1 # This module is part of debbugs, and is released
2 # under the terms of the GPL version 2, or any later version. See the
3 # file README and COPYING for more information.
4 # Copyright 2013 by Don Armstrong <don@donarmstrong.com>.
6 package Debbugs::Libravatar;
10 Debbugs::Libravatar -- Libravatar service handler (mod_perl)
14 <Location /libravatar>
15 SetHandler perl-script
16 PerlResponseHandler Debbugs::Libravatar
21 Debbugs::Libravatar is a libravatar service handler which will serve
22 libravatar requests. It also contains utility routines which are used
23 by the libravatar.cgi script for those who do not have mod_perl.
33 use vars qw($VERSION $DEBUG %EXPORT_TAGS @EXPORT_OK @EXPORT);
34 use Exporter qw(import);
36 use Debbugs::Config qw(:config);
37 use Debbugs::Common qw(:lock);
40 use Debbugs::CGI qw(cgi_parameters);
41 use Digest::MD5 qw(md5_hex);
42 use File::Temp qw(tempfile);
49 ($VERSION) = q$Revision$ =~ /^Revision:\s+([^\s+])/;
50 $DEBUG = 0 unless defined $DEBUG;
53 %EXPORT_TAGS = (libravatar => [qw(cache_valid retrieve_libravatar cache_location)]
56 Exporter::export_ok_tags(keys %EXPORT_TAGS);
57 $EXPORT_TAGS{all} = [@EXPORT_OK];
61 my ($cache_location) = @_;
62 if (-e $cache_location) {
63 if (time - (stat($cache_location))[9] < 60*60) {
72 =item retrieve_libravatar
74 $cache_location = retrieve_libravatar(location => $cache_location,
75 email => lc($param{email}),
78 Returns the cache location where a specific avatar can be loaded. If
79 there isn't a matching avatar, or there is an error, returns undef.
84 sub retrieve_libravatar{
95 my $cache_location = $param{location};
96 $cache_location =~ s/\.[^\.\/]+$//;
97 # take out a lock on the cache location so that if another request
98 # is made while we are serving this one, we don't do double work
99 my ($fh,$lockfile,$errors) =
100 simple_filelock($cache_location.'.lock',20,0.5);
104 # figure out if the cache is now valid; if it is, return the
106 my $temp_location = cache_location(email => $param{email});
107 if (cache_valid($temp_location)) {
108 return $temp_location;
111 require LWP::UserAgent;
115 my $uri = libravatar_url(email => $param{email},
118 my $ua = LWP::UserAgent->new(agent => 'Debbugs libravatar service (not Mozilla)',
120 $ua->from($config{maintainer});
121 # if we don't get an avatar within 10 seconds, return so we
122 # don't block forever
124 # if the avatar is bigger than 30K, we don't want it either
125 $ua->max_size(30*1024);
126 my $r = $ua->get($uri);
127 if (not $r->is_success()) {
128 die "Not successful in request";
130 my $aborted = $r->header('Client-Aborted');
131 # if we exceeded max size, I'm not sure if we'll be
132 # successfull or not, but regardless, there will be a
133 # Client-Aborted header. Stop here if that header is defined.
134 die "Client aborted header" if defined $aborted;
135 my $type = $r->header('Content-Type');
136 # if there's no content type, or it's not one we like, we won't
137 # bother going further
138 die "No content type" if not defined $type;
139 die "Wrong content type" if not $type =~ m{^image/([^/]+)$};
140 $dest_type = $type_mapping{$1};
141 die "No dest type" if not defined $dest_type;
142 # undo any content encoding
143 $r->decode() or die "Unable to decode content encoding";
144 # ok, now we need to convert it from whatever it is into a
145 # format that we actually like
146 my ($temp_fh,$temp_fn) = tempfile() or
147 die "Unable to create temporary file";
149 print {$temp_fh} $r->content() or
150 die "Unable to print to temp file";
152 ### resize all images to 80x80 and strip comments out of
153 ### them. If convert has a bug, it would be possible for
154 ### this to be an attack vector, but hopefully minimizing
155 ### the size above, and requiring proper mime types will
156 ### minimize that slightly. Doing this will at least make
157 ### it harder for malicious web images to harm our users
158 system('convert','-resize','80x80',
161 $cache_location.'.'.$dest_type) == 0 or
162 die "convert file failed";
166 unlink($cache_location.'.'.$dest_type) if -e $cache_location.'.'.$dest_type;
167 unlink($temp_fn) if -e $temp_fn;
168 die "Unable to convert image";
172 # there was some kind of error; return undef and unlock the
174 simple_unlockfile($fh,$lockfile);
177 simple_unlockfile($fh,$lockfile);
178 return $cache_location.'.'.$dest_type;
181 sub blocked_libravatar {
182 my ($email,$md5sum) = @_;
184 for my $blocker (@{$config{libravatar_blacklist}||[]}) {
185 for my $element ($email,$md5sum) {
186 next unless defined $element;
188 if ($element =~ /$blocker/) {
200 if (exists $param{md5sum}) {
201 $md5sum = $param{md5sum};
202 }elsif (exists $param{email}) {
203 $md5sum = md5_hex(lc($param{email}));
205 croak("cache_location must be called with one of md5sum or email");
207 return undef if blocked_libravatar($param{email},$md5sum);
208 for my $ext (qw(.png .jpg)) {
209 if (-e $config{libravatar_cache_dir}.'/'.$md5sum.$ext) {
210 return $config{libravatar_cache_dir}.'/'.$md5sum.$ext;
213 return $config{libravatar_cache_dir}.'/'.$md5sum;
216 ## the following is mod_perl specific
219 if (exists $ENV{MOD_PERL_API_VERSION}) {
220 if ($ENV{MOD_PERL_API_VERSION} == 2) {
221 require Apache2::RequestIO;
222 require Apache2::RequestRec;
223 require Apache2::RequestUtil;
224 require Apache2::Const;
227 APR::Const->import(-compile => qw(FINFO_NORM));
228 Apache2::Const->import(-compile => qw(OK DECLINED FORBIDDEN NOT_FOUND HTTP_NOT_MODIFIED));
230 die "Unsupported mod perl api; mod_perl 2.0.0 or later is required";
236 die "Calling handler only makes sense if this is running under mod_perl" unless exists $ENV{MOD_PERL_API_VERSION};
237 my $r = shift or Apache2::RequestUtil->request;
239 # we only want GET or HEAD requests
240 unless ($r->method eq 'HEAD' or $r->method eq 'GET') {
241 return Apache2::Const::DECLINED();
243 $r->headers_out->{"X-Powered-By"} = "Debbugs libravatar";
246 # subtract out location
247 my $location = $r->location();
248 my ($email) = $uri =~ m/\Q$location\E\/?(.*)$/;
249 if (not length $email) {
250 return Apache2::Const::NOT_FOUND();
252 my $q = CGI::Simple->new();
253 my %param = cgi_parameters(query => $q,
254 single => [qw(avatar)],
255 default => {avatar => 'yes',
258 if ($param{avatar} ne 'yes' or not defined $email or not length $email) {
259 serve_cache_mod_perl('',$r);
260 return Apache2::Const::DECLINED();
262 # figure out what the md5sum of the e-mail is.
263 my $cache_location = cache_location(email => $email);
264 # if we've got it, and it's less than one hour old, return it.
265 if (cache_valid($cache_location)) {
266 serve_cache_mod_perl($cache_location,$r);
267 return Apache2::Const::DECLINED();
269 $cache_location = retrieve_libravatar(location => $cache_location,
272 if (not defined $cache_location) {
273 # failure, serve the default image
274 serve_cache_mod_perl('',$r);
275 return Apache2::Const::DECLINED();
277 serve_cache_mod_perl($cache_location,$r);
278 return Apache2::Const::DECLINED();
286 sub serve_cache_mod_perl {
287 my ($cache_location,$r) = @_;
288 if (not defined $cache_location or not length $cache_location) {
289 # serve the default image
290 $cache_location = $config{libravatar_default_image};
292 $magic = File::LibMagic->new() if not defined $magic;
294 return Apache2::Const::DECLINED() if not defined $magic;
296 $r->content_type($magic->checktype_filename(abs_path($cache_location)));
298 $r->filename($cache_location);
300 $r->finfo(APR::Finfo::stat($cache_location, APR::Const::FINFO_NORM(), $r->pool));