View of /trunk/webwork-modperl/lib/Apache/WeBWorK.pm

    1 # Apache::WeBWorK - The WeBWorK dispatcher module
    2 # Place something like the following in your Apache configuration to load the
    3 # WeBWorK module and install it as a handler for the WeBWorK system
    4 
    5 # PerlModule Apache::WeBWorK
    6 # PerlRequire /path/to/webwork/conf/init.pl
    7 # PerlSetVar webwork_root /path/to/webwork
    8 # <Location /webwork>
    9 # SetHandler perl-script
   10 # PerlHandler Apache::WeBWorK
   11 # </Location>
   12 
   13 package Apache::WeBWorK;
   14 
   15 use strict;
   16 use Apache::Constants qw(:common REDIRECT);
   17 use Apache::Request;
   18 use WeBWorK::CourseEnvironment;
   19 use WeBWorK::Test;
   20 use WeBWorK::Authen;
   21 use WeBWorK::Login;
   22 use WeBWorK::ProblemSets;
   23 use WeBWorK::ProblemSet;
   24 use WeBWorK::Problem;
   25 
   26 # registering discontent: wanted to call this dispatch, but mod_perl gave me lip
   27 sub handler() {
   28   my $r = Apache::Request->new(shift); # have to deal with unpredictable GET or POST data ,and sift through it for the key.  So use Apache::Request
   29 
   30   # This stuff is pretty much copied out of the O'Reilly mod_perl book.
   31   # It's for figuring out the basepath.  I may change this up if I
   32   # find a better way to do it.
   33   my $path_info = $r->path_info;
   34   my $path_translated = $r->lookup_uri($path_info)->filename;
   35   my $current_uri = $r->uri;
   36   unless ($path_info) {
   37     $r->header_out(Location => "$current_uri/");
   38     return REDIRECT;
   39   }
   40 
   41   return OK if $r->header_only;
   42 
   43   my($junk, @components) = split "/", $path_info;
   44   my $webwork_root = $r->dir_config('webwork_root'); # From a PerlSetVar in httpd.conf
   45   my $course = shift @components;
   46 
   47   # Try to get the course environment.
   48   my $course_env = eval {WeBWorK::CourseEnvironment->new($webwork_root, $course);};
   49   if ($@) { # If no course exists matching the requested course
   50     # TODO: display an error page.  For now, 404 it.
   51     return DECLINED;
   52   }
   53 
   54   # WeBWorK::Authen::verify erases the passwd field and sets the key field
   55   # if login is successful.
   56   if (!WeBWorK::Authen->new($r, $course_env)->verify) {
   57     return WeBWorK::Login->new($r, $course_env)->go;
   58   } else {
   59     my $arg = shift @components;
   60     if (!defined $arg) { # We want the list of problem sets
   61       return WeBWorK::ProblemSets->new($r, $course_env)->go;
   62     } elsif ($arg eq "prof") {
   63       ###
   64     } elsif ($arg eq "prefs") {
   65       ###
   66     } else { # We've got the name of a problem set.
   67       my $problem_set = $arg;
   68       my $ps_arg = shift @components;
   69 
   70       if (!defined $ps_arg) {
   71         # list the problems in the problem set
   72         return WeBWorK::ProblemSet->new($r, $course_env)->go($problem_set);
   73       } elsif ($ps_arg eq "hardcopy") {
   74         ###
   75       }
   76       else {
   77         # We've got the name of a problem
   78         my $problem = $ps_arg;
   79         return WeBWorK::Problem->new($r, $course_env)->go($problem_set, $problem);
   80       }
   81     }
   82 
   83     if (1) {
   84       return WeBWorK::Test->new($r, $course_env)->go;
   85     }
   86   }
   87 
   88   # If the dispatcher doesn't know any modules that want to handle
   89   # the current path, it'll claim that the path does not exist by
   90   # declining the request.
   91   return DECLINED;
   92 }
   93 
   94 1;