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Validating forms with perl

[% END %] [% IF result.invalid('param1') %] [% END %] [% IF result.invalid('param1', ' ASCII') %] [% END %] [% IF result.invalid('param1', ' LENGTH') %] [% END %] This module provides you a sweet way of form data validation with simple constraints chains.You can write constraints on single line for each input data.For example, some of the fields may only accept numbers while others may only accept dates, some fields may only accept a certain range of entries, some fields may be required, and some combinations of fields may not permitted.All of these examples must be handled by only two types of checks: the first is to validate each element user's input as the data is entered; the second is to perform the validation when the form is submitted.This can make filling out the form tedious, and people might stop in the middle.If you use the following script and Perl source you will know how to validate an entire form at once, displaying a series of error messages that your reader can then go back and fix.

The second objective is to confront the question "How can software be designed and implemented to withstand malicious input attacks?Once you have an HTML form up and running, you will often want to make sure that all the important fields are filled in.For example, if you are going to send an email confirmation letter, the email address should be included in the form fields, and it should be an email address that works.Among these entities there necessarily exists a complicated network of explicit and implicit trust relationships, which in all but the simplest situations is too difficult (often impossible) to analyze.The problem, of course, dwells in the fact that links in this trust relationship network are vulnerable to abuse if their role and importance has been underestimated in the development process.A thorough examination of trust management issues in software security could easily constitute a multivolume work by itself, and there is a lot of related research underway.For a good general introduction to the subject, consult [1] and Chapter 13 of [2].There are two ways to validate your forms: The basic premise of creating form validation is to look for the names of form elements that are required, and if they are empty, display an error message.Most error checking programs check each field one at a time, and display one error at a time.A very important, well known, yet too often lightly dismissed problem in software security is that of trust management.There are many parties involved in the building and deployment of a software product (even if there's only one developer), and the entities that interact with the resulting system are even more, and often with diverse interests.

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