File:
[LON-CAPA] /
rat /
lonwrapper.pm
Revision
1.46:
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Tue Oct 22 23:13:54 2013 UTC (10 years, 11 months ago) by
raeburn
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MAIN
CVS tags:
version_2_11_0_RC2,
HEAD
- Prevent truncation of content in external resources by using
"overflow:scroll; -webkit-overflow-scrolling:touch" style for div wrapped
around iframe used to contain external URL, when mobile device (e.g.,
iPad, iPhone etc.).
1: # The LearningOnline Network with CAPA
2: # Wrapper for external and binary files as standalone resources
3: #
4: # $Id: lonwrapper.pm,v 1.46 2013/10/22 23:13:54 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 ($url,$brcrum,$absolute,$is_ext) = @_;
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 $noiframe = &Apache::loncommon::modal_link($url,$lt{'show'},500,400);
56: my $args = {'bgcolor' => '#FFFFFF'};
57: if ($forcereg) {
58: $args->{'force_register'} = $forcereg;
59: }
60: if (ref($brcrum) eq 'ARRAY') {
61: $args->{'bread_crumbs'} = $brcrum;
62: }
63: if ($absolute) {
64: $args->{'use_absolute'} = $absolute;
65: }
66:
67: my $startpage = &Apache::loncommon::start_page('Menu',undef,$args);
68: my $endpage = &Apache::loncommon::end_page();
69:
70: if ($env{'browser.mobile'}) {
71: return <<ENDFRAME;
72: $startpage
73: <div style="overflow:scroll; -webkit-overflow-scrolling:touch;">
74: <iframe src="$url" height="100%" width="100%" frameborder="0">
75: $lt{'noif'} $noiframe
76: </iframe>
77: </div>
78: $endpage
79: ENDFRAME
80: } else {
81: my $script = &Apache::lonhtmlcommon::scripttag(<<SCRIPT);
82: \$(document).ready( function() {
83: \$(window).unbind('resize').resize(function(){
84: var header;
85: var offset = 5;
86: var height = 0;
87: var hdrtop = 0;
88: if (\$('div.LC_head_subbox:first').length) {
89: header = \$('div.LC_head_subbox:first');
90: offset = 9;
91: } else {
92: if (\$('#LC_breadcrumbs').length) {
93: header = \$('#LC_breadcrumbs');
94: }
95: }
96: if (header.length) {
97: height = header.height();
98: hdrtop = header.position().top;
99: }
100: var pos = height + hdrtop + offset;
101: \$('.LC_iframecontainer').css('top', pos);
102: });
103: });
104: window.onload = function(){ \$(window).trigger('resize') };
105: SCRIPT
106: # javascript will position the iframe if window was resized (or zoomed)
107: return <<ENDFRAME;
108: $startpage
109: $script
110: <div class="LC_iframecontainer">
111: <iframe src="$url">$lt{'noif'} $noiframe</iframe>
112: </div>
113: $endpage
114: ENDFRAME
115: }
116: }
117:
118: sub handler {
119: my $r=shift;
120: &Apache::loncommon::content_type($r,'text/html');
121: $r->send_http_header;
122:
123: return OK if $r->header_only;
124:
125: my $url = $r->uri;
126: my ($is_ext,$brcrum,$absolute);
127:
128: for ($url){
129: s|^/adm/wrapper||;
130: $is_ext = $_ =~ s|^/ext/|http://|;
131: s|http://https://|https://|;
132: s|:|:|g;
133: }
134:
135: if ($is_ext) {
136: my $hostname = $r->hostname();
137: my $lonhost = &Apache::lonnet::host_from_dns($hostname);
138: if ($lonhost) {
139: my $actual = &Apache::lonnet::absolute_url($hostname);
140: my $expected = $Apache::lonnet::protocol{$lonhost}.'://'.$hostname;
141: unless ($actual eq $expected) {
142: $absolute = $expected;
143: }
144: }
145: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
146: ['forceedit','register','folderpath','symb','idx','title']);
147: if (($env{'form.forceedit'}) &&
148: (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
149: (($env{'form.folderpath'} =~ /^supplemental/) ||
150: ($env{'form.symb'} =~ /^uploaded/))) {
151: $r->print(
152: &Apache::lonextresedit::display_editor($url,$env{'form.folderpath'},
153: $env{'form.symb'},
154: $env{'form.idx'}));
155: return OK;
156: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
157: my $crstype = &Apache::loncommon::course_type();
158: my $title = $env{'form.title'};
159: if ($title eq '') {
160: $title = &mt('External Resource');
161: }
162: $brcrum =
163: &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
164: }
165: }
166:
167: #
168: # Actual URL
169: #
170: if ($url=~/$LONCAPA::assess_re/) {
171: #
172: # This is uploaded homework
173: #
174: $env{'request.state'}='uploaded';
175: &Apache::lonhomework::renderpage($r,$url);
176: } else {
177: #
178: # This is not homework
179: #
180: if ($is_ext) {
181: $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
182: $ENV{'QUERY_STRING'} =~ s/\&$//;
183: }
184:
185: unless ($ENV{'QUERY_STRING'} eq '') {
186: $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
187: }
188:
189: # encrypt url if not external
190: &Apache::lonenc::check_encrypt(\$url) if $url !~ /^https?\:/ ;
191:
192: $r->print( wrapper($url,$brcrum,$absolute,$is_ext) );
193:
194: } # not just the menu
195:
196: return OK;
197: } # handler
198:
199: 1;
200: __END__
201:
202: =pod
203:
204: =head1 NAME
205:
206: Apache::lonwrapper - External and binary file management.
207:
208: =head1 SYNOPSIS
209:
210: Wrapper for external and binary files as standalone resources. Edit handler for rat maps; TeX content handler.
211:
212: This is part of the LearningOnline Network with CAPA project
213: described at http://www.lon-capa.org.
214:
215: =head1 Subroutines
216:
217: =over
218:
219: =item wrapper($url,$brcrum,$absolute,$is_ext)
220:
221: =over
222:
223: =item $url
224:
225: url to display by including in an iframe within a
226: LON-CAPA page which has a standard LON-CAPA inline menu.
227:
228: =item $brcrum
229:
230: breadcrumbs for unregistered urls
231: (i.e., external resources in Supplemental Content).
232:
233: =item $absolute
234:
235: contains protocol (http or https) followed by
236: the hostname, if menu items in the standard LON-CAPA
237: interface created by the call to loncommon::start_page()
238: within &wrapper() need to use absolute URLs rather than
239: relative URLs.
240:
241: That will be the case where an external resource has been
242: served from port 80, when the server customarily serves
243: requests using Apache/SSL (i.e., port 443). mod_rewrite
244: is used to switch requests for external resources
245: from https:// to http:// where the the URL of the remote site
246: specified in the resource itself is http://.
247:
248: This is done to avoid default mixed content blocking
249: in Firefox 23 and later, when serving from Apache/SSL.
250:
251: =item $is_ext
252:
253: true if URL is for an external resource.
254:
255: =back
256:
257: Returns markup for the entire page.
258:
259: =item handler()
260:
261: =back
262:
263: =cut
264:
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