IkiWiki/CGI.pm

   1 #!/usr/bin/perl
   2
   3 package IkiWiki;
   4
   5 use warnings;
   6 use strict;
   7 use IkiWiki;
   8 use IkiWiki::UserInfo;
   9 use open qw{:utf8 :std};
  10 use Encode;
  11
  12 sub printheader ($) {
  13         my $session=shift;
  14
  15         if ($config{sslcookie}) {
  16                 print $session->header(-charset => 'utf-8',
  17                         -cookie => $session->cookie(-httponly => 1, -secure => 1));
  18         } else {
  19                 print $session->header(-charset => 'utf-8',
  20                         -cookie => $session->cookie(-httponly => 1));
  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 $url\n\n";
  50         }
  51 }
  52
  53 sub decode_cgi_utf8 ($) {
  54         # decode_form_utf8 method is needed for 5.10
  55         if ($] < 5.01) {
  56                 my $cgi = shift;
  57                 foreach my $f ($cgi->param) {
  58                         $cgi->param($f, map { decode_utf8 $_ } $cgi->param($f));
  59                 }
  60         }
  61 }
  62
  63 sub decode_form_utf8 ($) {
  64         if ($] >= 5.01) {
  65                 my $form = shift;
  66                 foreach my $f ($form->field) {
  67                         $form->field(name  => $f,
  68                                      value => decode_utf8($form->field($f)),
  69                                      force => 1,
  70                         );
  71                 }
  72         }
  73 }
  74
  75 # Check if the user is signed in. If not, redirect to the signin form and
  76 # save their place to return to later.
  77 sub needsignin ($$) {
  78         my $q=shift;
  79         my $session=shift;
  80
  81         if (! defined $session->param("name") ||
  82             ! userinfo_get($session->param("name"), "regdate")) {
  83                 $session->param(postsignin => $ENV{QUERY_STRING});
  84                 cgi_signin($q, $session);
  85                 cgi_savesession($session);
  86                 exit;
  87         }
  88 }
  89
  90 sub cgi_signin ($$) {
  91         my $q=shift;
  92         my $session=shift;
  93
  94         decode_cgi_utf8($q);
  95         eval q{use CGI::FormBuilder};
  96         error($@) if $@;
  97         my $form = CGI::FormBuilder->new(
  98                 title => "signin",
  99                 name => "signin",
 100                 charset => "utf-8",
 101                 method => 'POST',
 102                 required => 'NONE',
 103                 javascript => 0,
 104                 params => $q,
 105                 action => $config{cgiurl},
 106                 header => 0,
 107                 template => {type => 'div'},
 108                 stylesheet => baseurl()."style.css",
 109         );
 110         my $buttons=["Login"];
 111
 112         if ($q->param("do") ne "signin" && !$form->submitted) {
 113                 $form->text(gettext("You need to log in first."));
 114         }
 115         $form->field(name => "do", type => "hidden", value => "signin",
 116                 force => 1);
 117
 118         decode_form_utf8($form);
 119         run_hooks(formbuilder_setup => sub {
 120                 shift->(form => $form, cgi => $q, session => $session,
 121                         buttons => $buttons);
 122         });
 123         decode_form_utf8($form);
 124
 125         if ($form->submitted) {
 126                 $form->validate;
 127         }
 128
 129         showform($form, $buttons, $session, $q);
 130 }
 131
 132 sub cgi_postsignin ($$) {
 133         my $q=shift;
 134         my $session=shift;
 135
 136         # Continue with whatever was being done before the signin process.
 137         if (defined $session->param("postsignin")) {
 138                 my $postsignin=CGI->new($session->param("postsignin"));
 139                 $session->clear("postsignin");
 140                 cgi($postsignin, $session);
 141                 cgi_savesession($session);
 142                 exit;
 143         }
 144         else {
 145                 error(gettext("login failed, perhaps you need to turn on cookies?"));
 146         }
 147 }
 148
 149 sub cgi_prefs ($$) {
 150         my $q=shift;
 151         my $session=shift;
 152
 153         needsignin($q, $session);
 154         decode_cgi_utf8($q);
 155
 156         # The session id is stored on the form and checked to
 157         # guard against CSRF.
 158         my $sid=$q->param('sid');
 159         if (! defined $sid) {
 160                 $q->delete_all;
 161         }
 162         elsif ($sid ne $session->id) {
 163                 error(gettext("Your login session has expired."));
 164         }
 165
 166         eval q{use CGI::FormBuilder};
 167         error($@) if $@;
 168         my $form = CGI::FormBuilder->new(
 169                 title => "preferences",
 170                 name => "preferences",
 171                 header => 0,
 172                 charset => "utf-8",
 173                 method => 'POST',
 174                 validate => {
 175                         email => 'EMAIL',
 176                 },
 177                 required => 'NONE',
 178                 javascript => 0,
 179                 params => $q,
 180                 action => $config{cgiurl},
 181                 template => {type => 'div'},
 182                 stylesheet => baseurl()."style.css",
 183                 fieldsets => [
 184                         [login => gettext("Login")],
 185                         [preferences => gettext("Preferences")],
 186                         [admin => gettext("Admin")]
 187                 ],
 188         );
 189         my $buttons=["Save Preferences", "Logout", "Cancel"];
 190
 191         decode_form_utf8($form);
 192         run_hooks(formbuilder_setup => sub {
 193                 shift->(form => $form, cgi => $q, session => $session,
 194                         buttons => $buttons);
 195         });
 196         decode_form_utf8($form);
 197
 198         $form->field(name => "do", type => "hidden", value => "prefs",
 199                 force => 1);
 200         $form->field(name => "sid", type => "hidden", value => $session->id,
 201                 force => 1);
 202         $form->field(name => "email", size => 50, fieldset => "preferences");
 203
 204         my $user_name=$session->param("name");
 205
 206         if (! $form->submitted) {
 207                 $form->field(name => "email", force => 1,
 208                         value => userinfo_get($user_name, "email"));
 209         }
 210
 211         if ($form->submitted eq 'Logout') {
 212                 $session->delete();
 213                 redirect($q, $config{url});
 214                 return;
 215         }
 216         elsif ($form->submitted eq 'Cancel') {
 217                 redirect($q, $config{url});
 218                 return;
 219         }
 220         elsif ($form->submitted eq 'Save Preferences' && $form->validate) {
 221                 if (defined $form->field('email')) {
 222                         userinfo_set($user_name, 'email', $form->field('email')) ||
 223                                 error("failed to set email");
 224                 }
 225
 226                 $form->text(gettext("Preferences saved."));
 227         }
 228
 229         showform($form, $buttons, $session, $q);
 230 }
 231
 232 sub cgi_custom_failure ($$) {
 233         my $header=shift;
 234         my $message=shift;
 235
 236         print $header;
 237         print $message;
 238
 239         # Internet Explod^Hrer won't show custom 404 responses
 240         # unless they're >= 512 bytes
 241         print ' ' x 512;
 242
 243         exit;
 244 }
 245
 246 sub check_banned ($$) {
 247         my $q=shift;
 248         my $session=shift;
 249
 250         my $name=$session->param("name");
 251         if (defined $name) {
 252                 if (grep { $name eq $_ } @{$config{banned_users}}) {
 253                         $session->delete();
 254                         cgi_savesession($session);
 255                         cgi_custom_failure(
 256                                 $q->header(-status => "403 Forbidden"),
 257                                 gettext("You are banned."));
 258                 }
 259         }
 260 }
 261
 262 sub cgi_getsession ($) {
 263         my $q=shift;
 264
 265         eval q{use CGI::Session; use HTML::Entities};
 266         error($@) if $@;
 267         CGI::Session->name("ikiwiki_session_".encode_entities($config{wikiname}));
 268
 269         my $oldmask=umask(077);
 270         my $session = eval {
 271                 CGI::Session->new("driver:DB_File", $q,
 272                         { FileName => "$config{wikistatedir}/sessions.db" })
 273         };
 274         if (! $session || $@) {
 275                 error($@." ".CGI::Session->errstr());
 276         }
 277
 278         umask($oldmask);
 279
 280         return $session;
 281 }
 282
 283 # To guard against CSRF, the user's session id (sid)
 284 # can be stored on a form. This function will check
 285 # (for logged in users) that the sid on the form matches
 286 # the session id in the cookie.
 287 sub checksessionexpiry ($$) {
 288         my $q=shift;
 289         my $session = shift;
 290
 291         if (defined $session->param("name")) {
 292                 my $sid=$q->param('sid');
 293                 if (! defined $sid || $sid ne $session->id) {
 294                         error(gettext("Your login session has expired."));
 295                 }
 296         }
 297 }
 298
 299 sub cgi_savesession ($) {
 300         my $session=shift;
 301
 302         # Force session flush with safe umask.
 303         my $oldmask=umask(077);
 304         $session->flush;
 305         umask($oldmask);
 306 }
 307
 308 sub cgi (;$$) {
 309         my $q=shift;
 310         my $session=shift;
 311
 312         eval q{use CGI};
 313         error($@) if $@;
 314         $CGI::DISABLE_UPLOADS=$config{cgi_disable_uploads};
 315
 316         if (! $q) {
 317                 binmode(STDIN);
 318                 $q=CGI->new;
 319                 binmode(STDIN, ":utf8");
 320
 321                 run_hooks(cgi => sub { shift->($q) });
 322         }
 323
 324         my $do=$q->param('do');
 325         if (! defined $do || ! length $do) {
 326                 my $error = $q->cgi_error;
 327                 if ($error) {
 328                         error("Request not processed: $error");
 329                 }
 330                 else {
 331                         error("\"do\" parameter missing");
 332                 }
 333         }
 334
 335         # Need to lock the wiki before getting a session.
 336         lockwiki();
 337         loadindex();
 338
 339         if (! $session) {
 340                 $session=cgi_getsession($q);
 341         }
 342
 343         # Auth hooks can sign a user in.
 344         if ($do ne 'signin' && ! defined $session->param("name")) {
 345                 run_hooks(auth => sub {
 346                         shift->($q, $session)
 347                 });
 348                 if (defined $session->param("name")) {
 349                         # Make sure whatever user was authed is in the
 350                         # userinfo db.
 351                         if (! userinfo_get($session->param("name"), "regdate")) {
 352                                 userinfo_setall($session->param("name"), {
 353                                         email => "",
 354                                         password => "",
 355                                         regdate => time,
 356                                 }) || error("failed adding user");
 357                         }
 358                 }
 359         }
 360
 361         check_banned($q, $session);
 362
 363         run_hooks(sessioncgi => sub { shift->($q, $session) });
 364
 365         if ($do eq 'signin') {
 366                 cgi_signin($q, $session);
 367                 cgi_savesession($session);
 368         }
 369         elsif ($do eq 'prefs') {
 370                 cgi_prefs($q, $session);
 371         }
 372         elsif (defined $session->param("postsignin") || $do eq 'postsignin') {
 373                 cgi_postsignin($q, $session);
 374         }
 375         else {
 376                 error("unknown do parameter");
 377         }
 378 }
 379
 380 # Does not need to be called directly; all errors will go through here.
 381 sub cgierror ($) {
 382         my $message=shift;
 383
 384         print "Content-type: text/html\n\n";
 385         print misctemplate(gettext("Error"),
 386                 "<p class=\"error\">".gettext("Error").": $message</p>");
 387         die $@;
 388 }
 389
 390 1