Support custom regex for validation via config (#84)

* Support custom regex for validation via config

* Add test cases

* Format

lib/goal.ex

@@ -726,6 +726,9 @@ defmodule Goal do
       {:format, %Regex{} = regex}, acc ->
         validate_format(acc, field, regex)
 
+      {:format, key}, acc when is_atom(key) ->
+        validate_format(acc, field, Goal.Regex.custom(key))
+
       {:less_than, integer}, acc ->
         validate_number(acc, field, less_than: integer)
 

lib/goal/regex.ex

@@ -38,4 +38,10 @@ defmodule Goal.Regex do
       ~r/^(http:\/\/www\.|https:\/\/www\.|http:\/\/|https:\/\/)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/
     )
   end
+
+  @doc false
+  @spec custom(atom()) :: Regex.t()
+  def custom(key) when is_atom(key) do
+    Application.get_env(:goal, String.to_atom("#{key}_regex"), nil)
+  end
 end

test/goal/regex_test.exs

@@ -116,4 +116,15 @@ defmodule Goal.RegexTest do
       Application.delete_env(:goal, :url_regex)
     end
   end
+
+  describe "custom/1" do
+    test "with a custom regex" do
+      Application.put_env(:goal, :custom_regex, ~r/^[[:alpha:]]+$/)
+
+      assert String.match?("abc", Regex.custom(:custom)) == true
+      assert String.match?("123", Regex.custom(:custom)) == false
+
+      Application.delete_env(:goal, :custom_regex)
+    end
+  end
 end

test/goal_test.exs

@@ -24,6 +24,7 @@ defmodule GoalTest do
     optional(:type, :string, squish: true)
     optional(:age, :integer, min: 0, max: 120)
     optional(:gender, :enum, values: ["female", "male", "non-binary"])
+    optional(:hash, :string, format: :hash)
 
     required :car, :map do
       optional(:name, :string, min: 3, max: 20)
@@ -71,6 +72,7 @@ defmodule GoalTest do
                type: [type: :string, squish: true],
                age: [type: :integer, min: 0, max: 120],
                gender: [type: :enum, values: ["female", "male", "non-binary"]],
+               hash: [type: :string, format: :hash],
                car: [
                  type: :map,
                  required: true,
@@ -596,6 +598,24 @@ defmodule GoalTest do
       assert errors_on(changeset_2) == %{id: ["has invalid format"]}
     end
 
+    test "string, format: custom regex" do
+      Application.put_env(:goal, :custom_regex, ~r/^[a-fA-F0-9]{40}$/)
+
+      schema = %{hash: [type: :string, format: :custom]}
+
+      hash = :crypto.hash(:sha, "test") |> Base.encode16()
+      data_1 = %{"hash" => hash}
+      data_2 = %{"hash" => "notahash"}
+
+      changeset_1 = Goal.build_changeset(schema, data_1)
+      changeset_2 = Goal.build_changeset(schema, data_2)
+
+      assert changes_on(changeset_1) == %{hash: hash}
+      assert errors_on(changeset_2) == %{hash: ["has invalid format"]}
+
+      Application.delete_env(:goal, :custom_regex)
+    end
+
     test "integer, is: 5" do
       schema = %{age: [type: :integer, is: 5]}