app/controllers/users_controller.rb

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