{
  "expiration": "2100-01-01T12:00:00.000Z",
  "conditions": [
    {"acl": "public-read" },
    {"bucket": "sendgrid-open-source" },
    ["starts-with", "$key", "sendgrid-php/"],
    ["content-length-range", 2048, 268435456],
    ["eq", "$Content-Type", "application/zip"]
  ]
}