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https://issues.apache.org/jira/browse/SSHD-1094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219288#comment-17219288
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Susmit Sarkar commented on SSHD-1094:
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Thanks Lyor, we have the solution
> 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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