Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 102 insertions, 0 deletions

diff --git a/doc/radosgw/swift/tempurl.rst b/doc/radosgw/swift/tempurl.rst
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+====================
+ Temp URL Operations
+====================
+
+To allow temporary access (for eg for `GET` requests) to objects
+without the need to share credentials, temp url functionality is
+supported by swift endpoint of radosgw. For this functionality,
+initially the value of `X-Account-Meta-Temp-URL-Key` and optionally
+`X-Account-Meta-Temp-URL-Key-2` should be set. The Temp URL
+functionality relies on a HMAC-SHA1 signature against these secret
+keys.
+
+.. note:: If you are planning to expose Temp URL functionality for the
+	  Swift API, it is strongly recommended to include the Swift
+	  account name in the endpoint definition, so as to most
+	  closely emulate the behavior of native OpenStack Swift. To
+	  do so, set the ``ceph.conf`` configuration option ``rgw
+	  swift account in url = true``, and update your Keystone
+	  endpoint to the URL suffix ``/v1/AUTH_%(tenant_id)s``
+	  (instead of just ``/v1``).
+
+
+POST Temp-URL Keys
+==================
+
+A ``POST`` request to the Swift account with the required key will set
+the secret temp URL key for the account, against which temporary URL
+access can be provided to accounts. Up to two keys are supported, and
+signatures are checked against both the keys, if present, so that keys
+can be rotated without invalidating the temporary URLs.
+
+.. note:: Native OpenStack Swift also supports the option to set
+          temporary URL keys at the container level, issuing a
+          ``POST`` or ``PUT`` request against a container that sets
+          ``X-Container-Meta-Temp-URL-Key`` or
+          ``X-Container-Meta-Temp-URL-Key-2``. This functionality is
+          not supported in radosgw; temporary URL keys can only be set
+          and used at the account level.
+
+Syntax
+~~~~~~
+
+::
+
+	POST /{api version}/{account} HTTP/1.1
+	Host: {fqdn}
+	X-Auth-Token: {auth-token}
+
+Request Headers
+~~~~~~~~~~~~~~~
+
+``X-Account-Meta-Temp-URL-Key``
+
+:Description: A user-defined key that takes an arbitrary string value.
+:Type: String
+:Required: Yes
+
+``X-Account-Meta-Temp-URL-Key-2``
+
+:Description: A user-defined key that takes an arbitrary string value.
+:Type: String
+:Required: No
+
+
+GET Temp-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 format of seconds since the epoch, ie Unix time
+#. The request path starting from "v1" onwards
+
+The above items are normalized with newlines appended between them,
+and a HMAC is generated using the SHA-1 hashing algorithm against one
+of the Temp URL Keys posted earlier.
+
+A sample python script to demonstrate the above is given below:
+
+
+.. code-block:: python
+
+   import hmac
+   from hashlib import sha1
+   from time import time
+
+   method = 'GET'
+   host = 'https://objectstore.example.com/swift'
+   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)
+   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/swift/v1/your-bucket/your-object?temp_url_sig=ff4657876227fc6025f04fcf1e82818266d022c6&temp_url_expires=1423200992
+