loncom/auth/lonauth.pm - view

File: [LON-CAPA] / loncom / auth / lonauth.pm
Revision 1.128: download - view: text, annotated - select for diffs
Tue Nov 26 01:19:12 2013 UTC (10 years, 5 months ago) by raeburn
Branches: MAIN
CVS tags: HEAD

- generate xhtml that satisifies w3c validation in cases where log-in failed.
- loncommon::font_settings() takes an optional argument -- a reference to a HASH
  from which browser support for unicode and mathml can be extracted, in case
  where user is unauthenticated.

1: # The LearningOnline Network 2: # User Authentication Module 3: # 4: # $Id: lonauth.pm,v 1.128 2013/11/26 01:19:12 raeburn Exp $ 5: # 6: # Copyright Michigan State University Board of Trustees 7: # 8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA). 9: # 10: # LON-CAPA is free software; you can redistribute it and/or modify 11: # it under the terms of the GNU General Public License as published by 12: # the Free Software Foundation; either version 2 of the License, or 13: # (at your option) any later version. 14: # 15: # LON-CAPA is distributed in the hope that it will be useful, 16: # but WITHOUT ANY WARRANTY; without even the implied warranty of 17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18: # GNU General Public License for more details. 19: # 20: # You should have received a copy of the GNU General Public License 21: # along with LON-CAPA; if not, write to the Free Software 22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23: # 24: # /home/httpd/html/adm/gpl.txt 25: # 26: # http://www.lon-capa.org/ 27: # 28: 29: package Apache::lonauth; 30: 31: use strict; 32: use LONCAPA; 33: use Apache::Constants qw(:common); 34: use CGI qw(:standard); 35: use DynaLoader; # for Crypt::DES version 36: use Crypt::DES; 37: use Apache::loncommon(); 38: use Apache::lonnet; 39: use Apache::lonmenu(); 40: use Apache::createaccount; 41: use Fcntl qw(:flock); 42: use Apache::lonlocal; 43: use Apache::File(); 44: use HTML::Entities; 45: 46: # ------------------------------------------------------------ Successful login 47: sub success { 48: my ($r, $username, $domain, $authhost, $lowerurl, $extra_env, 49: $form) = @_; 50: 51: # ------------------------------------------------------------ Get cookie ready 52: my $cookie = 53: &Apache::loncommon::init_user_environment($r, $username, $domain, 54: $authhost, $form, 55: {'extra_env' => $extra_env,}); 56: 57: my $public=($username eq 'public' && $domain eq 'public'); 58: 59: if ($public or $lowerurl eq 'noredirect') { return $cookie; } 60: 61: # -------------------------------------------------------------------- Log this 62: 63: &Apache::lonnet::log($domain,$username,$authhost, 64: "Login $ENV{'REMOTE_ADDR'}"); 65: 66: # ------------------------------------------------- Check for critical messages 67: 68: my @what=&Apache::lonnet::dump('critical',$domain,$username); 69: if ($what[0]) { 70: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) { 71: $lowerurl='/adm/email?critical=display'; 72: } 73: } 74: 75: # ------------------------------------------------------------ Get cookie ready 76: $cookie="lonID=$cookie; path=/"; 77: # -------------------------------------------------------- Menu script and info 78: my $destination = $lowerurl; 79: 80: if (defined($form->{role})) { 81: my $envkey = 'user.role.'.$form->{role}; 82: my $now=time; 83: my $then=$env{'user.login.time'}; 84: my $refresh=$env{'user.refresh.time'}; 85: my $update=$env{'user.update.time'}; 86: if (!$update) { 87: $update = $then; 88: } 89: if (exists($env{$envkey})) { 90: my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus); 91: &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where, 92: \$trolecode,\$tstatus,\$tstart,\$tend); 93: if ($tstatus eq 'is') { 94: $destination .= ($destination =~ /\?/) ? '&' : '?'; 95: my $newrole = &HTML::Entities::encode($form->{role},'"<>&'); 96: $destination .= 'selectrole=1&'.$newrole.'=1'; 97: } 98: } 99: } 100: if (defined($form->{symb})) { 101: my $destsymb = $form->{symb}; 102: $destination .= ($destination =~ /\?/) ? '&' : '?'; 103: if ($destsymb =~ /___/) { 104: # FIXME Need to deal with encrypted symbs and urls as needed. 105: my ($map,$resid,$desturl)=split(/___/,$destsymb); 106: unless ($desturl=~/^(adm|editupload|public)/) { 107: $desturl = &Apache::lonnet::clutter($desturl); 108: } 109: $desturl = &HTML::Entities::encode($desturl,'"<>&'); 110: $destsymb = &HTML::Entities::encode($destsymb,'"<>&'); 111: $destination .= '&destinationurl='.$desturl. 112: '&destsymb='.$destsymb; 113: } else { 114: $destsymb = &HTML::Entities::encode($destsymb,'"<>&'); 115: $destination .= '&destinationurl='.$destsymb; 116: } 117: } 118: if ($destination =~ m{^/adm/roles}) { 119: $destination .= ($destination =~ /\?/) ? '&' : '?'; 120: $destination .= 'source=login'; 121: } 122: 123: my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";'); 124: my $header = '<meta HTTP-EQUIV="Refresh" CONTENT="0; url='.$destination.'" />'; 125: my $brcrum = [{'href' => '', 126: 'text' => 'Successful Login'},]; 127: my $start_page=&Apache::loncommon::start_page('Successful Login', 128: $header, 129: {'bread_crumbs' => $brcrum,}); 130: my $end_page =&Apache::loncommon::end_page(); 131: 132: my $continuelink='<a href="'.$destination.'">'.&mt('Continue').'</a>'; 133: # ------------------------------------------------- Output for successful login 134: 135: &Apache::loncommon::content_type($r,'text/html'); 136: $r->header_out('Set-cookie' => $cookie); 137: $r->send_http_header; 138: 139: my %lt=&Apache::lonlocal::texthash( 140: 'wel' => 'Welcome', 141: 'pro' => 'Login problems?', 142: ); 143: my $loginhelp = &loginhelpdisplay($domain); 144: if ($loginhelp) { 145: $loginhelp = '<p><a href="'.$loginhelp.'">'.$lt{'pro'}.'</a></p>'; 146: } 147: 148: my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','<i>','</i>'); 149: $r->print(<<ENDSUCCESS); 150: $start_page 151: $windowinfo 152: <h1>$lt{'wel'}</h1> 153: $welcome 154: $loginhelp 155: $continuelink 156: $end_page 157: ENDSUCCESS 158: } 159: 160: # --------------------------------------------------------------- Failed login! 161: 162: sub failed { 163: my ($r,$message,$form) = @_; 164: (undef,undef,undef,my $clientmathml,my $clientunicode) = 165: &Apache::loncommon::decode_user_agent(); 166: my $args = {}; 167: if ($clientunicode && !$clientmathml) { 168: $args = {'browser.unicode' => 1}; 169: } 170: 171: my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args); 172: my $uname = $form->{'uname'}; 173: my $udom; 174: if (&Apache::lonnet::domain($form->{'udom'},'description') ne '') { 175: $udom = $form->{'udom'}; 176: } 177: my $retry = '/adm/login?username='.$form->{'uname'}; 178: if ($udom) { 179: $retry .= '&domain='.$form->{'udom'} 180: } 181: if (exists($form->{role})) { 182: $retry .= '&role='.$form->{role}; 183: } 184: if (exists($form->{symb})) { 185: $retry .= '&symb='.$form->{symb}; 186: } 187: my $end_page = &Apache::loncommon::end_page(); 188: &Apache::loncommon::content_type($r,'text/html'); 189: $r->send_http_header; 190: my $loginhelp = &loginhelpdisplay($udom); 191: if ($loginhelp) { 192: $loginhelp = '<p><a href="'.$loginhelp.'">'.&mt('Login problems?').'</a></p>'; 193: } 194: 195: $r->print( 196: $start_page 197: .'<h1>'.&mt('Sorry ...').'</h1>' 198: .'<p class="LC_warning">'.&mt($message).'</p>' 199: .'<p>'.&mt('Please [_1]log in again[_2].','<a href="'.$retry.'">','</a>') 200: .'</p>' 201: .$loginhelp 202: .$end_page 203: ); 204: } 205: 206: # ------------------------------------------------------------------ Rerouting! 207: 208: sub reroute { 209: my ($r) = @_; 210: &Apache::loncommon::content_type($r,'text/html'); 211: $r->send_http_header; 212: my $msg='<b>'.&mt('Sorry ...').'</b><br />' 213: .&mt('Please [_1]log in again[_2].'); 214: &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1}); 215: } 216: 217: # ---------------------------------------------------------------- Main handler 218: 219: sub handler { 220: my $r = shift; 221: my $londocroot = $r->dir_config('lonDocRoot'); 222: my $form; 223: # Are we re-routing? 224: if (-e "$londocroot/lon-status/reroute.txt") { 225: &reroute($r); 226: return OK; 227: } 228: 229: &Apache::lonlocal::get_language_handle($r); 230: 231: # -------------------------------- Prevent users from attempting to login twice 232: my $handle = &Apache::lonnet::check_for_valid_session($r); 233: if ($handle ne '') { 234: my $lonidsdir=$r->dir_config('lonIDsDir'); 235: if ($handle=~/^publicuser\_/) { 236: # For "public user" - remove it, we apparently really want to login 237: unlink($r->dir_config('lonIDsDir')."/$handle.id"); 238: } else { 239: # Indeed, a valid token is found 240: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle); 241: &Apache::loncommon::content_type($r,'text/html'); 242: $r->send_http_header; 243: my $start_page = 244: &Apache::loncommon::start_page('Already logged in'); 245: my $end_page = 246: &Apache::loncommon::end_page(); 247: my $dest = '/adm/roles'; 248: if ($env{'form.firsturl'} ne '') { 249: $dest = $env{'form.firsturl'}; 250: } 251: $r->print( 252: $start_page 253: .'<p class="LC_warning">'.&mt('You are already logged in!').'</p>' 254: .'<p>'.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].' 255: ,'<a href="'.$dest.'">','</a>','<a href="/adm/logout">','</a>') 256: .'</p>' 257: .$end_page 258: ); 259: return OK; 260: } 261: } 262: 263: # ---------------------------------------------------- No valid token, continue 264: 265: 266: my $buffer; 267: if ($r->header_in('Content-length') > 0) { 268: $r->read($buffer,$r->header_in('Content-length'),0); 269: } 270: my %form; 271: foreach my $pair (split(/&/,$buffer)) { 272: my ($name,$value) = split(/=/,$pair); 273: $value =~ tr/+/ /; 274: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; 275: $form{$name}=$value; 276: } 277: 278: if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) { 279: &failed($r,'Username, password and domain need to be specified.', 280: \%form); 281: return OK; 282: } 283: 284: # split user logging in and "su"-user 285: 286: ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'}); 287: $form{'uname'} = &LONCAPA::clean_username($form{'uname'}); 288: $form{'suname'}= &LONCAPA::clean_username($form{'suname'}); 289: $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'}); 290: 291: my $role = $r->dir_config('lonRole'); 292: my $domain = $r->dir_config('lonDefDomain'); 293: my $prodir = $r->dir_config('lonUsersDir'); 294: my $contact_name = &mt('LON-CAPA helpdesk'); 295: 296: # ---------------------------------------- Get the information from login token 297: 298: my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'}, 299: $form{'serverid'}); 300: 301: my %sessiondata; 302: if ($form{'iptoken'}) { 303: %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'}); 304: my $delete = &Apache::lonnet::tmpdel($form{'token'}); 305: } 306: 307: if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') || 308: ($tmpinfo eq 'no_such_host')) { 309: &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form); 310: return OK; 311: } else { 312: my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'}, 313: $form{'serverid'}); 314: if ( $reply ne 'ok' ) { 315: &failed($r,'Session could not be opened.',\%form); 316: &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token"); 317: return OK; 318: } 319: } 320: 321: if (!&Apache::lonnet::domain($form{'udom'})) { 322: &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form); 323: return OK; 324: } 325: 326: my ($key,$firsturl,$rolestr,$symbstr)=split(/&/,$tmpinfo); 327: if ($rolestr) { 328: $rolestr = &unescape($rolestr); 329: } 330: if ($symbstr) { 331: $symbstr= &unescape($symbstr); 332: } 333: if ($rolestr =~ /^role=/) { 334: (undef,$form{'role'}) = split('=',$rolestr); 335: } 336: if ($symbstr =~ /^symb=/) { 337: (undef,$form{'symb'}) = split('=',$symbstr); 338: } 339: 340: my $keybin=pack("H16",$key); 341: 342: my $cipher; 343: if ($Crypt::DES::VERSION>=2.03) { 344: $cipher=new Crypt::DES $keybin; 345: } 346: else { 347: $cipher=new DES $keybin; 348: } 349: my $upass=''; 350: for (my $i=0;$i<=2;$i++) { 351: my $chunk= 352: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},0,16)))); 353: 354: $chunk.= 355: $cipher->decrypt(unpack("a8",pack("H16",substr($form{'upass'.$i},16,16)))); 356: 357: $chunk=substr($chunk,1,ord(substr($chunk,0,1))); 358: $upass.=$chunk; 359: } 360: 361: # ---------------------------------------------------------------- Authenticate 362: 363: my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'}); 364: my ($cancreate,$statustocreate) = 365: &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'}); 366: my $defaultauth; 367: if (ref($cancreate) eq 'ARRAY') { 368: if (grep(/^login$/,@{$cancreate})) { 369: $defaultauth = 1; 370: } 371: } 372: my $clientcancheckhost = 1; 373: my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass, 374: $form{'udom'},$defaultauth, 375: $clientcancheckhost); 376: 377: # --------------------------------------------------------------------- Failed? 378: 379: if ($authhost eq 'no_host') { 380: &failed($r,'Username and/or password could not be authenticated.', 381: \%form); 382: return OK; 383: } elsif ($authhost eq 'no_account_on_host') { 384: if ($defaultauth) { 385: my $domdesc = &Apache::lonnet::domain($form{'udom'},'description'); 386: unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) { 387: return OK; 388: } 389: my $start_page = 390: &Apache::loncommon::start_page('Create a user account in LON-CAPA'); 391: my $lonhost = $r->dir_config('lonHostID'); 392: my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'}; 393: my $contacts = 394: &Apache::loncommon::build_recipient_list(undef,'helpdeskmail', 395: $form{'udom'},$origmail); 396: my ($contact_email) = split(',',$contacts); 397: my $output = 398: &Apache::createaccount::username_check($form{'uname'},$form{'udom'}, 399: $domdesc,'',$lonhost, 400: $contact_email,$contact_name, 401: undef,$statustocreate); 402: &Apache::loncommon::content_type($r,'text/html'); 403: $r->send_http_header; 404: &Apache::createaccount::print_header($r,$start_page); 405: $r->print('<h3>'.&mt('Account creation').'</h3>'. 406: &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'<br />'. 407: $output.&Apache::loncommon::end_page()); 408: return OK; 409: } else { 410: &failed($r,'Although your username and password were authenticated, you do not currently have a LON-CAPA account in this domain, and you are not permitted to create one.',\%form); 411: return OK; 412: } 413: } 414: 415: if (($firsturl eq '') || 416: ($firsturl=~/^\/adm\/(logout|remote)/)) { 417: $firsturl='/adm/roles'; 418: } 419: 420: my $hosthere; 421: if ($form{'iptoken'}) { 422: if (($sessiondata{'domain'} eq $form{'udom'}) && 423: ($sessiondata{'username'} eq $form{'uname'})) { 424: $hosthere = 1; 425: } 426: } 427: 428: # --------------------------------- Are we attempting to login as somebody else? 429: if ($form{'suname'}) { 430: # ------------ see if the original user has enough privileges to pull this stunt 431: if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) { 432: # ---------------------------------------------------- see if the su-user exists 433: unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}) 434: eq 'no_host') { 435: &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})); 436: # ------------------------------ see if the su-user is not too highly privileged 437: unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) { 438: # -------------------------------------------------------- actually switch users 439: &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}. 440: ' logging in as '.$form{'suname'}); 441: $form{'uname'}=$form{'suname'}; 442: } else { 443: &Apache::lonnet::logthis('Attempted switch user to privileged user'); 444: } 445: } 446: } else { 447: &Apache::lonnet::logthis('Non-privileged user attempting switch user'); 448: } 449: } 450: 451: my ($is_balancer,$otherserver); 452: 453: unless ($hosthere) { 454: ($is_balancer,$otherserver) = 455: &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'}); 456: } 457: 458: if ($is_balancer) { 459: if (!$otherserver) { 460: ($otherserver) = &Apache::lonnet::choose_server($form{'udom'}); 461: } 462: if ($otherserver) { 463: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef, 464: \%form); 465: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl); 466: } else { 467: $r->print(&noswitch()); 468: } 469: return OK; 470: } else { 471: if (!&check_can_host($r,\%form,$authhost)) { 472: my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'}); 473: if ($otherserver) { 474: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef, 475: \%form); 476: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver.'&origurl='.$firsturl); 477: } else { 478: $r->print(&noswitch()); 479: } 480: return OK; 481: } 482: 483: # ------------------------------------------------------- Do the load balancing 484: 485: # ---------------------------------------------------------- Determine own load 486: my $loadlim = $r->dir_config('lonLoadLim'); 487: my $loadavg; 488: { 489: my $loadfile=Apache::File->new('/proc/loadavg'); 490: $loadavg=<$loadfile>; 491: } 492: $loadavg =~ s/\s.*//g; 493: my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim); 494: my $userloadpercent=&Apache::lonnet::userload(); 495: 496: # ---------------------------------------------------------- Are we overloaded? 497: if ((($userloadpercent>100.0)||($loadpercent>100.0))) { 498: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'}); 499: if (!$unloaded) { 500: ($unloaded) = &Apache::lonnet::choose_server($form{'udom'}); 501: } 502: if ($unloaded) { 503: &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect', 504: undef,\%form); 505: $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl); 506: return OK; 507: } 508: } 509: &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef, 510: \%form); 511: return OK; 512: } 513: } 514: 515: sub check_can_host { 516: my ($r,$form,$authhost,$domdesc) = @_; 517: return unless (ref($form) eq 'HASH'); 518: my $canhost = 1; 519: my $lonhost = $r->dir_config('lonHostID'); 520: my $udom = $form->{'udom'}; 521: my @intdoms; 522: my $internet_names = &Apache::lonnet::get_internet_names($lonhost); 523: if (ref($internet_names) eq 'ARRAY') { 524: @intdoms = @{$internet_names}; 525: } 526: my $uprimary_id = &Apache::lonnet::domain($udom,'primary'); 527: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id); 528: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) { 529: my $machine_dom = &Apache::lonnet::host_domain($lonhost); 530: my $hostname = &Apache::lonnet::hostname($lonhost); 531: my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname); 532: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID); 533: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom); 534: my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom); 535: my $loncaparev; 536: if ($authhost eq 'no_account_on_host') { 537: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom); 538: } else { 539: $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost); 540: } 541: $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev, 542: $udomdefaults{'remotesessions'}, 543: $defdomdefaults{'hostedsessions'}); 544: } 545: unless ($canhost) { 546: if ($authhost eq 'no_account_on_host') { 547: my $checkloginvia = 1; 548: my ($login_host,$hostname) = 549: &Apache::lonnet::choose_server($udom,$checkloginvia); 550: &Apache::loncommon::content_type($r,'text/html'); 551: $r->send_http_header; 552: if ($login_host ne '') { 553: my $protocol = $Apache::lonnet::protocol{$login_host}; 554: $protocol = 'http' if ($protocol ne 'https'); 555: my $newurl = $protocol.'://'.$hostname.'/adm/createaccount'; 556: $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA'). 557: '<h3>'.&mt('Account creation').'</h3>'. 558: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'. 559: '<p>'.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'</p>'. 560: '<p>'.&mt('[_1]Log in[_2]','<a href="'.$newurl.'">','</a>'). 561: &Apache::loncommon::end_page()); 562: } else { 563: $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable'). 564: '<h3>'.&mt('Account creation unavailable').'</h3>'. 565: &mt('You do not currently have a LON-CAPA account at this institution.').'<br />'. 566: '<p>'.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'</p>'. 567: &Apache::loncommon::end_page()); 568: } 569: } else { 570: &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef, 571: $form); 572: my ($otherserver) = &Apache::lonnet::choose_server($udom); 573: $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver); 574: } 575: } 576: return $canhost; 577: } 578: 579: sub noswitch { 580: my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable'). 581: '<h3>'.&mt('Session unavailable').'</h3>'. 582: &mt('This LON-CAPA server is unable to host your session.').'<br />'. 583: '<p>'.&mt('Currently no other LON-CAPA server is available to host your session either.').'</p>'. 584: &Apache::loncommon::end_page(); 585: return $result; 586: } 587: 588: sub loginhelpdisplay { 589: my ($authdomain) = @_; 590: my $login_help = 1; 591: my $lang = &Apache::lonlocal::current_language(); 592: if ($login_help) { 593: my $dom = $authdomain; 594: if ($dom eq '') { 595: $dom = &Apache::lonnet::default_login_domain(); 596: } 597: my %domconfhash = &Apache::loncommon::get_domainconf($dom); 598: my $loginhelp_url; 599: if ($lang) { 600: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang}; 601: if ($loginhelp_url ne '') { 602: return $loginhelp_url; 603: } 604: } 605: $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'}; 606: if ($loginhelp_url ne '') { 607: return $loginhelp_url; 608: } else { 609: return '/adm/loginproblems.html'; 610: } 611: } 612: return; 613: } 614: 615: 1; 616: __END__ 617: 618: