Annotation of rat/lonwrapper.pm, revision 1.73
1.1 www 1: # The LearningOnline Network with CAPA
2: # Wrapper for external and binary files as standalone resources
3: #
1.73 ! raeburn 4: # $Id: lonwrapper.pm,v 1.72 2020/02/16 21:57:49 raeburn Exp $
1.4 www 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: #
1.1 www 28:
1.29 jms 29:
1.1 www 30: package Apache::lonwrapper;
31:
32: use strict;
33: use Apache::Constants qw(:common);
1.38 droeschl 34: use Apache::lonenc();
1.18 albertel 35: use Apache::lonnet;
1.42 raeburn 36: use Apache::lonlocal;
37: use Apache::loncommon();
38: use Apache::lonhtmlcommon();
39: use Apache::lonextresedit();
1.50 raeburn 40: use Apache::lonexttool();
1.68 raeburn 41: use Apache::lonhomework();
1.64 raeburn 42: use LONCAPA qw(:DEFAULT :match);
43: use HTML::Entities();
1.1 www 44:
45: # ================================================================ Main Handler
1.21 albertel 46: sub wrapper {
1.69 raeburn 47: my ($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,$linktext,$explanation,
1.63 raeburn 48: $title,$width,$height) = @_;
1.23 albertel 49:
1.42 raeburn 50: my $forcereg;
51: unless ($env{'form.folderpath'}) {
52: $forcereg = 1;
53: }
1.46 raeburn 54: my %lt = &Apache::lonlocal::texthash(
55: 'noif' => 'No iframe support.',
56: 'show' => 'Show content in pop-up window',
57: );
58:
1.69 raeburn 59: my ($anchor,$uselink);
1.53 raeburn 60: if ($is_ext) {
61: if ($env{'form.symb'}) {
62: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
63: if ($res =~ /(#[^#]+)$/) {
64: $anchor = $1;
65: }
66: } elsif ($env{'form.anchor'} ne '') {
67: $anchor = '#'.$env{'form.anchor'};
1.51 raeburn 68: }
1.69 raeburn 69: unless (($is_pdf) && ($env{'browser.mobile'})) {
70: my $hostname = $r->hostname();
71: my $lonhost = $r->dir_config('lonHostID');
72: my $ip = &Apache::lonnet::get_host_ip($lonhost);
73: $uselink = &Apache::loncommon::is_nonframeable($url,$absolute,$hostname,$ip);
74: }
1.51 raeburn 75: }
76:
77: my $noiframe = &Apache::loncommon::modal_link($url.$anchor,$lt{'show'},500,400);
1.42 raeburn 78: my $args = {'bgcolor' => '#FFFFFF'};
79: if ($forcereg) {
80: $args->{'force_register'} = $forcereg;
81: }
82: if (ref($brcrum) eq 'ARRAY') {
1.45 raeburn 83: $args->{'bread_crumbs'} = $brcrum;
1.42 raeburn 84: }
1.44 raeburn 85: if ($absolute) {
1.57 raeburn 86: $args->{'use_absolute'} = $absolute;
1.44 raeburn 87: }
1.56 raeburn 88: if ($env{'form.only_body'}) {
89: $args->{'only_body'} = $env{'form.only_body'};
90: }
1.42 raeburn 91:
1.73 ! raeburn 92: my ($countdown,$donemsg,$headjs);
1.67 raeburn 93: if (($exttool) && (&Apache::lonnet::EXT('resource.0.gradable') =~ /^yes$/i)) {
94: $Apache::lonhomework::browse = &Apache::lonnet::allowed('bre',$url);
95: if ($env{'form.markaccess'}) {
1.68 raeburn 96: my $symb=&Apache::lonnet::symbread($url);
97: my @interval=&Apache::lonnet::EXT('resource.0.interval',$symb);
1.67 raeburn 98: my ($timelimit) = split(/_/,$interval[0]);
1.68 raeburn 99: my $setres = &Apache::lonnet::set_first_access($interval[1],$timelimit);
100: if ($setres eq 'ok') {
101: delete($env{'form.markaccess'});
102: }
103: } elsif ($env{'form.LC_interval_done'} eq 'true') {
104: my $symb=&Apache::lonnet::symbread($url);
105: if ($symb) {
106: (my $donebuttonresult,$donemsg) = &Apache::lonhomework::zero_timer($symb);
107: undef($env{'form.LC_interval_done'});
108: undef($env{'form.LC_interval_done_proctorpass'});
109: }
1.67 raeburn 110: }
111: my ($status,$result,$resource_due) =
112: &Apache::lonexttool::gradabletool_access_check();
113: undef($Apache::lonhomework::browse);
114: if ($status eq 'CAN_ANSWER') {
115: if ($resource_due) {
116: my $time_left = $resource_due - time();
117: if ($resource_due && ($time_left > 0)) {
118: $countdown ='
1.66 raeburn 119: <script type="text/javascript">
120: // <![CDATA['."\n".
121: &Apache::lonhtmlcommon::countdown().'
122: // ]]>
123: </script>'."\n".
1.67 raeburn 124: &Apache::lonhtmlcommon::set_due_date($resource_due);
125: }
1.66 raeburn 126: }
1.67 raeburn 127: } else {
128: if ($status eq 'SHOW_ANSWER') {
129: $result = &Apache::lonexttool::display_score().
130: &Apache::lonfeedback::list_discussion('tool','OPEN');
131: }
132: return &Apache::loncommon::start_page('Menu',undef,$args).
133: $result.
134: &Apache::loncommon::end_page();
1.66 raeburn 135: }
136: }
137:
1.73 ! raeburn 138: #
! 139: # Where iframe is in use, if window.onload() executes before the custom resize function
! 140: # has been defined (jQuery), two global javascript vars (LCnotready and LCresizedef)
! 141: # are used to ensure document.ready() triggers a call to resize, so the iframe contents
! 142: # do not obscure the Functions menu.
! 143: #
! 144:
! 145: unless (($env{'browser.mobile'}) || ($exttool eq 'window') || ($exttool eq 'tab') || $uselink) {
! 146: $headjs = '
! 147: <script type="text/javascript">
! 148: // <![CDATA[
! 149: var LCnotready = 0;
! 150: var LCresizedef = 0;
! 151: // ]]>
! 152: </script>'."\n";
! 153:
! 154: my $startpage = &Apache::loncommon::start_page('Menu',$headjs,$args).$countdown.$donemsg;
1.67 raeburn 155: my $endpage = &Apache::loncommon::end_page();
156:
1.69 raeburn 157: if (($uselink) && ($title eq '')) {
158: if ($env{'form.symb'}) {
159: $title=&Apache::lonnet::gettitle($env{'form.symb'});
160: } else {
161: my $symb=&Apache::lonnet::symbread($r->uri);
162: if ($symb) {
163: $title=&Apache::lonnet::gettitle($symb);
164: }
165: }
166: }
1.63 raeburn 167: if (($env{'browser.mobile'}) || ($exttool eq 'window') || ($exttool eq 'tab')) {
1.47 raeburn 168: my $output = $startpage;
169: if ($is_pdf) {
1.69 raeburn 170: $linktext = &mt('Link to PDF (for mobile devices)');
171: $output .= &create_link($url,$anchor,$title,$linktext);
1.63 raeburn 172: } elsif (($exttool eq 'window') || ($exttool eq 'tab')) {
1.60 raeburn 173: if ($linktext eq '') {
174: $linktext = &mt('Launch External Tool');
175: }
1.64 raeburn 176: $url = &HTML::Entities::encode($url,'"<>&');
1.63 raeburn 177: if ($exttool eq 'tab') {
178: $output .= '<div>'.
179: '<a href="'.$url.'" target="LCExternalToolTab" style="padding:0;clear:both;margin:0;border:0">'.
180: $linktext.'</a>'.
181: '</div>';
182: } else {
183: $output .= <<"ENDLINK";
184: <script type="text/javascript">
1.64 raeburn 185: // <![CDATA[
1.70 raeburn 186: var windowObjectReference = null;
187: var PreviousUrl;
188:
1.63 raeburn 189: function openSinglePopup(strUrl) {
190: if (windowObjectReference == null || windowObjectReference.closed) {
191: windowObjectReference = window.open(strUrl, "LCExternalToolPopUp",
192: "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
193: } else if(PreviousUrl != strUrl) {
194: windowObjectReference = window.open(strUrl, "LCExternalToolPopUp",
195: "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
196: windowObjectReference.focus();
197: } else {
198: windowObjectReference.focus();
199: };
200: PreviousUrl = strUrl;
201: }
1.64 raeburn 202: // ]]>
1.63 raeburn 203: </script>
204: <div>
205: <a href="$url" target="LCExternalToolPopUp" onclick="openSinglePopup(this.href); return false;">
206: $linktext</a>
207: </div>
208: ENDLINK
209: }
1.60 raeburn 210: if ($explanation ne '') {
211: $output .= '<div>'.$explanation.'</div>';
212: }
1.66 raeburn 213: if (&Apache::lonnet::EXT('resource.0.gradable')) {
214: $output .= &Apache::lonfeedback::list_discussion('tool','OPEN');
215: }
1.47 raeburn 216: } else {
1.69 raeburn 217: if ($uselink) {
218: $linktext = &mt('Link to resource');
219: $output .= &create_link($url,$anchor,$title,$linktext);
220: } else {
221: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
222: $output .= '<div style="overflow:scroll; -webkit-overflow-scrolling:touch;">'."\n".
223: '<iframe src="'.$dest.'" height="100%" width="100%" frameborder="0">'."\n".
224: "$lt{'noif'} $noiframe\n".
225: "</iframe>\n".
226: "</div>\n";
227: }
1.47 raeburn 228: }
229: $output .= $endpage;
230: return $output;
1.69 raeburn 231: } elsif ($uselink) {
232: $linktext = &mt('Link to resource');
233: return $startpage.&create_link($url,$anchor,$title,$linktext).$endpage;
1.46 raeburn 234: } else {
1.55 raeburn 235: my $offset = 5;
236: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['inhibitmenu']);
237: if ($env{'form.inhibitmenu'} eq 'yes') {
238: $offset = 0;
239: }
1.46 raeburn 240: my $script = &Apache::lonhtmlcommon::scripttag(<<SCRIPT);
241: \$(document).ready( function() {
242: \$(window).unbind('resize').resize(function(){
1.54 damieng 243: var header = null;
1.55 raeburn 244: var offset = $offset;
1.46 raeburn 245: var height = 0;
246: var hdrtop = 0;
247: if (\$('div.LC_head_subbox:first').length) {
248: header = \$('div.LC_head_subbox:first');
249: offset = 9;
250: } else {
251: if (\$('#LC_breadcrumbs').length) {
252: header = \$('#LC_breadcrumbs');
253: }
254: }
1.54 damieng 255: if (header != null && header.length) {
1.46 raeburn 256: height = header.height();
257: hdrtop = header.position().top;
1.42 raeburn 258: }
1.46 raeburn 259: var pos = height + hdrtop + offset;
260: \$('.LC_iframecontainer').css('top', pos);
261: });
1.73 ! raeburn 262: LCresizedef = 1;
! 263: if (LCnotready == 1) {
! 264: LCnotready = 0;
! 265: \$(window).trigger('resize');
! 266: }
1.38 droeschl 267: });
1.73 ! raeburn 268: window.onload = function(){
! 269: if (LCresizedef) {
! 270: LCnotready = 0;
! 271: \$(window).trigger('resize') };
! 272: } else {
! 273: LCnotready = 1;
! 274: }
! 275: };
1.39 droeschl 276: SCRIPT
1.46 raeburn 277: # javascript will position the iframe if window was resized (or zoomed)
1.64 raeburn 278: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
1.46 raeburn 279: return <<ENDFRAME;
280: $startpage
281: $script
282: <div class="LC_iframecontainer">
1.64 raeburn 283: <iframe src="$dest">$lt{'noif'} $noiframe</iframe>
1.46 raeburn 284: </div>
285: $endpage
1.38 droeschl 286: ENDFRAME
1.46 raeburn 287: }
1.21 albertel 288: }
289:
1.69 raeburn 290: sub create_link {
291: my ($url,$anchor,$title,$linktext) = @_;
292: my $shownlink;
293: if ($title eq '') {
294: $title = $env{'form.title'};
295: if ($title eq '') {
296: unless ($env{'request.enc'}) {
297: ($title) = ($url =~ m{/([^/]+)$});
298: $title =~ s/(\?[^\?]+)$//;
299: }
300: }
301: }
302: unless ($title eq '') {
303: $shownlink = '<span style="font-weight:bold;">'.$title.'</span><br />';
304: }
305: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
306: $shownlink .= '<a href="'.$dest.'">'.$linktext.'</a>';
307: return $shownlink;
308: }
309:
1.21 albertel 310: sub handler {
311: my $r=shift;
312: &Apache::loncommon::content_type($r,'text/html');
313: $r->send_http_header;
314:
315: return OK if $r->header_only;
316:
1.38 droeschl 317: my $url = $r->uri;
1.60 raeburn 318: my ($is_ext,$brcrum,$absolute,$is_pdf,$exttool,$cdom,$cnum,$hostname,
1.63 raeburn 319: $linktext,$explanation,$width,$height);
1.38 droeschl 320:
321: for ($url){
322: s|^/adm/wrapper||;
1.73 ! raeburn 323: $is_ext = $_ =~ s|^/ext/|http://|;
1.72 raeburn 324: s|http://https://?|https://| if ($is_ext);
1.70 raeburn 325: s|:|:|g;
1.21 albertel 326: }
327:
1.47 raeburn 328: if ($url =~ /\.pdf$/i) {
329: $is_pdf = 1;
1.62 raeburn 330: } elsif ($url =~ m{^/adm/($match_domain)/($match_courseid)/(\d+)/ext\.tool$}) {
1.50 raeburn 331: $cdom = $1;
332: $cnum = $2;
333: my $marker = $3;
334: $exttool = 'iframe';
1.61 raeburn 335: my $exttoolremote;
1.63 raeburn 336: my %toolhash = &Apache::lonnet::get('exttool_'.$marker,['target','linktext','explanation','id','width','height'],
1.60 raeburn 337: $cdom,$cnum);
1.61 raeburn 338: if ($toolhash{'id'}) {
1.65 raeburn 339: my %ltitools = &Apache::lonnet::get_domain_lti($cdom,'consumer');
1.61 raeburn 340: if (ref($ltitools{$toolhash{'id'}}) eq 'HASH') {
341: $exttoolremote = $ltitools{$toolhash{'id'}}{'url'};
342: }
343: }
1.50 raeburn 344: if ($toolhash{'target'} eq 'window') {
1.63 raeburn 345: $exttool = 'window';
346: $width = $toolhash{'width'};
347: $height = $toolhash{'height'};
348: } elsif ($toolhash{'target'} eq 'tab') {
1.70 raeburn 349: $exttool = 'tab';
1.63 raeburn 350: }
351: if (($exttool eq 'window') || ($exttool eq 'tab')) {
1.70 raeburn 352: $linktext = $toolhash{'linktext'};
1.60 raeburn 353: $explanation = $toolhash{'explanation'};
1.61 raeburn 354: } elsif (($exttoolremote =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
1.63 raeburn 355: $exttool = 'tab';
1.50 raeburn 356: }
1.47 raeburn 357: }
1.50 raeburn 358: if (($is_ext) || ($exttool)) {
1.42 raeburn 359: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1.53 raeburn 360: ['forceedit','register','folderpath','symb','idx','title','anchor']);
1.42 raeburn 361: if (($env{'form.forceedit'}) &&
362: (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
363: (($env{'form.folderpath'} =~ /^supplemental/) ||
364: ($env{'form.symb'} =~ /^uploaded/))) {
1.53 raeburn 365: if ($env{'form.symb'}) {
366: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
367: if ($res =~ /(#[^#]+)$/) {
368: $url .= $1;
369: }
370: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
371: if ($env{'form.anchor'} ne '') {
372: $url .= '#'.$env{'form.anchor'};
373: }
1.52 raeburn 374: }
1.50 raeburn 375: my $type = 'ext';
376: if ($exttool) {
377: $type = 'tool';
1.58 raeburn 378: } elsif (($url =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
379: $hostname = $r->hostname();
1.50 raeburn 380: }
1.42 raeburn 381: $r->print(
382: &Apache::lonextresedit::display_editor($url,$env{'form.folderpath'},
383: $env{'form.symb'},
1.50 raeburn 384: $env{'form.idx'},$type,$cdom,
1.58 raeburn 385: $cnum,$hostname));
1.42 raeburn 386: return OK;
387: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
388: my $crstype = &Apache::loncommon::course_type();
1.43 raeburn 389: my $title = $env{'form.title'};
390: if ($title eq '') {
1.50 raeburn 391: if ($is_ext) {
392: $title = &mt('External Resource');
393: } else {
394: $title = &mt('External Tool');
395: }
1.43 raeburn 396: }
1.42 raeburn 397: $brcrum =
1.43 raeburn 398: &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
1.42 raeburn 399: }
400: }
401:
1.21 albertel 402: #
403: # Actual URL
404: #
1.62 raeburn 405: if (($url=~/$LONCAPA::assess_re/) && (!$exttool)) {
1.21 albertel 406: #
407: # This is uploaded homework
408: #
1.38 droeschl 409: $env{'request.state'}='uploaded';
410: &Apache::lonhomework::renderpage($r,$url);
1.21 albertel 411: } else {
412: #
413: # This is not homework
414: #
1.50 raeburn 415: if (($is_ext) || ($exttool)) {
1.49 raeburn 416: $absolute = $env{'request.use_absolute'};
1.38 droeschl 417: $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
1.42 raeburn 418: $ENV{'QUERY_STRING'} =~ s/\&$//;
1.38 droeschl 419: }
420:
1.35 raeburn 421: unless ($ENV{'QUERY_STRING'} eq '') {
1.38 droeschl 422: $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
1.35 raeburn 423: }
1.38 droeschl 424:
425: # encrypt url if not external
1.59 raeburn 426: unless ($is_ext) {
1.50 raeburn 427: &Apache::lonenc::check_encrypt(\$url);
428: }
1.38 droeschl 429:
1.69 raeburn 430: $r->print( wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,
1.63 raeburn 431: $linktext,$explanation,undef,$width,$height) );
1.38 droeschl 432:
1.21 albertel 433: } # not just the menu
1.38 droeschl 434:
1.21 albertel 435: return OK;
1.13 www 436: } # handler
1.1 www 437:
438: 1;
439: __END__
440:
1.30 jms 441: =pod
1.1 www 442:
1.30 jms 443: =head1 NAME
444:
445: Apache::lonwrapper - External and binary file management.
446:
447: =head1 SYNOPSIS
448:
449: Wrapper for external and binary files as standalone resources. Edit handler for rat maps; TeX content handler.
450:
451: This is part of the LearningOnline Network with CAPA project
452: described at http://www.lon-capa.org.
453:
454: =head1 Subroutines
455:
456: =over
457:
1.71 raeburn 458: =item wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,$linktext,$explanation,$title,$width,$height)
1.30 jms 459:
1.45 raeburn 460: =over
461:
1.69 raeburn 462: =item $r
463:
464: request object
465:
1.46 raeburn 466: =item $url
467:
1.71 raeburn 468: url to display either by including in an iframe within a
469: LON-CAPA page which has a standard LON-CAPA inline menu,
470: or in some cases launched in a separate tab or window,
471: launched via a link in a LON-CAPA page with standard inline
472: menu.
1.45 raeburn 473:
474: =item $brcrum
475:
476: breadcrumbs for unregistered urls
1.42 raeburn 477: (i.e., external resources in Supplemental Content).
1.45 raeburn 478:
1.46 raeburn 479: =item $absolute
1.45 raeburn 480:
481: contains protocol (http or https) followed by
482: the hostname, if menu items in the standard LON-CAPA
483: interface created by the call to loncommon::start_page()
484: within &wrapper() need to use absolute URLs rather than
485: relative URLs.
486:
487: That will be the case where an external resource has been
488: served from port 80, when the server customarily serves
489: requests using Apache/SSL (i.e., port 443). mod_rewrite
1.49 raeburn 490: is used to switch requests for external resources and
491: the syllabus: /public/<domain>/<courseid>/syllabus
492: (which might also point at an external resource)
1.45 raeburn 493: from https:// to http:// where the the URL of the remote site
494: specified in the resource itself is http://.
495:
496: This is done to avoid default mixed content blocking
497: in Firefox 23 and later, when serving from Apache/SSL.
498:
499: =item $is_ext
500:
501: true if URL is for an external resource.
502:
1.47 raeburn 503: =item $is_pdf
504:
505: true if URL is for a PDF (based on file extension).
506:
1.71 raeburn 507: =item $exttool
508:
509: If URL is for an External Tool, will contain the target type: iframe, window or tab.
510:
511: =item $linktext
512:
513: optional. If URL is for an External Tool, and target type is window or tab,
514: then the link text may be an option set in the course for each tool instance,
515: or may be a default defined in the domain for all instances of the tool.
516:
517: =item $explanation
518:
519: optional. If URL is for an External Tool, and target type is window or tab,
520: then the explanation is an option set in the course for each tool instance,
521: or may be a default defined in the domain for all instances of the tool.
522:
1.49 raeburn 523: =item $title
524:
525: optional. If wrapped item is a PDF, and $env{'browser.mobile'}
526: is true, a link to a PDF is shown. The "title" will be displayed
527: above the link, but if not provided as an arg, $env{'form.title'}
528: will be used, otherwise, the filename will be displayed (unless
529: hidden URL set for the resource).
530:
1.71 raeburn 531: =item $width
532:
533: optional. If URL is for an External Tool, and target type is window,
534: then a default width may have been defined in the domain for all instances of
535: the tool. If so, that width will be used for the window opened (via a link)
536: to launch the external tool.
537:
538: =item $height
539:
540: optional. If URL is for an External Tool, and target type is window,
541: then a default height may have been defined in the domain for all instances of
542: the tool. If so, that height will be used for the window opened (via a link)
543: to launch the external tool.
544:
1.45 raeburn 545: =back
546:
1.38 droeschl 547: Returns markup for the entire page.
1.30 jms 548:
549: =item handler()
550:
1.71 raeburn 551: Content handler for requests for: /adm/wrapper/...
552: used for content to be displayed in an iframe, or launched in a separate tab
553: or window via a link. The target URL is extracted from the requested URL, by
554: removing the /adm/wrapper prefix.
555:
556: The target URL will typically be a PDF served from the current server, an
557: external resource URL served from a different server, or an external tool
558: (from an LTI Provider) launched from LON-CAPA (as LTI Consumer) and launched
559: via a link.
560:
561: If the request included forceedit in the query string, and the requester has
562: rights to modify course content, then the editor will be didplayed to allow
563: changes to be made to the resource (e.g., change the URL of the external resource,
564: or change the setting for the external tool instance.
565:
566: If not in edit mode, then the wrapper() subroutine will be called to generate the
567: standard LON-CAPA inline menu, and then either a link to launch a separate tab or
568: window, or an iframe to display the content inline.
569:
1.30 jms 570: =back
571:
572: =cut
1.1 www 573:
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