1: # The LearningOnline Network with CAPA
2: # Wrapper for external and binary files as standalone resources
3: #
4: # $Id: lonwrapper.pm,v 1.81 2022/10/29 18:52:58 raeburn 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:
29:
30: package Apache::lonwrapper;
31:
32: use strict;
33: use Apache::Constants qw(:common);
34: use Apache::lonenc();
35: use Apache::lonnet;
36: use Apache::lonlocal;
37: use Apache::loncommon();
38: use Apache::lonhtmlcommon();
39: use Apache::lonextresedit();
40: use Apache::lonexttool();
41: use Apache::lonhomework();
42: use Apache::lonnavmaps();
43: use LONCAPA qw(:DEFAULT :match);
44: use HTML::Entities();
45: use Digest::MD5();
46:
47: # ================================================================ Main Handler
48: sub wrapper {
49: my ($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,$linktext,$explanation,
50: $title,$width,$height,$reuse,$is_supp) = @_;
51:
52: my $forcereg;
53: unless ($env{'form.folderpath'}) {
54: $forcereg = 1;
55: }
56: my %lt = &Apache::lonlocal::texthash(
57: 'noif' => 'No iframe support.',
58: 'show' => 'Show content in pop-up window',
59: );
60:
61: (undef,undef,undef,undef,undef,undef,my $clientmobile) =
62: &Apache::loncommon::decode_user_agent($r);
63:
64: my ($anchor,$uselink);
65: if ($is_ext) {
66: if ($env{'form.symb'}) {
67: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
68: if ($res =~ /(#[^#]+)$/) {
69: $anchor = $1;
70: }
71: } elsif ($env{'form.anchor'} ne '') {
72: $anchor = '#'.$env{'form.anchor'};
73: }
74: if (($is_ext eq 'tab') || ($is_ext eq 'window')) {
75: $uselink = 1;
76: }
77: unless (($is_pdf && $clientmobile) || $uselink) {
78: my $hostname = $r->hostname();
79: my $lonhost = $r->dir_config('lonHostID');
80: my $ip = &Apache::lonnet::get_host_ip($lonhost);
81: $uselink = &Apache::loncommon::is_nonframeable($url,$absolute,$hostname,$ip);
82: }
83: }
84:
85: my $noiframe = &Apache::loncommon::modal_link($url.$anchor,$lt{'show'},500,400);
86: my $args = {'bgcolor' => '#FFFFFF'};
87: if ($forcereg) {
88: $args->{'force_register'} = $forcereg;
89: }
90: if (ref($brcrum) eq 'ARRAY') {
91: $args->{'bread_crumbs'} = $brcrum;
92: }
93: if ($absolute) {
94: $args->{'use_absolute'} = $absolute;
95: }
96: if ($env{'form.only_body'}) {
97: $args->{'only_body'} = $env{'form.only_body'};
98: }
99:
100: my ($countdown,$donemsg,$headjs);
101: if (($exttool) && (&Apache::lonnet::EXT('resource.0.gradable') =~ /^yes$/i)) {
102: $Apache::lonhomework::browse = &Apache::lonnet::allowed('bre',$url);
103: if ($env{'form.markaccess'}) {
104: my $symb=&Apache::lonnet::symbread($url);
105: my @interval=&Apache::lonnet::EXT('resource.0.interval',$symb);
106: my ($timelimit) = split(/_/,$interval[0]);
107: my $setres = &Apache::lonnet::set_first_access($interval[1],$timelimit);
108: if ($setres eq 'ok') {
109: delete($env{'form.markaccess'});
110: }
111: } elsif ($env{'form.LC_interval_done'} eq 'true') {
112: my $symb=&Apache::lonnet::symbread($url);
113: if ($symb) {
114: (my $donebuttonresult,$donemsg) = &Apache::lonhomework::zero_timer($symb);
115: undef($env{'form.LC_interval_done'});
116: undef($env{'form.LC_interval_done_proctorpass'});
117: }
118: }
119: my ($status,$result,$resource_due) =
120: &Apache::lonexttool::gradabletool_access_check();
121: undef($Apache::lonhomework::browse);
122: if ($status eq 'CAN_ANSWER') {
123: if ($resource_due) {
124: my $time_left = $resource_due - time();
125: if ($resource_due && ($time_left > 0)) {
126: $countdown ='
127: <script type="text/javascript">
128: // <![CDATA['."\n".
129: &Apache::lonhtmlcommon::countdown().'
130: // ]]>
131: </script>'."\n".
132: &Apache::lonhtmlcommon::set_due_date($resource_due);
133: }
134: }
135: } else {
136: if ($status eq 'SHOW_ANSWER') {
137: $result = &Apache::lonexttool::display_score().
138: &Apache::lonfeedback::list_discussion('tool','OPEN');
139: }
140: return &Apache::loncommon::start_page('Menu',undef,$args).
141: $result.
142: &Apache::loncommon::end_page();
143: }
144: }
145:
146: #
147: # Where iframe is in use, if window.onload() executes before the custom resize function
148: # has been defined (jQuery), two global javascript vars (LCnotready and LCresizedef)
149: # are used to ensure document.ready() triggers a call to resize, so the iframe contents
150: # do not obscure the Functions menu.
151: #
152:
153: unless ($clientmobile || ($exttool eq 'window') || ($exttool eq 'tab') || $uselink) {
154: $headjs = '
155: <script type="text/javascript">
156: // <![CDATA[
157: var LCnotready = 0;
158: var LCresizedef = 0;
159: // ]]>
160: </script>'."\n";
161: }
162:
163: my $startpage = &Apache::loncommon::start_page('Menu',$headjs,$args).$countdown.$donemsg;
164: my $endpage = &Apache::loncommon::end_page();
165:
166: if (($uselink) && ($title eq '')) {
167: if ($env{'form.symb'}) {
168: $title=&Apache::lonnet::gettitle($env{'form.symb'});
169: } elsif (!$is_supp) {
170: my $symb=&Apache::lonnet::symbread($r->uri);
171: if ($symb) {
172: $title=&Apache::lonnet::gettitle($symb);
173: }
174: }
175: }
176: if ($clientmobile || ($exttool eq 'window') || ($exttool eq 'tab') ||
177: ($is_ext eq 'tab') || ($is_ext eq 'window')) {
178: my $output = $startpage;
179: if ($is_pdf) {
180: $linktext = &mt('Link to PDF (for mobile devices)');
181: $output .= &create_link($url,$anchor,$title,$linktext);
182: } elsif (($exttool eq 'window') || ($exttool eq 'tab') ||
183: ($is_ext eq 'tab') || ($is_ext eq 'window')) {
184: my $preamble;
185: if ($linktext eq '') {
186: if ($exttool) {
187: $linktext = &mt('Launch External Tool');
188: } else {
189: $linktext = &mt('Link to External Resource');
190: }
191: }
192: if ($exttool) {
193: $url = &HTML::Entities::encode($url,'"<>&');
194: } else {
195: $url = &HTML::Entities::encode($url.$anchor,'&<>"');
196: }
197: if (($exttool eq 'tab') || ($is_ext eq 'tab')) {
198: my $target;
199: if ($exttool) {
200: $target = 'LCExternalToolTab';
201: } else {
202: if ($reuse) {
203: $target = 'LCExternalResTab';
204: } else {
205: $target = '_blank';
206: }
207: if ($title ne '') {
208: $preamble = '<span style="font-weight:bold;">'.$title.'</span><br />';
209: }
210: }
211: $output .= '<div>'.$preamble.
212: '<a href="'.$url.'" target="'.$target.'" style="padding:0;clear:both;margin:0;border:0">'.
213: $linktext.'</a>'.
214: '</div>';
215: } else {
216: my ($target,$extlinkimg);
217: if ($exttool) {
218: $target = 'LCExternalToolPopUp';
219: } else {
220: $target = 'LCExternalResPopUp';
221: if ($title ne '') {
222: $preamble = '<span style="font-weight:bold;">'.$title.'</span><br />';
223: }
224: $extlinkimg = '<img src="'.&Apache::loncommon::lonhttpdurl($r->dir_config('lonIconsURL').'/externallink.gif').'" width="19" height="18" border="0" />';
225: unless ($reuse) {
226: my $resid;
227: if ($env{'request.course.id'}) {
228: unless (($is_supp) || ($env{'form.folderpath'} =~ /^supplemental/)) {
229: my $symb=&Apache::lonnet::symbread($r->uri);
230: if ($symb) {
231: my $navmap = Apache::lonnavmaps::navmap->new();
232: if (ref($navmap)) {
233: my $res = $navmap->getBySymb($symb);
234: if (ref($res)) {
235: $resid = $res->id;
236: $resid =~ s/\./_/g;
237: }
238: }
239: }
240: }
241: }
242: if ($resid eq '') {
243: $resid = substr(Digest::MD5::md5_hex(Digest::MD5::md5_hex(time(). {}. rand(). $$)), 0, 8);
244: }
245: &js_escape(\$resid);
246: $target .= $resid;
247: }
248: }
249: $output .= <<"ENDLINK";
250: <script type="text/javascript">
251: // <![CDATA[
252: var windowObjectReference = null;
253: var PreviousUrl;
254:
255: function openSinglePopup(strUrl) {
256: if (windowObjectReference == null || windowObjectReference.closed) {
257: windowObjectReference = window.open(strUrl, "$target",
258: "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
259: } else if(PreviousUrl != strUrl) {
260: windowObjectReference = window.open(strUrl, "$target",
261: "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
262: windowObjectReference.focus();
263: } else {
264: windowObjectReference.focus();
265: };
266: PreviousUrl = strUrl;
267: }
268: // ]]>
269: </script>
270: <div>$preamble
271: <a href="$url" target="$target" onclick="openSinglePopup(this.href); return false;">
272: $linktext$extlinkimg</a>
273: </div>
274: ENDLINK
275: }
276: if ($exttool) {
277: if ($explanation ne '') {
278: $output .= '<div>'.$explanation.'</div>';
279: }
280: if (&Apache::lonnet::EXT('resource.0.gradable')) {
281: $output .= &Apache::lonfeedback::list_discussion('tool','OPEN');
282: }
283: }
284: } else {
285: if ($uselink) {
286: $linktext = &mt('Link to resource');
287: $output .= &create_link($url,$anchor,$title,$linktext);
288: } else {
289: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
290: $output .= '<div style="overflow:scroll; -webkit-overflow-scrolling:touch;">'."\n".
291: '<iframe src="'.$dest.'" height="100%" width="100%" frameborder="0">'."\n".
292: "$lt{'noif'} $noiframe\n".
293: "</iframe>\n".
294: "</div>\n";
295: }
296: }
297: $output .= $endpage;
298: return $output;
299: } elsif ($uselink) {
300: $linktext = &mt('Link to resource');
301: return $startpage.&create_link($url,$anchor,$title,$linktext).$endpage;
302: } else {
303: my $offset = 5;
304: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['inhibitmenu']);
305: if ($env{'form.inhibitmenu'} eq 'yes') {
306: $offset = 0;
307: }
308: my $script = &Apache::lonhtmlcommon::scripttag(<<SCRIPT);
309: \$(document).ready( function() {
310: \$(window).unbind('resize').resize(function(){
311: var header = null;
312: var offset = $offset;
313: var height = 0;
314: var hdrtop = 0;
315: if (\$('div.LC_head_subbox:first').length) {
316: header = \$('div.LC_head_subbox:first');
317: offset = 9;
318: } else {
319: if (\$('#LC_breadcrumbs').length) {
320: header = \$('#LC_breadcrumbs');
321: }
322: }
323: if (header != null && header.length) {
324: height = header.height();
325: hdrtop = header.position().top;
326: }
327: var pos = height + hdrtop + offset;
328: \$('.LC_iframecontainer').css('top', pos);
329: });
330: LCresizedef = 1;
331: if (LCnotready == 1) {
332: LCnotready = 0;
333: \$(window).trigger('resize');
334: }
335: });
336: window.onload = function(){
337: if (LCresizedef) {
338: LCnotready = 0;
339: \$(window).trigger('resize');
340: } else {
341: LCnotready = 1;
342: }
343: };
344: SCRIPT
345: # javascript will position the iframe if window was resized (or zoomed)
346: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
347: return <<ENDFRAME;
348: $startpage
349: $script
350: <div class="LC_iframecontainer">
351: <iframe src="$dest">$lt{'noif'} $noiframe</iframe>
352: </div>
353: $endpage
354: ENDFRAME
355: }
356: }
357:
358: sub create_link {
359: my ($url,$anchor,$title,$linktext) = @_;
360: my $shownlink;
361: if ($title eq '') {
362: $title = $env{'form.title'};
363: if ($title eq '') {
364: unless ($env{'request.enc'}) {
365: ($title) = ($url =~ m{/([^/]+)$});
366: $title =~ s/(\?[^\?]+)$//;
367: }
368: }
369: }
370: unless ($title eq '') {
371: $shownlink = '<span style="font-weight:bold;">'.$title.'</span><br />';
372: }
373: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
374: $shownlink .= '<a href="'.$dest.'">'.$linktext.'</a>';
375: return $shownlink;
376: }
377:
378: sub handler {
379: my $r=shift;
380: &Apache::loncommon::content_type($r,'text/html');
381: $r->send_http_header;
382:
383: return OK if $r->header_only;
384:
385: my $url = $r->uri;
386: my ($is_ext,$brcrum,$absolute,$is_pdf,$exttool,$cdom,$cnum,$hostname,
387: $linktext,$explanation,$width,$height,$reuse,$is_supp);
388:
389: for ($url){
390: s|^/adm/wrapper||;
391: $is_ext = $_ =~ s|^/ext/|http://|;
392: s|http://https://|https://| if ($is_ext);
393: s|:|:|g;
394: }
395:
396: if ($url =~ /\.pdf$/i) {
397: $is_pdf = 1;
398: } elsif (($is_ext) && ($env{'request.course.id'})) {
399: if ($env{'course.'.$env{'request.course.id'}.'.extresource'}) {
400: (my $selected,$reuse,$width,$height) = split(/:/,$env{'course.'.$env{'request.course.id'}.'.extresource'});
401: if ($selected eq 'tab') {
402: $is_ext = 'tab';
403: $width = '';
404: $height = '';
405: } elsif ($selected eq 'window') {
406: $is_ext = 'window';
407: unless ($width =~ /^\d+$/) {
408: $width = '';
409: }
410: unless ($height =~ /^\d+$/) {
411: $height = '';
412: }
413: } else {
414: $width = '';
415: $height = '';
416: $reuse = '';
417: }
418: }
419: } elsif ($url =~ m{^/adm/($match_domain)/($match_courseid)/(\d+)/ext\.tool$}) {
420: $cdom = $1;
421: $cnum = $2;
422: my $marker = $3;
423: $exttool = 'iframe';
424: my $exttoolremote;
425: my %toolhash = &Apache::lonnet::get('exttool_'.$marker,['target','linktext','explanation','id','width','height'],
426: $cdom,$cnum);
427: if ($toolhash{'id'}) {
428: my %ltitools = &Apache::lonnet::get_domain_lti($cdom,'consumer');
429: if (ref($ltitools{$toolhash{'id'}}) eq 'HASH') {
430: $exttoolremote = $ltitools{$toolhash{'id'}}{'url'};
431: }
432: }
433: if ($toolhash{'target'} eq 'window') {
434: $exttool = 'window';
435: $width = $toolhash{'width'};
436: $height = $toolhash{'height'};
437: } elsif ($toolhash{'target'} eq 'tab') {
438: $exttool = 'tab';
439: }
440: if (($exttool eq 'window') || ($exttool eq 'tab')) {
441: $linktext = $toolhash{'linktext'};
442: $explanation = $toolhash{'explanation'};
443: } elsif (($exttoolremote =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
444: $exttool = 'tab';
445: }
446: }
447: if (($is_ext) || ($exttool)) {
448: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
449: ['forceedit','register','folderpath','symb','idx','title','anchor']);
450: if (($env{'form.forceedit'}) &&
451: (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
452: (($env{'form.folderpath'} =~ /^supplemental/) ||
453: ($env{'form.symb'} =~ /^uploaded/))) {
454: if ($env{'form.symb'}) {
455: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
456: if ($res =~ /(#[^#]+)$/) {
457: $url .= $1;
458: }
459: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
460: if ($env{'form.anchor'} ne '') {
461: $url .= '#'.$env{'form.anchor'};
462: }
463: $is_supp = 1;
464: }
465: my $type = 'ext';
466: if ($exttool) {
467: $type = 'tool';
468: } elsif (($url =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
469: $hostname = $r->hostname();
470: }
471: $r->print(
472: &Apache::lonextresedit::display_editor($url,$env{'form.folderpath'},
473: $env{'form.symb'},
474: $env{'form.idx'},$type,$cdom,
475: $cnum,$hostname));
476: return OK;
477: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
478: my $crstype = &Apache::loncommon::course_type();
479: my $title = $env{'form.title'};
480: if ($title eq '') {
481: if ($is_ext) {
482: $title = &mt('External Resource');
483: } else {
484: $title = &mt('External Tool');
485: }
486: }
487: $title = &HTML::Entities::encode($title,'\'"<>&');
488: $is_supp = 1;
489: if ($env{'request.course.id'}) {
490: $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
491: $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
492: &Apache::loncommon::validate_folderpath(1,'',$cnum,$cdom);
493: }
494: $brcrum =
495: &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
496: }
497: } elsif ($env{'request.course.id'}) {
498: my $courseurl = &Apache::lonnet::courseid_to_courseurl($env{'request.course.id'});
499: $courseurl =~ s{^/}{};
500: if ($url =~ m{^\Q/uploaded/$courseurl/supplemental/\E}) {
501: $is_supp = 1;
502: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
503: ['folderpath','title']);
504: if ($env{'form.folderpath'}) {
505: $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
506: $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
507: &Apache::loncommon::validate_folderpath(1,'',$cnum,$cdom);
508: }
509: my $title = $env{'form.title'};
510: $title = &HTML::Entities::encode($title,'\'"<>&');
511: my $crstype = &Apache::loncommon::course_type();
512: $brcrum =
513: &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
514:
515: }
516: }
517:
518: #
519: # Actual URL
520: #
521: if (($url=~/$LONCAPA::assess_re/) && (!$exttool)) {
522: #
523: # This is uploaded homework
524: #
525: $env{'request.state'}='uploaded';
526: &Apache::lonhomework::renderpage($r,$url);
527: } else {
528: #
529: # This is not homework
530: #
531: if (($is_ext) || ($exttool)) {
532: $absolute = $env{'request.use_absolute'};
533: $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
534: $ENV{'QUERY_STRING'} =~ s/\&$//;
535: }
536:
537: unless ($ENV{'QUERY_STRING'} eq '') {
538: $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
539: }
540:
541: # encrypt url if not external
542: unless ($is_ext) {
543: &Apache::lonenc::check_encrypt(\$url);
544: }
545:
546: $r->print( wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,
547: $linktext,$explanation,undef,$width,$height,$reuse,
548: $is_supp) );
549:
550: } # not just the menu
551:
552: return OK;
553: } # handler
554:
555: 1;
556: __END__
557:
558: =pod
559:
560: =head1 NAME
561:
562: Apache::lonwrapper - External and binary file management.
563:
564: =head1 SYNOPSIS
565:
566: Wrapper for external and binary files as standalone resources. Edit handler for rat maps; TeX content handler.
567:
568: This is part of the LearningOnline Network with CAPA project
569: described at http://www.lon-capa.org.
570:
571: =head1 Subroutines
572:
573: =over
574:
575: =item wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,$linktext,$explanation,$title,$width,$height,$reuse,$is_supp)
576:
577: =over
578:
579: =item $r
580:
581: request object
582:
583: =item $url
584:
585: url to display either by including in an iframe within a
586: LON-CAPA page which has a standard LON-CAPA inline menu,
587: or in some cases launched in a separate tab or window,
588: launched via a link in a LON-CAPA page with standard inline
589: menu.
590:
591: =item $brcrum
592:
593: breadcrumbs for unregistered urls
594: (i.e., external resources in Supplemental Content).
595:
596: =item $absolute
597:
598: contains protocol (http or https) followed by
599: the hostname, if menu items in the standard LON-CAPA
600: interface created by the call to loncommon::start_page()
601: within &wrapper() need to use absolute URLs rather than
602: relative URLs.
603:
604: That will be the case where an external resource has been
605: served from port 80, when the server customarily serves
606: requests using Apache/SSL (i.e., port 443). mod_rewrite
607: is used to switch requests for external resources and
608: the syllabus: /public/<domain>/<courseid>/syllabus
609: (which might also point at an external resource)
610: from https:// to http:// where the the URL of the remote site
611: specified in the resource itself is http://.
612:
613: This is done to avoid default mixed content blocking
614: in Firefox 23 and later, when serving from Apache/SSL.
615:
616: =item $is_ext
617:
618: true if URL is for an external resource. Default true value
619: is 1 (display in iframe, unless $uselink is true).
620: If external resource is to be displayed in a tab,
621: value of $is_ext will be tab, if to be displayed in a pop-up window,
622: value of $is_ext will be window.
623:
624: =item $is_pdf
625:
626: true if URL is for a PDF (based on file extension).
627:
628: =item $exttool
629:
630: If URL is for an External Tool, will contain the target type: iframe, window or tab.
631:
632: =item $linktext
633:
634: optional. If URL is for an External Tool, and target type is window or tab,
635: then the link text may be an option set in the course for each tool instance,
636: or may be a default defined in the domain for all instances of the tool.
637:
638: =item $explanation
639:
640: optional. If URL is for an External Tool, and target type is window or tab,
641: then the explanation is an option set in the course for each tool instance,
642: or may be a default defined in the domain for all instances of the tool.
643:
644: =item $title
645:
646: optional. If wrapped item is a PDF, and $clientmobile is true,
647: a link to a PDF is shown. The "title" will be displayed
648: above the link, but if not provided as an arg, $env{'form.title'}
649: will be used, otherwise, the filename will be displayed (unless
650: hidden URL set for the resource).
651:
652: =item $width
653:
654: optional. If URL is for an External Tool, and target type is window,
655: then a default width may have been defined in the domain for all instances of
656: the tool. If so, that width will be used for the window opened (via a link)
657: to launch the external tool. If the URL is for an External Resource, and
658: $is_ext is window, then a default width (px) may have been defined in the current
659: course for all external resource instances.
660:
661: =item $height
662:
663: optional. If URL is for an External Tool, and target type is window,
664: then a default height may have been defined in the domain for all instances of
665: the tool. If so, that height will be used for the window opened (via a link)
666: to launch the external tool. If the URL is for an External Resource, and
667: $is_ext is window, then a default height (px) may have been defined in the current
668: course for all external resource instances.
669:
670: =item $reuse
671:
672: optional. If the URL is for an External Resource, and $is_ext is tab or window,
673: then $reuse will be true if the same tab or window is to be reused for display
674: of all external resource instances in a a course.
675:
676: =back
677:
678: Returns markup for the entire page.
679:
680: =item handler()
681:
682: Content handler for requests for: /adm/wrapper/...
683: used for content to be displayed in an iframe, or launched in a separate tab
684: or window via a link. The target URL is extracted from the requested URL, by
685: removing the /adm/wrapper prefix.
686:
687: The target URL will typically be a PDF served from the current server, an
688: external resource URL served from a different server, or an external tool
689: (from an LTI Provider) launched from LON-CAPA (as LTI Consumer) and launched
690: via a link.
691:
692: If the request included forceedit in the query string, and the requester has
693: rights to modify course content, then the editor will be displayed to allow
694: changes to be made to the resource (e.g., change the URL of the external resource,
695: or change the setting for the external tool instance).
696:
697: If not in edit mode, then the wrapper() subroutine will be called to generate the
698: standard LON-CAPA inline menu, and then either a link to launch a separate tab or
699: window, or an iframe to display the content inline.
700:
701: =back
702:
703: =cut
704:
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