discourse/lib/guardian.rb

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# frozen_string_literal: true
require_dependency 'guardian/category_guardian'
require_dependency 'guardian/ensure_magic'
require_dependency 'guardian/post_guardian'
require_dependency 'guardian/topic_guardian'
require_dependency 'guardian/user_guardian'
require_dependency 'guardian/post_revision_guardian'
require_dependency 'guardian/group_guardian'
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require_dependency 'guardian/tag_guardian'
# The guardian is responsible for confirming access to various site resources and operations
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class Guardian
include EnsureMagic
include CategoryGuardian
include PostGuardian
include TopicGuardian
include UserGuardian
include PostRevisionGuardian
include GroupGuardian
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include TagGuardian
class AnonymousUser
def blank?
true
end
def admin?
false
end
def staff?
false
end
def moderator?
false
end
def anonymous?
true
end
def approved?
false
end
def staged?
false
end
def silenced?
false
end
def secure_category_ids
[]
end
def topic_create_allowed_category_ids
[]
end
def has_trust_level?(level)
false
end
def email
nil
end
end
attr_reader :request
def initialize(user = nil, request = nil)
@user = user.presence || AnonymousUser.new
@request = request
end
def user
@user.presence
end
alias :current_user :user
def anonymous?
!authenticated?
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end
def authenticated?
@user.present?
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end
def is_admin?
@user.admin?
end
def is_staff?
@user.staff?
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end
def is_moderator?
@user.moderator?
end
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def is_silenced?
@user.silenced?
end
def is_developer?
@user &&
is_admin? &&
(
Rails.env.development? ||
Developer.user_ids.include?(@user.id) ||
(
Rails.configuration.respond_to?(:developer_emails) &&
Rails.configuration.developer_emails.include?(@user.email)
)
)
end
def is_staged?
@user.staged?
end
def is_anonymous?
@user.anonymous?
end
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# Can the user see the object?
def can_see?(obj)
if obj
see_method = method_name_for :see, obj
return (see_method ? public_send(see_method, obj) : true)
end
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end
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def can_create?(klass, parent = nil)
return false unless authenticated? && klass
# If no parent is provided, we look for a can_create_klass?
# custom method.
#
# If a parent is provided, we look for a method called
# can_create_klass_on_parent?
target = klass.name.underscore
if parent.present?
return false unless can_see?(parent)
target << "_on_#{parent.class.name.underscore}"
end
create_method = :"can_create_#{target}?"
return public_send(create_method, parent) if respond_to?(create_method)
true
end
def can_enable_safe_mode?
SiteSetting.enable_safe_mode? || is_staff?
end
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# Can the user edit the obj
def can_edit?(obj)
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can_do?(:edit, obj)
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end
# Can we delete the object
def can_delete?(obj)
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can_do?(:delete, obj)
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end
def can_moderate?(obj)
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obj && authenticated? && !is_silenced? && (is_staff? || (obj.is_a?(Topic) && @user.has_trust_level?(TrustLevel[4])))
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end
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alias :can_move_posts? :can_moderate?
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alias :can_see_flags? :can_moderate?
alias :can_close? :can_moderate?
def can_tag?(topic)
return false if topic.blank?
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topic.private_message? ? can_tag_pms? : can_tag_topics?
end
def can_see_tags?(topic)
SiteSetting.tagging_enabled && topic.present? && (!topic.private_message? || can_tag_pms?)
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end
def can_send_activation_email?(user)
user && is_staff? && !SiteSetting.must_approve_users?
end
def can_grant_badges?(_user)
SiteSetting.enable_badges && is_staff?
end
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def can_delete_reviewable_queued_post?(reviewable)
reviewable.present? &&
authenticated? &&
reviewable.created_by_id == @user.id
end
def can_see_group?(group)
return false if group.blank?
return true if group.visibility_level == Group.visibility_levels[:public]
return true if is_admin?
return true if is_staff? && group.visibility_level == Group.visibility_levels[:staff]
return true if authenticated? && group.visibility_level == Group.visibility_levels[:logged_on_users]
return false if user.blank?
membership = GroupUser.find_by(group_id: group.id, user_id: user.id)
return false unless membership
if !membership.owner
return false if group.visibility_level == Group.visibility_levels[:owners]
return false if group.visibility_level == Group.visibility_levels[:staff]
end
true
end
def can_see_groups?(groups)
return false if groups.blank?
return true if groups.all? { |g| g.visibility_level == Group.visibility_levels[:public] }
return true if is_admin?
return true if is_staff? && groups.all? { |g| g.visibility_level == Group.visibility_levels[:staff] }
return true if authenticated? && groups.all? { |g| g.visibility_level == Group.visibility_levels[:logged_on_users] }
return false if user.blank?
memberships = GroupUser.where(group: groups, user_id: user.id).pluck(:owner)
return false if memberships.empty? || memberships.length < groups.size
if !memberships.all?
return false if groups.all? { |g| g.visibility_level == Group.visibility_levels[:owners] }
return false if groups.all? { |g| g.visibility_level == Group.visibility_levels[:staff] }
end
true
end
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# Can we impersonate this user?
def can_impersonate?(target)
target &&
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# You must be an admin to impersonate
is_admin? &&
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# You may not impersonate other admins unless you are a dev
(!target.admin? || is_developer?)
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# Additionally, you may not impersonate yourself;
# but the two tests for different admin statuses
# make it impossible to be the same user.
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end
def can_view_action_logs?(target)
target.present? && is_staff?
end
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# Can we approve it?
def can_approve?(target)
is_staff? && target && target.active? && !target.approved?
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end
def can_activate?(target)
is_staff? && target && not(target.active?)
end
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def can_suspend?(user)
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user && is_staff? && user.regular?
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end
alias :can_deactivate? :can_suspend?
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def can_revoke_admin?(admin)
can_administer_user?(admin) && admin.admin?
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end
def can_grant_admin?(user)
can_administer_user?(user) && !user.admin?
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end
def can_revoke_moderation?(moderator)
can_administer?(moderator) && moderator.moderator?
end
def can_grant_moderation?(user)
can_administer?(user) && !user.moderator?
end
def can_grant_title?(user, title = nil)
return true if user && is_staff?
return false if title.nil?
return true if title.empty? # A title set to '(none)' in the UI is an empty string
return false if user != @user
return true if user.badges.where(name: title, allow_title: true).exists?
user.groups.where(title: title).exists?
end
def can_change_primary_group?(user)
user && is_staff?
end
def can_change_trust_level?(user)
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user && is_staff?
end
# Support sites that have to approve users
def can_access_forum?
return true unless SiteSetting.must_approve_users?
return false unless @user
# Staff can't lock themselves out of a site
return true if is_staff?
@user.approved?
end
def can_see_invite_details?(user)
is_me?(user)
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end
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def can_invite_to_forum?(groups = nil)
authenticated? &&
(SiteSetting.max_invites_per_day.to_i > 0 || is_staff?) &&
!SiteSetting.enable_sso &&
SiteSetting.enable_local_logins &&
(
(!SiteSetting.must_approve_users? && @user.has_trust_level?(TrustLevel[2])) ||
is_staff?
) &&
(groups.blank? || is_admin? || groups.all? { |g| can_edit_group?(g) })
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end
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def can_invite_to?(object, groups = nil)
return false unless authenticated?
is_topic = object.is_a?(Topic)
return true if is_admin? && !is_topic
return false if (SiteSetting.max_invites_per_day.to_i == 0 && !is_staff?)
return false unless can_see?(object)
return false if groups.present?
if is_topic
if object.private_message?
return true if is_admin?
return false unless SiteSetting.enable_personal_messages?
return false if object.reached_recipients_limit? && !is_staff?
end
if (category = object.category) && category.read_restricted
if (groups = category.groups&.where(automatic: false))&.any?
return groups.any? { |g| can_edit_group?(g) } ? true : false
else
return false
end
end
end
user.has_trust_level?(TrustLevel[2])
end
def can_invite_via_email?(object)
return false unless can_invite_to?(object)
!SiteSetting.enable_sso && SiteSetting.enable_local_logins && (!SiteSetting.must_approve_users? || is_staff?)
end
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def can_bulk_invite_to_forum?(user)
user.admin?
end
def can_send_multiple_invites?(user)
user.staff?
end
def can_resend_all_invites?(user)
user.staff?
end
def can_rescind_all_invites?(user)
user.staff?
end
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def can_see_private_messages?(user_id)
is_admin? || (authenticated? && @user.id == user_id)
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end
def can_invite_group_to_private_message?(group, topic)
can_see_topic?(topic) &&
can_send_private_message?(group)
end
def can_send_private_message?(target, notify_moderators: false)
is_user = target.is_a?(User)
is_group = target.is_a?(Group)
(is_group || is_user) &&
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# User is authenticated
authenticated? &&
# Have to be a basic level at least
(@user.has_trust_level?(SiteSetting.min_trust_to_send_messages) || notify_moderators) &&
# User disabled private message
(is_staff? || is_group || target.user_option.allow_private_messages) &&
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# PMs are enabled
(is_staff? || SiteSetting.enable_personal_messages || notify_moderators) &&
# Can't send PMs to suspended users
(is_staff? || is_group || !target.suspended?) &&
# Check group messageable level
(is_staff? || is_user || Group.messageable(@user).where(id: target.id).exists?) &&
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# Silenced users can only send PM to staff
(!is_silenced? || target.staff?)
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end
def can_send_private_messages_to_email?
# Staged users must be enabled to create a temporary user.
SiteSetting.enable_staged_users &&
# User is authenticated
authenticated? &&
# User is trusted enough
(is_staff? ||
(
# TODO: 2019 evaluate if we need this flexibility
# perhaps we enable this unconditionally to TL4?
@user.has_trust_level?(SiteSetting.min_trust_to_send_email_messages) &&
SiteSetting.enable_personal_email_messages
)
)
end
def can_export_entity?(entity)
return false unless @user
return true if is_admin?
return entity != 'user_list' if is_moderator?
# Regular users can only export their archives
return false unless entity == "user_archive"
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UserExport.where(user_id: @user.id, created_at: (Time.zone.now.beginning_of_day..Time.zone.now.end_of_day)).count == 0
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end
def can_mute_user?(user_id)
can_mute_users? &&
@user.id != user_id &&
User.where(id: user_id, admin: false, moderator: false).exists?
end
def can_mute_users?
return false if anonymous?
@user.staff? || @user.trust_level >= TrustLevel.levels[:basic]
end
def can_ignore_user?(user_id)
can_ignore_users? && @user.id != user_id && User.where(id: user_id, admin: false, moderator: false).exists?
end
def can_ignore_users?
return false if anonymous?
@user.staff? || @user.trust_level >= TrustLevel.levels[:member]
end
def allow_themes?(theme_ids, include_preview: false)
return true if theme_ids.blank?
if include_preview && is_staff? && (theme_ids - Theme.theme_ids).blank?
return true
end
parent = theme_ids.first
components = theme_ids[1..-1] || []
Theme.user_theme_ids.include?(parent) &&
(components - Theme.components_for(parent)).empty?
end
def auth_token
if cookie = request&.cookies[Auth::DefaultCurrentUserProvider::TOKEN_COOKIE]
UserAuthToken.hash_token(cookie)
end
end
private
def is_my_own?(obj)
unless anonymous?
return obj.user_id == @user.id if obj.respond_to?(:user_id) && obj.user_id && @user.id
return obj.user == @user if obj.respond_to?(:user)
end
false
end
def is_me?(other)
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other && authenticated? && other.is_a?(User) && @user == other
end
def is_not_me?(other)
@user.blank? || !is_me?(other)
end
def can_administer?(obj)
is_admin? && obj.present? && obj.id&.positive?
end
def can_administer_user?(other_user)
can_administer?(other_user) && is_not_me?(other_user)
end
def method_name_for(action, obj)
method_name = :"can_#{action}_#{obj.class.name.underscore}?"
return method_name if respond_to?(method_name)
end
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def can_do?(action, obj)
if obj && authenticated?
action_method = method_name_for action, obj
return (action_method ? public_send(action_method, obj) : true)
else
false
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end
end
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end