1: # The LearningOnline Network with CAPA
2: # Wrapper for external and binary files as standalone resources
3: #
4: # $Id: lonwrapper.pm,v 1.48 2014/06/17 23:01:21 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,$is_pdf) = @_;
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: my $output = $startpage;
72: if ($is_pdf) {
73: my $title = $env{'form.title'};
74: if ($title eq '') {
75: unless ($env{'request.enc'}) {
76: ($title) = ($url =~ m{/([^/]+)$});
77: $title =~ s/(\?[^\?]+)$//;
78: }
79: }
80: unless ($title eq '') {
81: $output .= $title.'<br />';
82: }
83: $output .= '<a href="'.$url.'">'.&mt('Link to PDF (for mobile devices)').'</a>';
84: } else {
85: $output .= '<div style="overflow:scroll; -webkit-overflow-scrolling:touch;">'."\n".
86: '<iframe src="'.$url.'" height="100%" width="100%" frameborder="0">'."\n".
87: "$lt{'noif'} $noiframe\n".
88: "</iframe>\n".
89: "</div>\n";
90: }
91: $output .= $endpage;
92: return $output;
93: } else {
94: my $script = &Apache::lonhtmlcommon::scripttag(<<SCRIPT);
95: \$(document).ready( function() {
96: \$(window).unbind('resize').resize(function(){
97: var header;
98: var offset = 5;
99: var height = 0;
100: var hdrtop = 0;
101: if (\$('div.LC_head_subbox:first').length) {
102: header = \$('div.LC_head_subbox:first');
103: offset = 9;
104: } else {
105: if (\$('#LC_breadcrumbs').length) {
106: header = \$('#LC_breadcrumbs');
107: }
108: }
109: if (header.length) {
110: height = header.height();
111: hdrtop = header.position().top;
112: }
113: var pos = height + hdrtop + offset;
114: \$('.LC_iframecontainer').css('top', pos);
115: });
116: });
117: window.onload = function(){ \$(window).trigger('resize') };
118: SCRIPT
119: # javascript will position the iframe if window was resized (or zoomed)
120: return <<ENDFRAME;
121: $startpage
122: $script
123: <div class="LC_iframecontainer">
124: <iframe src="$url">$lt{'noif'} $noiframe</iframe>
125: </div>
126: $endpage
127: ENDFRAME
128: }
129: }
130:
131: sub handler {
132: my $r=shift;
133: &Apache::loncommon::content_type($r,'text/html');
134: $r->send_http_header;
135:
136: return OK if $r->header_only;
137:
138: my $url = $r->uri;
139: my ($is_ext,$brcrum,$absolute,$is_pdf);
140:
141: for ($url){
142: s|^/adm/wrapper||;
143: $is_ext = $_ =~ s|^/ext/|http://|;
144: s|http://https://|https://|;
145: s|:|:|g;
146: }
147:
148: if ($url =~ /\.pdf$/i) {
149: $is_pdf = 1;
150: }
151:
152: if ($is_ext) {
153: my $hostname = $r->hostname();
154: my $lonhost = &Apache::lonnet::host_from_dns($hostname);
155: if ($lonhost) {
156: my $actual = &Apache::lonnet::absolute_url($hostname);
157: my $expected = $Apache::lonnet::protocol{$lonhost}.'://'.$hostname;
158: unless ($actual eq $expected) {
159: $absolute = $expected;
160: }
161: }
162: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
163: ['forceedit','register','folderpath','symb','idx','title']);
164: if (($env{'form.forceedit'}) &&
165: (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
166: (($env{'form.folderpath'} =~ /^supplemental/) ||
167: ($env{'form.symb'} =~ /^uploaded/))) {
168: $r->print(
169: &Apache::lonextresedit::display_editor($url,$env{'form.folderpath'},
170: $env{'form.symb'},
171: $env{'form.idx'}));
172: return OK;
173: } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
174: my $crstype = &Apache::loncommon::course_type();
175: my $title = $env{'form.title'};
176: if ($title eq '') {
177: $title = &mt('External Resource');
178: }
179: $brcrum =
180: &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
181: }
182: }
183:
184: #
185: # Actual URL
186: #
187: if ($url=~/$LONCAPA::assess_re/) {
188: #
189: # This is uploaded homework
190: #
191: $env{'request.state'}='uploaded';
192: &Apache::lonhomework::renderpage($r,$url);
193: } else {
194: #
195: # This is not homework
196: #
197: if ($is_ext) {
198: $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
199: $ENV{'QUERY_STRING'} =~ s/\&$//;
200: }
201:
202: unless ($ENV{'QUERY_STRING'} eq '') {
203: $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
204: }
205:
206: # encrypt url if not external
207: &Apache::lonenc::check_encrypt(\$url) if $url !~ /^https?\:/ ;
208:
209: $r->print( wrapper($url,$brcrum,$absolute,$is_ext,$is_pdf) );
210:
211: } # not just the menu
212:
213: return OK;
214: } # handler
215:
216: 1;
217: __END__
218:
219: =pod
220:
221: =head1 NAME
222:
223: Apache::lonwrapper - External and binary file management.
224:
225: =head1 SYNOPSIS
226:
227: Wrapper for external and binary files as standalone resources. Edit handler for rat maps; TeX content handler.
228:
229: This is part of the LearningOnline Network with CAPA project
230: described at http://www.lon-capa.org.
231:
232: =head1 Subroutines
233:
234: =over
235:
236: =item wrapper($url,$brcrum,$absolute,$is_ext,$is_pdf))
237:
238: =over
239:
240: =item $url
241:
242: url to display by including in an iframe within a
243: LON-CAPA page which has a standard LON-CAPA inline menu.
244:
245: =item $brcrum
246:
247: breadcrumbs for unregistered urls
248: (i.e., external resources in Supplemental Content).
249:
250: =item $absolute
251:
252: contains protocol (http or https) followed by
253: the hostname, if menu items in the standard LON-CAPA
254: interface created by the call to loncommon::start_page()
255: within &wrapper() need to use absolute URLs rather than
256: relative URLs.
257:
258: That will be the case where an external resource has been
259: served from port 80, when the server customarily serves
260: requests using Apache/SSL (i.e., port 443). mod_rewrite
261: is used to switch requests for external resources
262: from https:// to http:// where the the URL of the remote site
263: specified in the resource itself is http://.
264:
265: This is done to avoid default mixed content blocking
266: in Firefox 23 and later, when serving from Apache/SSL.
267:
268: =item $is_ext
269:
270: true if URL is for an external resource.
271:
272: =item $is_pdf
273:
274: true if URL is for a PDF (based on file extension).
275:
276: =back
277:
278: Returns markup for the entire page.
279:
280: =item handler()
281:
282: =back
283:
284: =cut
285:
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