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https://issues.apache.org/jira/browse/SSHD-1094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219113#comment-17219113
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Lyor Goldstein commented on SSHD-1094:
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{quote}SFTPFileSystemAccessor or SFTPEventListener which will be best suited, I
am using both but I am confused which will be ideal to use for the above
use-case
{quote}
They both have their uses - please read their respective javadoc - I believe it
is pretty self explanatory. Read also
[https://github.com/apache/mina-sshd/blob/master/docs/sftp.md] (re-read it if
already read) - hopefully it will give you more information. In any case,
please note that the issue is talking about FTP primitives which do not
necessarily map to SFTP ones in an easy manner. E.g.
{quote}Allows you to execute your code when FTP server has received file but
haven't committed into underlying storage (filesystem).
{quote}
There is not pre-defined action of "committing" data to the underlying storage.
However, using the {{SFTPFileSystemAccessor}} and/or {{SFTPEventListener}} and
some clever programming I believe this can be achieved (unfortunately, for lack
of time I cannot tell you how exactly - not to mention the time it would take
to understand the exact feature definition...)
> Help on User Exits before any SFTP commands operation
> -----------------------------------------------------
>
> Key: SSHD-1094
> URL: https://issues.apache.org/jira/browse/SSHD-1094
> Project: MINA SSHD
> Issue Type: Question
> Reporter: Susmit Sarkar
> Priority: Critical
>
> Hello Team,
> The query is about SFTP commands exits. Before the SFTP commands get executed
> we want to hook custom java code during certain pre-defined operations.
> For example:
> *_IFtpServerUserExit_OnPutFileBeforeExecute_*
> Allows you to execute custom java code when FTP server has received command
> to put a file. This allows you to read the filename and you can use this to
> perform validation and many more. In case your code returns 'false', server
> will send a negative reply to client indicating file transfer failure. Also
> you can specify error message to be displayed at client end with 451 response
> code.
> *_IFtpServerUserExit_OnPutFileAfterExecute_*
> Allows you to execute your code when FTP server has received file but haven't
> committed into underlying storage (filesystem). This allows you to read the
> file data from an input stream. You can use this to perform things like
> dumping file to some temporary location, decline the transfer based on size,
> performing content validation and many more. In case your code returns
> 'false', server will send a negative reply to client indicating file transfer
> failure. Also you can specify error message to be displayed at client end
> with 451 response code.
> I am sharing the git link for your easy reference for my proof of concept,
> shall be grateful if you guys help me know the ideal approach to cater the
> use case
> [https://github.com/Susmit07/sftp-poc/tree/main/sftpserver/src/main/java/com]
> SFTPFileSystemAccessor or SFTPEventListener which will be best suited, I am
> using both but I am confused which will be ideal to use for the above use-case
>
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