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This endpoint serves requests which might originate from an image preview link which had an http url and the message holding the image link was rendered before we introduced thumbnailing. In that case we would have used a camo proxy to proxy http content over https and avoid mix content warnings. In near future, we plan to drop use of camo and just rely on thumbor to serve such images. This endpoint helps maintain backward compatibility for links which were already rendered.
25 lines
940 B
Python
25 lines
940 B
Python
from django.conf import settings
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import codecs
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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 = codecs.encode(encoded_url, "hex") # type: ignore # https://github.com/python/typeshed/issues/300
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return "%s/%s" % (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 "%s%s" % (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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