Add max/min safe integer

JSON cannot safely handle integers outside range ``-(2**53) - 1`` to
``(2**53) - 1``. Add constants for safe integers and limit the Int
parameter to safe JSON values.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_SAFE_INTEGER

See: https://pagure.io/freeipa/issue/8802
See: https://pagure.io/freeipa/issue/8361
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>

ipalib/parameters.py

@@ -130,6 +130,13 @@ from ipapython.dn import DN
 from ipapython.dnsutil import DNSName
 
 
+MAX_UINT32 = (1 << 32) - 1
+# JavaScript Number.MAX_SAFE_INTEGER / Number.MIN_SAFE_INTEGER
+# JSON cannot safely encode values outside this range as regular number
+MAX_SAFE_INTEGER = (2**53) - 1
+MIN_SAFE_INTEGER = -MAX_SAFE_INTEGER
+
+
 def _is_null(value):
     if value:
         return False
@@ -1093,6 +1100,12 @@ class Int(Number):
     allowed_types = (int,)
     type_error = _('must be an integer')
 
+    MININT = MININT
+    MAXINT = MAXINT
+    MAX_UINT32 = MAX_UINT32
+    MAX_SAFE_INTEGER = MAX_SAFE_INTEGER
+    MIN_SAFE_INTEGER = MIN_SAFE_INTEGER
+
     kwargs = Param.kwargs + (
         ('minvalue', int, int(MININT)),
         ('maxvalue', int, int(MAXINT)),
@@ -1124,6 +1137,16 @@ class Int(Number):
                 '%s: minvalue > maxvalue (minvalue=%r, maxvalue=%r)' % (
                     self.nice, self.minvalue, self.maxvalue)
             )
+        if self.minvalue < self.MIN_SAFE_INTEGER:
+            raise ValueError(
+                f"minvalue {self.minvalue} outside range of safe JSON "
+                f"integer limit {self.MIN_SAFE_INTEGER}"
+            )
+        if self.maxvalue > self.MAX_SAFE_INTEGER:
+            raise ValueError(
+                f"maxvalue {self.maxvalue} outside range of safe JSON "
+                f"integer limit {self.MAX_SAFE_INTEGER}"
+            )
 
     def _convert_scalar(self, value, index=None):
         """

ipatests/test_ipalib/test_parameters.py

@@ -1318,6 +1318,23 @@ class test_Int(ClassChecker):
         param = self.cls('my_number')
         check_int_scalar_conversions(param)
 
+    def test_safe_json(self):
+        param = self.cls(
+            "large",
+            minvalue=self.cls.MIN_SAFE_INTEGER,
+            maxvalue=self.cls.MAX_SAFE_INTEGER
+        )
+        for value in (-((2 ** 53) - 1), 0, (2 ** 53) - 1):
+            param.validate(value)
+        for value in (-2 ** 53, 2 ** 53):
+            with pytest.raises(errors.ValidationError):
+                param.validate(value)
+
+        with pytest.raises(ValueError):
+            self.cls("toolarge", maxvalue=2**53)
+        with pytest.raises(ValueError):
+            self.cls("toosmall", minvalue=-2**53)
+
 
 class test_Decimal(ClassChecker):
     """