IkiWiki/Plugin/aggregate.pm

   1 #!/usr/bin/perl
   2 # Blog aggregation plugin.
   3 package IkiWiki::Plugin::aggregate;
   4
   5 use warnings;
   6 use strict;
   7 use IkiWiki;
   8 use HTML::Entities;
   9 use HTML::Parser;
  10 use HTML::Tagset;
  11 use URI;
  12 use open qw{:utf8 :std};
  13
  14 my %feeds;
  15 my %guids;
  16
  17 sub import { #{{{
  18         hook(type => "getopt", id => "aggregate", call => \&getopt);
  19         hook(type => "checkconfig", id => "aggregate", call => \&checkconfig);
  20         hook(type => "filter", id => "aggregate", call => \&filter);
  21         hook(type => "preprocess", id => "aggregate", call => \&preprocess);
  22         hook(type => "delete", id => "aggregate", call => \&delete);
  23         hook(type => "savestate", id => "aggregate", call => \&savestate);
  24 } # }}}
  25
  26 sub getopt () { #{{{
  27         eval q{use Getopt::Long};
  28         error($@) if $@;
  29         Getopt::Long::Configure('pass_through');
  30         GetOptions("aggregate" => \$config{aggregate});
  31 } #}}}
  32
  33 sub checkconfig () { #{{{
  34         my $nolock=($config{post_commit} && ! IkiWiki::commit_hook_enabled());
  35         IkiWiki::lockwiki() unless $nolock;
  36         loadstate();
  37         if ($config{aggregate} && ! $nolock) {
  38                 IkiWiki::loadindex();
  39                 aggregate();
  40                 expire();
  41                 savestate();
  42         }
  43         IkiWiki::unlockwiki() unless $nolock;
  44 } #}}}
  45
  46 sub filter (@) { #{{{
  47         my %params=@_;
  48         my $page=$params{page};
  49
  50         # Mark all feeds originating on this page as removable;
  51         # preprocess will unmark those that still exist.
  52         remove_feeds($page);
  53
  54         return $params{content};
  55 } # }}}
  56
  57 sub preprocess (@) { #{{{
  58         my %params=@_;
  59
  60         foreach my $required (qw{name url}) {
  61                 if (! exists $params{$required}) {
  62                         return "[[aggregate ".sprintf(gettext("missing %s parameter"), $required)."]]";
  63                 }
  64         }
  65
  66         my $feed={};
  67         my $name=$params{name};
  68         if (exists $feeds{$name}) {
  69                 $feed=$feeds{$name};
  70         }
  71         else {
  72                 $feeds{$name}=$feed;
  73         }
  74         $feed->{name}=$name;
  75         $feed->{sourcepage}=$params{page};
  76         $feed->{url}=$params{url};
  77         my $dir=exists $params{dir} ? $params{dir} : $params{page}."/".IkiWiki::titlepage($params{name});
  78         $dir=~s/^\/+//;
  79         ($dir)=$dir=~/$config{wiki_file_regexp}/;
  80         $feed->{dir}=$dir;
  81         $feed->{feedurl}=defined $params{feedurl} ? $params{feedurl} : "";
  82         $feed->{updateinterval}=defined $params{updateinterval} ? $params{updateinterval} * 60 : 15 * 60;
  83         $feed->{expireage}=defined $params{expireage} ? $params{expireage} : 0;
  84         $feed->{expirecount}=defined $params{expirecount} ? $params{expirecount} : 0;
  85         delete $feed->{remove};
  86         delete $feed->{expired};
  87         $feed->{lastupdate}=0 unless defined $feed->{lastupdate};
  88         $feed->{numposts}=0 unless defined $feed->{numposts};
  89         $feed->{newposts}=0 unless defined $feed->{newposts};
  90         $feed->{message}=gettext("new feed") unless defined $feed->{message};
  91         $feed->{error}=0 unless defined $feed->{error};
  92         $feed->{tags}=[];
  93         while (@_) {
  94                 my $key=shift;
  95                 my $value=shift;
  96                 if ($key eq 'tag') {
  97                         push @{$feed->{tags}}, $value;
  98                 }
  99         }
 100
 101         return "<a href=\"".$feed->{url}."\">".$feed->{name}."</a>: ".
 102                ($feed->{error} ? "<em>" : "").$feed->{message}.
 103                ($feed->{error} ? "</em>" : "").
 104                " (".$feed->{numposts}." ".gettext("posts").
 105                ($feed->{newposts} ? "; ".$feed->{newposts}.
 106                                     " ".gettext("new") : "").
 107                ")";
 108 } # }}}
 109
 110 sub delete (@) { #{{{
 111         my @files=@_;
 112
 113         # Remove feed data for removed pages.
 114         foreach my $file (@files) {
 115                 my $page=pagename($file);
 116                 remove_feeds($page);
 117         }
 118 } #}}}
 119
 120 sub loadstate () { #{{{
 121         if (-e "$config{wikistatedir}/aggregate") {
 122                 open (IN, "$config{wikistatedir}/aggregate" ||
 123                         die "$config{wikistatedir}/aggregate: $!");
 124                 while (<IN>) {
 125                         $_=IkiWiki::possibly_foolish_untaint($_);
 126                         chomp;
 127                         my $data={};
 128                         foreach my $i (split(/ /, $_)) {
 129                                 my ($field, $val)=split(/=/, $i, 2);
 130                                 if ($field eq "name" || $field eq "feed" ||
 131                                     $field eq "guid" || $field eq "message") {
 132                                         $data->{$field}=decode_entities($val, " \t\n");
 133                                 }
 134                                 elsif ($field eq "tag") {
 135                                         push @{$data->{tags}}, $val;
 136                                 }
 137                                 else {
 138                                         $data->{$field}=$val;
 139                                 }
 140                         }
 141
 142                         if (exists $data->{name}) {
 143                                 $feeds{$data->{name}}=$data;
 144                         }
 145                         elsif (exists $data->{guid}) {
 146                                 $guids{$data->{guid}}=$data;
 147                         }
 148                 }
 149
 150                 close IN;
 151         }
 152 } #}}}
 153
 154 sub savestate () { #{{{
 155         eval q{use HTML::Entities};
 156         error($@) if $@;
 157         my $newfile="$config{wikistatedir}/aggregate.new";
 158         # TODO: This cleanup function could use improvement. Any newly
 159         # aggregated files are left behind unrecorded, and should be deleted.
 160         my $cleanup = sub { unlink($newfile) };
 161         open (OUT, ">$newfile") || error("open $newfile: $!", $cleanup);
 162         foreach my $data (values %feeds, values %guids) {
 163                 if ($data->{remove}) {
 164                         if ($data->{name}) {
 165                                 foreach my $guid (values %guids) {
 166                                         if ($guid->{feed} eq $data->{name}) {
 167                                                 $guid->{remove}=1;
 168                                         }
 169                                 }
 170                         }
 171                         else {
 172                                 unlink pagefile($data->{page});
 173                         }
 174                         next;
 175                 }
 176                 elsif ($data->{expired} && exists $data->{page}) {
 177                         unlink pagefile($data->{page});
 178                         delete $data->{page};
 179                         delete $data->{md5};
 180                 }
 181
 182                 my @line;
 183                 foreach my $field (keys %$data) {
 184                         if ($field eq "name" || $field eq "feed" ||
 185                             $field eq "guid" || $field eq "message") {
 186                                 push @line, "$field=".encode_entities($data->{$field}, " \t\n");
 187                         }
 188                         elsif ($field eq "tags") {
 189                                 push @line, "tag=$_" foreach @{$data->{tags}};
 190                         }
 191                         else {
 192                                 push @line, "$field=".$data->{$field};
 193                         }
 194                 }
 195                 print OUT join(" ", @line)."\n" || error("write $newfile: $!", $cleanup);
 196         }
 197         close OUT || error("save $newfile: $!", $cleanup);
 198         rename($newfile, "$config{wikistatedir}/aggregate") ||
 199                 error("rename $newfile: $!", $cleanup);
 200 } #}}}
 201
 202 sub expire () { #{{{
 203         foreach my $feed (values %feeds) {
 204                 next unless $feed->{expireage} || $feed->{expirecount};
 205                 my $count=0;
 206                 foreach my $item (sort { $IkiWiki::pagectime{$b->{page}} <=> $IkiWiki::pagectime{$a->{page}} }
 207                                   grep { exists $_->{page} && $_->{feed} eq $feed->{name} && $IkiWiki::pagectime{$_->{page}} }
 208                                   values %guids) {
 209                         if ($feed->{expireage}) {
 210                                 my $days_old = (time - $IkiWiki::pagectime{$item->{page}}) / 60 / 60 / 24;
 211                                 if ($days_old > $feed->{expireage}) {
 212                                         debug(sprintf(gettext("expiring %s (%s days old)"),
 213                                                 $item->{page}, $days_old));
 214                                         $item->{expired}=1;
 215                                 }
 216                         }
 217                         elsif ($feed->{expirecount} &&
 218                                $count >= $feed->{expirecount}) {
 219                                 debug(sprintf(gettext("expiring %s"), $item->{page}));
 220                                 $item->{expired}=1;
 221                         }
 222                         else {
 223                                 $count++;
 224                         }
 225                 }
 226         }
 227 } #}}}
 228
 229 sub aggregate () { #{{{
 230         eval q{use XML::Feed};
 231         error($@) if $@;
 232         eval q{use HTML::Entities};
 233         error($@) if $@;
 234
 235         foreach my $feed (values %feeds) {
 236                 next unless $config{rebuild} ||
 237                         time - $feed->{lastupdate} >= $feed->{updateinterval};
 238                 $feed->{lastupdate}=time;
 239                 $feed->{newposts}=0;
 240                 $IkiWiki::forcerebuild{$feed->{sourcepage}}=1;
 241
 242                 debug(sprintf(gettext("checking feed %s ..."), $feed->{name}));
 243
 244                 if (! length $feed->{feedurl}) {
 245                         my @urls=XML::Feed->find_feeds($feed->{url});
 246                         if (! @urls) {
 247                                 $feed->{message}=sprintf(gettext("could not find feed at %s"), $feed->{feedurl});
 248                                 $feed->{error}=1;
 249                                 debug($feed->{message});
 250                                 next;
 251                         }
 252                         $feed->{feedurl}=pop @urls;
 253                 }
 254                 my $f=eval{XML::Feed->parse(URI->new($feed->{feedurl}))};
 255                 if ($@) {
 256                         $feed->{message}=gettext("feed crashed XML::Feed!")." ($@)";
 257                         $feed->{error}=1;
 258                         debug($feed->{message});
 259                         next;
 260                 }
 261                 if (! $f) {
 262                         $feed->{message}=XML::Feed->errstr;
 263                         $feed->{error}=1;
 264                         debug($feed->{message});
 265                         next;
 266                 }
 267
 268                 foreach my $entry ($f->entries) {
 269                         add_page(
 270                                 feed => $feed,
 271                                 title => defined $entry->title ? decode_entities($entry->title) : "untitled",
 272                                 link => $entry->link,
 273                                 content => $entry->content->body,
 274                                 guid => defined $entry->id ? $entry->id : time."_".$feed->name,
 275                                 ctime => $entry->issued ? ($entry->issued->epoch || time) : time,
 276                         );
 277                 }
 278
 279                 $feed->{message}=sprintf(gettext("processed ok at %s"),
 280                         displaytime($feed->{lastupdate}));
 281                 $feed->{error}=0;
 282         }
 283 } #}}}
 284
 285 sub add_page (@) { #{{{
 286         my %params=@_;
 287
 288         my $feed=$params{feed};
 289         my $guid={};
 290         my $mtime;
 291         if (exists $guids{$params{guid}}) {
 292                 # updating an existing post
 293                 $guid=$guids{$params{guid}};
 294                 return if $guid->{expired};
 295         }
 296         else {
 297                 # new post
 298                 $guid->{guid}=$params{guid};
 299                 $guids{$params{guid}}=$guid;
 300                 $mtime=$params{ctime};
 301                 $feed->{numposts}++;
 302                 $feed->{newposts}++;
 303
 304                 # assign it an unused page
 305                 my $page=IkiWiki::titlepage($params{title});
 306                 # escape slashes and periods in title so it doesn't specify
 307                 # directory name or trigger ".." disallowing code.
 308                 $page=~s!([/.])!"__".ord($1)."__"!eg;
 309                 $page=$feed->{dir}."/".$page;
 310                 ($page)=$page=~/$config{wiki_file_regexp}/;
 311                 if (! defined $page || ! length $page) {
 312                         $page=$feed->{dir}."/item";
 313                 }
 314                 my $c="";
 315                 while (exists $IkiWiki::pagecase{lc $page.$c} ||
 316                        -e pagefile($page.$c)) {
 317                         $c++
 318                 }
 319
 320                 # Make sure that the file name isn't too long.
 321                 # NB: This doesn't check for path length limits.
 322                 eval q{use POSIX};
 323                 my $max=POSIX::pathconf($config{srcdir}, &POSIX::_PC_NAME_MAX);
 324                 if (defined $max && length(htmlpage($page)) >= $max) {
 325                         $c="";
 326                         $page=$feed->{dir}."/item";
 327                         while (exists $IkiWiki::pagecase{lc $page.$c} ||
 328                                -e pagefile($page.$c)) {
 329                                 $c++
 330                         }
 331                 }
 332
 333                 $guid->{page}=$page;
 334                 debug(sprintf(gettext("creating new page %s"), $page));
 335         }
 336         $guid->{feed}=$feed->{name};
 337
 338         # To write or not to write? Need to avoid writing unchanged pages
 339         # to avoid unneccessary rebuilding. The mtime from rss cannot be
 340         # trusted; let's use a digest.
 341         eval q{use Digest::MD5 'md5_hex'};
 342         error($@) if $@;
 343         require Encode;
 344         my $digest=md5_hex(Encode::encode_utf8($params{content}));
 345         return unless ! exists $guid->{md5} || $guid->{md5} ne $digest || $config{rebuild};
 346         $guid->{md5}=$digest;
 347
 348         # Create the page.
 349         my $template=template("aggregatepost.tmpl", blind_cache => 1);
 350         $template->param(title => $params{title})
 351                 if defined $params{title} && length($params{title});
 352         $template->param(content => htmlescape(htmlabs($params{content}, $feed->{feedurl})));
 353         $template->param(name => $feed->{name});
 354         $template->param(url => $feed->{url});
 355         $template->param(permalink => urlabs($params{link}, $feed->{feedurl}))
 356                 if defined $params{link};
 357         if (ref $feed->{tags}) {
 358                 $template->param(tags => [map { tag => $_ }, @{$feed->{tags}}]);
 359         }
 360         writefile(htmlpage($guid->{page}), $config{srcdir},
 361                 $template->output);
 362
 363         # Set the mtime, this lets the build process get the right creation
 364         # time on record for the new page.
 365         utime $mtime, $mtime, pagefile($guid->{page}) if defined $mtime;
 366 } #}}}
 367
 368 sub htmlescape ($) { #{{{
 369         # escape accidental wikilinks and preprocessor stuff
 370         my $html=shift;
 371         $html=~s/(?<!\\)\[\[/\\\[\[/g;
 372         return $html;
 373 } #}}}
 374
 375 sub urlabs ($$) { #{{{
 376         my $url=shift;
 377         my $urlbase=shift;
 378
 379         URI->new_abs($url, $urlbase)->as_string;
 380 } #}}}
 381
 382 sub htmlabs ($$) { #{{{
 383         # Convert links in html from relative to absolute.
 384         # Note that this is a heuristic, which is not specified by the rss
 385         # spec and may not be right for all feeds. Also, see Debian
 386         # bug #381359.
 387         my $html=shift;
 388         my $urlbase=shift;
 389
 390         my $ret="";
 391         my $p = HTML::Parser->new(api_version => 3);
 392         $p->handler(default => sub { $ret.=join("", @_) }, "text");
 393         $p->handler(start => sub {
 394                 my ($tagname, $pos, $text) = @_;
 395                 if (ref $HTML::Tagset::linkElements{$tagname}) {
 396                         while (4 <= @$pos) {
 397                                 # use attribute sets from right to left
 398                                 # to avoid invalidating the offsets
 399                                 # when replacing the values
 400                                 my($k_offset, $k_len, $v_offset, $v_len) =
 401                                         splice(@$pos, -4);
 402                                 my $attrname = lc(substr($text, $k_offset, $k_len));
 403                                 next unless grep { $_ eq $attrname } @{$HTML::Tagset::linkElements{$tagname}};
 404                                 next unless $v_offset; # 0 v_offset means no value
 405                                 my $v = substr($text, $v_offset, $v_len);
 406                                 $v =~ s/^([\'\"])(.*)\1$/$2/;
 407                                 my $new_v=urlabs($v, $urlbase);
 408                                 $new_v =~ s/\"/&quot;/g; # since we quote with ""
 409                                 substr($text, $v_offset, $v_len) = qq("$new_v");
 410                         }
 411                 }
 412                 $ret.=$text;
 413         }, "tagname, tokenpos, text");
 414         $p->parse($html);
 415         $p->eof;
 416
 417         return $ret;
 418 } #}}}
 419
 420 sub remove_feeds () { #{{{
 421         my $page=shift;
 422
 423         my %removed;
 424         foreach my $id (keys %feeds) {
 425                 if ($feeds{$id}->{sourcepage} eq $page) {
 426                         $feeds{$id}->{remove}=1;
 427                         $removed{$id}=1;
 428                 }
 429         }
 430 } #}}}
 431
 432 sub pagefile ($) { #{{{
 433         my $page=shift;
 434
 435         return "$config{srcdir}/".htmlpage($page);
 436 } #}}}
 437
 438 1