428 lines
11 KiB
Ruby
428 lines
11 KiB
Ruby
# The guardian is responsible for confirming access to various site resources and operations
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class Guardian
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class AnonymousUser
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def blank?; true; end
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def admin?; false; end
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def staff?; false; end
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def approved?; false; end
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def secure_category_ids; []; end
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def topic_create_allowed_category_ids; []; end
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def has_trust_level?(level); false; end
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end
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def initialize(user=nil)
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@user = user.presence || AnonymousUser.new
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end
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def user
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@user.presence
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end
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alias :current_user :user
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def anonymous?
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!authenticated?
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end
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def authenticated?
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@user.present?
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end
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def is_admin?
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@user.admin?
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end
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def is_staff?
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@user.staff?
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end
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# Can the user see the object?
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def can_see?(obj)
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if obj
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see_method = method_name_for :see, obj
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return (see_method ? send(see_method, obj) : true)
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end
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end
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# Can the user edit the obj
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def can_edit?(obj)
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if obj && authenticated?
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edit_method = method_name_for :edit, obj
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return (edit_method ? send(edit_method, obj) : true)
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end
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end
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# Can we delete the object
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def can_delete?(obj)
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if obj && authenticated?
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delete_method = method_name_for :delete, obj
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return (delete_method ? send(delete_method, obj) : true)
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end
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end
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def can_moderate?(obj)
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obj && is_staff?
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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?
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alias :can_send_activation_email? :can_moderate?
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# Can the user create a topic in the forum
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def can_create?(klass, parent=nil)
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return false unless authenticated? && klass
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# If no parent is provided, we look for a can_i_create_klass?
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# custom method.
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#
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# If a parent is provided, we look for a method called
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# can_i_create_klass_on_parent?
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target = klass.name.underscore
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if parent.present?
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return false unless can_see?(parent)
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target << "_on_#{parent.class.name.underscore}"
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end
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create_method = :"can_create_#{target}?"
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return send(create_method, parent) if respond_to?(create_method)
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true
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end
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# Can we impersonate this user?
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def can_impersonate?(target)
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target &&
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# You must be an admin to impersonate
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is_admin? &&
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# You may not impersonate other admins
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not(target.admin?)
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# Additionally, you may not impersonate yourself;
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# but the two tests for different admin statuses
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# make it impossible to be the same user.
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end
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# Can we approve it?
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def can_approve?(target)
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is_staff? && target && not(target.approved?)
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end
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alias :can_activate? :can_approve?
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def can_ban?(user)
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user && is_staff? && user.regular?
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end
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alias :can_deactivate? :can_ban?
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def can_clear_flags?(post)
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is_staff? && post
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end
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def can_revoke_admin?(admin)
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can_administer_user?(admin) && admin.admin?
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end
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def can_grant_admin?(user)
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can_administer_user?(user) && not(user.admin?)
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end
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def can_revoke_moderation?(moderator)
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can_administer?(moderator) && moderator.moderator?
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end
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def can_grant_moderation?(user)
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can_administer?(user) && not(user.moderator?)
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end
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def can_grant_title?(user)
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user && is_staff?
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end
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def can_change_trust_level?(user)
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user && is_staff?
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end
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def can_block_user?(user)
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user && is_staff? && not(user.staff?)
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end
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def can_unblock_user?(user)
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user && is_staff?
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end
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def can_delete_user?(user)
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user && is_staff? && !user.admin? && user.created_at > SiteSetting.delete_user_max_age.to_i.days.ago
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end
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# Can we see who acted on a post in a particular way?
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def can_see_post_actors?(topic, post_action_type_id)
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return false unless topic
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type_symbol = PostActionType.types[post_action_type_id]
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return false if type_symbol == :bookmark
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return can_see_flags?(topic) if PostActionType.is_flag?(type_symbol)
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if type_symbol == :vote
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# We can see votes if the topic allows for public voting
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return false if topic.has_meta_data_boolean?(:private_poll)
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end
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true
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end
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# Support sites that have to approve users
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def can_access_forum?
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return true unless SiteSetting.must_approve_users?
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return false unless @user
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# Staff can't lock themselves out of a site
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return true if is_staff?
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@user.approved?
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end
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def can_see_pending_invites_from?(user)
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is_me?(user)
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end
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def can_invite_to?(object)
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authenticated? &&
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can_see?(object) &&
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(
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(!SiteSetting.must_approve_users? && @user.has_trust_level?(:regular)) ||
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is_staff?
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)
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end
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def can_see_deleted_posts?
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is_staff?
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end
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def can_see_private_messages?(user_id)
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is_staff? || (authenticated? && @user.id == user_id)
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end
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def can_delete_all_posts?(user)
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is_staff? && user && !user.admin? && user.created_at >= 7.days.ago && user.post_count <= SiteSetting.delete_all_posts_max.to_i
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end
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def can_remove_allowed_users?(topic)
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is_staff?
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end
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# Support for ensure_{blah}! methods.
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def method_missing(method, *args, &block)
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if method.to_s =~ /^ensure_(.*)\!$/
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can_method = :"#{Regexp.last_match[1]}?"
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if respond_to?(can_method)
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raise Discourse::InvalidAccess.new("#{can_method} failed") unless send(can_method, *args, &block)
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return
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end
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end
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super.method_missing(method, *args, &block)
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end
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# Make sure we can see the object. Will raise a NotFound if it's nil
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def ensure_can_see!(obj)
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raise Discourse::InvalidAccess.new("Can't see #{obj}") unless can_see?(obj)
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end
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# Creating Methods
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def can_create_category?(parent)
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is_staff?
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end
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def can_create_topic?(parent)
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can_create_post?(parent)
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end
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def can_create_topic_on_category?(category)
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can_create_post?(nil) && (
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!category ||
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Category.topic_create_allowed(self).where(:id => category.id).count == 1
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)
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end
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def can_create_post?(parent)
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!SpamRulesEnforcer.block?(@user) && (
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!parent ||
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!parent.category ||
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Category.post_create_allowed(self).where(:id => parent.category.id).count == 1
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)
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end
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def can_create_post_on_topic?(topic)
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# No users can create posts on deleted topics
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return false if topic.trashed?
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is_staff? || (not(topic.closed? || topic.archived? || topic.trashed?) && can_create_post?(topic))
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end
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# Editing Methods
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def can_edit_category?(category)
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is_staff?
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end
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def can_edit_post?(post)
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is_staff? || (!post.topic.archived? && is_my_own?(post) && !post.user_deleted &&!post.deleted_at)
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end
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def can_edit_user?(user)
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is_me?(user) || is_staff?
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end
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def can_edit_topic?(topic)
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!topic.archived && (is_staff? || is_my_own?(topic))
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end
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# Deleting Methods
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def can_delete_post?(post)
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# Can't delete the first post
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return false if post.post_number == 1
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# You can delete your own posts
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return !post.user_deleted? if is_my_own?(post)
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is_staff?
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end
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# Recovery Method
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def can_recover_post?(post)
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is_staff? || (is_my_own?(post) && post.user_deleted && !post.deleted_at)
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end
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def can_recover_topic?(topic)
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is_staff?
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end
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def can_delete_category?(category)
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is_staff? && category.topic_count == 0
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end
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def can_delete_topic?(topic)
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!topic.trashed? &&
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is_staff? &&
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!(Category.exists?(topic_id: topic.id))
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end
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def can_delete_post_action?(post_action)
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# You can only undo your own actions
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is_my_own?(post_action) && not(post_action.is_private_message?) &&
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# Make sure they want to delete it within the window
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post_action.created_at > SiteSetting.post_undo_action_window_mins.minutes.ago
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end
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def can_send_private_message?(target)
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(User === target || Group === target) &&
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authenticated? &&
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# Can't send message to yourself
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is_not_me?(target) &&
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# Have to be a basic level at least
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@user.has_trust_level?(:basic) &&
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SiteSetting.enable_private_messages
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end
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def can_reply_as_new_topic?(topic)
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authenticated? && topic && not(topic.private_message?) && @user.has_trust_level?(:basic)
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end
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def can_see_topic?(topic)
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if topic
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is_staff? ||
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topic.deleted_at.nil? &&
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# not secure, or I can see it
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(not(topic.read_restricted_category?) || can_see_category?(topic.category)) &&
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# not private, or I am allowed (or an admin)
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(not(topic.private_message?) || authenticated? && (topic.all_allowed_users.where(id: @user.id).exists? || is_admin?))
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end
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end
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def can_see_post?(post)
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post.present? && (is_staff? || (!post.deleted_at.present? && can_see_topic?(post.topic)))
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end
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def can_see_category?(category)
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not(category.read_restricted) || secure_category_ids.include?(category.id)
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end
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def can_vote?(post, opts={})
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post_can_act?(post,:vote, opts)
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end
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# Can the user act on the post in a particular way.
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# taken_actions = the list of actions the user has already taken
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def post_can_act?(post, action_key, opts={})
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taken = opts[:taken_actions].try(:keys).to_a
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is_flag = PostActionType.is_flag?(action_key)
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already_taken_this_action = taken.any? && taken.include?(PostActionType.types[action_key])
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already_did_flagging = taken.any? && (taken & PostActionType.flag_types.values).any?
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if authenticated? && post
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# we always allow flagging - NOTE: this does not seem true, see specs. (MVH)
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(is_flag && @user.has_trust_level?(:basic) && not(already_did_flagging)) ||
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# not a flagging action, and haven't done it already
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not(is_flag || already_taken_this_action) &&
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# nothing except flagging on archived posts
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not(post.topic.archived?) &&
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# don't like your own stuff
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not(action_key == :like && is_my_own?(post)) &&
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# no voting more than once on single vote topics
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not(action_key == :vote && opts[:voted_in_topic] && post.topic.has_meta_data_boolean?(:single_vote))
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end
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end
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def secure_category_ids
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@secure_category_ids ||= @user.secure_category_ids
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end
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def topic_create_allowed_category_ids
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@topic_create_allowed_category_ids ||= @user.topic_create_allowed_category_ids
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end
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private
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def is_my_own?(obj)
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@user.present? &&
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(obj.respond_to?(:user) || obj.respond_to?(:user_id)) &&
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(obj.respond_to?(:user) ? obj.user == @user : true) &&
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(obj.respond_to?(:user_id) ? (obj.user_id == @user.id) : true)
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end
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def is_me?(other)
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other && authenticated? && User === other && @user == other
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end
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def is_not_me?(other)
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@user.blank? || !is_me?(other)
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end
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def can_administer?(obj)
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is_admin? && obj.present?
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end
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def can_administer_user?(other_user)
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can_administer?(other_user) && is_not_me?(other_user)
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end
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def method_name_for(action, obj)
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method_name = :"can_#{action}_#{obj.class.name.underscore}?"
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return method_name if respond_to?(method_name)
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end
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end
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