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List:       james-dev
Subject:    [jira] [Created] (JAMES-3677) BackReference should allow pointing to specific array elements
From:       "Benoit Tellier (Jira)" <server-dev () james ! apache ! org>
Date:       2021-11-25 8:12:00
Message-ID: JIRA.13413780.1637827873000.60755.1637827920067 () Atlassian ! JIRA
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Benoit Tellier created JAMES-3677:
-------------------------------------

             Summary: BackReference should allow pointing to specific array elements
                 Key: JAMES-3677
                 URL: https://issues.apache.org/jira/browse/JAMES-3677
             Project: James Server
          Issue Type: Sub-task
          Components: JMAP
    Affects Versions: 3.6.0
            Reporter: Benoit Tellier
            Assignee: Antoine Duprat
             Fix For: 3.7.0


Today James support JMAP BackReferences to allow compose JMAP method calls together \
within a single JMAP request in order to reduce roundtrips, a la graphQL.

https://jmap.io/spec-core.html#references-to-previous-method-results specify the \
mechanism: a JSON pointer allow extracting the JSON value to supply from a previously \
executed method response. It clearly state that \
https://datatracker.ietf.org/doc/html/rfc6901 should be respected. RFC-6901 allow \
pointing toward dedicated array items:


{code:java}
Given

   {
      "foo": ["bar", "baz"],
      ...
   }

   The following JSON strings evaluate to the accompanying values:
    
    ...
    "/foo/0"       "bar"
    ...
{code}

However this is not currently supported by James. 

Confusion arrise from the fact that JMAP relies on JSON pointers for updates too and \
forbids to do partial updates. However no such limitation is stated in the context of \
back references.

Thus, in a spec compliance effort, we shall allow pointing back-references to items \
in arrays.




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