1: # The LearningOnline Network with CAPA
2: # Handler to retrieve an old version of a file
3: #
4: # $Id: lonretrieve.pm,v 1.26 2005/01/05 17:38:27 www 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:
41: # ------------------------------------ Interface for selecting previous version
42: sub phaseone {
43: my ($r,$fn,$uname,$udom)=@_;
44: my $docroot=$r->dir_config('lonDocRoot');
45:
46: my $urldir='/res/'.$udom.'/'.$uname.$fn;
47: $urldir=~s/\/[^\/]+$/\//;
48:
49: my $resfn=$docroot.'/res/'.$udom.'/'.$uname.$fn;
50: my $resdir=$resfn;
51: $resdir=~s/\/[^\/]+$/\//;
52:
53: $fn=~/\/([^\/]+)\.(\w+)$/;
54: my $main=$1;
55: my $suffix=$2;
56:
57: if (-e $resfn) {
58: $r->print('<form action=/adm/retrieve method=post>'.
59: '<input type=hidden name=filename value="/~'.$uname.$fn.'">'.
60: '<input type=hidden name=phase value=two>'.
61: '<table border=2><tr><th>'.&mt('Select').'</th><th>'.
62: &mt('Version').'</th>'.
63: '<th>'.&mt('Published on ...').'</th>'.
64: '<th>'.&mt('Metadata').'</th></tr>');
65: my $filename;
66: opendir(DIR,$resdir);
67: while ($filename=readdir(DIR)) {
68: if ($filename=~/^\Q$main\E\.(\d+)\.\Q$suffix\E$/) {
69: my $version=$1;
70: my $rmtime=&Apache::lonnet::metadata($resdir.'/'.$filename,'lastrevisiondate');
71: $r->print('<tr><td><input type=radio name=version value="'.
72: $version.'"></td><td>'.&mt('Previously published version').' '.$version.'</td><td>'.
73: localtime($rmtime).'</td><td>'.
74: '<a href="'.$urldir.$filename.'.meta" target=cat>'.
75: &mt('Metadata Version').' '.$version.'</a>');
76: if (&Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
77: $r->print(
78: ' <a target=cat href="/adm/diff?filename=/~'.
79: $uname.$fn.
80: '&versiontwo=priv&versionone='.$version.
81: '">'.&mt('Diffs with Version').' '.$version.'</a>');
82: }
83: $r->print('</a></td></tr>');
84: }
85: }
86: closedir(DIR);
87: my $rmtime=&Apache::lonnet::metadata($resfn,'lastrevisiondate');
88: $r->print('<tr><td><input type=radio name=version value="new"></td>'.
89: '<th>'.&mt('Currently public version').'</th><td>'.localtime($rmtime).
90: '</td><td><a href="'.$urldir.$main.'.'.$suffix.'.meta" target=cat>'.
91: &mt('Metadata current version').'</a>');
92: if (&Apache::loncommon::fileembstyle($suffix) eq 'ssi') {
93: $r->print(
94: ' <a target=cat href="/adm/diff?filename=/~'.
95: $uname.$fn.
96: '&versiontwo=priv'.
97: '">'.&mt('Diffs with current Version').'</a>');
98: }
99: $r->print('</td></tr></table><p>'.
100: '<font size=+1 color=red>'.
101: &mt('Retrieval of an old version will overwrite the file currently in construction space').'</font><p>'.
102: '<input type=submit value="'.&mt('Retrieve version').'"></form>');
103: } else {
104: $r->print('<h3>'.&mt('No previous versions published.').'</h3>');
105: }
106: $r->print('<p><a href="/priv/'.$uname.$fn.'">'.&mt('Back to').' '.$fn.
107: '</a></p>');
108: }
109:
110: # ---------------------------------- Interface for presenting specified version
111: sub phasetwo {
112: my ($r,$fn,$uname,$udom)=@_;
113: if ($ENV{'form.version'}) {
114: my $version=$ENV{'form.version'};
115: if ($version eq 'new') {
116: $r->print('<h3>'.&mt('Retrieving current (most recent) version').'</h3>');
117: } else {
118: $r->print('<h3>'.&mt('Retrieving old version').' '.$version.'</h3>');
119: }
120: my $logfile;
121: my $ctarget='/home/'.$uname.'/public_html'.$fn;
122: my $vfn=$fn;
123: if ($version ne 'new') {
124: $vfn=~s/\.(\w+)$/\.$version\.$1/;
125: }
126: my $csource=$r->dir_config('lonDocRoot').'/res/'.$udom.'/'.$uname.$vfn;
127: unless ($logfile=Apache::File->new('>>'.$ctarget.'.log')) {
128: $r->print(
129: '<font color=red>'.&mt('No write permission to user directory, FAIL').'</font>');
130: }
131: print $logfile
132: "\n\n================= Retrieve ".localtime()." ================\n".
133: "Version: $version\nSource: $csource\nTarget: $ctarget\n";
134: $r->print('<p>'.&mt('Copying file').': ');
135: if (copy($csource,$ctarget)) {
136: $r->print('ok<p>');
137: print $logfile "Copied sucessfully.\n\n";
138: } else {
139: my $error=$!;
140: $r->print('fail, '.$error.'<p>');
141: print $logfile "Copy failed: $error\n\n";
142: }
143: $r->print('<font size=+2><a href="/priv/'.$uname.$fn.
144: '">'.&mt('Back to').' '.$fn.'</a></font>');
145: } else {
146: $r->print(
147: '<font size=+1 color=red>'.&mt('Please pick a version to retrieve').'</font><p>');
148: &phaseone($r,$fn,$uname,$udom);
149: }
150: }
151:
152: # ---------------------------------------------------------------- Main Handler
153: sub handler {
154:
155: my $r=shift;
156:
157: my $fn;
158:
159:
160: # Get query string for limited number of parameters
161:
162: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
163: ['filename']);
164:
165: if ($ENV{'form.filename'}) {
166: $fn=$ENV{'form.filename'};
167: $fn=~s/^http\:\/\/[^\/]+//;
168: } else {
169: $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
170: ' unspecified filename for retrieval', $r->filename);
171: return HTTP_NOT_FOUND;
172: }
173:
174: unless ($fn) {
175: $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.
176: ' trying to retrieve non-existing file', $r->filename);
177: return HTTP_NOT_FOUND;
178: }
179:
180: # ----------------------------------------------------------- Start page output
181: my $uname;
182: my $udom;
183:
184: ($uname,$udom)=
185: &Apache::loncacc::constructaccess($fn,$r->dir_config('lonDefDomain'));
186: unless (($uname) && ($udom)) {
187: $r->log_reason($uname.' at '.$udom.
188: ' trying to publish file '.$ENV{'form.filename'}.
189: ' ('.$fn.') - not authorized',
190: $r->filename);
191: return HTTP_NOT_ACCEPTABLE;
192: }
193:
194: $fn=~s/\/\~(\w+)//;
195:
196: &Apache::loncommon::content_type($r,'text/html');
197: $r->send_http_header;
198:
199: $r->print('<html><head><title>LON-CAPA Construction Space</title></head>');
200:
201: $r->print(&Apache::loncommon::bodytag('Retrieve Published Resources'));
202:
203:
204: $r->print('<h1>'.&mt('Retrieve previous versions of').' <tt>'.$fn.'</tt></h1>');
205:
206: if (($uname ne $ENV{'user.name'}) || ($udom ne $ENV{'user.domain'})) {
207: $r->print('<h3><font color=red>'.&mt('Co-Author').': '.$uname.
208: &mt(' at ').$udom.
209: '</font></h3>');
210: }
211:
212:
213: if ($ENV{'form.phase'} eq 'two') {
214: &phasetwo($r,$fn,$uname,$udom);
215: } else {
216: &phaseone($r,$fn,$uname,$udom);
217: }
218:
219: $r->print('</body></html>');
220: return OK;
221: }
222:
223: 1;
224: __END__
225:
226: =head1 NAME
227:
228: Apache::lonretrieve - retrieves an old version of a file
229:
230: =head1 SYNOPSIS
231:
232: Invoked by /etc/httpd/conf/srm.conf:
233:
234: <Location /adm/retrieve>
235: PerlAccessHandler Apache::lonacc
236: SetHandler perl-script
237: PerlHandler Apache::lonretrieve
238: ErrorDocument 403 /adm/login
239: ErrorDocument 404 /adm/notfound.html
240: ErrorDocument 406 /adm/unauthorized.html
241: ErrorDocument 500 /adm/errorhandler
242: </Location>
243:
244: =head1 INTRODUCTION
245:
246: This module retrieves an old published version of a file.
247:
248: This is part of the LearningOnline Network with CAPA project
249: described at http://www.lon-capa.org.
250:
251: =head1 HANDLER SUBROUTINE
252:
253: This routine is called by Apache and mod_perl.
254:
255: =over 4
256:
257: =item *
258:
259: Get query string for limited number of parameters
260:
261: =item *
262:
263: Start page output
264:
265: =item *
266:
267: print phase relevant output
268:
269: =item *
270:
271: (phase one is to select version; phase two retrieves version)
272:
273: =back
274:
275: =head1 OTHER SUBROUTINES
276:
277: =over 4
278:
279: =item *
280:
281: phaseone() : Interface for selecting previous version.
282:
283: =item *
284:
285: phasetwo() : Interface for presenting specified version.
286:
287: =back
288:
289: =cut
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