Update validation

* Allow strict validation
* Add workaround to avoid all JSON dumps from MISP <=2.4.70 to fail

pymisp/data/schema-lax.json

@@ -1,7 +1,7 @@
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "title": "Validator for misp events",
-  "id": "https://www.github.com/MISP/MISP/format/2.4/schema.json",
+  "id": "https://github.com/MISP/MISP/blob/2.4/format/2.4/schema-lax.json",
   "defs": {
     "org": {
       "type": "object",
@@ -32,7 +32,7 @@
       }
     },
     "sharing_group": {
-      "type": "object",
+      "type": ["object", "array"],
       "properties": {
         "id": {
           "type": "string"

pymisp/data/schema.json

@@ -1,7 +1,7 @@
 {
   "$schema": "http://json-schema.org/draft-04/schema#",
   "title": "Validator for misp events",
-  "id": "https://www.github.com/MISP/MISP/format/2.4/schema.json",
+  "id": "https://github.com/MISP/MISP/blob/2.4/format/2.4/schema.json",
   "defs": {
     "org": {
       "type": "object",

pymisp/mispevent.py

@@ -277,14 +277,17 @@ def _int_to_str(d):
 
 class MISPEvent(object):
 
-    def __init__(self, describe_types=None):
+    def __init__(self, describe_types=None, strict_validation=False):
         self.ressources_path = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'data')
+        if strict_validation:
             with open(os.path.join(self.ressources_path, 'schema.json'), 'r') as f:
                 self.json_schema = json.load(f)
+        else:
             with open(os.path.join(self.ressources_path, 'schema-lax.json'), 'r') as f:
-            self.json_schema_lax = json.load(f)
+                self.json_schema = json.load(f)
         if not describe_types:
-            t = json.load(open(os.path.join(self.ressources_path, 'describeTypes.json'), 'r'))
+            with open(os.path.join(self.ressources_path, 'describeTypes.json'), 'r') as f:
+                t = json.load(f)
             describe_types = t['result']
         self.describe_types = describe_types
         self.categories = describe_types['categories']
@@ -406,7 +409,7 @@ class MISPEvent(object):
         # Invalid event created by MISP up to 2.4.52 (attribute_count is none instead of '0')
         if event.get('Event') and event.get('Event').get('attribute_count') is None:
             event['Event']['attribute_count'] = '0'
-        jsonschema.validate(event, self.json_schema_lax)
+        jsonschema.validate(event, self.json_schema)
         e = event.get('Event')
         self._reinitialize_event()
         self.set_all_values(**e)