         flash[:error] = t("user.confirm.unknown token")
 300         redirect_to :action => "confirm"
 301       else
 302         user = token.user
 303         user.status = "active"
 304         user.email_valid = true
 305         flash[:notice] = gravatar_status_message(user) if gravatar_enable(user)
 306         user.save!
 307         referer = token.referer
 308         token.destroy
 309
 310         if session[:token]
 311           token = UserToken.find_by(:token => session[:token])
 312           session.delete(:token)
 313         else
 314           token = nil
 315         end
 316
 317         if token.nil? || token.user != user
 318           flash[:notice] = t("user.confirm.success")
 319           redirect_to :action => :login, :referer => referer
 320         else
 321           token.destroy
 322
 323           session[:user] = user.id
 324
 325           redirect_to referer || welcome_path
 326         end
 327       end
 328     else
 329       user = User.find_by(:display_name => params[:display_name])
 330
 331       redirect_to root_path if user.nil? || user.active?
 332     end
 333   end
 334
 335   def confirm_resend
 336     user = User.find_by(:display_name => params[:display_name])
 337     token = UserToken.find_by(:token => session[:token])
 338
 339     if user.nil? || token.nil? || token.user != user
 340       flash[:error] = t "user.confirm_resend.failure", :name => params[:display_name]
 341     else
 342       Notifier.signup_confirm(user, user.tokens.create).deliver_now
 343       flash[:notice] = t("user.confirm_resend.success", :email => user.email, :sender => SUPPORT_EMAIL).html_safe
 344     end
 345
 346     redirect_to :action => "login"
 347   end
 348
 349   def confirm_email
 350     if request.post?
 351       token = UserToken.find_by(:token => params[:confirm_string])
 352       if token && token.user.new_email?
 353         self.current_user = token.user
 354         current_user.email = current_user.new_email
 355         current_user.new_email = nil
 356         current_user.email_valid = true
 357         gravatar_enabled = gravatar_enable(current_user)
 358         if current_user.save
 359           flash[:notice] = if gravatar_enabled
 360                              t("user.confirm_email.success") + " " + gravatar_status_message(current_user)
 361                            else
 362                              t("user.confirm_email.success")
 363                            end
 364         else
 365           flash[:errors] = current_user.errors
 366         end
 367         token.destroy
 368         session[:user] = current_user.id
 369         redirect_to :action => "account", :display_name => current_user.display_name
 370       elsif token
 371         flash[:error] = t "user.confirm_email.failure"
 372         redirect_to :action => "account", :display_name => token.user.display_name
 373       else
 374         flash[:error] = t "user.confirm_email.unknown_token"
 375       end
 376     end
 377   end
 378
 379   def api_read
 380     if @user.visible?
 381       render :action => :api_read, :content_type => "text/xml"
 382     else
 383       head :gone
 384     end
 385   end
 386
 387   def api_details
 388     @user = current_user
 389     render :action => :api_read, :content_type => "text/xml"
 390   end
 391
 392   def api_gpx_files
 393     doc = OSM::API.new.get_xml_doc
 394     current_user.traces.reload.each do |trace|
 395       doc.root << trace.to_xml_node
 396     end
 397     render :xml => doc.to_s
 398   end
 399
 400   def view
 401     @user = User.find_by(:display_name => params[:display_name])
 402
 403     if @user &&
 404        (@user.visible? || (current_user && current_user.administrator?))
 405       @title = @user.display_name
 406     else
 407       render_unknown_user params[:display_name]
 408     end
 409   end
 410
 411   def make_friend
 412     @new_friend = User.find_by(:display_name => params[:display_name])
 413
 414     if @new_friend
 415       if request.post?
 416         friend = Friend.new
 417         friend.befriender = current_user
 418         friend.befriendee = @new_friend
 419         if current_user.is_friends_with?(@new_friend)
 420           flash[:warning] = t "user.make_friend.already_a_friend", :name => @new_friend.display_name
 421         elsif friend.save
 422           flash[:notice] = t "user.make_friend.success", :name => @new_friend.display_name
 423           Notifier.friend_notification(friend).deliver_now
 424         else
 425           friend.add_error(t("user.make_friend.failed", :name => @new_friend.display_name))
 426         end
 427
 428         if params[:referer]
 429           redirect_to params[:referer]
 430         else
 431           redirect_to :action => "view"
 432         end
 433       end
 434     else
 435       render_unknown_user params[:display_name]
 436     end
 437   end
 438
 439   def remove_friend
 440     @friend = User.find_by(:display_name => params[:display_name])
 441
 442     if @friend
 443       if request.post?
 444         if current_user.is_friends_with?(@friend)
 445           Friend.where(:user_id => current_user.id, :friend_user_id => @friend.id).delete_all
 446           flash[:notice] = t "user.remove_friend.success", :name => @friend.display_name
 447         else
 448           flash[:error] = t "user.remove_friend.not_a_friend", :name => @friend.display_name
 449         end
 450
 451         if params[:referer]
 452           redirect_to params[:referer]
 453         else
 454           redirect_to :action => "view"
 455         end
 456       end
 457     else
 458       render_unknown_user params[:display_name]
 459     end
 460   end
 461
 462   ##
 463   # sets a user's status
 464   def set_status
 465     @user.status = params[:status]
 466     @user.save
 467     redirect_to :action => "view", :display_name => params[:display_name]
 468   end
 469
 470   ##
 471   # delete a user, marking them as deleted and removing personal data
 472   def delete
 473     @user.delete
 474     redirect_to :action => "view", :display_name => params[:display_name]
 475   end
 476
 477   ##
 478   # display a list of users matching specified criteria
 479   def list
 480     if request.post?
 481       ids = params[:user].keys.collect(&:to_i)
 482
 483       User.where(:id => ids).update_all(:status => "confirmed") if params[:confirm]
 484       User.where(:id => ids).update_all(:status => "deleted") if params[:hide]
 485
 486       redirect_to url_for(:status => params[:status], :ip => params[:ip], :page => params[:page])
 487     else
 488       @params = params.permit(:status, :ip)
 489
 490       conditions = {}
 491       conditions[:status] = @params[:status] if @params[:status]
 492       conditions[:creation_ip] = @params[:ip] if @params[:ip]
 493
 494       @user_pages, @users = paginate(:users,
 495                                      :conditions => conditions,
 496                                      :order => :id,
 497                                      :per_page => 50)
 498     end
 499   end
 500
 501   ##
 502   # omniauth success callback
 503   def auth_success
 504     auth_info = request.env["omniauth.auth"]
 505
 506     provider = auth_info[:provider]
 507     uid = auth_info[:uid]
 508     name = auth_info[:info][:name]
 509     email = auth_info[:info][:email]
 510
 511     case provider
 512     when "openid"
 513       email_verified = uid.match(%r{https://www.google.com/accounts/o8/id?(.*)}) ||
 514                        uid.match(%r{https://me.yahoo.com/(.*)})
 515     when "google", "facebook"
 516       email_verified = true
 517     else
 518       email_verified = false
 519     end
 520
 521     if settings = session.delete(:new_user_settings)
 522       current_user.auth_provider = provider
 523       current_user.auth_uid = uid
 524
 525       update_user(current_user, settings)
 526
 527       session[:user_errors] = current_user.errors.as_json
 528
 529       redirect_to :action => "account", :display_name => current_user.display_name
 530     elsif session[:new_user]
 531       session[:new_user].auth_provider = provider
 532       session[:new_user].auth_uid = uid
 533
 534       session[:new_user].status = "active" if email_verified && email == session[:new_user].email
 535
 536       redirect_to :action => "terms"
 537     else
 538       user = User.find_by(:auth_provider => provider, :auth_uid => uid)
 539
 540       if user.nil? && provider == "google"
 541         openid_url = auth_info[:extra][:id_info]["openid_id"]
 542         user = User.find_by(:auth_provider => "openid", :auth_uid => openid_url) if openid_url
 543         user.update(:auth_provider => provider, :auth_uid => uid) if user
 544       end
 545
 546       if user
 547         case user.status
 548         when "pending" then
 549           unconfirmed_login(user)
 550         when "active", "confirmed" then
 551           successful_login(user, request.env["omniauth.params"]["referer"])
 552         when "suspended" then
 553           failed_login t("user.login.account is suspended", :webmaster => "mailto:#{SUPPORT_EMAIL}").html_safe
 554         else
 555           failed_login t("user.login.auth failure")
 556         end
 557       else
 558         redirect_to :action => "new", :nickname => name, :email => email,
 559                     :auth_provider => provider, :auth_uid => uid
 560       end
 561     end
 562   end
 563
 564   ##
 565   # omniauth failure callback
 566   def auth_failure
 567     flash[:error] = t("user.auth_failure." + params[:message])
 568     redirect_to params[:origin] || login_url
 569   end
 570
 571   private
 572
 573   ##
 574   # handle password authentication
 575   def password_authentication(username, password)
 576     if user = User.authenticate(:username => username, :password => password)
 577       successful_login(user)
 578     elsif user = User.authenticate(:username => username, :password => password, :pending => true)
 579       unconfirmed_login(user)
 580     elsif User.authenticate(:username => username, :password => password, :suspended => true)
 581       failed_login t("user.login.account is suspended", :webmaster => "mailto:#{SUPPORT_EMAIL}").html_safe, username
 582     else
 583       failed_login t("user.login.auth failure"), username
 584     end
 585   end
 586
 587   ##
 588   # return the URL to use for authentication
 589   def auth_url(provider, uid, referer = nil)
 590     params = { :provider => provider }
 591
 592     params[:openid_url] = openid_expand_url(uid) if provider == "openid"
 593
 594     if referer.nil?
 595       params[:origin] = request.path
 596     else
 597       params[:origin] = request.path + "?referer=" + CGI.escape(referer)
 598       params[:referer] = referer
 599     end
 600
 601     auth_path(params)
 602   end
 603
 604   ##
 605   # special case some common OpenID providers by applying heuristics to
 606   # try and come up with the correct URL based on what the user entered
 607   def openid_expand_url(openid_url)
 608     if openid_url.nil?
 609       nil
 610     elsif openid_url.match(%r{(.*)gmail.com(/?)$}) || openid_url.match(%r{(.*)googlemail.com(/?)$})
 611       # Special case gmail.com as it is potentially a popular OpenID
 612       # provider and, unlike yahoo.com, where it works automatically, Google
 613       # have hidden their OpenID endpoint somewhere obscure this making it
 614       # somewhat less user friendly.
 615       "https://www.google.com/accounts/o8/id"
 616     else
 617       openid_url
 618     end
 619   end
 620
 621   ##
 622   # process a successful login
 623   def successful_login(user, referer = nil)
 624     session[:user] = user.id
 625     session_expires_after 28.days if session[:remember_me]
 626
 627     target = referer || session[:referer] || url_for(:controller => :site, :action => :index)
 628
 629     # The user is logged in, so decide where to send them:
 630     #
 631     # - If they haven't seen the contributor terms, send them there.
 632     # - If they have a block on them, show them that.
 633     # - If they were referred to the login, send them back there.
 634     # - Otherwise, send them to the home page.
 635     if REQUIRE_TERMS_SEEN && !user.terms_seen
 636       redirect_to :action => :terms, :referer => target
 637     elsif user.blocked_on_view
 638       redirect_to user.blocked_on_view, :referer => target
 639     else
 640       redirect_to target
 641     end
 642
 643     session.delete(:remember_me)
 644     session.delete(:referer)
 645   end
 646
 647   ##
 648   # process a failed login
 649   def failed_login(message, username = nil)
 650     flash[:error] = message
 651
 652     redirect_to :action => "login", :referer => session[:referer],
 653                 :username => username, :remember_me => session[:remember_me]
 654
 655     session.delete(:remember_me)
 656     session.delete(:referer)
 657   end
 658
 659   ##
 660   #
 661   def unconfirmed_login(user)
 662     session[:token] = user.tokens.create.token
 663
 664     redirect_to :action => "confirm", :display_name => user.display_name
 665
 666     session.delete(:remember_me)
 667     session.delete(:referer)
 668   end
 669
 670   ##
 671   # update a user's details
 672   def update_user(user, params)
 673     user.display_name = params[:user][:display_name]
 674     user.new_email = params[:user][:new_email]
 675
 676     unless params[:user][:pass_crypt].empty? && params[:user][:pass_crypt_confirmation].empty?
 677       user.pass_crypt = params[:user][:pass_crypt]
 678       user.pass_crypt_confirmation = params[:user][:pass_crypt_confirmation]
 679     end
 680
 681     if params[:user][:description] != user.description
 682       user.description = params[:user][:description]
 683       user.description_format = "markdown"
 684     end
 685
 686     user.languages = params[:user][:languages].split(",")
 687
 688     case params[:image_action]
 689     when "new" then
 690       user.image = params[:user][:image]
 691       user.image_use_gravatar = false
 692     when "delete" then
 693       user.image = nil
 694       user.image_use_gravatar = false
 695     when "gravatar" then
 696       user.image = nil
 697       user.image_use_gravatar = true
 698     end
 699
 700     user.home_lat = params[:user][:home_lat]
 701     user.home_lon = params[:user][:home_lon]
 702
 703     user.preferred_editor = if params[:user][:preferred_editor] == "default"
 704                               nil
 705                             else
 706                               params[:user][:preferred_editor]
 707                             end
 708
 709     if params[:user][:auth_provider].nil? || params[:user][:auth_provider].blank?
 710       user.auth_provider = nil
 711       user.auth_uid = nil
 712     end
 713
 714     if user.save
 715       set_locale(true)
 716
 717       if user.new_email.blank? || user.new_email == user.email
 718         flash.now[:notice] = t "user.account.flash update success"
 719       else
 720         user.email = user.new_email
 721
 722         if user.valid?
 723           flash.now[:notice] = t "user.account.flash update success confirm needed"
 724
 725           begin
 726             Notifier.email_confirm(user, user.tokens.create).deliver_now
 727           rescue StandardError
 728             # Ignore errors sending email
 729           end
 730         else
 731           current_user.errors.add(:new_email, current_user.errors[:email])
 732           current_user.errors.add(:email, [])
 733         end
 734
 735         user.restore_email!
 736       end
 737     end
 738   end
 739
 740   ##
 741   # require that the user is a administrator, or fill out a helpful error message
 742   # and return them to the user page.
 743   def require_administrator
 744     if current_user && !current_user.administrator?
 745       flash[:error] = t("user.filter.not_an_administrator")
 746
 747       if params[:display_name]
 748         redirect_to :action => "view", :display_name => params[:display_name]
 749       else
 750         redirect_to :action => "login", :referer => request.fullpath
 751       end
 752     elsif !current_user
 753       redirect_to :action => "login", :referer => request.fullpath
 754     end
 755   end
 756
 757   ##
 758   # require that the user in the URL is the logged in user
 759   def require_self
 760     head :forbidden if params[:display_name] != current_user.display_name
 761   end
 762
 763   ##
 764   # ensure that there is a "user" instance variable
 765   def lookup_user_by_id
 766     @user = User.find(params[:id])
 767   end
 768
 769   ##
 770   # ensure that there is a "user" instance variable
 771   def lookup_user_by_name
 772     @user = User.find_by(:display_name => params[:display_name])
 773   rescue ActiveRecord::RecordNotFound
 774     redirect_to :action => "view", :display_name => params[:display_name] unless @user
 775   end
 776
 777   ##
 778   #
 779   def disable_terms_redirect
 780     # this is necessary otherwise going to the user terms page, when
 781     # having not agreed already would cause an infinite redirect loop.
 782     # it's .now so that this doesn't propagate to other pages.
 783     flash.now[:skip_terms] = true
 784   end
 785
 786   ##
 787   # return permitted user parameters
 788   def user_params
 789     params.require(:user).permit(:email, :email_confirmation, :display_name,
 790                                  :auth_provider, :auth_uid,
 791                                  :pass_crypt, :pass_crypt_confirmation)
 792   end
 793
 794   ##
 795   # check signup acls
 796   def check_signup_allowed(email = nil)
 797     domain = if email.nil?
 798                nil
 799              else
 800                email.split("@").last
 801              end
 802
 803     if blocked = Acl.no_account_creation(request.remote_ip, domain)
 804       logger.info "Blocked signup from #{request.remote_ip} for #{email}"
 805
 806       render :action => "blocked"
 807     end
 808
 809     !blocked
 810   end
 811
 812   ##
 813   # check if this user has a gravatar and set the user pref is true
 814   def gravatar_enable(user)
 815     # code from example https://en.gravatar.com/site/implement/images/ruby/
 816     return false if user.image.present?
 817     hash = Digest::MD5.hexdigest(user.email.downcase)
 818     url = "https://www.gravatar.com/avatar/#{hash}?d=404" # without d=404 we will always get an image back
 819     response = OSM.http_client.get(URI.parse(url))
 820     oldsetting = user.image_use_gravatar
 821     user.image_use_gravatar = response.success?
 822     oldsetting != user.image_use_gravatar
 823   end
 824
 825   ##
 826   # display a message about th current status of the gravatar setting
 827   def gravatar_status_message(user)
 828     if user.image_use_gravatar
 829       t "user.account.gravatar.enabled"
 830     else
 831       t "user.account.gravatar.disabled"
 832     end
 833   end
 834 end