Merge branch 'bvl-codeowners-file-ce' into 'master'

Port changes for CODEOWNERS to CE

See merge request gitlab-org/gitlab-ce!21309

1 files changed, 53 insertions, 0 deletions

diff --git a/lib/gitlab/user_extractor.rb b/lib/gitlab/user_extractor.rb
new file mode 100644
index 00000000000..3ede0a5b5e6
--- /dev/null
+++ b/lib/gitlab/user_extractor.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+# This class extracts all users found in a piece of text by the username or the
+# email adress
+
+module Gitlab
+  class UserExtractor
+    # Not using `Devise.email_regexp` to filter out any chars that an email
+    # does not end with and not pinning the email to a start of end of a string.
+    EMAIL_REGEXP = /(?<email>([^@\s]+@[^@\s]+(?<!\W)))/
+    USERNAME_REGEXP = User.reference_pattern
+
+    def initialize(text)
+      @text = text
+    end
+
+    def users
+      return User.none unless @text.present?
+
+      @users ||= User.from("(#{union.to_sql}) users")
+    end
+
+    def usernames
+      matches[:usernames]
+    end
+
+    def emails
+      matches[:emails]
+    end
+
+    def references
+      @references ||= matches.values.flatten
+    end
+
+    def matches
+      @matches ||= {
+        emails: @text.scan(EMAIL_REGEXP).flatten.uniq,
+        usernames: @text.scan(USERNAME_REGEXP).flatten.uniq
+      }
+    end
+
+    private
+
+    def union
+      relations = []
+
+      relations << User.by_any_email(emails) if emails.any?
+      relations << User.by_username(usernames) if usernames.any?
+
+      Gitlab::SQL::Union.new(relations)
+    end
+  end
+end