discourse/lib/guardian.rb

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# The guardian is responsible for confirming access to various site resources and operations
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class Guardian
class AnonymousUser
def blank?; true; end
def admin?; false; end
def staff?; false; end
def approved?; false; end
def secure_category_ids; []; end
def has_trust_level?(level); false; end
end
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def initialize(user=nil)
@user = user.presence || AnonymousUser.new
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
# Can the user see the object?
def can_see?(obj)
if obj
see_method = method_name_for :see, obj
return (see_method ? send(see_method, obj) : true)
end
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end
# Can the user edit the obj
def can_edit?(obj)
if obj && authenticated?
edit_method = method_name_for :edit, obj
return (edit_method ? send(edit_method, obj) : true)
end
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end
# Can we delete the object
def can_delete?(obj)
if obj && authenticated?
delete_method = method_name_for :delete, obj
return (delete_method ? send(delete_method, obj) : true)
end
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end
def can_moderate?(obj)
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?
alias :can_send_activation_email? :can_moderate?
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# Can the user create a topic in the forum
def can_create?(klass, parent=nil)
return false unless authenticated? && klass
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# If no parent is provided, we look for a can_i_create_klass?
# custom method.
#
# If a parent is provided, we look for a method called
# can_i_create_klass_on_parent?
target = klass.name.underscore
if parent.present?
return false unless can_see?(parent)
target << "_on_#{parent.class.name.underscore}"
end
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create_method = :"can_create_#{target}?"
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return send(create_method, parent) if respond_to?(create_method)
true
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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
not(target.admin?)
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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
# Can we approve it?
def can_approve?(target)
is_staff? && target && not(target.approved?)
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end
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
alias :can_deactivate? :can_ban?
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def can_clear_flags?(post)
is_staff? && post
end
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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) && not(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) && not(user.moderator?)
end
def can_block_user?(user)
user && is_staff? && not(user.staff?)
end
def can_unblock_user?(user)
user && is_staff?
end
def can_delete_user?(user_to_delete)
can_administer?(user_to_delete) && user_to_delete.post_count <= 0
end
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# Can we see who acted on a post in a particular way?
def can_see_post_actors?(topic, post_action_type_id)
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
return can_see_flags?(topic) if PostActionType.is_flag?(type_symbol)
if type_symbol == :vote
# We can see votes if the topic allows for public voting
return false if topic.has_meta_data_boolean?(:private_poll)
end
true
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
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def can_see_pending_invites_from?(user)
is_me?(user)
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end
def can_invite_to?(object)
authenticated? &&
can_see?(object) &&
(
(!SiteSetting.must_approve_users? && @user.has_trust_level?(:regular)) ||
is_staff?
)
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end
def can_see_deleted_posts?
is_staff?
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end
def can_see_private_messages?(user_id)
is_staff? || (authenticated? && @user.id == user_id)
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end
def can_delete_all_posts?(user)
is_staff? && user.created_at >= 7.days.ago
end
def can_remove_allowed_users?(topic)
is_staff?
end
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# Support for ensure_{blah}! methods.
def method_missing(method, *args, &block)
if method.to_s =~ /^ensure_(.*)\!$/
can_method = :"#{Regexp.last_match[1]}?"
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
end
end
super.method_missing(method, *args, &block)
end
# Make sure we can see the object. Will raise a NotFound if it's nil
def ensure_can_see!(obj)
raise Discourse::InvalidAccess.new("Can't see #{obj}") unless can_see?(obj)
end
# Creating Methods
def can_create_category?(parent)
is_staff?
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end
def can_create_topic?(parent)
can_create_post?(parent)
end
def can_create_post?(parent)
!SpamRulesEnforcer.block?(@user)
end
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def can_create_post_on_topic?(topic)
is_staff? || (not(topic.closed? || topic.archived?) && can_create_post?(topic))
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end
# Editing Methods
def can_edit_category?(category)
is_staff?
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end
def can_edit_post?(post)
is_staff? || (not(post.topic.archived?) && is_my_own?(post))
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end
def can_edit_user?(user)
is_me?(user) || is_staff?
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end
def can_edit_topic?(topic)
is_staff? || is_my_own?(topic)
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end
# Deleting Methods
def can_delete_post?(post)
# Can't delete the first post
return false if post.post_number == 1
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# You can delete your own posts
return !post.user_deleted? if is_my_own?(post)
is_staff?
end
# Recovery Method
def can_recover_post?(post)
is_staff?
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end
def can_delete_category?(category)
is_staff? && category.topic_count == 0
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end
def can_delete_topic?(topic)
is_staff? && not(Category.exists?(topic_id: topic.id))
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end
def can_delete_post_action?(post_action)
# You can only undo your own actions
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
post_action.created_at > SiteSetting.post_undo_action_window_mins.minutes.ago
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end
def can_send_private_message?(target)
(User === target || Group === target) &&
authenticated? &&
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# Can't send message to yourself
is_not_me?(target) &&
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# Have to be a basic level at least
@user.has_trust_level?(:basic) &&
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SiteSetting.enable_private_messages
end
def can_reply_as_new_topic?(topic)
authenticated? && topic && not(topic.private_message?) && @user.has_trust_level?(:basic)
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end
def can_see_topic?(topic)
if topic
is_staff? ||
topic.deleted_at.nil? &&
# not secure, or I can see it
(not(topic.secure_category?) || can_see_category?(topic.category)) &&
# not private, or I am allowed (or an admin)
(not(topic.private_message?) || authenticated? && (topic.all_allowed_users.where(id: @user.id).exists? || is_admin?))
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end
end
def can_see_post?(post)
post.present? && (is_staff? || (!post.deleted_at.present? && can_see_topic?(post.topic)))
end
def can_see_category?(category)
not(category.secure) || secure_category_ids.include?(category.id)
end
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def can_vote?(post, opts={})
post_can_act?(post,:vote, opts)
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
def post_can_act?(post, action_key, opts={})
taken = opts[:taken_actions].try(:keys).to_a
is_flag = PostActionType.is_flag?(action_key)
already_taken_this_action = taken.any? && taken.include?(PostActionType.types[action_key])
already_did_flagging = taken.any? && (taken & PostActionType.flag_types.values).any?
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if authenticated? && post
# we always allow flagging - NOTE: this does not seem true, see specs. (MVH)
(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
not(is_flag || already_taken_this_action) &&
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# nothing except flagging on archived posts
not(post.topic.archived?) &&
# don't like your own stuff
not(action_key == :like && is_my_own?(post)) &&
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# no voting more than once on single vote topics
not(action_key == :vote && opts[:voted_in_topic] && post.topic.has_meta_data_boolean?(:single_vote))
end
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end
def secure_category_ids
@secure_category_ids ||= @user.secure_category_ids
end
private
def is_my_own?(obj)
@user.present? &&
(obj.respond_to?(:user) || obj.respond_to?(:user_id)) &&
(obj.respond_to?(:user) ? obj.user == @user : true) &&
(obj.respond_to?(:user_id) ? (obj.user_id == @user.id) : true)
end
def is_me?(other)
other && authenticated? && User === other && @user == other
end
def is_not_me?(other)
@user.blank? || !is_me?(other)
end
def can_administer?(obj)
is_admin? && obj.present?
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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end