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28 lines
1.0 KiB
Python
28 lines
1.0 KiB
Python
from __future__ import absolute_import
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from django.conf import settings
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from typing import Text
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from zerver.lib.utils import make_safe_digest
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import hashlib
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def gravatar_hash(email):
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# type: (Text) -> Text
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"""Compute the Gravatar hash for an email address."""
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# Non-ASCII characters aren't permitted by the currently active e-mail
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# RFCs. However, the IETF has published https://tools.ietf.org/html/rfc4952,
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# outlining internationalization of email addresses, and regardless if we
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# typo an address or someone manages to give us a non-ASCII address, let's
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# not error out on it.
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return make_safe_digest(email.lower(), hashlib.md5)
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def user_avatar_hash(email):
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# type: (Text) -> Text
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# Salting the user_key may be overkill, but it prevents us from
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# basically mimicking Gravatar's hashing scheme, which could lead
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# to some abuse scenarios like folks using us as a free Gravatar
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# replacement.
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user_key = email.lower() + settings.AVATAR_SALT
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return make_safe_digest(user_key, hashlib.sha1)
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