1: # The LearningOnline Network with CAPA
2: # Handler to show differences between file versions
3: #
4: # $Id: londiff.pm,v 1.28.2.1 2011/11/07 15:18:13 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:
31:
32:
33: package Apache::londiff;
34:
35: use strict;
36: use Apache::File;
37: use File::Copy;
38: use File::Compare;
39: use Algorithm::Diff qw(diff);
40: use Apache::Constants qw(:common :http :methods);
41: use Apache::loncacc();
42: use Apache::lonnet;
43: use Apache::loncommon();
44: use Apache::lonretrieve();
45: use Apache::lonlocal;
46: use LONCAPA();
47:
48: sub get_split_file {
49: my ($fn,$style)=@_;
50: my $f1;
51: my @f1;
52: if ($style eq 'local') {
53: if (-e $fn) {
54: my $fh=Apache::File->new($fn);
55: my $line;
56: while($line=<$fh>) {
57: $f1.=$line;
58: }
59: }
60: } elsif ($style eq 'remote') {
61: $f1=&Apache::lonnet::getfile($fn);
62: }
63: @f1=split(/\r\n|\r|\n/,$f1);
64: return @f1;
65: }
66:
67: sub are_different_files {
68: my ($fileone,$filetwo)=@_;
69: return &compare($fileone,$filetwo);
70: }
71:
72: sub handler {
73:
74: my $r=shift;
75: # Get query string for limited number of parameters
76:
77: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
78: ['filename','versiontwo',
79: 'versionone','filetwo']);
80:
81: # Check permissions
82: my $allowed=0;
83: my $cuname=$env{'user.name'};
84: my $cudom=$env{'user.domain'};
85:
86: if ($env{'form.filename'}=~ m{^/res/}) {
87: if (&Apache::lonnet::allowed('bre',$env{'form.filename'})) {
88: if ($env{'request.course.id'}) {
89: if (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
90: $allowed = 1;
91: }
92: } else {
93: $allowed = 1;
94: }
95: } elsif (&Apache::lonnet::allowed('bro',$env{'form.filename'})) {
96: $allowed = 1;
97: }
98: if ($allowed) {
99: ($cudom,$cuname,$env{'form.filename'})=
100: ($env{'form.filename'}=~m{^/res/($LONCAPA::domain_re)/($LONCAPA::username_re)(/.*)$});
101:
102: if (($env{'form.versionone'} eq 'priv') || ($env{'form.versiontwo'} eq 'priv')) {
103: my ($cstrname,$cstrdom) =
104: &Apache::loncacc::constructaccess("/priv/$cuname".$env{'form.filename'},$cudom);
105: unless (($cstrname eq $cuname) && ($cstrdom eq $cudom)) {
106: $allowed = 0;
107: }
108: }
109: }
110: } else {
111: ($cuname,$cudom)=
112: &Apache::loncacc::constructaccess($env{'form.filename'},
113: $r->dir_config('lonDefDomain'));
114: if ($cuname ne '' && $cudom ne '') {
115: $allowed = 1;
116: } else {
117: $r->log_reason($env{'user.name'}.':'.$env{'user.domain'}.
118: ' trying to get diffs file '.$env{'form.filename'}.
119: ' - not authorized',
120: $r->filename);
121: }
122: }
123: unless ($allowed) {
124: return HTTP_NOT_ACCEPTABLE;
125: }
126:
127: # Get the files
128:
129: my $efn=$env{'form.filename'};
130:
131: $efn=~s{/\~($LONCAPA::username_re)}{}g;
132:
133: my @f1=();
134: my @f2=();
135:
136: &Apache::loncommon::content_type($r,'text/html');
137: $r->send_http_header;
138:
139: $r->print(&Apache::loncommon::start_page('Resource Differences',undef,
140: {'no_nav_bar' => 1, }));
141:
142: $r->print(($env{'form.filetwo'}?'':&mt('Compare versions of')).
143: ' <span class="LC_filename">'.$efn.'</span>');
144:
145: if (($cuname ne $env{'user.name'}) || ($cudom ne $env{'user.domain'})) {
146: $r->print('<p><span class="LC_info">'
147: .&mt('Co-Author [_1]'
148: ,&Apache::loncommon::plainname($cuname,$cudom)
149: .' ('.$cuname.':'.$cudom.')')
150: .'</span></p>'
151: );
152: }
153:
154:
155: if (&Apache::loncommon::fileembstyle(($efn=~/\.(\w+)$/)) eq 'ssi'
156: || $efn =~ /\.meta$/) {
157: $r->print('<p><span class="LC_diff_removed">');
158: if ($env{'form.versionone'} eq 'priv') {
159: my $fn='/home/'.$cuname.'/public_html/'.$efn;
160: @f1=&get_split_file($fn,'local');
161: $r->print('<b>'.&mt('Construction Space Version').'</b>');
162: } else {
163: my $fn=
164: '/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
165: if ($env{'form.versionone'}) {
166: my ($main,$suffix,$is_meta)=
167: &Apache::lonretrieve::get_file_info($efn);
168:
169: $fn.=($efn =~m|(.*/)[^/]+|)[0];
170: # add on to $fn the path information in $efn
171: $fn.=$main.'.'.$env{'form.versionone'}.'.'.$suffix;
172: $r->print('<b>'.&mt('Version').' '.$env{'form.versionone'}.'</b>');
173: } else {
174: $fn.=$efn;
175: $r->print('<b>'.&mt('Current Version').'</b>');
176: }
177: @f1=&get_split_file($fn,'remote');
178: }
179:
180: $r->print('</span><br />'.&mt('versus').'<br /><span class="LC_diff_added">');
181:
182: if ($env{'form.filetwo'}) {
183: my $efn2=$env{'form.filetwo'};
184: $efn2=~s{/\~($LONCAPA::username_re)}{}g;
185: my $fn='/home/'.$cuname.'/public_html/'.$efn2;
186: @f2=&get_split_file($fn,'local');
187: $r->print('<tt>'.$efn2.'</tt>');
188: } elsif ($env{'form.versiontwo'} eq 'priv') {
189: my $fn='/home/'.$cuname.'/public_html/'.$efn;
190: @f2=&get_split_file($fn,'local');
191: $r->print('<b>'.&mt('Construction Space Version').'</b>');
192: } else {
193: my $fn=
194: '/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
195: if ($env{'form.versiontwo'}) {
196: my ($main,$suffix,$is_meta)=
197: &Apache::lonretrieve::get_file_info($efn);
198: # add on to $fn the path information in $efn
199: $fn.=($efn =~m|(.*/)[^/]+|)[0];
200: $fn.=$main.'.'.$env{'form.versiontwo'}.'.'.$suffix;
201: $r->print('<b>'.&mt('Version').' '.$env{'form.versiontwo'}.'</b>');
202: } else {
203: $fn.=$efn;
204: $r->print('<b>'.&mt('Current Version').'</b>');
205: }
206: @f2=&get_split_file($fn,'remote');
207: }
208: $r->print('</span></p>');
209: # Run diff
210:
211: my $diffs = diff(\@f1, \@f2);
212:
213: if (@$diffs) {
214: # Start page output
215: my $chunk;
216: my $line;
217: $r->print('<pre>');
218: foreach $chunk (@$diffs) {
219: foreach $line (@$chunk) {
220: my ($sign, $lineno, $text) = @$line;
221: $text=&HTML::Entities::encode($text,'<>&"');
222: $lineno=substr($lineno.' ',0,7);
223: $r->print('<span class="'.(($sign eq '+')?'LC_diff_added'
224: :'LC_diff_removed').'">'.
225: $sign.' '.$lineno.' '.$text."</span>\n");
226: }
227: $r->print("</pre><hr /><pre>\n");
228: }
229: $r->print('</pre>');
230: } else {
231: $r->print('<p class="LC_info">'.&mt('No differences found').'</p>');
232: }
233: } else {
234: $r->print('<h1><span class="LC_warning">'.&mt('Binary File').'</span></h1>');
235: }
236: $r->print('<center><a href="javascript:window.close();">'.&mt('Close This Window').'</a></center>');
237: $r->print(&Apache::loncommon::end_page());
238: return OK;
239: }
240:
241:
242: 1;
243: __END__
244:
245:
246: =pod
247:
248: =head1 NAME
249:
250: Apache::londiff
251:
252: =head1 SYNOPSIS
253:
254: Handler to show difference between two files.
255:
256: This is part of the LearningOnline Network with CAPA project
257: described at http://www.lon-capa.org.
258:
259: =head1 Subroutines
260:
261: =over
262:
263: =item get_split_file()
264:
265: =item are_different_files()
266:
267: =item handler()
268:
269: =cut
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