policy.json

{	"expiration" : {"day":1},
	"conditions": [ ["starts-with", "$key", "radek.student"],
    				 {"bucket": "lab4-weeia"}, 
    				 {"acl": "private"},
    				 {"success_action_redirect": "http:\\localhost:8080"},   
    				 ["content-length-range", 0, 1048576]
    				]   
}