1: # The LearningOnline Network with CAPA
2: # Wrapper for external and binary files as standalone resources
3: #
4: # $Id: lonwrapper.pm,v 1.49.2.7.2.6 2021/10/19 11:27:51 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 LONCAPA qw(:DEFAULT :match);
42: use HTML::Entities();
43:
44: # ================================================================ Main Handler
45: sub wrapper {
46: my ($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,$linktext,$explanation,
47: $title,$width,$height) = @_;
48:
49: my $forcereg;
50: unless ($env{'form.folderpath'}) {
51: $forcereg = 1;
52: }
53:
54: my %lt = &Apache::lonlocal::texthash(
55: 'noif' => 'No iframe support.',
56: 'show' => 'Show content in pop-up window',
57: );
58:
59: (undef,undef,undef,undef,undef,undef,my $clientmobile) =
60: &Apache::loncommon::decode_user_agent($r);
61:
62: my ($anchor,$uselink);
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'};
71: }
72: unless (($is_pdf) && ($clientmobile)) {
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: }
78: }
79:
80: my $noiframe = &Apache::loncommon::modal_link($url.$anchor,$lt{'show'},500,400);
81: my $args = {'bgcolor' => '#FFFFFF'};
82: if ($forcereg) {
83: $args->{'force_register'} = $forcereg;
84: }
85: if (ref($brcrum) eq 'ARRAY') {
86: $args->{'bread_crumbs'} = $brcrum;
87: }
88: if ($absolute) {
89: $args->{'use_absolute'} = $absolute;
90: }
91: if ($env{'form.only_body'}) {
92: $args->{'only_body'} = $env{'form.only_body'};
93: }
94:
95: my $headjs;
96:
97: #
98: # Where iframe is in use, if window.onload() executes before the custom resize function
99: # has been defined (jQuery), two global javascript vars (LCnotready and LCresizedef)
100: # are used to ensure document.ready() triggers a call to resize, so the iframe contents
101: # do not obscure the Functions menu.
102: #
103:
104: unless ($clientmobile || ($exttool eq 'window') || ($exttool eq 'tab') || $uselink) {
105: $headjs = '
106: <script type="text/javascript">
107: // <![CDATA[
108: var LCnotready = 0;
109: var LCresizedef = 0;
110: // ]]>
111: </script>'."\n";
112: }
113:
114: my $startpage = &Apache::loncommon::start_page('Menu',$headjs,$args);
115: my $endpage = &Apache::loncommon::end_page();
116:
117: if (($uselink) && ($title eq '')) {
118: if ($env{'form.symb'}) {
119: $title=&Apache::lonnet::gettitle($env{'form.symb'});
120: } else {
121: my $symb=&Apache::lonnet::symbread($r->uri);
122: if ($symb) {
123: $title=&Apache::lonnet::gettitle($symb);
124: }
125: }
126: }
127: if ($clientmobile || ($exttool eq 'window') || ($exttool eq 'tab')) {
128: my $output = $startpage;
129: if ($is_pdf) {
130: $linktext = &mt('Link to PDF (for mobile devices)');
131: $output .= &create_link($url,$anchor,$title,$linktext);
132: } elsif (($exttool eq 'window') || ($exttool eq 'tab')) {
133: if ($linktext eq '') {
134: $linktext = &mt('Launch External Tool');
135: }
136: $url = &HTML::Entities::encode($url,'"<>&');
137: if ($exttool eq 'tab') {
138: $output .= '<div>'.
139: '<a href="'.$url.'" target="LCExternalToolTab" style="padding:0;clear:both;margin:0;border:0">'.
140: $linktext.'</a>'.
141: '</div>';
142: } else {
143: $output .= <<"ENDLINK";
144: <script type="text/javascript">
145: // <![CDATA[
146: var windowObjectReference = null;
147: var PreviousUrl;
148:
149: function openSinglePopup(strUrl) {
150: if (windowObjectReference == null || windowObjectReference.closed) {
151: windowObjectReference = window.open(strUrl, "LCExternalToolPopUp",
152: "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
153: } else if(PreviousUrl != strUrl) {
154: windowObjectReference = window.open(strUrl, "LCExternalToolPopUp",
155: "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
156: windowObjectReference.focus();
157: } else {
158: windowObjectReference.focus();
159: };
160: PreviousUrl = strUrl;
161: }
162: // ]]>
163: </script>
164: <div>
165: <a href="$url" target="LCExternalToolPopUp" onclick="openSinglePopup(this.href); return false;">
166: $linktext</a>
167: </div>
168: ENDLINK
169: }
170: if ($explanation ne '') {
171: $output .= '<div>'.$explanation.'</div>';
172: }
173: } else {
174: if ($uselink) {
175: $linktext = &mt('Link to resource');
176: $output .= &create_link($url,$anchor,$title,$linktext);
177: } else {
178: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
179: $output .= '<div style="overflow:scroll; -webkit-overflow-scrolling:touch;">'."\n".
180: '<iframe src="'.$dest.'" height="100%" width="100%" frameborder="0">'."\n".
181: "$lt{'noif'} $noiframe\n".
182: "</iframe>\n".
183: "</div>\n";
184: }
185: }
186: $output .= $endpage;
187: return $output;
188: } elsif ($uselink) {
189: $linktext = &mt('Link to resource');
190: return $startpage.&create_link($url,$anchor,$title,$linktext).$endpage;
191: } else {
192: my $offset = 5;
193: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['inhibitmenu']);
194: if ($env{'form.inhibitmenu'} eq 'yes') {
195: $offset = 0;
196: }
197: my $script = &Apache::lonhtmlcommon::scripttag(<<SCRIPT);
198: \$(document).ready( function() {
199: \$(window).unbind('resize').resize(function(){
200: var header = null;
201: var offset = $offset;
202: var height = 0;
203: var hdrtop = 0;
204: if (\$('div.LC_head_subbox:first').length) {
205: header = \$('div.LC_head_subbox:first');
206: offset = 9;
207: } else {
208: if (\$('#LC_breadcrumbs').length) {
209: header = \$('#LC_breadcrumbs');
210: }
211: }
212: if (header != null && header.length) {
213: height = header.height();
214: hdrtop = header.position().top;
215: }
216: var pos = height + hdrtop + offset;
217: \$('.LC_iframecontainer').css('top', pos);
218: });
219: LCresizedef = 1;
220: if (LCnotready == 1) {
221: LCnotready = 0;
222: \$(window).trigger('resize');
223: }
224: });
225: window.onload = function(){
226: if (LCresizedef) {
227: LCnotready = 0;
228: \$(window).trigger('resize');
229: } else {
230: LCnotready = 1;
231: }
232: };
233: SCRIPT
234: # javascript will position the iframe if window was resized (or zoomed)
235: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
236: return <<ENDFRAME;
237: $startpage
238: $script
239: <div class="LC_iframecontainer">
240: <iframe src="$dest">$lt{'noif'} $noiframe</iframe>
241: </div>
242: $endpage
243: ENDFRAME
244: }
245: }
246:
247: sub create_link {
248: my ($url,$anchor,$title,$linktext) = @_;
249: my $shownlink;
250: if ($title eq '') {
251: $title = $env{'form.title'};
252: if ($title eq '') {
253: unless ($env{'request.enc'}) {
254: ($title) = ($url =~ m{/([^/]+)$});
255: $title =~ s/(\?[^\?]+)$//;
256: }
257: }
258: }
259: unless ($title eq '') {
260: $shownlink = '<span style="font-weight:bold;">'.$title.'</span><br />';
261: }
262: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
263: $shownlink .= '<a href="'.$dest.'">'.$linktext.'</a>';
264: return $shownlink;
265: }
266:
267: sub handler {
268: my $r=shift;
269: &Apache::loncommon::content_type($r,'text/html');
270: $r->send_http_header;
271:
272: return OK if $r->header_only;
273:
274: my $url = $r->uri;
275: my ($is_ext,$brcrum,$absolute,$is_pdf,$exttool,$cdom,$cnum,$hostname,
276: $linktext,$explanation,$width,$height);
277:
278: for ($url){
279: s|^/adm/wrapper||;
280: $is_ext = $_ =~ s|^/ext/|http://|;
281: s|http://https://|https://| if ($is_ext);
282: s|:|:|g;
283: }
284:
285: if ($url =~ /\.pdf$/i) {
286: $is_pdf = 1;
287: } elsif ($url =~ m{^/adm/($match_domain)/($match_courseid)/(\d+)/ext\.tool$}) {
288: $cdom = $1;
289: $cnum = $2;
290: my $marker = $3;
291: $exttool = 'iframe';
292: my $exttoolremote;
293: my %toolhash = &Apache::lonnet::get('exttool_'.$marker,['target','linktext','explanation','id','width','height'],
294: $cdom,$cnum);
295: if ($toolhash{'id'}) {
296: my %ltitools = &Apache::lonnet::get_domain_lti($cdom,'consumer');
297: if (ref($ltitools{$toolhash{'id'}}) eq 'HASH') {
298: $exttoolremote = $ltitools{$toolhash{'id'}}{'url'};
299: }
300: }
301: if ($toolhash{'target'} eq 'window') {
302: $exttool = 'window';
303: $width = $toolhash{'width'};
304: $height = $toolhash{'height'};
305: } elsif ($toolhash{'target'} eq 'tab') {
306: $exttool = 'tab';
307: }
308: if (($exttool eq 'window') || ($exttool eq 'tab')) {
309: $linktext = $toolhash{'linktext'};
310: $explanation = $toolhash{'explanation'};
311: } elsif (($exttoolremote =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
312: $exttool = 'tab';
313: }
314: }
315: if (($is_ext) || ($exttool)) {
316: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
317: ['forceedit','register','folderpath','symb','idx','title','anchor']);
318: if (($env{'form.forceedit'}) &&
319: (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
320: (($env{'form.folderpath'} =~ /^supplemental/) ||
321: ($env{'form.symb'} =~ /^uploaded/))) {
322: if ($env{'form.symb'}) {
323: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
324: if ($res =~ /(#[^#]+)$/) {
325: $url .= $1;
326: }
327: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
328: if ($env{'form.anchor'} ne '') {
329: $url .= '#'.$env{'form.anchor'};
330: }
331: }
332: my $type = 'ext';
333: if ($exttool) {
334: $type = 'tool';
335: } elsif (($url =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
336: $hostname = $r->hostname();
337: }
338: $r->print(
339: &Apache::lonextresedit::display_editor($url,$env{'form.folderpath'},
340: $env{'form.symb'},
341: $env{'form.idx'},$type,$cdom,
342: $cnum,$hostname));
343: return OK;
344: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
345: my $crstype = &Apache::loncommon::course_type();
346: my $title = $env{'form.title'};
347: if ($title eq '') {
348: if ($is_ext) {
349: $title = &mt('External Resource');
350: } else {
351: $title = &mt('External Tool');
352: }
353: }
354: $brcrum =
355: &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
356: }
357: }
358:
359: #
360: # Actual URL
361: #
362: if (($url=~/$LONCAPA::assess_re/) && (!$exttool)) {
363: #
364: # This is uploaded homework
365: #
366: $env{'request.state'}='uploaded';
367: &Apache::lonhomework::renderpage($r,$url);
368: } else {
369: #
370: # This is not homework
371: #
372: if (($is_ext) || ($exttool)) {
373: $absolute = $env{'request.use_absolute'};
374: $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
375: $ENV{'QUERY_STRING'} =~ s/\&$//;
376: }
377:
378: unless ($ENV{'QUERY_STRING'} eq '') {
379: $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
380: }
381:
382: # encrypt url if not external
383: unless ($is_ext) {
384: &Apache::lonenc::check_encrypt(\$url);
385: }
386:
387: $r->print( wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,
388: $linktext,$explanation,undef,$width,$height) );
389:
390: } # not just the menu
391:
392: return OK;
393: } # handler
394:
395: 1;
396: __END__
397:
398: =pod
399:
400: =head1 NAME
401:
402: Apache::lonwrapper - External and binary file management.
403:
404: =head1 SYNOPSIS
405:
406: Wrapper for external and binary files as standalone resources. Edit handler for rat maps; TeX content handler.
407:
408: This is part of the LearningOnline Network with CAPA project
409: described at http://www.lon-capa.org.
410:
411: =head1 Subroutines
412:
413: =over
414:
415: =item wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,$linktext,$explanation,$title,$width,$height)
416:
417: =over
418:
419: =item $r
420:
421: request object
422:
423: =item $url
424:
425: url to display by including in an iframe within a
426: LON-CAPA page which has a standard LON-CAPA inline menu.
427:
428: =item $brcrum
429:
430: breadcrumbs for unregistered urls
431: (i.e., external resources in Supplemental Content).
432:
433: =item $absolute
434:
435: contains protocol (http or https) followed by
436: the hostname, if menu items in the standard LON-CAPA
437: interface created by the call to loncommon::start_page()
438: within &wrapper() need to use absolute URLs rather than
439: relative URLs.
440:
441: That will be the case where an external resource has been
442: served from port 80, when the server customarily serves
443: requests using Apache/SSL (i.e., port 443). mod_rewrite
444: is used to switch requests for external resources and
445: the syllabus: /public/<domain>/<courseid>/syllabus
446: (which might also point at an external resource)
447: from https:// to http:// where the the URL of the remote site
448: specified in the resource itself is http://.
449:
450: This is done to avoid default mixed content blocking
451: in Firefox 23 and later, when serving from Apache/SSL.
452:
453: =item $is_ext
454:
455: true if URL is for an external resource.
456:
457: =item $is_pdf
458:
459: true if URL is for a PDF (based on file extension).
460:
461: =item $title
462:
463: optional. If wrapped item is a PDF, and $clientmobile is true,
464: a link to a PDF is shown. The "title" will be displayed
465: above the link, but if not provided as an arg, $env{'form.title'}
466: will be used, otherwise, the filename will be displayed (unless
467: hidden URL set for the resource).
468:
469: =back
470:
471: Returns markup for the entire page.
472:
473: =item handler()
474:
475: =back
476:
477: =cut
478:
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