Spec of bp delete-message-with-claim-id support

Delete Message with claim id means that when a user deletes a message, the
message must be claimed. If you want to delete a message, you will have to use
both message id and claim id. This can improve the security of the message.

Change-Id: I81f505e6ac3ee8f8ab42ce0c1b80ecc878f67b78
blueprint: delete-message-with-claim-id

specs/stein/delete-message-with-claim-id.rst

@@ -0,0 +1,105 @@
+..
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+
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+
+=============================
+Delete Message With Claim ID
+=============================
+
+https://blueprints.launchpad.net/zaqar/+spec/delete-message-with-claim-id
+
+Delete Message with claim id means that when a user deletes a message, the message
+must be claimed. If you want to delete a message, you will have to use both message
+id and claim id. This can improve the security of the message.
+
+Problem description
+===================
+
+Currently, any client who knows the message ID can delete the message if it not be
+claimed. It could cause some unexpected problems. A better way to delete a message
+is make sure the message is deleted by the client who is claiming the message.
+Amazon SQS use receipt handler to delete a message[1]. Zaqar can use claim id and
+message id to delete messages.
+
+Proposed change
+===============
+
+Add a new configuration item named ``message_delete_with_claim_id``, default value
+is ``False``, means it is backwards compatible. You can modify this configuration
+item to decide whether to turn on the switch. If you change it to ``True``, you
+need to forcibly carry the claim id when delete messages. If the claim ID is invalid,
+the message can not be deleted. You must re-claim the messages, and then delete it.
+
+..note::
+
+   No matter "message_delete_with_claim_id" is True of False, admin can
+   always delete a message without claim_id.
+
+API Impact
+-----------
+Delete single message
+DELETE: /v2/queues/test_queue/messages/{message_id}?claim_id={claim_id}
+
+  RESPONSE CODE: 204
+
+Delete messages
+DELETE: /v2/queues/test_queue/messages?ids={messages_ids}&claim_ids={claim_ids}
+
+  RESPONSE CODE: 204
+
+
+Drawbacks
+---------
+
+None
+
+Alternatives
+------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  cdyangzhenyu <cdyangzhenyu@gmail.com>
+
+Secondary assignee:
+  gecong<ge.cong@zte.com.cn>
+  wanghao<sxmatch1986@gmail.com>
+
+Milestones
+----------
+
+Target Milestone for completion:
+  stein RC3
+
+Work Items
+----------
+
+#. Modify message delete code.
+#. Add release note for this feature.
+#. Update API reference.
+#. Add user/developer document for this feature.
+#. Change unit, functional and tempest tests accordingly.
+
+Dependencies
+============
+
+None
+
+References
+==========
+
+[1]:https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-queue-message-identifiers.html

specs/stein/index.rst

@@ -7,3 +7,4 @@
    :maxdepth: 2
 
    email-notification-by-internal-tool
+   delete-message-with-claim-id