1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
4: # $Id: lonpage.pm,v 1.32 2002/03/06 15:00:55 matthew 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: # (TeX Content Handler
29: #
30: # YEAR=2000
31: # 05/29/00,05/30 Gerd Kortemeyer)
32: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
33: # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16,
34: # YEAR=2001
35: # 08/13/01,08/30,10/1 Gerd Kortemeyer
36: # 12/16 Scott Harrison
37: #
38: ###
39:
40: package Apache::lonpage;
41:
42: use strict;
43: use Apache::Constants qw(:common :http);
44: use Apache::lonnet();
45: use Apache::loncommon();
46: use Apache::lonxml();
47: use HTML::TokeParser;
48: use GDBM_File;
49:
50: # -------------------------------------------------------------- Module Globals
51: my %hash;
52: my @rows;
53:
54: # ------------------------------------------------------------------ Euclid gcd
55:
56: sub euclid {
57: my ($e,$f)=@_;
58: my $a; my $b; my $r;
59: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
60: while ($r!=0) {
61: $a=$b; $b=$r;
62: $r=$a%$b;
63: }
64: return $b;
65: }
66:
67: # ------------------------------------------------------------ Build page table
68:
69: sub tracetable {
70: my ($sofar,$rid,$beenhere)=@_;
71: my $further=$sofar;
72: unless ($beenhere=~/\&$rid\&/) {
73: $beenhere.=$rid.'&';
74:
75: if (defined($hash{'is_map_'.$rid})) {
76: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
77: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
78: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
79: $sofar=
80: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
81: '&'.$frid.'&');
82: $sofar++;
83: if ($hash{'src_'.$frid}) {
84: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
85: if (($brepriv eq '2') || ($brepriv eq 'F')) {
86: if (defined($rows[$sofar])) {
87: $rows[$sofar].='&'.$frid;
88: } else {
89: $rows[$sofar]=$frid;
90: }
91: }
92: }
93: }
94: } else {
95: $sofar++;
96: if ($hash{'src_'.$rid}) {
97: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
98: if (($brepriv eq '2') || ($brepriv eq 'F')) {
99: if (defined($rows[$sofar])) {
100: $rows[$sofar].='&'.$rid;
101: } else {
102: $rows[$sofar]=$rid;
103: }
104: }
105: }
106: }
107:
108: if (defined($hash{'to_'.$rid})) {
109: my $mincond=1;
110: my $next='';
111: foreach (split(/\,/,$hash{'to_'.$rid})) {
112: my $thiscond=
113: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
114: if ($thiscond>=$mincond) {
115: if ($next) {
116: $next.=','.$_.':'.$thiscond;
117: } else {
118: $next=$_.':'.$thiscond;
119: }
120: if ($thiscond>$mincond) { $mincond=$thiscond; }
121: }
122: }
123: foreach (split(/\,/,$next)) {
124: my ($linkid,$condval)=split(/\:/,$_);
125: if ($condval>=$mincond) {
126: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
127: if ($now>$further) { $further=$now; }
128: }
129: }
130:
131: }
132: }
133: return $further;
134: }
135:
136: # ================================================================ Main Handler
137:
138: sub handler {
139: my $r=shift;
140:
141: # ------------------------------------------- Set document type for header only
142:
143: if ($r->header_only) {
144: if ($ENV{'browser.mathml'}) {
145: $r->content_type('text/xml');
146: } else {
147: $r->content_type('text/html');
148: }
149: $r->send_http_header;
150: return OK;
151: }
152:
153: my $requrl=$r->uri;
154: # ----------------------------------------------------------------- Tie db file
155: if ($ENV{'request.course.fn'}) {
156: my $fn=$ENV{'request.course.fn'};
157: if (-e "$fn.db") {
158: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
159: # ------------------------------------------------------------------- Hash tied
160: my $firstres=$hash{'map_start_'.$requrl};
161: my $lastres=$hash{'map_finish_'.$requrl};
162: if (($firstres) && ($lastres)) {
163: # ----------------------------------------------------------------- Render page
164:
165: @rows=();
166:
167: &tracetable(0,$firstres,'&'.$lastres.'&');
168: if ($hash{'src_'.$lastres}) {
169: my $brepriv=
170: &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres});
171: if (($brepriv eq '2') || ($brepriv eq 'F')) {
172: $rows[$#rows+1]=''.$lastres;
173: }
174: }
175:
176: # ------------------------------------------------------------ Add to symb list
177:
178: my $i;
179: my %symbhash=();
180: for ($i=0;$i<=$#rows;$i++) {
181: if ($rows[$i]) {
182: my @colcont=split(/\&/,$rows[$i]);
183: foreach (@colcont) {
184: $symbhash{$hash{'src_'.$_}}='';
185: }
186: }
187: }
188: &Apache::lonnet::symblist($requrl,%symbhash);
189:
190: # ------------------------------------------------------------------ Page parms
191:
192: my $j;
193: my $lcm=1;
194: my $contents=0;
195: my $nforms=0;
196:
197: my %ssibody=();
198: my %ssibgcolor=();
199: my %ssitext=();
200: my %ssilink=();
201: my %ssivlink=();
202: my %ssialink=();
203:
204: my %metalink=();
205:
206: my %cellemb=();
207:
208: my $allscript='';
209: my $allmeta='';
210:
211: my $isxml=0;
212: my $xmlheader='';
213: my $xmlbody='';
214:
215: # --------------------------------------------- Get SSI output, post parameters
216:
217: for ($i=0;$i<=$#rows;$i++) {
218: if ($rows[$i]) {
219: $contents++;
220: my @colcont=split(/\&/,$rows[$i]);
221: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
222: foreach (@colcont) {
223: my $src=$hash{'src_'.$_};
224: $src=~/\.(\w+)$/;
225: $metalink{$_}=$src.'.meta';
226: $cellemb{$_}=Apache::loncommon::fileembstyle($1);
227: if ($cellemb{$_} eq 'ssi') {
228: # --------------------------------------------------------- This is an SSI cell
229: my $prefix=$_.'_';
230: my %posthash=('request.prefix' => $prefix);
231: if (($ENV{'form.'.$prefix.'submit'})
232: || ($ENV{'form.all_submit'})) {
233: foreach (keys %ENV) {
234: if ($_=~/^form.$prefix/) {
235: my $name=$_;
236: $name=~s/^form.$prefix//;
237: $posthash{$name}=$ENV{$_};
238: }
239: }
240: }
241: my $output=Apache::lonnet::ssi($src,%posthash);
242: my $parser=HTML::TokeParser->new(\$output);
243: my $token;
244: my $thisdir=$src;
245: my $bodydef=0;
246: my $thisxml=0;
247: my @rlinks=();
248: if ($output=~/\?xml/) {
249: $isxml=1;
250: $thisxml=1;
251: $output=~
252: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
253: $xmlheader=$1;
254: }
255: while ($token=$parser->get_token) {
256: if ($token->[0] eq 'S') {
257: if ($token->[1] eq 'a') {
258: if ($token->[2]->{'href'}) {
259: $rlinks[$#rlinks+1]=
260: $token->[2]->{'href'};
261: }
262: } elsif ($token->[1] eq 'img') {
263: $rlinks[$#rlinks+1]=
264: $token->[2]->{'src'};
265: } elsif ($token->[1] eq 'embed') {
266: $rlinks[$#rlinks+1]=
267: $token->[2]->{'src'};
268: } elsif ($token->[1] eq 'base') {
269: $thisdir=$token->[2]->{'href'};
270: } elsif ($token->[1] eq 'body') {
271: $bodydef=1;
272: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
273: $ssitext{$_}=$token->[2]->{'text'};
274: $ssilink{$_}=$token->[2]->{'link'};
275: $ssivlink{$_}=$token->[2]->{'vlink'};
276: $ssialink{$_}=$token->[2]->{'alink'};
277: if ($thisxml) {
278: $xmlbody=$token->[4];
279: }
280: } elsif ($token->[1] eq 'meta') {
281: if ($token->[4] !~ m:/>$:) {
282: $allmeta.="\n".$token->[4].'</meta>';
283: } else {
284: $allmeta.="\n".$token->[4];
285: }
286: } elsif (($token->[1] eq 'script') &&
287: ($bodydef==0)) {
288: $allscript.="\n\n"
289: .$parser->get_text('/script');
290: }
291: }
292: }
293: if ($output=~/\<body[^\>]*\>(.*)/si) {
294: $output=$1;
295: }
296: $output=~s/\<\/body\>.*//si;
297: if ($output=~/\<form/si) {
298: $nforms++;
299: $output=~s/\<form[^\>]*\>//gsi;
300: $output=~s/\<\/form[^\>]*\>//gsi;
301: $output=~
302: s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
303: }
304: $thisdir=~s/\/[^\/]*$//;
305: foreach (@rlinks) {
306: unless (($_=~/^http:\/\//i) ||
307: ($_=~/^\//) ||
308: ($_=~/^javascript:/i) ||
309: ($_=~/^mailto:/i) ||
310: ($_=~/^\#/)) {
311: my $newlocation=
312: &Apache::lonnet::hreflocation($thisdir,$_);
313: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
314: }
315: }
316: # -------------------------------------------------- Deal with Applet codebases
317: $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
318: $ssibody{$_}=$output;
319: # ---------------------------------------------------------------- End SSI cell
320: }
321: }
322: }
323: }
324: unless ($contents) {
325: $r->content_type('text/html');
326: $r->send_http_header;
327: $r->print('<html><body>Empty page.</body></html>');
328: } else {
329: # ------------------------------------------------------------------ Build page
330:
331: # ---------------------------------------------------------------- Send headers
332: if ($isxml) {
333: $r->content_type('text/xml');
334: $r->send_http_header;
335: $r->print($xmlheader);
336: } else {
337: $r->content_type('text/html');
338: $r->send_http_header;
339: $r->print('<html>');
340: }
341: # ------------------------------------------------------------------------ Head
342: $r->print("\n<head>\n".$allmeta);
343: $allscript=~
344: s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
345: if ($allscript) {
346: $r->print("\n<script language='JavaScript'>\n".
347: $allscript."\n</script>\n");
348: }
349: $r->print(&Apache::lonxml::registerurl(1,undef));
350: $r->print("\n</head>\n");
351: # ------------------------------------------------------------------ Start body
352: if ($isxml) {
353: $r->print($xmlbody);
354: } else {
355: $r->print(
356: '<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonxml::loadevents.
357: '" onUnload="'.&Apache::lonxml::unloadevents.'">');
358: }
359: # ------------------------------------------------------------------ Start form
360: if ($nforms) {
361: $r->print('<form method="post" action="'.
362: $requrl.'">');
363: }
364: # ----------------------------------------------------------------- Start table
365: $r->print('<table cols="'.$lcm.'" border="0">');
366: for ($i=0;$i<=$#rows;$i++) {
367: if ($rows[$i]) {
368: $r->print("\n<tr>");
369: my @colcont=split(/\&/,$rows[$i]);
370: my $avespan=$lcm/($#colcont+1);
371: for ($j=0;$j<=$#colcont;$j++) {
372: my $rid=$colcont[$j];
373: my $metainfo='<a href="'.
374: $metalink{$rid}.'" target="LONcatInfo">'.
375: '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
376: '</img></a>';
377: if (
378: ($hash{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
379: (&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'}))) {
380: my ($mapid,$resid)=split(/\./,$rid);
381: my $symb=
382: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
383: '___'.$resid.'___'.
384: &Apache::lonnet::declutter($hash{'src_'.$rid});
385: $metainfo.=
386: '<a href="/adm/grades?symb='.$symb.
387: '&command=submission" target="LONcatInfo">'.
388: '<img src="/adm/lonMisc/subm_button.gif" border=0>'.
389: '</img></a>'.
390: '<a href="/adm/grades?symb='.$symb.
391: '&command=viewgrades" target="LONcatInfo">'.
392: '<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
393: '</img></a>'.
394: '<a href="/adm/parmset?symb='.$symb.'" target="LONcatInfo">'.
395: '<img src="/adm/lonMisc/pprm_button.gif" border=0>'.
396: '</img></a>';
397: }
398: $metainfo.='<br></br>';
399: $r->print('<td colspan="'.$avespan.'"');
400: if ($cellemb{$rid} eq 'ssi') {
401: if ($ssibgcolor{$rid}) {
402: $r->print(' bgcolor="'.
403: $ssibgcolor{$rid}.'"');
404: }
405: $r->print('>'.$metainfo.'<font');
406: if ($ssitext{$rid}) {
407: $r->print(' text="'.$ssitext{$rid}.'"');
408: }
409: if ($ssilink{$rid}) {
410: $r->print(' link="'.$ssilink{$rid}.'"');
411: }
412: if ($ssitext{$rid}) {
413: $r->print(' vlink="'.$ssivlink{$rid}.'"');
414: }
415: if ($ssialink{$rid}) {
416: $r->print(' alink="'.$ssialink{$rid}.'"');
417: }
418:
419: $r->print('>'.$ssibody{$rid}.'</font>');
420: } elsif ($cellemb{$rid} eq 'img') {
421: $r->print('>'.$metainfo.'<img src="'.
422: $hash{'src_'.$rid}.'"></img>');
423: } elsif ($cellemb{$rid} eq 'emb') {
424: $r->print('>'.$metainfo.'<embed src="'.
425: $hash{'src_'.$rid}.'"></embed>');
426: }
427: $r->print('</td>');
428: }
429: $r->print('</tr>');
430: }
431: }
432: $r->print("\n</table>");
433: # ---------------------------------------------------------------- Submit, etc.
434: if ($nforms) {
435: $r->print(
436: '<input name="all_submit" value="Submit All" type="'.
437: (($nforms>1)?'submit':'hidden').'"></input></form>');
438: }
439: $r->print('</body>'.&Apache::lonxml::xmlend());
440: # -------------------------------------------------------------------- End page
441: }
442: # ------------------------------------------------------------- End render page
443: } else {
444: $r->content_type('text/html');
445: $r->send_http_header;
446: $r->print('<html><body>Page undefined.</body></html>');
447: }
448: # ------------------------------------------------------------------ Untie hash
449: unless (untie(%hash)) {
450: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
451: "Could not untie coursemap $fn (browse).</font>");
452: }
453: # -------------------------------------------------------------------- All done
454: return OK;
455: # ----------------------------------------------- Errors, hash could no be tied
456: }
457: }
458: }
459: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
460: return HTTP_NOT_ACCEPTABLE;
461: }
462:
463: 1;
464: __END__
465:
466: =head1 NAME
467:
468: Apache::lonpage - Page Handler
469:
470: =head1 SYNOPSIS
471:
472: Invoked by /etc/httpd/conf/srm.conf:
473:
474: <LocationMatch "^/res/.*\.page$>
475: SetHandler perl-script
476: PerlHandler Apache::lonpage
477: </LocationMatch>
478:
479: =head1 INTRODUCTION
480:
481: This module renders a .page resource.
482:
483: This is part of the LearningOnline Network with CAPA project
484: described at http://www.lon-capa.org.
485:
486: =head1 HANDLER SUBROUTINE
487:
488: This routine is called by Apache and mod_perl.
489:
490: =over 4
491:
492: =item *
493:
494: set document type for header only
495:
496: =item *
497:
498: tie db file
499:
500: =item *
501:
502: render page
503:
504: =item *
505:
506: add to symb list
507:
508: =item *
509:
510: page parms
511:
512: =item *
513:
514: Get SSI output, post parameters
515:
516: =item *
517:
518: SSI cell rendering
519:
520: =item *
521:
522: Deal with Applet codebases
523:
524: =item *
525:
526: Build page
527:
528: =item *
529:
530: send headers
531:
532: =item *
533:
534: start body
535:
536: =item *
537:
538: start form
539:
540: =item *
541:
542: start table
543:
544: =item *
545:
546: submit element, etc, render page, untie hash
547:
548: =back
549:
550: =head1 OTHER SUBROUTINES
551:
552: =over 4
553:
554: =item *
555:
556: euclid() : Euclid's method for determining the greatest common denominator.
557:
558: =item *
559:
560: tracetable() : Build page table.
561:
562: =back
563:
564: =cut
565:
566:
567:
568:
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