1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
4: # $Id: lonpage.pm,v 1.51 2003/04/18 13:58:44 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: # (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: # YEAR=2002
37: # 03/19 Gerd Kortemeyer
38: #
39: ###
40:
41: package Apache::lonpage;
42:
43: use strict;
44: use Apache::Constants qw(:common :http);
45: use Apache::lonnet();
46: use Apache::loncommon();
47: use Apache::lonxml();
48: use Apache::lonmenu;
49: use HTML::TokeParser;
50: use GDBM_File;
51: use Apache::lonsequence;
52:
53: # -------------------------------------------------------------- Module Globals
54: my %hash;
55: my @rows;
56:
57: # ------------------------------------------------------------------ Euclid gcd
58:
59: sub euclid {
60: my ($e,$f)=@_;
61: my $a; my $b; my $r;
62: if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
63: while ($r!=0) {
64: $a=$b; $b=$r;
65: $r=$a%$b;
66: }
67: return $b;
68: }
69:
70: # ------------------------------------------------------------ Build page table
71:
72: sub tracetable {
73: my ($sofar,$rid,$beenhere)=@_;
74: my $further=$sofar;
75: unless ($beenhere=~/\&$rid\&/) {
76: $beenhere.=$rid.'&';
77:
78: if (defined($hash{'is_map_'.$rid})) {
79: if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
80: (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
81: my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
82: $sofar=
83: &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
84: '&'.$frid.'&');
85: $sofar++;
86: if ($hash{'src_'.$frid}) {
87: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid});
88: if (($brepriv eq '2') || ($brepriv eq 'F')) {
89: if (defined($rows[$sofar])) {
90: $rows[$sofar].='&'.$frid;
91: } else {
92: $rows[$sofar]=$frid;
93: }
94: }
95: }
96: }
97: } else {
98: $sofar++;
99: if ($hash{'src_'.$rid}) {
100: my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid});
101: if (($brepriv eq '2') || ($brepriv eq 'F')) {
102: if (defined($rows[$sofar])) {
103: $rows[$sofar].='&'.$rid;
104: } else {
105: $rows[$sofar]=$rid;
106: }
107: }
108: }
109: }
110:
111: if (defined($hash{'to_'.$rid})) {
112: my $mincond=1;
113: my $next='';
114: foreach (split(/\,/,$hash{'to_'.$rid})) {
115: my $thiscond=
116: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
117: if ($thiscond>=$mincond) {
118: if ($next) {
119: $next.=','.$_.':'.$thiscond;
120: } else {
121: $next=$_.':'.$thiscond;
122: }
123: if ($thiscond>$mincond) { $mincond=$thiscond; }
124: }
125: }
126: foreach (split(/\,/,$next)) {
127: my ($linkid,$condval)=split(/\:/,$_);
128: if ($condval>=$mincond) {
129: my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere);
130: if ($now>$further) { $further=$now; }
131: }
132: }
133:
134: }
135: }
136: return $further;
137: }
138:
139: # ================================================================ Main Handler
140:
141: sub handler {
142: my $r=shift;
143:
144: # ------------------------------------------- Set document type for header only
145:
146: if ($r->header_only) {
147: if ($ENV{'browser.mathml'}) {
148: $r->content_type('text/xml');
149: } else {
150: $r->content_type('text/html');
151: }
152: $r->send_http_header;
153: return OK;
154: }
155:
156: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
157: ['forceselect','launch']);
158: my $number_of_columns = 1;
159: my $requrl=$r->uri;
160: my $target = $ENV{'form.grade_target'};
161: # ----------------------------------------------------------------- Tie db file
162: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
163: my $fn=$ENV{'request.course.fn'};
164: if (-e "$fn.db") {
165: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
166: # ------------------------------------------------------------------- Hash tied
167: my $firstres=$hash{'map_start_'.$requrl};
168: my $lastres=$hash{'map_finish_'.$requrl};
169: if (($firstres) && ($lastres)) {
170: # ----------------------------------------------------------------- Render page
171:
172: @rows=();
173:
174: &tracetable(0,$firstres,'&');
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: $output=~
243: s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
244: if ($target eq 'tex') {
245: $output =~ s/^([^&]+)\\begin{document}//;
246: $output =~ s/\\end{document}//;
247: $output = '\parbox{\minipagewidth}{ '.$output.' }';
248: #some additional cleanup necessary for LateX (due to limitations of table environment
249: $output =~ s/(\\vskip\s*\d+mm)\s*(\\\\)+/$1/g;
250: }
251: my $parser=HTML::TokeParser->new(\$output);
252: my $token;
253: my $thisdir=$src;
254: my $bodydef=0;
255: my $thisxml=0;
256: my @rlinks=();
257: if ($output=~/\?xml/) {
258: $isxml=1;
259: $thisxml=1;
260: $output=~
261: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
262: $xmlheader=$1;
263: }
264: while ($token=$parser->get_token) {
265: if ($token->[0] eq 'S') {
266: if ($token->[1] eq 'a') {
267: if ($token->[2]->{'href'}) {
268: $rlinks[$#rlinks+1]=
269: $token->[2]->{'href'};
270: }
271: } elsif ($token->[1] eq 'img') {
272: $rlinks[$#rlinks+1]=
273: $token->[2]->{'src'};
274: } elsif ($token->[1] eq 'embed') {
275: $rlinks[$#rlinks+1]=
276: $token->[2]->{'src'};
277: } elsif ($token->[1] eq 'base') {
278: $thisdir=$token->[2]->{'href'};
279: } elsif ($token->[1] eq 'body') {
280: $bodydef=1;
281: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
282: $ssitext{$_}=$token->[2]->{'text'};
283: $ssilink{$_}=$token->[2]->{'link'};
284: $ssivlink{$_}=$token->[2]->{'vlink'};
285: $ssialink{$_}=$token->[2]->{'alink'};
286: if ($thisxml) {
287: $xmlbody=$token->[4];
288: }
289: } elsif ($token->[1] eq 'meta') {
290: if ($token->[4] !~ m:/>$:) {
291: $allmeta.="\n".$token->[4].'</meta>';
292: } else {
293: $allmeta.="\n".$token->[4];
294: }
295: } elsif (($token->[1] eq 'script') &&
296: ($bodydef==0)) {
297: $allscript.="\n\n"
298: .$parser->get_text('/script');
299: }
300: }
301: }
302: if ($output=~/\<body[^\>]*\>(.*)/si) {
303: $output=$1;
304: }
305: $output=~s/\<\/body\>.*//si;
306: if ($output=~/\<form/si) {
307: $nforms++;
308: $output=~s/\<form[^\>]*\>//gsi;
309: $output=~s/\<\/form[^\>]*\>//gsi;
310: $output=~
311: s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
312: }
313: $thisdir=~s/\/[^\/]*$//;
314: foreach (@rlinks) {
315: unless (($_=~/^http:\/\//i) ||
316: ($_=~/^\//) ||
317: ($_=~/^javascript:/i) ||
318: ($_=~/^mailto:/i) ||
319: ($_=~/^\#/)) {
320: my $newlocation=
321: &Apache::lonnet::hreflocation($thisdir,$_);
322: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
323: }
324: }
325: # -------------------------------------------------- Deal with Applet codebases
326: $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
327: $ssibody{$_}=$output;
328: # ---------------------------------------------------------------- End SSI cell
329: }
330: }
331: }
332: }
333: unless ($contents) {
334: $r->content_type('text/html');
335: $r->send_http_header;
336: $r->print('<html><body>Empty page.</body></html>');
337: } else {
338: # ------------------------------------------------------------------ Build page
339:
340: # ---------------------------------------------------------------- Send headers
341: unless ($target eq 'tex') {
342: if ($isxml) {
343: $r->content_type('text/xml');
344: $r->send_http_header;
345: $r->print($xmlheader);
346: } else {
347: $r->content_type('text/html');
348: $r->send_http_header;
349: $r->print('<html>');
350: }
351: # ------------------------------------------------------------------------ Head
352: $r->print("\n<head>\n".$allmeta);
353: if ($allscript) {
354: $r->print("\n<script language='JavaScript'>\n".
355: $allscript."\n</script>\n");
356: }
357: $r->print(&Apache::lonmenu::registerurl(1,undef));
358: $r->print("\n</head>\n");
359: # ------------------------------------------------------------------ Start body
360: if ($isxml) {
361: $r->print($xmlbody);
362: } else {
363: $r->print(
364: '<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonmenu::loadevents.
365: '" onUnload="'.&Apache::lonmenu::unloadevents.'">'.
366: &Apache::lonmenu::menubuttons(undef,$target,1)
367: );
368: }
369: # ------------------------------------------------------------------ Start form
370: if ($nforms) {
371: $r->print('<form method="post" action="'.
372: $requrl.'">');
373: }
374: } else {
375: $r->print('\documentclass{article}
376: \newcommand{\keephidden}[1]{}
377: \usepackage[dvips]{graphicx}
378: \usepackage{epsfig}
379: \usepackage{calc}
380: \usepackage{longtable}
381: \begin{document}');
382: }
383: # ----------------------------------------------------------------- Start table
384: if ($target eq 'tex') {
385: $r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
386: if ($number_of_columns le $lcm) {$number_of_columns=$lcm;};
387: } else {
388: $r->print('<table cols="'.$lcm.'" border="0">');
389: }
390: for ($i=0;$i<=$#rows;$i++) {
391: if ($rows[$i]) {
392: unless ($target eq 'tex') {
393: $r->print("\n<tr>");
394: }
395: my @colcont=split(/\&/,$rows[$i]);
396: my $avespan=$lcm/($#colcont+1);
397: for ($j=0;$j<=$#colcont;$j++) {
398: my $rid=$colcont[$j];
399: my $metainfo='<a href="'.
400: $metalink{$rid}.'" target="LONcatInfo">'.
401: '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
402: '</img></a><a href="/adm/evaluate?postdata='.
403: &Apache::lonnet::escape(&Apache::lonnet::declutter($hash{'src_'.$rid}))
404: .'" target="LONcatInfo">'.
405: '<img src="/adm/lonMisc/eval_button.gif" border=0>'.
406: '</img></a>';
407: if (
408: ($hash{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
409: (&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'}))) {
410: my ($mapid,$resid)=split(/\./,$rid);
411: my $symb=
412: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
413: '___'.$resid.'___'.
414: &Apache::lonnet::declutter($hash{'src_'.$rid});
415: $metainfo.=
416: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
417: '&command=submission" target="LONcatInfo">'.
418: '<img src="/adm/lonMisc/subm_button.gif" border=0>'.
419: '</img></a>'.
420: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
421: '&command=gradingmenu" target="LONcatInfo">'.
422: '<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
423: '</img></a>'.
424: '<a href="/adm/parmset?symb='.&Apache::lonnet::escape($symb).
425: '" target="LONcatInfo">'.
426: '<img src="/adm/lonMisc/pprm_button.gif" border=0>'.
427: '</img></a>';
428: }
429: $metainfo.='<br></br>';
430: unless ($target eq 'tex') {
431: $r->print('<td colspan="'.$avespan.'"');
432: }
433: if ($cellemb{$rid} eq 'ssi') {
434: unless ($target eq 'tex') {
435: if ($ssibgcolor{$rid}) {
436: $r->print(' bgcolor="'.
437: $ssibgcolor{$rid}.'"');
438: }
439: $r->print('>'.$metainfo.'<font');
440:
441: if ($ssitext{$rid}) {
442: $r->print(' text="'.$ssitext{$rid}.'"');
443: }
444: if ($ssilink{$rid}) {
445: $r->print(' link="'.$ssilink{$rid}.'"');
446: }
447: if ($ssitext{$rid}) {
448: $r->print(' vlink="'.$ssivlink{$rid}.'"');
449: }
450: if ($ssialink{$rid}) {
451: $r->print(' alink="'.$ssialink{$rid}.'"');
452: }
453: $r->print('>');
454: }
455: $r->print($ssibody{$rid});
456: unless ($target eq 'tex') {
457: $r->print('</font>');
458: }
459: if ($ENV{'course.'.
460: $ENV{'request.course.id'}.
461: '.pageseparators'} eq 'yes') {
462: unless($target eq 'tex') {
463: $r->print('<hr />');
464: } else {
465: $r->print('\hline');
466: }
467: }
468: } elsif ($cellemb{$rid} eq 'img') {
469: $r->print('>'.$metainfo.'<img src="'.
470: $hash{'src_'.$rid}.'"></img>');
471: } elsif ($cellemb{$rid} eq 'emb') {
472: $r->print('>'.$metainfo.'<embed src="'.
473: $hash{'src_'.$rid}.'"></embed>');
474: }
475: unless ($target eq 'tex') {
476: $r->print('</td>');
477: } else {
478: for (my $incol=1;$incol<=$avespan;$incol++) {
479: $r->print(' & ');
480: }
481: }
482: }
483: unless ($target eq 'tex') {
484: $r->print('</tr>');
485: } else {
486: $r->print('REMOVETHEHEADOFLONGTABLE\\\\');
487: }
488: }
489: }
490: unless ($target eq 'tex') {
491: $r->print("\n</table>");
492: } else {
493: $r->print('\end{longtable}\strut');
494: }
495: # ---------------------------------------------------------------- Submit, etc.
496: if ($nforms) {
497: $r->print(
498: '<input name="all_submit" value="Submit All" type="'.
499: (($nforms>1)?'submit':'hidden').'"></input></form>');
500: }
501: unless ($target eq 'tex') {
502: $r->print('</body>'.&Apache::lonxml::xmlend());
503: } else {
504: $r->print('\end{document}'.$number_of_columns);
505: }
506: # -------------------------------------------------------------------- End page
507: }
508: # ------------------------------------------------------------- End render page
509: } else {
510: $r->content_type('text/html');
511: $r->send_http_header;
512: &Apache::lonsequence::viewmap($r,$requrl);
513: }
514: # ------------------------------------------------------------------ Untie hash
515: unless (untie(%hash)) {
516: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
517: "Could not untie coursemap $fn (browse).</font>");
518: }
519: # -------------------------------------------------------------------- All done
520: return OK;
521: # ----------------------------------------------- Errors, hash could no be tied
522: }
523: }
524: }
525: $r->content_type('text/html');
526: $r->send_http_header;
527: &Apache::lonsequence::viewmap($r,$requrl);
528: return OK;
529: }
530:
531: 1;
532: __END__
533:
534: =head1 NAME
535:
536: Apache::lonpage - Page Handler
537:
538: =head1 SYNOPSIS
539:
540: Invoked by /etc/httpd/conf/srm.conf:
541:
542: <LocationMatch "^/res/.*\.page$>
543: SetHandler perl-script
544: PerlHandler Apache::lonpage
545: </LocationMatch>
546:
547: =head1 INTRODUCTION
548:
549: This module renders a .page resource.
550:
551: This is part of the LearningOnline Network with CAPA project
552: described at http://www.lon-capa.org.
553:
554: =head1 HANDLER SUBROUTINE
555:
556: This routine is called by Apache and mod_perl.
557:
558: =over 4
559:
560: =item *
561:
562: set document type for header only
563:
564: =item *
565:
566: tie db file
567:
568: =item *
569:
570: render page
571:
572: =item *
573:
574: add to symb list
575:
576: =item *
577:
578: page parms
579:
580: =item *
581:
582: Get SSI output, post parameters
583:
584: =item *
585:
586: SSI cell rendering
587:
588: =item *
589:
590: Deal with Applet codebases
591:
592: =item *
593:
594: Build page
595:
596: =item *
597:
598: send headers
599:
600: =item *
601:
602: start body
603:
604: =item *
605:
606: start form
607:
608: =item *
609:
610: start table
611:
612: =item *
613:
614: submit element, etc, render page, untie hash
615:
616: =back
617:
618: =head1 OTHER SUBROUTINES
619:
620: =over 4
621:
622: =item *
623:
624: euclid() : Euclid's method for determining the greatest common denominator.
625:
626: =item *
627:
628: tracetable() : Build page table.
629:
630: =back
631:
632: =cut
633:
634:
635:
636:
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