1 files changed, 47 insertions, 0 deletions
diff --git a/app/models/protected_branch.rb b/app/models/protected_branch.rb
index 33cf046fa75..b7011d7afdf 100644
--- a/app/models/protected_branch.rb
+++ b/app/models/protected_branch.rb
@@ -8,4 +8,51 @@ class ProtectedBranch < ActiveRecord::Base
   def commit
     project.commit(self.name)
   end
+
+  # Returns all protected branches that match the given branch name.
+  # This realizes all records from the scope built up so far, and does
+  # _not_ return a relation.
+  #
+  # This method optionally takes in a list of `protected_branches` to search
+  # through, to avoid calling out to the database.
+  def self.matching(branch_name, protected_branches: nil)
+    (protected_branches || all).select { |protected_branch| protected_branch.matches?(branch_name) }
+  end
+
+  # Returns all branches (among the given list of branches [`Gitlab::Git::Branch`])
+  # that match the current protected branch.
+  def matching(branches)
+    branches.select { |branch| self.matches?(branch.name) }
+  end
+
+  # Checks if the protected branch matches the given branch name.
+  def matches?(branch_name)
+    return false if self.name.blank?
+
+    exact_match?(branch_name) || wildcard_match?(branch_name)
+  end
+
+  # Checks if this protected branch contains a wildcard
+  def wildcard?
+    self.name && self.name.include?('*')
+  end
+
+  protected
+
+  def exact_match?(branch_name)
+    self.name == branch_name
+  end
+
+  def wildcard_match?(branch_name)
+    wildcard_regex === branch_name
+  end
+
+  def wildcard_regex
+    @wildcard_regex ||= begin
+      name = self.name.gsub('*', 'STAR_DONT_ESCAPE')
+      quoted_name = Regexp.quote(name)
+      regex_string = quoted_name.gsub('STAR_DONT_ESCAPE', '.*?')
+      /\A#{regex_string}\z/
+    end
+  end
 end