$lt{'wel'}
-$welcome
-$loginhelp
-$remoteinfo
-$maincall
-$continuelink
-$end_page
-ENDSUCCESS
- return;
-}
-
-# --------------------------------------------------------------- Failed login!
-
-sub failed {
- my ($r,$message,$form,$authhost) = @_;
- (undef,undef,undef,my $clientmathml,my $clientunicode) =
- &Apache::loncommon::decode_user_agent();
- my $args = {};
- if ($clientunicode && !$clientmathml) {
- $args = {'browser.unicode' => 1};
- }
-
- my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
- my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
- my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
- if (&Apache::lonnet::domain($udom,'description') eq '') {
- undef($udom);
- }
- my $retry = '/adm/login';
- if ($uname eq $form->{'uname'}) {
- $retry .= '?username='.$uname;
- }
- if ($udom) {
- $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
- }
- my $lonhost = $r->dir_config('lonHostID');
- my $querystr;
- my $result = &set_retry_token($form,$lonhost,\$querystr);
- if ($result eq 'fail') {
- if (exists($form->{role})) {
- my $role = &Apache::loncommon::cleanup_html($form->{role});
- if ($role ne '') {
- $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
- }
- }
- if (exists($form->{symb})) {
- my $symb = &Apache::loncommon::cleanup_html($form->{symb});
- if ($symb ne '') {
- $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
- }
- }
- if (exists($form->{firsturl})) {
- my $firsturl = &Apache::loncommon::cleanup_html($form->{firsturl});
- if ($firsturl ne '') {
- $retry .= (($retry=~/\?/)?'&':'?').'firsturl='.$firsturl;
- }
- }
- } elsif ($querystr ne '') {
- $retry .= (($retry=~/\?/)?'&':'?').$querystr;
- }
- my $end_page = &Apache::loncommon::end_page();
- &Apache::loncommon::content_type($r,'text/html');
- $r->send_http_header;
- my @actions =
- (&mt('Please [_1]log in again[_2].','',''));
- my $loginhelp = &loginhelpdisplay($udom);
- if ($loginhelp) {
- push(@actions, ''.&mt('Login problems?').'');
- }
- #FIXME: link to helpdesk might be added here
-
- $r->print(
- $start_page
- .''.&mt('Sorry ...').'
'
- .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'
'
- .&Apache::lonhtmlcommon::actionbox(\@actions)
- .$end_page
- );
- }
-
-# ------------------------------------------------------------------ Rerouting!
-
-sub reroute {
- my ($r) = @_;
- &Apache::loncommon::content_type($r,'text/html');
- $r->send_http_header;
- my $msg=''.&mt('Sorry ...').'
'
- .&mt('Please [_1]log in again[_2].');
- &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
-}
-
-# ---------------------------------------------------------------- Main handler
-
-sub handler {
- my $r = shift;
- my $londocroot = $r->dir_config('lonDocRoot');
-# Are we re-routing?
- if (-e "$londocroot/lon-status/reroute.txt") {
- &reroute($r);
- return OK;
- }
-
- &Apache::lonlocal::get_language_handle($r);
-
-# -------------------------------- Prevent users from attempting to login twice
- my $handle = &Apache::lonnet::check_for_valid_session($r);
- if ($handle ne '') {
- my $lonidsdir=$r->dir_config('lonIDsDir');
- if ($handle=~/^publicuser\_/) {
-# For "public user" - remove it, we apparently really want to login
- unlink($r->dir_config('lonIDsDir')."/$handle.id");
- } else {
-# Indeed, a valid token is found
- &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
- &Apache::loncommon::content_type($r,'text/html');
- $r->send_http_header;
- my $start_page =
- &Apache::loncommon::start_page('Already logged in');
- my $end_page =
- &Apache::loncommon::end_page();
- my $dest = '/adm/roles';
- my %form = &get_form_items($r);
- if ($form{'logtoken'}) {
- my $tmpinfo = &Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
- $form{'serverid'});
- unless (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
- ($tmpinfo eq 'no_such_host')) {
- my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
- $firsturl = &unescape($firsturl);
- my %info;
- foreach my $item (@rest) {
- my ($key,$value) = split(/=/,$item);
- $info{$key} = &unescape($value);
- }
- if ($firsturl ne '') {
- $info{'firsturl'} = $firsturl;
- $dest = $firsturl;
- }
- }
- }
- $r->print(
- $start_page
- .''.&mt('You are already logged in!').'
'
- .''.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
- ,'','','','')
- .'
'
- .$end_page
- );
- return OK;
- }
- }
-
-# ---------------------------------------------------- No valid token, continue
-
- my %form = &get_form_items($r);
- if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
- &failed($r,'Username, password and domain need to be specified.',
- \%form);
- return OK;
- }
-
-# split user logging in and "su"-user
-
- ($form{'uname'},$form{'suname'},$form{'sudom'})=split(/\:/,$form{'uname'});
- $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
- $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
- $form{'udom'} = &LONCAPA::clean_domain($form{'udom'});
- $form{'sudom'} = &LONCAPA::clean_domain($form{'sudom'});
-
- my $role = $r->dir_config('lonRole');
- my $domain = $r->dir_config('lonDefDomain');
- my $prodir = $r->dir_config('lonUsersDir');
- my $contact_name = &mt('LON-CAPA helpdesk');
-
-# ---------------------------------------- Get the information from login token
-
- my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
- $form{'serverid'});
-
- if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
- ($tmpinfo eq 'no_such_host')) {
- &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
- return OK;
- } else {
- my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
- $form{'serverid'});
- if ( $reply ne 'ok' ) {
- &failed($r,'Session could not be opened.',\%form);
- &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
- return OK;
- }
- }
-
- if (!&Apache::lonnet::domain($form{'udom'})) {
- &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
- return OK;
- }
-
- my ($des_key,$firsturl,@rest)=split(/&/,$tmpinfo);
- $firsturl = &unescape($firsturl);
- foreach my $item (@rest) {
- my ($key,$value) = split(/=/,$item);
- $form{$key} = &unescape($value);
- }
- my $upass = &Apache::loncommon::des_decrypt($des_key,$form{'upass0'});
-
-# ---------------------------------------------------------------- Authenticate
-
- my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
- my ($cancreate,$statustocreate) =
- &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
- my $defaultauth;
- if (ref($cancreate) eq 'ARRAY') {
- if (grep(/^login$/,@{$cancreate})) {
- $defaultauth = 1;
- }
- }
- my $clientcancheckhost = 1;
- my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
- $form{'udom'},$defaultauth,
- $clientcancheckhost);
-
-# --------------------------------------------------------------------- Failed?
-
- if ($authhost eq 'no_host') {
- my $pwdverify;
- if (&Apache::lonnet::homeserver($form{'uname'},$form{'udom'}) eq 'no_host') {
- my %possunames = &alternate_unames_check($form{'uname'},$form{'udom'});
- if (keys(%possunames) > 0) {
- foreach my $rulematch (keys(%possunames)) {
- my $possuname = $possunames{$rulematch};
- if (($possuname ne '') && ($possuname =~ /^$match_username$/)) {
- $authhost=Apache::lonnet::authenticate($possuname,$upass,
- $form{'udom'},undef,
- $clientcancheckhost);
- if (($authhost eq 'no_host') || ($authhost eq 'no_account_on_host')) {
- next;
- } elsif (($authhost ne '') && (&Apache::lonnet::hostname($authhost) ne '')) {
- $pwdverify = 1;
- &Apache::lonnet::logthis("Authenticated user: $possuname was submitted as: $form{'uname'}");
- $form{'uname'} = $possuname;
- last;
- }
- }
- }
- }
- }
- unless ($pwdverify) {
- &failed($r,'Username and/or password could not be authenticated.',
- \%form);
- return OK;
- }
- } elsif ($authhost eq 'no_account_on_host') {
- if ($defaultauth) {
- my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
- unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
- return OK;
- }
- my $start_page =
- &Apache::loncommon::start_page('Create a user account in LON-CAPA',
- '',{'no_inline_link' => 1,});
- my $lonhost = $r->dir_config('lonHostID');
- my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
- my $contacts =
- &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
- $form{'udom'},$origmail);
- my ($contact_email) = split(',',$contacts);
- my $output =
- &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
- $domdesc,'',$lonhost,
- $contact_email,$contact_name,
- undef,$statustocreate);
- &Apache::loncommon::content_type($r,'text/html');
- $r->send_http_header;
- &Apache::createaccount::print_header($r,$start_page);
- $r->print(''.&mt('Account creation').'
'.
- &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'
'.
- $output.&Apache::loncommon::end_page());
- return OK;
- } else {
- &failed($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);
- return OK;
- }
- }
-
- if (($firsturl eq '') ||
- ($firsturl=~/^\/adm\/(logout|remote)/)) {
- $firsturl='/adm/roles';
- }
-
- my ($hosthere,%sessiondata);
- if ($form{'iptoken'}) {
- %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
- my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
- if (($sessiondata{'domain'} eq $form{'udom'}) &&
- ($sessiondata{'username'} eq $form{'uname'})) {
- $hosthere = 1;
- }
- }
-
-# --------------------------------- Are we attempting to login as somebody else?
- if ($form{'suname'}) {
- my ($suname,$sudom,$sudomref);
- $suname = $form{'suname'};
- $sudom = $form{'udom'};
- if ($form{'sudom'}) {
- unless ($sudom eq $form{'sudom'}) {
- if (&Apache::lonnet::domain($form{'sudom'})) {
- $sudomref = [$form{'sudom'}];
- $sudom = $form{'sudom'};
- }
- }
- }
-# ------------ see if the original user has enough privileges to pull this stunt
- if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'},$sudomref)) {
-# ---------------------------------------------------- see if the su-user exists
- unless (&Apache::lonnet::homeserver($suname,$sudom) eq 'no_host') {
-# ------------------------------ see if the su-user is not too highly privileged
- if (&Apache::lonnet::privileged($suname,$sudom)) {
- &Apache::lonnet::logthis('Attempted switch user to privileged user');
- } else {
- my $noprivswitch;
-#
-# su-user's home server and user's home server must have one of:
-# (a) same domain
-# (b) same primary library server for the two domains
-# (c) same "internet domain" for primary library server(s) for home servers' domains
-#
- my $suprim = &Apache::lonnet::domain($sudom,'primary');
- my $suintdom = &Apache::lonnet::internet_dom($suprim);
- unless ($sudom eq $form{'udom'}) {
- my $uprim = &Apache::lonnet::domain($form{'udom'},'primary');
- my $uintdom = &Apache::lonnet::internet_dom($uprim);
- unless ($suprim eq $uprim) {
- unless ($suintdom eq $uintdom) {
- &Apache::lonnet::logthis('Attempted switch user '
- .'to user with different "internet domain".');
- $noprivswitch = 1;
- }
- }
- }
-
- unless ($noprivswitch) {
-#
-# server where log-in occurs must have same "internet domain" as su-user's home
-# server
-#
- my $lonhost = $r->dir_config('lonHostID');
- my $hostintdom = &Apache::lonnet::internet_dom($lonhost);
- if ($hostintdom ne $suintdom) {
- &Apache::lonnet::logthis('Attempted switch user on a '
- .'server with a different "internet domain".');
- } else {
-
-# -------------------------------------------------------- actually switch users
-
- &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.
- $form{'udom'}.' logging in as '.$suname.':'.$sudom);
- $form{'uname'}=$suname;
- if ($form{'udom'} ne $sudom) {
- $form{'udom'}=$sudom;
- }
- }
- }
- }
- }
- } else {
- &Apache::lonnet::logthis('Non-privileged user attempting switch user');
- }
- }
-
- my ($is_balancer,$otherserver);
-
- unless ($hosthere) {
- ($is_balancer,$otherserver) =
- &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'},'login');
- if ($is_balancer) {
- # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
- my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
- if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
- $otherserver = $found_server;
- }
- if ($otherserver eq '') {
- my $lowest_load;
- ($otherserver,undef,undef,undef,$lowest_load) = &Apache::lonnet::choose_server($form{'udom'});
- if ($lowest_load > 100) {
- $otherserver = &Apache::lonnet::spareserver($r,$lowest_load,$lowest_load,1,$form{'udom'});
- }
- }
- if ($otherserver ne '') {
- my @hosts = &Apache::lonnet::current_machine_ids();
- if (grep(/^\Q$otherserver\E$/,@hosts)) {
- $hosthere = $otherserver;
- }
- }
- }
- }
-
- if (($is_balancer) && (!$hosthere)) {
- if ($otherserver) {
- &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
- \%form);
- my $switchto = '/adm/switchserver?otherserver='.$otherserver;
- if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
- $switchto .= '&origurl='.$firsturl;
- }
- if ($form{'role'}) {
- $switchto .= '&role='.$form{'role'};
- }
- if ($form{'symb'}) {
- $switchto .= '&symb='.$form{'symb'};
- }
- $r->internal_redirect($switchto);
- } else {
- &Apache::loncommon::content_type($r,'text/html');
- $r->send_http_header;
- $r->print(&noswitch());
- }
- return OK;
- } else {
- if (!&check_can_host($r,\%form,$authhost)) {
- my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
- if ($otherserver) {
- &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
- \%form);
- my $switchto = '/adm/switchserver?otherserver='.$otherserver;
- if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
- $switchto .= '&origurl='.$firsturl;
- }
- if ($form{'role'}) {
- $switchto .= '&role='.$form{'role'};
- }
- if ($form{'symb'}) {
- $switchto .= '&symb='.$form{'symb'};
- }
- $r->internal_redirect($switchto);
- } else {
- &Apache::loncommon::content_type($r,'text/html');
- $r->send_http_header;
- $r->print(&noswitch());
- }
- return OK;
- }
-
-# ------------------------------------------------------- Do the load balancing
-
-# ---------------------------------------------------------- Determine own load
- my $loadlim = $r->dir_config('lonLoadLim');
- my $loadavg;
- {
- my $loadfile=Apache::File->new('/proc/loadavg');
- $loadavg=<$loadfile>;
- }
- $loadavg =~ s/\s.*//g;
- my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
- my $userloadpercent=&Apache::lonnet::userload();
-
-# ---------------------------------------------------------- Are we overloaded?
- if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
- my $unloaded=Apache::lonnet::spareserver($r,$loadpercent,$userloadpercent,1,$form{'udom'});
- if (!$unloaded) {
- ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
- }
- if ($unloaded) {
- &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
- undef,\%form);
- $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
- return OK;
- }
- }
- if (($is_balancer) && ($hosthere)) {
- $form{'noloadbalance'} = $hosthere;
- }
- my $extra_env;
- if (($hosthere) && ($sessiondata{'sessionserver'} ne '')) {
- if ($sessiondata{'origurl'} ne '') {
- $firsturl = $sessiondata{'origurl'};
- $form{'firsturl'} = $sessiondata{'origurl'};
- my @names = ('role','symb','linkprot','linkkey');
- foreach my $item (@names) {
- if ($sessiondata{$item} ne '') {
- $form{$item} = $sessiondata{$item};
- }
- }
- }
- }
- &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
- \%form);
- return OK;
- }
-}
-
-sub get_form_items {
- my ($r) = @_;
- my $buffer;
- if ($r->header_in('Content-length') > 0) {
- $r->read($buffer,$r->header_in('Content-length'),0);
- }
- my %form;
- foreach my $pair (split(/&/,$buffer)) {
- my ($name,$value) = split(/=/,$pair);
- $value =~ tr/+/ /;
- $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
- $form{$name}=$value;
- }
- return %form;
-}
-
-sub set_retry_token {
- my ($form,$lonhost,$querystr) = @_;
- if (ref($form) eq 'HASH') {
- my ($firsturl,$token,$extras,@names);
- @names = ('role','symb','iptoken');
- foreach my $name (@names) {
- if ($form->{$name} ne '') {
- $extras .= '&'.$name.'='.&escape($form->{$name});
- last if ($name eq 'linkprot');
- }
- }
- my $firsturl = $form->{'firsturl'};
- if (($firsturl ne '') || ($extras ne '')) {
- $extras .= ':retry';
- $token = &Apache::lonnet::reply('tmpput:'.&escape($firsturl).
- $extras,$lonhost);
- if (($token eq 'con_lost') || ($token eq 'no_such_host')) {
- return 'fail';
- } else {
- if (ref($querystr)) {
- $$querystr = 'retry='.$token;
- }
- return 'ok';
- }
- }
- }
- return;
-}
-
-sub check_can_host {
- my ($r,$form,$authhost,$domdesc) = @_;
- return unless (ref($form) eq 'HASH');
- my $canhost = 1;
- my $lonhost = $r->dir_config('lonHostID');
- my $udom = $form->{'udom'};
- my @intdoms;
- my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
- if (ref($internet_names) eq 'ARRAY') {
- @intdoms = @{$internet_names};
- }
- my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
- my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
- unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
- my $machine_dom = &Apache::lonnet::host_domain($lonhost);
- my $hostname = &Apache::lonnet::hostname($lonhost);
- my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
- my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
- my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
- my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
- my $loncaparev;
- if ($authhost eq 'no_account_on_host') {
- $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
- } else {
- $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
- }
- $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
- $udomdefaults{'remotesessions'},
- $defdomdefaults{'hostedsessions'});
- }
- unless ($canhost) {
- if ($authhost eq 'no_account_on_host') {
- my $checkloginvia = 1;
- my ($login_host,$hostname) =
- &Apache::lonnet::choose_server($udom,$checkloginvia);
- &Apache::loncommon::content_type($r,'text/html');
- $r->send_http_header;
- if ($login_host ne '') {
- my $protocol = $Apache::lonnet::protocol{$login_host};
- $protocol = 'http' if ($protocol ne 'https');
- my $alias = &Apache::lonnet::use_proxy_alias($r,$login_host);
- $hostname = $alias if ($alias ne '');
- my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
- $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
- ''.&mt('Account creation').'
'.
- &mt('You do not currently have a LON-CAPA account at this institution.').'
'.
- ''.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'
'.
- ''.&mt('[_1]Log in[_2]','','').
- &Apache::loncommon::end_page());
- } else {
- $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
- '
'.&mt('Account creation unavailable').'
'.
- &mt('You do not currently have a LON-CAPA account at this institution.').'
'.
- ''.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'
'.
- &Apache::loncommon::end_page());
- }
- } else {
- &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
- $form);
- my ($otherserver) = &Apache::lonnet::choose_server($udom);
- $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
- }
- }
- return $canhost;
-}
-
-sub noswitch {
- my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
- ''.&mt('Session unavailable').'
'.
- &mt('This LON-CAPA server is unable to host your session.').'
'.
- ''.&mt('Currently no other LON-CAPA server is available to host your session either.').'
'.
- &Apache::loncommon::end_page();
- return $result;
-}
-
-sub loginhelpdisplay {
- my ($authdomain) = @_;
- my $login_help = 1;
- my $lang = &Apache::lonlocal::current_language();
- if ($login_help) {
- my $dom = $authdomain;
- if ($dom eq '') {
- $dom = &Apache::lonnet::default_login_domain();
- }
- my %domconfhash = &Apache::loncommon::get_domainconf($dom);
- my $loginhelp_url;
- if ($lang) {
- $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
- if ($loginhelp_url ne '') {
- return $loginhelp_url;
- }
- }
- $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
- if ($loginhelp_url ne '') {
- return $loginhelp_url;
- } else {
- return '/adm/loginproblems.html';
- }
- }
- return;
-}
-
-sub alternate_unames_check {
- my ($uname,$udom) = @_;
- my %possunames;
- my %domdefs = &Apache::lonnet::get_domain_defaults($udom);
- if (ref($domdefs{'unamemap_rule'}) eq 'ARRAY') {
- if (@{$domdefs{'unamemap_rule'}} > 0) {
- %possunames =
- &Apache::lonnet::inst_rulecheck($udom,$uname,undef,
- 'unamemap',$domdefs{'unamemap_rule'});
- }
- }
- return %possunames;
-}
-
-1;
-__END__
-
-
+# The LearningOnline Network
+# User Authentication Module
+#
+# $Id: lonauth.pm,v 1.139 2016/02/17 19:15:40 raeburn Exp $
+#
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+#
+# LON-CAPA is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# LON-CAPA is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+# http://www.lon-capa.org/
+#
+
+package Apache::lonauth;
+
+use strict;
+use LONCAPA;
+use Apache::Constants qw(:common);
+use CGI qw(:standard);
+use DynaLoader; # for Crypt::DES version
+use Crypt::DES;
+use Apache::loncommon();
+use Apache::lonnet;
+use Apache::lonmenu();
+use Apache::createaccount;
+use Fcntl qw(:flock);
+use Apache::lonlocal;
+use Apache::File();
+use HTML::Entities;
+
+# ------------------------------------------------------------ Successful login
+sub success {
+ my ($r, $username, $domain, $authhost, $lowerurl, $extra_env,
+ $form) = @_;
+
+# ------------------------------------------------------------ Get cookie ready
+ my $cookie =
+ &Apache::loncommon::init_user_environment($r, $username, $domain,
+ $authhost, $form,
+ {'extra_env' => $extra_env,});
+
+ my $public=($username eq 'public' && $domain eq 'public');
+
+ if ($public or $lowerurl eq 'noredirect') { return $cookie; }
+
+# -------------------------------------------------------------------- Log this
+
+ &Apache::lonnet::log($domain,$username,$authhost,
+ "Login $ENV{'REMOTE_ADDR'}");
+
+# ------------------------------------------------- Check for critical messages
+
+ my @what=&Apache::lonnet::dump('critical',$domain,$username);
+ if ($what[0]) {
+ if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
+ $lowerurl='/adm/email?critical=display';
+ }
+ }
+
+# ------------------------------------------------------------ Get cookie ready
+ $cookie="lonID=$cookie; path=/";
+# -------------------------------------------------------- Menu script and info
+ my $destination = $lowerurl;
+
+ if (defined($form->{role})) {
+ my $envkey = 'user.role.'.$form->{role};
+ my $now=time;
+ my $then=$env{'user.login.time'};
+ my $refresh=$env{'user.refresh.time'};
+ my $update=$env{'user.update.time'};
+ if (!$update) {
+ $update = $then;
+ }
+ if (exists($env{$envkey})) {
+ my ($role,$where,$trolecode,$tstart,$tend,$tremark,$tstatus);
+ &Apache::lonnet::role_status($envkey,$update,$refresh,$now,\$role,\$where,
+ \$trolecode,\$tstatus,\$tstart,\$tend);
+ if ($tstatus eq 'is') {
+ $destination .= ($destination =~ /\?/) ? '&' : '?';
+ my $newrole = &HTML::Entities::encode($form->{role},'"<>&');
+ $destination .= 'selectrole=1&'.$newrole.'=1';
+ }
+ }
+ }
+ if (defined($form->{symb})) {
+ my $destsymb = $form->{symb};
+ $destination .= ($destination =~ /\?/) ? '&' : '?';
+ if ($destsymb =~ /___/) {
+ # FIXME Need to deal with encrypted symbs and urls as needed.
+ my ($map,$resid,$desturl)=split(/___/,$destsymb);
+ $desturl = &Apache::lonnet::clutter($desturl);
+ $desturl = &HTML::Entities::encode($desturl,'"<>&');
+ $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
+ $destination .= 'destinationurl='.$desturl.
+ '&destsymb='.$destsymb;
+ } else {
+ $destsymb = &HTML::Entities::encode($destsymb,'"<>&');
+ $destination .= 'destinationurl='.$destsymb;
+ }
+ }
+ if ($destination =~ m{^/adm/roles}) {
+ $destination .= ($destination =~ /\?/) ? '&' : '?';
+ $destination .= 'source=login';
+ }
+
+ my $windowinfo = Apache::lonhtmlcommon::scripttag('self.name="loncapaclient";');
+ my $header = '';
+ my $brcrum = [{'href' => '',
+ 'text' => 'Successful Login'},];
+ my $start_page=&Apache::loncommon::start_page('Successful Login',
+ $header,
+ {'bread_crumbs' => $brcrum,});
+ my $end_page =&Apache::loncommon::end_page();
+
+ my $continuelink=''.&mt('Continue').'';
+# ------------------------------------------------- Output for successful login
+
+ &Apache::loncommon::content_type($r,'text/html');
+ $r->header_out('Set-cookie' => $cookie);
+ $r->send_http_header;
+
+ my %lt=&Apache::lonlocal::texthash(
+ 'wel' => 'Welcome',
+ 'pro' => 'Login problems?',
+ );
+ my $loginhelp = &loginhelpdisplay($domain);
+ if ($loginhelp) {
+ $loginhelp = ''.$lt{'pro'}.'
';
+ }
+
+ my $welcome = &mt('Welcome to the Learning[_1]Online[_2] Network with CAPA. Please wait while your session is being set up.','','');
+ $r->print(<$lt{'wel'}
+$welcome
+$loginhelp
+$continuelink
+$end_page
+ENDSUCCESS
+ return;
+}
+
+# --------------------------------------------------------------- Failed login!
+
+sub failed {
+ my ($r,$message,$form) = @_;
+ (undef,undef,undef,my $clientmathml,my $clientunicode) =
+ &Apache::loncommon::decode_user_agent();
+ my $args = {};
+ if ($clientunicode && !$clientmathml) {
+ $args = {'browser.unicode' => 1};
+ }
+
+ my $start_page = &Apache::loncommon::start_page('Unsuccessful Login',undef,$args);
+ my $uname = &Apache::loncommon::cleanup_html($form->{'uname'});
+ my $udom = &Apache::loncommon::cleanup_html($form->{'udom'});
+ if (&Apache::lonnet::domain($udom,'description') eq '') {
+ undef($udom);
+ }
+ my $retry = '/adm/login';
+ if ($uname eq $form->{'uname'}) {
+ $retry .= '?username='.$uname;
+ }
+ if ($udom) {
+ $retry .= (($retry=~/\?/)?'&':'?').'domain='.$udom;
+ }
+ if (exists($form->{role})) {
+ my $role = &Apache::loncommon::cleanup_html($form->{role});
+ if ($role ne '') {
+ $retry .= (($retry=~/\?/)?'&':'?').'role='.$role;
+ }
+ }
+ if (exists($form->{symb})) {
+ my $symb = &Apache::loncommon::cleanup_html($form->{symb});
+ if ($symb ne '') {
+ $retry .= (($retry=~/\?/)?'&':'?').'symb='.$symb;
+ }
+ }
+ my $end_page = &Apache::loncommon::end_page();
+ &Apache::loncommon::content_type($r,'text/html');
+ $r->send_http_header;
+ my @actions =
+ (&mt('Please [_1]log in again[_2].','',''));
+ my $loginhelp = &loginhelpdisplay($udom);
+ if ($loginhelp) {
+ push(@actions, ''.&mt('Login problems?').'');
+ }
+ #FIXME: link to helpdesk might be added here
+
+ $r->print(
+ $start_page
+ .''.&mt('Sorry ...').'
'
+ .&Apache::lonhtmlcommon::confirm_success(&mt($message),1).'
'
+ .&Apache::lonhtmlcommon::actionbox(\@actions)
+ .$end_page
+ );
+ }
+
+# ------------------------------------------------------------------ Rerouting!
+
+sub reroute {
+ my ($r) = @_;
+ &Apache::loncommon::content_type($r,'text/html');
+ $r->send_http_header;
+ my $msg=''.&mt('Sorry ...').'
'
+ .&mt('Please [_1]log in again[_2].');
+ &Apache::loncommon::simple_error_page($r,'Rerouting',$msg,{'no_auto_mt_msg' => 1});
+}
+
+# ---------------------------------------------------------------- Main handler
+
+sub handler {
+ my $r = shift;
+ my $londocroot = $r->dir_config('lonDocRoot');
+ my $form;
+# Are we re-routing?
+ if (-e "$londocroot/lon-status/reroute.txt") {
+ &reroute($r);
+ return OK;
+ }
+
+ &Apache::lonlocal::get_language_handle($r);
+
+# -------------------------------- Prevent users from attempting to login twice
+ my $handle = &Apache::lonnet::check_for_valid_session($r);
+ if ($handle ne '') {
+ my $lonidsdir=$r->dir_config('lonIDsDir');
+ if ($handle=~/^publicuser\_/) {
+# For "public user" - remove it, we apparently really want to login
+ unlink($r->dir_config('lonIDsDir')."/$handle.id");
+ } else {
+# Indeed, a valid token is found
+ &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
+ &Apache::loncommon::content_type($r,'text/html');
+ $r->send_http_header;
+ my $start_page =
+ &Apache::loncommon::start_page('Already logged in');
+ my $end_page =
+ &Apache::loncommon::end_page();
+ my $dest = '/adm/roles';
+ if ($env{'form.firsturl'} ne '') {
+ $dest = $env{'form.firsturl'};
+ }
+ $r->print(
+ $start_page
+ .''.&mt('You are already logged in!').'
'
+ .''.&mt('Please either [_1]continue the current session[_2] or [_3]log out[_4].'
+ ,'','','','')
+ .'
'
+ .$end_page
+ );
+ return OK;
+ }
+ }
+
+# ---------------------------------------------------- No valid token, continue
+
+
+ my $buffer;
+ if ($r->header_in('Content-length') > 0) {
+ $r->read($buffer,$r->header_in('Content-length'),0);
+ }
+ my %form;
+ foreach my $pair (split(/&/,$buffer)) {
+ my ($name,$value) = split(/=/,$pair);
+ $value =~ tr/+/ /;
+ $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
+ $form{$name}=$value;
+ }
+
+ if ((!$form{'uname'}) || (!$form{'upass0'}) || (!$form{'udom'})) {
+ &failed($r,'Username, password and domain need to be specified.',
+ \%form);
+ return OK;
+ }
+
+# split user logging in and "su"-user
+
+ ($form{'uname'},$form{'suname'})=split(/\:/,$form{'uname'});
+ $form{'uname'} = &LONCAPA::clean_username($form{'uname'});
+ $form{'suname'}= &LONCAPA::clean_username($form{'suname'});
+ $form{'udom'} = &LONCAPA::clean_domain( $form{'udom'});
+
+ my $role = $r->dir_config('lonRole');
+ my $domain = $r->dir_config('lonDefDomain');
+ my $prodir = $r->dir_config('lonUsersDir');
+ my $contact_name = &mt('LON-CAPA helpdesk');
+
+# ---------------------------------------- Get the information from login token
+
+ my $tmpinfo=Apache::lonnet::reply('tmpget:'.$form{'logtoken'},
+ $form{'serverid'});
+
+ if (($tmpinfo=~/^error/) || ($tmpinfo eq 'con_lost') ||
+ ($tmpinfo eq 'no_such_host')) {
+ &failed($r,'Information needed to verify your login information is missing, inaccessible or expired.',\%form);
+ return OK;
+ } else {
+ my $reply = &Apache::lonnet::reply('tmpdel:'.$form{'logtoken'},
+ $form{'serverid'});
+ if ( $reply ne 'ok' ) {
+ &failed($r,'Session could not be opened.',\%form);
+ &Apache::lonnet::logthis("ERROR got a reply of $reply when trying to contact ". $form{'serverid'}." to get login token");
+ return OK;
+ }
+ }
+
+ if (!&Apache::lonnet::domain($form{'udom'})) {
+ &failed($r,'The domain you provided is not a valid LON-CAPA domain.',\%form);
+ return OK;
+ }
+
+ my ($key,$firsturl,$rolestr,$symbstr,$iptokenstr)=split(/&/,$tmpinfo);
+ if ($rolestr) {
+ $rolestr = &unescape($rolestr);
+ }
+ if ($symbstr) {
+ $symbstr= &unescape($symbstr);
+ }
+ if ($iptokenstr) {
+ $iptokenstr = &unescape($iptokenstr);
+ }
+ if ($rolestr =~ /^role=/) {
+ (undef,$form{'role'}) = split('=',$rolestr);
+ }
+ if ($symbstr =~ /^symb=/) {
+ (undef,$form{'symb'}) = split('=',$symbstr);
+ }
+ if ($iptokenstr =~ /^iptoken=/) {
+ (undef,$form{'iptoken'}) = split('=',$iptokenstr);
+ }
+
+ my $upass = $ENV{HTTPS} ? $form{'upass0'}
+ : &Apache::loncommon::des_decrypt($key,$form{'upass0'});
+
+# ---------------------------------------------------------------- Authenticate
+
+ my %domconfig = &Apache::lonnet::get_dom('configuration',['usercreation'],$form{'udom'});
+ my ($cancreate,$statustocreate) =
+ &Apache::createaccount::get_creation_controls($form{'udom'},$domconfig{'usercreation'});
+ my $defaultauth;
+ if (ref($cancreate) eq 'ARRAY') {
+ if (grep(/^login$/,@{$cancreate})) {
+ $defaultauth = 1;
+ }
+ }
+ my $clientcancheckhost = 1;
+ my $authhost=Apache::lonnet::authenticate($form{'uname'},$upass,
+ $form{'udom'},$defaultauth,
+ $clientcancheckhost);
+
+# --------------------------------------------------------------------- Failed?
+
+ if ($authhost eq 'no_host') {
+ &failed($r,'Username and/or password could not be authenticated.',
+ \%form);
+ return OK;
+ } elsif ($authhost eq 'no_account_on_host') {
+ if ($defaultauth) {
+ my $domdesc = &Apache::lonnet::domain($form{'udom'},'description');
+ unless (&check_can_host($r,\%form,'no_account_on_host',$domdesc)) {
+ return OK;
+ }
+ my $start_page =
+ &Apache::loncommon::start_page('Create a user account in LON-CAPA');
+ my $lonhost = $r->dir_config('lonHostID');
+ my $origmail = $Apache::lonnet::perlvar{'lonSupportEMail'};
+ my $contacts =
+ &Apache::loncommon::build_recipient_list(undef,'helpdeskmail',
+ $form{'udom'},$origmail);
+ my ($contact_email) = split(',',$contacts);
+ my $output =
+ &Apache::createaccount::username_check($form{'uname'},$form{'udom'},
+ $domdesc,'',$lonhost,
+ $contact_email,$contact_name,
+ undef,$statustocreate);
+ &Apache::loncommon::content_type($r,'text/html');
+ $r->send_http_header;
+ &Apache::createaccount::print_header($r,$start_page);
+ $r->print(''.&mt('Account creation').'
'.
+ &mt('Although your username and password were authenticated, you do not currently have a LON-CAPA account at this institution.').'
'.
+ $output.&Apache::loncommon::end_page());
+ return OK;
+ } else {
+ &failed($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);
+ return OK;
+ }
+ }
+
+ if (($firsturl eq '') ||
+ ($firsturl=~/^\/adm\/(logout|remote)/)) {
+ $firsturl='/adm/roles';
+ }
+
+ my $hosthere;
+ if ($form{'iptoken'}) {
+ my %sessiondata = &Apache::lonnet::tmpget($form{'iptoken'});
+ my $delete = &Apache::lonnet::tmpdel($form{'iptoken'});
+ if (($sessiondata{'domain'} eq $form{'udom'}) &&
+ ($sessiondata{'username'} eq $form{'uname'})) {
+ $hosthere = 1;
+ }
+ }
+
+# --------------------------------- Are we attempting to login as somebody else?
+ if ($form{'suname'}) {
+# ------------ see if the original user has enough privileges to pull this stunt
+ if (&Apache::lonnet::privileged($form{'uname'},$form{'udom'})) {
+# ---------------------------------------------------- see if the su-user exists
+ unless (&Apache::lonnet::homeserver($form{'suname'},$form{'udom'})
+ eq 'no_host') {
+ &Apache::lonnet::logthis(&Apache::lonnet::homeserver($form{'suname'},$form{'udom'}));
+# ------------------------------ see if the su-user is not too highly privileged
+ unless (&Apache::lonnet::privileged($form{'suname'},$form{'udom'})) {
+# -------------------------------------------------------- actually switch users
+ &Apache::lonnet::logperm('User '.$form{'uname'}.' at '.$form{'udom'}.
+ ' logging in as '.$form{'suname'});
+ $form{'uname'}=$form{'suname'};
+ } else {
+ &Apache::lonnet::logthis('Attempted switch user to privileged user');
+ }
+ }
+ } else {
+ &Apache::lonnet::logthis('Non-privileged user attempting switch user');
+ }
+ }
+
+ my ($is_balancer,$otherserver);
+
+ unless ($hosthere) {
+ ($is_balancer,$otherserver) =
+ &Apache::lonnet::check_loadbalancing($form{'uname'},$form{'udom'});
+ }
+
+ if ($is_balancer) {
+ if (!$otherserver) {
+ ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
+ }
+ if ($otherserver) {
+ &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
+ \%form);
+ my $switchto = '/adm/switchserver?otherserver='.$otherserver;
+ if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
+ $switchto .= '&origurl='.$firsturl;
+ }
+ if ($form{'role'}) {
+ $switchto .= '&role='.$form{'role'};
+ }
+ if ($form{'symb'}) {
+ $switchto .= '&symb='.$form{'symb'};
+ }
+ $r->internal_redirect($switchto);
+ } else {
+ $r->print(&noswitch());
+ }
+ return OK;
+ } else {
+ if (!&check_can_host($r,\%form,$authhost)) {
+ my ($otherserver) = &Apache::lonnet::choose_server($form{'udom'});
+ if ($otherserver) {
+ &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',undef,
+ \%form);
+ my $switchto = '/adm/switchserver?otherserver='.$otherserver;
+ if (($firsturl) && ($firsturl ne '/adm/switchserver') && ($firsturl ne '/adm/roles')) {
+ $switchto .= '&origurl='.$firsturl;
+ }
+ if ($form{'role'}) {
+ $switchto .= '&role='.$form{'role'};
+ }
+ if ($form{'symb'}) {
+ $switchto .= '&symb='.$form{'symb'};
+ }
+ $r->internal_redirect($switchto);
+ } else {
+ $r->print(&noswitch());
+ }
+ return OK;
+ }
+
+# ------------------------------------------------------- Do the load balancing
+
+# ---------------------------------------------------------- Determine own load
+ my $loadlim = $r->dir_config('lonLoadLim');
+ my $loadavg;
+ {
+ my $loadfile=Apache::File->new('/proc/loadavg');
+ $loadavg=<$loadfile>;
+ }
+ $loadavg =~ s/\s.*//g;
+ my $loadpercent=sprintf("%.1f",100*$loadavg/$loadlim);
+ my $userloadpercent=&Apache::lonnet::userload();
+
+# ---------------------------------------------------------- Are we overloaded?
+ if ((($userloadpercent>100.0)||($loadpercent>100.0))) {
+ my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent,1,$form{'udom'});
+ if (!$unloaded) {
+ ($unloaded) = &Apache::lonnet::choose_server($form{'udom'});
+ }
+ if ($unloaded) {
+ &success($r,$form{'uname'},$form{'udom'},$authhost,'noredirect',
+ undef,\%form);
+ $r->internal_redirect('/adm/switchserver?otherserver='.$unloaded.'&origurl='.$firsturl);
+ return OK;
+ }
+ }
+ &success($r,$form{'uname'},$form{'udom'},$authhost,$firsturl,undef,
+ \%form);
+ return OK;
+ }
+}
+
+sub check_can_host {
+ my ($r,$form,$authhost,$domdesc) = @_;
+ return unless (ref($form) eq 'HASH');
+ my $canhost = 1;
+ my $lonhost = $r->dir_config('lonHostID');
+ my $udom = $form->{'udom'};
+ my @intdoms;
+ my $internet_names = &Apache::lonnet::get_internet_names($lonhost);
+ if (ref($internet_names) eq 'ARRAY') {
+ @intdoms = @{$internet_names};
+ }
+ my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
+ my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
+ unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
+ my $machine_dom = &Apache::lonnet::host_domain($lonhost);
+ my $hostname = &Apache::lonnet::hostname($lonhost);
+ my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname);
+ my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
+ my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
+ my %udomdefaults = &Apache::lonnet::get_domain_defaults($udom);
+ my $loncaparev;
+ if ($authhost eq 'no_account_on_host') {
+ $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom);
+ } else {
+ $loncaparev = &Apache::lonnet::get_server_loncaparev($machine_dom,$lonhost);
+ }
+ $canhost = &Apache::lonnet::can_host_session($udom,$lonhost,$loncaparev,
+ $udomdefaults{'remotesessions'},
+ $defdomdefaults{'hostedsessions'});
+ }
+ unless ($canhost) {
+ if ($authhost eq 'no_account_on_host') {
+ my $checkloginvia = 1;
+ my ($login_host,$hostname) =
+ &Apache::lonnet::choose_server($udom,$checkloginvia);
+ &Apache::loncommon::content_type($r,'text/html');
+ $r->send_http_header;
+ if ($login_host ne '') {
+ my $protocol = $Apache::lonnet::protocol{$login_host};
+ $protocol = 'http' if ($protocol ne 'https');
+ my $newurl = $protocol.'://'.$hostname.'/adm/createaccount';
+ $r->print(&Apache::loncommon::start_page('Create a user account in LON-CAPA').
+ ''.&mt('Account creation').'
'.
+ &mt('You do not currently have a LON-CAPA account at this institution.').'
'.
+ ''.&mt('You will be able to create one by logging into a LON-CAPA server within the [_1] domain.',$domdesc).'
'.
+ ''.&mt('[_1]Log in[_2]','','').
+ &Apache::loncommon::end_page());
+ } else {
+ $r->print(&Apache::loncommon::start_page('Access to LON-CAPA unavailable').
+ '
'.&mt('Account creation unavailable').'
'.
+ &mt('You do not currently have a LON-CAPA account at this institution.').'
'.
+ ''.&mt('Currently a LON-CAPA server is not available within the [_1] domain for you to log-in to, to create an account.',$domdesc).'
'.
+ &Apache::loncommon::end_page());
+ }
+ } else {
+ &success($r,$form->{'uname'},$udom,$authhost,'noredirect',undef,
+ $form);
+ my ($otherserver) = &Apache::lonnet::choose_server($udom);
+ $r->internal_redirect('/adm/switchserver?otherserver='.$otherserver);
+ }
+ }
+ return $canhost;
+}
+
+sub noswitch {
+ my $result = &Apache::loncommon::start_page('Access to LON-CAPA unavailable').
+ ''.&mt('Session unavailable').'
'.
+ &mt('This LON-CAPA server is unable to host your session.').'
'.
+ ''.&mt('Currently no other LON-CAPA server is available to host your session either.').'
'.
+ &Apache::loncommon::end_page();
+ return $result;
+}
+
+sub loginhelpdisplay {
+ my ($authdomain) = @_;
+ my $login_help = 1;
+ my $lang = &Apache::lonlocal::current_language();
+ if ($login_help) {
+ my $dom = $authdomain;
+ if ($dom eq '') {
+ $dom = &Apache::lonnet::default_login_domain();
+ }
+ my %domconfhash = &Apache::loncommon::get_domainconf($dom);
+ my $loginhelp_url;
+ if ($lang) {
+ $loginhelp_url = $domconfhash{$dom.'.login.helpurl_'.$lang};
+ if ($loginhelp_url ne '') {
+ return $loginhelp_url;
+ }
+ }
+ $loginhelp_url = $domconfhash{$dom.'.login.helpurl_nolang'};
+ if ($loginhelp_url ne '') {
+ return $loginhelp_url;
+ } else {
+ return '/adm/loginproblems.html';
+ }
+ }
+ return;
+}
+
+1;
+__END__
+
+