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280 lines
6.8 KiB
ReStructuredText
280 lines
6.8 KiB
ReStructuredText
======================
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Container Operations
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======================
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A container is a mechanism for storing data objects. An account may
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have many containers, but container names must be unique. This API enables a
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client to create a container, set access controls and metadata,
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retrieve a container's contents, and delete a container. Since this API
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makes requests related to information in a particular user's account, all
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requests in this API must be authenticated unless a container's access control
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is deliberately made publicly accessible (i.e., allows anonymous requests).
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.. note:: The Amazon S3 API uses the term 'bucket' to describe a data container.
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When you hear someone refer to a 'bucket' within the Swift API, the term
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'bucket' may be construed as the equivalent of the term 'container.'
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One facet of object storage is that it does not support hierachical paths
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or directories. Instead, it supports one level consisting of one or more
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containers, where each container may have objects. The RADOS Gateway's
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Swift-compatible API supports the notion of 'psuedo-hierarchical containers,'
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which is a means of using object naming to emulate a container (or directory)
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hierachy without actually implementing one in the storage system. You may
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name objects with pseudo-hiearchical names
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(e.g., photos/buildings/empire-state.jpg), but container names cannot
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contain a forward slash (``/``) character.
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Create a Container
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==================
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To create a new container, make a ``PUT`` request with the API version, account,
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and the name of the new container. The container name must be unique, must not
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contain a forward-slash (/) character, and should be less than 256 bytes. You
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may include access control headers and metadata headers in the request. The
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operation is idempotent; that is, if you make a request to create a container
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that already exists, it will return with a HTTP 202 return code, but will not
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create another container.
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Syntax
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~~~~~~
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::
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PUT /{api version}/{account}/{container} HTTP/1.1
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Host: {fqdn}
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X-Auth-Token: {auth-token}
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X-Container-Read: {comma-separated-uids}
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X-Container-Write: {comma-separated-uids}
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X-Container-Meta-{key}: {value}
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Headers
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~~~~~~~
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``X-Container-Read``
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:Description: The user IDs with read permissions for the container.
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:Type: Comma-separated string values of user IDs.
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:Required: No
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``X-Container-Write``
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:Description: The user IDs with write permissions for the container.
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:Type: Comma-separated string values of user IDs.
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:Required: No
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``X-Container-Meta-{key}``
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:Description: A user-defined meta data key that takes an arbitrary string value.
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:Type: String
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:Required: No
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HTTP Response
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~~~~~~~~~~~~~
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If a container with the same name already exists, and the user is the
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container owner then the operation will succeed. Otherwise the operation
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will fail.
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``409``
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:Description: The container already exists under a different user's ownership.
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:Status Code: ``BucketAlreadyExists``
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List a Container's Objects
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==========================
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To list the objects within a container, make a ``GET`` request with the with the
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API version, account, and the name of the container. You can specify query
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parameters to filter the full list, or leave out the parameters to return a list
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of the first 10,000 object names stored in the container.
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Syntax
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~~~~~~
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::
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GET /{api version}/{container} HTTP/1.1
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Host: {fqdn}
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X-Auth-Token: {auth-token}
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Parameters
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~~~~~~~~~~
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``format``
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:Description: Defines the format of the result.
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:Type: String
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:Valid Values: ``json`` | ``xml``
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:Required: No
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``prefix``
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:Description: Limits the result set to objects beginning with the specified prefix.
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:Type: String
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:Required: No
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``marker``
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:Description: Returns a list of results greater than the marker value.
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:Type: String
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:Required: No
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``limit``
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:Description: Limits the number of results to the specified value.
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:Type: Integer
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:Valid Range: 0 - 10,000
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:Required: No
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``delimiter``
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:Description: The delimiter between the prefix and the rest of the object name.
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:Type: String
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:Required: No
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``path``
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:Description: The pseudo-hierarchical path of the objects.
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:Type: String
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:Required: No
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Response Entities
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~~~~~~~~~~~~~~~~~
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``container``
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:Description: The container.
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:Type: Container
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``object``
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:Description: An object within the container.
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:Type: Container
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``name``
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:Description: The name of an object within the container.
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:Type: String
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``hash``
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:Description: A hash code of the object's contents.
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:Type: String
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``last_modified``
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:Description: The last time the object's contents were modified.
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:Type: Date
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``content_type``
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:Description: The type of content within the object.
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:Type: String
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Update a Container's ACLs
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=========================
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When a user creates a container, the user has read and write access to the
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container by default. To allow other users to read a container's contents or
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write to a container, you must specifically enable the user.
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You may also specify ``*`` in the ``X-Container-Read`` or ``X-Container-Write``
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settings, which effectively enables all users to either read from or write
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to the container. Setting ``*`` makes the container public. That is it
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enables anonymous users to either read from or write to the container.
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Syntax
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~~~~~~
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::
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POST /{api version}/{account}/{container} HTTP/1.1
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Host: {fqdn}
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X-Auth-Token: {auth-token}
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X-Container-Read: *
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X-Container-Write: {uid1}, {uid2}, {uid3}
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Request Headers
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~~~~~~~~~~~~~~~
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``X-Container-Read``
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:Description: The user IDs with read permissions for the container.
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:Type: Comma-separated string values of user IDs.
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:Required: No
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``X-Container-Write``
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:Description: The user IDs with write permissions for the container.
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:Type: Comma-separated string values of user IDs.
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:Required: No
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Add/Update Container Metadata
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=============================
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To add metadata to a container, make a ``POST`` request with the API version,
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account, and container name. You must have write permissions on the
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container to add or update metadata.
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Syntax
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~~~~~~
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::
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POST /{api version}/{account}/{container} HTTP/1.1
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Host: {fqdn}
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X-Auth-Token: {auth-token}
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X-Container-Meta-Color: red
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X-Container-Meta-Taste: salty
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Request Headers
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~~~~~~~~~~~~~~~
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``X-Container-Meta-{key}``
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:Description: A user-defined meta data key that takes an arbitrary string value.
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:Type: String
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:Required: No
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Delete a Container
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==================
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To delete a container, make a ``DELETE`` request with the API version, account,
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and the name of the container. The container must be empty. If you'd like to check
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if the container is empty, execute a ``HEAD`` request against the container. Once
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you've successfully removed the container, you'll be able to reuse the container name.
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Syntax
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~~~~~~
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::
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DELETE /{api version}/{account}/{container} HTTP/1.1
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Host: {fqdn}
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X-Auth-Token: {auth-token}
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HTTP Response
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~~~~~~~~~~~~~
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``204``
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:Description: The container was removed.
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:Status Code: ``NoContent``
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