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 redirect ($$) { #{{{
  25         my $q=shift;
  26         my $url=shift;
  27         if (! $config{w3mmode}) {
  28                 print $q->redirect($url);
  29         }
  30         else {
  31                 print "Content-type: text/plain\n";
  32                 print "W3m-control: GOTO $url\n\n";
  33         }
  34 } #}}}
  35
  36 sub check_canedit ($$$;$) { #{{{
  37         my $page=shift;
  38         my $q=shift;
  39         my $session=shift;
  40         my $nonfatal=shift;
  41
  42         my $canedit;
  43         run_hooks(canedit => sub {
  44                 return if defined $canedit;
  45                 my $ret=shift->($page, $q, $session);
  46                 if (defined $ret && $ret eq "") {
  47                         $canedit=1;
  48                 }
  49                 elsif (defined $ret) {
  50                         $canedit=0;
  51                         error($ret) unless $nonfatal;
  52                 }
  53         });
  54         return $canedit;
  55 } #}}}
  56
  57 sub decode_form_utf8 ($) { #{{{
  58         my $form = shift;
  59         foreach my $f ($form->field) {
  60                 next if Encode::is_utf8(scalar $form->field($f));
  61                 $form->field(name  => $f,
  62                              value => decode_utf8($form->field($f)),
  63                              force => 1,
  64                             );
  65         }
  66 } #}}}
  67
  68 sub cgi_recentchanges ($) { #{{{
  69         my $q=shift;
  70
  71         # Optimisation: building recentchanges means calculating lots of
  72         # links. Memoizing htmllink speeds it up a lot (can't be memoized
  73         # during page builds as the return values may change, but they
  74         # won't here.)
  75         eval q{use Memoize};
  76         error($@) if $@;
  77         memoize("htmllink");
  78
  79         eval q{use Time::Duration};
  80         error($@) if $@;
  81
  82         my $changelog=[rcs_recentchanges(100)];
  83         foreach my $change (@$changelog) {
  84                 $change->{when} = concise(ago($change->{when}));
  85
  86                 $change->{user} = userlink($change->{user});
  87
  88                 my $is_excess = exists $change->{pages}[10]; # limit pages to first 10
  89                 delete @{$change->{pages}}[10 .. @{$change->{pages}}] if $is_excess;
  90                 $change->{pages} = [
  91                         map {
  92                                 $_->{link} = htmllink("", "", $_->{page},
  93                                         noimageinline => 1,
  94                                         linktext => pagetitle($_->{page}));
  95                                 $_;
  96                         } @{$change->{pages}}
  97                 ];
  98                 push @{$change->{pages}}, { link => '...' } if $is_excess;
  99         }
 100
 101         my $template=template("recentchanges.tmpl");
 102         $template->param(
 103                 title => "RecentChanges",
 104                 indexlink => indexlink(),
 105                 wikiname => $config{wikiname},
 106                 changelog => $changelog,
 107                 baseurl => baseurl(),
 108         );
 109         run_hooks(pagetemplate => sub {
 110                 shift->(page => "", destpage => "", template => $template);
 111         });
 112         print $q->header(-charset => 'utf-8'), $template->output;
 113 } #}}}
 114
 115 # Check if the user is signed in. If not, redirect to the signin form and
 116 # save their place to return to later.
 117 sub needsignin ($$) { #{{{
 118         my $q=shift;
 119         my $session=shift;
 120
 121         if (! defined $session->param("name") ||
 122             ! userinfo_get($session->param("name"), "regdate")) {
 123                 if (! defined $session->param("postsignin")) {
 124                         $session->param(postsignin => $ENV{QUERY_STRING});
 125                 }
 126                 cgi_signin($q, $session);
 127                 cgi_savesession($session);
 128                 exit;
 129         }
 130 } #}}}
 131
 132 sub cgi_signin ($$) { #{{{
 133         my $q=shift;
 134         my $session=shift;
 135
 136         eval q{use CGI::FormBuilder};
 137         error($@) if $@;
 138         my $form = CGI::FormBuilder->new(
 139                 title => "signin",
 140                 name => "signin",
 141                 charset => "utf-8",
 142                 method => 'POST',
 143                 required => 'NONE',
 144                 javascript => 0,
 145                 params => $q,
 146                 action => $config{cgiurl},
 147                 header => 0,
 148                 template => {type => 'div'},
 149                 stylesheet => baseurl()."style.css",
 150         );
 151         my $buttons=["Login"];
 152
 153         if ($q->param("do") ne "signin" && !$form->submitted) {
 154                 $form->text(gettext("You need to log in first."));
 155         }
 156         $form->field(name => "do", type => "hidden", value => "signin",
 157                 force => 1);
 158
 159         run_hooks(formbuilder_setup => sub {
 160                 shift->(form => $form, cgi => $q, session => $session,
 161                         buttons => $buttons);
 162         });
 163
 164         decode_form_utf8($form);
 165
 166         if (exists $hooks{formbuilder}) {
 167                 run_hooks(formbuilder => sub {
 168                         shift->(form => $form, cgi => $q, session => $session,
 169                                 buttons => $buttons);
 170                 });
 171         }
 172         else {
 173                 if ($form->submitted) {
 174                         $form->validate;
 175                 }
 176                 printheader($session);
 177                 print misctemplate($form->title, $form->render(submit => $buttons));
 178         }
 179 } #}}}
 180
 181 sub cgi_postsignin ($$) { #{{{
 182         my $q=shift;
 183         my $session=shift;
 184
 185         # Continue with whatever was being done before the signin process.
 186         if (defined $session->param("postsignin")) {
 187                 my $postsignin=CGI->new($session->param("postsignin"));
 188                 $session->clear("postsignin");
 189                 cgi($postsignin, $session);
 190                 cgi_savesession($session);
 191                 exit;
 192         }
 193         else {
 194                 # This can occur, for example, if a user went to the signin
 195                 # url via a bookmark.
 196                 redirect($q, $config{url});
 197         }
 198 } #}}}
 199
 200 sub cgi_prefs ($$) { #{{{
 201         my $q=shift;
 202         my $session=shift;
 203
 204         needsignin($q, $session);
 205
 206         eval q{use CGI::FormBuilder};
 207         error($@) if $@;
 208         my $form = CGI::FormBuilder->new(
 209                 title => "preferences",
 210                 name => "preferences",
 211                 header => 0,
 212                 charset => "utf-8",
 213                 method => 'POST',
 214                 validate => {
 215                         email => 'EMAIL',
 216                 },
 217                 required => 'NONE',
 218                 javascript => 0,
 219                 params => $q,
 220                 action => $config{cgiurl},
 221                 template => {type => 'div'},
 222                 stylesheet => baseurl()."style.css",
 223                 fieldsets => [
 224                         [login => gettext("Login")],
 225                         [preferences => gettext("Preferences")],
 226                         [admin => gettext("Admin")]
 227                 ],
 228         );
 229         my $buttons=["Save Preferences", "Logout", "Cancel"];
 230
 231         run_hooks(formbuilder_setup => sub {
 232                 shift->(form => $form, cgi => $q, session => $session,
 233                         buttons => $buttons);
 234         });
 235
 236         $form->field(name => "do", type => "hidden");
 237         $form->field(name => "email", size => 50, fieldset => "preferences");
 238         $form->field(name => "subscriptions", size => 50,
 239                 fieldset => "preferences",
 240                 comment => "(".htmllink("", "", "PageSpec", noimageinline => 1).")");
 241         $form->field(name => "banned_users", size => 50,
 242                 fieldset => "admin");
 243
 244         my $user_name=$session->param("name");
 245         if (! is_admin($user_name)) {
 246                 $form->field(name => "banned_users", type => "hidden");
 247         }
 248
 249         if (! $form->submitted) {
 250                 $form->field(name => "email", force => 1,
 251                         value => userinfo_get($user_name, "email"));
 252                 $form->field(name => "subscriptions", force => 1,
 253                         value => userinfo_get($user_name, "subscriptions"));
 254                 if (is_admin($user_name)) {
 255                         $form->field(name => "banned_users", force => 1,
 256                                 value => join(" ", get_banned_users()));
 257                 }
 258         }
 259
 260         decode_form_utf8($form);
 261
 262         if ($form->submitted eq 'Logout') {
 263                 $session->delete();
 264                 redirect($q, $config{url});
 265                 return;
 266         }
 267         elsif ($form->submitted eq 'Cancel') {
 268                 redirect($q, $config{url});
 269                 return;
 270         }
 271         elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
 272                 foreach my $field (qw(email subscriptions)) {
 273                         if (defined $form->field($field) && length $form->field($field)) {
 274                                 userinfo_set($user_name, $field, $form->field($field)) ||
 275                                         error("failed to set $field");
 276                         }
 277                 }
 278                 if (is_admin($user_name)) {
 279                         set_banned_users(grep { ! is_admin($_) }
 280                                         split(' ',
 281                                                 $form->field("banned_users"))) ||
 282                                 error("failed saving changes");
 283                 }
 284                 $form->text(gettext("Preferences saved."));
 285         }
 286
 287         if (exists $hooks{formbuilder}) {
 288                 run_hooks(formbuilder => sub {
 289                         shift->(form => $form, cgi => $q, session => $session,
 290                                 buttons => $buttons);
 291                 });
 292         }
 293         else {
 294                 printheader($session);
 295                 print misctemplate($form->title, $form->render(submit => $buttons));
 296         }
 297 } #}}}
 298
 299 sub cgi_editpage ($$) { #{{{
 300         my $q=shift;
 301         my $session=shift;
 302
 303         my @fields=qw(do rcsinfo subpage from page type editcontent comments);
 304         my @buttons=("Save Page", "Preview", "Cancel");
 305
 306         eval q{use CGI::FormBuilder};
 307         error($@) if $@;
 308         my $form = CGI::FormBuilder->new(
 309                 title => "editpage",
 310                 fields => \@fields,
 311                 charset => "utf-8",
 312                 method => 'POST',
 313                 validate => {
 314                         editcontent => '/.+/',
 315                 },
 316                 required => [qw{editcontent}],
 317                 javascript => 0,
 318                 params => $q,
 319                 action => $config{cgiurl},
 320                 header => 0,
 321                 table => 0,
 322                 template => scalar template_params("editpage.tmpl"),
 323                 wikiname => $config{wikiname},
 324         );
 325
 326         run_hooks(formbuilder_setup => sub {
 327                 shift->(form => $form, cgi => $q, session => $session,
 328                         buttons => \@buttons);
 329         });
 330
 331         decode_form_utf8($form);
 332
 333         # This untaint is safe because titlepage removes any problematic
 334         # characters.
 335         my ($page)=$form->field('page');
 336         $page=titlepage(possibly_foolish_untaint($page));
 337         if (! defined $page || ! length $page || file_pruned($page, $config{srcdir}) || $page=~/^\//) {
 338                 error("bad page name");
 339         }
 340
 341         my $from;
 342         if (defined $form->field('from')) {
 343                 ($from)=$form->field('from')=~/$config{wiki_file_regexp}/;
 344         }
 345
 346         my $file;
 347         my $type;
 348         if (exists $pagesources{$page} && $form->field("do") ne "create") {
 349                 $file=$pagesources{$page};
 350                 $type=pagetype($file);
 351                 if (! defined $type) {
 352                         error(sprintf(gettext("%s is not an editable page"), $page));
 353                 }
 354                 if (! $form->submitted) {
 355                         $form->field(name => "rcsinfo",
 356                                 value => rcs_prepedit($file), force => 1);
 357                 }
 358         }
 359         else {
 360                 $type=$form->param('type');
 361                 if (defined $type && length $type && $hooks{htmlize}{$type}) {
 362                         $type=possibly_foolish_untaint($type);
 363                 }
 364                 elsif (defined $from) {
 365                         # favor the type of linking page
 366                         $type=pagetype($pagesources{$from});
 367                 }
 368                 $type=$config{default_pageext} unless defined $type;
 369                 $file=$page.".".$type;
 370                 if (! $form->submitted) {
 371                         $form->field(name => "rcsinfo", value => "", force => 1);
 372                 }
 373         }
 374
 375         $form->field(name => "do", type => 'hidden');
 376         $form->field(name => "from", type => 'hidden');
 377         $form->field(name => "rcsinfo", type => 'hidden');
 378         $form->field(name => "subpage", type => 'hidden');
 379         $form->field(name => "page", value => pagetitle($page, 1), force => 1);
 380         $form->field(name => "type", value => $type, force => 1);
 381         $form->field(name => "comments", type => "text", size => 80);
 382         $form->field(name => "editcontent", type => "textarea", rows => 20,
 383                 cols => 80);
 384         $form->tmpl_param("can_commit", $config{rcs});
 385         $form->tmpl_param("indexlink", indexlink());
 386         $form->tmpl_param("helponformattinglink",
 387                 htmllink("", "", "HelpOnFormatting", noimageinline => 1));
 388         $form->tmpl_param("baseurl", baseurl());
 389
 390         if ($form->submitted eq "Cancel") {
 391                 if ($form->field("do") eq "create" && defined $from) {
 392                         redirect($q, "$config{url}/".htmlpage($from));
 393                 }
 394                 elsif ($form->field("do") eq "create") {
 395                         redirect($q, $config{url});
 396                 }
 397                 else {
 398                         redirect($q, "$config{url}/".htmlpage($page));
 399                 }
 400                 return;
 401         }
 402         elsif ($form->submitted eq "Preview") {
 403                 $form->tmpl_param("page_preview",
 404                         htmlize($page, $type,
 405                         linkify($page, "",
 406                         preprocess($page, $page,
 407                         filter($page, $page, $form->field('editcontent')), 0, 1))));
 408         }
 409         elsif ($form->submitted eq "Save Page") {
 410                 $form->tmpl_param("page_preview", "");
 411         }
 412         $form->tmpl_param("page_conflict", "");
 413
 414         if ($form->submitted ne "Save Page" ||
 415             ! $form->validate) {
 416                 if ($form->field("do") eq "create") {
 417                         my @page_locs;
 418                         my $best_loc;
 419                         if (! defined $from || ! length $from ||
 420                             $from ne $form->field('from') ||
 421                             file_pruned($from, $config{srcdir}) ||
 422                             $from=~/^\// ||
 423                             $form->submitted eq "Preview") {
 424                                 @page_locs=$best_loc=$page;
 425                         }
 426                         else {
 427                                 my $dir=$from."/";
 428                                 $dir=~s![^/]+/+$!!;
 429
 430                                 if ((defined $form->field('subpage') && length $form->field('subpage')) ||
 431                                     $page eq gettext('discussion')) {
 432                                         $best_loc="$from/$page";
 433                                 }
 434                                 else {
 435                                         $best_loc=$dir.$page;
 436                                 }
 437
 438                                 push @page_locs, $dir.$page;
 439                                 push @page_locs, "$from/$page";
 440                                 while (length $dir) {
 441                                         $dir=~s![^/]+/+$!!;
 442                                         push @page_locs, $dir.$page;
 443                                 }
 444                         }
 445                         push @page_locs, "$config{userdir}/$page"
 446                                 if length $config{userdir};
 447
 448                         @page_locs = grep {
 449                                 ! exists $pagecase{lc $_}
 450                         } @page_locs;
 451                         if (! @page_locs) {
 452                                 # hmm, someone else made the page in the
 453                                 # meantime?
 454                                 redirect($q, "$config{url}/".htmlpage($page));
 455                                 return;
 456                         }
 457
 458                         my @editable_locs = grep {
 459                                 check_canedit($_, $q, $session, 1)
 460                         } @page_locs;
 461                         if (! @editable_locs) {
 462                                 # let it throw an error this time
 463                                 map { check_canedit($_, $q, $session) } @page_locs;
 464                         }
 465
 466                         my @page_types;
 467                         if (exists $hooks{htmlize}) {
 468                                 @page_types=keys %{$hooks{htmlize}};
 469                         }
 470
 471                         $form->tmpl_param("page_select", 1);
 472                         $form->field(name => "page", type => 'select',
 473                                 options => [ map { pagetitle($_, 1) } @editable_locs ],
 474                                 value => pagetitle($best_loc, 1));
 475                         $form->field(name => "type", type => 'select',
 476                                 options => \@page_types);
 477                         $form->title(sprintf(gettext("creating %s"), pagetitle($page)));
 478
 479                 }
 480                 elsif ($form->field("do") eq "edit") {
 481                         check_canedit($page, $q, $session);
 482                         if (! defined $form->field('editcontent') ||
 483                             ! length $form->field('editcontent')) {
 484                                 my $content="";
 485                                 if (exists $pagesources{$page}) {
 486                                         $content=readfile(srcfile($pagesources{$page}));
 487                                         $content=~s/\n/\r\n/g;
 488                                 }
 489                                 $form->field(name => "editcontent", value => $content,
 490                                         force => 1);
 491                         }
 492                         $form->tmpl_param("page_select", 0);
 493                         $form->field(name => "page", type => 'hidden');
 494                         $form->field(name => "type", type => 'hidden');
 495                         $form->title(sprintf(gettext("editing %s"), pagetitle($page)));
 496                 }
 497
 498                 printheader($session);
 499                 print misctemplate($form->title, $form->render(submit => \@buttons));
 500         }
 501         else {
 502                 # save page
 503                 check_canedit($page, $q, $session);
 504
 505                 my $exists=-e "$config{srcdir}/$file";
 506
 507                 if ($form->field("do") ne "create" &&
 508                     ! $exists && ! -e "$config{underlaydir}/$file") {
 509                         $form->tmpl_param("page_gone", 1);
 510                         $form->field(name => "do", value => "create", force => 1);
 511                         $form->tmpl_param("page_select", 0);
 512                         $form->field(name => "page", type => 'hidden');
 513                         $form->field(name => "type", type => 'hidden');
 514                         $form->title(sprintf(gettext("editing %s"), $page));
 515                         printheader($session);
 516                         print misctemplate($form->title, $form->render(submit => \@buttons));
 517                         return;
 518                 }
 519                 elsif ($form->field("do") eq "create" && $exists) {
 520                         $form->tmpl_param("creation_conflict", 1);
 521                         $form->field(name => "do", value => "edit", force => 1);
 522                         $form->tmpl_param("page_select", 0);
 523                         $form->field(name => "page", type => 'hidden');
 524                         $form->field(name => "type", type => 'hidden');
 525                         $form->title(sprintf(gettext("editing %s"), $page));
 526                         $form->field("editcontent",
 527                                 value => readfile("$config{srcdir}/$file").
 528                                          "\n\n\n".$form->field("editcontent"),
 529                                 force => 1);
 530                         printheader($session);
 531                         print misctemplate($form->title, $form->render(submit => \@buttons));
 532                         return;
 533                 }
 534
 535                 my $content=$form->field('editcontent');
 536
 537                 $content=~s/\r\n/\n/g;
 538                 $content=~s/\r/\n/g;
 539
 540                 $config{cgi}=0; # avoid cgi error message
 541                 eval { writefile($file, $config{srcdir}, $content) };
 542                 $config{cgi}=1;
 543                 if ($@) {
 544                         $form->field(name => "rcsinfo", value => rcs_prepedit($file),
 545                                 force => 1);
 546                         $form->tmpl_param("failed_save", 1);
 547                         $form->tmpl_param("error_message", $@);
 548                         $form->field("editcontent", value => $content, force => 1);
 549                         $form->tmpl_param("page_select", 0);
 550                         $form->field(name => "page", type => 'hidden');
 551                         $form->field(name => "type", type => 'hidden');
 552                         $form->title(sprintf(gettext("editing %s"), $page));
 553                         printheader($session);
 554                         print misctemplate($form->title, $form->render(submit => \@buttons));
 555                         return;
 556                 }
 557
 558                 my $conflict;
 559                 if ($config{rcs}) {
 560                         my $message="";
 561                         if (defined $form->field('comments') &&
 562                             length $form->field('comments')) {
 563                                 $message=$form->field('comments');
 564                         }
 565
 566                         if (! $exists) {
 567                                 rcs_add($file);
 568                         }
 569
 570                         # Prevent deadlock with post-commit hook by
 571                         # signaling to it that it should not try to
 572                         # do anything (except send commit mails).
 573                         disable_commit_hook();
 574                         $conflict=rcs_commit($file, $message,
 575                                 $form->field("rcsinfo"),
 576                                 $session->param("name"), $ENV{REMOTE_ADDR});
 577                         enable_commit_hook();
 578                         rcs_update();
 579                 }
 580
 581                 # Refresh even if there was a conflict, since other changes
 582                 # may have been committed while the post-commit hook was
 583                 # disabled.
 584                 require IkiWiki::Render;
 585                 refresh();
 586                 saveindex();
 587
 588                 if (defined $conflict) {
 589                         $form->field(name => "rcsinfo", value => rcs_prepedit($file),
 590                                 force => 1);
 591                         $form->tmpl_param("page_conflict", 1);
 592                         $form->field("editcontent", value => $conflict, force => 1);
 593                         $form->field("do", "edit", force => 1);
 594                         $form->tmpl_param("page_select", 0);
 595                         $form->field(name => "page", type => 'hidden');
 596                         $form->field(name => "type", type => 'hidden');
 597                         $form->title(sprintf(gettext("editing %s"), $page));
 598                         printheader($session);
 599                         print misctemplate($form->title, $form->render(submit => \@buttons));
 600                         return;
 601                 }
 602                 else {
 603                         # The trailing question mark tries to avoid broken
 604                         # caches and get the most recent version of the page.
 605                         redirect($q, "$config{url}/".htmlpage($page)."?updated");
 606                 }
 607         }
 608 } #}}}
 609
 610 sub cgi_getsession ($) { #{{{
 611         my $q=shift;
 612
 613         eval q{use CGI::Session};
 614         CGI::Session->name("ikiwiki_session_".encode_utf8($config{wikiname}));
 615
 616         my $oldmask=umask(077);
 617         my $session = CGI::Session->new("driver:DB_File", $q,
 618                 { FileName => "$config{wikistatedir}/sessions.db" });
 619         umask($oldmask);
 620
 621         return $session;
 622 } #}}}
 623
 624 sub cgi_savesession ($) { #{{{
 625         my $session=shift;
 626
 627         # Force session flush with safe umask.
 628         my $oldmask=umask(077);
 629         $session->flush;
 630         umask($oldmask);
 631 } #}}}
 632
 633 sub cgi (;$$) { #{{{
 634         my $q=shift;
 635         my $session=shift;
 636
 637         if (! $q) {
 638                 eval q{use CGI};
 639                 error($@) if $@;
 640
 641                 $q=CGI->new;
 642
 643                 run_hooks(cgi => sub { shift->($q) });
 644         }
 645
 646         my $do=$q->param('do');
 647         if (! defined $do || ! length $do) {
 648                 my $error = $q->cgi_error;
 649                 if ($error) {
 650                         error("Request not processed: $error");
 651                 }
 652                 else {
 653                         error("\"do\" parameter missing");
 654                 }
 655         }
 656
 657         # Things that do not need a session.
 658         if ($do eq 'recentchanges') {
 659                 cgi_recentchanges($q);
 660                 return;
 661         }
 662
 663         # Need to lock the wiki before getting a session.
 664         lockwiki();
 665
 666         if (! $session) {
 667                 $session=cgi_getsession($q);
 668         }
 669
 670         # Auth hooks can sign a user in.
 671         if ($do ne 'signin' && ! defined $session->param("name")) {
 672                 run_hooks(auth => sub {
 673                         shift->($q, $session)
 674                 });
 675                 if (defined $session->param("name")) {
 676                         # Make sure whatever user was authed is in the
 677                         # userinfo db.
 678                         if (! userinfo_get($session->param("name"), "regdate")) {
 679                                 userinfo_setall($session->param("name"), {
 680                                         email => "",
 681                                         password => "",
 682                                         regdate => time,
 683                                 }) || error("failed adding user");
 684                         }
 685                 }
 686         }
 687
 688         if (defined $session->param("name") &&
 689             userinfo_get($session->param("name"), "banned")) {
 690                 print $q->header(-status => "403 Forbidden");
 691                 $session->delete();
 692                 print gettext("You are banned.");
 693                 cgi_savesession($session);
 694         }
 695
 696         run_hooks(sessioncgi => sub { shift->($q, $session) });
 697
 698         if ($do eq 'signin') {
 699                 cgi_signin($q, $session);
 700                 cgi_savesession($session);
 701         }
 702         elsif (defined $session->param("postsignin")) {
 703                 cgi_postsignin($q, $session);
 704         }
 705         elsif ($do eq 'prefs') {
 706                 cgi_prefs($q, $session);
 707         }
 708         elsif ($do eq 'create' || $do eq 'edit') {
 709                 cgi_editpage($q, $session);
 710         }
 711         elsif ($do eq 'postsignin') {
 712                 error(gettext("login failed, perhaps you need to turn on cookies?"));
 713         }
 714         else {
 715                 error("unknown do parameter");
 716         }
 717 } #}}}
 718
 719 sub userlink ($) { #{{{
 720         my $user=shift;
 721
 722         eval q{use CGI 'escapeHTML'};
 723         error($@) if $@;
 724         if ($user =~ m!^https?://! &&
 725             eval q{use Net::OpenID::VerifiedIdentity; 1} && !$@) {
 726                 # Munge user-urls, as used by eg, OpenID.
 727                 my $oid=Net::OpenID::VerifiedIdentity->new(identity => $user);
 728                 my $display=$oid->display;
 729                 # Convert "user.somehost.com" to "user [somehost.com]".
 730                 if ($display !~ /\[/) {
 731                         $display=~s/^(.*?)\.([^.]+\.[a-z]+)$/$1 [$2]/;
 732                 }
 733                 # Convert "http://somehost.com/user" to "user [somehost.com]".
 734                 if ($display !~ /\[/) {
 735                         $display=~s/^https?:\/\/(.+)\/([^\/]+)$/$2 [$1]/;
 736                 }
 737                 $display=~s!^https?://!!; # make sure this is removed
 738                 return "<a href=\"$user\">".escapeHTML($display)."</a>";
 739         }
 740         else {
 741                 return htmllink("", "", escapeHTML(
 742                         length $config{userdir} ? $config{userdir}."/".$user : $user
 743                 ), noimageinline => 1);
 744         }
 745 } #}}}
 746
 747 1