1: # The LearningOnline Network with CAPA
2: # Handler to show differences between file versions
3: #
4: # $Id: londiff.pm,v 1.31 2011/10/30 00:30:19 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 ($env{'form.filename'}=~/^\/res\//) {
87: if (&Apache::lonnet::allowed('bre',$env{'form.filename'})) {
88: if ($env{'request.course.id'}) {
89: if (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
90: $allowed = 1;
91: }
92: }
93: } elsif (&Apache::lonnet::allowed('bro',$env{'form.filename'})) {
94: $allowed = 1;
95: }
96: if ($allowed) {
97: ($cudom,$cuname,$env{'form.filename'})=
98: ($env{'form.filename'}=~m{^/res/($LONCAPA::domain_re)/($LONCAPA::username_re)(/.*)$});
99: }
100: } else {
101: ($cuname,$cudom)=
102: &Apache::loncacc::constructaccess($env{'form.filename'},
103: $r->dir_config('lonDefDomain'));
104: if ($cuname ne '' && $cudom ne '') {
105: $allowed = 1;
106: } else {
107: $r->log_reason($env{'user.name'}.':'.$env{'user.domain'}.
108: ' trying to get diffs file '.$env{'form.filename'}.
109: ' - not authorized',
110: $r->filename);
111: }
112: }
113: unless ($allowed) {
114: return HTTP_NOT_ACCEPTABLE;
115: }
116:
117: # Get the files
118:
119: my $efn=$env{'form.filename'};
120:
121: $efn=~s{^/priv/$LONCAPA::domain_re/$LONCAPA::username_re}{};
122:
123: my @f1=();
124: my @f2=();
125:
126: &Apache::loncommon::content_type($r,'text/html');
127: $r->send_http_header;
128:
129: $r->print(&Apache::loncommon::start_page('Resource Differences',undef,
130: {'no_nav_bar' => 1, }));
131:
132: $r->print(($env{'form.filetwo'}?'':&mt('Compare versions of')).
133: ' <span class="LC_filename">'.$efn.'</span>');
134:
135: if (($cuname ne $env{'user.name'}) || ($cudom ne $env{'user.domain'})) {
136: $r->print('<p><span class="LC_info">'
137: .&mt('Co-Author [_1]'
138: ,&Apache::loncommon::plainname($cuname,$cudom)
139: .' ('.$cuname.':'.$cudom.')')
140: .'</span></p>'
141: );
142: }
143:
144:
145: if (&Apache::loncommon::fileembstyle(($efn=~/\.(\w+)$/)) eq 'ssi'
146: || $efn =~ /\.meta$/) {
147: $r->print('<p><span class="LC_diff_removed">');
148: if ($env{'form.versionone'} eq 'priv') {
149: my $fn=$r->dir_config('lonDocRoot')."/priv/$cudom/$cuname".$efn;
150: @f1=&get_split_file($fn,'local');
151: $r->print('<b>'.&mt('Construction Space Version').'</b>');
152: } else {
153: my $fn=$r->dir_config('lonDocRoot')."/res/$cudom/$cuname";
154: if ($env{'form.versionone'}) {
155: my ($main,$suffix,$is_meta)=
156: &Apache::lonretrieve::get_file_info($efn);
157:
158: $fn.=($efn =~m|(.*/)[^/]+|)[0];
159: # add on to $fn the path information in $efn
160: $fn.=$main.'.'.$env{'form.versionone'}.'.'.$suffix;
161: $r->print('<b>'.&mt('Version').' '.$env{'form.versionone'}.'</b>');
162: } else {
163: $fn.=$efn;
164: $r->print('<b>'.&mt('Current Version').'</b>');
165: }
166: @f1=&get_split_file($fn,'remote');
167: }
168:
169: $r->print('</span><br />'.&mt('versus').'<br /><span class="LC_diff_added">');
170:
171: if ($env{'form.filetwo'}) {
172: my $efn2=$env{'form.filetwo'};
173: $efn2=~s{^/priv/$LONCAPA::domain_re/$LONCAPA::username_re}{};
174: my $fn=$r->dir_config('lonDocRoot')."/priv/$cudom/$cuname".$efn2;
175: @f2=&get_split_file($fn,'local');
176: $r->print('<tt>'.$efn2.'</tt>');
177: } elsif ($env{'form.versiontwo'} eq 'priv') {
178: my $fn=$r->dir_config('lonDocRoot')."/priv/$cudom/$cuname".$efn;
179: @f2=&get_split_file($fn,'local');
180: $r->print('<b>'.&mt('Construction Space Version').'</b>');
181: } else {
182: my $fn=
183: '/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
184: if ($env{'form.versiontwo'}) {
185: my ($main,$suffix,$is_meta)=
186: &Apache::lonretrieve::get_file_info($efn);
187: # add on to $fn the path information in $efn
188: $fn.=($efn =~m|(.*/)[^/]+|)[0];
189: $fn.=$main.'.'.$env{'form.versiontwo'}.'.'.$suffix;
190: $r->print('<b>'.&mt('Version').' '.$env{'form.versiontwo'}.'</b>');
191: } else {
192: $fn.=$efn;
193: $r->print('<b>'.&mt('Current Version').'</b>');
194: }
195: @f2=&get_split_file($fn,'remote');
196: }
197: $r->print('</span></p>');
198: # Run diff
199:
200: my $diffs = diff(\@f1, \@f2);
201:
202: if (@$diffs) {
203: # Start page output
204: my $chunk;
205: my $line;
206: $r->print('<pre>');
207: foreach $chunk (@$diffs) {
208: foreach $line (@$chunk) {
209: my ($sign, $lineno, $text) = @$line;
210: $text=&HTML::Entities::encode($text,'<>&"');
211: $lineno=substr($lineno.' ',0,7);
212: $r->print('<span class="'.(($sign eq '+')?'LC_diff_added'
213: :'LC_diff_removed').'">'.
214: $sign.' '.$lineno.' '.$text."</span>\n");
215: }
216: $r->print("</pre><hr /><pre>\n");
217: }
218: $r->print('</pre>');
219: } else {
220: $r->print('<p class="LC_info">'.&mt('No differences found').'</p>');
221: }
222: } else {
223: $r->print('<h1><span class="LC_warning">'.&mt('Binary File').'</span></h1>');
224: }
225: $r->print('<center><a href="javascript:window.close();">'.&mt('Close This Window').'</a></center>');
226: $r->print(&Apache::loncommon::end_page());
227: return OK;
228: }
229:
230:
231: 1;
232: __END__
233:
234:
235: =pod
236:
237: =head1 NAME
238:
239: Apache::londiff
240:
241: =head1 SYNOPSIS
242:
243: Handler to show difference between two files.
244:
245: This is part of the LearningOnline Network with CAPA project
246: described at http://www.lon-capa.org.
247:
248: =head1 Subroutines
249:
250: =over
251:
252: =item get_split_file()
253:
254: =item are_different_files()
255:
256: =item handler()
257:
258: =cut
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