mirror of https://github.com/zulip/zulip.git
25 lines
872 B
Python
25 lines
872 B
Python
from django.conf import settings
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import binascii
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import hashlib
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import hmac
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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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