1: # The LearningOnline Network
2: # Login Screen
3: #
4: # $Id: lonlogin.pm,v 1.40 2003/04/03 21:53:51 albertel 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: # 5/21/99,5/22,5/25,5/26,5/31,6/2,6/10,7/12,7/14,
29: # 1/14/00,5/29,5/30,6/1,6/29,7/1,11/9,
30: # 1/17/01 Gerd Kortemeyer
31: #
32: # 2/7/02,2/8,2/12,2/14,2/15,2/19 Josh Brunskole
33: #
34: # 7/10/02 Jeremy Bowers
35:
36: package Apache::lonlogin;
37:
38: use strict;
39: use Apache::Constants qw(:common);
40: use Apache::File ();
41: use Apache::lonnet();
42: use Apache::loncommon();
43:
44: sub handler {
45: my $r = shift;
46: $r->content_type('text/html');
47: &Apache::loncommon::no_cache($r);
48: $r->send_http_header;
49: return OK if $r->header_only;
50:
51:
52: &Apache::loncommon::get_unprocessed_cgi
53: ($ENV{'QUERY_STRING'}.'&'.$ENV{'request.querystring'},
54: ['interface','username','domain','firsturl']);
55:
56: # ----------------------------------------------------------- Process Interface
57: $ENV{'form.interface'}=~s/\W//g;
58:
59: my $textbrowsers=$r->dir_config('lonTextBrowsers');
60: my $httpbrowser=$ENV{"HTTP_USER_AGENT"};
61:
62: foreach (split(/\:/,$textbrowsers)) {
63: if ($httpbrowser=~/$_/i) {
64: $ENV{'form.interface'}='textual';
65: }
66: }
67:
68: my $fullgraph=($ENV{'form.interface'} ne 'textual');
69: my $port_to_use=$r->dir_config('lonhttpdPort');
70: if (!defined($port_to_use)) {
71: $port_to_use='8080';
72: }
73: my $iconpath= 'http://'.$ENV{'HTTP_HOST'}.':'.$port_to_use.
74: $r->dir_config('lonIconsURL');
75: my $domain = $r->dir_config('lonDefDomain');
76: my $role = $r->dir_config('lonRole');
77: my $loadlim = $r->dir_config('lonLoadLim');
78: my $servadm = $r->dir_config('lonAdmEMail');
79: my $sysadm = $r->dir_config('lonSysEMail');
80: my $lonhost = $r->dir_config('lonHostID');
81: my $tabdir = $r->dir_config('lonTabDir');
82: my $include = $r->dir_config('lonIncludes');
83: my $expire = $r->dir_config('lonExpire');
84:
85: # --------------------------------------------- Default values for login fields
86:
87: my $authusername=($ENV{'form.username'}?$ENV{'form.username'}:'');
88: my $authdomain=($ENV{'form.domain'}?$ENV{'form.domain'}:$domain);
89:
90: # ---------------------------------------------------------- Determine own load
91: my $loadavg;
92: {
93: my $loadfile=Apache::File->new('/proc/loadavg');
94: $loadavg=<$loadfile>;
95: }
96: $loadavg =~ s/\s.*//g;
97: my $loadpercent=100*$loadavg/$loadlim;
98:
99: # ------------------------------------------------------- Do the load balancing
100: my $otherserver='http://'.$ENV{'SERVER_NAME'};
101: my $firsturl=
102: ($ENV{'request.firsturl'}?$ENV{'request.firsturl'}:$ENV{'form.firsturl'});
103: # ---------------------------------------- Are we access server and overloaded?
104: if (($role eq 'access') && ($loadpercent>100.0)) {
105: $otherserver=Apache::lonnet::spareserver($loadpercent);
106: }
107:
108: # -------------------------------------------------------- Set login parameters
109:
110: my @hexstr=('0','1','2','3','4','5','6','7',
111: '8','9','a','b','c','d','e','f');
112: my $lkey='';
113: for (0..7) {
114: $lkey.=$hexstr[rand(15)];
115: }
116:
117: my $ukey='';
118: for (0..7) {
119: $ukey.=$hexstr[rand(15)];
120: }
121:
122: my $lextkey=hex($lkey);
123: if ($lextkey>2147483647) { $lextkey-=4294967296; }
124:
125: my $uextkey=hex($ukey);
126: if ($uextkey>2147483647) { $uextkey-=4294967296; }
127:
128: # -------------------------------------------------------- Store away log token
129: my $logtoken=Apache::lonnet::reply(
130: 'tmpput:'.$ukey.$lkey.'&'.$firsturl,
131: $lonhost);
132:
133: # ------------------- If we cannot talk to ourselves, we are in serious trouble
134:
135: if ($logtoken eq 'con_lost') {
136: my $spares='';
137: foreach (keys %Apache::lonnet::hostname) {
138: if ($_ ne $lonhost) {
139: $spares.='<br /><a href="http://'.$Apache::lonnet::hostname{$_}.
140: '/adm/login?domain='.$authdomain.'">'.
141: $Apache::lonnet::hostname{$_}.'</a>';
142: if ($Apache::lonnet::spareid{$_}) {
143: $spares.=' (preferred)';
144: }
145: }
146: }
147: $r->print(<<ENDTROUBLE);
148: <html>
149: <head><title>The LearningOnline Network with CAPA</title></head>
150: <body bgcolor="#FFFFFF">
151: <img src="/adm/lonKaputt/lonlogo_broken.gif" align="right" />
152: <h3>This LON-CAPA server is temporarily not available for login</h3>
153: <p>Please attempt to login to one of the following servers:</p>$spares
154: <p>If the problem persists, please contact <tt>$servadm</tt>.</p>
155: </body>
156: </html>
157: ENDTROUBLE
158: return OK;
159: }
160:
161: # ----------------------------------------------- Apparently we are in business
162:
163: my $domainlogo=&Apache::loncommon::domainlogo();
164: $servadm=~s/\,/\<br \/\>/g;
165: $sysadm=~s/\,/\<br \/\>/g;
166:
167: # --------------------------------------------------- Print login screen header
168: $r->print(<<ENDHEADER);
169: <html>
170: <head>
171: <meta HTTP-EQUIV="Refresh" CONTENT="$expire; url=/adm/roles" />
172: <title>The LearningOnline Network with CAPA Login</title>
173: </head>
174: ENDHEADER
175: # ---------------------------------------------------- Serve out DES JavaScript
176: {
177: my $jsh=Apache::File->new($include."/londes.js");
178: $r->print(<$jsh>);
179: }
180:
181: # ----------------------------------------------------------- Front page design
182: my $pgbg=
183: ($fullgraph?&Apache::loncommon::designparm('login.pgbg'):'#FFFFFF');
184: my $font=
185: ($fullgraph?&Apache::loncommon::designparm('login.font'):'#000000');
186: my $link=
187: ($fullgraph?&Apache::loncommon::designparm('login.link'):'#0000FF');
188: my $vlink=
189: ($fullgraph?&Apache::loncommon::designparm('login.vlink'):'#0000FF');
190: my $alink=&Apache::loncommon::designparm('login.alink');
191: my $mainbg=
192: ($fullgraph?&Apache::loncommon::designparm('login.mainbg'):'#FFFFFF');
193: my $sidebg=
194: ($fullgraph?&Apache::loncommon::designparm('login.sidebg'):'#FFFFFF');
195: my $logo=&Apache::loncommon::designparm('login.logo');
196: my $img=&Apache::loncommon::designparm('login.img');
197:
198:
199: # ---------------------------------------------------------- Serve rest of page
200: $r->print(<<ENDSCRIPT);
201:
202: <body bgcolor="$pgbg" text="$font" link="$link" vlink="$vlink" alink="$alink"
203: topmargin=0 leftmargin=0 marginwidth=0 marginheight=0>
204:
205: <script language="JavaScript">
206: function send()
207: {
208: this.document.server.elements.uname.value
209: =this.document.client.elements.uname.value;
210:
211: this.document.server.elements.udom.value
212: =this.document.client.elements.udom.value;
213:
214: this.document.server.elements.imagesuppress.value
215: =this.document.client.elements.imagesuppress.checked;
216:
217: this.document.server.elements.embedsuppress.value
218: =this.document.client.elements.embedsuppress.checked;
219:
220: this.document.server.elements.appletsuppress.value
221: =this.document.client.elements.appletsuppress.checked;
222:
223: this.document.server.elements.fontenhance.value
224: =this.document.client.elements.fontenhance.checked;
225:
226: this.document.server.elements.blackwhite.value
227: =this.document.client.elements.blackwhite.checked;
228:
229: this.document.server.elements.remember.value
230: =this.document.client.elements.remember.checked;
231:
232: uextkey=this.document.client.elements.uextkey.value;
233: lextkey=this.document.client.elements.lextkey.value;
234: initkeys();
235:
236: this.document.server.elements.upass.value
237: =crypted(this.document.client.elements.upass.value);
238:
239: this.document.server.submit();
240: return false;
241: }
242: </script>
243: ENDSCRIPT
244:
245: if ($fullgraph) {
246: $r->print(
247: '<table width="100%" cellpadding=0 cellspacing=0 border=0>');
248: }
249:
250: $r->print(<<ENDSERVERFORM);
251: <form name="server" action="$otherserver/adm/authenticate" method="post" target="_top">
252: <input type="hidden" name="logtoken" value="$logtoken" />
253: <input type="hidden" name="serverid" value="$lonhost" />
254: <input type="hidden" name="interface" value="$ENV{'form.interface'}" />
255: <input type="hidden" name="uname" value="" />
256: <input type="hidden" name="upass" value="" />
257: <input type="hidden" name="udom" value="" />
258: <input type="hidden" name="imagesuppress" value="" />
259: <input type="hidden" name="appletsuppress" value="" />
260: <input type="hidden" name="embedsuppress" value="" />
261: <input type="hidden" name="fontenhance" value="" />
262: <input type="hidden" name="blackwhite" value="" />
263: <input type="hidden" name="remember" value="" />
264: </form>
265: ENDSERVERFORM
266: if ($fullgraph) { $r->print(<<ENDTOP);
267: <!-- The LON-CAPA Header -->
268: <tr>
269:
270: <!-- Row 1 Columns 2-4 -->
271: <td width="100%" height=75 colspan=4 align="left" valign="top" bgcolor="$pgbg"><img src="$img" border=0 alt="The Learning Online Network with CAPA" /></td>
272: </tr>
273:
274: <!-- The gray bar that starts the two table frames -->
275: <tr>
276:
277: <!-- Row 2 Column 1 -->
278: <td width=182 height=27 bgcolor="$sidebg"> </td>
279:
280: <!-- Row 2 Column 2 -->
281: <td width=27 height=27 align="left" background="$iconpath/filltop.gif"><img src="$iconpath/upperleft.gif" border=0 alt="" /></td>
282:
283: <!-- Row 2 Column 3 -->
284: <td height=27 background="$iconpath/filltop.gif"><img src="$iconpath/filltop.gif" alt="" /></td>
285:
286: <!-- Row 2 Column 4 -->
287: <td width=27 height=27 align="right" background="$iconpath/filltop.gif"><img src="$iconpath/upperright.gif" border=0 alt="" /></td>
288: </tr>
289: <tr>
290:
291: <!-- A cell that will hold the 'access' and 'about' buttons -->
292: <!-- Row 3 Column 1 -->
293: <td valign="top" height=60 align="center" bgcolor="$sidebg">
294: <a href="/adm/login?interface=textual"><img src="$iconpath/accessbutton.gif" border=0 alt="Accessibility Options" /></a>
295: <br />
296: <a href="/adm/about.html"><img src="$iconpath/aboutlon.gif" border=0 alt="About LON-CAPA" /></a>
297: </td>
298:
299: <!-- The shaded space between the two main columns -->
300: <!-- Row 3 Column 2 -->
301: <td width=27 height=60 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
302:
303: <!-- The right main column holding the large LON-CAPA logo-->
304: <!-- Rows 3-4 Column 3 -->
305: <td align="center" valign="top" width="100%" height="100%" rowspan=2 bgcolor="$mainbg">
306: <center>
307: <img src="$logo" alt="" />
308: </center>
309: </td>
310:
311: <!-- Row 3 Column 4 -->
312: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
313: </tr>
314: <tr>
315:
316: <!-- The entry form -->
317: <!-- Row 4 Column 1 -->
318: <td align="center" valign="middle" bgcolor="$sidebg">
319: ENDTOP
320: } else {
321: $r->print('<h1>The Learning<i>Online</i> Network with CAPA</h1><h2>Text-based Interface Login</h2>');
322: }
323: $r->print('<form name="client" onsubmit="return(send())">');
324: unless ($fullgraph) {
325: $r->print(<<ENDACCESSOPTIONS);
326: <h3>Select Accessibility Options</h3>
327: <input type="checkbox" name="imagesuppress" /> Suppress rendering of images<br />
328: <input type="checkbox" name="appletsuppress" /> Suppress Java applets<br />
329: <input type="checkbox" name="embedsuppress" /> Suppress rendering of embedded multimedia<br />
330: <input type="checkbox" name="fontenhance" /> Increase font size<br />
331: <input type="checkbox" name="blackwhite" /> Switch to black and white mode<br />
332: <p>If you have accessibility needs that are not addressed by this interface,
333: please
334: contact the system administrator at <tt>$sysadm</tt>.</p><br />
335: <input type="checkbox" name="remember" /> Remember these settings for next login<hr />
336: ENDACCESSOPTIONS
337: } else {
338: $r->print(<<ENDNOOPT);
339: <input type="hidden" name="imagesuppress" value="" />
340: <input type="hidden" name="embedsuppress" value="" />
341: <input type="hidden" name="appletsuppress" value="" />
342: <input type="hidden" name="fontenhance" value="" />
343: <input type="hidden" name="blackwhite" value="" />
344: <input type="hidden" name="remember" value="" />
345: ENDNOOPT
346: }
347: $r->print(<<ENDLOGIN);
348: <input type="hidden" name="lextkey" value="$lextkey">
349: <input type="hidden" name="uextkey" value="$uextkey">
350:
351: <!-- Start the sub-table for text and input alignment -->
352: <table border=0 cellspacing=0 cellpadding=0>
353: <tr><td bgcolor="$sidebg" colspan=2><img src="$iconpath/userauthentication.gif" alt="User Authentication" /></td></tr>
354: <tr>
355: <td bgcolor="$mainbg"><br /><font size=-1><b> User Name:</b></font></td>
356: <td bgcolor="$mainbg"><br /><input type="text" name="uname" size="10" value="$authusername" /></td>
357: </tr>
358: <tr>
359: <td bgcolor="$mainbg"><font size=-1><b> Password:</b></font></td>
360: <td bgcolor="$mainbg"><input type="password" name="upass" size="10" /></td>
361: </tr>
362: <tr>
363: <td bgcolor="$mainbg"><font size=-1><b> Domain:</b></font></td>
364: <td bgcolor="$mainbg"><input type="text" name="udom" size="10" value="$authdomain" /></td>
365: </tr>
366: <tr>
367: <td bgcolor="$mainbg"> <a href="/adm/loginproblems.html">Help</a></td>
368: <td bgcolor="$mainbg" valign="bottom" align="center">
369: <br />
370: <input type="submit" value="Log In" />
371: </td>
372: </tr>
373: </table>
374: <!-- End sub-table -->
375: </form>
376: ENDLOGIN
377: if ($fullgraph) {
378: $r->print(<<ENDDOCUMENT);
379: </td>
380:
381: <!-- Row 4 Column 2 -->
382: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
383:
384: <!-- Row 4 Column 4 -->
385: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
386: </tr>
387: <tr>
388:
389: <!-- Row 5 Column 1 -->
390: <td bgcolor="$sidebg" valign="middle" align="left">
391: <br />
392: <table border=0 cellspacing=0 cellpadding=0>
393: <tr>
394: <td bgcolor="$sidebg" align="left" valign="top">
395: <small><b> Domain: </b></small>
396: </td>
397: <td bgcolor="$sidebg" align="left" valign="top">
398: <small><tt> $domain</tt></small>
399: </td>
400: </tr>
401: <tr>
402: <td bgcolor="$sidebg" align="left" valign="top">
403: <small><b> Server: </b></small>
404: </td>
405: <td bgcolor="$sidebg" align="left" valign="top">
406: <small><tt> $lonhost ($role)</tt></small>
407: </td>
408: </tr>
409: <tr>
410: <td bgcolor="$sidebg" align="left" valign="top">
411: <small><b> Load: </b></small>
412: </td>
413: <td bgcolor="$sidebg" align="left" valign="top">
414: <small><tt> $loadpercent percent</tt></small>
415: </td>
416: </tr>
417: </table>
418: <br />
419: <small>
420: <b> System Administration:</b><br />
421: <tt> $sysadm</tt><br />
422: <b> Server Administration:</b><br />
423: <tt> $servadm<br /> </tt>
424: </small>
425: </td>
426:
427: <!-- Row 5 Column 2 -->
428: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
429:
430: <!-- Row 5 Column 3 -->
431: <td width="100%" valign="bottom" bgcolor="$mainbg">
432: $domainlogo
433: </td>
434:
435: <!-- Row 5 Column 4 -->
436: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
437: </tr>
438: <tr>
439:
440: <!-- Row 6 Column 1 -->
441: <td bgcolor="$sidebg"> </td>
442:
443: <!-- Row 6 Column 2 -->
444: <td align="left" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerleft.gif" alt="" /></td>
445:
446: <!-- Row 6 Column 3 -->
447: <td background="$iconpath/fillbottom.gif"><img src="$iconpath/fillbottom.gif" alt="" /></td>
448:
449: <!-- Row 6 Column 4 -->
450: <td align="right" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerright.gif" alt="" /></td>
451: </tr>
452: </table>
453:
454: <script>
455: // the if prevents the script error if the browser can't handle this
456: if ( document.client.uname ) { document.client.uname.focus(); }
457: </script>
458:
459: ENDDOCUMENT
460: }
461: $r->print('</body></html>');
462: return OK;
463: }
464:
465: 1;
466: __END__
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