1: # The LearningOnline Network with CAPA
2: # Handler to retrieve an old version of a file
3: #
4: # $Id: lonretrieve.pm,v 1.35 2008/11/10 14:11:08 jms 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:
31: =head1 NAME
32:
33: Apache::lonretrieve - retrieves an old version of a file
34:
35: =head1 SYNOPSIS
36:
37: Invoked by /etc/httpd/conf/srm.conf:
38:
39: <Location /adm/retrieve>
40: PerlAccessHandler Apache::lonacc
41: SetHandler perl-script
42: PerlHandler Apache::lonretrieve
43: ErrorDocument 403 /adm/login
44: ErrorDocument 404 /adm/notfound.html
45: ErrorDocument 406 /adm/unauthorized.html
46: ErrorDocument 500 /adm/errorhandler
47: </Location>
48:
49: =head1 INTRODUCTION
50:
51: This module retrieves an old published version of a file.
52:
53: This is part of the LearningOnline Network with CAPA project
54: described at http://www.lon-capa.org.
55:
56: =head1 HANDLER SUBROUTINE
57:
58: This routine is called by Apache and mod_perl.
59:
60: =over 4
61:
62: =item *
63:
64: Get query string for limited number of parameters
65:
66: =item *
67:
68: Start page output
69:
70: =item *
71:
72: print phase relevant output
73:
74: =item *
75:
76: (phase one is to select version; phase two retrieves version)
77:
78: =back
79:
80: =head1 OTHER SUBROUTINES
81:
82: =over 4
83:
84: =item *
85:
86: phaseone() : Interface for selecting previous version.
87:
88: =item *
89:
90: phasetwo() : Interface for presenting specified version.
91:
92: =back
93:
94: =cut
95:
96: package Apache::lonretrieve;
97:
98: use strict;
99: use Apache::File;
100: use File::Copy;
101: use Apache::Constants qw(:common :http :methods);
102: use Apache::loncacc;
103: use Apache::loncommon();
104: use Apache::lonlocal;
105: use Apache::lonnet;
106: use LONCAPA();
107:
108: # ------------------------------------ Interface for selecting previous version
109: sub phaseone {
110: my ($r,$fn,$uname,$udom)=@_;
111: my $docroot=$r->dir_config('lonDocRoot');
112:
113: my $urldir='/res/'.$udom.'/'.$uname.$fn;
114: $urldir=~s/\/[^\/]+$/\//;
115:
116: my $resfn=$docroot.'/res/'.$udom.'/'.$uname.$fn;
117: my $resdir=$resfn;
118: $resdir=~s/\/[^\/]+$/\//;
119:
120: my ($main,$suffix,$is_meta) = &get_file_info($fn);
121:
122: if (-e $resfn) {
123: $r->print('<form action="/adm/retrieve" method="POST">'.
124: '<input type="hidden" name="filename" value="/~'.$uname.$fn.'" />'.
125: '<input type="hidden" name="phase" value="two" />'.
126: &Apache::loncommon::start_data_table().
127: &Apache::loncommon::start_data_table_header_row().
128: '<th>'.&mt('Select').'</th>'.
129: '<th>'.&mt('Version').'</th>'.
130: '<th>'.&mt('Published on ...').'</th>');
131: if (!$is_meta) {
132: $r->print('<th>'.&mt('Metadata').'</th>');
133: }
134: if ($is_meta
135: || &Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
136: $r->print('<th>'.&mt('Diffs').'</th>');
137: }
138: $r->print(&Apache::loncommon::end_data_table_header_row());
139:
140: opendir(DIR,$resdir);
141: my @files = grep(/^\Q$main\E\.(\d+)\.\Q$suffix\E$/,readdir(DIR));
142: @files = sort {
143: my ($aver) = ($a=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/);
144: my ($bver) = ($b=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/);
145: return $aver <=> $bver;
146: } (@files);
147: closedir(DIR);
148:
149: foreach my $filename (@files) {
150: if ($filename=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/) {
151: my $version=$1;
152: my $rmtime=&Apache::lonnet::metadata($resdir.'/'.$filename,'lastrevisiondate');
153: $r->print(&Apache::loncommon::start_data_table_row().
154: '<td><input type="radio" name="version" value="'.
155: $version.'" /></td><td>'.&mt('Previously published version').' '.$version.'</td><td>'.
156: localtime($rmtime).'</td>');
157:
158: if (!$is_meta) {
159: $r->print('<td><a href="'.$urldir.$filename.'.meta" target=cat>'.
160: &mt('Metadata Version').' '.$version.'</a></td>');
161: }
162: if ($is_meta
163: || &Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
164: $r->print(
165: '<td><a target="cat" href="/adm/diff?filename=/~'.
166: $uname.$fn.
167: '&versiontwo=priv&versionone='.$version.
168: '">'.&mt('Diffs with Version').' '.$version.
169: '</a></td>');
170: }
171: $r->print(&Apache::loncommon::end_data_table_row());
172: }
173: }
174: closedir(DIR);
175: my $rmtime=&Apache::lonnet::metadata($resfn,'lastrevisiondate');
176: $r->print(&Apache::loncommon::start_data_table_row().
177: '<td><input type="radio" name="version" value="new" /></td>'.
178: '<td><b>'.&mt('Currently published version').'</b></td><td>'.localtime($rmtime).
179: '</td>');
180: if (!$is_meta) {
181: $r->print('<td><a href="'.$urldir.$main.'.'.$suffix.'.meta" target=cat>'.
182: &mt('Metadata current version').'</a></td>');
183: }
184: if ($is_meta
185: || &Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
186: $r->print(
187: '<td><a target="cat" href="/adm/diff?filename=/~'.
188: $uname.$fn.
189: '&versiontwo=priv'.
190: '">'.&mt('Diffs with current Version').'</a></td>');
191: }
192: $r->print(&Apache::loncommon::end_data_table_row().
193: &Apache::loncommon::end_data_table().
194: '<p>'.'<span class="LC_warning">'.
195: &mt('Retrieval of an old version will overwrite the file currently in construction space').'</span></p>');
196: if (!$is_meta) {
197: $r->print('<p>'.'<span class="LC_warning">'.
198: &mt('This will only retrieve the resource, if you want to retrieve the metadata you will need to do that separately.').
199: '</span></p>');
200: }
201: $r->print('<input type="submit" value="'.&mt('Retrieve version').'" /></form>');
202: } else {
203: $r->print('<h3>'.&mt('No previous versions published.').'</h3>');
204: }
205: $r->print('<p><a href="/priv/'.$uname.$fn.'">'.&mt('Back to').' '.$fn.
206: '</a></p>');
207: }
208:
209: # ---------------------------------- Interface for presenting specified version
210: sub phasetwo {
211: my ($r,$fn,$uname,$udom)=@_;
212: if ($env{'form.version'}) {
213: my $version=$env{'form.version'};
214: if ($version eq 'new') {
215: $r->print('<h3>'.&mt('Retrieving current (most recent) version').'</h3>');
216: } else {
217: $r->print('<h3>'.&mt('Retrieving old version').' '.$version.'</h3>');
218: }
219: my ($main,$suffix,$is_meta) = &get_file_info($fn);
220:
221: my $logfile;
222: my $ctarget='/home/'.$uname.'/public_html'.$fn;
223: my $vfn=$fn;
224: if ($version ne 'new') {
225: $vfn=~s/\.(\Q$suffix\E)$/\.$version\.$1/;
226: }
227:
228: my $csource=$r->dir_config('lonDocRoot').'/res/'.$udom.'/'.$uname.$vfn;
229:
230: my $logname = $ctarget;
231: if ($is_meta) { $logname =~ s/\.meta$//; }
232: $logname = $ctarget.'.log';
233: unless ($logfile=Apache::File->new('>>'.$logname)) {
234: $r->print(
235: '<font color=red>'.&mt('No write permission to user directory, FAIL').'</font>');
236: }
237: print $logfile
238: "\n\n================= Retrieve ".localtime()." ================\n".
239: "Version: $version\nSource: $csource\nTarget: $ctarget\n";
240: $r->print('<p>'.&mt('Copying file').': ');
241: if (copy($csource,$ctarget)) {
242: $r->print('ok<p>');
243: print $logfile "Copied sucessfully.\n\n";
244: } else {
245: my $error=$!;
246: $r->print('fail, '.$error.'<p>');
247: print $logfile "Copy failed: $error\n\n";
248: }
249: $r->print('<font size=+2><a href="/priv/'.$uname.$fn.
250: '">'.&mt('Back to').' '.$fn.'</a></font>');
251: } else {
252: $r->print('<span class="LC_warning">'.&mt('Please pick a version to retrieve').'</span><p>');
253: &phaseone($r,$fn,$uname,$udom);
254: }
255: }
256:
257: sub get_file_info {
258: my ($fn) = @_;
259: my ($main,$suffix) = ($fn=~/\/([^\/]+)\.(\w+)$/);
260: my $is_meta=0;
261: if ($suffix eq 'meta') {
262: $is_meta = 1;
263: ($main,$suffix) = ($main=~/(.+)\.(\w+)$/);
264: $suffix .= '.meta';
265: }
266: return ($main,$suffix,$is_meta);
267: }
268:
269: # ---------------------------------------------------------------- Main Handler
270: sub handler {
271:
272: my $r=shift;
273:
274: my $fn;
275:
276:
277: # Get query string for limited number of parameters
278:
279: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
280: ['filename']);
281:
282: if ($env{'form.filename'}) {
283: $fn=$env{'form.filename'};
284: $fn=~s/^http\:\/\/[^\/]+//;
285: } else {
286: $r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
287: ' unspecified filename for retrieval', $r->filename);
288: return HTTP_NOT_FOUND;
289: }
290:
291: unless ($fn) {
292: $r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
293: ' trying to retrieve non-existing file', $r->filename);
294: return HTTP_NOT_FOUND;
295: }
296:
297: # ----------------------------------------------------------- Start page output
298: my $uname;
299: my $udom;
300:
301: ($uname,$udom)=
302: &Apache::loncacc::constructaccess($fn,$r->dir_config('lonDefDomain'));
303: unless (($uname) && ($udom)) {
304: $r->log_reason($uname.' at '.$udom.
305: ' trying to publish file '.$env{'form.filename'}.
306: ' ('.$fn.') - not authorized',
307: $r->filename);
308: return HTTP_NOT_ACCEPTABLE;
309: }
310:
311: $fn=~s{/~($LONCAPA::username_re)}{};
312:
313: &Apache::loncommon::content_type($r,'text/html');
314: $r->send_http_header;
315:
316: $r->print(&Apache::loncommon::start_page('Retrieve Published Resources'));
317:
318:
319: $r->print('<h1>'.&mt('Retrieve previous versions of').' <tt>'.$fn.'</tt></h1>');
320:
321: if (($uname ne $env{'user.name'}) || ($udom ne $env{'user.domain'})) {
322: $r->print('<h3><span class="LC_diff_coauthor">'.&mt('Co-Author').': '.$uname.
323: &mt(' at ').$udom.
324: '</span></h3>');
325: }
326:
327:
328: if ($env{'form.phase'} eq 'two') {
329: &phasetwo($r,$fn,$uname,$udom);
330: } else {
331: &phaseone($r,$fn,$uname,$udom);
332: }
333:
334: $r->print(&Apache::loncommon::end_page());
335: return OK;
336: }
337:
338: 1;
339: __END__
340:
341:
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