services/api/app/controllers/application_controller.rb

   1 class ApplicationController < ActionController::Base
   2   include CurrentApiClient
   3
   4   respond_to :json
   5   protect_from_forgery
   6   around_filter :thread_with_auth_info, :except => [:render_error, :render_not_found]
   7
   8   before_filter :remote_ip
   9   before_filter :require_auth_scope_all, :except => :render_not_found
  10   before_filter :catch_redirect_hint
  11
  12   before_filter :load_where_param, :only => :index
  13   before_filter :load_filters_param, :only => :index
  14   before_filter :find_objects_for_index, :only => :index
  15   before_filter :find_object_by_uuid, :except => [:index, :create,
  16                                                   :render_error,
  17                                                   :render_not_found]
  18   before_filter :reload_object_before_update, :only => :update
  19   before_filter :render_404_if_no_object, except: [:index, :create,
  20                                                    :render_error,
  21                                                    :render_not_found]
  22
  23   attr_accessor :resource_attrs
  24
  25   def index
  26     @objects.uniq!(&:id)
  27     if params[:eager] and params[:eager] != '0' and params[:eager] != 0 and params[:eager] != ''
  28       @objects.each(&:eager_load_associations)
  29     end
  30     render_list
  31   end
  32
  33   def show
  34     render json: @object.as_api_response
  35   end
  36
  37   def create
  38     @object = model_class.new resource_attrs
  39     if @object.save
  40       show
  41     else
  42       raise "Save failed"
  43     end
  44   end
  45
  46   def update
  47     attrs_to_update = resource_attrs.reject { |k,v|
  48       [:kind, :etag, :href].index k
  49     }
  50     if @object.update_attributes attrs_to_update
  51       show
  52     else
  53       raise "Update failed"
  54     end
  55   end
  56
  57   def destroy
  58     @object.destroy
  59     show
  60   end
  61
  62   def catch_redirect_hint
  63     if !current_user
  64       if params.has_key?('redirect_to') then
  65         session[:redirect_to] = params[:redirect_to]
  66       end
  67     end
  68   end
  69
  70   begin
  71     rescue_from Exception,
  72     :with => :render_error
  73     rescue_from ActiveRecord::RecordNotFound,
  74     :with => :render_not_found
  75     rescue_from ActionController::RoutingError,
  76     :with => :render_not_found
  77     rescue_from ActionController::UnknownController,
  78     :with => :render_not_found
  79     rescue_from AbstractController::ActionNotFound,
  80     :with => :render_not_found
  81     rescue_from ArvadosModel::PermissionDeniedError,
  82     :with => :render_error
  83   end
  84
  85   def render_404_if_no_object
  86     render_not_found "Object not found" if !@object
  87   end
  88
  89   def render_error(e)
  90     logger.error e.inspect
  91     if e.respond_to? :backtrace and e.backtrace
  92       logger.error e.backtrace.collect { |x| x + "\n" }.join('')
  93     end
  94     if @object and @object.errors and @object.errors.full_messages and not @object.errors.full_messages.empty?
  95       errors = @object.errors.full_messages
  96     else
  97       errors = [e.inspect]
  98     end
  99     status = e.respond_to?(:http_status) ? e.http_status : 422
 100     render json: { errors: errors }, status: status
 101   end
 102
 103   def render_not_found(e=ActionController::RoutingError.new("Path not found"))
 104     logger.error e.inspect
 105     render json: { errors: ["Path not found"] }, status: 404
 106   end
 107
 108   protected
 109
 110   def load_where_param
 111     if params[:where].nil? or params[:where] == ""
 112       @where = {}
 113     elsif params[:where].is_a? Hash
 114       @where = params[:where]
 115     elsif params[:where].is_a? String
 116       begin
 117         @where = Oj.load(params[:where])
 118         raise unless @where.is_a? Hash
 119       rescue
 120         raise ArgumentError.new("Could not parse \"where\" param as an object")
 121       end
 122     end
 123     @where = @where.with_indifferent_access
 124   end
 125
 126   def load_filters_param
 127     if params[:filters].is_a? Array
 128       @filters = params[:filters]
 129     elsif params[:filters].is_a? String
 130       begin
 131         @filters = Oj.load params[:filters]
 132         raise unless @filters.is_a? Array
 133       rescue
 134         raise ArgumentError.new("Could not parse \"filters\" param as an array")
 135       end
 136     end
 137   end
 138
 139   def find_objects_for_index
 140     @objects ||= model_class.readable_by(current_user)
 141     apply_where_limit_order_params
 142   end
 143
 144   def apply_where_limit_order_params
 145     if @filters.is_a? Array and @filters.any?
 146       cond_out = []
 147       param_out = []
 148       @filters.each do |attr, operator, operand|
 149         if !model_class.searchable_columns.index attr.to_s
 150           raise ArgumentError.new("Invalid attribute '#{attr}' in condition")
 151         end
 152         case operator.downcase
 153         when '=', '<', '<=', '>', '>=', 'like'
 154           if operand.is_a? String
 155             cond_out << "#{table_name}.#{attr} #{operator} ?"
 156             if (# any operator that operates on value rather than
 157                 # representation:
 158                 operator.match(/[<=>]/) and
 159                 model_class.attribute_column(attr).type == :datetime)
 160               operand = Time.parse operand
 161             end
 162             param_out << operand
 163           end
 164         when 'in'
 165           if operand.is_a? Array
 166             cond_out << "#{table_name}.#{attr} IN (?)"
 167             param_out << operand
 168           end
 169         end
 170       end
 171       if cond_out.any?
 172         @objects = @objects.where(cond_out.join(' AND '), *param_out)
 173       end
 174     end
 175     if @where.is_a? Hash and @where.any?
 176       conditions = ['1=1']
 177       @where.each do |attr,value|
 178         if attr == :any
 179           if value.is_a?(Array) and
 180               value.length == 2 and
 181               value[0] == 'contains' and
 182               model_class.columns.collect(&:name).index('name') then
 183             ilikes = []
 184             model_class.searchable_columns.each do |column|
 185               ilikes << "#{table_name}.#{column} ilike ?"
 186               conditions << "%#{value[1]}%"
 187             end
 188             if ilikes.any?
 189               conditions[0] << ' and (' + ilikes.join(' or ') + ')'
 190             end
 191           end
 192         elsif attr.to_s.match(/^[a-z][_a-z0-9]+$/) and
 193             model_class.columns.collect(&:name).index(attr.to_s)
 194           if value.nil?
 195             conditions[0] << " and #{table_name}.#{attr} is ?"
 196             conditions << nil
 197           elsif value.is_a? Array
 198             if value[0] == 'contains' and value.length == 2
 199               conditions[0] << " and #{table_name}.#{attr} like ?"
 200               conditions << "%#{value[1]}%"
 201             else
 202               conditions[0] << " and #{table_name}.#{attr} in (?)"
 203               conditions << value
 204             end
 205           elsif value.is_a? String or value.is_a? Fixnum or value == true or value == false
 206             conditions[0] << " and #{table_name}.#{attr}=?"
 207             conditions << value
 208           elsif value.is_a? Hash
 209             # Not quite the same thing as "equal?" but better than nothing?
 210             value.each do |k,v|
 211               if v.is_a? String
 212                 conditions[0] << " and #{table_name}.#{attr} ilike ?"
 213                 conditions << "%#{k}%#{v}%"
 214               end
 215             end
 216           end
 217         end
 218       end
 219       if conditions.length > 1
 220         conditions[0].sub!(/^1=1 and /, '')
 221         @objects = @objects.
 222           where(*conditions)
 223       end
 224     end
 225     if params[:limit]
 226       begin
 227         @objects = @objects.limit(params[:limit].to_i)
 228       rescue
 229         raise ArgumentError.new("Invalid value for limit parameter")
 230       end
 231     else
 232       @objects = @objects.limit(100)
 233     end
 234     orders = []
 235     if params[:order]
 236       params[:order].split(',').each do |order|
 237         attr, direction = order.strip.split " "
 238         direction ||= 'asc'
 239         if attr.match /^[a-z][_a-z0-9]+$/ and
 240             model_class.columns.collect(&:name).index(attr) and
 241             ['asc','desc'].index direction.downcase
 242           orders << "#{table_name}.#{attr} #{direction.downcase}"
 243         end
 244       end
 245     end
 246     if orders.empty?
 247       orders << "#{table_name}.modified_at desc"
 248     end
 249     @objects = @objects.order(orders.join ", ")
 250   end
 251
 252   def resource_attrs
 253     return @attrs if @attrs
 254     @attrs = params[resource_name]
 255     if @attrs.is_a? String
 256       @attrs = Oj.load @attrs, symbol_keys: true
 257     end
 258     unless @attrs.is_a? Hash
 259       message = "No #{resource_name}"
 260       if resource_name.index('_')
 261         message << " (or #{resource_name.camelcase(:lower)})"
 262       end
 263       message << " hash provided with request"
 264       raise ArgumentError.new(message)
 265     end
 266     %w(created_at modified_by_client_uuid modified_by_user_uuid modified_at).each do |x|
 267       @attrs.delete x.to_sym
 268     end
 269     @attrs = @attrs.symbolize_keys if @attrs.is_a? HashWithIndifferentAccess
 270     @attrs
 271   end
 272
 273   # Authentication
 274   def require_login
 275     if current_user
 276       true
 277     else
 278       respond_to do |format|
 279         format.json {
 280           render :json => { errors: ['Not logged in'] }.to_json, status: 401
 281         }
 282         format.html  {
 283           redirect_to '/auth/joshid'
 284         }
 285       end
 286       false
 287     end
 288   end
 289
 290   def admin_required
 291     unless current_user and current_user.is_admin
 292       render :json => { errors: ['Forbidden'] }.to_json, status: 403
 293     end
 294   end
 295
 296   def require_auth_scope_all
 297     require_login and require_auth_scope(['all'])
 298   end
 299
 300   def require_auth_scope(ok_scopes)
 301     unless current_api_client_auth_has_scope(ok_scopes)
 302       render :json => { errors: ['Forbidden'] }.to_json, status: 403
 303     end
 304   end
 305
 306   def thread_with_auth_info
 307     Thread.current[:request_starttime] = Time.now
 308     Thread.current[:api_url_base] = root_url.sub(/\/$/,'') + '/arvados/v1'
 309     begin
 310       user = nil
 311       api_client = nil
 312       api_client_auth = nil
 313       supplied_token =
 314         params[:api_token] ||
 315         params[:oauth_token] ||
 316         request.headers["Authorization"].andand.match(/OAuth2 ([a-z0-9]+)/).andand[1]
 317       if supplied_token
 318         api_client_auth = ApiClientAuthorization.
 319           includes(:api_client, :user).
 320           where('api_token=? and (expires_at is null or expires_at > CURRENT_TIMESTAMP)', supplied_token).
 321           first
 322         if api_client_auth.andand.user
 323           session[:user_id] = api_client_auth.user.id
 324           session[:api_client_uuid] = api_client_auth.api_client.andand.uuid
 325           session[:api_client_authorization_id] = api_client_auth.id
 326           user = api_client_auth.user
 327           api_client = api_client_auth.api_client
 328         end
 329       elsif session[:user_id]
 330         user = User.find(session[:user_id]) rescue nil
 331         api_client = ApiClient.
 332           where('uuid=?',session[:api_client_uuid]).
 333           first rescue nil
 334         if session[:api_client_authorization_id] then
 335           api_client_auth = ApiClientAuthorization.
 336             find session[:api_client_authorization_id]
 337         end
 338       end
 339       Thread.current[:api_client_ip_address] = remote_ip
 340       Thread.current[:api_client_authorization] = api_client_auth
 341       Thread.current[:api_client_uuid] = api_client.andand.uuid
 342       Thread.current[:api_client] = api_client
 343       Thread.current[:user] = user
 344       if api_client_auth
 345         api_client_auth.last_used_at = Time.now
 346         api_client_auth.last_used_by_ip_address = remote_ip
 347         api_client_auth.save validate: false
 348       end
 349       yield
 350     ensure
 351       Thread.current[:api_client_ip_address] = nil
 352       Thread.current[:api_client_authorization] = nil
 353       Thread.current[:api_client_uuid] = nil
 354       Thread.current[:api_client] = nil
 355       Thread.current[:user] = nil
 356     end
 357   end
 358   # /Authentication
 359
 360   def model_class
 361     controller_name.classify.constantize
 362   end
 363
 364   def resource_name             # params[] key used by client
 365     controller_name.singularize
 366   end
 367
 368   def table_name
 369     controller_name
 370   end
 371
 372   def find_object_by_uuid
 373     if params[:id] and params[:id].match /\D/
 374       params[:uuid] = params.delete :id
 375     end
 376     @where = { uuid: params[:uuid] }
 377     find_objects_for_index
 378     @object = @objects.first
 379   end
 380
 381   def reload_object_before_update
 382     # This is necessary to prevent an ActiveRecord::ReadOnlyRecord
 383     # error when updating an object which was retrieved using a join.
 384     if @object.andand.readonly?
 385       @object = model_class.find_by_uuid(@objects.first.uuid)
 386     end
 387   end
 388
 389   def self.accept_attribute_as_json(attr, force_class=nil)
 390     before_filter lambda { accept_attribute_as_json attr, force_class }
 391   end
 392   accept_attribute_as_json :properties, Hash
 393   accept_attribute_as_json :info, Hash
 394   def accept_attribute_as_json(attr, force_class)
 395     if params[resource_name] and resource_attrs.is_a? Hash
 396       if resource_attrs[attr].is_a? String
 397         resource_attrs[attr] = Oj.load(resource_attrs[attr],
 398                                        symbol_keys: false)
 399         if force_class and !resource_attrs[attr].is_a? force_class
 400           raise TypeError.new("#{resource_name}[#{attr.to_s}] must be a #{force_class.to_s}")
 401         end
 402       elsif resource_attrs[attr].is_a? Hash
 403         # Convert symbol keys to strings (in hashes provided by
 404         # resource_attrs)
 405         resource_attrs[attr] = resource_attrs[attr].
 406           with_indifferent_access.to_hash
 407       end
 408     end
 409   end
 410
 411   def render_list
 412     @object_list = {
 413       :kind  => "arvados##{(@response_resource_name || resource_name).camelize(:lower)}List",
 414       :etag => "",
 415       :self_link => "",
 416       :next_page_token => "",
 417       :next_link => "",
 418       :items => @objects.as_api_response(nil)
 419     }
 420     if @objects.respond_to? :except
 421       @object_list[:items_available] = @objects.except(:limit).count
 422     end
 423     render json: @object_list
 424   end
 425
 426   def remote_ip
 427     # Caveat: this is highly dependent on the proxy setup. YMMV.
 428     if request.headers.has_key?('HTTP_X_REAL_IP') then
 429       # We're behind a reverse proxy
 430       @remote_ip = request.headers['HTTP_X_REAL_IP']
 431     else
 432       # Hopefully, we are not!
 433       @remote_ip = request.env['REMOTE_ADDR']
 434     end
 435   end
 436
 437   def self._index_requires_parameters
 438     {
 439       filters: { type: 'array', required: false },
 440       where: { type: 'object', required: false },
 441       order: { type: 'string', required: false }
 442     }
 443   end
 444
 445   def client_accepts_plain_text_stream
 446     (request.headers['Accept'].split(' ') &
 447      ['text/plain', '*/*']).count > 0
 448   end
 449
 450   def render *opts
 451     if opts.first
 452       response = opts.first[:json]
 453       if response.is_a?(Hash) &&
 454           params[:_profile] &&
 455           Thread.current[:request_starttime]
 456         response[:_profile] = {
 457           request_time: Time.now - Thread.current[:request_starttime]
 458         }
 459       end
 460     end
 461     super *opts
 462   end
 463 end