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How to prevent server adding/editing/deleting

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I would like to figure out how to validate the server credentials for my provisioning module during adding/editing a server and prevent the operation and show an error if something is wrong.

Please advise how to do it. 

Can I  use hooks ServerAdd, ServerEdit, ServerDelete for it? if yes, what should I return in the hook callback?

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Those would be the correct hooks, but they don't support any returns and thus wont help here.   What you could do is use those hooks and redirect back to the server page when your tests fail and set a session variable of "server_error".  Then use an AdminAreaHeaderOutput hook and check for that session variable and display error. 

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