1: # The LearningOnline Network with CAPA
2: # Handler to show differences between file versions
3: #
4: # $Id: londiff.pm,v 1.22 2006/12/05 02:55:55 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: package Apache::londiff;
31:
32: use strict;
33: use Apache::File;
34: use File::Copy;
35: use File::Compare;
36: use Algorithm::Diff qw(diff);
37: use Apache::Constants qw(:common :http :methods);
38: use Apache::loncacc();
39: use Apache::lonnet;
40: use Apache::loncommon();
41: use Apache::lonretrieve();
42: use Apache::lonlocal;
43: use LONCAPA();
44:
45: sub get_split_file {
46: my ($fn,$style)=@_;
47: my $f1;
48: my @f1;
49: if ($style eq 'local') {
50: if (-e $fn) {
51: my $fh=Apache::File->new($fn);
52: my $line;
53: while($line=<$fh>) {
54: $f1.=$line;
55: }
56: }
57: } elsif ($style eq 'remote') {
58: my $f1=&Apache::lonnet::getfile($fn);
59: }
60: if ($f1=~/\r/) {
61: @f1=split(/\r/,&Apache::lonnet::getfile($fn));
62: foreach my $line (@f1) {
63: $line=~s/\n//g;
64: }
65: } else {
66: @f1=split(/\n/,&Apache::lonnet::getfile($fn));
67: }
68: return @f1;
69: }
70:
71: sub are_different_files {
72: my ($fileone,$filetwo)=@_;
73: return &compare($fileone,$filetwo);
74: }
75:
76: sub handler {
77:
78: my $r=shift;
79: # Get query string for limited number of parameters
80:
81: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
82: ['filename','versiontwo',
83: 'versionone','filetwo']);
84: # Get the files
85:
86: my $cuname=$env{'user.name'};
87: my $cudom=$env{'user.domain'};
88:
89: if ($env{'form.filename'}=~/^\/res\//) {
90: ($cudom,$cuname,$env{'form.filename'})=
91: ($env{'form.filename'}=~m{^/res/($LONCAPA::domain_re)/($LONCAPA::username_re)/(.*)$});
92: } else {
93: unless (($cuname,$cudom)=
94: &Apache::loncacc::constructaccess($env{'form.filename'},
95: $r->dir_config('lonDefDomain'))) {
96: $r->log_reason($cuname.':'.$cudom.
97: ' trying to get diffs file '.$env{'form.filename'}.
98: ' - not authorized',
99: $r->filename);
100: return HTTP_NOT_ACCEPTABLE;
101: }
102: }
103:
104: my $efn=$env{'form.filename'};
105:
106: $efn=~s{/\~($LONCAPA::username_re)}{}g;
107:
108: my @f1=();
109: my @f2=();
110:
111: &Apache::loncommon::content_type($r,'text/html');
112: $r->send_http_header;
113:
114: $r->print(&Apache::loncommon::start_page('Resource Differences'));
115:
116:
117: $r->print('<h1>'.($env{'form.filetwo'}?'':&mt('Compare versions of')).
118: ' <tt>'.$efn.'</tt></h1>');
119:
120: if (($cuname ne $env{'user.name'}) || ($cudom ne $env{'user.domain'})) {
121: $r->print('<h3><span class="LC_diff_coauthor">Co-Author: '.$cuname.' at '.$cudom.
122: '</span></h3>');
123: }
124:
125:
126: if (&Apache::loncommon::fileembstyle(($efn=~/\.(\w+)$/)) eq 'ssi'
127: || $efn =~ /\.meta$/) {
128: $r->print('<p><span class="LC_diff_removed">');
129: if ($env{'form.versionone'} eq 'priv') {
130: my $fn='/home/'.$cuname.'/public_html/'.$efn;
131: @f1=&get_split_file($fn,'local');
132: $r->print('<b>'.&mt('Construction Space Version').'</b>');
133: } else {
134: my $fn=
135: '/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
136: if ($env{'form.versionone'}) {
137: my ($main,$suffix,$is_meta)=
138: &Apache::lonretrieve::get_file_info($efn);
139:
140: $fn.=($efn =~m|(.*/)[^/]+|)[0];
141: # add on to $fn the path information in $efn
142: $fn.=$main.'.'.$env{'form.versionone'}.'.'.$suffix;
143: $r->print('<b>'.&mt('Version').' '.$env{'form.versionone'}.'</b>');
144: } else {
145: $fn.=$efn;
146: $r->print('<b>'.&mt('Current Version').'</b>');
147: }
148: @f1=&get_split_file($fn,'remote');
149: }
150:
151: $r->print('</span><br />'.&mt('versus').'<br /><span class="LC_diff_added">');
152:
153: if ($env{'form.filetwo'}) {
154: my $efn2=$env{'form.filetwo'};
155: $efn2=~s{/\~($LONCAPA::username_re)}{}g;
156: my $fn='/home/'.$cuname.'/public_html/'.$efn2;
157: @f2=&get_split_file($fn,'local');
158: $r->print('<tt>'.$efn2.'</tt>');
159: } elsif ($env{'form.versiontwo'} eq 'priv') {
160: my $fn='/home/'.$cuname.'/public_html/'.$efn;
161: @f2=&get_split_file($fn,'local');
162: $r->print('<b>'.&mt('Construction Space Version').'</b>');
163: } else {
164: my $fn=
165: '/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
166: if ($env{'form.versiontwo'}) {
167: my ($main,$suffix,$is_meta)=
168: &Apache::lonretrieve::get_file_info($efn);
169: # add on to $fn the path information in $efn
170: $fn.=($efn =~m|(.*/)[^/]+|)[0];
171: $fn.=$main.'.'.$env{'form.versiontwo'}.'.'.$suffix;
172: $r->print('<b>'.&mt('Version').' '.$env{'form.versiontwo'}.'</b>');
173: } else {
174: $fn.=$efn;
175: $r->print('<b>'.&mt('Current Version').'</b>');
176: }
177: @f2=&get_split_file($fn,'remote');
178: }
179: $r->print('</span></p>');
180: # Run diff
181:
182: my $diffs = diff(\@f1, \@f2);
183:
184: # Start page output
185:
186: my $chunk;
187: my $line;
188:
189: $r->print('<pre>');
190:
191: foreach $chunk (@$diffs) {
192:
193: foreach $line (@$chunk) {
194: my ($sign, $lineno, $text) = @$line;
195: $text=&HTML::Entities::encode($text,'<>&"');
196: $lineno=substr($lineno.' ',0,7);
197: $r->print('<span class="'.(($sign eq '+')?'LC_diff_added'
198: :'LC_diff_removed').'">'.
199: $sign.' '.$lineno.' '.$text."</span>\n");
200: }
201: $r->print("</pre><hr /><pre>\n");
202: }
203: $r->print('</pre>');
204:
205: } else {
206: $r->print('<h1><span class="LC_warning">'.&mt('Binary File').'</span></h1>');
207: }
208: $r->print('<center><a href="javascript:window.close();">'.&mt('Close This Window').'</a></center>');
209: $r->print(&Apache::loncommon::end_page());
210: return OK;
211: }
212:
213:
214: 1;
215: __END__
216:
217:
218:
219:
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