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# Redmine - project management software

# Copyright (C) 2006-2011  Jean-Philippe Lang

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

# 

# This program 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 General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

require "digest/sha1"

class User < Principal

  include Redmine::SafeAttributes

  # Account statuses

  STATUS_ANONYMOUS  = 0

  STATUS_ACTIVE     = 1

  STATUS_REGISTERED = 2

  STATUS_LOCKED     = 3

  USER_FORMATS = {

    :firstname_lastname => '#{firstname} #{lastname}',

    :firstname => '#{firstname}',

    :lastname_firstname => '#{lastname} #{firstname}',

    :lastname_coma_firstname => '#{lastname}, #{firstname}',

    :username => '#{login}'

  }

  MAIL_NOTIFICATION_OPTIONS = [

    ['all', :label_user_mail_option_all],

    ['selected', :label_user_mail_option_selected],

    ['only_my_events', :label_user_mail_option_only_my_events],

    ['only_assigned', :label_user_mail_option_only_assigned],

    ['only_owner', :label_user_mail_option_only_owner],

    ['none', :label_user_mail_option_none]

  ]

  has_and_belongs_to_many :groups, :after_add => Proc.new {|user, group| group.user_added(user)},

                                   :after_remove => Proc.new {|user, group| group.user_removed(user)}

  has_many :issue_categories, :foreign_key => 'assigned_to_id', :dependent => :nullify

  has_many :changesets, :dependent => :nullify

  has_one :preference, :dependent => :destroy, :class_name => 'UserPreference'

  has_one :rss_token, :class_name => 'Token', :conditions => "action='feeds'"

  has_one :api_token, :class_name => 'Token', :conditions => "action='api'"

  belongs_to :auth_source

  has_one :ssamr_user_detail, :dependent => :destroy, :class_name => 'SsamrUserDetail'

  accepts_nested_attributes_for :ssamr_user_detail

  # Active non-anonymous users scope

  named_scope :active, :conditions => "#{User.table_name}.status = #{STATUS_ACTIVE}"

  acts_as_customizable

  attr_accessor :password, :password_confirmation

  attr_accessor :last_before_login_on

  # Prevents unauthorized assignments

  attr_protected :login, :admin, :password, :password_confirmation, :hashed_password

  validates_presence_of :login, :firstname, :lastname, :mail, :if => Proc.new { |user| !user.is_a?(AnonymousUser) }

  # TODO: is this validation correct validates_presence_of :ssamr_user_detail

  validates_uniqueness_of :login, :if => Proc.new { |user| !user.login.blank? }, :case_sensitive => false

  validates_uniqueness_of :mail, :if => Proc.new { |user| !user.mail.blank? }, :case_sensitive => false

  # Login must contain lettres, numbers, underscores only

  validates_format_of :login, :with => /^[a-z0-9_\-@\.]*$/i

  validates_length_of :login, :maximum => 30

  validates_length_of :firstname, :lastname, :maximum => 30

  validates_format_of :mail, :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i, :allow_nil => true

  validates_length_of :mail, :maximum => 60, :allow_nil => true

  validates_confirmation_of :password, :allow_nil => true

  validates_inclusion_of :mail_notification, :in => MAIL_NOTIFICATION_OPTIONS.collect(&:first), :allow_blank => true

  before_destroy :remove_references_before_destroy

  validates_acceptance_of :terms_and_conditions, :on => :create, :message => :must_accept_terms_and_conditions

  named_scope :in_group, lambda {|group|

    group_id = group.is_a?(Group) ? group.id : group.to_i

    { :conditions => ["#{User.table_name}.id IN (SELECT gu.user_id FROM #{table_name_prefix}groups_users#{table_name_suffix} gu WHERE gu.group_id = ?)", group_id] }

  }

  named_scope :not_in_group, lambda {|group|

    group_id = group.is_a?(Group) ? group.id : group.to_i

    { :conditions => ["#{User.table_name}.id NOT IN (SELECT gu.user_id FROM #{table_name_prefix}groups_users#{table_name_suffix} gu WHERE gu.group_id = ?)", group_id] }

  }

  def before_create

    self.mail_notification = Setting.default_notification_option if self.mail_notification.blank?

    true

  end

  def before_save

    # update hashed_password if password was set

    if self.password && self.auth_source_id.blank?

      salt_password(password)

    end

  end

  def reload(*args)

    @name = nil

    @projects_by_role = nil

    super

  end

  def mail=(arg)

    write_attribute(:mail, arg.to_s.strip)

  end

  def description=(arg)

    write_attribute(:description, arg.to_s.strip)

  end

  def identity_url=(url)

    if url.blank?

      write_attribute(:identity_url, '')

    else

      begin

        write_attribute(:identity_url, OpenIdAuthentication.normalize_identifier(url))

      rescue OpenIdAuthentication::InvalidOpenId

        # Invlaid url, don't save

      end

    end

    self.read_attribute(:identity_url)

  end

  # Returns the user that matches provided login and password, or nil

  def self.try_to_login(login, password)

    # Make sure no one can sign in with an empty password

    return nil if password.to_s.empty?

    user = find_by_login(login)

    if user

      # user is already in local database

      return nil if !user.active?

      if user.auth_source

        # user has an external authentication method

        return nil unless user.auth_source.authenticate(login, password)

      else

        # authentication with local password

        return nil unless user.check_password?(password)

      end

    else

      # user is not yet registered, try to authenticate with available sources

      attrs = AuthSource.authenticate(login, password)

      if attrs

        user = new(attrs)

        user.login = login

        user.language = Setting.default_language

        if user.save

          user.reload

          logger.info("User '#{user.login}' created from external auth source: #{user.auth_source.type} - #{user.auth_source.name}") if logger && user.auth_source

        end

      end

    end    

    user.update_attribute(:last_login_on, Time.now) if user && !user.new_record?

    user

  rescue => text

    raise text

  end

  # Returns the user who matches the given autologin +key+ or nil

  def self.try_to_autologin(key)

    tokens = Token.find_all_by_action_and_value('autologin', key)

    # Make sure there's only 1 token that matches the key

    if tokens.size == 1

      token = tokens.first

      if (token.created_on > Setting.autologin.to_i.day.ago) && token.user && token.user.active?

        token.user.update_attribute(:last_login_on, Time.now)

        token.user

      end

    end

  end

  # Return user's full name for display

  def name(formatter = nil)

    if formatter

      eval('"' + (USER_FORMATS[formatter] || USER_FORMATS[:firstname_lastname]) + '"')

    else

      @name ||= eval('"' + (USER_FORMATS[Setting.user_format] || USER_FORMATS[:firstname_lastname]) + '"')

    end

  end

  def active?

    self.status == STATUS_ACTIVE

  end

  def registered?

    self.status == STATUS_REGISTERED

  end

  def locked?

    self.status == STATUS_LOCKED

  end

  def activate

    self.status = STATUS_ACTIVE

  end

  def register

    self.status = STATUS_REGISTERED

  end

  def lock

    self.status = STATUS_LOCKED

  end

  def activate!

    update_attribute(:status, STATUS_ACTIVE)

  end

  def register!

    update_attribute(:status, STATUS_REGISTERED)

  end

  def lock!

    update_attribute(:status, STATUS_LOCKED)

  end

  # Returns true if +clear_password+ is the correct user's password, otherwise false

  def check_password?(clear_password)

    if auth_source_id.present?

      auth_source.authenticate(self.login, clear_password)

    else

      User.hash_password("#{salt}#{User.hash_password clear_password}") == hashed_password

    end

  end

  # Generates a random salt and computes hashed_password for +clear_password+

  # The hashed password is stored in the following form: SHA1(salt + SHA1(password))

  def salt_password(clear_password)

    self.salt = User.generate_salt

    self.hashed_password = User.hash_password("#{salt}#{User.hash_password clear_password}")

  end

  # Does the backend storage allow this user to change their password?

  def change_password_allowed?

    return true if auth_source_id.blank?

    return auth_source.allow_password_changes?

  end

  # Generate and set a random password.  Useful for automated user creation

  # Based on Token#generate_token_value

  #

  def random_password

    chars = ("a".."z").to_a + ("A".."Z").to_a + ("0".."9").to_a

    password = ''

    40.times { |i| password << chars[rand(chars.size-1)] }

    self.password = password

    self.password_confirmation = password

    self

  end

  def pref

    self.preference ||= UserPreference.new(:user => self)

  end

  def time_zone

    @time_zone ||= (self.pref.time_zone.blank? ? nil : ActiveSupport::TimeZone[self.pref.time_zone])

  end

  def wants_comments_in_reverse_order?

    self.pref[:comments_sorting] == 'desc'

  end

  # Return user's RSS key (a 40 chars long string), used to access feeds

  def rss_key

    token = self.rss_token || Token.create(:user => self, :action => 'feeds')

    token.value

  end

  # Return user's API key (a 40 chars long string), used to access the API

  def api_key

    token = self.api_token || self.create_api_token(:action => 'api')

    token.value

  end

  # Return an array of project ids for which the user has explicitly turned mail notifications on

  def notified_projects_ids

    @notified_projects_ids ||= memberships.select {|m| m.mail_notification?}.collect(&:project_id)

  end

  def notified_project_ids=(ids)

    Member.update_all("mail_notification = #{connection.quoted_false}", ['user_id = ?', id])

    Member.update_all("mail_notification = #{connection.quoted_true}", ['user_id = ? AND project_id IN (?)', id, ids]) if ids && !ids.empty?

    @notified_projects_ids = nil

    notified_projects_ids

  end

  def valid_notification_options

    self.class.valid_notification_options(self)

  end

  # Only users that belong to more than 1 project can select projects for which they are notified

  def self.valid_notification_options(user=nil)

    # Note that @user.membership.size would fail since AR ignores

    # :include association option when doing a count

    if user.nil? || user.memberships.length < 1

      MAIL_NOTIFICATION_OPTIONS.reject {|option| option.first == 'selected'}

    else

      MAIL_NOTIFICATION_OPTIONS

    end

  end

  # Find a user account by matching the exact login and then a case-insensitive

  # version.  Exact matches will be given priority.

  def self.find_by_login(login)

    # force string comparison to be case sensitive on MySQL

    type_cast = (ActiveRecord::Base.connection.adapter_name == 'MySQL') ? 'BINARY' : ''

    # First look for an exact match

    user = first(:conditions => ["#{type_cast} login = ?", login])

    # Fail over to case-insensitive if none was found

    user ||= first(:conditions => ["#{type_cast} LOWER(login) = ?", login.to_s.downcase])

  end

  def self.find_by_rss_key(key)

    token = Token.find_by_value(key)

    token && token.user.active? ? token.user : nil

  end

  def self.find_by_api_key(key)

    token = Token.find_by_action_and_value('api', key)

    token && token.user.active? ? token.user : nil

  end

  # Makes find_by_mail case-insensitive

  def self.find_by_mail(mail)

    find(:first, :conditions => ["LOWER(mail) = ?", mail.to_s.downcase])

  end

  def to_s

    name

  end

  # Returns the current day according to user's time zone

  def today

    if time_zone.nil?

      Date.today

    else

      Time.now.in_time_zone(time_zone).to_date

    end

  end

  def logged?

    true

  end

  def anonymous?

    !logged?

  end

  # Return user's roles for project

  def roles_for_project(project)

    roles = []

    # No role on archived projects

    return roles unless project && project.active?

    if logged?

      # Find project membership

      membership = memberships.detect {|m| m.project_id == project.id}

      if membership

        roles = membership.roles

      else

        @role_non_member ||= Role.non_member

        roles << @role_non_member

      end

    else

      @role_anonymous ||= Role.anonymous

      roles << @role_anonymous

    end

    roles

  end

  # Return true if the user is a member of project

  def member_of?(project)

    !roles_for_project(project).detect {|role| role.member?}.nil?

  end

  # Returns a hash of user's projects grouped by roles

  def projects_by_role

    return @projects_by_role if @projects_by_role

    @projects_by_role = Hash.new {|h,k| h[k]=[]}

    memberships.each do |membership|

      membership.roles.each do |role|

        @projects_by_role[role] << membership.project if membership.project

      end

    end

    @projects_by_role.each do |role, projects|

      projects.uniq!

    end

    @projects_by_role

  end

  # Return true if the user is allowed to do the specified action on a specific context

  # Action can be:

  # * a parameter-like Hash (eg. :controller => 'projects', :action => 'edit')

  # * a permission Symbol (eg. :edit_project)

  # Context can be:

  # * a project : returns true if user is allowed to do the specified action on this project

  # * an array of projects : returns true if user is allowed on every project

  # * nil with options[:global] set : check if user has at least one role allowed for this action, 

  #   or falls back to Non Member / Anonymous permissions depending if the user is logged

  def allowed_to?(action, context, options={}, &block)

    if context && context.is_a?(Project)

      # No action allowed on archived projects

      return false unless context.active?

      # No action allowed on disabled modules

      return false unless context.allows_to?(action)

      # Admin users are authorized for anything else

      return true if admin?

      roles = roles_for_project(context)

      return false unless roles

      roles.detect {|role|

        (context.is_public? || role.member?) &&

        role.allowed_to?(action) &&

        (block_given? ? yield(role, self) : true)

      }

    elsif context && context.is_a?(Array)

      # Authorize if user is authorized on every element of the array

      context.map do |project|

        allowed_to?(action, project, options, &block)

      end.inject do |memo,allowed|

        memo && allowed

      end

    elsif options[:global]

      # Admin users are always authorized

      return true if admin?

      # authorize if user has at least one role that has this permission

      roles = memberships.collect {|m| m.roles}.flatten.uniq

      roles << (self.logged? ? Role.non_member : Role.anonymous)

      roles.detect {|role|

        role.allowed_to?(action) &&

        (block_given? ? yield(role, self) : true)

      }

    else

      false

    end

  end

  # Is the user allowed to do the specified action on any project?

  # See allowed_to? for the actions and valid options.

  def allowed_to_globally?(action, options, &block)

    allowed_to?(action, nil, options.reverse_merge(:global => true), &block)

  end

  safe_attributes 'login',

    'firstname',

    'lastname',

    'mail',

    'mail_notification',

    'language',

    'custom_field_values',

    'custom_fields',

    'identity_url'

  safe_attributes 'status',

    'auth_source_id',

    :if => lambda {|user, current_user| current_user.admin?}

  safe_attributes 'group_ids',

    :if => lambda {|user, current_user| current_user.admin? && !user.new_record?}

  # Utility method to help check if a user should be notified about an

  # event.

  #

  # TODO: only supports Issue events currently

  def notify_about?(object)

    case mail_notification

    when 'all'

      true

    when 'selected'

      # user receives notifications for created/assigned issues on unselected projects

      if object.is_a?(Issue) && (object.author == self || object.assigned_to == self)

        true

      else

        false

      end

    when 'none'

      false

    when 'only_my_events'

      if object.is_a?(Issue) && (object.author == self || object.assigned_to == self)

        true

      else

        false

      end

    when 'only_assigned'

      if object.is_a?(Issue) && object.assigned_to == self

        true

      else

        false

      end

    when 'only_owner'

      if object.is_a?(Issue) && object.author == self

        true

      else

        false

      end

    else

      false

    end

  end

  def self.current=(user)

    @current_user = user

  end

  def self.current

    @current_user ||= User.anonymous

  end

  # Returns the anonymous user.  If the anonymous user does not exist, it is created.  There can be only

  # one anonymous user per database.

  def self.anonymous

    anonymous_user = AnonymousUser.find(:first)

    if anonymous_user.nil?

      anonymous_user = AnonymousUser.create(:lastname => 'Anonymous', :firstname => '', :mail => '', :login => '', :status => 0)

      raise 'Unable to create the anonymous user.' if anonymous_user.new_record?

    end

    anonymous_user

  end

  # Salts all existing unsalted passwords

  # It changes password storage scheme from SHA1(password) to SHA1(salt + SHA1(password))

  # This method is used in the SaltPasswords migration and is to be kept as is

  def self.salt_unsalted_passwords!

    transaction do

      User.find_each(:conditions => "salt IS NULL OR salt = ''") do |user|

        next if user.hashed_password.blank?

        salt = User.generate_salt

        hashed_password = User.hash_password("#{salt}#{user.hashed_password}")

        User.update_all("salt = '#{salt}', hashed_password = '#{hashed_password}'", ["id = ?", user.id] )

      end

    end

  end

  protected

  def validate

    # Password length validation based on setting

    if !password.nil? && password.size < Setting.password_min_length.to_i

      errors.add(:password, :too_short, :count => Setting.password_min_length.to_i)

    end

  end

  private

  # Removes references that are not handled by associations

  # Things that are not deleted are reassociated with the anonymous user

  def remove_references_before_destroy

    return if self.id.nil?

    substitute = User.anonymous

    Attachment.update_all ['author_id = ?', substitute.id], ['author_id = ?', id]

    Comment.update_all ['author_id = ?', substitute.id], ['author_id = ?', id]

    Issue.update_all ['author_id = ?', substitute.id], ['author_id = ?', id]

    Issue.update_all 'assigned_to_id = NULL', ['assigned_to_id = ?', id]

    Journal.update_all ['user_id = ?', substitute.id], ['user_id = ?', id]

    JournalDetail.update_all ['old_value = ?', substitute.id.to_s], ["property = 'attr' AND prop_key = 'assigned_to_id' AND old_value = ?", id.to_s]

    JournalDetail.update_all ['value = ?', substitute.id.to_s], ["property = 'attr' AND prop_key = 'assigned_to_id' AND value = ?", id.to_s]

    Message.update_all ['author_id = ?', substitute.id], ['author_id = ?', id]

    News.update_all ['author_id = ?', substitute.id], ['author_id = ?', id]

    # Remove private queries and keep public ones

    Query.delete_all ['user_id = ? AND is_public = ?', id, false]

    Query.update_all ['user_id = ?', substitute.id], ['user_id = ?', id]

    TimeEntry.update_all ['user_id = ?', substitute.id], ['user_id = ?', id]

    Token.delete_all ['user_id = ?', id]

    Watcher.delete_all ['user_id = ?', id]

    WikiContent.update_all ['author_id = ?', substitute.id], ['author_id = ?', id]

    WikiContent::Version.update_all ['author_id = ?', substitute.id], ['author_id = ?', id]

  end

  # Return password digest

  def self.hash_password(clear_password)

    Digest::SHA1.hexdigest(clear_password || "")

  end

  # Returns a 128bits random salt as a hex string (32 chars long)

  def self.generate_salt

    ActiveSupport::SecureRandom.hex(16)

  end

end

class AnonymousUser < User

  def validate_on_create

    # There should be only one AnonymousUser in the database

    errors.add_to_base 'An anonymous user already exists.' if AnonymousUser.find(:first)

  end

  def available_custom_fields

    []

  end

  # Overrides a few properties

  def logged?; false end

  def admin; false end

  def name(*args); I18n.t(:label_user_anonymous) end

  def mail; nil end

  def time_zone; nil end

  def rss_key; nil end

  # Anonymous user can not be destroyed

  def destroy

    false

  end

end