View of /trunk/webwork2/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   my $args = $r->args;
   37 
   38   # If it's a valid WeBWorK URI, it ends in a /.  This is assumed
   39   # alllll over the place.
   40   unless (substr($current_uri,-1) eq '/') {
   41     $r->header_out(Location => "$current_uri/?$args");
   42     return REDIRECT;
   43   }
   44 
   45   return OK if $r->header_only;
   46 
   47   my($junk, @components) = split "/", $path_info;
   48   my $webwork_root = $r->dir_config('webwork_root'); # From a PerlSetVar in httpd.conf
   49   my $course = shift @components;
   50 
   51   # Try to get the course environment.
   52   my $course_env = eval {WeBWorK::CourseEnvironment->new($webwork_root, $course);};
   53   if ($@) { # If no course exists matching the requested course
   54     # TODO: display an error page.  For now, 404 it.
   55     return DECLINED;
   56   }
   57 
   58   # WeBWorK::Authen::verify erases the passwd field and sets the key field
   59   # if login is successful.
   60   if (!WeBWorK::Authen->new($r, $course_env)->verify) {
   61     return WeBWorK::Login->new($r, $course_env)->go;
   62   } else {
   63     my $arg = shift @components;
   64     if (!defined $arg) { # We want the list of problem sets
   65       return WeBWorK::ProblemSets->new($r, $course_env)->go;
   66     } elsif ($arg eq "prof") {
   67       ###
   68     } elsif ($arg eq "prefs") {
   69       ###
   70     } else { # We've got the name of a problem set.
   71       my $problem_set = $arg;
   72       my $ps_arg = shift @components;
   73 
   74       if (!defined $ps_arg) {
   75         # list the problems in the problem set
   76         return WeBWorK::ProblemSet->new($r, $course_env)->go($problem_set);
   77       } elsif ($ps_arg eq "hardcopy") {
   78         ###
   79       }
   80       else {
   81         # We've got the name of a problem
   82         my $problem = $ps_arg;
   83         return WeBWorK::Problem->new($r, $course_env)->go($problem_set, $problem);
   84       }
   85     }
   86 
   87     if (1) {
   88       return WeBWorK::Test->new($r, $course_env)->go;
   89     }
   90   }
   91 
   92   # If the dispatcher doesn't know any modules that want to handle
   93   # the current path, it'll claim that the path does not exist by
   94   # declining the request.
   95   return DECLINED;
   96 }
   97 
   98 1;