[misp] Allow pydantic to parse number as str (#5054)

[throuxel]

Proposed changes

• Allow pydantic to parse number as str

Related issues

• [MISP] Pydantic errors #5054

Checklist

• I consider the submitted work as finished
• I have signed my commits using GPG key.
• I tested the code for its functionality using different use cases
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[Megafredo]

Enabling coerce_numbers_to_str in the MISPBaseModel class resolves most of the type errors listed in the issue:

✅ Cases that work correctly with coerce_numbers_to_str=True:
From ExtendedEvent(MISPBaseModel):

• Event.id → ok
• Event.org_id → ok
• Event.orgc_id → ok
• Event.attribute_count → ok
• Event.timestamp → ok
• Event.sharing_group_id → ok
• Event.publish_timestamp → ok

From EventOrganization(MISPBaseModel):

• Event.Org.id → ok
• Event.Orgc.id → ok

⚠️ Cases that do not work with coerce_numbers_to_str=True:
When the field is a StrEnum and not simply a str, coerce_numbers_to_str is not sufficient to accept an int as a value:

From ExtendedEvent(MISPBaseModel):

• Event.distribution → fails
• Event.analysis → fails
• Event.threat_level_id → fails

Typical error example:
(distribution) Input should be '0', '1', '2', '3', '4' or '5' [type=enum, input_value=1, input_type=int]
(analysis) Input should be '0', '1' or '2' [type=enum, input_value=1, input_type=int]
(threat_level_id) Input should be '1', '2', '3' or '4' [type=enum, input_value=3, input_type=int]

In addition, we already have coerce_numbers_to_str=True for these 3 fields in their definition:

distribution: Optional[DistributionLevelId] = Field(default=None, coerce_numbers_to_str=True) 
analysis: Optional[AnalysisLevelId] = Field(default=None, coerce_numbers_to_str=True) 
threat_level_id: Optional[ThreatLevelId] = Field(default=None, coerce_numbers_to_str=True)

It seems that coerce_numbers_to_str only applies to fields of the classic str type. For these three fields, it will be necessary to add a field_validator in mode="before" in order to automatically convert int values to str before validating the enum.

[Megafredo]

That's fine with me! Good job!