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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 'uri'

require 'cgi'

class Unauthorized < Exception; end

class ApplicationController < ActionController::Base

  include Redmine::I18n

  layout 'base'

  exempt_from_layout 'builder', 'rsb'

  protect_from_forgery

  def handle_unverified_request

    super

    cookies.delete(:autologin)

  end

  # Remove broken cookie after upgrade from 0.8.x (#4292)

  # See https://rails.lighthouseapp.com/projects/8994/tickets/3360

  # TODO: remove it when Rails is fixed

  before_filter :delete_broken_cookies

  def delete_broken_cookies

    if cookies['_redmine_session'] && cookies['_redmine_session'] !~ /--/

      cookies.delete '_redmine_session'

      redirect_to home_path

      return false

    end

  end

  before_filter :user_setup, :check_if_login_required, :set_localization

  filter_parameter_logging :password

  rescue_from ActionController::InvalidAuthenticityToken, :with => :invalid_authenticity_token

  rescue_from ::Unauthorized, :with => :deny_access

  include Redmine::Search::Controller

  include Redmine::MenuManager::MenuController

  helper Redmine::MenuManager::MenuHelper

  Redmine::Scm::Base.all.each do |scm|

    require_dependency "repository/#{scm.underscore}"

  end

  def user_setup

    # Check the settings cache for each request

    Setting.check_cache

    # Find the current user

    User.current = find_current_user

  end

  # Returns the current user or nil if no user is logged in

  # and starts a session if needed

  def find_current_user

    if session[:user_id]

      # existing session

      (User.active.find(session[:user_id]) rescue nil)

    elsif cookies[:autologin] && Setting.autologin?

      # auto-login feature starts a new session

      user = User.try_to_autologin(cookies[:autologin])

      session[:user_id] = user.id if user

      user

    elsif params[:format] == 'atom' && params[:key] && request.get? && accept_rss_auth?

      # RSS key authentication does not start a session

      User.find_by_rss_key(params[:key])

    elsif Setting.rest_api_enabled? && accept_api_auth?

      if (key = api_key_from_request)

        # Use API key

        User.find_by_api_key(key)

      else

        # HTTP Basic, either username/password or API key/random

        authenticate_with_http_basic do |username, password|

          User.try_to_login(username, password) || User.find_by_api_key(username)

        end

      end

    end

  end

  # Sets the logged in user

  def logged_user=(user)

    reset_session

    if user && user.is_a?(User)

      User.current = user

      session[:user_id] = user.id

    else

      User.current = User.anonymous

    end

  end

  # check if login is globally required to access the application

  def check_if_login_required

    # no check needed if user is already logged in

    return true if User.current.logged?

    require_login if Setting.login_required?

  end

  def set_localization

    lang = nil

    if User.current.logged?

      lang = find_language(User.current.language)

    end

    if lang.nil? && request.env['HTTP_ACCEPT_LANGUAGE']

      accept_lang = parse_qvalues(request.env['HTTP_ACCEPT_LANGUAGE']).first

      if !accept_lang.blank?

        accept_lang = accept_lang.downcase

        lang = find_language(accept_lang) || find_language(accept_lang.split('-').first)

      end

    end

    lang ||= Setting.default_language

    set_language_if_valid(lang)

  end

  def require_login

    if !User.current.logged?

      # Extract only the basic url parameters on non-GET requests

      if request.get?

        url = url_for(params)

      else

        url = url_for(:controller => params[:controller], :action => params[:action], :id => params[:id], :project_id => params[:project_id])

      end

      respond_to do |format|

        format.html { redirect_to :controller => "account", :action => "login", :back_url => url }

        format.atom { redirect_to :controller => "account", :action => "login", :back_url => url }

        format.xml  { head :unauthorized, 'WWW-Authenticate' => 'Basic realm="Redmine API"' }

        format.js   { head :unauthorized, 'WWW-Authenticate' => 'Basic realm="Redmine API"' }

        format.json { head :unauthorized, 'WWW-Authenticate' => 'Basic realm="Redmine API"' }

      end

      return false

    end

    true

  end

  def require_admin

    return unless require_login

    if !User.current.admin?

      render_403

      return false

    end

    true

  end

  def deny_access

    User.current.logged? ? render_403 : require_login

  end

  # Authorize the user for the requested action

  def authorize(ctrl = params[:controller], action = params[:action], global = false)

    allowed = User.current.allowed_to?({:controller => ctrl, :action => action}, @project || @projects, :global => global)

    if allowed

      true

    else

      if @project && @project.archived?

        render_403 :message => :notice_not_authorized_archived_project

      else

        deny_access

      end

    end

  end

  # Authorize the user for the requested action outside a project

  def authorize_global(ctrl = params[:controller], action = params[:action], global = true)

    authorize(ctrl, action, global)

  end

  # Find project of id params[:id]

  def find_project

    @project = Project.find(params[:id])

  rescue ActiveRecord::RecordNotFound

    render_404

  end

  # Find project of id params[:project_id]

  def find_project_by_project_id

    @project = Project.find(params[:project_id])

  rescue ActiveRecord::RecordNotFound

    render_404

  end

  # Find a project based on params[:project_id]

  # TODO: some subclasses override this, see about merging their logic

  def find_optional_project

    @project = Project.find(params[:project_id]) unless params[:project_id].blank?

    allowed = User.current.allowed_to?({:controller => params[:controller], :action => params[:action]}, @project, :global => true)

    allowed ? true : deny_access

  rescue ActiveRecord::RecordNotFound

    render_404

  end

  # Finds and sets @project based on @object.project

  def find_project_from_association

    render_404 unless @object.present?

    @project = @object.project

  end

  def find_model_object

    model = self.class.read_inheritable_attribute('model_object')

    if model

      @object = model.find(params[:id])

      self.instance_variable_set('@' + controller_name.singularize, @object) if @object

    end

  rescue ActiveRecord::RecordNotFound

    render_404

  end

  def self.model_object(model)

    write_inheritable_attribute('model_object', model)

  end

  # Filter for bulk issue operations

  def find_issues

    @issues = Issue.find_all_by_id(params[:id] || params[:ids])

    raise ActiveRecord::RecordNotFound if @issues.empty?

    if @issues.detect {|issue| !issue.visible?}

      deny_access

      return

    end

    @projects = @issues.collect(&:project).compact.uniq

    @project = @projects.first if @projects.size == 1

  rescue ActiveRecord::RecordNotFound

    render_404

  end

  # Check if project is unique before bulk operations

  def check_project_uniqueness

    unless @project

      # TODO: let users bulk edit/move/destroy issues from different projects

      render_error 'Can not bulk edit/move/destroy issues from different projects'

      return false

    end

  end

  # make sure that the user is a member of the project (or admin) if project is private

  # used as a before_filter for actions that do not require any particular permission on the project

  def check_project_privacy

    if @project && @project.active?

      if @project.is_public? || User.current.member_of?(@project) || User.current.admin?

        true

      else

        deny_access

      end

    else

      @project = nil

      render_404

      false

    end

  end

  def back_url

    params[:back_url] || request.env['HTTP_REFERER']

  end

  def redirect_back_or_default(default)

    back_url = CGI.unescape(params[:back_url].to_s)

    if !back_url.blank?

      begin

        uri = URI.parse(back_url)

        # do not redirect user to another host or to the login or register page

        if (uri.relative? || (uri.host == request.host)) && !uri.path.match(%r{/(login|account/register)})

          redirect_to(back_url)

          return

        end

      rescue URI::InvalidURIError

        # redirect to default

      end

    end

    redirect_to default

    false

  end

  def render_403(options={})

    @project = nil

    render_error({:message => :notice_not_authorized, :status => 403}.merge(options))

    return false

  end

  def render_404(options={})

    render_error({:message => :notice_file_not_found, :status => 404}.merge(options))

    return false

  end

  # Renders an error response

  def render_error(arg)

    arg = {:message => arg} unless arg.is_a?(Hash)

    @message = arg[:message]

    @message = l(@message) if @message.is_a?(Symbol)

    @status = arg[:status] || 500

    respond_to do |format|

      format.html {

        render :template => 'common/error', :layout => use_layout, :status => @status

      }

      format.atom { head @status }

      format.xml { head @status }

      format.js { head @status }

      format.json { head @status }

    end

  end

  # Filter for actions that provide an API response

  # but have no HTML representation for non admin users

  def require_admin_or_api_request

    return true if api_request?

    if User.current.admin?

      true

    elsif User.current.logged?

      render_error(:status => 406)

    else

      deny_access

    end

  end

  # Picks which layout to use based on the request

  #

  # @return [boolean, string] name of the layout to use or false for no layout

  def use_layout

    request.xhr? ? false : 'base'

  end

  def invalid_authenticity_token

    if api_request?

      logger.error "Form authenticity token is missing or is invalid. API calls must include a proper Content-type header (text/xml or text/json)."

    end

    render_error "Invalid form authenticity token."

  end

  def render_feed(items, options={})

    @items = items || []

    @items.sort! {|x,y| y.event_datetime <=> x.event_datetime }

    @items = @items.slice(0, Setting.feeds_limit.to_i)

    @title = options[:title] || Setting.app_title

    render :template => "common/feed.atom", :layout => false,

           :content_type => 'application/atom+xml'

  end

  # TODO: remove in Redmine 1.4

  def self.accept_key_auth(*actions)

    ActiveSupport::Deprecation.warn "ApplicationController.accept_key_auth is deprecated and will be removed in Redmine 1.4. Use accept_rss_auth (or accept_api_auth) instead."

    accept_rss_auth(*actions)

  end

  # TODO: remove in Redmine 1.4

  def accept_key_auth_actions

    ActiveSupport::Deprecation.warn "ApplicationController.accept_key_auth_actions is deprecated and will be removed in Redmine 1.4. Use accept_rss_auth (or accept_api_auth) instead."

    self.class.accept_rss_auth

  end

  def self.accept_rss_auth(*actions)

    if actions.any?

      write_inheritable_attribute('accept_rss_auth_actions', actions)

    else

      read_inheritable_attribute('accept_rss_auth_actions') || []

    end

  end

  def accept_rss_auth?(action=action_name)

    self.class.accept_rss_auth.include?(action.to_sym)

  end

  def self.accept_api_auth(*actions)

    if actions.any?

      write_inheritable_attribute('accept_api_auth_actions', actions)

    else

      read_inheritable_attribute('accept_api_auth_actions') || []

    end

  end

  def accept_api_auth?(action=action_name)

    self.class.accept_api_auth.include?(action.to_sym)

  end

  # Returns the number of objects that should be displayed

  # on the paginated list

  def per_page_option

    per_page = nil

    if params[:per_page] && Setting.per_page_options_array.include?(params[:per_page].to_s.to_i)

      per_page = params[:per_page].to_s.to_i

      session[:per_page] = per_page

    elsif session[:per_page]

      per_page = session[:per_page]

    else

      per_page = Setting.per_page_options_array.first || 25

    end

    per_page

  end

  # Returns offset and limit used to retrieve objects

  # for an API response based on offset, limit and page parameters

  def api_offset_and_limit(options=params)

    if options[:offset].present?

      offset = options[:offset].to_i

      if offset < 0

        offset = 0

      end

    end

    limit = options[:limit].to_i

    if limit < 1

      limit = 25

    elsif limit > 100

      limit = 100

    end

    if offset.nil? && options[:page].present?

      offset = (options[:page].to_i - 1) * limit

      offset = 0 if offset < 0

    end

    offset ||= 0

    [offset, limit]

  end

  # qvalues http header parser

  # code taken from webrick

  def parse_qvalues(value)

    tmp = []

    if value

      parts = value.split(/,\s*/)

      parts.each {|part|

        if m = %r{^([^\s,]+?)(?:;\s*q=(\d+(?:\.\d+)?))?$}.match(part)

          val = m[1]

          q = (m[2] or 1).to_f

          tmp.push([val, q])

        end

      }

      tmp = tmp.sort_by{|val, q| -q}

      tmp.collect!{|val, q| val}

    end

    return tmp

  rescue

    nil

  end

  # Returns a string that can be used as filename value in Content-Disposition header

  def filename_for_content_disposition(name)

    request.env['HTTP_USER_AGENT'] =~ %r{MSIE} ? ERB::Util.url_encode(name) : name

  end

  def api_request?

    %w(xml json).include? params[:format]

  end

  # Returns the API key present in the request

  def api_key_from_request

    if params[:key].present?

      params[:key]

    elsif request.headers["X-Redmine-API-Key"].present?

      request.headers["X-Redmine-API-Key"]

    end

  end

  # Renders a warning flash if obj has unsaved attachments

  def render_attachment_warning_if_needed(obj)

    flash[:warning] = l(:warning_attachments_not_saved, obj.unsaved_attachments.size) if obj.unsaved_attachments.present?

  end

  # Sets the `flash` notice or error based the number of issues that did not save

  #

  # @param [Array, Issue] issues all of the saved and unsaved Issues

  # @param [Array, Integer] unsaved_issue_ids the issue ids that were not saved

  def set_flash_from_bulk_issue_save(issues, unsaved_issue_ids)

    if unsaved_issue_ids.empty?

      flash[:notice] = l(:notice_successful_update) unless issues.empty?

    else

      flash[:error] = l(:notice_failed_to_save_issues,

                        :count => unsaved_issue_ids.size,

                        :total => issues.size,

                        :ids => '#' + unsaved_issue_ids.join(', #'))

    end

  end

  # Rescues an invalid query statement. Just in case...

  def query_statement_invalid(exception)

    logger.error "Query::StatementInvalid: #{exception.message}" if logger

    session.delete(:query)

    sort_clear if respond_to?(:sort_clear)

    render_error "An error occurred while executing the query and has been logged. Please report this error to your Redmine administrator."

  end

  # Renders API response on validation failure

  def render_validation_errors(object)

    options = { :status => :unprocessable_entity, :layout => false }

    options.merge!(case params[:format]

      when 'xml';  { :xml =>  object.errors }

      when 'json'; { :json => {'errors' => object.errors} } # ActiveResource client compliance

      else

        raise "Unknown format #{params[:format]} in #render_validation_errors"

      end

    )

    render options

  end

  # Overrides #default_template so that the api template

  # is used automatically if it exists

  def default_template(action_name = self.action_name)

    if api_request?

      begin

        return self.view_paths.find_template(default_template_name(action_name), 'api')

      rescue ::ActionView::MissingTemplate

        # the api template was not found

        # fallback to the default behaviour

      end

    end

    super

  end

  # Overrides #pick_layout so that #render with no arguments

  # doesn't use the layout for api requests

  def pick_layout(*args)

    api_request? ? nil : super

  end

end