tighten up validate_value logic and allow string promotion to integers

wsme/tests/test_types.py

@@ -249,7 +249,7 @@ class TestTypes(unittest.TestCase):
         assert value.a is types.Unset
 
     def test_validate_dict(self):
-        types.validate_value({int: str}, {1: '1', 5: '5'})
+        assert types.validate_value({int: str}, {1: '1', 5: '5'})
 
         try:
             types.validate_value({int: str}, [])
@@ -257,11 +257,7 @@ class TestTypes(unittest.TestCase):
         except ValueError:
             pass
 
-        try:
-            types.validate_value({int: str}, {'1': '1', 5: '5'})
-            assert False, "No ValueError raised"
-        except ValueError:
-            pass
+        assert types.validate_value({int: str}, {'1': '1', 5: '5'})
 
         try:
             types.validate_value({int: str}, {1: 1, 5: '5'})
@@ -273,6 +269,21 @@ class TestTypes(unittest.TestCase):
         self.assertEqual(types.validate_value(float, 1), 1.0)
         self.assertEqual(types.validate_value(float, '1'), 1.0)
         self.assertEqual(types.validate_value(float, 1.1), 1.1)
+        try:
+            types.validate_value(float, [])
+            assert False, "No ValueError raised"
+        except ValueError:
+            pass
+
+    def test_validate_int(self):
+        self.assertEqual(types.validate_value(int, 1), 1)
+        self.assertEqual(types.validate_value(int, '1'), 1)
+        self.assertEqual(types.validate_value(int, six.u('1')), 1)
+        try:
+            types.validate_value(int, 1.1)
+            assert False, "No ValueError raised"
+        except ValueError:
+            pass
 
     def test_register_invalid_array(self):
         self.assertRaises(ValueError, types.register_type, [])

wsme/types.py

@@ -178,6 +178,8 @@ pod_types = six.integer_types + (
 dt_types = (datetime.date, datetime.time, datetime.datetime)
 extra_types = (binary, decimal.Decimal)
 native_types = pod_types + dt_types + extra_types
+# The types for which we allow promotion to certain numbers.
+_promotable_types = six.integer_types + (text, bytes)
 
 
 def iscomplex(datatype):
@@ -194,40 +196,49 @@ def isdict(datatype):
 
 
 def validate_value(datatype, value):
+    if value in (Unset, None):
+        return value
+
+    # Try to promote the data type to one of our complex types.
+    if isinstance(datatype, list):
+        datatype = ArrayType(datatype[0])
+    elif isinstance(datatype, dict):
+        datatype = DictType(*list(datatype.items())[0])
+
+    # If the datatype has its own validator, use that.
     if hasattr(datatype, 'validate'):
         return datatype.validate(value)
-    else:
-        if value in (Unset, None):
-            return value
 
-        if isinstance(datatype, list):
-            datatype = ArrayType(datatype[0])
-        if isinstance(datatype, dict):
-            datatype = DictType(*list(datatype.items())[0])
-        if isarray(datatype):
-            datatype.validate(value)
-        elif isdict(datatype):
-            datatype.validate(value)
-        elif datatype in six.integer_types:
-            if not isinstance(value, six.integer_types):
-                raise ValueError(
-                    "Wrong type. Expected an integer, got '%s'" % (
-                        type(value)
-                    ))
-        elif datatype is text and isinstance(value, bytes):
-            value = value.decode()
-        elif datatype is bytes and isinstance(value, text):
-            value = value.encode()
-        elif datatype is float and (isinstance(value, int)
-                                    or isinstance(value, text)
-                                    or isinstance(value, bytes)):
+    # Do type promotion/conversion and data validation for builtin
+    # types.
+    v_type = type(value)
+    if datatype in six.integer_types:
+        if v_type in _promotable_types:
+            try:
+                # Try to turn the value into an int
+                value = datatype(value)
+            except ValueError:
+                # An error is raised at the end of the function
+                # when the types don't match.
+                pass
+    elif datatype is float and v_type in _promotable_types:
+        try:
             value = float(value)
-        elif not isinstance(value, datatype):
-            raise ValueError(
-                "Wrong type. Expected '%s', got '%s'" % (
-                    datatype, type(value)
-                ))
-        return value
+        except ValueError:
+            # An error is raised at the end of the function
+            # when the types don't match.
+            pass
+    elif datatype is text and isinstance(value, bytes):
+        value = value.decode()
+    elif datatype is bytes and isinstance(value, text):
+        value = value.encode()
+
+    if not isinstance(value, datatype):
+        raise ValueError(
+            "Wrong type. Expected '%s', got '%s'" % (
+                datatype, v_type
+            ))
+    return value
 
 
 class wsproperty(property):