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Original Path: trunk/webwork2/lib/WeBWorK.pm
| 1 : | sh002i | 986 | ################################################################################ |
| 2 : | sh002i | 1663 | # WeBWorK Online Homework Delivery System |
| 3 : | # Copyright © 2000-2003 The WeBWorK Project, http://openwebwork.sf.net/ | ||
| 4 : | sh002i | 2368 | # $CVSHeader: webwork-modperl/lib/WeBWorK.pm,v 1.57 2004/06/17 20:10:18 sh002i Exp $ |
| 5 : | sh002i | 1663 | # |
| 6 : | # This program is free software; you can redistribute it and/or modify it under | ||
| 7 : | # the terms of either: (a) the GNU General Public License as published by the | ||
| 8 : | # Free Software Foundation; either version 2, or (at your option) any later | ||
| 9 : | # version, or (b) the "Artistic License" which comes with this package. | ||
| 10 : | # | ||
| 11 : | # This program is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 : | # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | ||
| 13 : | # FOR A PARTICULAR PURPOSE. See either the GNU General Public License or the | ||
| 14 : | # Artistic License for more details. | ||
| 15 : | sh002i | 986 | ################################################################################ |
| 16 : | |||
| 17 : | package WeBWorK; | ||
| 18 : | |||
| 19 : | =head1 NAME | ||
| 20 : | |||
| 21 : | sh002i | 1565 | WeBWorK - Dispatch requests to the appropriate content generator. |
| 22 : | sh002i | 986 | |
| 23 : | sh002i | 1565 | =head1 SYNOPSIS |
| 24 : | |||
| 25 : | my $r = Apache->request; | ||
| 26 : | my $result = eval { WeBWorK::dispatch($r) }; | ||
| 27 : | die "something bad happened: $@" if $@; | ||
| 28 : | |||
| 29 : | =head1 DESCRIPTION | ||
| 30 : | |||
| 31 : | C<WeBWorK> is the dispatcher for the WeBWorK system. Given an Apache request | ||
| 32 : | object, it performs authentication and determines which subclass of | ||
| 33 : | C<WeBWorK::ContentGenerator> to call. | ||
| 34 : | |||
| 35 : | sh002i | 986 | =cut |
| 36 : | |||
| 37 : | sh002i | 1548 | BEGIN { $main::VERSION = "2.0"; } |
| 38 : | |||
| 39 : | sh002i | 986 | use strict; |
| 40 : | use warnings; | ||
| 41 : | gage | 1377 | use Apache::Constants qw(:common REDIRECT DONE); |
| 42 : | sh002i | 2368 | |
| 43 : | # load WeBWorK::Constants before anything else | ||
| 44 : | # this sets package variables in several packages | ||
| 45 : | use WeBWorK::Constants; | ||
| 46 : | |||
| 47 : | # the rest of these are modules that are acutally used by this one | ||
| 48 : | sh002i | 986 | use WeBWorK::Authen; |
| 49 : | use WeBWorK::Authz; | ||
| 50 : | use WeBWorK::CourseEnvironment; | ||
| 51 : | use WeBWorK::DB; | ||
| 52 : | sh002i | 2368 | use WeBWorK::Debug; |
| 53 : | use WeBWorK::Request; | ||
| 54 : | gage | 2098 | use WeBWorK::Timing; |
| 55 : | sh002i | 1616 | use WeBWorK::Upload; |
| 56 : | sh002i | 1836 | use WeBWorK::URLPath; |
| 57 : | sh002i | 2368 | use WeBWorK::Utils qw(runtime_use); |
| 58 : | sh002i | 1836 | |
| 59 : | use constant AUTHEN_MODULE => "WeBWorK::ContentGenerator::Login"; | ||
| 60 : | sh002i | 2313 | use constant FIXDB_MODULE => "WeBWorK::ContentGenerator::FixDB"; |
| 61 : | sh002i | 1836 | |
| 62 : | sh002i | 1879 | sub dispatch($) { |
| 63 : | sh002i | 1836 | my ($apache) = @_; |
| 64 : | my $r = new WeBWorK::Request $apache; | ||
| 65 : | |||
| 66 : | my $method = $r->method; | ||
| 67 : | my $location = $r->location; | ||
| 68 : | my $uri = $r->uri; | ||
| 69 : | my $path_info = $r->path_info | ""; | ||
| 70 : | my $args = $r->args || ""; | ||
| 71 : | my $webwork_root = $r->dir_config("webwork_root"); | ||
| 72 : | my $pg_root = $r->dir_config("pg_root"); | ||
| 73 : | |||
| 74 : | debug("Hi, I'm the new dispatcher!\n"); | ||
| 75 : | debug(("-" x 80) . "\n"); | ||
| 76 : | |||
| 77 : | debug("Okay, I got some basic information:\n"); | ||
| 78 : | debug("The apache location is $location\n"); | ||
| 79 : | debug("The request method is $method\n"); | ||
| 80 : | debug("The URI is $uri\n"); | ||
| 81 : | debug("The path-info is $path_info\n"); | ||
| 82 : | debug("The argument string is $args\n"); | ||
| 83 : | debug("The WeBWorK root directory is $webwork_root\n"); | ||
| 84 : | debug("The PG root directory is $pg_root\n"); | ||
| 85 : | debug(("-" x 80) . "\n"); | ||
| 86 : | |||
| 87 : | debug("The first thing we need to do is munge the path a little:\n"); | ||
| 88 : | |||
| 89 : | my ($path) = $uri =~ m/$location(.*)/; | ||
| 90 : | $path = "/" if $path eq ""; # no path at all | ||
| 91 : | |||
| 92 : | debug("We can't trust the path-info, so we make our own path.\n"); | ||
| 93 : | debug("path-info claims: $path_info\n"); | ||
| 94 : | debug("but it's really: $path\n"); | ||
| 95 : | debug("(if it's empty, we set it to \"/\".)\n"); | ||
| 96 : | |||
| 97 : | $path =~ s|/+|/|g; | ||
| 98 : | debug("...and here it is without repeated slashes: $path\n"); | ||
| 99 : | |||
| 100 : | # lookbehind assertion for "not a slash" | ||
| 101 : | # matches the boundary after the last char | ||
| 102 : | $path =~ s|(?<=[^/])$|/|; | ||
| 103 : | debug("...and here it is with a trailing slash: $path\n"); | ||
| 104 : | |||
| 105 : | debug(("-" x 80) . "\n"); | ||
| 106 : | |||
| 107 : | debug("Now we need to look at the path a little to figure out where we are\n"); | ||
| 108 : | |||
| 109 : | debug("-------------------- call to WeBWorK::URLPath::newFromPath\n"); | ||
| 110 : | sh002i | 1885 | my $urlPath = WeBWorK::URLPath->newFromPath($path); |
| 111 : | sh002i | 1836 | debug("-------------------- call to WeBWorK::URLPath::newFromPath\n"); |
| 112 : | |||
| 113 : | unless ($urlPath) { | ||
| 114 : | debug("This path is invalid... see you later!\n"); | ||
| 115 : | return DECLINED; | ||
| 116 : | } | ||
| 117 : | |||
| 118 : | my $displayModule = $urlPath->module; | ||
| 119 : | my %displayArgs = $urlPath->args; | ||
| 120 : | |||
| 121 : | debug("The display module for this path is: $displayModule\n"); | ||
| 122 : | debug("...and here are the arguments we'll pass to it:\n"); | ||
| 123 : | foreach my $key (keys %displayArgs) { | ||
| 124 : | debug("\t$key => $displayArgs{$key}\n"); | ||
| 125 : | } | ||
| 126 : | |||
| 127 : | unless ($displayModule) { | ||
| 128 : | debug("The display module is empty, so we can DECLINE here.\n"); | ||
| 129 : | return DECLINED; | ||
| 130 : | } | ||
| 131 : | |||
| 132 : | my $selfPath = $urlPath->path; | ||
| 133 : | my $parent = $urlPath->parent; | ||
| 134 : | my $parentPath = $parent ? $parent->path : "<no parent>"; | ||
| 135 : | |||
| 136 : | debug("Reconstructing the original path gets us: $selfPath\n"); | ||
| 137 : | debug("And we can generate the path to our parent, too: $parentPath\n"); | ||
| 138 : | debug("(We could also figure out who our children are, but we'd need to supply additional arguments.)\n"); | ||
| 139 : | debug(("-" x 80) . "\n"); | ||
| 140 : | |||
| 141 : | sh002i | 1885 | debug("The URLPath looks good, we'll add it to the request.\n"); |
| 142 : | $r->urlpath($urlPath); | ||
| 143 : | |||
| 144 : | sh002i | 1836 | debug("Now we want to look at the parameters we got.\n"); |
| 145 : | |||
| 146 : | debug("The raw params:\n"); | ||
| 147 : | foreach my $key ($r->param) { | ||
| 148 : | debug("\t$key\n"); | ||
| 149 : | debug("\t\t$_\n") foreach $r->param($key); | ||
| 150 : | } | ||
| 151 : | |||
| 152 : | sh002i | 1895 | #mungeParams($r); |
| 153 : | sh002i | 1836 | |
| 154 : | debug("The munged params:\n"); | ||
| 155 : | foreach my $key ($r->param) { | ||
| 156 : | debug("\t$key\n"); | ||
| 157 : | debug("\t\t$_\n") foreach $r->param($key); | ||
| 158 : | } | ||
| 159 : | |||
| 160 : | debug(("-" x 80) . "\n"); | ||
| 161 : | |||
| 162 : | sh002i | 2346 | # create a package-global timing object |
| 163 : | sh002i | 2368 | # FIXME: this is used by other modules! |
| 164 : | # FIXME: this is not thread-safe! | ||
| 165 : | my $label = defined $displayArgs{courseID} ? $displayArgs{courseID} : "ROOT"; | ||
| 166 : | $WeBWorK::timer = WeBWorK::Timing->new($label); | ||
| 167 : | $WeBWorK::timer->start; | ||
| 168 : | sh002i | 2346 | |
| 169 : | sh002i | 1836 | debug("We need to get a course environment (with or without a courseID!)\n"); |
| 170 : | my $ce = new WeBWorK::CourseEnvironment($webwork_root, $location, $pg_root, $displayArgs{courseID}); | ||
| 171 : | debug("Here's the course environment: $ce\n"); | ||
| 172 : | sh002i | 1885 | $r->ce($ce); |
| 173 : | sh002i | 1836 | |
| 174 : | sh002i | 1879 | my @uploads = $r->upload; |
| 175 : | foreach my $u (@uploads) { | ||
| 176 : | # make sure it's a "real" upload | ||
| 177 : | next unless $u->filename; | ||
| 178 : | |||
| 179 : | # store the upload | ||
| 180 : | my $upload = WeBWorK::Upload->store($u, | ||
| 181 : | dir => $ce->{webworkDirs}->{uploadCache} | ||
| 182 : | ); | ||
| 183 : | |||
| 184 : | # store the upload ID and hash in the file upload field | ||
| 185 : | my $id = $upload->id; | ||
| 186 : | my $hash = $upload->hash; | ||
| 187 : | $r->param($u->name => "$id $hash"); | ||
| 188 : | } | ||
| 189 : | sh002i | 1836 | |
| 190 : | my ($db, $authz); | ||
| 191 : | |||
| 192 : | if ($displayArgs{courseID}) { | ||
| 193 : | debug("We got a courseID from the URLPath, now we can do some stuff:\n"); | ||
| 194 : | debug("...we can create a database object...\n"); | ||
| 195 : | $db = new WeBWorK::DB($ce->{dbLayout}); | ||
| 196 : | debug("(here's the DB handle: $db)\n"); | ||
| 197 : | sh002i | 1885 | $r->db($db); |
| 198 : | sh002i | 1836 | |
| 199 : | sh002i | 2313 | debug("Now we check the database...\n"); |
| 200 : | debug("(we can detect if a hash-style database from WW1 has not be converted properly.)\n"); | ||
| 201 : | my ($dbOK, @dbMessages) = $db->hashDatabaseOK(0); # 0 == don't fix | ||
| 202 : | if (not $dbOK) { | ||
| 203 : | debug("hashDatabaseOK() returned $dbOK -- looks like trouble...\n"); | ||
| 204 : | $displayModule = FIXDB_MODULE; | ||
| 205 : | debug("set displayModule to $displayModule\n"); | ||
| 206 : | } else { | ||
| 207 : | debug("hashDatabaseOK() returned $dbOK -- leaving displayModule as-is\n"); | ||
| 208 : | } | ||
| 209 : | |||
| 210 : | debug("...and now we can authenticate the remote user...\n"); | ||
| 211 : | sh002i | 1885 | my $authen = new WeBWorK::Authen($r); |
| 212 : | sh002i | 1836 | my $authenOK = $authen->verify; |
| 213 : | if ($authenOK) { | ||
| 214 : | debug("Hi, ", $r->param("user"), ", glad you made it.\n"); | ||
| 215 : | |||
| 216 : | debug("Authentication succeeded, so it makes sense to create an authz object...\n"); | ||
| 217 : | sh002i | 1885 | $authz = new WeBWorK::Authz($r, $ce, $db); |
| 218 : | sh002i | 1836 | debug("(here's the authz object: $authz)\n"); |
| 219 : | sh002i | 1885 | $r->authz($authz); |
| 220 : | sh002i | 1836 | |
| 221 : | debug("Now we deal with the effective user:\n"); | ||
| 222 : | my $userID = $r->param("user"); | ||
| 223 : | my $eUserID = $r->param("effectiveUser") || $userID; | ||
| 224 : | debug("userID=$userID eUserID=$eUserID\n"); | ||
| 225 : | my $su_authorized = $authz->hasPermissions($userID, "become_student", $eUserID); | ||
| 226 : | if ($su_authorized) { | ||
| 227 : | debug("Ok, looks like you're is allowed to become $eUserID. Whoopie!\n"); | ||
| 228 : | } else { | ||
| 229 : | debug("Uh oh, you're isn't allowed to become $eUserID. Nice try!\n"); | ||
| 230 : | $eUserID = $userID; | ||
| 231 : | } | ||
| 232 : | $r->param("effectiveUser" => $eUserID); | ||
| 233 : | } else { | ||
| 234 : | debug("Bad news: authentication failed!\n"); | ||
| 235 : | $displayModule = AUTHEN_MODULE; | ||
| 236 : | debug("set displayModule to $displayModule\n"); | ||
| 237 : | } | ||
| 238 : | } | ||
| 239 : | |||
| 240 : | debug(("-" x 80) . "\n"); | ||
| 241 : | debug("Finally, we'll load the display module...\n"); | ||
| 242 : | |||
| 243 : | runtime_use($displayModule); | ||
| 244 : | |||
| 245 : | debug("...instantiate it...\n"); | ||
| 246 : | |||
| 247 : | my $instance = $displayModule->new($r); | ||
| 248 : | |||
| 249 : | debug("...and call it:\n"); | ||
| 250 : | debug("-------------------- call to ${displayModule}::go\n"); | ||
| 251 : | |||
| 252 : | my $result = $instance->go(); | ||
| 253 : | |||
| 254 : | debug("-------------------- call to ${displayModule}::go\n"); | ||
| 255 : | |||
| 256 : | sh002i | 1910 | debug("returning result: " . (defined $result ? $result : "UNDEF") . "\n"); |
| 257 : | sh002i | 2346 | |
| 258 : | sh002i | 2368 | $WeBWorK::timer->save(); |
| 259 : | sh002i | 2346 | |
| 260 : | gage | 2098 | return $result; |
| 261 : | sh002i | 1836 | |
| 262 : | } | ||
| 263 : | |||
| 264 : | sub mungeParams { | ||
| 265 : | my ($r) = @_; | ||
| 266 : | |||
| 267 : | my @paramQueue; | ||
| 268 : | |||
| 269 : | # remove all the params from the request, and store them in the param queue | ||
| 270 : | foreach my $key ($r->param) { | ||
| 271 : | push @paramQueue, [ $key => [ $r->param($key) ] ]; | ||
| 272 : | $r->parms->unset($key) | ||
| 273 : | } | ||
| 274 : | |||
| 275 : | # exhaust the param queue, decoding encoded params | ||
| 276 : | while (@paramQueue) { | ||
| 277 : | my ($key, $values) = @{ shift @paramQueue }; | ||
| 278 : | |||
| 279 : | if ($key =~ m/\,/) { | ||
| 280 : | # we have multiple params encoded in a single param | ||
| 281 : | # split them up and add them to the end of the queue | ||
| 282 : | push @paramQueue, map { [ $_, $values ] } split m/\,/, $key; | ||
| 283 : | } elsif ($key =~ m/\:/) { | ||
| 284 : | # we have a whole param encoded in a key | ||
| 285 : | # split it up and add it to the end of the queue | ||
| 286 : | my ($newKey, $newValue) = split m/\:/, $key; | ||
| 287 : | push @paramQueue, [ $newKey, [ $newValue ] ]; | ||
| 288 : | } else { | ||
| 289 : | # this is a "normal" param | ||
| 290 : | # add it to the param list | ||
| 291 : | if (defined $r->param($key)) { | ||
| 292 : | # the param already exists -- append the values we have | ||
| 293 : | $r->param($key => [ $r->param($key), @$values ]); | ||
| 294 : | } else { | ||
| 295 : | # the param doesn't exist -- create it with the values we have | ||
| 296 : | $r->param($key => $values); | ||
| 297 : | } | ||
| 298 : | } | ||
| 299 : | } | ||
| 300 : | } | ||
| 301 : | |||
| 302 : | |||
| 303 : | sh002i | 1565 | =head1 AUTHOR |
| 304 : | |||
| 305 : | sh002i | 1616 | Written by Dennis Lambe, malsyned at math.rochester.edu. Modified by Sam |
| 306 : | Hathaway, sh002i at math.rochester.edu. | ||
| 307 : | sh002i | 1565 | |
| 308 : | =cut | ||
| 309 : | |||
| 310 : | sh002i | 986 | 1; |
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