services/api/app/controllers/application_controller.rb

   1 class ApplicationController < ActionController::Base
   2   include CurrentApiClient
   3
   4   protect_from_forgery
   5   before_filter :uncamelcase_params_hash_keys
   6   around_filter :thread_with_auth_info, :except => [:render_error, :render_not_found]
   7
   8   before_filter :remote_ip
   9   before_filter :login_required, :except => :render_not_found
  10   before_filter :catch_redirect_hint
  11
  12   before_filter :load_where_param, :only => :index
  13   before_filter :find_objects_for_index, :only => :index
  14   before_filter :find_object_by_uuid, :except => [:index, :create]
  15
  16   attr_accessor :resource_attrs
  17
  18   def index
  19     @objects.uniq!(&:id)
  20     if params[:eager] and params[:eager] != '0' and params[:eager] != 0 and params[:eager] != ''
  21       @objects.each(&:eager_load_associations)
  22     end
  23     render_list
  24   end
  25
  26   def show
  27     if @object
  28       render json: @object.as_api_response(:superuser)
  29     else
  30       render_not_found("object not found")
  31     end
  32   end
  33
  34   def create
  35     @object = model_class.new resource_attrs
  36     @object.save
  37     show
  38   end
  39
  40   def update
  41     attrs_to_update = resource_attrs.reject { |k,v| [:kind,:etag].index k }
  42     if @object.update_attributes attrs_to_update
  43       show
  44     else
  45       render json: { errors: @object.errors.full_messages }, status: 422
  46     end
  47   end
  48
  49   def destroy
  50     @object.destroy
  51     show
  52   end
  53
  54   def catch_redirect_hint
  55     if !current_user
  56       if params.has_key?('redirect_to') then
  57         session[:redirect_to] = params[:redirect_to]
  58       end
  59     end
  60   end
  61
  62   begin
  63     rescue_from Exception,
  64     :with => :render_error
  65     rescue_from ActiveRecord::RecordNotFound,
  66     :with => :render_not_found
  67     rescue_from ActionController::RoutingError,
  68     :with => :render_not_found
  69     rescue_from ActionController::UnknownController,
  70     :with => :render_not_found
  71     rescue_from ActionController::UnknownAction,
  72     :with => :render_not_found
  73     rescue_from ArvadosModel::PermissionDeniedError,
  74     :with => :render_error
  75   end
  76
  77   def render_error(e)
  78     logger.error e.inspect
  79     logger.error e.backtrace.collect { |x| x + "\n" }.join('') if e.backtrace
  80     if @object and @object.errors and @object.errors.full_messages and not @object.errors.full_messages.empty?
  81       errors = @object.errors.full_messages
  82     else
  83       errors = [e.inspect]
  84     end
  85     render json: { errors: errors }, status: 422
  86   end
  87
  88   def render_not_found(e=ActionController::RoutingError.new("Path not found"))
  89     logger.error e.inspect
  90     render json: { errors: ["Path not found"] }, status: 404
  91   end
  92
  93   protected
  94
  95   def load_where_param
  96     if params[:where].nil? or params[:where] == ""
  97       @where = {}
  98     elsif params[:where].is_a? Hash
  99       @where = params[:where]
 100     elsif params[:where].is_a? String
 101       begin
 102         @where = Oj.load(params[:where])
 103       rescue
 104         raise ArgumentError.new("Could not parse \"where\" param as an object")
 105       end
 106     end
 107   end
 108
 109   def find_objects_for_index
 110     uuid_list = [current_user.uuid, *current_user.groups_i_can(:read)]
 111     sanitized_uuid_list = uuid_list.
 112       collect { |uuid| model_class.sanitize(uuid) }.join(', ')
 113     or_references_me = ''
 114     if model_class == Link and current_user
 115       or_references_me = "OR (#{table_name}.link_class in (#{model_class.sanitize 'permission'}, #{model_class.sanitize 'resources'}) AND #{model_class.sanitize current_user.uuid} IN (#{table_name}.head_uuid, #{table_name}.tail_uuid))"
 116     end
 117     @objects ||= model_class.
 118       joins("LEFT JOIN links permissions ON permissions.head_uuid in (#{table_name}.owner_uuid, #{table_name}.uuid) AND permissions.tail_uuid in (#{sanitized_uuid_list}) AND permissions.link_class='permission'").
 119       where("?=? OR #{table_name}.owner_uuid in (?) OR #{table_name}.uuid=? OR permissions.head_uuid IS NOT NULL #{or_references_me}",
 120             true, current_user.is_admin,
 121             uuid_list,
 122             current_user.uuid)
 123     if !@where.empty?
 124       conditions = ['1=1']
 125       @where.each do |attr,value|
 126         if attr == 'any' or attr == :any
 127           if value.is_a?(Array) and
 128               value[0] == 'contains' and
 129               model_class.columns.collect(&:name).index('name') then
 130             conditions[0] << " and #{table_name}.name ilike ?"
 131             conditions << "%#{value[1]}%"
 132           end
 133         elsif attr.to_s.match(/^[a-z][_a-z0-9]+$/) and
 134             model_class.columns.collect(&:name).index(attr.to_s)
 135           if value.nil?
 136             conditions[0] << " and #{table_name}.#{attr} is ?"
 137             conditions << nil
 138           elsif value.is_a? Array
 139             conditions[0] << " and #{table_name}.#{attr} in (?)"
 140             conditions << value
 141           elsif value.is_a? String or value.is_a? Fixnum or value == true or value == false
 142             conditions[0] << " and #{table_name}.#{attr}=?"
 143             conditions << value
 144           elsif value.is_a? Hash
 145             # Not quite the same thing as "equal?" but better than nothing?
 146             value.each do |k,v|
 147               if v.is_a? String
 148                 conditions[0] << " and #{table_name}.#{attr} ilike ?"
 149                 conditions << "%#{k}%#{v}%"
 150               end
 151             end
 152           end
 153         end
 154       end
 155       if conditions.length > 1
 156         conditions[0].sub!(/^1=1 and /, '')
 157         @objects = @objects.
 158           where(*conditions)
 159       end
 160     end
 161     if params[:limit]
 162       begin
 163         @objects = @objects.limit(params[:limit].to_i)
 164       rescue
 165         raise ArgumentError.new("Invalid value for limit parameter")
 166       end
 167     else
 168       @objects = @objects.limit(100)
 169     end
 170     orders = []
 171     if params[:order]
 172       params[:order].split(',').each do |order|
 173         attr, direction = order.strip.split " "
 174         direction ||= 'asc'
 175         if attr.match /^[a-z][_a-z0-9]+$/ and
 176             model_class.columns.collect(&:name).index(attr) and
 177             ['asc','desc'].index direction.downcase
 178           orders << "#{table_name}.#{attr} #{direction.downcase}"
 179         end
 180       end
 181     end
 182     if orders.empty?
 183       orders << "#{table_name}.modified_at desc"
 184     end
 185     @objects = @objects.order(orders.join ", ")
 186   end
 187
 188   def resource_attrs
 189     return @attrs if @attrs
 190     @attrs = params[resource_name]
 191     if @attrs.is_a? String
 192       @attrs = uncamelcase_hash_keys(Oj.load @attrs)
 193     end
 194     unless @attrs.is_a? Hash
 195       message = "No #{resource_name}"
 196       if resource_name.index('_')
 197         message << " (or #{resource_name.camelcase(:lower)})"
 198       end
 199       message << " hash provided with request"
 200       raise ArgumentError.new(message)
 201     end
 202     %w(created_at modified_by_client_uuid modified_by_user_uuid modified_at).each do |x|
 203       @attrs.delete x
 204     end
 205     @attrs
 206   end
 207
 208   # Authentication
 209   def login_required
 210     if !current_user
 211       respond_to do |format|
 212         format.json {
 213           render :json => { errors: ['Not logged in'] }.to_json, status: 401
 214         }
 215         format.html  {
 216           redirect_to '/auth/joshid'
 217         }
 218       end
 219     end
 220   end
 221
 222   def admin_required
 223     unless current_user and current_user.is_admin
 224       render :json => { errors: ['Forbidden'] }.to_json, status: 403
 225     end
 226   end
 227
 228   def thread_with_auth_info
 229     begin
 230       user = nil
 231       api_client = nil
 232       api_client_auth = nil
 233       supplied_token =
 234         params[:api_token] ||
 235         params[:oauth_token] ||
 236         request.headers["Authorization"].andand.match(/OAuth2 ([a-z0-9]+)/).andand[1]
 237       if supplied_token
 238         api_client_auth = ApiClientAuthorization.
 239           includes(:api_client, :user).
 240           where('api_token=? and (expires_at is null or expires_at > now())', supplied_token).
 241           first
 242         if api_client_auth
 243           session[:user_id] = api_client_auth.user.id
 244           session[:api_client_uuid] = api_client_auth.api_client.andand.uuid
 245           session[:api_client_authorization_id] = api_client_auth.id
 246           user = api_client_auth.user
 247           api_client = api_client_auth.api_client
 248         end
 249       elsif session[:user_id]
 250         user = User.find(session[:user_id]) rescue nil
 251         api_client = ApiClient.
 252           where('uuid=?',session[:api_client_uuid]).
 253           first rescue nil
 254         if session[:api_client_authorization_id] then
 255           api_client_auth = ApiClientAuthorization.
 256             find session[:api_client_authorization_id]
 257         end
 258       end
 259       Thread.current[:api_client_ip_address] = remote_ip
 260       Thread.current[:api_client_authorization] = api_client_auth
 261       Thread.current[:api_client_uuid] = api_client.andand.uuid
 262       Thread.current[:api_client] = api_client
 263       Thread.current[:user] = user
 264       if api_client_auth
 265         api_client_auth.last_used_at = Time.now
 266         api_client_auth.last_used_by_ip_address = remote_ip
 267         api_client_auth.save validate: false
 268       end
 269       yield
 270     ensure
 271       Thread.current[:api_client_ip_address] = nil
 272       Thread.current[:api_client_authorization] = nil
 273       Thread.current[:api_client_uuid] = nil
 274       Thread.current[:api_client] = nil
 275       Thread.current[:user] = nil
 276     end
 277   end
 278   # /Authentication
 279
 280   def model_class
 281     controller_name.classify.constantize
 282   end
 283
 284   def resource_name             # params[] key used by client
 285     controller_name.singularize
 286   end
 287
 288   def table_name
 289     controller_name
 290   end
 291
 292   def find_object_by_uuid
 293     if params[:id] and params[:id].match /\D/
 294       params[:uuid] = params.delete :id
 295     end
 296     @object = model_class.where('uuid=?', params[:uuid]).first
 297   end
 298
 299   def self.accept_attribute_as_json(attr, force_class=nil)
 300     before_filter lambda { accept_attribute_as_json attr, force_class }
 301   end
 302   def accept_attribute_as_json(attr, force_class)
 303     if params[resource_name].is_a? Hash
 304       if params[resource_name][attr].is_a? String
 305         params[resource_name][attr] = Oj.load params[resource_name][attr]
 306         if force_class and !params[resource_name][attr].is_a? force_class
 307           raise TypeError.new("#{resource_name}[#{attr.to_s}] must be a #{force_class.to_s}")
 308         end
 309       end
 310     end
 311   end
 312
 313   def uncamelcase_params_hash_keys
 314     self.params = uncamelcase_hash_keys(params)
 315   end
 316   def uncamelcase_hash_keys(h, max_depth=-1)
 317     if h.is_a? Hash and max_depth != 0
 318       nh = Hash.new
 319       h.each do |k,v|
 320         if k.class == String
 321           nk = k.underscore
 322         elsif k.class == Symbol
 323           nk = k.to_s.underscore.to_sym
 324         else
 325           nk = k
 326         end
 327         nh[nk] = uncamelcase_hash_keys(v, max_depth-1)
 328       end
 329       h.replace(nh)
 330     end
 331     h
 332   end
 333
 334   def render_list
 335     @object_list = {
 336       :kind  => "arvados##{resource_name}List",
 337       :etag => "",
 338       :self_link => "",
 339       :next_page_token => "",
 340       :next_link => "",
 341       :items => @objects.as_api_response(:superuser)
 342     }
 343     render json: @object_list
 344   end
 345
 346   def remote_ip
 347     # Caveat: this is highly dependent on the proxy setup. YMMV.
 348     if request.headers.has_key?('HTTP_X_REAL_IP') then
 349       # We're behind a reverse proxy
 350       @remote_ip = request.headers['HTTP_X_REAL_IP']
 351     else
 352       # Hopefully, we are not!
 353       @remote_ip = request.env['REMOTE_ADDR']
 354     end
 355   end
 356
 357   def self._index_requires_parameters
 358     {
 359       where: { type: 'object', required: false },
 360       order: { type: 'string', required: false }
 361     }
 362   end
 363 end