apps/workbench/app/controllers/collections_controller.rb

   1 require "arvados/keep"
   2 require "uri"
   3
   4 class CollectionsController < ApplicationController
   5   include ActionController::Live
   6
   7   skip_around_filter :require_thread_api_token, if: proc { |ctrl|
   8     Rails.configuration.anonymous_user_token and
   9     'show' == ctrl.action_name
  10   }
  11   skip_around_filter(:require_thread_api_token,
  12                      only: [:show_file, :show_file_links])
  13   skip_before_filter(:find_object_by_uuid,
  14                      only: [:provenance, :show_file, :show_file_links])
  15   # We depend on show_file to display the user agreement:
  16   skip_before_filter :check_user_agreements, only: :show_file
  17   skip_before_filter :check_user_profile, only: :show_file
  18
  19   RELATION_LIMIT = 5
  20
  21   def show_pane_list
  22     panes = %w(Files Upload Provenance_graph Used_by Advanced)
  23     panes = panes - %w(Upload) unless (@object.editable? rescue false)
  24     panes
  25   end
  26
  27   def set_persistent
  28     case params[:value]
  29     when 'persistent', 'cache'
  30       persist_links = Link.filter([['owner_uuid', '=', current_user.uuid],
  31                                    ['link_class', '=', 'resources'],
  32                                    ['name', '=', 'wants'],
  33                                    ['tail_uuid', '=', current_user.uuid],
  34                                    ['head_uuid', '=', @object.uuid]])
  35       logger.debug persist_links.inspect
  36     else
  37       return unprocessable "Invalid value #{value.inspect}"
  38     end
  39     if params[:value] == 'persistent'
  40       if not persist_links.any?
  41         Link.create(link_class: 'resources',
  42                     name: 'wants',
  43                     tail_uuid: current_user.uuid,
  44                     head_uuid: @object.uuid)
  45       end
  46     else
  47       persist_links.each do |link|
  48         link.destroy || raise
  49       end
  50     end
  51
  52     respond_to do |f|
  53       f.json { render json: @object }
  54     end
  55   end
  56
  57   def index
  58     # API server index doesn't return manifest_text by default, but our
  59     # callers want it unless otherwise specified.
  60     @select ||= Collection.columns.map(&:name)
  61     base_search = Collection.select(@select)
  62     if params[:search].andand.length.andand > 0
  63       tags = Link.where(any: ['contains', params[:search]])
  64       @objects = (base_search.where(uuid: tags.collect(&:head_uuid)) |
  65                       base_search.where(any: ['contains', params[:search]])).
  66         uniq { |c| c.uuid }
  67     else
  68       if params[:limit]
  69         limit = params[:limit].to_i
  70       else
  71         limit = 100
  72       end
  73
  74       if params[:offset]
  75         offset = params[:offset].to_i
  76       else
  77         offset = 0
  78       end
  79
  80       @objects = base_search.limit(limit).offset(offset)
  81     end
  82     @links = Link.where(head_uuid: @objects.collect(&:uuid))
  83     @collection_info = {}
  84     @objects.each do |c|
  85       @collection_info[c.uuid] = {
  86         tag_links: [],
  87         wanted: false,
  88         wanted_by_me: false,
  89         provenance: [],
  90         links: []
  91       }
  92     end
  93     @links.each do |link|
  94       @collection_info[link.head_uuid] ||= {}
  95       info = @collection_info[link.head_uuid]
  96       case link.link_class
  97       when 'tag'
  98         info[:tag_links] << link
  99       when 'resources'
 100         info[:wanted] = true
 101         info[:wanted_by_me] ||= link.tail_uuid == current_user.uuid
 102       when 'provenance'
 103         info[:provenance] << link.name
 104       end
 105       info[:links] << link
 106     end
 107     @request_url = request.url
 108
 109     render_index
 110   end
 111
 112   def show_file_links
 113     Thread.current[:reader_tokens] = [params[:reader_token]]
 114     return if false.equal?(find_object_by_uuid)
 115     render layout: false
 116   end
 117
 118   def show_file
 119     # We pipe from arv-get to send the file to the user.  Before we start it,
 120     # we ask the API server if the file actually exists.  This serves two
 121     # purposes: it lets us return a useful status code for common errors, and
 122     # helps us figure out which token to provide to arv-get.
 123     # The order of searched tokens is important: because the anonymous user
 124     # token is passed along with every API request, we have to check it first.
 125     # Otherwise, it's impossible to know whether any other request succeeded
 126     # because of the reader token.
 127     coll = nil
 128     tokens = [(Rails.configuration.anonymous_user_token || nil),
 129               params[:reader_token],
 130               Thread.current[:arvados_api_token]].compact
 131     usable_token = find_usable_token(tokens) do
 132       coll = Collection.find(params[:uuid])
 133     end
 134     if usable_token.nil?
 135       # Response already rendered.
 136       return
 137     end
 138
 139     # If we are configured to use a keep-web server, just redirect to
 140     # the appropriate URL.
 141     if Rails.configuration.keep_web_url or
 142         Rails.configuration.keep_web_download_url
 143       opts = {}
 144       if usable_token == params[:reader_token]
 145         opts[:path_token] = usable_token
 146       elsif usable_token == Rails.configuration.anonymous_user_token
 147         # Don't pass a token at all
 148       else
 149         # We pass the current user's real token only if it's necessary
 150         # to read the collection.
 151         opts[:query_token] = usable_token
 152       end
 153       opts[:disposition] = params[:disposition] if params[:disposition]
 154       return redirect_to keep_web_url(params[:uuid], params[:file], opts)
 155     end
 156
 157     # No keep-web server available. Get the file data with arv-get,
 158     # and serve it through Rails.
 159
 160     file_name = params[:file].andand.sub(/^(\.\/|\/|)/, './')
 161     if file_name.nil? or not coll.manifest.has_file?(file_name)
 162       return render_not_found
 163     end
 164
 165     opts = params.merge(arvados_api_token: usable_token)
 166
 167     # Handle Range requests. Currently we support only 'bytes=0-....'
 168     if request.headers.include? 'HTTP_RANGE'
 169       if m = /^bytes=0-(\d+)/.match(request.headers['HTTP_RANGE'])
 170         opts[:maxbytes] = m[1]
 171         size = params[:size] || '*'
 172         self.response.status = 206
 173         self.response.headers['Content-Range'] = "bytes 0-#{m[1]}/#{size}"
 174       end
 175     end
 176
 177     ext = File.extname(params[:file])
 178     self.response.headers['Content-Type'] =
 179       Rack::Mime::MIME_TYPES[ext] || 'application/octet-stream'
 180     if params[:size]
 181       size = params[:size].to_i
 182       if opts[:maxbytes]
 183         size = [size, opts[:maxbytes].to_i].min
 184       end
 185       self.response.headers['Content-Length'] = size.to_s
 186     end
 187     self.response.headers['Content-Disposition'] = params[:disposition] if params[:disposition]
 188     begin
 189       file_enumerator(opts).each do |bytes|
 190         response.stream.write bytes
 191       end
 192     ensure
 193       response.stream.close
 194     end
 195   end
 196
 197   def sharing_scopes
 198     ["GET /arvados/v1/collections/#{@object.uuid}", "GET /arvados/v1/collections/#{@object.uuid}/", "GET /arvados/v1/keep_services/accessible"]
 199   end
 200
 201   def search_scopes
 202     begin
 203       ApiClientAuthorization.filter([['scopes', '=', sharing_scopes]]).results
 204     rescue ArvadosApiClient::AccessForbiddenException
 205       nil
 206     end
 207   end
 208
 209   def find_object_by_uuid
 210     if not Keep::Locator.parse params[:id]
 211       super
 212     end
 213   end
 214
 215   def show
 216     return super if !@object
 217
 218     @logs = []
 219
 220     if params["tab_pane"] == "Provenance_graph"
 221       @prov_svg = ProvenanceHelper::create_provenance_graph(@object.provenance, "provenance_svg",
 222                                                             {:request => request,
 223                                                              :direction => :bottom_up,
 224                                                              :combine_jobs => :script_only}) rescue nil
 225     end
 226
 227     if current_user
 228       if Keep::Locator.parse params["uuid"]
 229         @same_pdh = Collection.filter([["portable_data_hash", "=", @object.portable_data_hash]]).limit(20)
 230         if @same_pdh.results.size == 1
 231           redirect_to collection_path(@same_pdh[0]["uuid"])
 232           return
 233         end
 234         owners = @same_pdh.map(&:owner_uuid).to_a.uniq
 235         preload_objects_for_dataclass Group, owners
 236         preload_objects_for_dataclass User, owners
 237         uuids = @same_pdh.map(&:uuid).to_a.uniq
 238         preload_links_for_objects uuids
 239         render 'hash_matches'
 240         return
 241       else
 242         jobs_with = lambda do |conds|
 243           Job.limit(RELATION_LIMIT).where(conds)
 244             .results.sort_by { |j| j.finished_at || j.created_at }
 245         end
 246         @output_of = jobs_with.call(output: @object.portable_data_hash)
 247         @log_of = jobs_with.call(log: @object.portable_data_hash)
 248         @project_links = Link.limit(RELATION_LIMIT).order("modified_at DESC")
 249           .where(head_uuid: @object.uuid, link_class: 'name').results
 250         project_hash = Group.where(uuid: @project_links.map(&:tail_uuid)).to_hash
 251         @projects = project_hash.values
 252
 253         @permissions = Link.limit(RELATION_LIMIT).order("modified_at DESC")
 254           .where(head_uuid: @object.uuid, link_class: 'permission',
 255                  name: 'can_read').results
 256         @search_sharing = search_scopes
 257
 258         if params["tab_pane"] == "Used_by"
 259           @used_by_svg = ProvenanceHelper::create_provenance_graph(@object.used_by, "used_by_svg",
 260                                                                    {:request => request,
 261                                                                      :direction => :top_down,
 262                                                                      :combine_jobs => :script_only,
 263                                                                      :pdata_only => true}) rescue nil
 264         end
 265       end
 266     end
 267     super
 268   end
 269
 270   def sharing_popup
 271     @search_sharing = search_scopes
 272     render("sharing_popup.js", content_type: "text/javascript")
 273   end
 274
 275   helper_method :download_link
 276
 277   def download_link
 278     collections_url + "/download/#{@object.uuid}/#{@search_sharing.first.api_token}/"
 279   end
 280
 281   def share
 282     ApiClientAuthorization.create(scopes: sharing_scopes)
 283     sharing_popup
 284   end
 285
 286   def unshare
 287     search_scopes.each do |s|
 288       s.destroy
 289     end
 290     sharing_popup
 291   end
 292
 293   protected
 294
 295   def find_usable_token(token_list)
 296     # Iterate over every given token to make it the current token and
 297     # yield the given block.
 298     # If the block succeeds, return the token it used.
 299     # Otherwise, render an error response based on the most specific
 300     # error we encounter, and return nil.
 301     most_specific_error = [401]
 302     token_list.each do |api_token|
 303       begin
 304         # We can't load the corresponding user, because the token may not
 305         # be scoped for that.
 306         using_specific_api_token(api_token, load_user: false) do
 307           yield
 308           return api_token
 309         end
 310       rescue ArvadosApiClient::ApiError => error
 311         if error.api_status >= most_specific_error.first
 312           most_specific_error = [error.api_status, error]
 313         end
 314       end
 315     end
 316     case most_specific_error.shift
 317     when 401, 403
 318       redirect_to_login
 319     when 404
 320       render_not_found(*most_specific_error)
 321     end
 322     return nil
 323   end
 324
 325   def keep_web_url(uuid_or_pdh, file, opts)
 326     munged_id = uuid_or_pdh.sub('+', '-')
 327     fmt = {uuid_or_pdh: munged_id}
 328
 329     tmpl = Rails.configuration.keep_web_url
 330     if Rails.configuration.keep_web_download_url and
 331         (!tmpl or opts[:disposition] == 'attachment')
 332       # Prefer the attachment-only-host when we want an attachment
 333       # (and when there is no preview link configured)
 334       tmpl = Rails.configuration.keep_web_download_url
 335     elsif not Rails.configuration.trust_all_content
 336       check_uri = URI.parse(tmpl % fmt)
 337       if opts[:query_token] and
 338           not check_uri.host.start_with?(munged_id + "--") and
 339           not check_uri.host.start_with?(munged_id + ".")
 340         # We're about to pass a token in the query string, but
 341         # keep-web can't accept that safely at a single-origin URL
 342         # template (unless it's -attachment-only-host).
 343         tmpl = Rails.configuration.keep_web_download_url
 344         if not tmpl
 345           raise ArgumentError, "Download precluded by site configuration"
 346         end
 347         logger.warn("Using download link, even though inline content " \
 348                     "was requested: #{check_uri.to_s}")
 349       end
 350     end
 351
 352     if tmpl == Rails.configuration.keep_web_download_url
 353       # This takes us to keep-web's -attachment-only-host so there is
 354       # no need to add ?disposition=attachment.
 355       opts.delete :disposition
 356     end
 357
 358     uri = URI.parse(tmpl % fmt)
 359     uri.path += '/' unless uri.path.end_with? '/'
 360     if opts[:path_token]
 361       uri.path += 't=' + opts[:path_token] + '/'
 362     end
 363     uri.path += '_/'
 364     uri.path += URI.escape(file)
 365
 366     query = Hash[URI.decode_www_form(uri.query || '')]
 367     { query_token: 'api_token',
 368       disposition: 'disposition' }.each do |opt, param|
 369       if opts.include? opt
 370         query[param] = opts[opt]
 371       end
 372     end
 373     unless query.empty?
 374       uri.query = URI.encode_www_form(query)
 375     end
 376
 377     uri.to_s
 378   end
 379
 380   # Note: several controller and integration tests rely on stubbing
 381   # file_enumerator to return fake file content.
 382   def file_enumerator opts
 383     FileStreamer.new opts
 384   end
 385
 386   class FileStreamer
 387     include ArvadosApiClientHelper
 388     def initialize(opts={})
 389       @opts = opts
 390     end
 391     def each
 392       return unless @opts[:uuid] && @opts[:file]
 393
 394       env = Hash[ENV].dup
 395
 396       require 'uri'
 397       u = URI.parse(arvados_api_client.arvados_v1_base)
 398       env['ARVADOS_API_HOST'] = "#{u.host}:#{u.port}"
 399       env['ARVADOS_API_TOKEN'] = @opts[:arvados_api_token]
 400       env['ARVADOS_API_HOST_INSECURE'] = "true" if Rails.configuration.arvados_insecure_https
 401
 402       bytesleft = @opts[:maxbytes].andand.to_i || 2**16
 403       io = IO.popen([env, 'arv-get', "#{@opts[:uuid]}/#{@opts[:file]}"], 'rb')
 404       while bytesleft > 0 && (buf = io.read([bytesleft, 2**16].min)) != nil
 405         # shrink the bytesleft count, if we were given a maximum byte
 406         # count to read
 407         if @opts.include? :maxbytes
 408           bytesleft = bytesleft - buf.length
 409         end
 410         yield buf
 411       end
 412       io.close
 413       # "If ios is opened by IO.popen, close sets $?."
 414       # http://www.ruby-doc.org/core-2.1.3/IO.html#method-i-close
 415       Rails.logger.warn("#{@opts[:uuid]}/#{@opts[:file]}: #{$?}") if $? != 0
 416     end
 417   end
 418 end