1: # The LearningOnline Network with CAPA
2: # Handler to retrieve an old version of a file
3: #
4: # $Id: lonretrieve.pm,v 1.28 2005/12/12 21:59:12 albertel 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: package Apache::lonretrieve;
32:
33: use strict;
34: use Apache::File;
35: use File::Copy;
36: use Apache::Constants qw(:common :http :methods);
37: use Apache::loncacc;
38: use Apache::loncommon();
39: use Apache::lonlocal;
40: use Apache::lonnet;
41:
42: # ------------------------------------ Interface for selecting previous version
43: sub phaseone {
44: my ($r,$fn,$uname,$udom)=@_;
45: my $docroot=$r->dir_config('lonDocRoot');
46:
47: my $urldir='/res/'.$udom.'/'.$uname.$fn;
48: $urldir=~s/\/[^\/]+$/\//;
49:
50: my $resfn=$docroot.'/res/'.$udom.'/'.$uname.$fn;
51: my $resdir=$resfn;
52: $resdir=~s/\/[^\/]+$/\//;
53:
54: $fn=~/\/([^\/]+)\.(\w+)$/;
55: my $main=$1;
56: my $suffix=$2;
57:
58: if (-e $resfn) {
59: $r->print('<form action=/adm/retrieve method=post>'.
60: '<input type=hidden name=filename value="/~'.$uname.$fn.'">'.
61: '<input type=hidden name=phase value=two>'.
62: '<table border=2><tr><th>'.&mt('Select').'</th><th>'.
63: &mt('Version').'</th>'.
64: '<th>'.&mt('Published on ...').'</th>'.
65: '<th>'.&mt('Metadata').'</th></tr>');
66:
67: opendir(DIR,$resdir);
68: my @files = grep(/^\Q$main\E\.(\d+)\.\Q$suffix\E$/,readdir(DIR));
69: @files = sort {
70: my ($aver) = ($a=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/);
71: my ($bver) = ($b=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/);
72: return $aver <=> $bver;
73: } (@files);
74: closedir(DIR);
75:
76: foreach my $filename (@files) {
77: if ($filename=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/) {
78: my $version=$1;
79: my $rmtime=&Apache::lonnet::metadata($resdir.'/'.$filename,'lastrevisiondate');
80: $r->print('<tr><td><input type=radio name=version value="'.
81: $version.'"></td><td>'.&mt('Previously published version').' '.$version.'</td><td>'.
82: localtime($rmtime).'</td><td>'.
83: '<a href="'.$urldir.$filename.'.meta" target=cat>'.
84: &mt('Metadata Version').' '.$version.'</a>');
85: if (&Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
86: $r->print(
87: ' <a target=cat href="/adm/diff?filename=/~'.
88: $uname.$fn.
89: '&versiontwo=priv&versionone='.$version.
90: '">'.&mt('Diffs with Version').' '.$version.'</a>');
91: }
92: $r->print('</a></td></tr>');
93: }
94: }
95: closedir(DIR);
96: my $rmtime=&Apache::lonnet::metadata($resfn,'lastrevisiondate');
97: $r->print('<tr><td><input type=radio name=version value="new"></td>'.
98: '<th>'.&mt('Currently public version').'</th><td>'.localtime($rmtime).
99: '</td><td><a href="'.$urldir.$main.'.'.$suffix.'.meta" target=cat>'.
100: &mt('Metadata current version').'</a>');
101: if (&Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
102: $r->print(
103: ' <a target=cat href="/adm/diff?filename=/~'.
104: $uname.$fn.
105: '&versiontwo=priv'.
106: '">'.&mt('Diffs with current Version').'</a>');
107: }
108: $r->print('</td></tr></table><p>'.
109: '<font size=+1 color=red>'.
110: &mt('Retrieval of an old version will overwrite the file currently in construction space').'</font><p>'.
111: '<input type=submit value="'.&mt('Retrieve version').'"></form>');
112: } else {
113: $r->print('<h3>'.&mt('No previous versions published.').'</h3>');
114: }
115: $r->print('<p><a href="/priv/'.$uname.$fn.'">'.&mt('Back to').' '.$fn.
116: '</a></p>');
117: }
118:
119: # ---------------------------------- Interface for presenting specified version
120: sub phasetwo {
121: my ($r,$fn,$uname,$udom)=@_;
122: if ($env{'form.version'}) {
123: my $version=$env{'form.version'};
124: if ($version eq 'new') {
125: $r->print('<h3>'.&mt('Retrieving current (most recent) version').'</h3>');
126: } else {
127: $r->print('<h3>'.&mt('Retrieving old version').' '.$version.'</h3>');
128: }
129: my $logfile;
130: my $ctarget='/home/'.$uname.'/public_html'.$fn;
131: my $vfn=$fn;
132: if ($version ne 'new') {
133: $vfn=~s/\.(\w+)$/\.$version\.$1/;
134: }
135: my $csource=$r->dir_config('lonDocRoot').'/res/'.$udom.'/'.$uname.$vfn;
136: unless ($logfile=Apache::File->new('>>'.$ctarget.'.log')) {
137: $r->print(
138: '<font color=red>'.&mt('No write permission to user directory, FAIL').'</font>');
139: }
140: print $logfile
141: "\n\n================= Retrieve ".localtime()." ================\n".
142: "Version: $version\nSource: $csource\nTarget: $ctarget\n";
143: $r->print('<p>'.&mt('Copying file').': ');
144: if (copy($csource,$ctarget)) {
145: $r->print('ok<p>');
146: print $logfile "Copied sucessfully.\n\n";
147: } else {
148: my $error=$!;
149: $r->print('fail, '.$error.'<p>');
150: print $logfile "Copy failed: $error\n\n";
151: }
152: $r->print('<font size=+2><a href="/priv/'.$uname.$fn.
153: '">'.&mt('Back to').' '.$fn.'</a></font>');
154: } else {
155: $r->print(
156: '<font size=+1 color=red>'.&mt('Please pick a version to retrieve').'</font><p>');
157: &phaseone($r,$fn,$uname,$udom);
158: }
159: }
160:
161: # ---------------------------------------------------------------- Main Handler
162: sub handler {
163:
164: my $r=shift;
165:
166: my $fn;
167:
168:
169: # Get query string for limited number of parameters
170:
171: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
172: ['filename']);
173:
174: if ($env{'form.filename'}) {
175: $fn=$env{'form.filename'};
176: $fn=~s/^http\:\/\/[^\/]+//;
177: } else {
178: $r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
179: ' unspecified filename for retrieval', $r->filename);
180: return HTTP_NOT_FOUND;
181: }
182:
183: unless ($fn) {
184: $r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
185: ' trying to retrieve non-existing file', $r->filename);
186: return HTTP_NOT_FOUND;
187: }
188:
189: # ----------------------------------------------------------- Start page output
190: my $uname;
191: my $udom;
192:
193: ($uname,$udom)=
194: &Apache::loncacc::constructaccess($fn,$r->dir_config('lonDefDomain'));
195: unless (($uname) && ($udom)) {
196: $r->log_reason($uname.' at '.$udom.
197: ' trying to publish file '.$env{'form.filename'}.
198: ' ('.$fn.') - not authorized',
199: $r->filename);
200: return HTTP_NOT_ACCEPTABLE;
201: }
202:
203: $fn=~s/\/\~(\w+)//;
204:
205: &Apache::loncommon::content_type($r,'text/html');
206: $r->send_http_header;
207:
208: $r->print('<html><head><title>LON-CAPA Construction Space</title></head>');
209:
210: $r->print(&Apache::loncommon::bodytag('Retrieve Published Resources'));
211:
212:
213: $r->print('<h1>'.&mt('Retrieve previous versions of').' <tt>'.$fn.'</tt></h1>');
214:
215: if (($uname ne $env{'user.name'}) || ($udom ne $env{'user.domain'})) {
216: $r->print('<h3><font color=red>'.&mt('Co-Author').': '.$uname.
217: &mt(' at ').$udom.
218: '</font></h3>');
219: }
220:
221:
222: if ($env{'form.phase'} eq 'two') {
223: &phasetwo($r,$fn,$uname,$udom);
224: } else {
225: &phaseone($r,$fn,$uname,$udom);
226: }
227:
228: $r->print('</body></html>');
229: return OK;
230: }
231:
232: 1;
233: __END__
234:
235: =head1 NAME
236:
237: Apache::lonretrieve - retrieves an old version of a file
238:
239: =head1 SYNOPSIS
240:
241: Invoked by /etc/httpd/conf/srm.conf:
242:
243: <Location /adm/retrieve>
244: PerlAccessHandler Apache::lonacc
245: SetHandler perl-script
246: PerlHandler Apache::lonretrieve
247: ErrorDocument 403 /adm/login
248: ErrorDocument 404 /adm/notfound.html
249: ErrorDocument 406 /adm/unauthorized.html
250: ErrorDocument 500 /adm/errorhandler
251: </Location>
252:
253: =head1 INTRODUCTION
254:
255: This module retrieves an old published version of a file.
256:
257: This is part of the LearningOnline Network with CAPA project
258: described at http://www.lon-capa.org.
259:
260: =head1 HANDLER SUBROUTINE
261:
262: This routine is called by Apache and mod_perl.
263:
264: =over 4
265:
266: =item *
267:
268: Get query string for limited number of parameters
269:
270: =item *
271:
272: Start page output
273:
274: =item *
275:
276: print phase relevant output
277:
278: =item *
279:
280: (phase one is to select version; phase two retrieves version)
281:
282: =back
283:
284: =head1 OTHER SUBROUTINES
285:
286: =over 4
287:
288: =item *
289:
290: phaseone() : Interface for selecting previous version.
291:
292: =item *
293:
294: phasetwo() : Interface for presenting specified version.
295:
296: =back
297:
298: =cut
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