Edx-django-utils

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Added
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* Added Content-Security-Policy response header middleware under ``security/csp``

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Fixed
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* Report both specified and existing email when refusing to create a user

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Added
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* Added a wrapper for background_task in monitoring.

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Added
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* Utilities for safely determining the IP address of a request: ``edx_django_utils.ip`` (moved from edx-platform)

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Changed
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* License has been changed from AGPL v3 to Apache v2 to reflect existing policies

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Changed
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* Corrupt cookie logging:

* Make independent of other cookie logging; no longer needs to meet cookie size threshold or sampling rate.
* **Breaking change**, although low impact: Setting name changed from ``UNUSUAL_COOKIE_SAMPLING_PUBLIC_KEY`` to ``UNUSUAL_COOKIE_HEADER_PUBLIC_KEY``.
* New setting ``UNUSUAL_COOKIE_HEADER_LOG_CHUNK`` helps avoid truncated (non-decryptable) messages by splitting the output across multiple log messages.