Swift get temporary URL objects

Temporary URL uses a cryptographic HMAC-SHA1 signature, which includes the following elements:

  • The value of the Request method, GET for instance.

  • The expiry time, in the format of seconds since the epoch, that is, Unix time.

  • The request path that starts from v1 onwards.

The items are normalized with newlines that are appended between them. An HMAC is generated that uses the SHA-1 hashing algorithm against one of the Temp URL Keys posted earlier.

The following example is a sample python script to demonstrate this.

Example 

import hmac
from hashlib import sha1
from time import time

method = 'GET'
host = 'https://objectstore.example.com'
duration_in_seconds = 300  # Duration for which the url is valid
expires = int(time() + duration_in_seconds)
path = '/v1/your-bucket/your-object'
key = 'secret'
hmac_body = '%s\n%s\n%s' % (method, expires, path)
hmac_body = hmac.new(key, hmac_body, sha1).hexdigest()
sig = hmac.new(key, hmac_body, sha1).hexdigest()
rest_uri = "{host}{path}?temp_url_sig={sig}&temp_url_expires={expires}".format(
     host=host, path=path, sig=sig, expires=expires)
print rest_uri

Example Output 

https://objectstore.example.com/v1/your-bucket/your-object?temp_url_sig=ff4657876227fc6025f04fcf1e82818266d022c6&temp_url_expires=1423200992