1: # The LearningOnline Network with CAPA
2: # Wrapper for external and binary files as standalone resources
3: #
4: # $Id: lonwrapper.pm,v 1.49.2.6 2019/07/31 00:36:10 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: $forcereg = 1;
48: }
49:
50: my %lt = &Apache::lonlocal::texthash(
51: 'noif' => 'No iframe support.',
52: 'show' => 'Show content in pop-up window',
53: );
54:
55: my ($anchor,$uselink);
56: if ($is_ext) {
57: if ($env{'form.symb'}) {
58: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
59: if ($res =~ /(#[^#]+)$/) {
60: $anchor = $1;
61: }
62: } elsif ($env{'form.anchor'} ne '') {
63: $anchor = '#'.$env{'form.anchor'};
64: }
65: unless (($is_pdf) && ($env{'browser.mobile'})) {
66: my $hostname = $r->hostname();
67: my $lonhost = $r->dir_config('lonHostID');
68: my $ip = &Apache::lonnet::get_host_ip($lonhost);
69: $uselink = &Apache::loncommon::is_nonframeable($url,$absolute,$hostname,$ip);
70: }
71: }
72:
73: my $noiframe = &Apache::loncommon::modal_link($url.$anchor,$lt{'show'},500,400);
74: my $args = {'bgcolor' => '#FFFFFF'};
75: if ($forcereg) {
76: $args->{'force_register'} = $forcereg;
77: }
78: if (ref($brcrum) eq 'ARRAY') {
79: $args->{'bread_crumbs'} = $brcrum;
80: }
81: if ($absolute) {
82: $args->{'use_absolute'} = $absolute;
83: }
84: if ($env{'form.only_body'}) {
85: $args->{'only_body'} = $env{'form.only_body'};
86: }
87:
88: my $startpage = &Apache::loncommon::start_page('Menu',undef,$args);
89: my $endpage = &Apache::loncommon::end_page();
90:
91: if (($uselink) && ($title eq '')) {
92: if ($env{'form.symb'}) {
93: $title=&Apache::lonnet::gettitle($env{'form.symb'});
94: } else {
95: my $symb=&Apache::lonnet::symbread($r->uri);
96: if ($symb) {
97: $title=&Apache::lonnet::gettitle($symb);
98: }
99: }
100: }
101: if ($env{'browser.mobile'}) {
102: my $output = $startpage;
103: if ($is_pdf) {
104: $linktext = &mt('Link to PDF (for mobile devices)');
105: $output .= &create_link($url,$anchor,$title,$linktext);
106: } else {
107: if ($uselink) {
108: $linktext = &mt('Link to resource');
109: $output .= &create_link($url,$anchor,$title,$linktext);
110: } else {
111: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
112: $output .= '<div style="overflow:scroll; -webkit-overflow-scrolling:touch;">'."\n".
113: '<iframe src="'.$dest.'" height="100%" width="100%" frameborder="0">'."\n".
114: "$lt{'noif'} $noiframe\n".
115: "</iframe>\n".
116: "</div>\n";
117: }
118: }
119: $output .= $endpage;
120: return $output;
121: } elsif ($uselink) {
122: $linktext = &mt('Link to resource');
123: return $startpage.&create_link($url,$anchor,$title,$linktext).$endpage;
124: } else {
125: my $offset = 5;
126: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['inhibitmenu']);
127: if ($env{'form.inhibitmenu'} eq 'yes') {
128: $offset = 0;
129: }
130: my $script = &Apache::lonhtmlcommon::scripttag(<<SCRIPT);
131: \$(document).ready( function() {
132: \$(window).unbind('resize').resize(function(){
133: var header = null;
134: var offset = $offset;
135: var height = 0;
136: var hdrtop = 0;
137: if (\$('div.LC_head_subbox:first').length) {
138: header = \$('div.LC_head_subbox:first');
139: offset = 9;
140: } else {
141: if (\$('#LC_breadcrumbs').length) {
142: header = \$('#LC_breadcrumbs');
143: }
144: }
145: if (header != null && header.length) {
146: height = header.height();
147: hdrtop = header.position().top;
148: }
149: var pos = height + hdrtop + offset;
150: \$('.LC_iframecontainer').css('top', pos);
151: });
152: });
153: window.onload = function(){ \$(window).trigger('resize') };
154: SCRIPT
155: # javascript will position the iframe if window was resized (or zoomed)
156: return <<ENDFRAME;
157: $startpage
158: $script
159: <div class="LC_iframecontainer">
160: <iframe src="$url$anchor">$lt{'noif'} $noiframe</iframe>
161: </div>
162: $endpage
163: ENDFRAME
164: }
165: }
166:
167: sub create_link {
168: my ($url,$anchor,$title,$linktext) = @_;
169: my $shownlink;
170: if ($title eq '') {
171: $title = $env{'form.title'};
172: if ($title eq '') {
173: unless ($env{'request.enc'}) {
174: ($title) = ($url =~ m{/([^/]+)$});
175: $title =~ s/(\?[^\?]+)$//;
176: }
177: }
178: }
179: unless ($title eq '') {
180: $shownlink = '<span style="font-weight:bold;">'.$title.'</span><br />';
181: }
182: my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
183: $shownlink .= '<a href="'.$dest.'">'.$linktext.'</a>';
184: return $shownlink;
185: }
186:
187: sub handler {
188: my $r=shift;
189: &Apache::loncommon::content_type($r,'text/html');
190: $r->send_http_header;
191:
192: return OK if $r->header_only;
193:
194: my $url = $r->uri;
195: my ($is_ext,$brcrum,$absolute,$is_pdf,$cdom,$cnum,$hostname);
196:
197: for ($url){
198: s|^/adm/wrapper||;
199: $is_ext = $_ =~ s|^/ext/|http://|;
200: s|http://https://|https://|;
201: s|:|:|g;
202: }
203:
204: if ($url =~ /\.pdf$/i) {
205: $is_pdf = 1;
206: }
207:
208: if ($is_ext) {
209: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
210: ['forceedit','register','folderpath','symb','idx','title','anchor']);
211: if (($env{'form.forceedit'}) &&
212: (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
213: (($env{'form.folderpath'} =~ /^supplemental/) ||
214: ($env{'form.symb'} =~ /^uploaded/))) {
215: if ($env{'form.symb'}) {
216: (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
217: if ($res =~ /(#[^#]+)$/) {
218: $url .= $1;
219: }
220: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
221: if ($env{'form.anchor'} ne '') {
222: $url .= '#'.$env{'form.anchor'};
223: }
224: }
225: if (($url =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
226: $hostname = $r->hostname();
227: }
228: my $type = 'ext';
229: $r->print(
230: &Apache::lonextresedit::display_editor($url,$env{'form.folderpath'},
231: $env{'form.symb'},
232: $env{'form.idx'},$type,$cdom,
233: $cnum,$hostname));
234: return OK;
235: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
236: my $crstype = &Apache::loncommon::course_type();
237: my $title = $env{'form.title'};
238: if ($title eq '') {
239: $title = &mt('External Resource');
240: }
241: $brcrum =
242: &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
243: }
244: }
245:
246: #
247: # Actual URL
248: #
249: if ($url=~/$LONCAPA::assess_re/) {
250: #
251: # This is uploaded homework
252: #
253: $env{'request.state'}='uploaded';
254: &Apache::lonhomework::renderpage($r,$url);
255: } else {
256: #
257: # This is not homework
258: #
259: if ($is_ext) {
260: $absolute = $env{'request.use_absolute'};
261: $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
262: $ENV{'QUERY_STRING'} =~ s/\&$//;
263: }
264:
265: unless ($ENV{'QUERY_STRING'} eq '') {
266: $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
267: }
268:
269: # encrypt url if not external
270: &Apache::lonenc::check_encrypt(\$url) if $url !~ /^https?\:/ ;
271:
272: $r->print( wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf) );
273:
274: } # not just the menu
275:
276: return OK;
277: } # handler
278:
279: 1;
280: __END__
281:
282: =pod
283:
284: =head1 NAME
285:
286: Apache::lonwrapper - External and binary file management.
287:
288: =head1 SYNOPSIS
289:
290: Wrapper for external and binary files as standalone resources. Edit handler for rat maps; TeX content handler.
291:
292: This is part of the LearningOnline Network with CAPA project
293: described at http://www.lon-capa.org.
294:
295: =head1 Subroutines
296:
297: =over
298:
299: =item wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$title))
300:
301: =over
302:
303: =item $r
304:
305: request object
306:
307: =item $url
308:
309: url to display by including in an iframe within a
310: LON-CAPA page which has a standard LON-CAPA inline menu.
311:
312: =item $brcrum
313:
314: breadcrumbs for unregistered urls
315: (i.e., external resources in Supplemental Content).
316:
317: =item $absolute
318:
319: contains protocol (http or https) followed by
320: the hostname, if menu items in the standard LON-CAPA
321: interface created by the call to loncommon::start_page()
322: within &wrapper() need to use absolute URLs rather than
323: relative URLs.
324:
325: That will be the case where an external resource has been
326: served from port 80, when the server customarily serves
327: requests using Apache/SSL (i.e., port 443). mod_rewrite
328: is used to switch requests for external resources and
329: the syllabus: /public/<domain>/<courseid>/syllabus
330: (which might also point at an external resource)
331: from https:// to http:// where the the URL of the remote site
332: specified in the resource itself is http://.
333:
334: This is done to avoid default mixed content blocking
335: in Firefox 23 and later, when serving from Apache/SSL.
336:
337: =item $is_ext
338:
339: true if URL is for an external resource.
340:
341: =item $is_pdf
342:
343: true if URL is for a PDF (based on file extension).
344:
345: =item $title
346:
347: optional. If wrapped item is a PDF, and $env{'browser.mobile'}
348: is true, a link to a PDF is shown. The "title" will be displayed
349: above the link, but if not provided as an arg, $env{'form.title'}
350: will be used, otherwise, the filename will be displayed (unless
351: hidden URL set for the resource).
352:
353: =back
354:
355: Returns markup for the entire page.
356:
357: =item handler()
358:
359: =back
360:
361: =cut
362:
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