inline: Avoid using %links to test for page existence
[ikiwiki.git] / IkiWiki / Receive.pm
1 #!/usr/bin/perl
2 package IkiWiki::Receive;
3
4 use warnings;
5 use strict;
6 use IkiWiki;
7
8 sub getuser () {
9         my $user=(getpwuid(exists $ENV{CALLER_UID} ? $ENV{CALLER_UID} : $<))[0];
10         if (! defined $user) {
11                 error("cannot determine username for $<");
12         }
13         return $user;
14 }
15
16 sub trusted () {
17         my $user=getuser();
18         return ! ref $config{untrusted_committers} ||
19                 ! grep { $_ eq $user } @{$config{untrusted_committers}};
20 }
21
22 sub genwrapper () {
23         # Test for commits from untrusted committers in the wrapper, to
24         # avoid starting ikiwiki proper at all for trusted commits.
25
26         my $ret=<<"EOF";
27         {
28                 int u=getuid();
29 EOF
30         $ret.="\t\tif ( ".
31                 join("&&", map {
32                         my $uid=getpwnam($_);
33                         if (! defined $uid) {
34                                 error(sprintf(gettext("cannot determine id of untrusted committer %s"), $_));
35                         }
36                         "u != $uid";
37                 } @{$config{untrusted_committers}}).
38                 ") exit(0);\n";
39
40         
41         $ret.=<<"EOF";
42                 asprintf(&s, "CALLER_UID=%i", u);
43                 newenviron[i++]=s;
44         }
45 EOF
46         return $ret;
47 }
48
49 sub test () {
50         exit 0 if trusted();
51         
52         IkiWiki::lockwiki();
53         IkiWiki::loadindex();
54         
55         # Dummy up a cgi environment to use when calling check_canedit
56         # and friends.
57         eval q{use CGI};
58         error($@) if $@;
59         my $cgi=CGI->new;
60         $ENV{REMOTE_ADDR}='unknown' unless exists $ENV{REMOTE_ADDR};
61
62         # And dummy up a session object.
63         require IkiWiki::CGI;
64         my $session=IkiWiki::cgi_getsession($cgi);
65         $session->param("name", getuser());
66         # Make sure whatever user was authed is in the
67         # userinfo db.
68         require IkiWiki::UserInfo;
69         if (! IkiWiki::userinfo_get($session->param("name"), "regdate")) {
70                 IkiWiki::userinfo_setall($session->param("name"), {
71                         email => "",
72                         password => "",
73                         regdate => time,
74                 }) || error("failed adding user");
75         }
76         
77         my %newfiles;
78
79         foreach my $change (IkiWiki::rcs_receive()) {
80                 # This untaint is safe because we check file_pruned and
81                 # wiki_file_regexp.
82                 my ($file)=$change->{file}=~/$config{wiki_file_regexp}/;
83                 $file=IkiWiki::possibly_foolish_untaint($file);
84                 if (! defined $file || ! length $file ||
85                     IkiWiki::file_pruned($file, $config{srcdir})) {
86                         error(gettext("bad file name %s"), $file);
87                 }
88
89                 my $type=pagetype($file);
90                 my $page=pagename($file) if defined $type;
91                 
92                 if ($change->{action} eq 'add') {
93                         $newfiles{$file}=1;
94                 }
95
96                 if ($change->{action} eq 'change' ||
97                     $change->{action} eq 'add') {
98                         if (defined $page) {
99                                 if (IkiWiki->can("check_canedit")) {
100                                         IkiWiki::check_canedit($page, $cgi, $session);
101                                         next;
102                                 }
103                         }
104                         else {
105                                 if (IkiWiki::Plugin::attachment->can("check_canattach")) {
106                                         IkiWiki::Plugin::attachment::check_canattach($session, $file, $change->{path});
107                                         next;
108                                 }
109                         }
110                 }
111                 elsif ($change->{action} eq 'remove') {
112                         # check_canremove tests to see if the file is present
113                         # on disk. This will fail is a single commit adds a
114                         # file and then removes it again. Avoid the problem
115                         # by not testing the removal in such pairs of changes.
116                         # (The add is still tested, just to make sure that
117                         # no data is added to the repo that a web edit
118                         # could not add.)
119                         next if $newfiles{$file};
120
121                         if (IkiWiki::Plugin::remove->can("check_canremove")) {
122                                 IkiWiki::Plugin::remove::check_canremove(defined $page ? $page : $file, $cgi, $session);
123                                 next;
124                         }
125                 }
126                 else {
127                         error "unknown action ".$change->{action};
128                 }
129                 
130                 error sprintf(gettext("you are not allowed to change %s"), $file);
131         }
132
133         exit 0;
134 }
135
136 1