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perl tutorial clarification

by onemadjock (Initiate)
on Nov 11, 2003 at 21:12 UTC ( #306363=perlquestion: print w/replies, xml ) Need Help??

onemadjock has asked for the wisdom of the Perl Monks concerning the following question:

Hi there - i'm new to perl and trying to do a log in for a web page but problems have arisen!

I looked at a site which had a tutorial on it: but i couldn't get it to work. Doh!

Has anyone got any suggestions how to go about doing this and anything i should look into. Thanks very much for your time


Edit by tye, add missing / to closing A tag

update (broquaint): title change (was Young apprentice needs your wisdom!)

Replies are listed 'Best First'.
Re: perl tutorial clarification
by castaway (Parson) on Nov 11, 2003 at 21:19 UTC
    Sorry, but since you don't say how it 'doesn't work', and what you actually tried, how are we supposed to help you? (PerlMonks not usually liking giving out canned code..)

    Please post the code you were trying, the errors you got, the errors from the httpd log, and what you were actually expecting to happen, and we can get on with answering the question..

    Ta, C.

      I'm not being funny but seeing as i just registered for this site, i thought you lot would take it easy with me.

      Anyway, in the tutorial I looked at, the idea was to have a file for each user and the password in that file. I simpflied it a bit and ignored the need for encryption and cookies.

      The link to the tutorial is here. The script executes without errors but doesn't recognise the user from the form on the previous page. Here's a snippet of the code:

      ... use constant USER_DATA => '../data/users/'; my $username = param( 'login' ) || ''; my $password = param( 'password' ) || ''; my $userfile = USER_DATA.$username; my $message = 'Bad password'; open USER, "< $userfile" or display_page( "Your username and password +information did not match. Check to see that you do not have Caps Lock on, hit the back button, and try again." ), exit; my $real_password = <USER>; close USER; if ( $password eq $real_password ) { $message = "Hello, $username. You gave me a good password"; } ...

      Thanks, onemadjock

        i thought you lot would take it easy with me

        castaway wasn't trying to be harsh with you; it's just that geeks like us can't read your mind, because we think differently. (I personally tend to think in Perl, when I'm thinking about programming stuff. So thinking about it the way normal people do is hard. castaway may have a similar problem.) Now that you've posted a snippet and an explanation, we are better able to figure out what you need...

        From your description, it seems you're always getting that "your username and password did not match" page, right? For testing purposes, why not add some debugging information to that page, so you can have a better idea what's going wrong?

        open USER, "<$userfile" or display_page( "Your username ($username) and password ($password) information did not match, or I was unable to verify them. (Technical error code: $!) Check to see that you do not have Caps Lock on, hit the back button, and try again." ), exit;

        Try that, and see what it tells you. This should help you isolate the problem, by telling you whether your $username and $password variables are getting set correctly and/or why you can't open the file. (Two chances out of three it's a permissions problem, but the value of $! will tell you that for sure.)

        $;=sub{$/};@;=map{my($a,$b)=($_,$;);$;=sub{$a.$b->()}} split//,".rekcah lreP rehtona tsuJ";$\=$ ;->();print$/
        What does your HTML page look like? The tutorial uses:
        my $tainted_username = param( 'username' ) || '';
        but your code reads:
        my $username = param( 'login' ) || '';
        Does the HTML form set the variable username or the variable login? Those must match.

        If things get any worse, I'll have to ask you to stop helping me.

        You will probably need to chomp $real_password; after the line read <USER>.


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