File:
[LON-CAPA] /
rat /
lonpage.pm
Revision
1.54:
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Tue Oct 21 20:40:10 2003 UTC (20 years, 11 months ago) by
albertel
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MAIN
CVS tags:
version_1_1_X,
version_1_1_3,
version_1_1_2,
version_1_1_1,
version_1_1_0,
version_1_0_99_3,
version_1_0_99_2,
version_1_0_99_1,
version_1_0_99,
HEAD
- need to recognize when called with target of meta and gracefully return blank (BUG#2022)
1: # The LearningOnline Network with CAPA
2: # Page Handler
3: #
4: # $Id: lonpage.pm,v 1.54 2003/10/21 20:40:10 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: # (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 ($ENV{'browser.mathml'}) {
148: &Apache::loncommon::content_type($r,'text/xml');
149: } else {
150: &Apache::loncommon::content_type($r,'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: &Apache::lonnet::logthis("Got a target of $target");
162: if ($target eq 'meta') {
163: &Apache::loncommon::content_type($r,'text/html');
164: $r->send_http_header;
165: return OK;
166: }
167: # ----------------------------------------------------------------- Tie db file
168: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
169: my $fn=$ENV{'request.course.fn'};
170: if (-e "$fn.db") {
171: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
172: # ------------------------------------------------------------------- Hash tied
173: my $firstres=$hash{'map_start_'.$requrl};
174: my $lastres=$hash{'map_finish_'.$requrl};
175: if (($firstres) && ($lastres)) {
176: # ----------------------------------------------------------------- Render page
177:
178: @rows=();
179:
180: &tracetable(0,$firstres,'&');
181:
182: # ------------------------------------------------------------ Add to symb list
183:
184: my $i;
185: my %symbhash=();
186: for ($i=0;$i<=$#rows;$i++) {
187: if ($rows[$i]) {
188: my @colcont=split(/\&/,$rows[$i]);
189: foreach (@colcont) {
190: $symbhash{$hash{'src_'.$_}}='';
191: }
192: }
193: }
194: &Apache::lonnet::symblist($requrl,%symbhash);
195:
196: # ------------------------------------------------------------------ Page parms
197:
198: my $j;
199: my $lcm=1;
200: my $contents=0;
201: my $nforms=0;
202:
203: my %ssibody=();
204: my %ssibgcolor=();
205: my %ssitext=();
206: my %ssilink=();
207: my %ssivlink=();
208: my %ssialink=();
209:
210: my %metalink=();
211:
212: my %cellemb=();
213:
214: my $allscript='';
215: my $allmeta='';
216:
217: my $isxml=0;
218: my $xmlheader='';
219: my $xmlbody='';
220:
221: # --------------------------------------------- Get SSI output, post parameters
222:
223: for ($i=0;$i<=$#rows;$i++) {
224: if ($rows[$i]) {
225: $contents++;
226: my @colcont=split(/\&/,$rows[$i]);
227: $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
228: foreach (@colcont) {
229: my $src=$hash{'src_'.$_};
230: $src=~/\.(\w+)$/;
231: $metalink{$_}=$src.'.meta';
232: $cellemb{$_}=Apache::loncommon::fileembstyle($1);
233: if ($cellemb{$_} eq 'ssi') {
234: # --------------------------------------------------------- This is an SSI cell
235: my $prefix=$_.'_';
236: my %posthash=('request.prefix' => $prefix);
237: if (($ENV{'form.'.$prefix.'submit'})
238: || ($ENV{'form.all_submit'})) {
239: foreach (keys %ENV) {
240: if ($_=~/^form.$prefix/) {
241: my $name=$_;
242: $name=~s/^form.$prefix//;
243: $posthash{$name}=$ENV{$_};
244: }
245: }
246: }
247: my $output=Apache::lonnet::ssi($src,%posthash);
248: $output=~
249: s/\/\/ BEGIN LON\-CAPA Internal.+\/\/ END LON\-CAPA Internal\s//gs;
250: if ($target eq 'tex') {
251: $output =~ s/^([^&]+)\\begin{document}//;
252: $output =~ s/\\end{document}//;
253: $output = '\parbox{\minipagewidth}{ '.$output.' }';
254: #some additional cleanup necessary for LateX (due to limitations of table environment
255: $output =~ s/(\\vskip\s*\d+mm)\s*(\\\\)+/$1/g;
256: }
257: my $parser=HTML::TokeParser->new(\$output);
258: my $token;
259: my $thisdir=$src;
260: my $bodydef=0;
261: my $thisxml=0;
262: my @rlinks=();
263: if ($output=~/\?xml/) {
264: $isxml=1;
265: $thisxml=1;
266: $output=~
267: /((?:\<(?:\?xml|\!DOC|html)[^\>]*(?:\>|\>\]\>)\s*)+)\<body[^\>]*\>/si;
268: $xmlheader=$1;
269: }
270: while ($token=$parser->get_token) {
271: if ($token->[0] eq 'S') {
272: if ($token->[1] eq 'a') {
273: if ($token->[2]->{'href'}) {
274: $rlinks[$#rlinks+1]=
275: $token->[2]->{'href'};
276: }
277: } elsif ($token->[1] eq 'img') {
278: $rlinks[$#rlinks+1]=
279: $token->[2]->{'src'};
280: } elsif ($token->[1] eq 'embed') {
281: $rlinks[$#rlinks+1]=
282: $token->[2]->{'src'};
283: } elsif ($token->[1] eq 'base') {
284: $thisdir=$token->[2]->{'href'};
285: } elsif ($token->[1] eq 'body') {
286: $bodydef=1;
287: $ssibgcolor{$_}=$token->[2]->{'bgcolor'};
288: $ssitext{$_}=$token->[2]->{'text'};
289: $ssilink{$_}=$token->[2]->{'link'};
290: $ssivlink{$_}=$token->[2]->{'vlink'};
291: $ssialink{$_}=$token->[2]->{'alink'};
292: if ($thisxml) {
293: $xmlbody=$token->[4];
294: }
295: } elsif ($token->[1] eq 'meta') {
296: if ($token->[4] !~ m:/>$:) {
297: $allmeta.="\n".$token->[4].'</meta>';
298: } else {
299: $allmeta.="\n".$token->[4];
300: }
301: } elsif (($token->[1] eq 'script') &&
302: ($bodydef==0)) {
303: $allscript.="\n\n"
304: .$parser->get_text('/script');
305: }
306: }
307: }
308: if ($output=~/\<body[^\>]*\>(.*)/si) {
309: $output=$1;
310: }
311: $output=~s/\<\/body\>.*//si;
312: if ($output=~/\<form/si) {
313: $nforms++;
314: $output=~s/\<form[^\>]*\>//gsi;
315: $output=~s/\<\/form[^\>]*\>//gsi;
316: $output=~
317: s/\<((?:input|select|button|textarea)[^\>]+)name\s*\=\s*[\'\"]*([\w\.\:]+)[\'\"]*([^\>]*)\>/\<$1 name="$prefix$2" $3\>/gsi;
318: }
319: $thisdir=~s/\/[^\/]*$//;
320: foreach (@rlinks) {
321: unless (($_=~/^http:\/\//i) ||
322: ($_=~/^\//) ||
323: ($_=~/^javascript:/i) ||
324: ($_=~/^mailto:/i) ||
325: ($_=~/^\#/)) {
326: my $newlocation=
327: &Apache::lonnet::hreflocation($thisdir,$_);
328: $output=~s/(\"|\'|\=\s*)$_(\"|\'|\s|\>)/$1$newlocation$2/;
329: }
330: }
331: # -------------------------------------------------- Deal with Applet codebases
332: $output=~s/(\<applet[^\>]+)(codebase\=[^\S\>]+)*([^\>]*)\>/$1.($2?$2:' codebase="'.$thisdir.'"').$3.'>'/gei;
333: $ssibody{$_}=$output;
334: # ---------------------------------------------------------------- End SSI cell
335: }
336: }
337: }
338: }
339: unless ($contents) {
340: &Apache::loncommon::content_type($r,'text/html');
341: $r->send_http_header;
342: $r->print('<html><body>'.&mt('Empty page').'.</body></html>');
343: } else {
344: # ------------------------------------------------------------------ Build page
345:
346: # ---------------------------------------------------------------- Send headers
347: unless ($target eq 'tex') {
348: if ($isxml) {
349: &Apache::loncommon::content_type($r,'text/xml');
350: $r->send_http_header;
351: $r->print($xmlheader);
352: } else {
353: &Apache::loncommon::content_type($r,'text/html');
354: $r->send_http_header;
355: $r->print('<html>');
356: }
357: # ------------------------------------------------------------------------ Head
358: $r->print("\n<head>\n".$allmeta);
359: if ($allscript) {
360: $r->print("\n<script language='JavaScript'>\n".
361: $allscript."\n</script>\n");
362: }
363: $r->print(&Apache::lonmenu::registerurl(1,undef));
364: $r->print("\n</head>\n");
365: # ------------------------------------------------------------------ Start body
366: if ($isxml) {
367: $r->print($xmlbody);
368: } else {
369: $r->print(
370: '<body bgcolor="#FFFFFF" onLoad="'.&Apache::lonmenu::loadevents.
371: '" onUnload="'.&Apache::lonmenu::unloadevents.'">'.
372: &Apache::lonmenu::menubuttons(undef,$target,1)
373: );
374: }
375: # ------------------------------------------------------------------ Start form
376: if ($nforms) {
377: $r->print('<form method="post" action="'.
378: $requrl.'">');
379: }
380: } else {
381: $r->print('\documentclass{article}
382: \newcommand{\keephidden}[1]{}
383: \usepackage[dvips]{graphicx}
384: \usepackage{epsfig}
385: \usepackage{calc}
386: \usepackage{longtable}
387: \begin{document}');
388: }
389: # ----------------------------------------------------------------- Start table
390: if ($target eq 'tex') {
391: $r->print('\begin{longtable}INSERTTHEHEADOFLONGTABLE\endfirsthead\endhead ');
392: if ($number_of_columns le $lcm) {$number_of_columns=$lcm;};
393: } else {
394: $r->print('<table cols="'.$lcm.'" border="0">');
395: }
396: for ($i=0;$i<=$#rows;$i++) {
397: if ($rows[$i]) {
398: unless ($target eq 'tex') {
399: $r->print("\n<tr>");
400: }
401: my @colcont=split(/\&/,$rows[$i]);
402: my $avespan=$lcm/($#colcont+1);
403: for ($j=0;$j<=$#colcont;$j++) {
404: my $rid=$colcont[$j];
405: my $metainfo='<a href="'.
406: $metalink{$rid}.'" target="LONcatInfo">'.
407: '<img src="/adm/lonMisc/cat_button.gif" border=0>'.
408: '</img></a><a href="/adm/evaluate?postdata='.
409: &Apache::lonnet::escape(&Apache::lonnet::declutter($hash{'src_'.$rid}))
410: .'" target="LONcatInfo">'.
411: '<img src="/adm/lonMisc/eval_button.gif" border=0>'.
412: '</img></a>';
413: if (
414: ($hash{'src_'.$rid}=~/\.(problem|exam|quiz|assess|survey|form)$/) &&
415: (&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'}))) {
416: my ($mapid,$resid)=split(/\./,$rid);
417: my $symb=
418: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}).
419: '___'.$resid.'___'.
420: &Apache::lonnet::declutter($hash{'src_'.$rid});
421: $metainfo.=
422: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
423: # '&command=submission" target="LONcatInfo">'.
424: '&command=submission">'.
425: '<img src="/adm/lonMisc/subm_button.gif" border=0>'.
426: '</img></a>'.
427: '<a href="/adm/grades?symb='.&Apache::lonnet::escape($symb).
428: # '&command=gradingmenu" target="LONcatInfo">'.
429: '&command=gradingmenu">'.
430: '<img src="/adm/lonMisc/pgrd_button.gif" border=0>'.
431: '</img></a>'.
432: '<a href="/adm/parmset?symb='.&Apache::lonnet::escape($symb).
433: # '" target="LONcatInfo">'.
434: '" >'.
435: '<img src="/adm/lonMisc/pprm_button.gif" border=0>'.
436: '</img></a>';
437: }
438: $metainfo.='<br></br>';
439: unless ($target eq 'tex') {
440: $r->print('<td colspan="'.$avespan.'"');
441: }
442: if ($cellemb{$rid} eq 'ssi') {
443: unless ($target eq 'tex') {
444: if ($ssibgcolor{$rid}) {
445: $r->print(' bgcolor="'.
446: $ssibgcolor{$rid}.'"');
447: }
448: $r->print('>'.$metainfo.'<font');
449:
450: if ($ssitext{$rid}) {
451: $r->print(' text="'.$ssitext{$rid}.'"');
452: }
453: if ($ssilink{$rid}) {
454: $r->print(' link="'.$ssilink{$rid}.'"');
455: }
456: if ($ssitext{$rid}) {
457: $r->print(' vlink="'.$ssivlink{$rid}.'"');
458: }
459: if ($ssialink{$rid}) {
460: $r->print(' alink="'.$ssialink{$rid}.'"');
461: }
462: $r->print('>');
463: }
464: $r->print($ssibody{$rid});
465: unless ($target eq 'tex') {
466: $r->print('</font>');
467: }
468: if ($ENV{'course.'.
469: $ENV{'request.course.id'}.
470: '.pageseparators'} eq 'yes') {
471: unless($target eq 'tex') {
472: $r->print('<hr />');
473: } else {
474: $r->print('\hline');
475: }
476: }
477: } elsif ($cellemb{$rid} eq 'img') {
478: $r->print('>'.$metainfo.'<img src="'.
479: $hash{'src_'.$rid}.'"></img>');
480: } elsif ($cellemb{$rid} eq 'emb') {
481: $r->print('>'.$metainfo.'<embed src="'.
482: $hash{'src_'.$rid}.'"></embed>');
483: }
484: unless ($target eq 'tex') {
485: $r->print('</td>');
486: } else {
487: for (my $incol=1;$incol<=$avespan;$incol++) {
488: $r->print(' & ');
489: }
490: }
491: }
492: unless ($target eq 'tex') {
493: $r->print('</tr>');
494: } else {
495: $r->print('REMOVETHEHEADOFLONGTABLE\\\\');
496: }
497: }
498: }
499: unless ($target eq 'tex') {
500: $r->print("\n</table>");
501: } else {
502: $r->print('\end{longtable}\strut');
503: }
504: # ---------------------------------------------------------------- Submit, etc.
505: if ($nforms) {
506: $r->print(
507: '<input name="all_submit" value="Submit All" type="'.
508: (($nforms>1)?'submit':'hidden').'"></input></form>');
509: }
510: unless ($target eq 'tex') {
511: $r->print('</body>'.&Apache::lonxml::xmlend());
512: } else {
513: $r->print('\end{document}'.$number_of_columns);
514: }
515: # -------------------------------------------------------------------- End page
516: }
517: # ------------------------------------------------------------- End render page
518: } else {
519: $r->content_type('text/html');
520: $r->send_http_header;
521: &Apache::lonsequence::viewmap($r,$requrl);
522: }
523: # ------------------------------------------------------------------ Untie hash
524: unless (untie(%hash)) {
525: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
526: "Could not untie coursemap $fn (browse).</font>");
527: }
528: # -------------------------------------------------------------------- All done
529: return OK;
530: # ----------------------------------------------- Errors, hash could no be tied
531: }
532: }
533: }
534: $r->content_type('text/html');
535: $r->send_http_header;
536: &Apache::lonsequence::viewmap($r,$requrl);
537: return OK;
538: }
539:
540: 1;
541: __END__
542:
543: =head1 NAME
544:
545: Apache::lonpage - Page Handler
546:
547: =head1 SYNOPSIS
548:
549: Invoked by /etc/httpd/conf/srm.conf:
550:
551: <LocationMatch "^/res/.*\.page$>
552: SetHandler perl-script
553: PerlHandler Apache::lonpage
554: </LocationMatch>
555:
556: =head1 INTRODUCTION
557:
558: This module renders a .page resource.
559:
560: This is part of the LearningOnline Network with CAPA project
561: described at http://www.lon-capa.org.
562:
563: =head1 HANDLER SUBROUTINE
564:
565: This routine is called by Apache and mod_perl.
566:
567: =over 4
568:
569: =item *
570:
571: set document type for header only
572:
573: =item *
574:
575: tie db file
576:
577: =item *
578:
579: render page
580:
581: =item *
582:
583: add to symb list
584:
585: =item *
586:
587: page parms
588:
589: =item *
590:
591: Get SSI output, post parameters
592:
593: =item *
594:
595: SSI cell rendering
596:
597: =item *
598:
599: Deal with Applet codebases
600:
601: =item *
602:
603: Build page
604:
605: =item *
606:
607: send headers
608:
609: =item *
610:
611: start body
612:
613: =item *
614:
615: start form
616:
617: =item *
618:
619: start table
620:
621: =item *
622:
623: submit element, etc, render page, untie hash
624:
625: =back
626:
627: =head1 OTHER SUBROUTINES
628:
629: =over 4
630:
631: =item *
632:
633: euclid() : Euclid's method for determining the greatest common denominator.
634:
635: =item *
636:
637: tracetable() : Build page table.
638:
639: =back
640:
641: =cut
642:
643:
644:
645:
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