Merge branch 'issue_23548_dev' into 'master'

disable markdown in comments when referencing disabled features

fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/23548

This MR prevents the following references when tool is disabled:

- issues
- snippets
- commits - when repo is disabled
- commit range - when repo is disabled
- milestones

This MR does not prevent references to repository files, since they are just markdown links and don't leak
information.

See merge request !2011

Signed-off-by: Rémy Coutable <remy@rymai.me>

1 files changed, 30 insertions, 22 deletions

diff --git a/app/models/issue.rb b/app/models/issue.rb
index 4f02b02c488..adbca510ef7 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -250,29 +250,9 @@ class Issue < ActiveRecord::Base
   # Returns `true` if the current issue can be viewed by either a logged in User
   # or an anonymous user.
   def visible_to_user?(user = nil)
-    user ? readable_by?(user) : publicly_visible?
-  end
-
-  # Returns `true` if the given User can read the current Issue.
-  def readable_by?(user)
-    if user.admin?
-      true
-    elsif project.owner == user
-      true
-    elsif confidential?
-      author == user ||
-        assignee == user ||
-        project.team.member?(user, Gitlab::Access::REPORTER)
-    else
-      project.public? ||
-        project.internal? && !user.external? ||
-        project.team.member?(user)
-    end
-  end
+    return false unless project.feature_available?(:issues, user)
 
-  # Returns `true` if this Issue is visible to everybody.
-  def publicly_visible?
-    project.public? && !confidential?
+    user ? readable_by?(user) : publicly_visible?
   end
 
   def overdue?
@@ -297,4 +277,32 @@ class Issue < ActiveRecord::Base
       end
     end
   end
+
+  private
+
+  # Returns `true` if the given User can read the current Issue.
+  #
+  # This method duplicates the same check of issue_policy.rb
+  # for performance reasons, check commit: 002ad215818450d2cbbc5fa065850a953dc7ada8
+  # Make sure to sync this method with issue_policy.rb
+  def readable_by?(user)
+    if user.admin?
+      true
+    elsif project.owner == user
+      true
+    elsif confidential?
+      author == user ||
+        assignee == user ||
+        project.team.member?(user, Gitlab::Access::REPORTER)
+    else
+      project.public? ||
+        project.internal? && !user.external? ||
+        project.team.member?(user)
+    end
+  end
+
+  # Returns `true` if this Issue is visible to everybody.
+  def publicly_visible?
+    project.public? && !confidential?
+  end
 end