1: # The LearningOnline Network
2: # Login Screen
3: #
4: # $Id: lonlogin.pm,v 1.34 2003/02/18 21:11:17 www 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'},['interface','username','domain','firsturl']);
54:
55: # ----------------------------------------------------------- Process Interface
56: $ENV{'form.interface'}=~s/\W//g;
57:
58: my $textbrowsers=$r->dir_config('lonTextBrowsers');
59: my $httpbrowser=$ENV{"HTTP_USER_AGENT"};
60:
61: foreach (split(/\:/,$textbrowsers)) {
62: if ($httpbrowser=~/$_/i) {
63: $ENV{'form.interface'}='textual';
64: }
65: }
66:
67: my $fullgraph=($ENV{'form.interface'} ne 'textual');
68:
69: my $iconpath= 'http://'.$ENV{'HTTP_HOST'}.':8080'.
70: $r->dir_config('lonIconsURL');
71: my $domain = $r->dir_config('lonDefDomain');
72: my $role = $r->dir_config('lonRole');
73: my $loadlim = $r->dir_config('lonLoadLim');
74: my $servadm = $r->dir_config('lonAdmEMail');
75: my $sysadm = $r->dir_config('lonSysEMail');
76: my $lonhost = $r->dir_config('lonHostID');
77: my $tabdir = $r->dir_config('lonTabDir');
78: my $include = $r->dir_config('lonIncludes');
79:
80: # --------------------------------------------- Default values for login fields
81:
82: my $authusername=($ENV{'form.username'}?$ENV{'form.username'}:'');
83: my $authdomain=($ENV{'form.domain'}?$ENV{'form.domain'}:$domain);
84:
85: # ---------------------------------------------------------- Determine own load
86: my $loadavg;
87: {
88: my $loadfile=Apache::File->new('/proc/loadavg');
89: $loadavg=<$loadfile>;
90: }
91: $loadavg =~ s/\s.*//g;
92: my $loadpercent=100*$loadavg/$loadlim;
93:
94: # ------------------------------------------------------- Do the load balancing
95: my $otherserver='http://'.$ENV{'SERVER_NAME'};
96: my $firsturl=
97: ($ENV{'request.firsturl'}?$ENV{'request.firsturl'}:$ENV{'form.firsturl'});
98: # ---------------------------------------- Are we access server and overloaded?
99: if (($role eq 'access') && ($loadpercent>100.0)) {
100: $otherserver=Apache::lonnet::spareserver($loadpercent);
101: }
102:
103: # -------------------------------------------------------- Set login parameters
104:
105: my @hexstr=('0','1','2','3','4','5','6','7',
106: '8','9','a','b','c','d','e','f');
107: my $lkey='';
108: for (0..7) {
109: $lkey.=$hexstr[rand(15)];
110: }
111:
112: my $ukey='';
113: for (0..7) {
114: $ukey.=$hexstr[rand(15)];
115: }
116:
117: my $lextkey=hex($lkey);
118: if ($lextkey>2147483647) { $lextkey-=4294967296; }
119:
120: my $uextkey=hex($ukey);
121: if ($uextkey>2147483647) { $uextkey-=4294967296; }
122:
123: # -------------------------------------------------------- Store away log token
124: my $logtoken=Apache::lonnet::reply(
125: 'tmpput:'.$ukey.$lkey.'&'.$firsturl,
126: $lonhost);
127:
128: # ------------------- If we cannot talk to ourselves, we are in serious trouble
129:
130: if ($logtoken eq 'con_lost') {
131: my $spares='';
132: foreach (keys %Apache::lonnet::hostname) {
133: if ($_ ne $lonhost) {
134: $spares.='<br /><a href="http://'.$Apache::lonnet::hostname{$_}.
135: '/adm/login?domain='.$authdomain.'">'.
136: $Apache::lonnet::hostname{$_}.'</a>';
137: if ($Apache::lonnet::spareid{$_}) {
138: $spares.=' (preferred)';
139: }
140: }
141: }
142: $r->print(<<ENDTROUBLE);
143: <html>
144: <head><title>The LearningOnline Network with CAPA</title></head>
145: <body bgcolor="#FFFFFF">
146: <img src="/adm/lonKaputt/lonlogo_broken.gif" align="right" />
147: <h3>This LON-CAPA server is temporarily not available for login</h3>
148: <p>Please attempt to login to one of the following servers:</p>$spares
149: <p>If the problem persists, please contact <tt>$servadm</tt>.</p>
150: </body>
151: </html>
152: ENDTROUBLE
153: return OK;
154: }
155:
156: # ----------------------------------------------- Apparently we are in business
157:
158: my $domainlogo=&Apache::loncommon::domainlogo();
159: # --------------------------------------------------- Print login screen header
160: $r->print(<<ENDHEADER);
161: <html>
162: <head>
163: <title>The LearningOnline Network with CAPA Login</title>
164: </head>
165: ENDHEADER
166: # ---------------------------------------------------- Serve out DES JavaScript
167: {
168: my $jsh=Apache::File->new($include."/londes.js");
169: $r->print(<$jsh>);
170: }
171:
172: # ----------------------------------------------------------- Front page design
173: my $pgbg=&Apache::loncommon::designparm('login.pgbg');
174: my $font=&Apache::loncommon::designparm('login.font');
175: my $link=&Apache::loncommon::designparm('login.link');
176: my $vlink=&Apache::loncommon::designparm('login.vlink');
177: my $alink=&Apache::loncommon::designparm('login.alink');
178: my $mainbg=&Apache::loncommon::designparm('login.mainbg');
179: my $sidebg=&Apache::loncommon::designparm('login.sidebg');
180: my $logo=&Apache::loncommon::designparm('login.logo');
181: my $img=&Apache::loncommon::designparm('login.img');
182:
183:
184: # ---------------------------------------------------------- Serve rest of page
185: $r->print(<<ENDSCRIPT);
186:
187: <body bgcolor="$pgbg" text="$font" link="$link" vlink="$vlink" alink="$alink"
188: topmargin=0 leftmargin=0 marginwidth=0 marginheight=0>
189:
190: <script language="JavaScript">
191: function send()
192: {
193: this.document.server.elements.uname.value
194: =this.document.client.elements.uname.value;
195:
196: this.document.server.elements.udom.value
197: =this.document.client.elements.udom.value;
198:
199: this.document.server.elements.imagesuppress.value
200: =this.document.client.elements.imagesuppress.value;
201:
202: this.document.server.elements.embedsuppress.value
203: =this.document.client.elements.embedsuppress.value;
204:
205: this.document.server.elements.appletsuppress.value
206: =this.document.client.elements.appletsuppress.value;
207:
208: this.document.server.elements.fontenhance.value
209: =this.document.client.elements.fontenhance.value;
210:
211: this.document.server.elements.blackwhite.value
212: =this.document.client.elements.blackwhite.value;
213:
214: uextkey=this.document.client.elements.uextkey.value;
215: lextkey=this.document.client.elements.lextkey.value;
216: initkeys();
217:
218: this.document.server.elements.upass.value
219: =crypted(this.document.client.elements.upass.value);
220:
221: this.document.server.submit();
222: return false;
223: }
224: </script>
225: ENDSCRIPT
226:
227: if ($fullgraph) {
228: $r->print(
229: '<table width="100%" cellpadding=0 cellspacing=0 border=0>');
230: }
231:
232: $r->print(<<ENDSERVERFORM);
233: <form name="server" action="$otherserver/adm/authenticate" method="post" target="_top">
234: <input type="hidden" name="logtoken" value="$logtoken" />
235: <input type="hidden" name="serverid" value="$lonhost" />
236: <input type="hidden" name="interface" value="$ENV{'form.interface'}" />
237: <input type="hidden" name="uname" value="" />
238: <input type="hidden" name="upass" value="" />
239: <input type="hidden" name="udom" value="" />
240: <input type="hidden" name="imagesuppress" value="" />
241: <input type="hidden" name="appletsuppress" value="" />
242: <input type="hidden" name="embedsuppress" value="" />
243: <input type="hidden" name="fontenhance" value="" />
244: <input type="hidden" name="blackwhite" value="" />
245: </form>
246: ENDSERVERFORM
247: if ($fullgraph) { $r->print(<<ENDTOP);
248: <!-- The LON-CAPA Header -->
249: <tr>
250:
251: <!-- Row 1 Columns 2-4 -->
252: <td width="100%" height=75 colspan=4 align="left" valign="top" bgcolor="$pgbg"><img src="$img" border=0 alt="The Learning Online Network with CAPA" /></td>
253: </tr>
254:
255: <!-- The gray bar that starts the two table frames -->
256: <tr>
257:
258: <!-- Row 2 Column 1 -->
259: <td width=182 height=27 bgcolor="$sidebg"> </td>
260:
261: <!-- Row 2 Column 2 -->
262: <td width=27 height=27 align="left" background="$iconpath/filltop.gif"><img src="$iconpath/upperleft.gif" border=0 alt="" /></td>
263:
264: <!-- Row 2 Column 3 -->
265: <td height=27 background="$iconpath/filltop.gif"><img src="$iconpath/filltop.gif" alt="" /></td>
266:
267: <!-- Row 2 Column 4 -->
268: <td width=27 height=27 align="right" background="$iconpath/filltop.gif"><img src="$iconpath/upperright.gif" border=0 alt="" /></td>
269: </tr>
270: <tr>
271:
272: <!-- A cell that will hold the 'access' and 'about' buttons -->
273: <!-- Row 3 Column 1 -->
274: <td valign="top" height=60 align="center" bgcolor="$sidebg">
275: <a href="/adm/login?interface=textual"><img src="$iconpath/accessbutton.gif" border=0 alt="Accessibility Options" /></a>
276: <br />
277: <a href="/adm/about.html"><img src="$iconpath/aboutlon.gif" border=0 alt="About LON-CAPA" /></a>
278: </td>
279:
280: <!-- The shaded space between the two main columns -->
281: <!-- Row 3 Column 2 -->
282: <td width=27 height=60 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
283:
284: <!-- The right main column holding the large LON-CAPA logo-->
285: <!-- Rows 3-4 Column 3 -->
286: <td align="center" valign="top" width="100%" height="100%" rowspan=2 bgcolor="$mainbg">
287: <center>
288: <img src="$logo" alt="" />
289: </center>
290: </td>
291:
292: <!-- Row 3 Column 4 -->
293: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
294: </tr>
295: <tr>
296:
297: <!-- The entry form -->
298: <!-- Row 4 Column 1 -->
299: <td align="center" valign="middle" bgcolor="$sidebg">
300: ENDTOP
301: } else {
302: $r->print('<font color="#FFFFFF"><h1>The Learning<i>Online</i> Network with CAPA</h1><h1>Text-based Interface Login</h1></font>');
303: }
304: $r->print('<form name="client" onsubmit="return(send())">');
305: unless ($fullgraph) {
306: $r->print(<<ENDACCESSOPTIONS);
307: <table bgcolor="#AAAAAA" cellspacing="3" cellpadding="3">
308: <tr><th>Select Accessibility Options</th></tr>
309: <tr>
310: <td bgcolor="#FFFFFF">
311: <input type="checkbox" name="imagesuppress" /> Suppress rendering of images<br />
312: <input type="checkbox" name="appletsuppress" /> Suppress Java applets<br />
313: <input type="checkbox" name="embedsuppress" /> Suppress rendering of embedded multimedia<br />
314: <input type="checkbox" name="fontenhance" /> Increase font size<br />
315: <input type="checkbox" name="blackwhite" /> Switch to black and white mode<br /></td></tr></table>
316: ENDACCESSOPTIONS
317: } else {
318: $r->print(<<ENDNOOPT);
319: <input type="hidden" name="imagesuppress" value="" />
320: <input type="hidden" name="embedsuppress" value="" />
321: <input type="hidden" name="appletsuppress" value="" />
322: <input type="hidden" name="fontenhance" value="" />
323: <input type="hidden" name="blackwhite" value="" />
324: ENDNOOPT
325: }
326: $r->print(<<ENDLOGIN);
327: <input type="hidden" name="lextkey" value="$lextkey">
328: <input type="hidden" name="uextkey" value="$uextkey">
329:
330: <!-- Start the sub-table for text and input alignment -->
331: <table border=0 cellspacing=0 cellpadding=0>
332: <tr><td bgcolor="$sidebg" colspan=2><img src="$iconpath/userauthentication.gif" alt="User Authentication" /></td></tr>
333: <tr>
334: <td bgcolor="$mainbg"><br /><font size=-1><b> User Name:</b></font></td>
335: <td bgcolor="$mainbg"><br /><input type="text" name="uname" size="10" value="$authusername" /></td>
336: </tr>
337: <tr>
338: <td bgcolor="$mainbg"><font size=-1><b> Password:</b></font></td>
339: <td bgcolor="$mainbg"><input type="password" name="upass" size="10" /></td>
340: </tr>
341: <tr>
342: <td bgcolor="$mainbg"><font size=-1><b> Domain:</b></font></td>
343: <td bgcolor="$mainbg"><input type="text" name="udom" size="10" value="$authdomain" /></td>
344: </tr>
345: <tr>
346: <td bgcolor="$mainbg"> <a href="/adm/loginproblems.html">Help</a></td>
347: <td bgcolor="$mainbg" valign="bottom" align="center">
348: <br />
349: <input type="submit" value="Log In" />
350: </td>
351: </tr>
352: </table>
353: <!-- End sub-table -->
354: </form>
355: ENDLOGIN
356: if ($fullgraph) {
357: $r->print(<<ENDDOCUMENT);
358: </td>
359:
360: <!-- Row 4 Column 2 -->
361: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
362:
363: <!-- Row 4 Column 4 -->
364: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
365: </tr>
366: <tr>
367:
368: <!-- Row 5 Column 1 -->
369: <td bgcolor="$sidebg" valign="middle" align="left">
370: <br />
371: <table border=0 cellspacing=0 cellpadding=0>
372: <tr>
373: <td bgcolor="$sidebg" align="left" valign="top">
374: <small><b> Domain: </b></small>
375: </td>
376: <td bgcolor="$sidebg" align="left" valign="top">
377: <small><tt> $domain</tt></small>
378: </td>
379: </tr>
380: <tr>
381: <td bgcolor="$sidebg" align="left" valign="top">
382: <small><b> Server: </b></small>
383: </td>
384: <td bgcolor="$sidebg" align="left" valign="top">
385: <small><tt> $lonhost ($role)</tt></small>
386: </td>
387: </tr>
388: <tr>
389: <td bgcolor="$sidebg" align="left" valign="top">
390: <small><b> Load: </b></small>
391: </td>
392: <td bgcolor="$sidebg" align="left" valign="top">
393: <small><tt> $loadpercent percent</tt></small>
394: </td>
395: </tr>
396: </table>
397: <br />
398: <small>
399: <b> System Administration:</b><br />
400: <tt> $sysadm</tt><br />
401: <b> Server Administration:</b><br />
402: <tt> $servadm<br /> </tt>
403: </small>
404: </td>
405:
406: <!-- Row 5 Column 2 -->
407: <td width=27 background="$iconpath/fillleft.gif"><img src="$iconpath/fillleft.gif" alt="" /></td>
408:
409: <!-- Row 5 Column 3 -->
410: <td width="100%" valign="bottom" bgcolor="$mainbg">
411: $domainlogo
412: </td>
413:
414: <!-- Row 5 Column 4 -->
415: <td width=27 background="$iconpath/fillright.gif"><img src="$iconpath/fillright.gif" alt="" /></td>
416: </tr>
417: <tr>
418:
419: <!-- Row 6 Column 1 -->
420: <td bgcolor="$sidebg"> </td>
421:
422: <!-- Row 6 Column 2 -->
423: <td align="left" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerleft.gif" alt="" /></td>
424:
425: <!-- Row 6 Column 3 -->
426: <td background="$iconpath/fillbottom.gif"><img src="$iconpath/fillbottom.gif" alt="" /></td>
427:
428: <!-- Row 6 Column 4 -->
429: <td align="right" background="$iconpath/fillbottom.gif"><img src="$iconpath/lowerright.gif" alt="" /></td>
430: </tr>
431: </table>
432:
433: <script>
434: // the if prevents the script error if the browser can't handle this
435: if ( document.client.uname ) { document.client.uname.focus(); }
436: </script>
437:
438: ENDDOCUMENT
439: }
440: $r->print('</body></html>');
441: return OK;
442: }
443:
444: 1;
445: __END__
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