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365fe0b3d5
Fixes #2665. Regenerated by tabbott with `lint --fix` after a rebase and change in parameters. Note from tabbott: In a few cases, this converts technical debt in the form of unsorted imports into different technical debt in the form of our largest files having very long, ugly import sequences at the start. I expect this change will increase pressure for us to split those files, which isn't a bad thing. Signed-off-by: Anders Kaseorg <anders@zulip.com>
27 lines
874 B
Python
27 lines
874 B
Python
import binascii
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import hashlib
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import hmac
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from django.conf import settings
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def generate_camo_url(url: str) -> str:
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encoded_url = url.encode("utf-8")
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encoded_camo_key = settings.CAMO_KEY.encode("utf-8")
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digest = hmac.new(encoded_camo_key, encoded_url, hashlib.sha1).hexdigest()
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hex_encoded_url = binascii.b2a_hex(encoded_url)
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return "{}/{}".format(digest, hex_encoded_url.decode("utf-8"))
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# Encodes the provided URL using the same algorithm used by the camo
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# caching https image proxy
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def get_camo_url(url: str) -> str:
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# Only encode the url if Camo is enabled
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if settings.CAMO_URI == '':
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return url
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return f"{settings.CAMO_URI}{generate_camo_url(url)}"
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def is_camo_url_valid(digest: str, url: str) -> bool:
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camo_url = generate_camo_url(url)
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camo_url_digest = camo_url.split('/')[0]
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return camo_url_digest == digest
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