Patches Rubydora::RestApiClient to not read file-like object

When adding or modifying datastream content.

Note: Previously, rubydora read the entire file content into a string
and passed the string to rest-client, so the file remained open.
Since rest-client closes the file, the changed methods alter the state
of passed in file/io objects.

Gemfile

@@ -4,3 +4,4 @@ gemspec
 
 gem 'jruby-openssl', :platform => :jruby
 gem 'activesupport', '< 5' if RUBY_VERSION < '2.2.2'
+gem 'rake', '< 12'

lib/rubydora/rest_api_client.rb

@@ -336,9 +336,8 @@ def add_datastream(options = {})
       file = query_options.delete(:content)
       content_type = query_options.delete(:content_type) || query_options[:mimeType] || file_content_type(file)
       run_hook :before_add_datastream, :pid => pid, :dsid => dsid, :file => file, :options => options
-      str = file.respond_to?(:read) ? file.read : file
       file.rewind if file.respond_to?(:rewind)
-      ProfileParser.parse_datastream_profile(client[datastream_url(pid, dsid, query_options)].post(str, :content_type => content_type.to_s, :multipart => true))
+      ProfileParser.parse_datastream_profile(client[datastream_url(pid, dsid, query_options)].post(file, :content_type => content_type.to_s, :multipart => true))
     rescue Exception => exception
       rescue_with_handler(exception) || raise
     end
@@ -361,9 +360,8 @@ def modify_datastream(options = {})
       end
 
       run_hook :before_modify_datastream, :pid => pid, :dsid => dsid, :file => file, :content_type => content_type, :options => options
-      str = file.respond_to?(:read) ? file.read : file
       file.rewind if file.respond_to?(:rewind)
-      ProfileParser.parse_datastream_profile(client[datastream_url(pid, dsid, query_options)].put(str, rest_client_options))
+      ProfileParser.parse_datastream_profile(client[datastream_url(pid, dsid, query_options)].put(file, rest_client_options))
 
     rescue Exception => exception
       rescue_with_handler(exception) || raise

spec/lib/rest_api_client_spec.rb

@@ -240,11 +240,11 @@ class MockRepository
       @mock_repository.add_datastream :pid => 'mypid', :dsid => 'aaa'
     end
     describe "when a file is passed" do
-      let!(:file) { StringIO.new('test', 'r') } # StringIO is a good stand it for a real File (it has read, rewind and close)
-      it "should rewind the file" do
+      let!(:file) { StringIO.new('test', 'r') } # StringIO is a good stand in for a real File (it has read, rewind and close)
+      it "closes the file" do
         RestClient::Request.any_instance.should_receive(:transmit) #stub transmit so that Request.execute can close the file we pass
         @mock_repository.add_datastream :pid => 'mypid', :dsid => 'aaa', :content=>file
-        lambda {file.read}.should_not raise_error
+        file.should be_closed
       end
       describe "and mimeType is not provided" do
         describe "and file responds to :content_type" do
@@ -282,10 +282,10 @@ class MockRepository
     end
     describe "when a file is passed" do
       let!(:file) { StringIO.new('test', 'r') } # StringIO is a good stand it for a real File (it has read, rewind and close)
-      it "should rewind the file" do
+      it "closes the file" do
         RestClient::Request.any_instance.should_receive(:transmit) #stub transmit so that Request.execute can close the file we pass
         @mock_repository.modify_datastream :pid => 'mypid', :dsid => 'aaa', :content=>file
-        lambda {file.read}.should_not raise_error
+        file.should be_closed
       end
       describe "and mimeType is not provided" do
         describe "and file responds to :content_type" do