1: # The LearningOnline Network
2: # Switch Servers Handler
3: #
4: # $Id: switchserver.pm,v 1.29 2010/08/18 19:25:12 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::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: 'only_body' => $only_body,});
63: my $end_page = &Apache::loncommon::end_page();
64: $r->print($start_page.$extra_text.$end_page);
65: return OK;
66:
67: }
68:
69: sub handler {
70: my ($r) = @_;
71:
72: my $handle=&init_env($r);
73: if (!defined($handle)) { return FORBIDDEN; }
74:
75: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
76: ['otherserver','role','origurl','symb']);
77:
78: my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
79: if (! $env{'form.otherserver'}) {
80: $env{'form.otherserver'} =
81: &Apache::lonnet::find_existing_session($env{'user.domain'},
82: $env{'user.name'});
83: if (! $env{'form.otherserver'}) {
84: $env{'form.otherserver'} =
85: &Apache::lonnet::spareserver(30000,undef,1);
86: }
87: $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
88: }
89:
90: if (!defined($switch_to)) { return FORBIDDEN; }
91:
92: if ($env{'user.name'} eq 'public'
93: && $env{'user.domain'} eq 'public') {
94: my $url = 'http://'.$switch_to.$r->uri;
95: return &do_redirect($r,$url,1)
96: }
97:
98: my $skip_canhost_check = '';
99: if ($env{'form.role'}) {
100: if (!exists($env{'user.role.'.$env{'form.role'}})) {
101: return FORBIDDEN;
102: } else {
103: my $now = time;
104: my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.role'}});
105: if (($start && $start > $now) || ($end && $end < $now)) {
106: return FORBIDDEN;
107: } elsif ($env{'form.role'} eq 'au./'.$env{'user.domain'}.'/') {
108: if (&Apache::lonnet::homeserver($env{'user.name'},$env{'user.domain'}) eq $env{'form.otherserver'}) {
109: $skip_canhost_check = 1;
110: }
111: } elsif ($env{'form.role'} =~ m{^[ac]a\./($match_domain)/($match_username)/$}) {
112: if (&Apache::lonnet::homeserver($2,$1) eq $env{'form.otherserver'}) {
113: $skip_canhost_check = 1;
114: }
115: }
116: }
117: }
118:
119: unless ($skip_canhost_check) {
120: my $canhost = 1;
121: my $uprimary_id = &Apache::lonnet::domain($env{'user.domain'},'primary');
122: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
123: my @intdoms;
124: my $internet_names = &Apache::lonnet::get_internet_names($env{'form.otherserver'});
125: if (ref($internet_names) eq 'ARRAY') {
126: @intdoms = @{$internet_names};
127: }
128: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
129: my $serverhomeID = &Apache::lonnet::get_server_homeID($switch_to);
130: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
131: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
132: my %udomdefaults = &Apache::lonnet::get_domain_defaults($env{'user.domain'});
133: my $remoterev = &Apache::lonnet::get_server_loncaparev($env{'user.domain'},$env{'form.otherserver'});
134: $canhost =
135: &Apache::lonnet::can_host_session($env{'user.domain'},
136: $env{'form.otherserver'},
137: $remoterev,
138: $udomdefaults{'remotesessions'},
139: $defdomdefaults{'hostedsessions'});
140: }
141: unless ($canhost) { return FORBIDDEN; }
142: }
143:
144: #remove session env, and log event
145: unlink($handle);
146: my %temp=('switchserver' => time.':'.$env{'form.otherserver'},
147: $env{'form.role'});
148: &Apache::lonnet::put('email_status',\%temp);
149: &Apache::lonnet::log($env{'user.domain'},$env{'user.name'},
150: $env{'user.home'},
151: "Switch Server to $env{'form.otherserver'} with role $env{'form.role'} $ENV{'REMOTE_ADDR'}");
152:
153: &Apache::loncommon::content_type($r,'text/html');
154:
155: #expire the cookie
156: my $c = new CGI::Cookie(-name => 'lonID',
157: -value => '',
158: -expires => '-10y',);
159: $r->header_out('Set-cookie' => $c);
160:
161: if ($r->header_only) {
162: $r->send_http_header;
163: return OK;
164: }
165: # -------------------------------------------------------- Menu script and info
166:
167: # ---------------------------------------------------------------- Get handover
168:
169: my %info=('ip' => $ENV{'REMOTE_ADDR'},
170: 'domain' => $env{'user.domain'},
171: 'username' => $env{'user.name'},
172: 'role' => $env{'form.role'},
173: 'server' => $r->dir_config('lonHostID'));
174: if ($env{'form.origurl'}) {
175: $info{'origurl'} = $env{'form.origurl'};
176: }
177: if ($env{'form.symb'}) {
178: $info{'symb'} = $env{'form.symb'};
179: }
180: if ($env{'request.sso.login'}) {
181: $info{'sso.login'} = $env{'request.sso.login'};
182: }
183: if ($env{'request.sso.reloginserver'}) {
184: $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
185: }
186: my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
187: my $url ='http://'.$switch_to.'/adm/login?'.
188: 'domain='.$env{'user.domain'}.
189: '&username='.$env{'user.name'}.
190: '&token='.$token;
191: # --------------------------------------------------------------- Screen Output
192: &Apache::lonnet::flushcourselogs();
193: return &do_redirect($r, $url, 0);
194: }
195:
196: 1;
197: __END__
198:
199:
200:
201:
202:
203:
204:
205:
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