services/api/app/controllers/application_controller.rb

   1 class ApplicationController < ActionController::Base
   2   include CurrentApiClient
   3
   4   protect_from_forgery
   5   around_filter :thread_with_auth_info, :except => [:render_error, :render_not_found]
   6
   7   before_filter :remote_ip
   8   before_filter :require_auth_scope_all, :except => :render_not_found
   9   before_filter :catch_redirect_hint
  10
  11   before_filter :load_where_param, :only => :index
  12   before_filter :find_objects_for_index, :only => :index
  13   before_filter :find_object_by_uuid, :except => [:index, :create]
  14
  15   attr_accessor :resource_attrs
  16
  17   def index
  18     @objects.uniq!(&:id)
  19     if params[:eager] and params[:eager] != '0' and params[:eager] != 0 and params[:eager] != ''
  20       @objects.each(&:eager_load_associations)
  21     end
  22     render_list
  23   end
  24
  25   def show
  26     if @object
  27       render json: @object.as_api_response
  28     else
  29       render_not_found("object not found")
  30     end
  31   end
  32
  33   def create
  34     @object = model_class.new resource_attrs
  35     @object.save
  36     show
  37   end
  38
  39   def update
  40     attrs_to_update = resource_attrs.reject { |k,v|
  41       [:kind, :etag, :href].index k
  42     }
  43     if @object.update_attributes attrs_to_update
  44       show
  45     else
  46       render json: { errors: @object.errors.full_messages }, status: 422
  47     end
  48   end
  49
  50   def destroy
  51     @object.destroy
  52     show
  53   end
  54
  55   def catch_redirect_hint
  56     if !current_user
  57       if params.has_key?('redirect_to') then
  58         session[:redirect_to] = params[:redirect_to]
  59       end
  60     end
  61   end
  62
  63   begin
  64     rescue_from Exception,
  65     :with => :render_error
  66     rescue_from ActiveRecord::RecordNotFound,
  67     :with => :render_not_found
  68     rescue_from ActionController::RoutingError,
  69     :with => :render_not_found
  70     rescue_from ActionController::UnknownController,
  71     :with => :render_not_found
  72     rescue_from AbstractController::ActionNotFound,
  73     :with => :render_not_found
  74     rescue_from ArvadosModel::PermissionDeniedError,
  75     :with => :render_error
  76   end
  77
  78   def render_error(e)
  79     logger.error e.inspect
  80     logger.error e.backtrace.collect { |x| x + "\n" }.join('') if e.backtrace
  81     if @object and @object.errors and @object.errors.full_messages and not @object.errors.full_messages.empty?
  82       errors = @object.errors.full_messages
  83     else
  84       errors = [e.inspect]
  85     end
  86     status = e.respond_to?(:http_status) ? e.http_status : 422
  87     render json: { errors: errors }, status: status
  88   end
  89
  90   def render_not_found(e=ActionController::RoutingError.new("Path not found"))
  91     logger.error e.inspect
  92     render json: { errors: ["Path not found"] }, status: 404
  93   end
  94
  95   protected
  96
  97   def load_where_param
  98     if params[:where].nil? or params[:where] == ""
  99       @where = {}
 100     elsif params[:where].is_a? Hash
 101       @where = params[:where]
 102     elsif params[:where].is_a? String
 103       begin
 104         @where = Oj.load(params[:where])
 105       rescue
 106         raise ArgumentError.new("Could not parse \"where\" param as an object")
 107       end
 108     end
 109   end
 110
 111   def find_objects_for_index
 112     uuid_list = [current_user.uuid, *current_user.groups_i_can(:read)]
 113     sanitized_uuid_list = uuid_list.
 114       collect { |uuid| model_class.sanitize(uuid) }.join(', ')
 115     or_references_me = ''
 116     if model_class == Link and current_user
 117       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))"
 118     end
 119     @objects ||= model_class.
 120       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'").
 121       where("?=? OR #{table_name}.owner_uuid in (?) OR #{table_name}.uuid=? OR permissions.head_uuid IS NOT NULL #{or_references_me}",
 122             true, current_user.is_admin,
 123             uuid_list,
 124             current_user.uuid)
 125     if !@where.empty?
 126       conditions = ['1=1']
 127       @where.each do |attr,value|
 128         if attr == 'any' or attr == :any
 129           if value.is_a?(Array) and
 130               value[0] == 'contains' and
 131               model_class.columns.collect(&:name).index('name') then
 132             conditions[0] << " and #{table_name}.name ilike ?"
 133             conditions << "%#{value[1]}%"
 134           end
 135         elsif attr.to_s.match(/^[a-z][_a-z0-9]+$/) and
 136             model_class.columns.collect(&:name).index(attr.to_s)
 137           if value.nil?
 138             conditions[0] << " and #{table_name}.#{attr} is ?"
 139             conditions << nil
 140           elsif value.is_a? Array
 141             conditions[0] << " and #{table_name}.#{attr} in (?)"
 142             conditions << value
 143           elsif value.is_a? String or value.is_a? Fixnum or value == true or value == false
 144             conditions[0] << " and #{table_name}.#{attr}=?"
 145             conditions << value
 146           elsif value.is_a? Hash
 147             # Not quite the same thing as "equal?" but better than nothing?
 148             value.each do |k,v|
 149               if v.is_a? String
 150                 conditions[0] << " and #{table_name}.#{attr} ilike ?"
 151                 conditions << "%#{k}%#{v}%"
 152               end
 153             end
 154           end
 155         end
 156       end
 157       if conditions.length > 1
 158         conditions[0].sub!(/^1=1 and /, '')
 159         @objects = @objects.
 160           where(*conditions)
 161       end
 162     end
 163     if params[:limit]
 164       begin
 165         @objects = @objects.limit(params[:limit].to_i)
 166       rescue
 167         raise ArgumentError.new("Invalid value for limit parameter")
 168       end
 169     else
 170       @objects = @objects.limit(100)
 171     end
 172     orders = []
 173     if params[:order]
 174       params[:order].split(',').each do |order|
 175         attr, direction = order.strip.split " "
 176         direction ||= 'asc'
 177         if attr.match /^[a-z][_a-z0-9]+$/ and
 178             model_class.columns.collect(&:name).index(attr) and
 179             ['asc','desc'].index direction.downcase
 180           orders << "#{table_name}.#{attr} #{direction.downcase}"
 181         end
 182       end
 183     end
 184     if orders.empty?
 185       orders << "#{table_name}.modified_at desc"
 186     end
 187     @objects = @objects.order(orders.join ", ")
 188   end
 189
 190   def resource_attrs
 191     return @attrs if @attrs
 192     @attrs = params[resource_name]
 193     if @attrs.is_a? String
 194       @attrs = Oj.load @attrs
 195     end
 196     unless @attrs.is_a? Hash
 197       message = "No #{resource_name}"
 198       if resource_name.index('_')
 199         message << " (or #{resource_name.camelcase(:lower)})"
 200       end
 201       message << " hash provided with request"
 202       raise ArgumentError.new(message)
 203     end
 204     %w(created_at modified_by_client_uuid modified_by_user_uuid modified_at).each do |x|
 205       @attrs.delete x
 206     end
 207     @attrs
 208   end
 209
 210   # Authentication
 211   def require_login
 212     if current_user
 213       true
 214     else
 215       respond_to do |format|
 216         format.json {
 217           render :json => { errors: ['Not logged in'] }.to_json, status: 401
 218         }
 219         format.html  {
 220           redirect_to '/auth/joshid'
 221         }
 222       end
 223       false
 224     end
 225   end
 226
 227   def admin_required
 228     unless current_user and current_user.is_admin
 229       render :json => { errors: ['Forbidden'] }.to_json, status: 403
 230     end
 231   end
 232
 233   def require_auth_scope_all
 234     require_login and require_auth_scope(['all'])
 235   end
 236
 237   def require_auth_scope(ok_scopes)
 238     unless current_api_client_auth_has_scope(ok_scopes)
 239       render :json => { errors: ['Forbidden'] }.to_json, status: 403
 240     end
 241   end
 242
 243   def thread_with_auth_info
 244     Thread.current[:api_url_base] = root_url.sub(/\/$/,'') + '/arvados/v1'
 245     begin
 246       user = nil
 247       api_client = nil
 248       api_client_auth = nil
 249       supplied_token =
 250         params[:api_token] ||
 251         params[:oauth_token] ||
 252         request.headers["Authorization"].andand.match(/OAuth2 ([a-z0-9]+)/).andand[1]
 253       if supplied_token
 254         api_client_auth = ApiClientAuthorization.
 255           includes(:api_client, :user).
 256           where('api_token=? and (expires_at is null or expires_at > now())', supplied_token).
 257           first
 258         if api_client_auth.andand.user
 259           session[:user_id] = api_client_auth.user.id
 260           session[:api_client_uuid] = api_client_auth.api_client.andand.uuid
 261           session[:api_client_authorization_id] = api_client_auth.id
 262           user = api_client_auth.user
 263           api_client = api_client_auth.api_client
 264         end
 265       elsif session[:user_id]
 266         user = User.find(session[:user_id]) rescue nil
 267         api_client = ApiClient.
 268           where('uuid=?',session[:api_client_uuid]).
 269           first rescue nil
 270         if session[:api_client_authorization_id] then
 271           api_client_auth = ApiClientAuthorization.
 272             find session[:api_client_authorization_id]
 273         end
 274       end
 275       Thread.current[:api_client_ip_address] = remote_ip
 276       Thread.current[:api_client_authorization] = api_client_auth
 277       Thread.current[:api_client_uuid] = api_client.andand.uuid
 278       Thread.current[:api_client] = api_client
 279       Thread.current[:user] = user
 280       if api_client_auth
 281         api_client_auth.last_used_at = Time.now
 282         api_client_auth.last_used_by_ip_address = remote_ip
 283         api_client_auth.save validate: false
 284       end
 285       yield
 286     ensure
 287       Thread.current[:api_client_ip_address] = nil
 288       Thread.current[:api_client_authorization] = nil
 289       Thread.current[:api_client_uuid] = nil
 290       Thread.current[:api_client] = nil
 291       Thread.current[:user] = nil
 292     end
 293   end
 294   # /Authentication
 295
 296   def model_class
 297     controller_name.classify.constantize
 298   end
 299
 300   def resource_name             # params[] key used by client
 301     controller_name.singularize
 302   end
 303
 304   def table_name
 305     controller_name
 306   end
 307
 308   def find_object_by_uuid
 309     if params[:id] and params[:id].match /\D/
 310       params[:uuid] = params.delete :id
 311     end
 312     @object = model_class.where('uuid=?', params[:uuid]).first
 313   end
 314
 315   def self.accept_attribute_as_json(attr, force_class=nil)
 316     before_filter lambda { accept_attribute_as_json attr, force_class }
 317   end
 318   def accept_attribute_as_json(attr, force_class)
 319     if params[resource_name].is_a? Hash
 320       if params[resource_name][attr].is_a? String
 321         params[resource_name][attr] = Oj.load params[resource_name][attr]
 322         if force_class and !params[resource_name][attr].is_a? force_class
 323           raise TypeError.new("#{resource_name}[#{attr.to_s}] must be a #{force_class.to_s}")
 324         end
 325       end
 326     end
 327   end
 328
 329   def render_list
 330     @object_list = {
 331       :kind  => "arvados##{(@response_resource_name || resource_name).camelize(:lower)}List",
 332       :etag => "",
 333       :self_link => "",
 334       :next_page_token => "",
 335       :next_link => "",
 336       :items => @objects.as_api_response(nil)
 337     }
 338     render json: @object_list
 339   end
 340
 341   def remote_ip
 342     # Caveat: this is highly dependent on the proxy setup. YMMV.
 343     if request.headers.has_key?('HTTP_X_REAL_IP') then
 344       # We're behind a reverse proxy
 345       @remote_ip = request.headers['HTTP_X_REAL_IP']
 346     else
 347       # Hopefully, we are not!
 348       @remote_ip = request.env['REMOTE_ADDR']
 349     end
 350   end
 351
 352   def self._index_requires_parameters
 353     {
 354       where: { type: 'object', required: false },
 355       order: { type: 'string', required: false }
 356     }
 357   end
 358
 359   def client_accepts_plain_text_stream
 360     (request.headers['Accept'].split(' ') &
 361      ['text/plain', '*/*']).count > 0
 362   end
 363 end