JsonStringSchema: add min_datetime & max_datetime

First step in addressing Issue #334.

Author: pont-us

test/util/test_jsonschema.py

@@ -112,10 +112,23 @@ def test_to_instance(self):
                                                    max_length=10).to_instance('pieps'))
         self.assertEqual('pieps', JsonStringSchema(pattern='.*').to_instance('pieps'))
         self.assertEqual('2020-01-03', JsonStringSchema(format='date').to_instance('2020-01-03'))
+        self.assertEqual('2020-06-03',
+                         JsonStringSchema(format='datetime',
+                                          min_datetime='2020-02-01',
+                                          max_datetime='2020-07-05').
+                         to_instance('2020-06-03'))
 
     def test_from_instance(self):
         self.assertEqual('pieps', JsonStringSchema().from_instance('pieps'))
 
+    def test_store_date_limits(self):
+        minimum = '1981-05-06'
+        maximum = '1982-09-15'
+        schema = JsonStringSchema(format='datetime', min_datetime=minimum,
+                                  max_datetime=maximum)
+        self.assertEqual(minimum, schema.min_datetime)
+        self.assertEqual(maximum, schema.max_datetime)
+
 
 class JsonArraySchemaTest(unittest.TestCase):
 

xcube/util/jsonschema.py

@@ -138,12 +138,16 @@ def __init__(self,
                  pattern: str = None,
                  min_length: int = None,
                  max_length: int = None,
+                 min_datetime: str = None,
+                 max_datetime: str = None,
                  **kwargs):
         super().__init__(type='string', **kwargs)
         self.format = format
         self.pattern = pattern
         self.min_length = min_length
         self.max_length = max_length
+        self.min_datetime = min_datetime
+        self.max_datetime = max_datetime
 
     def to_dict(self) -> Dict[str, Any]:
         d = super().to_dict()
@@ -155,6 +159,10 @@ def to_dict(self) -> Dict[str, Any]:
             d.update(minLength=self.min_length)
         if self.max_length is not None:
             d.update(maxLength=self.max_length)
+        if self.min_datetime is not None:
+            d.update(minDatetime=self.min_datetime)
+        if self.max_datetime is not None:
+            d.update(maxDatetime=self.max_datetime)
         return d