[client] create get_reader method from entity_type (#605)

Author: marieflorescontact

pycti/utils/opencti_stix2.py

@@ -835,6 +835,21 @@ def get_readers(self):
             "Vulnerability": self.opencti.vulnerability.read,
         }
 
+    def get_reader(self, entity_type: str):
+        # Map types
+        if entity_type == "StixFile":
+            entity_type = "File"
+        if IdentityTypes.has_value(entity_type):
+            entity_type = "Identity"
+        if LocationTypes.has_value(entity_type):
+            entity_type = "Location"
+        if StixCyberObservableTypes.has_value(entity_type):
+            entity_type = "Stix-Cyber-Observable"
+        readers = self.get_readers()
+        return readers.get(
+            entity_type, lambda **kwargs: self.unknown_type({"type": entity_type})
+        )
+
     # endregion
 
     # region import