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@@ -0,0 +1,41 @@
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+import base64
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+import hashlib
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+import hmac
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+import textwrap
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+
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+
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+key = bytes.fromhex("943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881")
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+salt = bytes.fromhex("520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5")
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+
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+
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+url = b"http://img.example.com/pretty/image.jpg"
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+
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+encoded_url = base64.urlsafe_b64encode(url).rstrip(b"=").decode()
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+# You can trim padding spaces to get good-looking url
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+encoded_url = '/'.join(textwrap.wrap(encoded_url, 16))
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+
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+path = "/{resize}/{width}/{height}/{gravity}/{enlarge}/{encoded_url}.{extension}".format(
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+ encoded_url=encoded_url,
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+ resize="fill",
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+ width=300,
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+ height=300,
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+ gravity="no",
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+ enlarge=1,
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+ extension="png",
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+).encode()
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+digest = hmac.new(key, msg=salt+path, digestmod=hashlib.sha256).digest()
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+
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+protection = base64.urlsafe_b64encode(digest).rstrip(b"=")
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+
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+url = b'/%s%s' % (
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+ protection,
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+ path,
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+)
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+
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+print(url.decode())
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+
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+# without / in url
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+# /_PQ4ytCQMMp-1w1m_vP6g8Qb-Q7yF9mwghf6PddqxLw/fill/300/300/no/1/aHR0cDovL2ltZy5leGFtcGxlLmNvbS9wcmV0dHkvaW1hZ2UuanBn.png
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+
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+# with / in url
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+# /MlF9VpgaHqcmVK3FyT9CTJhfm0rfY6JKnAtxoiAX9t0/fill/300/300/no/1/aHR0cDovL2ltZy5l/eGFtcGxlLmNvbS9w/cmV0dHkvaW1hZ2Uu/anBn.png
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oldcai