[GitHub] incubator-ponymail issue #176: Bug: "full' id generator is not stable

[sebbASF <gi...@git.apache.org>]

GitHub user sebbASF opened an issue:

    https://github.com/apache/incubator-ponymail/issues/176

    Bug: "full' id generator is not stable

    The "full" id generator currently take the hash of the input message as parsed by MM3 or by a Python email package. The parsed message may be massaged e.g. by adding an 'archived-at' header before it is converted into bytes.
    
    Whilst this guarantees uniqueness, it is not repeatable.
    
    If the same message is reloaded from a different source - or even the same source, if the 'archived-at' header is not present - it will get a different id, and thus may be stored as well as the original identical message.
    
    If the database has to be regenerated from source, the message ids will be different. Since the message ids are used to create Permalinks, any existing Permalinks will stop working.
    
    The generator also uses the same output format as the "medium" generator, which may cause problems in future.

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