Annotation of rat/lonwrapper.pm, revision 1.77
1.1 www 1: # The LearningOnline Network with CAPA
2: # Wrapper for external and binary files as standalone resources
3: #
1.77 ! raeburn 4: # $Id: lonwrapper.pm,v 1.76 2020/02/29 16:05:26 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:
1.77 ! raeburn 59: (undef,undef,undef,undef,undef,undef,my $clientmobile) =
! 60: &Apache::loncommon::decode_user_agent($r);
! 61:
1.69 raeburn 62: my ($anchor,$uselink);
1.53 raeburn 63: if ($is_ext) {
64: if ($env{'form.symb'}) {
65: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
66: if ($res =~ /(#[^#]+)$/) {
67: $anchor = $1;
68: }
69: } elsif ($env{'form.anchor'} ne '') {
70: $anchor = '#'.$env{'form.anchor'};
1.51 raeburn 71: }
1.77 ! raeburn 72: unless (($is_pdf) && ($clientmobile)) {
1.69 raeburn 73: my $hostname = $r->hostname();
74: my $lonhost = $r->dir_config('lonHostID');
75: my $ip = &Apache::lonnet::get_host_ip($lonhost);
76: $uselink = &Apache::loncommon::is_nonframeable($url,$absolute,$hostname,$ip);
77: }
1.51 raeburn 78: }
79:
80: my $noiframe = &Apache::loncommon::modal_link($url.$anchor,$lt{'show'},500,400);
1.42 raeburn 81: my $args = {'bgcolor' => '#FFFFFF'};
82: if ($forcereg) {
83: $args->{'force_register'} = $forcereg;
84: }
85: if (ref($brcrum) eq 'ARRAY') {
1.45 raeburn 86: $args->{'bread_crumbs'} = $brcrum;
1.42 raeburn 87: }
1.44 raeburn 88: if ($absolute) {
1.57 raeburn 89: $args->{'use_absolute'} = $absolute;
1.44 raeburn 90: }
1.56 raeburn 91: if ($env{'form.only_body'}) {
92: $args->{'only_body'} = $env{'form.only_body'};
93: }
1.42 raeburn 94:
1.73 raeburn 95: my ($countdown,$donemsg,$headjs);
1.67 raeburn 96: if (($exttool) && (&Apache::lonnet::EXT('resource.0.gradable') =~ /^yes$/i)) {
97: $Apache::lonhomework::browse = &Apache::lonnet::allowed('bre',$url);
98: if ($env{'form.markaccess'}) {
1.68 raeburn 99: my $symb=&Apache::lonnet::symbread($url);
100: my @interval=&Apache::lonnet::EXT('resource.0.interval',$symb);
1.67 raeburn 101: my ($timelimit) = split(/_/,$interval[0]);
1.68 raeburn 102: my $setres = &Apache::lonnet::set_first_access($interval[1],$timelimit);
103: if ($setres eq 'ok') {
104: delete($env{'form.markaccess'});
105: }
106: } elsif ($env{'form.LC_interval_done'} eq 'true') {
107: my $symb=&Apache::lonnet::symbread($url);
108: if ($symb) {
109: (my $donebuttonresult,$donemsg) = &Apache::lonhomework::zero_timer($symb);
110: undef($env{'form.LC_interval_done'});
111: undef($env{'form.LC_interval_done_proctorpass'});
112: }
1.67 raeburn 113: }
114: my ($status,$result,$resource_due) =
115: &Apache::lonexttool::gradabletool_access_check();
116: undef($Apache::lonhomework::browse);
117: if ($status eq 'CAN_ANSWER') {
118: if ($resource_due) {
119: my $time_left = $resource_due - time();
120: if ($resource_due && ($time_left > 0)) {
121: $countdown ='
1.66 raeburn 122: <script type="text/javascript">
123: // <![CDATA['."\n".
124: &Apache::lonhtmlcommon::countdown().'
125: // ]]>
126: </script>'."\n".
1.67 raeburn 127: &Apache::lonhtmlcommon::set_due_date($resource_due);
128: }
1.66 raeburn 129: }
1.67 raeburn 130: } else {
131: if ($status eq 'SHOW_ANSWER') {
132: $result = &Apache::lonexttool::display_score().
133: &Apache::lonfeedback::list_discussion('tool','OPEN');
134: }
135: return &Apache::loncommon::start_page('Menu',undef,$args).
136: $result.
137: &Apache::loncommon::end_page();
1.66 raeburn 138: }
139: }
140:
1.73 raeburn 141: #
142: # Where iframe is in use, if window.onload() executes before the custom resize function
143: # has been defined (jQuery), two global javascript vars (LCnotready and LCresizedef)
144: # are used to ensure document.ready() triggers a call to resize, so the iframe contents
145: # do not obscure the Functions menu.
146: #
147:
1.77 ! raeburn 148: unless ($clientmobile || ($exttool eq 'window') || ($exttool eq 'tab') || $uselink) {
1.73 raeburn 149: $headjs = '
150: <script type="text/javascript">
151: // <![CDATA[
152: var LCnotready = 0;
153: var LCresizedef = 0;
154: // ]]>
155: </script>'."\n";
1.74 raeburn 156: }
1.73 raeburn 157:
158: my $startpage = &Apache::loncommon::start_page('Menu',$headjs,$args).$countdown.$donemsg;
1.67 raeburn 159: my $endpage = &Apache::loncommon::end_page();
160:
1.69 raeburn 161: if (($uselink) && ($title eq '')) {
162: if ($env{'form.symb'}) {
163: $title=&Apache::lonnet::gettitle($env{'form.symb'});
164: } else {
165: my $symb=&Apache::lonnet::symbread($r->uri);
166: if ($symb) {
167: $title=&Apache::lonnet::gettitle($symb);
168: }
169: }
170: }
1.77 ! raeburn 171: if ($clientmobile || ($exttool eq 'window') || ($exttool eq 'tab')) {
1.47 raeburn 172: my $output = $startpage;
173: if ($is_pdf) {
1.69 raeburn 174: $linktext = &mt('Link to PDF (for mobile devices)');
175: $output .= &create_link($url,$anchor,$title,$linktext);
1.63 raeburn 176: } elsif (($exttool eq 'window') || ($exttool eq 'tab')) {
1.60 raeburn 177: if ($linktext eq '') {
178: $linktext = &mt('Launch External Tool');
179: }
1.64 raeburn 180: $url = &HTML::Entities::encode($url,'"<>&');
1.63 raeburn 181: if ($exttool eq 'tab') {
182: $output .= '<div>'.
183: '<a href="'.$url.'" target="LCExternalToolTab" style="padding:0;clear:both;margin:0;border:0">'.
184: $linktext.'</a>'.
185: '</div>';
186: } else {
187: $output .= <<"ENDLINK";
188: <script type="text/javascript">
1.64 raeburn 189: // <![CDATA[
1.70 raeburn 190: var windowObjectReference = null;
191: var PreviousUrl;
192:
1.63 raeburn 193: function openSinglePopup(strUrl) {
194: if (windowObjectReference == null || windowObjectReference.closed) {
195: windowObjectReference = window.open(strUrl, "LCExternalToolPopUp",
196: "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
197: } else if(PreviousUrl != strUrl) {
198: windowObjectReference = window.open(strUrl, "LCExternalToolPopUp",
199: "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
200: windowObjectReference.focus();
201: } else {
202: windowObjectReference.focus();
203: };
204: PreviousUrl = strUrl;
205: }
1.64 raeburn 206: // ]]>
1.63 raeburn 207: </script>
208: <div>
209: <a href="$url" target="LCExternalToolPopUp" onclick="openSinglePopup(this.href); return false;">
210: $linktext</a>
211: </div>
212: ENDLINK
213: }
1.60 raeburn 214: if ($explanation ne '') {
215: $output .= '<div>'.$explanation.'</div>';
216: }
1.66 raeburn 217: if (&Apache::lonnet::EXT('resource.0.gradable')) {
218: $output .= &Apache::lonfeedback::list_discussion('tool','OPEN');
219: }
1.47 raeburn 220: } else {
1.69 raeburn 221: if ($uselink) {
222: $linktext = &mt('Link to resource');
223: $output .= &create_link($url,$anchor,$title,$linktext);
224: } else {
225: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
226: $output .= '<div style="overflow:scroll; -webkit-overflow-scrolling:touch;">'."\n".
227: '<iframe src="'.$dest.'" height="100%" width="100%" frameborder="0">'."\n".
228: "$lt{'noif'} $noiframe\n".
229: "</iframe>\n".
230: "</div>\n";
231: }
1.47 raeburn 232: }
233: $output .= $endpage;
234: return $output;
1.69 raeburn 235: } elsif ($uselink) {
236: $linktext = &mt('Link to resource');
237: return $startpage.&create_link($url,$anchor,$title,$linktext).$endpage;
1.46 raeburn 238: } else {
1.55 raeburn 239: my $offset = 5;
240: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['inhibitmenu']);
241: if ($env{'form.inhibitmenu'} eq 'yes') {
242: $offset = 0;
243: }
1.46 raeburn 244: my $script = &Apache::lonhtmlcommon::scripttag(<<SCRIPT);
245: \$(document).ready( function() {
246: \$(window).unbind('resize').resize(function(){
1.54 damieng 247: var header = null;
1.55 raeburn 248: var offset = $offset;
1.46 raeburn 249: var height = 0;
250: var hdrtop = 0;
251: if (\$('div.LC_head_subbox:first').length) {
252: header = \$('div.LC_head_subbox:first');
253: offset = 9;
254: } else {
255: if (\$('#LC_breadcrumbs').length) {
256: header = \$('#LC_breadcrumbs');
257: }
258: }
1.54 damieng 259: if (header != null && header.length) {
1.46 raeburn 260: height = header.height();
261: hdrtop = header.position().top;
1.42 raeburn 262: }
1.46 raeburn 263: var pos = height + hdrtop + offset;
264: \$('.LC_iframecontainer').css('top', pos);
265: });
1.73 raeburn 266: LCresizedef = 1;
267: if (LCnotready == 1) {
268: LCnotready = 0;
269: \$(window).trigger('resize');
270: }
1.38 droeschl 271: });
1.73 raeburn 272: window.onload = function(){
273: if (LCresizedef) {
274: LCnotready = 0;
1.75 raeburn 275: \$(window).trigger('resize');
1.73 raeburn 276: } else {
277: LCnotready = 1;
278: }
279: };
1.39 droeschl 280: SCRIPT
1.46 raeburn 281: # javascript will position the iframe if window was resized (or zoomed)
1.64 raeburn 282: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
1.46 raeburn 283: return <<ENDFRAME;
284: $startpage
285: $script
286: <div class="LC_iframecontainer">
1.64 raeburn 287: <iframe src="$dest">$lt{'noif'} $noiframe</iframe>
1.46 raeburn 288: </div>
289: $endpage
1.38 droeschl 290: ENDFRAME
1.46 raeburn 291: }
1.21 albertel 292: }
293:
1.69 raeburn 294: sub create_link {
295: my ($url,$anchor,$title,$linktext) = @_;
296: my $shownlink;
297: if ($title eq '') {
298: $title = $env{'form.title'};
299: if ($title eq '') {
300: unless ($env{'request.enc'}) {
301: ($title) = ($url =~ m{/([^/]+)$});
302: $title =~ s/(\?[^\?]+)$//;
303: }
304: }
305: }
306: unless ($title eq '') {
307: $shownlink = '<span style="font-weight:bold;">'.$title.'</span><br />';
308: }
309: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
310: $shownlink .= '<a href="'.$dest.'">'.$linktext.'</a>';
311: return $shownlink;
312: }
313:
1.21 albertel 314: sub handler {
315: my $r=shift;
316: &Apache::loncommon::content_type($r,'text/html');
317: $r->send_http_header;
318:
319: return OK if $r->header_only;
320:
1.38 droeschl 321: my $url = $r->uri;
1.60 raeburn 322: my ($is_ext,$brcrum,$absolute,$is_pdf,$exttool,$cdom,$cnum,$hostname,
1.63 raeburn 323: $linktext,$explanation,$width,$height);
1.38 droeschl 324:
325: for ($url){
326: s|^/adm/wrapper||;
1.73 raeburn 327: $is_ext = $_ =~ s|^/ext/|http://|;
1.76 raeburn 328: s|http://https://|https://| if ($is_ext);
1.70 raeburn 329: s|:|:|g;
1.21 albertel 330: }
331:
1.47 raeburn 332: if ($url =~ /\.pdf$/i) {
333: $is_pdf = 1;
1.62 raeburn 334: } elsif ($url =~ m{^/adm/($match_domain)/($match_courseid)/(\d+)/ext\.tool$}) {
1.50 raeburn 335: $cdom = $1;
336: $cnum = $2;
337: my $marker = $3;
338: $exttool = 'iframe';
1.61 raeburn 339: my $exttoolremote;
1.63 raeburn 340: my %toolhash = &Apache::lonnet::get('exttool_'.$marker,['target','linktext','explanation','id','width','height'],
1.60 raeburn 341: $cdom,$cnum);
1.61 raeburn 342: if ($toolhash{'id'}) {
1.65 raeburn 343: my %ltitools = &Apache::lonnet::get_domain_lti($cdom,'consumer');
1.61 raeburn 344: if (ref($ltitools{$toolhash{'id'}}) eq 'HASH') {
345: $exttoolremote = $ltitools{$toolhash{'id'}}{'url'};
346: }
347: }
1.50 raeburn 348: if ($toolhash{'target'} eq 'window') {
1.63 raeburn 349: $exttool = 'window';
350: $width = $toolhash{'width'};
351: $height = $toolhash{'height'};
352: } elsif ($toolhash{'target'} eq 'tab') {
1.70 raeburn 353: $exttool = 'tab';
1.63 raeburn 354: }
355: if (($exttool eq 'window') || ($exttool eq 'tab')) {
1.70 raeburn 356: $linktext = $toolhash{'linktext'};
1.60 raeburn 357: $explanation = $toolhash{'explanation'};
1.61 raeburn 358: } elsif (($exttoolremote =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
1.63 raeburn 359: $exttool = 'tab';
1.50 raeburn 360: }
1.47 raeburn 361: }
1.50 raeburn 362: if (($is_ext) || ($exttool)) {
1.42 raeburn 363: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1.53 raeburn 364: ['forceedit','register','folderpath','symb','idx','title','anchor']);
1.42 raeburn 365: if (($env{'form.forceedit'}) &&
366: (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
367: (($env{'form.folderpath'} =~ /^supplemental/) ||
368: ($env{'form.symb'} =~ /^uploaded/))) {
1.53 raeburn 369: if ($env{'form.symb'}) {
370: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
371: if ($res =~ /(#[^#]+)$/) {
372: $url .= $1;
373: }
374: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
375: if ($env{'form.anchor'} ne '') {
376: $url .= '#'.$env{'form.anchor'};
377: }
1.52 raeburn 378: }
1.50 raeburn 379: my $type = 'ext';
380: if ($exttool) {
381: $type = 'tool';
1.58 raeburn 382: } elsif (($url =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
383: $hostname = $r->hostname();
1.50 raeburn 384: }
1.42 raeburn 385: $r->print(
386: &Apache::lonextresedit::display_editor($url,$env{'form.folderpath'},
387: $env{'form.symb'},
1.50 raeburn 388: $env{'form.idx'},$type,$cdom,
1.58 raeburn 389: $cnum,$hostname));
1.42 raeburn 390: return OK;
391: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
392: my $crstype = &Apache::loncommon::course_type();
1.43 raeburn 393: my $title = $env{'form.title'};
394: if ($title eq '') {
1.50 raeburn 395: if ($is_ext) {
396: $title = &mt('External Resource');
397: } else {
398: $title = &mt('External Tool');
399: }
1.43 raeburn 400: }
1.42 raeburn 401: $brcrum =
1.43 raeburn 402: &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
1.42 raeburn 403: }
404: }
405:
1.21 albertel 406: #
407: # Actual URL
408: #
1.62 raeburn 409: if (($url=~/$LONCAPA::assess_re/) && (!$exttool)) {
1.21 albertel 410: #
411: # This is uploaded homework
412: #
1.38 droeschl 413: $env{'request.state'}='uploaded';
414: &Apache::lonhomework::renderpage($r,$url);
1.21 albertel 415: } else {
416: #
417: # This is not homework
418: #
1.50 raeburn 419: if (($is_ext) || ($exttool)) {
1.49 raeburn 420: $absolute = $env{'request.use_absolute'};
1.38 droeschl 421: $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
1.42 raeburn 422: $ENV{'QUERY_STRING'} =~ s/\&$//;
1.38 droeschl 423: }
424:
1.35 raeburn 425: unless ($ENV{'QUERY_STRING'} eq '') {
1.38 droeschl 426: $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
1.35 raeburn 427: }
1.38 droeschl 428:
429: # encrypt url if not external
1.59 raeburn 430: unless ($is_ext) {
1.50 raeburn 431: &Apache::lonenc::check_encrypt(\$url);
432: }
1.38 droeschl 433:
1.69 raeburn 434: $r->print( wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,
1.63 raeburn 435: $linktext,$explanation,undef,$width,$height) );
1.38 droeschl 436:
1.21 albertel 437: } # not just the menu
1.38 droeschl 438:
1.21 albertel 439: return OK;
1.13 www 440: } # handler
1.1 www 441:
442: 1;
443: __END__
444:
1.30 jms 445: =pod
1.1 www 446:
1.30 jms 447: =head1 NAME
448:
449: Apache::lonwrapper - External and binary file management.
450:
451: =head1 SYNOPSIS
452:
453: Wrapper for external and binary files as standalone resources. Edit handler for rat maps; TeX content handler.
454:
455: This is part of the LearningOnline Network with CAPA project
456: described at http://www.lon-capa.org.
457:
458: =head1 Subroutines
459:
460: =over
461:
1.71 raeburn 462: =item wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,$linktext,$explanation,$title,$width,$height)
1.30 jms 463:
1.45 raeburn 464: =over
465:
1.69 raeburn 466: =item $r
467:
468: request object
469:
1.46 raeburn 470: =item $url
471:
1.71 raeburn 472: url to display either by including in an iframe within a
473: LON-CAPA page which has a standard LON-CAPA inline menu,
474: or in some cases launched in a separate tab or window,
475: launched via a link in a LON-CAPA page with standard inline
476: menu.
1.45 raeburn 477:
478: =item $brcrum
479:
480: breadcrumbs for unregistered urls
1.42 raeburn 481: (i.e., external resources in Supplemental Content).
1.45 raeburn 482:
1.46 raeburn 483: =item $absolute
1.45 raeburn 484:
485: contains protocol (http or https) followed by
486: the hostname, if menu items in the standard LON-CAPA
487: interface created by the call to loncommon::start_page()
488: within &wrapper() need to use absolute URLs rather than
489: relative URLs.
490:
491: That will be the case where an external resource has been
492: served from port 80, when the server customarily serves
493: requests using Apache/SSL (i.e., port 443). mod_rewrite
1.49 raeburn 494: is used to switch requests for external resources and
495: the syllabus: /public/<domain>/<courseid>/syllabus
496: (which might also point at an external resource)
1.45 raeburn 497: from https:// to http:// where the the URL of the remote site
498: specified in the resource itself is http://.
499:
500: This is done to avoid default mixed content blocking
501: in Firefox 23 and later, when serving from Apache/SSL.
502:
503: =item $is_ext
504:
505: true if URL is for an external resource.
506:
1.47 raeburn 507: =item $is_pdf
508:
509: true if URL is for a PDF (based on file extension).
510:
1.71 raeburn 511: =item $exttool
512:
513: If URL is for an External Tool, will contain the target type: iframe, window or tab.
514:
515: =item $linktext
516:
517: optional. If URL is for an External Tool, and target type is window or tab,
518: then the link text may be an option set in the course for each tool instance,
519: or may be a default defined in the domain for all instances of the tool.
520:
521: =item $explanation
522:
523: optional. If URL is for an External Tool, and target type is window or tab,
524: then the explanation is an option set in the course for each tool instance,
525: or may be a default defined in the domain for all instances of the tool.
526:
1.49 raeburn 527: =item $title
528:
1.77 ! raeburn 529: optional. If wrapped item is a PDF, and $clientmobile is true,
! 530: a link to a PDF is shown. The "title" will be displayed
1.49 raeburn 531: above the link, but if not provided as an arg, $env{'form.title'}
532: will be used, otherwise, the filename will be displayed (unless
533: hidden URL set for the resource).
534:
1.71 raeburn 535: =item $width
536:
537: optional. If URL is for an External Tool, and target type is window,
538: then a default width may have been defined in the domain for all instances of
539: the tool. If so, that width will be used for the window opened (via a link)
540: to launch the external tool.
541:
542: =item $height
543:
544: optional. If URL is for an External Tool, and target type is window,
545: then a default height may have been defined in the domain for all instances of
546: the tool. If so, that height will be used for the window opened (via a link)
547: to launch the external tool.
548:
1.45 raeburn 549: =back
550:
1.38 droeschl 551: Returns markup for the entire page.
1.30 jms 552:
553: =item handler()
554:
1.71 raeburn 555: Content handler for requests for: /adm/wrapper/...
556: used for content to be displayed in an iframe, or launched in a separate tab
557: or window via a link. The target URL is extracted from the requested URL, by
558: removing the /adm/wrapper prefix.
559:
560: The target URL will typically be a PDF served from the current server, an
561: external resource URL served from a different server, or an external tool
562: (from an LTI Provider) launched from LON-CAPA (as LTI Consumer) and launched
563: via a link.
564:
565: If the request included forceedit in the query string, and the requester has
566: rights to modify course content, then the editor will be didplayed to allow
567: changes to be made to the resource (e.g., change the URL of the external resource,
568: or change the setting for the external tool instance.
569:
570: If not in edit mode, then the wrapper() subroutine will be called to generate the
571: standard LON-CAPA inline menu, and then either a link to launch a separate tab or
572: window, or an iframe to display the content inline.
573:
1.30 jms 574: =back
575:
576: =cut
1.1 www 577:
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