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import base64
import hmac, hashlib
POLICY = """{"expiration": "2012-01-01T00:00:00Z",
"conditions": [
{"bucket": "AWS_BUCKET_NAME"},
["starts-with", "$key", "uploads/"],
{"acl": "private"},
{"success_action_redirect": "/"},
["starts-with", "$Content-Type", ""],
["content-length-range", 0, 1048576]
]
}"""
KEY = "AWS_SECRET_KEY"
policy = base64.b64encode(POLICY)
sig = base64.b64encode(hmac.new(KEY, policy, hashlib.sha1).digest())
print sig
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