1: # The LearningOnline Network
2: # Switch Servers Handler
3: #
4: # $Id: switchserver.pm,v 1.28.2.2 2010/08/18 19:40:23 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: return OK;
67:
68: }
69:
70: sub handler {
71: my ($r) = @_;
72:
73: my $handle=&init_env($r);
74: if (!defined($handle)) { return FORBIDDEN; }
75:
76: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
77: ['otherserver','role','origurl','symb']);
78:
79: my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
80: if (! $env{'form.otherserver'}) {
81: $env{'form.otherserver'} =
82: &Apache::lonnet::find_existing_session($env{'user.domain'},
83: $env{'user.name'});
84: if (! $env{'form.otherserver'}) {
85: $env{'form.otherserver'} =
86: &Apache::lonnet::spareserver(30000,undef,1);
87: }
88: $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
89: }
90:
91: if (!defined($switch_to)) { return FORBIDDEN; }
92:
93: if ($env{'user.name'} eq 'public'
94: && $env{'user.domain'} eq 'public') {
95: my $url = 'http://'.$switch_to.$r->uri;
96: return &do_redirect($r,$url,1)
97: }
98:
99: my $skip_canhost_check = '';
100: if ($env{'form.role'}) {
101: if (!exists($env{'user.role.'.$env{'form.role'}})) {
102: return FORBIDDEN;
103: } else {
104: my $now = time;
105: my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.role'}});
106: if (($start && $start > $now) || ($end && $end < $now)) {
107: return FORBIDDEN;
108: } elsif ($env{'form.role'} eq 'au./'.$env{'user.domain'}.'/') {
109: if (&Apache::lonnet::homeserver($env{'user.name'},$env{'user.domain'}) eq $env{'form.otherserver'}) {
110: $skip_canhost_check = 1;
111: }
112: } elsif ($env{'form.role'} =~ m{^[ac]a\./($match_domain)/($match_username)/$}) {
113: if (&Apache::lonnet::homeserver($2,$1) eq $env{'form.otherserver'}) {
114: $skip_canhost_check = 1;
115: }
116: }
117: }
118: }
119:
120: unless ($skip_canhost_check) {
121: my $canhost = 1;
122: my $uprimary_id = &Apache::lonnet::domain($env{'user.domain'},'primary');
123: my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
124: my @intdoms;
125: my $internet_names = &Apache::lonnet::get_internet_names($env{'form.otherserver'});
126: if (ref($internet_names) eq 'ARRAY') {
127: @intdoms = @{$internet_names};
128: }
129: unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
130: my $serverhomeID = &Apache::lonnet::get_server_homeID($switch_to);
131: my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
132: my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
133: my %udomdefaults = &Apache::lonnet::get_domain_defaults($env{'user.domain'});
134: my $remoterev = &Apache::lonnet::get_server_loncaparev($env{'user.domain'},$env{'form.otherserver'});
135: $canhost =
136: &Apache::lonnet::can_host_session($env{'user.domain'},
137: $env{'form.otherserver'},
138: $remoterev,
139: $udomdefaults{'remotesessions'},
140: $defdomdefaults{'hostedsessions'});
141: }
142: unless ($canhost) { return FORBIDDEN; }
143: }
144:
145: #remove session env, and log event
146: unlink($handle);
147: my %temp=('switchserver' => time.':'.$env{'form.otherserver'},
148: $env{'form.role'});
149: &Apache::lonnet::put('email_status',\%temp);
150: &Apache::lonnet::log($env{'user.domain'},$env{'user.name'},
151: $env{'user.home'},
152: "Switch Server to $env{'form.otherserver'} with role $env{'form.role'} $ENV{'REMOTE_ADDR'}");
153:
154: &Apache::loncommon::content_type($r,'text/html');
155:
156: #expire the cookie
157: my $c = new CGI::Cookie(-name => 'lonID',
158: -value => '',
159: -expires => '-10y',);
160: $r->header_out('Set-cookie' => $c);
161:
162: if ($r->header_only) {
163: $r->send_http_header;
164: return OK;
165: }
166: # -------------------------------------------------------- Menu script and info
167:
168: my $windowinfo=
169: &Apache::lonmenu::close().
170: &Apache::lonnavmaps::close();
171: # ---------------------------------------------------------------- Get handover
172:
173: my %info=('ip' => $ENV{'REMOTE_ADDR'},
174: 'domain' => $env{'user.domain'},
175: 'username' => $env{'user.name'},
176: 'role' => $env{'form.role'},
177: 'server' => $r->dir_config('lonHostID'));
178: if ($env{'form.origurl'}) {
179: $info{'origurl'} = $env{'form.origurl'};
180: }
181: if ($env{'form.symb'}) {
182: $info{'symb'} = $env{'form.symb'};
183: }
184: if ($env{'request.sso.login'}) {
185: $info{'sso.login'} = $env{'request.sso.login'};
186: }
187: if ($env{'request.sso.reloginserver'}) {
188: $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
189: }
190: my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
191: my $url ='http://'.$switch_to.'/adm/login?'.
192: 'domain='.$env{'user.domain'}.
193: '&username='.$env{'user.name'}.
194: '&token='.$token;
195: # --------------------------------------------------------------- Screen Output
196: &Apache::lonnet::flushcourselogs();
197: return &do_redirect($r,$url,0,$windowinfo);
198: }
199:
200: 1;
201: __END__
202:
203:
204:
205:
206:
207:
208:
209:
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