1: # The LearningOnline Network
2: # Login Screen
3: #
4: # $Id: lonlogin.pm,v 1.48 2003/09/02 22:28:19 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','localpath','localres']);
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 = $r->dir_config('lonDefDomain');
76: if (($ENV{'form.domain'}) &&
77: ($Apache::lonnet::domaindescription{$ENV{'form.domain'}})) {
78: $domain=$ENV{'form.domain'};
79: }
80: my $role = $r->dir_config('lonRole');
81: my $loadlim = $r->dir_config('lonLoadLim');
82: my $servadm = $r->dir_config('lonAdmEMail');
83: my $sysadm = $r->dir_config('lonSysEMail');
84: my $lonhost = $r->dir_config('lonHostID');
85: my $tabdir = $r->dir_config('lonTabDir');
86: my $include = $r->dir_config('lonIncludes');
87: my $expire = $r->dir_config('lonExpire');
88: my $version = $r->dir_config('lonVersion');
89:
90: # --------------------------------------------- Default values for login fields
91:
92: my $authusername=($ENV{'form.username'}?$ENV{'form.username'}:'');
93: my $authdomain=($ENV{'form.domain'}?$ENV{'form.domain'}:$domain);
94:
95: # ---------------------------------------------------------- Determine own load
96: my $loadavg;
97: {
98: my $loadfile=Apache::File->new('/proc/loadavg');
99: $loadavg=<$loadfile>;
100: }
101: $loadavg =~ s/\s.*//g;
102: my $loadpercent=100*$loadavg/$loadlim;
103: my $userloadpercent=&Apache::lonnet::userload();
104:
105: # ------------------------------------------------------- Do the load balancing
106: my $otherserver='http://'.$ENV{'SERVER_NAME'};
107: my $firsturl=
108: ($ENV{'request.firsturl'}?$ENV{'request.firsturl'}:$ENV{'form.firsturl'});
109: # ---------------------------------------- Are we access server and overloaded?
110: if (($role eq 'access') &&
111: (($userloadpercent>100.0)||($loadpercent>100.0))) {
112: my $unloaded=Apache::lonnet::spareserver($loadpercent,$userloadpercent);
113: if ($unloaded) { $otherserver=$unloaded; }
114: }
115:
116: # ----------------------------------------------------------- Get announcements
117: my $announcements=&Apache::lonnet::getannounce();
118: # -------------------------------------------------------- Set login parameters
119:
120: my @hexstr=('0','1','2','3','4','5','6','7',
121: '8','9','a','b','c','d','e','f');
122: my $lkey='';
123: for (0..7) {
124: $lkey.=$hexstr[rand(15)];
125: }
126:
127: my $ukey='';
128: for (0..7) {
129: $ukey.=$hexstr[rand(15)];
130: }
131:
132: my $lextkey=hex($lkey);
133: if ($lextkey>2147483647) { $lextkey-=4294967296; }
134:
135: my $uextkey=hex($ukey);
136: if ($uextkey>2147483647) { $uextkey-=4294967296; }
137:
138: # -------------------------------------------------------- Store away log token
139: my $logtoken=Apache::lonnet::reply(
140: 'tmpput:'.$ukey.$lkey.'&'.$firsturl,
141: $lonhost);
142:
143: # ------------------- If we cannot talk to ourselves, we are in serious trouble
144:
145: if ($logtoken eq 'con_lost') {
146: my $spares='';
147: foreach (keys %Apache::lonnet::hostname) {
148: if ($_ ne $lonhost) {
149: $spares.='<br /><a href="http://'.$Apache::lonnet::hostname{$_}.
150: '/adm/login?domain='.$authdomain.'">'.
151: $Apache::lonnet::hostname{$_}.'</a>';
152: if ($Apache::lonnet::spareid{$_}) {
153: $spares.=' (preferred)';
154: }
155: }
156: }
157: $r->print(<<ENDTROUBLE);
158: <html>
159: <head><title>The LearningOnline Network with CAPA</title></head>
160: <body bgcolor="#FFFFFF">
161: <img src="/adm/lonKaputt/lonlogo_broken.gif" align="right" />
162: <h3>This LON-CAPA server is temporarily not available for login</h3>
163: <p>Please attempt to login to one of the following servers:</p>$spares
164: <p>If the problem persists, please contact <tt>$servadm</tt>.</p>
165: </body>
166: </html>
167: ENDTROUBLE
168: return OK;
169: }
170:
171: # ----------------------------------------------- Apparently we are in business
172:
173: my $domainlogo=&Apache::loncommon::domainlogo($domain);
174: $servadm=~s/\,/\<br \/\>/g;
175: $sysadm=~s/\,/\<br \/\>/g;
176:
177: # --------------------------------------------------- Print login screen header
178: $r->print(<<ENDHEADER);
179: <html>
180: <head>
181: <meta HTTP-EQUIV="Refresh" CONTENT="$expire; url=/adm/roles" />
182: <title>The LearningOnline Network with CAPA Login</title>
183: </head>
184: ENDHEADER
185: # ---------------------------------------------------- Serve out DES JavaScript
186: {
187: my $jsh=Apache::File->new($include."/londes.js");
188: $r->print(<$jsh>);
189: }
190:
191: # ----------------------------------------------------------- Front page design
192: my $pgbg=
193: ($fullgraph?&Apache::loncommon::designparm('login.pgbg',$domain):'#FFFFFF');
194: my $font=
195: ($fullgraph?&Apache::loncommon::designparm('login.font',$domain):'#000000');
196: my $link=
197: ($fullgraph?&Apache::loncommon::designparm('login.link',$domain):'#0000FF');
198: my $vlink=
199: ($fullgraph?&Apache::loncommon::designparm('login.vlink',$domain):'#0000FF');
200: my $alink=&Apache::loncommon::designparm('login.alink',$domain);
201: my $mainbg=
202: ($fullgraph?&Apache::loncommon::designparm('login.mainbg',$domain):'#FFFFFF');
203: my $sidebg=
204: ($fullgraph?&Apache::loncommon::designparm('login.sidebg',$domain):'#FFFFFF');
205: my $logo=&Apache::loncommon::designparm('login.logo',$domain);
206: my $img=&Apache::loncommon::designparm('login.img',$domain);
207:
208:
209: # ---------------------------------------------------------- Serve rest of page
210: $r->print(<<ENDSCRIPT);
211:
212: <body bgcolor="$pgbg" text="$font" link="$link" vlink="$vlink" alink="$alink"
213: topmargin=0 leftmargin=0 marginwidth=0 marginheight=0>
214:
215: <script language="JavaScript">
216: function send()
217: {
218: this.document.server.elements.uname.value
219: =this.document.client.elements.uname.value;
220:
221: this.document.server.elements.udom.value
222: =this.document.client.elements.udom.value;
223:
224: this.document.server.elements.imagesuppress.value
225: =this.document.client.elements.imagesuppress.checked;
226:
227: this.document.server.elements.embedsuppress.value
228: =this.document.client.elements.embedsuppress.checked;
229:
230: this.document.server.elements.appletsuppress.value
231: =this.document.client.elements.appletsuppress.checked;
232:
233: this.document.server.elements.fontenhance.value
234: =this.document.client.elements.fontenhance.checked;
235:
236: this.document.server.elements.blackwhite.value
237: =this.document.client.elements.blackwhite.checked;
238:
239: this.document.server.elements.remember.value
240: =this.document.client.elements.remember.checked;
241:
242: uextkey=this.document.client.elements.uextkey.value;
243: lextkey=this.document.client.elements.lextkey.value;
244: initkeys();
245:
246: this.document.server.elements.upass.value
247: =crypted(this.document.client.elements.upass.value);
248:
249: this.document.server.submit();
250: return false;
251: }
252: </script>
253: ENDSCRIPT
254:
255: if ($fullgraph) {
256: $r->print(
257: '<table width="100%" cellpadding=0 cellspacing=0 border=0>');
258: }
259:
260: $r->print(<<ENDSERVERFORM);
261: <form name="server" action="$otherserver/adm/authenticate" method="post" target="_top">
262: <input type="hidden" name="logtoken" value="$logtoken" />
263: <input type="hidden" name="serverid" value="$lonhost" />
264: <input type="hidden" name="interface" value="$ENV{'form.interface'}" />
265: <input type="hidden" name="uname" value="" />
266: <input type="hidden" name="upass" value="" />
267: <input type="hidden" name="udom" value="" />
268: <input type="hidden" name="imagesuppress" value="" />
269: <input type="hidden" name="appletsuppress" value="" />
270: <input type="hidden" name="embedsuppress" value="" />
271: <input type="hidden" name="fontenhance" value="" />
272: <input type="hidden" name="blackwhite" value="" />
273: <input type="hidden" name="remember" value="" />
274: <input type="hidden" name="localpath" value="$ENV{'form.localpath'}" />
275: <input type="hidden" name="localres" value="$ENV{'form.localres'}" />
276: </form>
277: ENDSERVERFORM
278: if ($fullgraph) { $r->print(<<ENDTOP);
279: <!-- The LON-CAPA Header -->
280: <tr>
281:
282: <!-- Row 1 Columns 2-4 -->
283: <td width="100%" height=75 colspan=4 align="left" valign="top" bgcolor="$pgbg"><img src="$img" border=0 alt="The Learning Online Network with CAPA" /></td>
284: </tr>
285:
286: <!-- The gray bar that starts the two table frames -->
287: <tr>
288:
289: <!-- Row 2 Column 1 -->
290: <td width=182 height=27 bgcolor="$sidebg"> </td>
291:
292: <!-- Row 2 Column 2 -->
293: <td width=27 height=27 align="left" background="$iconpath/filltop.gif"><img src="$iconpath/upperleft.gif" border=0 alt="" /></td>
294:
295: <!-- Row 2 Column 3 -->
296: <td height=27 background="$iconpath/filltop.gif"><img src="$iconpath/filltop.gif" alt="" /></td>
297:
298: <!-- Row 2 Column 4 -->
299: <td width=27 height=27 align="right" background="$iconpath/filltop.gif"><img src="$iconpath/upperright.gif" border=0 alt="" /></td>
300: </tr>
301: <tr>
302:
303: <!-- A cell that will hold the 'access' and 'about' buttons -->
304: <!-- Row 3 Column 1 -->
305: <td valign="top" height=60 align="center" bgcolor="$sidebg">
306: <a href="/adm/login?interface=textual"><img src="$iconpath/accessbutton.gif" border=0 alt="Accessibility Options" /></a>
307: <br />
308: <a href="/adm/about.html"><img src="$iconpath/aboutlon.gif" border=0 alt="About LON-CAPA" /></a>
309: </td>
310:
311: <!-- The shaded space between the two main columns -->
312: <!-- Row 3 Column 2 -->
313: <td width=27 height=60 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
314:
315: <!-- The right main column holding the large LON-CAPA logo-->
316: <!-- Rows 3-4 Column 3 -->
317: <td align="center" valign="top" width="100%" height="100%" bgcolor="$mainbg">
318: <center>
319: <img src="$logo" alt="" />
320: </center>
321: </td>
322:
323: <!-- Row 3 Column 4 -->
324: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
325: </tr>
326: <tr>
327:
328: <!-- The entry form -->
329: <!-- Row 4 Column 1 -->
330: <td align="center" valign="middle" bgcolor="$sidebg">
331: ENDTOP
332: } else {
333: $r->print('<h1>The Learning<i>Online</i> Network with CAPA</h1><h2>Text-based Interface Login</h2>'.$announcements);
334: }
335: $r->print('<form name="client" onsubmit="return(send())">');
336: unless ($fullgraph) {
337: $r->print(<<ENDACCESSOPTIONS);
338: <h3>Select Accessibility Options</h3>
339: <input type="checkbox" name="imagesuppress" /> Suppress rendering of images<br />
340: <input type="checkbox" name="appletsuppress" /> Suppress Java applets<br />
341: <input type="checkbox" name="embedsuppress" /> Suppress rendering of embedded multimedia<br />
342: <input type="checkbox" name="fontenhance" /> Increase font size<br />
343: <input type="checkbox" name="blackwhite" /> Switch to black and white mode<br />
344: <p>If you have accessibility needs that are not addressed by this interface,
345: please
346: contact the system administrator at <tt>$sysadm</tt>.</p><br />
347: <input type="checkbox" name="remember" /> Remember these settings for next login<hr />
348: ENDACCESSOPTIONS
349: } else {
350: $r->print(<<ENDNOOPT);
351: <input type="hidden" name="imagesuppress" value="" />
352: <input type="hidden" name="embedsuppress" value="" />
353: <input type="hidden" name="appletsuppress" value="" />
354: <input type="hidden" name="fontenhance" value="" />
355: <input type="hidden" name="blackwhite" value="" />
356: <input type="hidden" name="remember" value="" />
357: ENDNOOPT
358: }
359: $r->print(<<ENDLOGIN);
360: <input type="hidden" name="lextkey" value="$lextkey">
361: <input type="hidden" name="uextkey" value="$uextkey">
362:
363: <!-- Start the sub-table for text and input alignment -->
364: <table border=0 cellspacing=0 cellpadding=0>
365: <tr><td bgcolor="$sidebg" colspan=2><img src="$iconpath/userauthentication.gif" alt="User Authentication" /></td></tr>
366: <tr>
367: <td bgcolor="$mainbg"><br /><font size=-1><b> User Name:</b></font></td>
368: <td bgcolor="$mainbg"><br /><input type="text" name="uname" size="10" value="$authusername" /></td>
369: </tr>
370: <tr>
371: <td bgcolor="$mainbg"><font size=-1><b> Password:</b></font></td>
372: <td bgcolor="$mainbg"><input type="password" name="upass" size="10" /></td>
373: </tr>
374: <tr>
375: <td bgcolor="$mainbg"><font size=-1><b> Domain:</b></font></td>
376: <td bgcolor="$mainbg"><input type="text" name="udom" size="10" value="$authdomain" /></td>
377: </tr>
378: <tr>
379: <td bgcolor="$mainbg"> <a href="/adm/loginproblems.html">Help</a></td>
380: <td bgcolor="$mainbg" valign="bottom" align="center">
381: <br />
382: <input type="submit" value="Log In" />
383: </td>
384: </tr>
385: </table>
386: <!-- End sub-table -->
387: </form>
388: ENDLOGIN
389: if ($fullgraph) {
390: $r->print(<<ENDDOCUMENT);
391: </td>
392:
393: <!-- Row 4 Column 2 -->
394: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
395:
396: <!-- Row 4 Column 3 -->
397: <td bgcolor="$mainbg">$announcements</td>
398:
399: <!-- Row 4 Column 4 -->
400: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
401: </tr>
402: <tr>
403:
404: <!-- Row 5 Column 1 -->
405: <td bgcolor="$sidebg" valign="middle" align="left">
406: <br />
407: <table border=0 cellspacing=0 cellpadding=0>
408: <tr>
409: <td bgcolor="$sidebg" align="left" valign="top">
410: <small><b> Domain: </b></small>
411: </td>
412: <td bgcolor="$sidebg" align="left" valign="top">
413: <small><tt> $domain</tt></small>
414: </td>
415: </tr>
416: <tr>
417: <td bgcolor="$sidebg" align="left" valign="top">
418: <small><b> Server: </b></small>
419: </td>
420: <td bgcolor="$sidebg" align="left" valign="top">
421: <small><tt> $lonhost ($role)</tt></small>
422: </td>
423: </tr>
424: <tr>
425: <td bgcolor="$sidebg" align="left" valign="top">
426: <small><b> Load: </b></small>
427: </td>
428: <td bgcolor="$sidebg" align="left" valign="top">
429: <small><tt> $loadpercent percent</tt></small>
430: </td>
431: </tr>
432: <tr>
433: <td bgcolor="$sidebg" align="left" valign="top">
434: <small><b> User Load: </b></small>
435: </td>
436: <td bgcolor="$sidebg" align="left" valign="top">
437: <small><tt> $userloadpercent percent</tt></small>
438: </td>
439: </tr>
440: </table>
441: <br />
442: <small>
443: <b> System Administration:</b><br />
444: <tt> $sysadm</tt><br />
445: <b> Server Administration:</b><br />
446: <tt> $servadm</tt><br /> <br />
447: $version
448: </small>
449: </td>
450:
451: <!-- Row 5 Column 2 -->
452: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
453:
454: <!-- Row 5 Column 3 -->
455: <td width="100%" valign="bottom" bgcolor="$mainbg">
456: $domainlogo
457: </td>
458:
459: <!-- Row 5 Column 4 -->
460: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
461: </tr>
462: <tr>
463:
464: <!-- Row 6 Column 1 -->
465: <td bgcolor="$sidebg"> </td>
466:
467: <!-- Row 6 Column 2 -->
468: <td align="left" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerleft.gif" alt="" /></td>
469:
470: <!-- Row 6 Column 3 -->
471: <td background="$iconpath/fillbottom.gif"><img src="$iconpath/fillbottom.gif" alt="" /></td>
472:
473: <!-- Row 6 Column 4 -->
474: <td align="right" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerright.gif" alt="" /></td>
475: </tr>
476: </table>
477:
478: <script>
479: // the if prevents the script error if the browser can't handle this
480: if ( document.client.uname ) { document.client.uname.focus(); }
481: </script>
482:
483: ENDDOCUMENT
484: }
485: $r->print('</body></html>');
486: return OK;
487: }
488:
489: 1;
490: __END__
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