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# Copyright (C) 2007, 2008, 2009, 2010 Heiko Bernloehr (FreeIT.de).
#
# This file is part of ECS.
#
# ECS is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of
# the License, or (at your option) any later version.
#
# ECS is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License along with ECS. If not, see <http://www.gnu.org/licenses/>.
class Participant < ActiveRecord::Base
TTL = 3600 # seconds, how long an anonymous participant lives
after_save :garbage_collect
after_create :garbage_collect
after_destroy :delete_messages
belongs_to :organization
# TODO: warn user about possible deletions of messages.
has_many :memberships, :dependent => :destroy
has_many :communities, :through => :memberships
has_many :identities, :dependent => :destroy
has_many :events, :dependent => :destroy
validates_presence_of :name, :organization_id
validates_uniqueness_of :name
accepts_nested_attributes_for :identities, :allow_destroy => true, :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
accepts_nested_attributes_for :communities, :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }
#named_scope :reduced_attributes, :select => "name, description, dns, email"
named_scope :without_anonymous, :conditions => { :participants => { :anonymous => false } }
named_scope :anonymous, :conditions => { :participants => { :anonymous => true } }
named_scope :for_message, lambda { |message| {
:joins => [:memberships => {:membership_messages => :message}],
:conditions => {:messages => {:id => message.id}}}}
named_scope :for_community, lambda { |community| {
:joins => [:memberships => :community],
:conditions => { :communities => { :id => community.id }}}}
# test if the participant is the initial sender of the message in question.
def sender?(message)
if message.sender == id
true
else
false
end
end
def receiver?(message)
not Membership.receiver(id, message.id).empty?
end
def events?
self.events_.blank? ? false : true
end
def self.generate_anonymous_participant
cookie = Digest::SHA1.hexdigest('something secret'+Time.now.to_s+rand.to_s)
params = {
"name"=> "#{cookie}",
"identities_attributes"=>{"0"=>{"name"=>"#{cookie}", "description"=>"Cookie Identifier"}},
"community_ids"=>[Community.find_by_name("public").id],
"description"=>"Anonymous Participant",
"dns"=>"N/A",
"organization_id"=>Organization.find_by_name("not available").id,
"email"=>"N/A",
"ttl"=> DateTime.now.utc + TTL.seconds,
"anonymous"=>true
}
ap = new(params)
ap.save!
return ap, cookie
end
def self.touch_ttl(participant)
participant.ttl = DateTime.now.utc + TTL.seconds
participant.save
end
def mid(community)
Membership.for_participant_id_and_community_id(self, community.id).first.id
end
private
def garbage_collect
# garbage collect only if a new anonymous participant was created
if self.anonymous
Participant.destroy_all(["(anonymous = ?) AND (ttl < ?)", true, DateTime.now.utc])
end
end
def delete_messages
Message.destroy_all(["sender = ?", self.id])
end
end
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