add Password field (#109)

docs/fields.md

@@ -66,6 +66,11 @@ For example: `username = typesystem.String(max_length=100)`
 Validates multi-line strings. Takes the same arguments as `String`.
 Represented in HTML forms as a `<textarea>`.
 
+### Password
+
+Similar to `String` and takes the same arguments.
+Represented in HTML forms as a `<input type="password">`.
+
 ## Boolean data types
 
 ### Boolean

tests/test_fields.py

@@ -17,6 +17,7 @@
     Integer,
     Number,
     Object,
+    Password,
     String,
     Time,
     Union,
@@ -832,3 +833,9 @@ def test_validation_error_is_hashable():
     validator = Integer()
     _, error = validator.validate_or_error("abc")
     hash(error)
+
+
+def test_password():
+    validator = Password()
+    value, _ = validator.validate_or_error("secret")
+    assert value == "secret"

tests/test_forms.py

@@ -9,6 +9,7 @@ class Contact(typesystem.Schema):
     b = typesystem.String(max_length=10)
     c = typesystem.Text()
     d = typesystem.Choice(choices=[("abc", "Abc"), ("def", "Def"), ("ghi", "Ghi")])
+    password = typesystem.Password()
 
 
 forms = typesystem.Jinja2Forms(package="typesystem")
@@ -23,13 +24,11 @@ def test_form_rendering():
     assert html.count('<input type="text" ') == 1
     assert html.count("<textarea ") == 1
     assert html.count("<select ") == 1
+    assert html.count('<input type="password" ') == 1
 
 
 def test_password_rendering():
-    class PasswordForm(typesystem.Schema):
-        password = typesystem.String(format="password")
-
-    form = forms.Form(PasswordForm, values={"password": "secret"})
+    form = forms.Form(Contact, values={"password": "secret"})
     html = str(form)
     assert "secret" not in html
 

typesystem/__init__.py

@@ -13,6 +13,7 @@
     Integer,
     Number,
     Object,
+    Password,
     String,
     Text,
     Time,
@@ -40,6 +41,7 @@
     "Float",
     "Number",
     "Object",
+    "Password",
     "Reference",
     "String",
     "Text",

typesystem/fields.py

@@ -765,3 +765,8 @@ def validate(self, value: typing.Any, strict: bool = False) -> typing.Any:
 class UUID(String):
     def __init__(self, **kwargs: typing.Any) -> None:
         super().__init__(format="uuid", **kwargs)
+
+
+class Password(String):
+    def __init__(self, **kwargs: typing.Any) -> None:
+        super().__init__(format="password", **kwargs)