Added suport for format attribute in jsonschema

Author: VMRuiz

requirements.txt

@@ -1,3 +1,3 @@
-jsonschema
+jsonschema[format]
 scrapy
 six

scrapy_jsonschema/item.py

@@ -6,8 +6,8 @@
     Draft4Validator,
     Draft6Validator,
     Draft7Validator,
+    FormatChecker
 )
-
 from scrapy_jsonschema.draft import (
     JSON_SCHEMA_DRAFT_3,
     JSON_SCHEMA_DRAFT_4,
@@ -34,6 +34,8 @@ def _merge_schema(base, new):
 
 class JsonSchemaMeta(ABCMeta):
 
+    format_checker = FormatChecker()
+
     draft_to_validator = {
         JSON_SCHEMA_DRAFT_3: Draft3Validator,
         JSON_SCHEMA_DRAFT_4: Draft4Validator,
@@ -71,7 +73,7 @@ def _get_validator(cls, schema):
         validator_class = cls.draft_to_validator.get(
             draft_version, Draft4Validator
         )
-        return validator_class(schema)
+        return validator_class(schema, format_checker=cls.format_checker)
 
 
 @six.add_metaclass(JsonSchemaMeta)

tests/test_item.py

@@ -6,6 +6,7 @@
 
 from scrapy_jsonschema.item import JsonSchemaItem, _merge_schema
 from scrapy_jsonschema.draft import JSON_SCHEMA_DRAFT_7
+from jsonschema.exceptions import ValidationError
 
 from . import (
     valid_schema,
@@ -85,3 +86,21 @@ def test_get_validator(self):
         no_draft_chema = {"title": "Item without schema Draft"}
         default_validator = JsonSchemaItem._get_validator(no_draft_chema)
         self.assertTrue(isinstance(default_validator, Draft4Validator))
+
+    def test_format_validation(self):
+        schema = {
+            "$schema": JSON_SCHEMA_DRAFT_7,
+            "title": "Item with Schema Draft",
+            "properties": {
+                "url": {
+                    "type": "string",
+                    "format": "uri"
+                }
+            }
+        }
+
+        with pytest.raises(ValidationError):
+            draft7_validator = JsonSchemaItem._get_validator(schema)
+            draft7_validator.validate({'url': 'this is not an uri'})
+
+        draft7_validator.validate({'url': 'http://localhost'})