1: # The LearningOnline Network with CAPA
2: # Handler to show differences between file versions
3: #
4: # $Id: londiff.pm,v 1.32 2011/10/30 14:59:57 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,$cstrdom) =
104: &Apache::loncacc::constructaccess("/priv/$cudom/$cuname".$env{'form.filename'});
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: if ($cuname ne '' && $cudom ne '') {
114: $allowed = 1;
115: } else {
116: $r->log_reason($env{'user.name'}.':'.$env{'user.domain'}.
117: ' trying to get diffs file '.$env{'form.filename'}.
118: ' - not authorized',
119: $r->filename);
120: }
121: }
122: unless ($allowed) {
123: return HTTP_NOT_ACCEPTABLE;
124: }
125:
126: # Get the files
127:
128: my $efn=$env{'form.filename'};
129: $efn=~s{^/priv/$LONCAPA::domain_re/$LONCAPA::username_re}{};
130:
131: my @f1=();
132: my @f2=();
133:
134: &Apache::loncommon::content_type($r,'text/html');
135: $r->send_http_header;
136:
137: $r->print(&Apache::loncommon::start_page('Resource Differences',undef,
138: {'no_nav_bar' => 1, }));
139:
140: $r->print(($env{'form.filetwo'}?'':&mt('Compare versions of')).
141: ' <span class="LC_filename">'.$efn.'</span>');
142:
143: if (($cuname ne $env{'user.name'}) || ($cudom ne $env{'user.domain'})) {
144: $r->print('<p><span class="LC_info">'
145: .&mt('Co-Author [_1]'
146: ,&Apache::loncommon::plainname($cuname,$cudom)
147: .' ('.$cuname.':'.$cudom.')')
148: .'</span></p>'
149: );
150: }
151:
152:
153: if (&Apache::loncommon::fileembstyle(($efn=~/\.(\w+)$/)) eq 'ssi'
154: || $efn =~ /\.meta$/) {
155: $r->print('<p><span class="LC_diff_removed">');
156: if ($env{'form.versionone'} eq 'priv') {
157: my $fn=$r->dir_config('lonDocRoot')."/priv/$cudom/$cuname".$efn;
158: @f1=&get_split_file($fn,'local');
159: $r->print('<b>'.&mt('Construction Space Version').'</b>');
160: } else {
161: my $fn=$r->dir_config('lonDocRoot')."/res/$cudom/$cuname";
162: if ($env{'form.versionone'}) {
163: my ($main,$suffix,$is_meta)=
164: &Apache::lonretrieve::get_file_info($efn);
165:
166: $fn.=($efn =~m|(.*/)[^/]+|)[0];
167: # add on to $fn the path information in $efn
168: $fn.=$main.'.'.$env{'form.versionone'}.'.'.$suffix;
169: $r->print('<b>'.&mt('Version').' '.$env{'form.versionone'}.'</b>');
170: } else {
171: $fn.=$efn;
172: $r->print('<b>'.&mt('Current Version').'</b>');
173: }
174: @f1=&get_split_file($fn,'remote');
175: }
176:
177: $r->print('</span><br />'.&mt('versus').'<br /><span class="LC_diff_added">');
178:
179: if ($env{'form.filetwo'}) {
180: my $efn2=$env{'form.filetwo'};
181: $efn2=~s{^/priv/$LONCAPA::domain_re/$LONCAPA::username_re}{};
182: my $fn=$r->dir_config('lonDocRoot')."/priv/$cudom/$cuname".$efn2;
183: @f2=&get_split_file($fn,'local');
184: $r->print('<tt>'.$efn2.'</tt>');
185: } elsif ($env{'form.versiontwo'} eq 'priv') {
186: my $fn=$r->dir_config('lonDocRoot')."/priv/$cudom/$cuname".$efn;
187: @f2=&get_split_file($fn,'local');
188: $r->print('<b>'.&mt('Construction Space Version').'</b>');
189: } else {
190: my $fn=
191: '/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
192: if ($env{'form.versiontwo'}) {
193: my ($main,$suffix,$is_meta)=
194: &Apache::lonretrieve::get_file_info($efn);
195: # add on to $fn the path information in $efn
196: $fn.=($efn =~m|(.*/)[^/]+|)[0];
197: $fn.=$main.'.'.$env{'form.versiontwo'}.'.'.$suffix;
198: $r->print('<b>'.&mt('Version').' '.$env{'form.versiontwo'}.'</b>');
199: } else {
200: $fn.=$efn;
201: $r->print('<b>'.&mt('Current Version').'</b>');
202: }
203: @f2=&get_split_file($fn,'remote');
204: }
205: $r->print('</span></p>');
206: # Run diff
207:
208: my $diffs = diff(\@f1, \@f2);
209:
210: if (@$diffs) {
211: # Start page output
212: my $chunk;
213: my $line;
214: $r->print('<pre>');
215: foreach $chunk (@$diffs) {
216: foreach $line (@$chunk) {
217: my ($sign, $lineno, $text) = @$line;
218: $text=&HTML::Entities::encode($text,'<>&"');
219: $lineno=substr($lineno.' ',0,7);
220: $r->print('<span class="'.(($sign eq '+')?'LC_diff_added'
221: :'LC_diff_removed').'">'.
222: $sign.' '.$lineno.' '.$text."</span>\n");
223: }
224: $r->print("</pre><hr /><pre>\n");
225: }
226: $r->print('</pre>');
227: } else {
228: $r->print('<p class="LC_info">'.&mt('No differences found').'</p>');
229: }
230: } else {
231: $r->print('<h1><span class="LC_warning">'.&mt('Binary File').'</span></h1>');
232: }
233: $r->print('<center><a href="javascript:window.close();">'.&mt('Close This Window').'</a></center>');
234: $r->print(&Apache::loncommon::end_page());
235: return OK;
236: }
237:
238:
239: 1;
240: __END__
241:
242:
243: =pod
244:
245: =head1 NAME
246:
247: Apache::londiff
248:
249: =head1 SYNOPSIS
250:
251: Handler to show difference between two files.
252:
253: This is part of the LearningOnline Network with CAPA project
254: described at http://www.lon-capa.org.
255:
256: =head1 Subroutines
257:
258: =over
259:
260: =item get_split_file()
261:
262: =item are_different_files()
263:
264: =item handler()
265:
266: =cut
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