IkiWiki/Plugin/aggregate.pm

   1 #!/usr/bin/perl
   2 # Feed aggregation plugin.
   3 package IkiWiki::Plugin::aggregate;
   4
   5 use warnings;
   6 use strict;
   7 use IkiWiki 3.00;
   8 use HTML::Parser;
   9 use HTML::Tagset;
  10 use HTML::Entities;
  11 use open qw{:utf8 :std};
  12
  13 my %feeds;
  14 my %guids;
  15
  16 sub import {
  17         hook(type => "getopt", id => "aggregate", call => \&getopt);
  18         hook(type => "getsetup", id => "aggregate", call => \&getsetup);
  19         hook(type => "checkconfig", id => "aggregate", call => \&checkconfig);
  20         hook(type => "needsbuild", id => "aggregate", call => \&needsbuild);
  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         hook(type => "htmlize", id => "_aggregated", call => \&htmlize);
  25         if (exists $config{aggregate_webtrigger} && $config{aggregate_webtrigger}) {
  26                 hook(type => "cgi", id => "aggregate", call => \&cgi);
  27         }
  28 }
  29
  30 sub getopt () {
  31         eval q{use Getopt::Long};
  32         error($@) if $@;
  33         Getopt::Long::Configure('pass_through');
  34         GetOptions(
  35                 "aggregate" => \$config{aggregate},
  36                 "aggregateinternal!" => \$config{aggregateinternal},
  37         );
  38 }
  39
  40 sub getsetup () {
  41         return
  42                 plugin => {
  43                         safe => 1,
  44                         rebuild => undef,
  45                 },
  46                 aggregateinternal => {
  47                         type => "boolean",
  48                         example => 1,
  49                         description => "enable aggregation to internal pages?",
  50                         safe => 0, # enabling needs manual transition
  51                         rebuild => 0,
  52                 },
  53                 aggregate_webtrigger => {
  54                         type => "boolean",
  55                         example => 0,
  56                         description => "allow aggregation to be triggered via the web?",
  57                         safe => 1,
  58                         rebuild => 0,
  59                 },
  60 }
  61
  62 sub checkconfig () {
  63         if (! defined $config{aggregateinternal}) {
  64                 $config{aggregateinternal}=1;
  65         }
  66
  67         if ($config{aggregate} && ! ($config{post_commit} &&
  68                                      IkiWiki::commit_hook_enabled())) {
  69                 launchaggregation();
  70         }
  71 }
  72
  73 sub cgi ($) {
  74         my $cgi=shift;
  75
  76         if (defined $cgi->param('do') &&
  77             $cgi->param("do") eq "aggregate_webtrigger") {
  78                 $|=1;
  79                 print "Content-Type: text/plain\n\n";
  80                 $config{cgi}=0;
  81                 $config{verbose}=1;
  82                 $config{syslog}=0;
  83                 print gettext("Aggregation triggered via web.")."\n\n";
  84                 if (launchaggregation()) {
  85                         IkiWiki::lockwiki();
  86                         IkiWiki::loadindex();
  87                         require IkiWiki::Render;
  88                         IkiWiki::refresh();
  89                         IkiWiki::saveindex();
  90                 }
  91                 else {
  92                         print gettext("Nothing to do right now, all feeds are up-to-date!")."\n";
  93                 }
  94                 exit 0;
  95         }
  96 }
  97
  98 sub launchaggregation () {
  99         # See if any feeds need aggregation.
 100         loadstate();
 101         my @feeds=needsaggregate();
 102         return unless @feeds;
 103         if (! lockaggregate()) {
 104                 debug("an aggregation process is already running");
 105                 return;
 106         }
 107         # force a later rebuild of source pages
 108         $IkiWiki::forcerebuild{$_->{sourcepage}}=1
 109                 foreach @feeds;
 110
 111         # Fork a child process to handle the aggregation.
 112         # The parent process will then handle building the
 113         # result. This avoids messy code to clear state
 114         # accumulated while aggregating.
 115         defined(my $pid = fork) or error("Can't fork: $!");
 116         if (! $pid) {
 117                 IkiWiki::loadindex();
 118                 # Aggregation happens without the main wiki lock
 119                 # being held. This allows editing pages etc while
 120                 # aggregation is running.
 121                 aggregate(@feeds);
 122
 123                 IkiWiki::lockwiki;
 124                 # Merge changes, since aggregation state may have
 125                 # changed on disk while the aggregation was happening.
 126                 mergestate();
 127                 expire();
 128                 savestate();
 129                 IkiWiki::unlockwiki;
 130                 exit 0;
 131         }
 132         waitpid($pid,0);
 133         if ($?) {
 134                 error "aggregation failed with code $?";
 135         }
 136
 137         clearstate();
 138         unlockaggregate();
 139
 140         return 1;
 141 }
 142
 143 #  Pages with extension _aggregated have plain html markup, pass through.
 144 sub htmlize (@) {
 145         my %params=@_;
 146         return $params{content};
 147 }
 148
 149 # Used by ikiwiki-transition aggregateinternal.
 150 sub migrate_to_internal {
 151         if (! lockaggregate()) {
 152                 error("an aggregation process is currently running");
 153         }
 154
 155         IkiWiki::lockwiki();
 156         loadstate();
 157         $config{verbose}=1;
 158
 159         foreach my $data (values %guids) {
 160                 next unless $data->{page};
 161                 next if $data->{expired};
 162
 163                 $config{aggregateinternal} = 0;
 164                 my $oldname = "$config{srcdir}/".htmlfn($data->{page});
 165                 if (! -e $oldname) {
 166                         $oldname = $IkiWiki::Plugin::transient::transientdir."/".htmlfn($data->{page});
 167                 }
 168
 169                 my $oldoutput = $config{destdir}."/".IkiWiki::htmlpage($data->{page});
 170
 171                 $config{aggregateinternal} = 1;
 172                 my $newname = $IkiWiki::Plugin::transient::transientdir."/".htmlfn($data->{page});
 173
 174                 debug "moving $oldname -> $newname";
 175                 if (-e $newname) {
 176                         if (-e $oldname) {
 177                                 error("$newname already exists");
 178                         }
 179                         else {
 180                                 debug("already renamed to $newname?");
 181                         }
 182                 }
 183                 elsif (-e $oldname) {
 184                         rename($oldname, $newname) || error("$!");
 185                 }
 186                 else {
 187                         debug("$oldname not found");
 188                 }
 189                 if (-e $oldoutput) {
 190                         require IkiWiki::Render;
 191                         debug("removing output file $oldoutput");
 192                         IkiWiki::prune($oldoutput);
 193                 }
 194         }
 195
 196         savestate();
 197         IkiWiki::unlockwiki;
 198
 199         unlockaggregate();
 200 }
 201
 202 sub needsbuild (@) {
 203         my $needsbuild=shift;
 204
 205         loadstate();
 206
 207         foreach my $feed (values %feeds) {
 208                 if (exists $pagesources{$feed->{sourcepage}} &&
 209                     grep { $_ eq $pagesources{$feed->{sourcepage}} } @$needsbuild) {
 210                         # Mark all feeds originating on this page as
 211                         # not yet seen; preprocess will unmark those that
 212                         # still exist.
 213                         markunseen($feed->{sourcepage});
 214                 }
 215         }
 216
 217         return $needsbuild;
 218 }
 219
 220 sub preprocess (@) {
 221         my %params=@_;
 222
 223         foreach my $required (qw{name url}) {
 224                 if (! exists $params{$required}) {
 225                         error sprintf(gettext("missing %s parameter"), $required)
 226                 }
 227         }
 228
 229         my $feed={};
 230         my $name=$params{name};
 231         if (exists $feeds{$name}) {
 232                 $feed=$feeds{$name};
 233         }
 234         else {
 235                 $feeds{$name}=$feed;
 236         }
 237         $feed->{name}=$name;
 238         $feed->{sourcepage}=$params{page};
 239         $feed->{url}=$params{url};
 240         my $dir=exists $params{dir} ? $params{dir} : $params{page}."/".titlepage($params{name});
 241         $dir=~s/^\/+//;
 242         ($dir)=$dir=~/$config{wiki_file_regexp}/;
 243         $feed->{dir}=$dir;
 244         $feed->{feedurl}=defined $params{feedurl} ? $params{feedurl} : "";
 245         $feed->{updateinterval}=defined $params{updateinterval} ? $params{updateinterval} * 60 : 15 * 60;
 246         $feed->{expireage}=defined $params{expireage} ? $params{expireage} : 0;
 247         $feed->{expirecount}=defined $params{expirecount} ? $params{expirecount} : 0;
 248         if (exists $params{template}) {
 249                 $params{template}=~s/[^-_a-zA-Z0-9]+//g;
 250         }
 251         else {
 252                 $params{template} = "aggregatepost"
 253         }
 254         $feed->{template}=$params{template} . ".tmpl";
 255         delete $feed->{unseen};
 256         $feed->{lastupdate}=0 unless defined $feed->{lastupdate};
 257         $feed->{lasttry}=$feed->{lastupdate} unless defined $feed->{lasttry};
 258         $feed->{numposts}=0 unless defined $feed->{numposts};
 259         $feed->{newposts}=0 unless defined $feed->{newposts};
 260         $feed->{message}=gettext("new feed") unless defined $feed->{message};
 261         $feed->{error}=0 unless defined $feed->{error};
 262         $feed->{tags}=[];
 263         while (@_) {
 264                 my $key=shift;
 265                 my $value=shift;
 266                 if ($key eq 'tag') {
 267                         push @{$feed->{tags}}, $value;
 268                 }
 269         }
 270
 271         return "<a href=\"".$feed->{url}."\">".$feed->{name}."</a>: ".
 272                ($feed->{error} ? "<em>" : "").$feed->{message}.
 273                ($feed->{error} ? "</em>" : "").
 274                " (".$feed->{numposts}." ".gettext("posts").
 275                ($feed->{newposts} ? "; ".$feed->{newposts}.
 276                                     " ".gettext("new") : "").
 277                ")";
 278 }
 279
 280 sub delete (@) {
 281         my @files=@_;
 282
 283         # Remove feed data for removed pages.
 284         foreach my $file (@files) {
 285                 my $page=pagename($file);
 286                 markunseen($page);
 287         }
 288 }
 289
 290 sub markunseen ($) {
 291         my $page=shift;
 292
 293         foreach my $id (keys %feeds) {
 294                 if ($feeds{$id}->{sourcepage} eq $page) {
 295                         $feeds{$id}->{unseen}=1;
 296                 }
 297         }
 298 }
 299
 300 my $state_loaded=0;
 301
 302 sub loadstate () {
 303         return if $state_loaded;
 304         $state_loaded=1;
 305         if (-e "$config{wikistatedir}/aggregate") {
 306                 open(IN, "<", "$config{wikistatedir}/aggregate") ||
 307                         die "$config{wikistatedir}/aggregate: $!";
 308                 while (<IN>) {
 309                         $_=IkiWiki::possibly_foolish_untaint($_);
 310                         chomp;
 311                         my $data={};
 312                         foreach my $i (split(/ /, $_)) {
 313                                 my ($field, $val)=split(/=/, $i, 2);
 314                                 if ($field eq "name" || $field eq "feed" ||
 315                                     $field eq "guid" || $field eq "message") {
 316                                         $data->{$field}=decode_entities($val, " \t\n");
 317                                 }
 318                                 elsif ($field eq "tag") {
 319                                         push @{$data->{tags}}, $val;
 320                                 }
 321                                 else {
 322                                         $data->{$field}=$val;
 323                                 }
 324                         }
 325
 326                         if (exists $data->{name}) {
 327                                 $feeds{$data->{name}}=$data;
 328                         }
 329                         elsif (exists $data->{guid}) {
 330                                 $guids{$data->{guid}}=$data;
 331                         }
 332                 }
 333
 334                 close IN;
 335         }
 336 }
 337
 338 sub savestate () {
 339         return unless $state_loaded;
 340         garbage_collect();
 341         my $newfile="$config{wikistatedir}/aggregate.new";
 342         my $cleanup = sub { unlink($newfile) };
 343         open (OUT, ">", $newfile) || error("open $newfile: $!", $cleanup);
 344         foreach my $data (values %feeds, values %guids) {
 345                 my @line;
 346                 foreach my $field (keys %$data) {
 347                         if ($field eq "name" || $field eq "feed" ||
 348                             $field eq "guid" || $field eq "message") {
 349                                 push @line, "$field=".encode_entities($data->{$field}, " \t\n");
 350                         }
 351                         elsif ($field eq "tags") {
 352                                 push @line, "tag=$_" foreach @{$data->{tags}};
 353                         }
 354                         else {
 355                                 push @line, "$field=".$data->{$field}
 356                                         if defined $data->{$field};
 357                         }
 358                 }
 359                 print OUT join(" ", @line)."\n" || error("write $newfile: $!", $cleanup);
 360         }
 361         close OUT || error("save $newfile: $!", $cleanup);
 362         rename($newfile, "$config{wikistatedir}/aggregate") ||
 363                 error("rename $newfile: $!", $cleanup);
 364
 365         my $timestamp=undef;
 366         foreach my $feed (keys %feeds) {
 367                 my $t=$feeds{$feed}->{lastupdate}+$feeds{$feed}->{updateinterval};
 368                 if (! defined $timestamp || $timestamp > $t) {
 369                         $timestamp=$t;
 370                 }
 371         }
 372         $newfile=~s/\.new$/time/;
 373         open (OUT, ">", $newfile) || error("open $newfile: $!", $cleanup);
 374         if (defined $timestamp) {
 375                 print OUT $timestamp."\n";
 376         }
 377         close OUT || error("save $newfile: $!", $cleanup);
 378 }
 379
 380 sub garbage_collect () {
 381         foreach my $name (keys %feeds) {
 382                 # remove any feeds that were not seen while building the pages
 383                 # that used to contain them
 384                 if ($feeds{$name}->{unseen}) {
 385                         delete $feeds{$name};
 386                 }
 387         }
 388
 389         foreach my $guid (values %guids) {
 390                 # any guid whose feed is gone should be removed
 391                 if (! exists $feeds{$guid->{feed}}) {
 392                         if (exists $guid->{page}) {
 393                                 unlink $IkiWiki::Plugin::transient::transientdir."/".htmlfn($guid->{page})
 394                                         || unlink "$config{srcdir}/".htmlfn($guid->{page});
 395                         }
 396                         delete $guids{$guid->{guid}};
 397                 }
 398                 # handle expired guids
 399                 elsif ($guid->{expired} && exists $guid->{page}) {
 400                         unlink "$config{srcdir}/".htmlfn($guid->{page});
 401                         unlink $IkiWiki::Plugin::transient::transientdir."/".htmlfn($guid->{page});
 402                         delete $guid->{page};
 403                         delete $guid->{md5};
 404                 }
 405         }
 406 }
 407
 408 sub mergestate () {
 409         # Load the current state in from disk, and merge into it
 410         # values from the state in memory that might have changed
 411         # during aggregation.
 412         my %myfeeds=%feeds;
 413         my %myguids=%guids;
 414         clearstate();
 415         loadstate();
 416
 417         # All that can change in feed state during aggregation is a few
 418         # fields.
 419         foreach my $name (keys %myfeeds) {
 420                 if (exists $feeds{$name}) {
 421                         foreach my $field (qw{message lastupdate lasttry
 422                                               numposts newposts error}) {
 423                                 $feeds{$name}->{$field}=$myfeeds{$name}->{$field};
 424                         }
 425                 }
 426         }
 427
 428         # New guids can be created during aggregation.
 429         # Guids have a few fields that may be updated during aggregation.
 430         # It's also possible that guids were removed from the on-disk state
 431         # while the aggregation was in process. That would only happen if
 432         # their feed was also removed, so any removed guids added back here
 433         # will be garbage collected later.
 434         foreach my $guid (keys %myguids) {
 435                 if (! exists $guids{$guid}) {
 436                         $guids{$guid}=$myguids{$guid};
 437                 }
 438                 else {
 439                         foreach my $field (qw{md5}) {
 440                                 $guids{$guid}->{$field}=$myguids{$guid}->{$field};
 441                         }
 442                 }
 443         }
 444 }
 445
 446 sub clearstate () {
 447         %feeds=();
 448         %guids=();
 449         $state_loaded=0;
 450 }
 451
 452 sub expire () {
 453         foreach my $feed (values %feeds) {
 454                 next unless $feed->{expireage} || $feed->{expirecount};
 455                 my $count=0;
 456                 my %seen;
 457                 foreach my $item (sort { ($IkiWiki::pagectime{$b->{page}} || 0) <=> ($IkiWiki::pagectime{$a->{page}} || 0) }
 458                                   grep { exists $_->{page} && $_->{feed} eq $feed->{name} }
 459                                   values %guids) {
 460                         if ($feed->{expireage}) {
 461                                 my $days_old = (time - ($IkiWiki::pagectime{$item->{page}} || 0)) / 60 / 60 / 24;
 462                                 if ($days_old > $feed->{expireage}) {
 463                                         debug(sprintf(gettext("expiring %s (%s days old)"),
 464                                                 $item->{page}, int($days_old)));
 465                                         $item->{expired}=1;
 466                                 }
 467                         }
 468                         elsif ($feed->{expirecount} &&
 469                                $count >= $feed->{expirecount}) {
 470                                 debug(sprintf(gettext("expiring %s"), $item->{page}));
 471                                 $item->{expired}=1;
 472                         }
 473                         else {
 474                                 if (! $seen{$item->{page}}) {
 475                                         $seen{$item->{page}}=1;
 476                                         $count++;
 477                                 }
 478                         }
 479                 }
 480         }
 481 }
 482
 483 sub needsaggregate () {
 484         return values %feeds if $config{rebuild};
 485         return grep { time - $_->{lastupdate} >= $_->{updateinterval} } values %feeds;
 486 }
 487
 488 sub aggregate (@) {
 489         eval q{use XML::Feed};
 490         error($@) if $@;
 491         eval q{use URI::Fetch};
 492         error($@) if $@;
 493
 494         foreach my $feed (@_) {
 495                 $feed->{lasttry}=time;
 496                 $feed->{newposts}=0;
 497                 $feed->{message}=sprintf(gettext("last checked %s"),
 498                         displaytime($feed->{lasttry}));
 499                 $feed->{error}=0;
 500
 501                 debug(sprintf(gettext("checking feed %s ..."), $feed->{name}));
 502
 503                 if (! length $feed->{feedurl}) {
 504                         my @urls=XML::Feed->find_feeds($feed->{url});
 505                         if (! @urls) {
 506                                 $feed->{message}=sprintf(gettext("could not find feed at %s"), $feed->{url});
 507                                 $feed->{error}=1;
 508                                 debug($feed->{message});
 509                                 next;
 510                         }
 511                         $feed->{feedurl}=pop @urls;
 512                 }
 513                 my $res=URI::Fetch->fetch($feed->{feedurl});
 514                 if (! $res) {
 515                         $feed->{message}=URI::Fetch->errstr;
 516                         $feed->{error}=1;
 517                         debug($feed->{message});
 518                         next;
 519                 }
 520
 521                 # lastupdate is only set if we were able to contact the server
 522                 $feed->{lastupdate}=$feed->{lasttry};
 523
 524                 if ($res->status == URI::Fetch::URI_GONE()) {
 525                         $feed->{message}=gettext("feed not found");
 526                         $feed->{error}=1;
 527                         debug($feed->{message});
 528                         next;
 529                 }
 530                 my $content=$res->content;
 531                 my $f=eval{XML::Feed->parse(\$content)};
 532                 if ($@) {
 533                         # One common cause of XML::Feed crashing is a feed
 534                         # that contains invalid UTF-8 sequences. Convert
 535                         # feed to ascii to try to work around.
 536                         $feed->{message}.=" ".sprintf(gettext("(invalid UTF-8 stripped from feed)"));
 537                         $f=eval {
 538                                 $content=Encode::decode_utf8($content, 0);
 539                                 XML::Feed->parse(\$content)
 540                         };
 541                 }
 542                 if ($@) {
 543                         # Another possibility is badly escaped entities.
 544                         $feed->{message}.=" ".sprintf(gettext("(feed entities escaped)"));
 545                         $content=~s/\&(?!amp)(\w+);/&amp;$1;/g;
 546                         $f=eval {
 547                                 $content=Encode::decode_utf8($content, 0);
 548                                 XML::Feed->parse(\$content)
 549                         };
 550                 }
 551                 if ($@) {
 552                         $feed->{message}=gettext("feed crashed XML::Feed!")." ($@)";
 553                         $feed->{error}=1;
 554                         debug($feed->{message});
 555                         next;
 556                 }
 557                 if (! $f) {
 558                         $feed->{message}=XML::Feed->errstr;
 559                         $feed->{error}=1;
 560                         debug($feed->{message});
 561                         next;
 562                 }
 563
 564                 foreach my $entry ($f->entries) {
 565                         # XML::Feed doesn't work around XML::Atom's bizarre
 566                         # API, so we will. Real unicode strings? Yes please.
 567                         # See [[bugs/Aggregated_Atom_feeds_are_double-encoded]]
 568                         local $XML::Atom::ForceUnicode = 1;
 569
 570                         my $c=$entry->content;
 571                         # atom feeds may have no content, only a summary
 572                         if (! defined $c && ref $entry->summary) {
 573                                 $c=$entry->summary;
 574                         }
 575
 576                         add_page(
 577                                 feed => $feed,
 578                                 copyright => $f->copyright,
 579                                 title => defined $entry->title ? decode_entities($entry->title) : "untitled",
 580                                 link => $entry->link,
 581                                 content => (defined $c && defined $c->body) ? $c->body : "",
 582                                 guid => defined $entry->id ? $entry->id : time."_".$feed->{name},
 583                                 ctime => $entry->issued ? ($entry->issued->epoch || time) : time,
 584                                 base => (defined $c && $c->can("base")) ? $c->base : undef,
 585                         );
 586                 }
 587         }
 588 }
 589
 590 sub add_page (@) {
 591         my %params=@_;
 592
 593         my $feed=$params{feed};
 594         my $guid={};
 595         my $mtime;
 596         if (exists $guids{$params{guid}}) {
 597                 # updating an existing post
 598                 $guid=$guids{$params{guid}};
 599                 return if $guid->{expired};
 600         }
 601         else {
 602                 # new post
 603                 $guid->{guid}=$params{guid};
 604                 $guids{$params{guid}}=$guid;
 605                 $mtime=$params{ctime};
 606                 $feed->{numposts}++;
 607                 $feed->{newposts}++;
 608
 609                 # assign it an unused page
 610                 my $page=titlepage($params{title});
 611                 # escape slashes and periods in title so it doesn't specify
 612                 # directory name or trigger ".." disallowing code.
 613                 $page=~s!([/.])!"__".ord($1)."__"!eg;
 614                 $page=$feed->{dir}."/".$page;
 615                 ($page)=$page=~/$config{wiki_file_regexp}/;
 616                 if (! defined $page || ! length $page) {
 617                         $page=$feed->{dir}."/item";
 618                 }
 619                 my $c="";
 620                 while (exists $IkiWiki::pagecase{lc $page.$c} ||
 621                        -e $IkiWiki::Plugin::transient::transientdir."/".htmlfn($page.$c) ||
 622                        -e "$config{srcdir}/".htmlfn($page.$c)) {
 623                         $c++
 624                 }
 625
 626                 # Make sure that the file name isn't too long.
 627                 # NB: This doesn't check for path length limits.
 628                 my $max=POSIX::pathconf($config{srcdir}, &POSIX::_PC_NAME_MAX);
 629                 if (defined $max && length(htmlfn($page)) >= $max) {
 630                         $c="";
 631                         $page=$feed->{dir}."/item";
 632                         while (exists $IkiWiki::pagecase{lc $page.$c} ||
 633                               -e $IkiWiki::Plugin::transient::transientdir."/".htmlfn($page.$c) ||
 634
 635                                -e "$config{srcdir}/".htmlfn($page.$c)) {
 636                                 $c++
 637                         }
 638                 }
 639
 640                 $guid->{page}=$page;
 641                 debug(sprintf(gettext("creating new page %s"), $page));
 642         }
 643         $guid->{feed}=$feed->{name};
 644
 645         # To write or not to write? Need to avoid writing unchanged pages
 646         # to avoid unneccessary rebuilding. The mtime from rss cannot be
 647         # trusted; let's use a digest.
 648         eval q{use Digest::MD5 'md5_hex'};
 649         error($@) if $@;
 650         require Encode;
 651         my $digest=md5_hex(Encode::encode_utf8($params{content}));
 652         return unless ! exists $guid->{md5} || $guid->{md5} ne $digest || $config{rebuild};
 653         $guid->{md5}=$digest;
 654
 655         # Create the page.
 656         my $template;
 657         eval {
 658                 $template=template($feed->{template}, blind_cache => 1);
 659         };
 660         if ($@) {
 661                 print STDERR gettext("failed to process template:")." $@";
 662                 return;
 663         }
 664         $template->param(title => $params{title})
 665                 if defined $params{title} && length($params{title});
 666         $template->param(content => wikiescape(htmlabs($params{content},
 667                 defined $params{base} ? $params{base} : $feed->{feedurl})));
 668         $template->param(name => $feed->{name});
 669         $template->param(url => $feed->{url});
 670         $template->param(copyright => $params{copyright})
 671                 if defined $params{copyright} && length $params{copyright};
 672         $template->param(permalink => IkiWiki::urlabs($params{link}, $feed->{feedurl}))
 673                 if defined $params{link};
 674         if (ref $feed->{tags}) {
 675                 $template->param(tags => [map { tag => $_ }, @{$feed->{tags}}]);
 676         }
 677         writefile(htmlfn($guid->{page}),
 678                 $IkiWiki::Plugin::transient::transientdir, $template->output);
 679
 680         if (defined $mtime && $mtime <= time) {
 681                 # Set the mtime, this lets the build process get the right
 682                 # creation time on record for the new page.
 683                 utime $mtime, $mtime,
 684                         $IkiWiki::Plugin::transient::transientdir."/".htmlfn($guid->{page});
 685                 # Store it in pagectime for expiry code to use also.
 686                 $IkiWiki::pagectime{$guid->{page}}=$mtime
 687                         unless exists $IkiWiki::pagectime{$guid->{page}};
 688         }
 689         else {
 690                 # Dummy value for expiry code.
 691                 $IkiWiki::pagectime{$guid->{page}}=time
 692                         unless exists $IkiWiki::pagectime{$guid->{page}};
 693         }
 694 }
 695
 696 sub wikiescape ($) {
 697         # escape accidental wikilinks and preprocessor stuff
 698         return encode_entities(shift, '\[\]');
 699 }
 700
 701 sub htmlabs ($$) {
 702         # Convert links in html from relative to absolute.
 703         # Note that this is a heuristic, which is not specified by the rss
 704         # spec and may not be right for all feeds. Also, see Debian
 705         # bug #381359.
 706         my $html=shift;
 707         my $urlbase=shift;
 708
 709         my $ret="";
 710         my $p = HTML::Parser->new(api_version => 3);
 711         $p->handler(default => sub { $ret.=join("", @_) }, "text");
 712         $p->handler(start => sub {
 713                 my ($tagname, $pos, $text) = @_;
 714                 if (ref $HTML::Tagset::linkElements{$tagname}) {
 715                         while (4 <= @$pos) {
 716                                 # use attribute sets from right to left
 717                                 # to avoid invalidating the offsets
 718                                 # when replacing the values
 719                                 my($k_offset, $k_len, $v_offset, $v_len) =
 720                                         splice(@$pos, -4);
 721                                 my $attrname = lc(substr($text, $k_offset, $k_len));
 722                                 next unless grep { $_ eq $attrname } @{$HTML::Tagset::linkElements{$tagname}};
 723                                 next unless $v_offset; # 0 v_offset means no value
 724                                 my $v = substr($text, $v_offset, $v_len);
 725                                 $v =~ s/^([\'\"])(.*)\1$/$2/;
 726                                 my $new_v=IkiWiki::urlabs($v, $urlbase);
 727                                 $new_v =~ s/\"/&quot;/g; # since we quote with ""
 728                                 substr($text, $v_offset, $v_len) = qq("$new_v");
 729                         }
 730                 }
 731                 $ret.=$text;
 732         }, "tagname, tokenpos, text");
 733         $p->parse($html);
 734         $p->eof;
 735
 736         return $ret;
 737 }
 738
 739 sub htmlfn ($) {
 740         return shift().".".($config{aggregateinternal} ? "_aggregated" : $config{htmlext});
 741 }
 742
 743 my $aggregatelock;
 744
 745 sub lockaggregate () {
 746         # Take an exclusive lock to prevent multiple concurrent aggregators.
 747         # Returns true if the lock was aquired.
 748         if (! -d $config{wikistatedir}) {
 749                 mkdir($config{wikistatedir});
 750         }
 751         open($aggregatelock, '>', "$config{wikistatedir}/aggregatelock") ||
 752                 error ("cannot open to $config{wikistatedir}/aggregatelock: $!");
 753         if (! flock($aggregatelock, 2 | 4)) { # LOCK_EX | LOCK_NB
 754                 close($aggregatelock) || error("failed closing aggregatelock: $!");
 755                 return 0;
 756         }
 757         return 1;
 758 }
 759
 760 sub unlockaggregate () {
 761         return close($aggregatelock) if $aggregatelock;
 762         return;
 763 }
 764
 765 1