Opentaxii

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* Add tests for python 3.6, 3.7, 3.8, 3.9, pypy
* Add tests for sqlite, mysql, mariadb, postgresql
* Fix bug that broke ``delete_content_blocks`` when using mysql on sqlalchemy 1.3
* Docs: Add db schema diagram
* Docs: Clarify how to get default data in a default (development) docker instance
* Fix implicit routing in TAXII 1.1 Inboxes
* Update jwt usage to pyjwt >= 2.0 (thanks `SanyaKapoor <https://github.com/SanyaKapoor>`_)

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* Enforce UTC usage in datetime fields in SQL DB Persistence API.
* `Fix for 114 <https://github.com/eclecticiq/OpenTAXII/issues/114>`_: reintroduce ``opentaxii-create-account`` CLI command.
* `Fix for 153 <https://github.com/eclecticiq/OpenTAXII/issues/152>`_: check if user can modify a collection before advertising it over inbox service.
* Multiple coding style fixes.
* Various documentation updates.

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* Remove unnecessary print statements.

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* Make JSON logging consistent when the application is run via Gunicorn.
* Set ``acceptable_destination`` key in status details instead of extended headers
* Allow passing ``engine_parameters`` to ``SQLDatabaseAPI`` for those who want to customize SQLAlchemy engine parameters.
* Require recent version of ``lxml`` for security reasons.
* Various test and Docker infrastructure improvements.

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* Replace separate service/collection/account creation process with single ``opentaxii-sync-data`` CLI command.
* Persistence and Auth APIs extended with missing CRUD methods, that are used by ``opentaxii-sync-data``.
* Read/modify collection level ACL added.
* DB models for default implementation of Persistence API and Auth API were changed. No automatic migration code is provided (sorry!), so upgrading might require manual DB migration.
* Drop python2.7 from testing scope.
* Various bug fixes and improvements.

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* `libtaxii <https://github.com/TAXIIProject/libtaxii>`_ dependency upgraded to 1.1.111.
* Various bug fixes and improvements (thanks to `bjigmp <https://github.com/bjigmp>`_, `chorsley <https://github.com/chorsley>`_, `rjprins <https://github.com/rjprins>`_).