1: # The LearningOnline Network with CAPA
2: # Wrapper for external and binary files as standalone resources
3: #
4: # $Id: lonwrapper.pm,v 1.49.2.11 2021/12/15 00:41:48 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:
41: # ================================================================ Main Handler
42: sub wrapper {
43: my ($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$title) = @_;
44:
45: my $forcereg;
46: unless ($env{'form.folderpath'}) {
47: $forcereg = 1;
48: }
49:
50: my %lt = &Apache::lonlocal::texthash(
51: 'noif' => 'No iframe support.',
52: 'show' => 'Show content in pop-up window',
53: );
54:
55: (undef,undef,undef,undef,undef,undef,my $clientmobile) =
56: &Apache::loncommon::decode_user_agent($r);
57:
58: my ($anchor,$uselink,$linktext);
59: if ($is_ext) {
60: if ($env{'form.symb'}) {
61: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
62: if ($res =~ /(#[^#]+)$/) {
63: $anchor = $1;
64: }
65: } elsif ($env{'form.anchor'} ne '') {
66: $anchor = '#'.$env{'form.anchor'};
67: }
68: unless (($is_pdf) && ($clientmobile)) {
69: my $hostname = $r->hostname();
70: my $lonhost = $r->dir_config('lonHostID');
71: my $ip = &Apache::lonnet::get_host_ip($lonhost);
72: $uselink = &Apache::loncommon::is_nonframeable($url,$absolute,$hostname,$ip);
73: }
74: }
75:
76: my $noiframe = &Apache::loncommon::modal_link($url.$anchor,$lt{'show'},500,400);
77: my $args = {'bgcolor' => '#FFFFFF'};
78: if ($forcereg) {
79: $args->{'force_register'} = $forcereg;
80: }
81: if (ref($brcrum) eq 'ARRAY') {
82: $args->{'bread_crumbs'} = $brcrum;
83: }
84: if ($absolute) {
85: $args->{'use_absolute'} = $absolute;
86: }
87: if ($env{'form.only_body'}) {
88: $args->{'only_body'} = $env{'form.only_body'};
89: }
90:
91: my $headjs;
92:
93: #
94: # Where iframe is in use, if window.onload() executes before the custom resize function
95: # has been defined (jQuery), two global javascript vars (LCnotready and LCresizedef)
96: # are used to ensure document.ready() triggers a call to resize, so the iframe contents
97: # do not obscure the Functions menu.
98: #
99:
100: unless ($clientmobile || $uselink) {
101: $headjs = '
102: <script type="text/javascript">
103: // <![CDATA[
104: var LCnotready = 0;
105: var LCresizedef = 0;
106: // ]]>
107: </script>'."\n";
108: }
109:
110: my $startpage = &Apache::loncommon::start_page('Menu',$headjs,$args);
111: my $endpage = &Apache::loncommon::end_page();
112:
113: if (($uselink) && ($title eq '')) {
114: if ($env{'form.symb'}) {
115: $title=&Apache::lonnet::gettitle($env{'form.symb'});
116: } else {
117: my $symb=&Apache::lonnet::symbread($r->uri);
118: if ($symb) {
119: $title=&Apache::lonnet::gettitle($symb);
120: }
121: }
122: }
123: if ($clientmobile) {
124: my $output = $startpage;
125: if ($is_pdf) {
126: $linktext = &mt('Link to PDF (for mobile devices)');
127: $output .= &create_link($url,$anchor,$title,$linktext);
128: } else {
129: if ($uselink) {
130: $linktext = &mt('Link to resource');
131: $output .= &create_link($url,$anchor,$title,$linktext);
132: } else {
133: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
134: $output .= '<div style="overflow:scroll; -webkit-overflow-scrolling:touch;">'."\n".
135: '<iframe src="'.$dest.'" height="100%" width="100%" frameborder="0">'."\n".
136: "$lt{'noif'} $noiframe\n".
137: "</iframe>\n".
138: "</div>\n";
139: }
140: }
141: $output .= $endpage;
142: return $output;
143: } elsif ($uselink) {
144: $linktext = &mt('Link to resource');
145: return $startpage.&create_link($url,$anchor,$title,$linktext).$endpage;
146: } else {
147: my $offset = 5;
148: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['inhibitmenu']);
149: if ($env{'form.inhibitmenu'} eq 'yes') {
150: $offset = 0;
151: }
152: my $script = &Apache::lonhtmlcommon::scripttag(<<SCRIPT);
153: \$(document).ready( function() {
154: \$(window).unbind('resize').resize(function(){
155: var header = null;
156: var offset = $offset;
157: var height = 0;
158: var hdrtop = 0;
159: if (\$('div.LC_head_subbox:first').length) {
160: header = \$('div.LC_head_subbox:first');
161: offset = 9;
162: } else {
163: if (\$('#LC_breadcrumbs').length) {
164: header = \$('#LC_breadcrumbs');
165: }
166: }
167: if (header != null && header.length) {
168: height = header.height();
169: hdrtop = header.position().top;
170: }
171: var pos = height + hdrtop + offset;
172: \$('.LC_iframecontainer').css('top', pos);
173: });
174: LCresizedef = 1;
175: if (LCnotready == 1) {
176: LCnotready = 0;
177: \$(window).trigger('resize');
178: }
179: });
180: window.onload = function(){
181: if (LCresizedef) {
182: LCnotready = 0;
183: \$(window).trigger('resize');
184: } else {
185: LCnotready = 1;
186: }
187: };
188: SCRIPT
189: # javascript will position the iframe if window was resized (or zoomed)
190: return <<ENDFRAME;
191: $startpage
192: $script
193: <div class="LC_iframecontainer">
194: <iframe src="$url$anchor">$lt{'noif'} $noiframe</iframe>
195: </div>
196: $endpage
197: ENDFRAME
198: }
199: }
200:
201: sub create_link {
202: my ($url,$anchor,$title,$linktext) = @_;
203: my $shownlink;
204: if ($title eq '') {
205: $title = $env{'form.title'};
206: if ($title eq '') {
207: unless ($env{'request.enc'}) {
208: ($title) = ($url =~ m{/([^/]+)$});
209: $title =~ s/(\?[^\?]+)$//;
210: }
211: }
212: }
213: unless ($title eq '') {
214: $shownlink = '<span style="font-weight:bold;">'.$title.'</span><br />';
215: }
216: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
217: $shownlink .= '<a href="'.$dest.'">'.$linktext.'</a>';
218: return $shownlink;
219: }
220:
221: sub handler {
222: my $r=shift;
223: &Apache::loncommon::content_type($r,'text/html');
224: $r->send_http_header;
225:
226: return OK if $r->header_only;
227:
228: my $url = $r->uri;
229: my ($is_ext,$brcrum,$absolute,$is_pdf,$cdom,$cnum,$hostname);
230:
231: for ($url){
232: s|^/adm/wrapper||;
233: $is_ext = $_ =~ s|^/ext/|http://|;
234: s|http://https://|https://| if ($is_ext);
235: s|:|:|g;
236: }
237:
238: if ($url =~ /\.pdf$/i) {
239: $is_pdf = 1;
240: }
241:
242: if ($is_ext) {
243: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
244: ['forceedit','register','folderpath','symb','idx','title','anchor']);
245: if (($env{'form.forceedit'}) &&
246: (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
247: (($env{'form.folderpath'} =~ /^supplemental/) ||
248: ($env{'form.symb'} =~ /^uploaded/))) {
249: if ($env{'form.symb'}) {
250: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
251: if ($res =~ /(#[^#]+)$/) {
252: $url .= $1;
253: }
254: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
255: if ($env{'form.anchor'} ne '') {
256: $url .= '#'.$env{'form.anchor'};
257: }
258: }
259: if (($url =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
260: $hostname = $r->hostname();
261: }
262: my $type = 'ext';
263: $r->print(
264: &Apache::lonextresedit::display_editor($url,$env{'form.folderpath'},
265: $env{'form.symb'},
266: $env{'form.idx'},$type,$cdom,
267: $cnum,$hostname));
268: return OK;
269: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
270: my $crstype = &Apache::loncommon::course_type();
271: my $title = $env{'form.title'};
272: if ($title eq '') {
273: $title = &mt('External Resource');
274: }
275: $brcrum =
276: &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
277: }
278: }
279:
280: #
281: # Actual URL
282: #
283: if ($url=~/$LONCAPA::assess_re/) {
284: #
285: # This is uploaded homework
286: #
287: $env{'request.state'}='uploaded';
288: &Apache::lonhomework::renderpage($r,$url);
289: } else {
290: #
291: # This is not homework
292: #
293: if ($is_ext) {
294: $absolute = $env{'request.use_absolute'};
295: $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
296: $ENV{'QUERY_STRING'} =~ s/\&$//;
297: }
298:
299: unless ($ENV{'QUERY_STRING'} eq '') {
300: $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
301: }
302:
303: # encrypt url if not external
304: &Apache::lonenc::check_encrypt(\$url) if $url !~ /^https?\:/ ;
305:
306: $r->print( wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf) );
307:
308: } # not just the menu
309:
310: return OK;
311: } # handler
312:
313: 1;
314: __END__
315:
316: =pod
317:
318: =head1 NAME
319:
320: Apache::lonwrapper - External and binary file management.
321:
322: =head1 SYNOPSIS
323:
324: Wrapper for external and binary files as standalone resources. Edit handler for rat maps; TeX content handler.
325:
326: This is part of the LearningOnline Network with CAPA project
327: described at http://www.lon-capa.org.
328:
329: =head1 Subroutines
330:
331: =over
332:
333: =item wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$title))
334:
335: =over
336:
337: =item $r
338:
339: request object
340:
341: =item $url
342:
343: url to display by including in an iframe within a
344: LON-CAPA page which has a standard LON-CAPA inline menu.
345:
346: =item $brcrum
347:
348: breadcrumbs for unregistered urls
349: (i.e., external resources in Supplemental Content).
350:
351: =item $absolute
352:
353: contains protocol (http or https) followed by
354: the hostname, if menu items in the standard LON-CAPA
355: interface created by the call to loncommon::start_page()
356: within &wrapper() need to use absolute URLs rather than
357: relative URLs.
358:
359: That will be the case where an external resource has been
360: served from port 80, when the server customarily serves
361: requests using Apache/SSL (i.e., port 443). mod_rewrite
362: is used to switch requests for external resources and
363: the syllabus: /public/<domain>/<courseid>/syllabus
364: (which might also point at an external resource)
365: from https:// to http:// where the the URL of the remote site
366: specified in the resource itself is http://.
367:
368: This is done to avoid default mixed content blocking
369: in Firefox 23 and later, when serving from Apache/SSL.
370:
371: =item $is_ext
372:
373: true if URL is for an external resource.
374:
375: =item $is_pdf
376:
377: true if URL is for a PDF (based on file extension).
378:
379: =item $title
380:
381: optional. If wrapped item is a PDF, and $clientmobile is true,
382: a link to a PDF is shown. The "title" will be displayed
383: above the link, but if not provided as an arg, $env{'form.title'}
384: will be used, otherwise, the filename will be displayed (unless
385: hidden URL set for the resource).
386:
387: =back
388:
389: Returns markup for the entire page.
390:
391: =item handler()
392:
393: =back
394:
395: =cut
396:
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