Remove heading and trailing spaces from label's color and title

app/models/label.rb

@@ -21,6 +21,8 @@ class Label < ActiveRecord::Base
   has_many :issues, through: :label_links, source: :target, source_type: 'Issue'
   has_many :merge_requests, through: :label_links, source: :target, source_type: 'MergeRequest'
 
+  before_validation :strip_whitespace_from_title_and_color
+
   validates :color, color: true, allow_blank: false
 
   # Don't allow ',' for label titles
@@ -193,4 +195,8 @@ class Label < ActiveRecord::Base
   def sanitize_title(value)
     CGI.unescapeHTML(Sanitize.clean(value.to_s))
   end
+
+  def strip_whitespace_from_title_and_color
+    %w(color title).each { |attr| self[attr] = self[attr]&.strip }
+  end
 end

changelogs/unreleased/fix_spaces_in_label_title.yml

+---
+title: Remove heading and trailing spaces from label's color and title
+merge_request: 10603
+author: blackst0ne

spec/models/label_spec.rb

@@ -42,11 +42,27 @@ describe Label, models: true do
     end
   end
 
+  describe '#color' do
+    it 'strips color' do
+      label = described_class.new(color: '   #abcdef   ')
+      label.valid?
+
+      expect(label.color).to eq('#abcdef')
+    end
+  end
+
   describe '#title' do
     it 'sanitizes title' do
       label = described_class.new(title: '<b>foo & bar?</b>')
       expect(label.title).to eq('foo & bar?')
     end
+
+    it 'strips title' do
+      label = described_class.new(title: '   label   ')
+      label.valid?
+
+      expect(label.title).to eq('label')
+    end
   end
 
   describe 'priorization' do