1: # The LearningOnline Network with CAPA
2: # Handler to show differences between file versions
3: #
4: # $Id: londiff.pm,v 1.6 2001/12/04 15:34:57 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: # (Handler to retrieve an old version of a file
30: #
31: # (Publication Handler
32: #
33: # (TeX Content Handler
34: #
35: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
36: #
37: # 11/28,11/29,11/30,12/01,12/02,12/04,12/23 Gerd Kortemeyer
38: # 03/23 Guy Albertelli
39: # 03/24,03/29 Gerd Kortemeyer)
40: #
41: # 03/31,04/03 Gerd Kortemeyer)
42: #
43: # 05/02/01,05/09 Gerd Kortemeyer
44:
45: package Apache::londiff;
46:
47: use strict;
48: use Apache::File;
49: use File::Copy;
50: use Algorithm::Diff qw(diff);
51: use Apache::Constants qw(:common :http :methods);
52: use Apache::loncacc;
53:
54: sub handler {
55:
56: my $r=shift;
57:
58: # Get query string for limited number of parameters
59:
60: map {
61: my ($name, $value) = split(/=/,$_);
62: $value =~ tr/+/ /;
63: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
64: if (($name eq 'filename') || ($name eq 'versiontwo') ||
65: ($name eq 'versionone')) {
66: unless ($ENV{'form.'.$name}) {
67: $ENV{'form.'.$name}=$value;
68: }
69: }
70: } (split(/&/,$ENV{'QUERY_STRING'}));
71:
72: # Get the files
73:
74: my $cuname=$ENV{'user.name'};
75: my $cudom=$ENV{'user.domain'};
76:
77: unless (($cuname,$cudom)=
78: &Apache::loncacc::constructaccess($ENV{'form.filename'},
79: $r->dir_config('lonDefDomain'))) {
80: $r->log_reason($cuname.' at '.$cudom.
81: ' trying to get diffs file '.$ENV{'form.filename'}.
82: ' - not authorized',
83: $r->filename);
84: return HTTP_NOT_ACCEPTABLE;
85: }
86:
87: my $efn=$ENV{'form.filename'};
88:
89: $efn=~s/\/\~(\w+)//g;
90:
91: my @f1=();
92: my @f2=();
93:
94: $r->content_type('text/html');
95: $r->send_http_header;
96:
97: $r->print('<html><head><title>LON-CAPA Construction Diffs</title></head>');
98:
99: $r->print('<body bgcolor="#FFFFFF">');
100:
101:
102: $r->print('<h1>Compare versions of <tt>'.$efn.'</tt></h1>');
103:
104: if (($cuname ne $ENV{'user.name'}) || ($cudom ne $ENV{'user.domain'})) {
105: $r->print('<h3><font color=red>Co-Author: '.$cuname.' at '.$cudom.
106: '</font></h3>');
107: }
108:
109:
110: if (&Apache::lonnet::fileembstyle(($efn=~/\.(\w+)$/)) eq
111: 'ssi') {
112: if ($ENV{'form.versionone'} eq 'priv') {
113: my $fn='/home/'.$cuname.'/public_html/'.$efn;
114: if (-e $fn) {
115: my $fh=Apache::File->new($fn);
116: my $line;
117: while($line=<$fh>) {
118: chomp($line);
119: $f1[$#f1+1]=$line;
120: }
121: }
122: $r->print('<h3>Construction Space Version</h3>');
123: } else {
124: my $fn=
125: '/home/httpd/html//res/'.$cudom.'/'.$cuname.'/';
126: if ($ENV{'form.versionone'}) {
127: my ($main,$suffix)=($efn=~/^(.+)\.(\w+)$/);
128: $fn.=$main.'.'.$ENV{'form.versionone'}.'.'.$suffix;
129: $r->print('<h3>Version '.$ENV{'form.versionone'}.'</h3>');
130: } else {
131: $fn.=$efn;
132: $r->print('<h3>Current Version</h3>');
133: }
134: @f1=split(/\n/,&Apache::lonnet::getfile($fn));
135: }
136:
137: $r->print('versus');
138:
139: if ($ENV{'form.versiontwo'} eq 'priv') {
140: my $fn='/home/'.$cuname.'/public_html/'.$efn;
141: if (-e $fn) {
142: my $fh=Apache::File->new($fn);
143: my $line;
144: while($line=<$fh>) {
145: chomp($line);
146: $f2[$#f2+1]=$line;
147: }
148: }
149: $r->print('<h3>Construction Space Version</h3>');
150: } else {
151: my $fn=
152: '/home/httpd/html/res/'.$cudom.'/'.$cuname.'/';
153: if ($ENV{'form.versiontwo'}) {
154: my ($main,$suffix)=($efn=~/^(.+)\.(\w+)$/);
155: $fn.=$main.'.'.$ENV{'form.versiontwo'}.'.'.$suffix;
156: $r->print('<h3>Version '.$ENV{'form.versiontwo'}.'</h3>');
157: } else {
158: $fn.=$efn;
159: $r->print('<h3>Current Version</h3>');
160: }
161: @f2=split(/\n/,&Apache::lonnet::getfile($fn));
162: }
163:
164: # Run diff
165:
166: my $diffs = diff(\@f1, \@f2);
167:
168: # Start page output
169:
170: my $chunk;
171: my $line;
172:
173: $r->print('<pre>');
174:
175: foreach $chunk (@$diffs) {
176:
177: foreach $line (@$chunk) {
178: my ($sign, $lineno, $text) = @$line;
179: $text=~s/\</\<\;/g;
180: $text=~s/\>/\>\;/g;
181: $lineno=substr($lineno.' ',0,7);
182: $r->print('<font color='.(($sign eq '+')?'green':'red').'>'.
183: $sign.' '.$lineno.' '.$text."</font>\n");
184: }
185: $r->print("<hr>\n");
186: }
187: $r->print('</pre>');
188:
189: } else {
190: $r->print('<h1><font color=red>Binary File</font></h1>');
191: }
192: $r->print('</body></html>');
193: return OK;
194: }
195:
196:
197: 1;
198: __END__
199:
200:
201:
202:
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