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
attr_reader :user
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def initialize(user=nil)
@user = user
end
def current_user
@user
end
def is_admin?
!@user.nil? && @user.admin?
end
# Can the user see the object?
def can_see?(obj)
return false if obj.blank?
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see_method = :"can_see_#{obj.class.name.underscore}?"
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return send(see_method, obj) if respond_to?(see_method)
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return true
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end
# Can the user edit the obj
def can_edit?(obj)
return false if obj.blank?
return false if @user.blank?
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edit_method = :"can_edit_#{obj.class.name.underscore}?"
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return send(edit_method, obj) if respond_to?(edit_method)
true
end
# Can we delete the object
def can_delete?(obj)
return false if obj.blank?
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return false if @user.blank?
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delete_method = :"can_delete_#{obj.class.name.underscore}?"
return send(delete_method, obj) if respond_to?(delete_method)
true
end
def can_moderate?(obj)
return false if obj.blank?
return false if @user.blank?
@user.moderator?
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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?
# Can the user create a topic in the forum
def can_create?(klass, parent=nil)
return false if klass.blank?
return false if @user.blank?
# 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)
return false if target.blank?
return false if @user.blank?
# You must be an admin to impersonate
return false unless @user.admin?
# You may not impersonate other admins
return false if target.admin?
# You may not impersonate yourself
return false if @user == target
true
end
# Can we approve it?
def can_approve?(target)
return false if target.blank?
return false if @user.blank?
return false if target.approved?
@user.moderator?
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end
def can_ban?(user)
return false if user.blank?
return false unless @user.try(:admin?)
return false if user.admin?
true
end
def can_clear_flags?(post)
return false if @user.blank?
return false if post.blank?
@user.moderator?
end
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def can_revoke_admin?(admin)
return false unless @user.try(:admin?)
return false if admin.blank?
return false if @user.id == admin.id
return false unless admin.admin?
true
end
def can_grant_admin?(user)
return false unless @user.try(:admin?)
return false if user.blank?
return false if @user.id == user.id
return false if user.admin?
true
end
def can_revoke_moderation?(moderator)
return false unless @user.try(:admin?)
return false if moderator.blank?
return false if @user.id == moderator.id
return false unless moderator.moderator?
true
end
def can_grant_moderation?(user)
return false unless @user.try(:admin?)
return false if user.blank?
return false if @user.id == user.id
return false if user.admin?
return false if user.moderator?
true
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.present?
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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 if user.blank?
# Admins can't lock themselves out of a site
return true if user.admin?
user.approved?
end
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def can_see_pending_invites_from?(user)
return false if user.blank?
return false if @user.blank?
return user == @user
end
# For now, can_invite_to is basically can_see?
def can_invite_to?(object)
return false if @user.blank?
return false unless can_see?(object)
return false if SiteSetting.must_approve_users?
@user.has_trust_level?(:regular) || @user.moderator?
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end
def can_see_deleted_posts?
return true if is_admin?
false
end
def can_see_private_messages?(user_id)
return true if is_admin?
return false if @user.blank?
@user.id == user_id
end
def can_delete_all_posts?(user)
return false unless is_admin?
return false if user.created_at < 7.days.ago
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true
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)
@user.moderator?
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end
def can_create_post_on_topic?(topic)
return true if @user.moderator?
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return false if topic.closed?
return false if topic.archived?
true
end
# Editing Methods
def can_edit_category?(category)
@user.moderator?
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end
def can_edit_post?(post)
return true if @user.moderator?
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return false if post.topic.archived?
(post.user == @user)
end
def can_edit_user?(user)
return true if user == @user
@user.admin?
end
def can_edit_topic?(topic)
return true if @user.moderator?
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return true if topic.user == @user
false
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 post.user == @user
@user.moderator?
end
# Recovery Method
def can_recover_post?(post)
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return false if @user.blank?
@user.moderator?
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end
def can_delete_category?(category)
return false unless @user.moderator?
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return category.topic_count == 0
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end
def can_delete_topic?(topic)
return false unless @user.moderator?
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return false if Category.exists?(topic_id: topic.id)
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true
end
def can_delete_post_action?(post_action)
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# You can only undo your own actions
return false unless @user
return false unless post_action.user_id == @user.id
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# Make sure they want to delete it within the window
return post_action.created_at > SiteSetting.post_undo_action_window_mins.minutes.ago
end
def can_send_private_message?(target_user)
return false unless User === target_user
return false if @user.blank?
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# Can't send message to yourself
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return false if @user.id == target_user.id
# Have to be a basic level at least
return false unless @user.has_trust_level?(:basic)
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SiteSetting.enable_private_messages
end
def can_reply_as_new_topic?(topic)
return false if @user.blank?
return false if topic.blank?
return false if topic.private_message?
@user.has_trust_level?(:basic)
end
def can_see_topic?(topic)
if topic.private_message?
return false if @user.blank?
return true if topic.allowed_users.include?(@user)
return is_admin?
end
true
end
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={})
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return false if @user.blank?
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return false if post.blank?
return false if post.topic.archived?
taken = opts[:taken_actions]
taken = taken.keys if taken
if PostActionType.is_flag?(action_key)
return false unless @user.has_trust_level?(:basic)
if taken
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return false unless (taken & PostActionType.flag_types.values).empty?
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end
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else
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return false if taken && taken.include?(PostActionType.types[action_key])
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end
case action_key
when :like
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return false if post.user == @user
when :vote then
return false if opts[:voted_in_topic] && post.topic.has_meta_data_boolean?(:single_vote)
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end
return true
end
end