1: # The LearningOnline Network
2: # Switch Servers Handler
3: #
4: # $Id: switchserver.pm,v 1.28.2.4 2011/08/02 14:20:42 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::switchserver;
30:
31: use strict;
32: use Apache::Constants qw(:common);
33: use Apache::lonnet;
34: use Apache::lonmenu;
35: use CGI::Cookie();
36: use Apache::lonlocal;
37: use LONCAPA qw(:DEFAULT :match);
38:
39: sub init_env {
40: my ($r) = @_;
41:
42: if (-e $env{'user.environment'}) {
43: return $env{'user.environment'};
44: }
45: my $requrl=$r->uri;
46: my $handle= &Apache::lonnet::check_for_valid_session($r);
47: if ($handle ne '') {
48: return undef;
49: }
50: my $lonidsdir=$r->dir_config('lonIDsDir');
51: &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
52:
53: return $r->dir_config('lonIDsDir')."/$handle.id";
54: }
55:
56: sub do_redirect {
57: my ($r,$url,$only_body,$extra_text) = @_;
58: $r->send_http_header;
59: my $start_page =
60: &Apache::loncommon::start_page('Switching Server ...',undef,
61: {'redirect' => [0.5,$url],
62: 'no_inline_link' => 1,
63: 'only_body' => $only_body,});
64: my $end_page = &Apache::loncommon::end_page();
65: $r->print($start_page.$extra_text.$end_page);
66: unless ($env{'user.name'} eq 'public' && ($env{'user.domain'} eq 'public')) {
67: $r->register_cleanup(\&flush_course_logs);
68: }
69: return OK;
70:
71: }
72:
73: sub flush_course_logs {
74: &Apache::lonnet::flushcourselogs();
75: return OK;
76: }
77:
78: sub handler {
79: my ($r) = @_;
80:
81: my $handle=&init_env($r);
82: if (!defined($handle)) { return FORBIDDEN; }
83:
84: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
85: ['otherserver','role','origurl','symb']);
86:
87: my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
88: if (! $env{'form.otherserver'}) {
89: $env{'form.otherserver'} =
90: &Apache::lonnet::find_existing_session($env{'user.domain'},
91: $env{'user.name'});
92: if (! $env{'form.otherserver'}) {
93: $env{'form.otherserver'} =
94: &Apache::lonnet::spareserver(30000,undef,1);
95: }
96: $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
97: }
98:
99: if (!defined($switch_to)) { return FORBIDDEN; }
100:
101: if ($env{'user.name'} eq 'public'
102: && $env{'user.domain'} eq 'public') {
103: my $url = 'http://'.$switch_to.$r->uri;
104: return &do_redirect($r,$url,1)
105: }
106:
107: my $skip_canhost_check = '';
108: if ($env{'form.role'}) {
109: if (!exists($env{'user.role.'.$env{'form.role'}})) {
110: return FORBIDDEN;
111: } else {
112: my $now = time;
113: my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.role'}});
114: if (($start && $start > $now) || ($end && $end < $now)) {
115: return FORBIDDEN;
116: } elsif ($env{'form.role'} eq 'au./'.$env{'user.domain'}.'/') {
117: if (&Apache::lonnet::homeserver($env{'user.name'},$env{'user.domain'}) eq $env{'form.otherserver'}) {
118: $skip_canhost_check = 1;
119: }
120: } elsif ($env{'form.role'} =~ m{^[ac]a\./($match_domain)/($match_username)$}) {
121: if (&Apache::lonnet::homeserver($2,$1) eq $env{'form.otherserver'}) {
122: $skip_canhost_check = 1;
123: }
124: }
125: }
126: }
127:
128: unless ($skip_canhost_check) {
129: my $canhost = 1;
130: my $uprimary_id = &Apache::lonnet::domain($env{'user.domain'},'primary');
131: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
132: my @intdoms;
133: my $internet_names = &Apache::lonnet::get_internet_names($env{'form.otherserver'});
134: if (ref($internet_names) eq 'ARRAY') {
135: @intdoms = @{$internet_names};
136: }
137: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
138: my $serverhomeID = &Apache::lonnet::get_server_homeID($switch_to);
139: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
140: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
141: my %udomdefaults = &Apache::lonnet::get_domain_defaults($env{'user.domain'});
142: my $remoterev = &Apache::lonnet::get_server_loncaparev($env{'user.domain'},$env{'form.otherserver'});
143: $canhost =
144: &Apache::lonnet::can_host_session($env{'user.domain'},
145: $env{'form.otherserver'},
146: $remoterev,
147: $udomdefaults{'remotesessions'},
148: $defdomdefaults{'hostedsessions'});
149: }
150: unless ($canhost) { return FORBIDDEN; }
151: }
152:
153: #remove session env, and log event
154: unlink($handle);
155: my %temp=('switchserver' => time.':'.$env{'form.otherserver'},
156: $env{'form.role'});
157: &Apache::lonnet::put('email_status',\%temp);
158: &Apache::lonnet::log($env{'user.domain'},$env{'user.name'},
159: $env{'user.home'},
160: "Switch Server to $env{'form.otherserver'} with role $env{'form.role'} $ENV{'REMOTE_ADDR'}");
161:
162: &Apache::loncommon::content_type($r,'text/html');
163:
164: #expire the cookie
165: my $c = new CGI::Cookie(-name => 'lonID',
166: -value => '',
167: -expires => '-10y',);
168: $r->header_out('Set-cookie' => $c);
169:
170: if ($r->header_only) {
171: $r->send_http_header;
172: return OK;
173: }
174: # -------------------------------------------------------- Menu script and info
175:
176: my $windowinfo=
177: &Apache::lonmenu::close().
178: &Apache::lonnavmaps::close();
179: # ---------------------------------------------------------------- Get handover
180:
181: my %info=('ip' => $ENV{'REMOTE_ADDR'},
182: 'domain' => $env{'user.domain'},
183: 'username' => $env{'user.name'},
184: 'role' => $env{'form.role'},
185: 'server' => $r->dir_config('lonHostID'));
186: if ($env{'form.origurl'}) {
187: $info{'origurl'} = $env{'form.origurl'};
188: }
189: if ($env{'form.symb'}) {
190: $info{'symb'} = $env{'form.symb'};
191: }
192: if ($env{'request.sso.login'}) {
193: $info{'sso.login'} = $env{'request.sso.login'};
194: }
195: if ($env{'request.sso.reloginserver'}) {
196: $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
197: }
198: my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
199: my $url ='http://'.$switch_to.'/adm/login?'.
200: 'domain='.$env{'user.domain'}.
201: '&username='.$env{'user.name'}.
202: '&token='.$token;
203: # --------------------------------------------------------------- Screen Output
204: return &do_redirect($r,$url,0,$windowinfo);
205: }
206:
207: 1;
208: __END__
209:
210:
211:
212:
213:
214:
215:
216:
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