Exception when importing STIX 2 Indicators due to invalid default type in valid_from

[JasonKeirstead]

Please replace every line in curly brackets { like this } with an appropriate answer, and remove this line.

Description

If you try to import a STIX 2 Indicator object with no valid_from, the code sets it to a millisecond long value when the database expects it to be a Date type, which throws an error.

Environment

OpenCTI current source code

Reproducible Steps

Steps to create the smallest reproducible scenario:

Step 1: Create a STIX 2 Indicator, without valid_from set
Step 2: Ensure it is valid STIX
Step 3: Attempt import to OpenCTI

Expected Output

Expect it to import

Actual Output

grakn.core.kb.concept.api.GraknConceptException: The value [1579035233199] of type [Long] must be of datatype [java.time.LocalDateTime] at grakn.core.kb.concept.api.GraknConceptException.create(GraknConceptException.java:55) at grakn.core.kb.concept.api.GraknConceptException.invalidAttributeValue(GraknConceptException.java:116) at grakn.core.concept.manager.ConceptManagerImpl.createAttribute(ConceptManagerImpl.java:271) at grakn.core.concept.manager.ConceptManagerImpl.createAttribute(ConceptManagerImpl.java:92) at grakn.core.concept.impl.AttributeTypeImpl.putAttribute(AttributeTypeImpl.java:120)

Additional information

Problematic generated insert statement

insert $entity isa Indicator, has internal_id_key "indicator--590884dd-3573-470d-b12c-91097f412be3", has stix_id_key "indicator--590884dd-3573-470d-b12c-91097f412be3", has name "Indicator", has description "", has indicator_pattern "[ipv4-addr:value = '172.31.88.63']", has pattern_type "stix2", has main_observable_type "ipv4-addr", has valid_from 1579098216711, has valid_from_day "2020-01-15", has valid_from_month "2020-01", has valid_from_year "2020", has valid_until 2021-01-14T14:23:36, has valid_until_day "2021-01-14", has valid_until_month "2021-01", has valid_until_year "2021", has score 50, has created 2019-11-27T15:26:08, has modified 2019-11-27T15:26:08, has entity_type "indicator", has created_at 2020-01-15T14:23:36, has created_at_day "2020-01-15", has created_at_month "2020-01", has created_at_year "2020", has updated_at 2020-01-15T14:23:36, has alias "", has revoked false, has valid_from_day "2020-01-15", has valid_from_month "2020-01", has valid_from_year "2020", has valid_until_day "2021-01-14", has valid_until_month "2021-01", has valid_until_year "2021", has created_at_day "2020-01-15", has created_at_month "2020-01", has created_at_year "2020";