generate-policy-signature.py

#!/usr/bin/env python

p = """{"expiration": "2013-01-01T00:00:00Z",
  "conditions": [
    {"bucket": "sam-s3-test-64"},
    ["starts-with", "$key", "upload-"],
    {"acl": "private"},
    ["starts-with", "$Content-Type", ""],
    ["starts-with", "$redirect", ""],
    ["starts-with", "$x-archive-auto-make-bucket", ""],
    ["starts-with", "$x-archive-queue-derive", ""],
    ["content-length-range", 0, 1048576]
  ]
}"""

# secret key
s = "seCr3tk3y"

import base64
import hmac, sha

policy = base64.b64encode(p)

signature = base64.b64encode(
    hmac.new(s, policy, sha).digest())


print policy
print signature