html - How to handle maliciously large input in a Rails form textarea -


i have textarea in 1 of rails forms accepts free-form input user.

client-side, can set maxlength: 500 on form prevent maliciously pasting excessively long input.

server-side, how can implement same safeguard? bypass form disabling property or post directly endpoint textarea parameter that's incredibly long. i'm assuming attack bring down server tries parse large text.

i can check length in controller (e.g. if params[:input].length < 500...) time params[] set , has had parse input.

does rails take care of type of attack? or there can/should do?

thanks!

you can add model validation, assuming storing value via active record.

validates_length_of :input, :minimum => 5, :maximum => 500, :allow_blank => true

server reject if length exceeds length. or can apply javascript before posting form checks length of textarea, let me know if need further or explanation.


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