Added PasswordField

docs/api-guide/fields.md

@@ -219,6 +219,10 @@ Corresponds to `django.forms.fields.IPAddressField` and `django.forms.fields.Gen
 - `protocol` Limits valid inputs to the specified protocol. Accepted values are 'both' (default), 'IPv4' or 'IPv6'. Matching is case insensitive.
 - `unpack_ipv4` Unpacks IPv4 mapped addresses like ::ffff:192.0.2.1. If this option is enabled that address would be unpacked to 192.0.2.1. Default is disabled. Can only be used when protocol is set to 'both'.
 
+## PasswordField
+
+A write-only field that doesn't trim whitespaces by default and sets the appropiate input style.
+
 ---
 
 # Numeric fields

rest_framework/fields.py

@@ -807,6 +807,19 @@ class IPAddressField(CharField):
         return super(IPAddressField, self).to_internal_value(data)
 
 
+class PasswordField(CharField):
+    """
+    A write-only subclass of Charfield that doesn't trim whitespaces by default
+    and sets the appropiate input style.
+    """
+
+    def __init__(self, **kwargs):
+        kwargs.setdefault('write_only', True)
+        kwargs.setdefault('trim_whitespace', False)
+        kwargs.setdefault('style', {'input_type': 'password'})
+        super(PasswordField, self).__init__(**kwargs)
+
+
 # Number types...
 
 class IntegerField(Field):

tests/test_fields.py

@@ -682,6 +682,39 @@ class TestIPv6AddressField(FieldValues):
     field = serializers.IPAddressField(protocol='IPv6')
 
 
+class TestPasswordField(FieldValues):
+    """
+    Valid and invalid values for `PasswordField`.
+    """
+    valid_inputs = {
+        '  password with spaces  ': '  password with spaces  ',
+        '    ': '    '
+    }
+    invalid_inputs = {
+        '': ['This field may not be blank.']
+    }
+    outputs = {
+        '  password with spaces  ': '  password with spaces  ',
+        '    ': '    '
+    }
+    field = serializers.PasswordField()
+
+    def test_trim_whitespace_default(self):
+        field = serializers.PasswordField()
+        assert field.to_internal_value(' abc ') == ' abc '
+
+    def test_trim_whitespace_enabled(self):
+        field = serializers.PasswordField(trim_whitespace=True)
+        assert field.to_internal_value(' abc ') == 'abc'
+
+    def test_disallow_blank_with_trim_whitespace(self):
+        field = serializers.PasswordField(allow_blank=False, trim_whitespace=True)
+
+        with pytest.raises(serializers.ValidationError) as exc_info:
+            field.run_validation('   ')
+        assert exc_info.value.detail == ['This field may not be blank.']
+
+
 class TestFilePathField(FieldValues):
     """
     Valid and invalid values for `FilePathField`