19206: Avoids disabling or setting system root user as non-admin.
[arvados.git] / services / api / app / models / user.rb
1 # Copyright (C) The Arvados Authors. All rights reserved.
2 #
3 # SPDX-License-Identifier: AGPL-3.0
4
5 require 'can_be_an_owner'
6
7 class User < ArvadosModel
8   include HasUuid
9   include KindAndEtag
10   include CommonApiTemplate
11   include CanBeAnOwner
12   extend CurrentApiClient
13
14   serialize :prefs, Hash
15   has_many :api_client_authorizations
16   validates(:username,
17             format: {
18               with: /\A[A-Za-z][A-Za-z0-9]*\z/,
19               message: "must begin with a letter and contain only alphanumerics",
20             },
21             uniqueness: true,
22             allow_nil: true)
23   validate :must_unsetup_to_deactivate
24   validate :identity_url_nil_if_empty
25   before_update :prevent_privilege_escalation
26   before_update :prevent_inactive_admin
27   before_update :prevent_nonadmin_system_root
28   before_update :verify_repositories_empty, :if => Proc.new {
29     username.nil? and username_changed?
30   }
31   after_update :setup_on_activate
32
33   before_create :check_auto_admin
34   before_create :set_initial_username, :if => Proc.new {
35     username.nil? and email
36   }
37   after_create :after_ownership_change
38   after_create :setup_on_activate
39   after_create :add_system_group_permission_link
40   after_create :auto_setup_new_user, :if => Proc.new {
41     Rails.configuration.Users.AutoSetupNewUsers and
42     (uuid != system_user_uuid) and
43     (uuid != anonymous_user_uuid) and
44     (uuid[0..4] == Rails.configuration.ClusterID)
45   }
46   after_create :send_admin_notifications
47
48   before_update :before_ownership_change
49   after_update :after_ownership_change
50   after_update :send_profile_created_notification
51   after_update :sync_repository_names, :if => Proc.new {
52     (uuid != system_user_uuid) and
53     saved_change_to_username? and
54     (not username_before_last_save.nil?)
55   }
56   before_destroy :clear_permissions
57   after_destroy :remove_self_from_permissions
58
59   has_many :authorized_keys, :foreign_key => :authorized_user_uuid, :primary_key => :uuid
60   has_many :repositories, foreign_key: :owner_uuid, primary_key: :uuid
61
62   default_scope { where('redirect_to_user_uuid is null') }
63
64   api_accessible :user, extend: :common do |t|
65     t.add :email
66     t.add :username
67     t.add :full_name
68     t.add :first_name
69     t.add :last_name
70     t.add :identity_url
71     t.add :is_active
72     t.add :is_admin
73     t.add :is_invited
74     t.add :prefs
75     t.add :writable_by
76     t.add :can_write
77     t.add :can_manage
78   end
79
80   ALL_PERMISSIONS = {read: true, write: true, manage: true}
81
82   # Map numeric permission levels (see lib/create_permission_view.sql)
83   # back to read/write/manage flags.
84   PERMS_FOR_VAL =
85     [{},
86      {read: true},
87      {read: true, write: true},
88      {read: true, write: true, manage: true}]
89
90   VAL_FOR_PERM =
91     {:read => 1,
92      :write => 2,
93      :unfreeze => 3,
94      :manage => 3}
95
96
97   def full_name
98     "#{first_name} #{last_name}".strip
99   end
100
101   def is_invited
102     !!(self.is_active ||
103        Rails.configuration.Users.NewUsersAreActive ||
104        self.groups_i_can(:read).select { |x| x.match(/-f+$/) }.first)
105   end
106
107   def groups_i_can(verb)
108     my_groups = self.group_permissions(VAL_FOR_PERM[verb]).keys
109     if verb == :read
110       my_groups << anonymous_group_uuid
111     end
112     my_groups
113   end
114
115   def can?(actions)
116     actions.each do |action, target|
117       unless target.nil?
118         if target.respond_to? :uuid
119           target_uuid = target.uuid
120         else
121           target_uuid = target
122           target = ArvadosModel.find_by_uuid(target_uuid)
123         end
124       end
125       next if target_uuid == self.uuid
126
127       if action == :write && target && !target.new_record? &&
128          target.respond_to?(:frozen_by_uuid) &&
129          target.frozen_by_uuid_was
130         # Just an optimization to skip the PERMISSION_VIEW and
131         # FrozenGroup queries below
132         return false
133       end
134
135       target_owner_uuid = target.owner_uuid if target.respond_to? :owner_uuid
136
137       user_uuids_subquery = USER_UUIDS_SUBQUERY_TEMPLATE % {user: "$1", perm_level: "$3"}
138
139       if !is_admin && !ActiveRecord::Base.connection.
140         exec_query(%{
141 SELECT 1 FROM #{PERMISSION_VIEW}
142   WHERE user_uuid in (#{user_uuids_subquery}) and
143         ((target_uuid = $2 and perm_level >= $3)
144          or (target_uuid = $4 and perm_level >= $3 and traverse_owned))
145 },
146                   # "name" arg is a query label that appears in logs:
147                    "user_can_query",
148                    [[nil, self.uuid],
149                     [nil, target_uuid],
150                     [nil, VAL_FOR_PERM[action]],
151                     [nil, target_owner_uuid]]
152                   ).any?
153         return false
154       end
155
156       if action == :write
157         if FrozenGroup.where(uuid: [target_uuid, target_owner_uuid]).any?
158           # self or parent is frozen
159           return false
160         end
161       elsif action == :unfreeze
162         # "unfreeze" permission means "can write, but only if
163         # explicitly un-freezing at the same time" (see
164         # ArvadosModel#ensure_owner_uuid_is_permitted). If the
165         # permission query above passed the permission level of
166         # :unfreeze (which is the same as :manage), and the parent
167         # isn't also frozen, then un-freeze is allowed.
168         if FrozenGroup.where(uuid: target_owner_uuid).any?
169           return false
170         end
171       end
172     end
173     true
174   end
175
176   def before_ownership_change
177     if owner_uuid_changed? and !self.owner_uuid_was.nil?
178       MaterializedPermission.where(user_uuid: owner_uuid_was, target_uuid: uuid).delete_all
179       update_permissions self.owner_uuid_was, self.uuid, REVOKE_PERM
180     end
181   end
182
183   def after_ownership_change
184     if saved_change_to_owner_uuid?
185       update_permissions self.owner_uuid, self.uuid, CAN_MANAGE_PERM
186     end
187   end
188
189   def clear_permissions
190     MaterializedPermission.where("user_uuid = ? and target_uuid != ?", uuid, uuid).delete_all
191   end
192
193   def forget_cached_group_perms
194     @group_perms = nil
195   end
196
197   def remove_self_from_permissions
198     MaterializedPermission.where("target_uuid = ?", uuid).delete_all
199     check_permissions_against_full_refresh
200   end
201
202   # Return a hash of {user_uuid: group_perms}
203   #
204   # note: this does not account for permissions that a user gains by
205   # having can_manage on another user.
206   def self.all_group_permissions
207     all_perms = {}
208     ActiveRecord::Base.connection.
209       exec_query(%{
210 SELECT user_uuid, target_uuid, perm_level
211                   FROM #{PERMISSION_VIEW}
212                   WHERE traverse_owned
213 },
214                   # "name" arg is a query label that appears in logs:
215                  "all_group_permissions").
216       rows.each do |user_uuid, group_uuid, max_p_val|
217       all_perms[user_uuid] ||= {}
218       all_perms[user_uuid][group_uuid] = PERMS_FOR_VAL[max_p_val.to_i]
219     end
220     all_perms
221   end
222
223   # Return a hash of {group_uuid: perm_hash} where perm_hash[:read]
224   # and perm_hash[:write] are true if this user can read and write
225   # objects owned by group_uuid.
226   def group_permissions(level=1)
227     @group_perms ||= {}
228     if @group_perms.empty?
229       user_uuids_subquery = USER_UUIDS_SUBQUERY_TEMPLATE % {user: "$1", perm_level: 1}
230
231       ActiveRecord::Base.connection.
232         exec_query(%{
233 SELECT target_uuid, perm_level
234   FROM #{PERMISSION_VIEW}
235   WHERE user_uuid in (#{user_uuids_subquery}) and perm_level >= 1
236 },
237                    # "name" arg is a query label that appears in logs:
238                    "User.group_permissions",
239                    # "binds" arg is an array of [col_id, value] for '$1' vars:
240                    [[nil, uuid]]).
241         rows.each do |group_uuid, max_p_val|
242         @group_perms[group_uuid] = PERMS_FOR_VAL[max_p_val.to_i]
243       end
244     end
245
246     case level
247     when 1
248       @group_perms
249     when 2
250       @group_perms.select {|k,v| v[:write] }
251     when 3
252       @group_perms.select {|k,v| v[:manage] }
253     else
254       raise "level must be 1, 2 or 3"
255     end
256   end
257
258   # create links
259   def setup(repo_name: nil, vm_uuid: nil, send_notification_email: nil)
260     newly_invited = Link.where(tail_uuid: self.uuid,
261                               head_uuid: all_users_group_uuid,
262                               link_class: 'permission',
263                               name: 'can_read').empty?
264
265     # Add can_read link from this user to "all users" which makes this
266     # user "invited", and (depending on config) a link in the opposite
267     # direction which makes this user visible to other users.
268     group_perms = add_to_all_users_group
269
270     # Add git repo
271     repo_perm = if (!repo_name.nil? || Rails.configuration.Users.AutoSetupNewUsersWithRepository) and !username.nil?
272                   repo_name ||= "#{username}/#{username}"
273                   create_user_repo_link repo_name
274                 end
275
276     # Add virtual machine
277     if vm_uuid.nil? and !Rails.configuration.Users.AutoSetupNewUsersWithVmUUID.empty?
278       vm_uuid = Rails.configuration.Users.AutoSetupNewUsersWithVmUUID
279     end
280
281     vm_login_perm = if vm_uuid && username
282                       create_vm_login_permission_link(vm_uuid, username)
283                     end
284
285     # Send welcome email
286     if send_notification_email.nil?
287       send_notification_email = Rails.configuration.Mail.SendUserSetupNotificationEmail
288     end
289
290     if newly_invited and send_notification_email and !Rails.configuration.Users.UserSetupMailText.empty?
291       begin
292         UserNotifier.account_is_setup(self).deliver_now
293       rescue => e
294         logger.warn "Failed to send email to #{self.email}: #{e}"
295       end
296     end
297
298     forget_cached_group_perms
299
300     return [repo_perm, vm_login_perm, *group_perms, self].compact
301   end
302
303   # delete user signatures, login, repo, and vm perms, and mark as inactive
304   def unsetup
305     if self.uuid == system_user_uuid
306       raise "System root user cannot be deactivated"
307     end
308
309     # delete oid_login_perms for this user
310     #
311     # note: these permission links are obsolete, they have no effect
312     # on anything and they are not created for new users.
313     Link.where(tail_uuid: self.email,
314                      link_class: 'permission',
315                      name: 'can_login').destroy_all
316
317     # delete repo_perms for this user
318     Link.where(tail_uuid: self.uuid,
319                      link_class: 'permission',
320                      name: 'can_manage').destroy_all
321
322     # delete vm_login_perms for this user
323     Link.where(tail_uuid: self.uuid,
324                      link_class: 'permission',
325                      name: 'can_login').destroy_all
326
327     # delete "All users" group read permissions for this user
328     Link.where(tail_uuid: self.uuid,
329                      head_uuid: all_users_group_uuid,
330                      link_class: 'permission',
331                      name: 'can_read').destroy_all
332
333     # delete any signatures by this user
334     Link.where(link_class: 'signature',
335                      tail_uuid: self.uuid).destroy_all
336
337     # delete tokens for this user
338     ApiClientAuthorization.where(user_id: self.id).destroy_all
339     # delete ssh keys for this user
340     AuthorizedKey.where(owner_uuid: self.uuid).destroy_all
341     AuthorizedKey.where(authorized_user_uuid: self.uuid).destroy_all
342
343     # delete user preferences (including profile)
344     self.prefs = {}
345
346     # mark the user as inactive
347     self.is_admin = false  # can't be admin and inactive
348     self.is_active = false
349     forget_cached_group_perms
350     self.save!
351   end
352
353   def must_unsetup_to_deactivate
354     if !self.new_record? &&
355        self.uuid[0..4] == Rails.configuration.Login.LoginCluster &&
356        self.uuid[0..4] != Rails.configuration.ClusterID
357       # OK to update our local record to whatever the LoginCluster
358       # reports, because self-activate is not allowed.
359       return
360     elsif self.is_active_changed? &&
361        self.is_active_was &&
362        !self.is_active
363
364       # When a user is set up, they are added to the "All users"
365       # group.  A user that is part of the "All users" group is
366       # allowed to self-activate.
367       #
368       # It doesn't make sense to deactivate a user (set is_active =
369       # false) without first removing them from the "All users" group,
370       # because they would be able to immediately reactivate
371       # themselves.
372       #
373       # The 'unsetup' method removes the user from the "All users"
374       # group (and also sets is_active = false) so send a message
375       # explaining the correct way to deactivate a user.
376       #
377       if Link.where(tail_uuid: self.uuid,
378                     head_uuid: all_users_group_uuid,
379                     link_class: 'permission',
380                     name: 'can_read').any?
381         errors.add :is_active, "cannot be set to false directly, use the 'Deactivate' button on Workbench, or the 'unsetup' API call"
382       end
383     end
384   end
385
386   def set_initial_username(requested: false)
387     if !requested.is_a?(String) || requested.empty?
388       email_parts = email.partition("@")
389       local_parts = email_parts.first.partition("+")
390       if email_parts.any?(&:empty?)
391         return
392       elsif not local_parts.first.empty?
393         requested = local_parts.first
394       else
395         requested = email_parts.first
396       end
397     end
398     requested.sub!(/^[^A-Za-z]+/, "")
399     requested.gsub!(/[^A-Za-z0-9]/, "")
400     unless requested.empty?
401       self.username = find_usable_username_from(requested)
402     end
403   end
404
405   # Move this user's (i.e., self's) owned items to new_owner_uuid and
406   # new_user_uuid (for things normally owned directly by the user).
407   #
408   # If redirect_auth is true, also reassign auth tokens and ssh keys,
409   # and redirect this account to redirect_to_user_uuid, i.e., when a
410   # caller authenticates to this account in the future, the account
411   # redirect_to_user_uuid account will be used instead.
412   #
413   # current_user must have admin privileges, i.e., the caller is
414   # responsible for checking permission to do this.
415   def merge(new_owner_uuid:, new_user_uuid:, redirect_to_new_user:)
416     raise PermissionDeniedError if !current_user.andand.is_admin
417     raise "Missing new_owner_uuid" if !new_owner_uuid
418     raise "Missing new_user_uuid" if !new_user_uuid
419     transaction(requires_new: true) do
420       reload
421       raise "cannot merge an already merged user" if self.redirect_to_user_uuid
422
423       new_user = User.where(uuid: new_user_uuid).first
424       raise "user does not exist" if !new_user
425       raise "cannot merge to an already merged user" if new_user.redirect_to_user_uuid
426
427       self.clear_permissions
428       new_user.clear_permissions
429
430       # If 'self' is a remote user, don't transfer authorizations
431       # (i.e. ability to access the account) to the new user, because
432       # that gives the remote site the ability to access the 'new'
433       # user account that takes over the 'self' account.
434       #
435       # If 'self' is a local user, it is okay to transfer
436       # authorizations, even if the 'new' user is a remote account,
437       # because the remote site does not gain the ability to access an
438       # account it could not before.
439
440       if redirect_to_new_user and self.uuid[0..4] == Rails.configuration.ClusterID
441         # Existing API tokens and ssh keys are updated to authenticate
442         # to the new user.
443         ApiClientAuthorization.
444           where(user_id: id).
445           update_all(user_id: new_user.id)
446
447         user_updates = [
448           [AuthorizedKey, :owner_uuid],
449           [AuthorizedKey, :authorized_user_uuid],
450           [Link, :owner_uuid],
451           [Link, :tail_uuid],
452           [Link, :head_uuid],
453         ]
454       else
455         # Destroy API tokens and ssh keys associated with the old
456         # user.
457         ApiClientAuthorization.where(user_id: id).destroy_all
458         AuthorizedKey.where(owner_uuid: uuid).destroy_all
459         AuthorizedKey.where(authorized_user_uuid: uuid).destroy_all
460         user_updates = [
461           [Link, :owner_uuid],
462           [Link, :tail_uuid]
463         ]
464       end
465
466       # References to the old user UUID in the context of a user ID
467       # (rather than a "home project" in the project hierarchy) are
468       # updated to point to the new user.
469       user_updates.each do |klass, column|
470         klass.where(column => uuid).update_all(column => new_user.uuid)
471       end
472
473       # Need to update repository names to new username
474       if username
475         old_repo_name_re = /^#{Regexp.escape(username)}\//
476         Repository.where(:owner_uuid => uuid).each do |repo|
477           repo.owner_uuid = new_user.uuid
478           repo_name_sub = "#{new_user.username}/"
479           name = repo.name.sub(old_repo_name_re, repo_name_sub)
480           while (conflict = Repository.where(:name => name).first) != nil
481             repo_name_sub += "migrated"
482             name = repo.name.sub(old_repo_name_re, repo_name_sub)
483           end
484           repo.name = name
485           repo.save!
486         end
487       end
488
489       # References to the merged user's "home project" are updated to
490       # point to new_owner_uuid.
491       ActiveRecord::Base.descendants.reject(&:abstract_class?).each do |klass|
492         next if [ApiClientAuthorization,
493                  AuthorizedKey,
494                  Link,
495                  Log,
496                  Repository].include?(klass)
497         next if !klass.columns.collect(&:name).include?('owner_uuid')
498         klass.where(owner_uuid: uuid).update_all(owner_uuid: new_owner_uuid)
499       end
500
501       if redirect_to_new_user
502         update_attributes!(redirect_to_user_uuid: new_user.uuid, username: nil)
503       end
504       skip_check_permissions_against_full_refresh do
505         update_permissions self.uuid, self.uuid, CAN_MANAGE_PERM
506         update_permissions new_user.uuid, new_user.uuid, CAN_MANAGE_PERM
507         update_permissions new_user.owner_uuid, new_user.uuid, CAN_MANAGE_PERM
508       end
509       update_permissions self.owner_uuid, self.uuid, CAN_MANAGE_PERM
510     end
511   end
512
513   def redirects_to
514     user = self
515     redirects = 0
516     while (uuid = user.redirect_to_user_uuid)
517       break if uuid.empty?
518       nextuser = User.unscoped.find_by_uuid(uuid)
519       if !nextuser
520         raise Exception.new("user uuid #{user.uuid} redirects to nonexistent uuid '#{uuid}'")
521       end
522       user = nextuser
523       redirects += 1
524       if redirects > 15
525         raise "Starting from #{self.uuid} redirect_to_user_uuid exceeded maximum number of redirects"
526       end
527     end
528     user
529   end
530
531   def self.register info
532     # login info expected fields, all can be optional but at minimum
533     # must supply either 'identity_url' or 'email'
534     #
535     #   email
536     #   first_name
537     #   last_name
538     #   username
539     #   alternate_emails
540     #   identity_url
541
542     primary_user = nil
543
544     # local database
545     identity_url = info['identity_url']
546
547     if identity_url && identity_url.length > 0
548       # Only local users can create sessions, hence uuid_like_pattern
549       # here.
550       user = User.unscoped.where('identity_url = ? and uuid like ?',
551                                  identity_url,
552                                  User.uuid_like_pattern).first
553       primary_user = user.redirects_to if user
554     end
555
556     if !primary_user
557       # identity url is unset or didn't find matching record.
558       emails = [info['email']] + (info['alternate_emails'] || [])
559       emails.select! {|em| !em.nil? && !em.empty?}
560
561       User.unscoped.where('email in (?) and uuid like ?',
562                           emails,
563                           User.uuid_like_pattern).each do |user|
564         if !primary_user
565           primary_user = user.redirects_to
566         elsif primary_user.uuid != user.redirects_to.uuid
567           raise "Ambiguous email address, directs to both #{primary_user.uuid} and #{user.redirects_to.uuid}"
568         end
569       end
570     end
571
572     if !primary_user
573       # New user registration
574       primary_user = User.new(:owner_uuid => system_user_uuid,
575                               :is_admin => false,
576                               :is_active => Rails.configuration.Users.NewUsersAreActive)
577
578       primary_user.set_initial_username(requested: info['username']) if info['username'] && !info['username'].blank?
579       primary_user.identity_url = info['identity_url'] if identity_url
580     end
581
582     primary_user.email = info['email'] if info['email']
583     primary_user.first_name = info['first_name'] if info['first_name']
584     primary_user.last_name = info['last_name'] if info['last_name']
585
586     if (!primary_user.email or primary_user.email.empty?) and (!primary_user.identity_url or primary_user.identity_url.empty?)
587       raise "Must have supply at least one of 'email' or 'identity_url' to User.register"
588     end
589
590     act_as_system_user do
591       primary_user.save!
592     end
593
594     primary_user
595   end
596
597   protected
598
599   def self.attributes_required_columns
600     super.merge(
601                 'can_write' => ['owner_uuid', 'uuid'],
602                 'can_manage' => ['owner_uuid', 'uuid'],
603                 )
604   end
605
606   def change_all_uuid_refs(old_uuid:, new_uuid:)
607     ActiveRecord::Base.descendants.reject(&:abstract_class?).each do |klass|
608       klass.columns.each do |col|
609         if col.name.end_with?('_uuid')
610           column = col.name.to_sym
611           klass.where(column => old_uuid).update_all(column => new_uuid)
612         end
613       end
614     end
615   end
616
617   def ensure_ownership_path_leads_to_user
618     true
619   end
620
621   def permission_to_update
622     if username_changed? || redirect_to_user_uuid_changed? || email_changed?
623       current_user.andand.is_admin
624     else
625       # users must be able to update themselves (even if they are
626       # inactive) in order to create sessions
627       self == current_user or super
628     end
629   end
630
631   def permission_to_create
632     current_user.andand.is_admin or
633       (self == current_user &&
634        self.redirect_to_user_uuid.nil? &&
635        self.is_active == Rails.configuration.Users.NewUsersAreActive)
636   end
637
638   def check_auto_admin
639     return if self.uuid.end_with?('anonymouspublic')
640     if (User.where("email = ?",self.email).where(:is_admin => true).count == 0 and
641         !Rails.configuration.Users.AutoAdminUserWithEmail.empty? and self.email == Rails.configuration.Users["AutoAdminUserWithEmail"]) or
642        (User.where("uuid not like '%-000000000000000'").where(:is_admin => true).count == 0 and
643         Rails.configuration.Users.AutoAdminFirstUser)
644       self.is_admin = true
645       self.is_active = true
646     end
647   end
648
649   def find_usable_username_from(basename)
650     # If "basename" is a usable username, return that.
651     # Otherwise, find a unique username "basenameN", where N is the
652     # smallest integer greater than 1, and return that.
653     # Return nil if a unique username can't be found after reasonable
654     # searching.
655     quoted_name = self.class.connection.quote_string(basename)
656     next_username = basename
657     next_suffix = 1
658     while Rails.configuration.Users.AutoSetupUsernameBlacklist[next_username]
659       next_suffix += 1
660       next_username = "%s%i" % [basename, next_suffix]
661     end
662     0.upto(6).each do |suffix_len|
663       pattern = "%s%s" % [quoted_name, "_" * suffix_len]
664       self.class.unscoped.
665           where("username like '#{pattern}'").
666           select(:username).
667           order('username asc').
668           each do |other_user|
669         if other_user.username > next_username
670           break
671         elsif other_user.username == next_username
672           next_suffix += 1
673           next_username = "%s%i" % [basename, next_suffix]
674         end
675       end
676       return next_username if (next_username.size <= pattern.size)
677     end
678     nil
679   end
680
681   def prevent_privilege_escalation
682     if current_user.andand.is_admin
683       return true
684     end
685     if self.is_active_changed?
686       if self.is_active != self.is_active_was
687         logger.warn "User #{current_user.uuid} tried to change is_active from #{self.is_active_was} to #{self.is_active} for #{self.uuid}"
688         self.is_active = self.is_active_was
689       end
690     end
691     if self.is_admin_changed?
692       if self.is_admin != self.is_admin_was
693         logger.warn "User #{current_user.uuid} tried to change is_admin from #{self.is_admin_was} to #{self.is_admin} for #{self.uuid}"
694         self.is_admin = self.is_admin_was
695       end
696     end
697     true
698   end
699
700   def prevent_inactive_admin
701     if self.is_admin and not self.is_active
702       # There is no known use case for the strange set of permissions
703       # that would result from this change. It's safest to assume it's
704       # a mistake and disallow it outright.
705       raise "Admin users cannot be inactive"
706     end
707     true
708   end
709
710   def prevent_nonadmin_system_root
711     if self.uuid == system_user_uuid and self.is_admin_changed? and !self.is_admin
712       raise "System root user cannot be non-admin"
713     end
714     true
715   end
716
717   def search_permissions(start, graph, merged={}, upstream_mask=nil, upstream_path={})
718     nextpaths = graph[start]
719     return merged if !nextpaths
720     return merged if upstream_path.has_key? start
721     upstream_path[start] = true
722     upstream_mask ||= ALL_PERMISSIONS
723     nextpaths.each do |head, mask|
724       merged[head] ||= {}
725       mask.each do |k,v|
726         merged[head][k] ||= v if upstream_mask[k]
727       end
728       search_permissions(head, graph, merged, upstream_mask.select { |k,v| v && merged[head][k] }, upstream_path)
729     end
730     upstream_path.delete start
731     merged
732   end
733
734   def create_user_repo_link(repo_name)
735     # repo_name is optional
736     if not repo_name
737       logger.warn ("Repository name not given for #{self.uuid}.")
738       return
739     end
740
741     repo = Repository.where(owner_uuid: uuid, name: repo_name).first_or_create!
742     logger.info { "repo uuid: " + repo[:uuid] }
743     repo_perm = Link.where(tail_uuid: uuid, head_uuid: repo.uuid,
744                            link_class: "permission",
745                            name: "can_manage").first_or_create!
746     logger.info { "repo permission: " + repo_perm[:uuid] }
747     return repo_perm
748   end
749
750   # create login permission for the given vm_uuid, if it does not already exist
751   def create_vm_login_permission_link(vm_uuid, repo_name)
752     # vm uuid is optional
753     return if vm_uuid == ""
754
755     vm = VirtualMachine.where(uuid: vm_uuid).first
756     if !vm
757       logger.warn "Could not find virtual machine for #{vm_uuid.inspect}"
758       raise "No vm found for #{vm_uuid}"
759     end
760
761     logger.info { "vm uuid: " + vm[:uuid] }
762     login_attrs = {
763       tail_uuid: uuid, head_uuid: vm.uuid,
764       link_class: "permission", name: "can_login",
765     }
766
767     login_perm = Link.
768       where(login_attrs).
769       select { |link| link.properties["username"] == repo_name }.
770       first
771
772     login_perm ||= Link.
773       create(login_attrs.merge(properties: {"username" => repo_name}))
774
775     logger.info { "login permission: " + login_perm[:uuid] }
776     login_perm
777   end
778
779   def add_to_all_users_group
780     resp = [Link.where(tail_uuid: self.uuid,
781                        head_uuid: all_users_group_uuid,
782                        link_class: 'permission',
783                        name: 'can_read').first ||
784             Link.create(tail_uuid: self.uuid,
785                         head_uuid: all_users_group_uuid,
786                         link_class: 'permission',
787                         name: 'can_read')]
788     if Rails.configuration.Users.ActivatedUsersAreVisibleToOthers
789       resp += [Link.where(tail_uuid: all_users_group_uuid,
790                           head_uuid: self.uuid,
791                           link_class: 'permission',
792                           name: 'can_read').first ||
793                Link.create(tail_uuid: all_users_group_uuid,
794                            head_uuid: self.uuid,
795                            link_class: 'permission',
796                            name: 'can_read')]
797     end
798     return resp
799   end
800
801   # Give the special "System group" permission to manage this user and
802   # all of this user's stuff.
803   def add_system_group_permission_link
804     return true if uuid == system_user_uuid
805     act_as_system_user do
806       Link.create(link_class: 'permission',
807                   name: 'can_manage',
808                   tail_uuid: system_group_uuid,
809                   head_uuid: self.uuid)
810     end
811   end
812
813   # Send admin notifications
814   def send_admin_notifications
815     AdminNotifier.new_user(self).deliver_now
816     if not self.is_active then
817       AdminNotifier.new_inactive_user(self).deliver_now
818     end
819   end
820
821   # Automatically setup if is_active flag turns on
822   def setup_on_activate
823     return if [system_user_uuid, anonymous_user_uuid].include?(self.uuid)
824     if is_active &&
825       (new_record? || saved_change_to_is_active? || will_save_change_to_is_active?)
826       setup
827     end
828   end
829
830   # Automatically setup new user during creation
831   def auto_setup_new_user
832     setup
833   end
834
835   # Send notification if the user saved profile for the first time
836   def send_profile_created_notification
837     if saved_change_to_prefs?
838       if prefs_before_last_save.andand.empty? || !prefs_before_last_save.andand['profile']
839         profile_notification_address = Rails.configuration.Users.UserProfileNotificationAddress
840         ProfileNotifier.profile_created(self, profile_notification_address).deliver_now if profile_notification_address and !profile_notification_address.empty?
841       end
842     end
843   end
844
845   def verify_repositories_empty
846     unless repositories.first.nil?
847       errors.add(:username, "can't be unset when the user owns repositories")
848       throw(:abort)
849     end
850   end
851
852   def sync_repository_names
853     old_name_re = /^#{Regexp.escape(username_before_last_save)}\//
854     name_sub = "#{username}/"
855     repositories.find_each do |repo|
856       repo.name = repo.name.sub(old_name_re, name_sub)
857       repo.save!
858     end
859   end
860
861   def identity_url_nil_if_empty
862     if identity_url == ""
863       self.identity_url = nil
864     end
865   end
866 end