[api][webui] Moved backend call from Directory

Moved Backend::Connection call from Directory model to Backend::Api
BTW, some minor refactoring on Directory model

src/api/app/models/directory.rb

@@ -2,14 +2,11 @@ class Directory < ActiveXML::Node
   def self.hashed(opts)
     project = opts.delete :project
     package = opts.delete :package
-    path = Package.source_path(project, package, nil, opts)
-    d = nil
     begin
-      d = Backend::Connection.get(path).body
+      Xmlhash.parse(Backend::Api.file_list(project, package, opts))
     rescue ActiveXML::Transport::Error => e
-      logger.debug "fetching #{path} #{e.inspect}"
+      logger.debug "Error fetching source file list for #{project}/#{package} #{e.inspect}"
       return Xmlhash::XMLHash.new(error: e.summary)
     end
-    Xmlhash.parse(d)
   end
 end

src/api/lib/backend/api.rb

@@ -15,11 +15,18 @@ def self.write_attributes(project, package, login, xml, comment)
       Backend::Connection.put(path, xml)
     end
 
-    # Returns a file list (from src/api/app/controllers/build/file_controller.rb)
+    # Returns a file list of binaries (from src/api/app/controllers/build/file_controller.rb)
     def self.binary_files_list(project, repository, arch, package)
       Backend::Connection.get("/build/#{CGI.escape(project)}/#{CGI.escape(repository)}/#{CGI.escape(arch)}/#{CGI.escape(package)}").body
     end
 
+    # Returns a file list of the sources for a package
+    def self.file_list(project, package, options = {})
+      path = "/source/#{CGI.escape(project)}/#{CGI.escape(package)}"
+      path += "?#{options.to_query}" if options.present?
+      Backend::Connection.get(path).body
+    end
+
     # Returns the revisions list for a package / project using mrev (from src/api/app/helpers/validation_helper.rb)
     def self.revisions_list(project, package = nil)
       Backend::Connection.get("/source/#{CGI.escape(project)}/#{CGI.escape(package || '_project')}/_history?deleted=1&meta=1").body