Backport CE changes from draft_notes addition in EE

1 files changed, 81 insertions, 0 deletions

diff --git a/app/models/concerns/diff_positionable_note.rb b/app/models/concerns/diff_positionable_note.rb
new file mode 100644
index 00000000000..b61bf29e6ad
--- /dev/null
+++ b/app/models/concerns/diff_positionable_note.rb
@@ -0,0 +1,81 @@
+# frozen_string_literal: true
+module DiffPositionableNote
+  extend ActiveSupport::Concern
+
+  included do
+    before_validation :set_original_position, on: :create
+    before_validation :update_position, on: :create, if: :on_text?
+
+    serialize :original_position, Gitlab::Diff::Position # rubocop:disable Cop/ActiveRecordSerialize
+    serialize :position, Gitlab::Diff::Position # rubocop:disable Cop/ActiveRecordSerialize
+    serialize :change_position, Gitlab::Diff::Position # rubocop:disable Cop/ActiveRecordSerialize
+  end
+
+  %i(original_position position change_position).each do |meth|
+    define_method "#{meth}=" do |new_position|
+      if new_position.is_a?(String)
+        new_position = JSON.parse(new_position) rescue nil
+      end
+
+      if new_position.is_a?(Hash)
+        new_position = new_position.with_indifferent_access
+        new_position = Gitlab::Diff::Position.new(new_position)
+      end
+
+      return if new_position == read_attribute(meth)
+
+      super(new_position)
+    end
+  end
+
+  def on_text?
+    position&.position_type == "text"
+  end
+
+  def on_image?
+    position&.position_type == "image"
+  end
+
+  def supported?
+    for_commit? || self.noteable.has_complete_diff_refs?
+  end
+
+  def active?(diff_refs = nil)
+    return false unless supported?
+    return true if for_commit?
+
+    diff_refs ||= noteable.diff_refs
+
+    self.position.diff_refs == diff_refs
+  end
+
+  def set_original_position
+    return unless position
+
+    self.original_position = self.position.dup unless self.original_position&.complete?
+  end
+
+  def update_position
+    return unless supported?
+    return if for_commit?
+
+    return if active?
+    return unless position
+
+    tracer = Gitlab::Diff::PositionTracer.new(
+      project: self.project,
+      old_diff_refs: self.position.diff_refs,
+      new_diff_refs: self.noteable.diff_refs,
+      paths: self.position.paths
+    )
+
+    result = tracer.trace(self.position)
+    return unless result
+
+    if result[:outdated]
+      self.change_position = result[:position]
+    else
+      self.position = result[:position]
+    end
+  end
+end