[Doppel] Converting Doppel Alerts to STIX 2.1 Observables

[siddharths1-metron]

Proposed changes

• This new version of Doppel OpenCTI connector converts doppel alerts to STIX 2.1 Observables.
• Converts the Observables into Indicators if the alert is actioned/taken_down.
• Revokes the Indicator if alert is mark as unresolved from actioned/taken_down state.

Related issues

• 4385

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

[Ninoxe]

Hi @siddharths1-metron

Thank you for your PR.

There are a lot of files that have nothing to do with Doppel. Can you modify it so that only Doppel files are included in the PR?

[siddharths1-metron]

Hi @siddharths1-metron

Thank you for your PR.

There are a lot of files that have nothing to do with Doppel. Can you modify it so that only Doppel files are included in the PR?

Hello @Ninoxe I have modified the PR, please take a look thanks!
Also I did run isort --profile black . inside external-import/doppel do you have any idea why the check is still failing?

[siddharths1-metron]

Hello @Ninoxe, any update on this? Thanks.

[Ninoxe]

Hi @siddharths1-metron
Thank you for your PR.
There are a lot of files that have nothing to do with Doppel. Can you modify it so that only Doppel files are included in the PR?

Hello @Ninoxe I have modified the PR, please take a look thanks! Also I did run isort --profile black . inside external-import/doppel do you have any idea why the check is still failing?

Hi @siddharths1-metron !

Did you try to run the command just inside external-import and not inside the connector like isort --profile black doppel?

[siddharths1-metron]

Hello @Ninoxe any update on this? I did run the cmd as suggested. Thanks!