mirror of https://github.com/zulip/zulip.git
41 lines
1.6 KiB
Python
41 lines
1.6 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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if False:
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# Typing import inside `if False` to avoid import loop.
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from zerver.models import UserProfile
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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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# WARNING: If this method is changed, you may need to do a
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# corresponding update to zerver/migrations/0060_move_avatars_to_be_uid_based.py
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def user_avatar_hash(uid):
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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 = uid + settings.AVATAR_SALT
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return make_safe_digest(user_key, hashlib.sha1)
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# WARNING: If this method is changed, you will may to do a
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# corresponding update to zerver/migrations/0060_move_avatars_to_be_uid_based.py
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def user_avatar_path(user_profile):
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# type: (UserProfile) -> Text
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user_id_hash = user_avatar_hash(str(user_profile.id))
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return '%s/%s' % (str(user_profile.realm_id), user_id_hash)
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