X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/b91db14a4dced9d6ea124e86be3c796e6f2c8e8c..eb1c9afa9a92c1506e5d4d1161b6e74d919e8f00:/services/api/app/controllers/arvados/v1/links_controller.rb

diff --git a/services/api/app/controllers/arvados/v1/links_controller.rb b/services/api/app/controllers/arvados/v1/links_controller.rb
index 188ecfc1a0..862582aa9c 100644
--- a/services/api/app/controllers/arvados/v1/links_controller.rb
+++ b/services/api/app/controllers/arvados/v1/links_controller.rb
@@ -1,8 +1,13 @@
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
 class Arvados::V1::LinksController < ApplicationController
 
   def check_uuid_kind uuid, kind
     if kind and ArvadosModel::resource_class_for_uuid(uuid).andand.kind != kind
-      render :json => { errors: ["'#{kind}' does not match uuid '#{uuid}', expected '#{ArvadosModel::resource_class_for_uuid(uuid).andand.kind}'"] }.to_json, status: 422
+      send_error("'#{kind}' does not match uuid '#{uuid}', expected '#{ArvadosModel::resource_class_for_uuid(uuid).andand.kind}'",
+                 status: 422)
       nil
     else
       true
@@ -18,8 +23,44 @@ class Arvados::V1::LinksController < ApplicationController
     super
   end
 
+  def get_permissions
+    if current_user.andand.can?(manage: @object)
+      # find all links and return them
+      @objects = Link.where(link_class: "permission",
+                            head_uuid: params[:uuid])
+      @offset = 0
+      @limit = @objects.count
+      render_list
+    else
+      render :json => { errors: ['Forbidden'] }.to_json, status: 403
+    end
+  end
+
   protected
 
+  def find_object_by_uuid
+    if action_name == 'get_permissions'
+      # get_permissions accepts a UUID for any kind of object.
+      @object = ArvadosModel::resource_class_for_uuid(params[:uuid])
+        .readable_by(*@read_users)
+        .where(uuid: params[:uuid])
+        .first
+    else
+      super
+      if @object.nil?
+        # Normally group permission links are not readable_by users.
+        # Make an exception for users with permission to manage the group.
+        # FIXME: Solve this more generally - see the controller tests.
+        link = Link.find_by_uuid(params[:uuid])
+        if (not link.nil?) and
+            (link.link_class == "permission") and
+            (@read_users.any? { |u| u.can?(manage: link.head_uuid) })
+          @object = link
+        end
+      end
+    end
+  end
+
   # Overrides ApplicationController load_where_param
   def load_where_param
     super