IkiWiki/CGI.pm

   1 #!/usr/bin/perl
   2
   3 use warnings;
   4 use strict;
   5 use IkiWiki;
   6 use IkiWiki::UserInfo;
   7 use open qw{:utf8 :std};
   8 use Encode;
   9
  10 package IkiWiki;
  11
  12 sub printheader ($) { #{{{
  13         my $session=shift;
  14
  15         if ($config{sslcookie}) {
  16                 print $session->header(-charset => 'utf-8',
  17                         -cookie => $session->cookie(-secure => 1));
  18         } else {
  19                 print $session->header(-charset => 'utf-8');
  20         }
  21
  22 } #}}}
  23
  24 sub showform ($$$$;@) { #{{{
  25         my $form=shift;
  26         my $buttons=shift;
  27         my $session=shift;
  28         my $cgi=shift;
  29
  30         if (exists $hooks{formbuilder}) {
  31                 run_hooks(formbuilder => sub {
  32                         shift->(form => $form, cgi => $cgi, session => $session,
  33                                 buttons => $buttons);
  34                 });
  35         }
  36
  37         printheader($session);
  38         print misctemplate($form->title, $form->render(submit => $buttons), @_);
  39 }
  40
  41 sub redirect ($$) { #{{{
  42         my $q=shift;
  43         my $url=shift;
  44         if (! $config{w3mmode}) {
  45                 print $q->redirect($url);
  46         }
  47         else {
  48                 print "Content-type: text/plain\n";
  49                 print "W3m-control: GOTO $url\n\n";
  50         }
  51 } #}}}
  52
  53 sub check_canedit ($$$;$) { #{{{
  54         my $page=shift;
  55         my $q=shift;
  56         my $session=shift;
  57         my $nonfatal=shift;
  58
  59         my $canedit;
  60         run_hooks(canedit => sub {
  61                 return if defined $canedit;
  62                 my $ret=shift->($page, $q, $session);
  63                 if (defined $ret) {
  64                         if ($ret eq "") {
  65                                 $canedit=1;
  66                         }
  67                         elsif (ref $ret eq 'CODE') {
  68                                 $ret->() unless $nonfatal;
  69                                 $canedit=0;
  70                         }
  71                         elsif (defined $ret) {
  72                                 error($ret) unless $nonfatal;
  73                                 $canedit=0;
  74                         }
  75                 }
  76         });
  77         return $canedit;
  78 } #}}}
  79
  80 sub decode_form_utf8 ($) { #{{{
  81         my $form = shift;
  82         foreach my $f ($form->field) {
  83                 $form->field(name  => $f,
  84                              value => decode_utf8($form->field($f)),
  85                              force => 1,
  86                 );
  87         }
  88 } #}}}
  89
  90 # Check if the user is signed in. If not, redirect to the signin form and
  91 # save their place to return to later.
  92 sub needsignin ($$) { #{{{
  93         my $q=shift;
  94         my $session=shift;
  95
  96         if (! defined $session->param("name") ||
  97             ! userinfo_get($session->param("name"), "regdate")) {
  98                 $session->param(postsignin => $ENV{QUERY_STRING});
  99                 cgi_signin($q, $session);
 100                 cgi_savesession($session);
 101                 exit;
 102         }
 103 } #}}}
 104
 105 sub cgi_signin ($$) { #{{{
 106         my $q=shift;
 107         my $session=shift;
 108
 109         eval q{use CGI::FormBuilder};
 110         error($@) if $@;
 111         my $form = CGI::FormBuilder->new(
 112                 title => "signin",
 113                 name => "signin",
 114                 charset => "utf-8",
 115                 method => 'POST',
 116                 required => 'NONE',
 117                 javascript => 0,
 118                 params => $q,
 119                 action => $config{cgiurl},
 120                 header => 0,
 121                 template => {type => 'div'},
 122                 stylesheet => baseurl()."style.css",
 123         );
 124         my $buttons=["Login"];
 125
 126         if ($q->param("do") ne "signin" && !$form->submitted) {
 127                 $form->text(gettext("You need to log in first."));
 128         }
 129         $form->field(name => "do", type => "hidden", value => "signin",
 130                 force => 1);
 131
 132         decode_form_utf8($form);
 133         run_hooks(formbuilder_setup => sub {
 134                 shift->(form => $form, cgi => $q, session => $session,
 135                         buttons => $buttons);
 136         });
 137         decode_form_utf8($form);
 138
 139         if ($form->submitted) {
 140                 $form->validate;
 141         }
 142
 143         showform($form, $buttons, $session, $q);
 144 } #}}}
 145
 146 sub cgi_postsignin ($$) { #{{{
 147         my $q=shift;
 148         my $session=shift;
 149
 150         # Continue with whatever was being done before the signin process.
 151         if (defined $session->param("postsignin")) {
 152                 my $postsignin=CGI->new($session->param("postsignin"));
 153                 $session->clear("postsignin");
 154                 cgi($postsignin, $session);
 155                 cgi_savesession($session);
 156                 exit;
 157         }
 158         else {
 159                 error(gettext("login failed, perhaps you need to turn on cookies?"));
 160         }
 161 } #}}}
 162
 163 sub cgi_prefs ($$) { #{{{
 164         my $q=shift;
 165         my $session=shift;
 166
 167         needsignin($q, $session);
 168
 169         # The session id is stored on the form and checked to
 170         # guard against CSRF.
 171         my $sid=$q->param('sid');
 172         if (! defined $sid) {
 173                 $q->delete_all;
 174         }
 175         elsif ($sid ne $session->id) {
 176                 error(gettext("Your login session has expired."));
 177         }
 178
 179         eval q{use CGI::FormBuilder};
 180         error($@) if $@;
 181         my $form = CGI::FormBuilder->new(
 182                 title => "preferences",
 183                 name => "preferences",
 184                 header => 0,
 185                 charset => "utf-8",
 186                 method => 'POST',
 187                 validate => {
 188                         email => 'EMAIL',
 189                 },
 190                 required => 'NONE',
 191                 javascript => 0,
 192                 params => $q,
 193                 action => $config{cgiurl},
 194                 template => {type => 'div'},
 195                 stylesheet => baseurl()."style.css",
 196                 fieldsets => [
 197                         [login => gettext("Login")],
 198                         [preferences => gettext("Preferences")],
 199                         [admin => gettext("Admin")]
 200                 ],
 201         );
 202         my $buttons=["Save Preferences", "Logout", "Cancel"];
 203
 204         decode_form_utf8($form);
 205         run_hooks(formbuilder_setup => sub {
 206                 shift->(form => $form, cgi => $q, session => $session,
 207                         buttons => $buttons);
 208         });
 209         decode_form_utf8($form);
 210
 211         $form->field(name => "do", type => "hidden", value => "prefs",
 212                 force => 1);
 213         $form->field(name => "sid", type => "hidden", value => $session->id,
 214                 force => 1);
 215         $form->field(name => "email", size => 50, fieldset => "preferences");
 216         $form->field(name => "banned_users", size => 50,
 217                 fieldset => "admin");
 218
 219         my $user_name=$session->param("name");
 220         if (! is_admin($user_name)) {
 221                 $form->field(name => "banned_users", type => "hidden");
 222         }
 223
 224         if (! $form->submitted) {
 225                 $form->field(name => "email", force => 1,
 226                         value => userinfo_get($user_name, "email"));
 227                 if (is_admin($user_name)) {
 228                         $form->field(name => "banned_users", force => 1,
 229                                 value => join(" ", get_banned_users()));
 230                 }
 231         }
 232
 233         if ($form->submitted eq 'Logout') {
 234                 $session->delete();
 235                 redirect($q, $config{url});
 236                 return;
 237         }
 238         elsif ($form->submitted eq 'Cancel') {
 239                 redirect($q, $config{url});
 240                 return;
 241         }
 242         elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
 243                 if (defined $form->field('email')) {
 244                         userinfo_set($user_name, 'email', $form->field('email')) ||
 245                                 error("failed to set email");
 246                 }
 247                 if (is_admin($user_name)) {
 248                         set_banned_users(grep { ! is_admin($_) }
 249                                         split(' ',
 250                                                 $form->field("banned_users"))) ||
 251                                 error("failed saving changes");
 252                 }
 253                 $form->text(gettext("Preferences saved."));
 254         }
 255
 256         showform($form, $buttons, $session, $q);
 257 } #}}}
 258
 259 sub cgi_editpage ($$) { #{{{
 260         my $q=shift;
 261         my $session=shift;
 262
 263         my @fields=qw(do rcsinfo subpage from page type editcontent comments);
 264         my @buttons=("Save Page", "Preview", "Cancel");
 265         eval q{use CGI::FormBuilder};
 266         error($@) if $@;
 267         my $form = CGI::FormBuilder->new(
 268                 title => "editpage",
 269                 fields => \@fields,
 270                 charset => "utf-8",
 271                 method => 'POST',
 272                 required => [qw{editcontent}],
 273                 javascript => 0,
 274                 params => $q,
 275                 action => $config{cgiurl},
 276                 header => 0,
 277                 table => 0,
 278                 template => scalar template_params("editpage.tmpl"),
 279                 wikiname => $config{wikiname},
 280         );
 281
 282         decode_form_utf8($form);
 283         run_hooks(formbuilder_setup => sub {
 284                 shift->(form => $form, cgi => $q, session => $session,
 285                         buttons => \@buttons);
 286         });
 287         decode_form_utf8($form);
 288
 289         # This untaint is safe because titlepage removes any problematic
 290         # characters.
 291         my ($page)=$form->field('page');
 292         $page=titlepage(possibly_foolish_untaint($page));
 293         if (! defined $page || ! length $page ||
 294             file_pruned($page, $config{srcdir}) || $page=~/^\//) {
 295                 error("bad page name");
 296         }
 297
 298         my $baseurl=$config{url}."/".htmlpage($page);
 299
 300         my $from;
 301         if (defined $form->field('from')) {
 302                 ($from)=$form->field('from')=~/$config{wiki_file_regexp}/;
 303         }
 304
 305         my $file;
 306         my $type;
 307         if (exists $pagesources{$page} && $form->field("do") ne "create") {
 308                 $file=$pagesources{$page};
 309                 $type=pagetype($file);
 310                 if (! defined $type || $type=~/^_/) {
 311                         error(sprintf(gettext("%s is not an editable page"), $page));
 312                 }
 313                 if (! $form->submitted) {
 314                         $form->field(name => "rcsinfo",
 315                                 value => rcs_prepedit($file), force => 1);
 316                 }
 317                 $form->field(name => "editcontent", validate => '/.*/');
 318         }
 319         else {
 320                 $type=$form->param('type');
 321                 if (defined $type && length $type && $hooks{htmlize}{$type}) {
 322                         $type=possibly_foolish_untaint($type);
 323                 }
 324                 elsif (defined $from && exists $pagesources{$from}) {
 325                         # favor the type of linking page
 326                         $type=pagetype($pagesources{$from});
 327                 }
 328                 $type=$config{default_pageext} unless defined $type;
 329                 $file=$page.".".$type;
 330                 if (! $form->submitted) {
 331                         $form->field(name => "rcsinfo", value => "", force => 1);
 332                 }
 333                 $form->field(name => "editcontent", validate => '/.+/');
 334         }
 335
 336         $form->field(name => "do", type => 'hidden');
 337         $form->field(name => "sid", type => "hidden", value => $session->id,
 338                 force => 1);
 339         $form->field(name => "from", type => 'hidden');
 340         $form->field(name => "rcsinfo", type => 'hidden');
 341         $form->field(name => "subpage", type => 'hidden');
 342         $form->field(name => "page", value => pagetitle($page, 1), force => 1);
 343         $form->field(name => "type", value => $type, force => 1);
 344         $form->field(name => "comments", type => "text", size => 80);
 345         $form->field(name => "editcontent", type => "textarea", rows => 20,
 346                 cols => 80);
 347         $form->tmpl_param("can_commit", $config{rcs});
 348         $form->tmpl_param("indexlink", indexlink());
 349         $form->tmpl_param("helponformattinglink",
 350                 htmllink($page, $page, "ikiwiki/formatting",
 351                         noimageinline => 1,
 352                         linktext => "FormattingHelp"));
 353
 354         if ($form->submitted eq "Cancel") {
 355                 if ($form->field("do") eq "create" && defined $from) {
 356                         redirect($q, "$config{url}/".htmlpage($from));
 357                 }
 358                 elsif ($form->field("do") eq "create") {
 359                         redirect($q, $config{url});
 360                 }
 361                 else {
 362                         redirect($q, "$config{url}/".htmlpage($page));
 363                 }
 364                 return;
 365         }
 366         elsif ($form->submitted eq "Preview") {
 367                 my $new=not exists $pagesources{$page};
 368                 if ($new) {
 369                         # temporarily record its type
 370                         $pagesources{$page}=$page.".".$type;
 371                 }
 372
 373                 my $content=$form->field('editcontent');
 374
 375                 run_hooks(editcontent => sub {
 376                         $content=shift->(
 377                                 content => $content,
 378                                 page => $page,
 379                                 cgi => $q,
 380                                 session => $session,
 381                         );
 382                 });
 383                 $form->tmpl_param("page_preview",
 384                         htmlize($page, $type,
 385                         linkify($page, $page,
 386                         preprocess($page, $page,
 387                         filter($page, $page, $content), 0, 1))));
 388
 389                 if ($new) {
 390                         delete $pagesources{$page};
 391                 }
 392                 # previewing may have created files on disk
 393                 saveindex();
 394         }
 395         elsif ($form->submitted eq "Save Page") {
 396                 $form->tmpl_param("page_preview", "");
 397         }
 398         $form->tmpl_param("page_conflict", "");
 399
 400         if ($form->submitted ne "Save Page" || ! $form->validate) {
 401                 if ($form->field("do") eq "create") {
 402                         my @page_locs;
 403                         my $best_loc;
 404                         if (! defined $from || ! length $from ||
 405                             $from ne $form->field('from') ||
 406                             file_pruned($from, $config{srcdir}) ||
 407                             $from=~/^\// ||
 408                             $form->submitted eq "Preview") {
 409                                 @page_locs=$best_loc=$page;
 410                         }
 411                         else {
 412                                 my $dir=$from."/";
 413                                 $dir=~s![^/]+/+$!!;
 414
 415                                 if ((defined $form->field('subpage') && length $form->field('subpage')) ||
 416                                     $page eq gettext('discussion')) {
 417                                         $best_loc="$from/$page";
 418                                 }
 419                                 else {
 420                                         $best_loc=$dir.$page;
 421                                 }
 422
 423                                 push @page_locs, $dir.$page;
 424                                 push @page_locs, "$from/$page";
 425                                 while (length $dir) {
 426                                         $dir=~s![^/]+/+$!!;
 427                                         push @page_locs, $dir.$page;
 428                                 }
 429
 430                                 push @page_locs, "$config{userdir}/$page"
 431                                         if length $config{userdir};
 432                         }
 433
 434                         @page_locs = grep {
 435                                 ! exists $pagecase{lc $_}
 436                         } @page_locs;
 437                         if (! @page_locs) {
 438                                 # hmm, someone else made the page in the
 439                                 # meantime?
 440                                 if ($form->submitted eq "Preview") {
 441                                         # let them go ahead with the edit
 442                                         # and resolve the conflict at save
 443                                         # time
 444                                         @page_locs=$page;
 445                                 }
 446                                 else {
 447                                         redirect($q, "$config{url}/".htmlpage($page));
 448                                         return;
 449                                 }
 450                         }
 451
 452                         my @editable_locs = grep {
 453                                 check_canedit($_, $q, $session, 1)
 454                         } @page_locs;
 455                         if (! @editable_locs) {
 456                                 # let it throw an error this time
 457                                 map { check_canedit($_, $q, $session) } @page_locs;
 458                         }
 459
 460                         my @page_types;
 461                         if (exists $hooks{htmlize}) {
 462                                 @page_types=grep { !/^_/ }
 463                                         keys %{$hooks{htmlize}};
 464                         }
 465
 466                         $form->tmpl_param("page_select", 1);
 467                         $form->field(name => "page", type => 'select',
 468                                 options => [ map { pagetitle($_, 1) } @editable_locs ],
 469                                 value => pagetitle($best_loc, 1));
 470                         $form->field(name => "type", type => 'select',
 471                                 options => \@page_types);
 472                         $form->title(sprintf(gettext("creating %s"), pagetitle($page)));
 473
 474                 }
 475                 elsif ($form->field("do") eq "edit") {
 476                         check_canedit($page, $q, $session);
 477                         if (! defined $form->field('editcontent') ||
 478                             ! length $form->field('editcontent')) {
 479                                 my $content="";
 480                                 if (exists $pagesources{$page}) {
 481                                         $content=readfile(srcfile($pagesources{$page}));
 482                                         $content=~s/\n/\r\n/g;
 483                                 }
 484                                 $form->field(name => "editcontent", value => $content,
 485                                         force => 1);
 486                         }
 487                         $form->tmpl_param("page_select", 0);
 488                         $form->field(name => "page", type => 'hidden');
 489                         $form->field(name => "type", type => 'hidden');
 490                         $form->title(sprintf(gettext("editing %s"), pagetitle($page)));
 491                 }
 492
 493                 showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
 494         }
 495         else {
 496                 # save page
 497                 check_canedit($page, $q, $session);
 498
 499                 # The session id is stored on the form and checked to
 500                 # guard against CSRF. But only if the user is logged in,
 501                 # as anonok can allow anonymous edits.
 502                 if (defined $session->param("name")) {
 503                         my $sid=$q->param('sid');
 504                         if (! defined $sid || $sid ne $session->id) {
 505                                 error(gettext("Your login session has expired."));
 506                         }
 507                 }
 508
 509                 my $exists=-e "$config{srcdir}/$file";
 510
 511                 if ($form->field("do") ne "create" && ! $exists &&
 512                     ! defined srcfile($file, 1)) {
 513                         $form->tmpl_param("page_gone", 1);
 514                         $form->field(name => "do", value => "create", force => 1);
 515                         $form->tmpl_param("page_select", 0);
 516                         $form->field(name => "page", type => 'hidden');
 517                         $form->field(name => "type", type => 'hidden');
 518                         $form->title(sprintf(gettext("editing %s"), $page));
 519                         showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
 520                         return;
 521                 }
 522                 elsif ($form->field("do") eq "create" && $exists) {
 523                         $form->tmpl_param("creation_conflict", 1);
 524                         $form->field(name => "do", value => "edit", force => 1);
 525                         $form->tmpl_param("page_select", 0);
 526                         $form->field(name => "page", type => 'hidden');
 527                         $form->field(name => "type", type => 'hidden');
 528                         $form->title(sprintf(gettext("editing %s"), $page));
 529                         $form->field("editcontent",
 530                                 value => readfile("$config{srcdir}/$file").
 531                                          "\n\n\n".$form->field("editcontent"),
 532                                 force => 1);
 533                         showform($form, \@buttons, $session, $q, forcebaseurl => $baseurl);
 534                         return;
 535                 }
 536
 537                 my $content=$form->field('editcontent');
 538                 run_hooks(editcontent => sub {
 539                         $content=shift->(
 540                                 content => $content,
 541                                 page => $page,
 542                                 cgi => $q,
 543                                 session => $session,
 544                         );
 545                 });
 546                 $content=~s/\r\n/\n/g;
 547                 $content=~s/\r/\n/g;
 548                 $content.="\n" if $content !~ /\n$/;
 549
 550                 $config{cgi}=0; # avoid cgi error message
 551                 eval { writefile($file, $config{srcdir}, $content) };
 552                 $config{cgi}=1;
 553                 if ($@) {
 554                         $form->field(name => "rcsinfo", value => rcs_prepedit($file),
 555                                 force => 1);
 556                         $form->tmpl_param("failed_save", 1);
 557                         $form->tmpl_param("error_message", $@);
 558                         $form->field("editcontent", value => $content, force => 1);
 559                         $form->tmpl_param("page_select", 0);
 560                         $form->field(name => "page", type => 'hidden');
 561                         $form->field(name => "type", type => 'hidden');
 562                         $form->title(sprintf(gettext("editing %s"), $page));
 563                         showform($form, \@buttons, $session, $q,
 564                                 forcebaseurl => $baseurl);
 565                         return;
 566                 }
 567
 568                 my $conflict;
 569                 if ($config{rcs}) {
 570                         my $message="";
 571                         if (defined $form->field('comments') &&
 572                             length $form->field('comments')) {
 573                                 $message=$form->field('comments');
 574                         }
 575
 576                         if (! $exists) {
 577                                 rcs_add($file);
 578                         }
 579
 580                         # Prevent deadlock with post-commit hook by
 581                         # signaling to it that it should not try to
 582                         # do anything.
 583                         disable_commit_hook();
 584                         $conflict=rcs_commit($file, $message,
 585                                 $form->field("rcsinfo"),
 586                                 $session->param("name"), $ENV{REMOTE_ADDR});
 587                         enable_commit_hook();
 588                         rcs_update();
 589                 }
 590
 591                 # Refresh even if there was a conflict, since other changes
 592                 # may have been committed while the post-commit hook was
 593                 # disabled.
 594                 require IkiWiki::Render;
 595                 refresh();
 596                 saveindex();
 597
 598                 if (defined $conflict) {
 599                         $form->field(name => "rcsinfo", value => rcs_prepedit($file),
 600                                 force => 1);
 601                         $form->tmpl_param("page_conflict", 1);
 602                         $form->field("editcontent", value => $conflict, force => 1);
 603                         $form->field("do", "edit", force => 1);
 604                         $form->tmpl_param("page_select", 0);
 605                         $form->field(name => "page", type => 'hidden');
 606                         $form->field(name => "type", type => 'hidden');
 607                         $form->title(sprintf(gettext("editing %s"), $page));
 608                         showform($form, \@buttons, $session, $q,
 609                                 forcebaseurl => $baseurl);
 610                         return;
 611                 }
 612                 else {
 613                         # The trailing question mark tries to avoid broken
 614                         # caches and get the most recent version of the page.
 615                         redirect($q, "$config{url}/".htmlpage($page)."?updated");
 616                 }
 617         }
 618 } #}}}
 619
 620 sub cgi_getsession ($) { #{{{
 621         my $q=shift;
 622
 623         eval q{use CGI::Session};
 624         CGI::Session->name("ikiwiki_session_".encode_utf8($config{wikiname}));
 625
 626         my $oldmask=umask(077);
 627         my $session = CGI::Session->new("driver:DB_File", $q,
 628                 { FileName => "$config{wikistatedir}/sessions.db" });
 629         umask($oldmask);
 630
 631         return $session;
 632 } #}}}
 633
 634 sub cgi_savesession ($) { #{{{
 635         my $session=shift;
 636
 637         # Force session flush with safe umask.
 638         my $oldmask=umask(077);
 639         $session->flush;
 640         umask($oldmask);
 641 } #}}}
 642
 643 sub cgi (;$$) { #{{{
 644         my $q=shift;
 645         my $session=shift;
 646
 647         if (! $q) {
 648                 eval q{use CGI};
 649                 error($@) if $@;
 650
 651                 binmode(STDIN);
 652                 $q=CGI->new;
 653                 binmode(STDIN, ":utf8");
 654
 655                 run_hooks(cgi => sub { shift->($q) });
 656         }
 657
 658         my $do=$q->param('do');
 659         if (! defined $do || ! length $do) {
 660                 my $error = $q->cgi_error;
 661                 if ($error) {
 662                         error("Request not processed: $error");
 663                 }
 664                 else {
 665                         error("\"do\" parameter missing");
 666                 }
 667         }
 668
 669         # Need to lock the wiki before getting a session.
 670         lockwiki();
 671         loadindex();
 672
 673         if (! $session) {
 674                 $session=cgi_getsession($q);
 675         }
 676
 677         # Auth hooks can sign a user in.
 678         if ($do ne 'signin' && ! defined $session->param("name")) {
 679                 run_hooks(auth => sub {
 680                         shift->($q, $session)
 681                 });
 682                 if (defined $session->param("name")) {
 683                         # Make sure whatever user was authed is in the
 684                         # userinfo db.
 685                         if (! userinfo_get($session->param("name"), "regdate")) {
 686                                 userinfo_setall($session->param("name"), {
 687                                         email => "",
 688                                         password => "",
 689                                         regdate => time,
 690                                 }) || error("failed adding user");
 691                         }
 692                 }
 693         }
 694
 695         if (defined $session->param("name") &&
 696             userinfo_get($session->param("name"), "banned")) {
 697                 print $q->header(-status => "403 Forbidden");
 698                 $session->delete();
 699                 print gettext("You are banned.");
 700                 cgi_savesession($session);
 701         }
 702
 703         run_hooks(sessioncgi => sub { shift->($q, $session) });
 704
 705         if ($do eq 'signin') {
 706                 cgi_signin($q, $session);
 707                 cgi_savesession($session);
 708         }
 709         elsif ($do eq 'prefs') {
 710                 cgi_prefs($q, $session);
 711         }
 712         elsif ($do eq 'create' || $do eq 'edit') {
 713                 cgi_editpage($q, $session);
 714         }
 715         elsif (defined $session->param("postsignin") || $do eq 'postsignin') {
 716                 cgi_postsignin($q, $session);
 717         }
 718         else {
 719                 error("unknown do parameter");
 720         }
 721 } #}}}
 722
 723 1