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 2.00;
   8 use HTML::Parser;
   9 use HTML::Tagset;
  10 use HTML::Entities;
  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 => "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         if (exists $config{aggregate_webtrigger} && $config{aggregate_webtrigger}) {
  25                 hook(type => "cgi", id => "aggregate", call => \&cgi);
  26         }
  27 } # }}}
  28
  29 sub getopt () { #{{{
  30         eval q{use Getopt::Long};
  31         error($@) if $@;
  32         Getopt::Long::Configure('pass_through');
  33         GetOptions("aggregate" => \$config{aggregate});
  34 } #}}}
  35
  36 sub checkconfig () { #{{{
  37         if ($config{aggregate} && ! ($config{post_commit} &&
  38                                      IkiWiki::commit_hook_enabled())) {
  39                 launchaggregation();
  40         }
  41 } #}}}
  42
  43 sub cgi ($) { #{{{
  44         my $cgi=shift;
  45
  46         if (defined $cgi->param('do') &&
  47             $cgi->param("do") eq "aggregate_webtrigger") {
  48                 $|=1;
  49                 print "Content-Type: text/plain\n\n";
  50                 $config{cgi}=0;
  51                 $config{verbose}=1;
  52                 $config{syslog}=0;
  53                 print gettext("Aggregation triggered via web.")."\n\n";
  54                 if (launchaggregation()) {
  55                         IkiWiki::lockwiki();
  56                         IkiWiki::loadindex();
  57                         require IkiWiki::Render;
  58                         IkiWiki::refresh();
  59                         IkiWiki::saveindex();
  60                 }
  61                 else {
  62                         print gettext("Nothing to do right now, all feeds are up-to-date!")."\n";
  63                 }
  64                 exit 0;
  65         }
  66 } #}}}
  67
  68 sub launchaggregation () { #{{{
  69         # See if any feeds need aggregation.
  70         loadstate();
  71         my @feeds=needsaggregate();
  72         return unless @feeds;
  73         if (! lockaggregate()) {
  74                 debug("an aggregation process is already running");
  75                 return;
  76         }
  77         # force a later rebuild of source pages
  78         $IkiWiki::forcerebuild{$_->{sourcepage}}=1
  79                 foreach @feeds;
  80
  81         # Fork a child process to handle the aggregation.
  82         # The parent process will then handle building the
  83         # result. This avoids messy code to clear state
  84         # accumulated while aggregating.
  85         defined(my $pid = fork) or error("Can't fork: $!");
  86         if (! $pid) {
  87                 IkiWiki::loadindex();
  88                 # Aggregation happens without the main wiki lock
  89                 # being held. This allows editing pages etc while
  90                 # aggregation is running.
  91                 aggregate(@feeds);
  92
  93                 IkiWiki::lockwiki;
  94                 # Merge changes, since aggregation state may have
  95                 # changed on disk while the aggregation was happening.
  96                 mergestate();
  97                 expire();
  98                 savestate();
  99                 IkiWiki::unlockwiki;
 100                 exit 0;
 101         }
 102         waitpid($pid,0);
 103         if ($?) {
 104                 error "aggregation failed with code $?";
 105         }
 106
 107         clearstate();
 108         unlockaggregate();
 109
 110         return 1;
 111 } #}}}
 112
 113 sub needsbuild (@) { #{{{
 114         my $needsbuild=shift;
 115
 116         loadstate();
 117
 118         foreach my $feed (values %feeds) {
 119                 if (exists $pagesources{$feed->{sourcepage}} &&
 120                     grep { $_ eq $pagesources{$feed->{sourcepage}} } @$needsbuild) {
 121                         # Mark all feeds originating on this page as
 122                         # not yet seen; preprocess will unmark those that
 123                         # still exist.
 124                         markunseen($feed->{sourcepage});
 125                 }
 126         }
 127 } # }}}
 128
 129 sub preprocess (@) { #{{{
 130         my %params=@_;
 131
 132         foreach my $required (qw{name url}) {
 133                 if (! exists $params{$required}) {
 134                         return "[[aggregate ".sprintf(gettext("missing %s parameter"), $required)."]]";
 135                 }
 136         }
 137
 138         my $feed={};
 139         my $name=$params{name};
 140         if (exists $feeds{$name}) {
 141                 $feed=$feeds{$name};
 142         }
 143         else {
 144                 $feeds{$name}=$feed;
 145         }
 146         $feed->{name}=$name;
 147         $feed->{sourcepage}=$params{page};
 148         $feed->{url}=$params{url};
 149         my $dir=exists $params{dir} ? $params{dir} : $params{page}."/".IkiWiki::titlepage($params{name});
 150         $dir=~s/^\/+//;
 151         ($dir)=$dir=~/$config{wiki_file_regexp}/;
 152         $feed->{dir}=$dir;
 153         $feed->{feedurl}=defined $params{feedurl} ? $params{feedurl} : "";
 154         $feed->{updateinterval}=defined $params{updateinterval} ? $params{updateinterval} * 60 : 15 * 60;
 155         $feed->{expireage}=defined $params{expireage} ? $params{expireage} : 0;
 156         $feed->{expirecount}=defined $params{expirecount} ? $params{expirecount} : 0;
 157         delete $feed->{unseen};
 158         $feed->{lastupdate}=0 unless defined $feed->{lastupdate};
 159         $feed->{numposts}=0 unless defined $feed->{numposts};
 160         $feed->{newposts}=0 unless defined $feed->{newposts};
 161         $feed->{message}=gettext("new feed") unless defined $feed->{message};
 162         $feed->{error}=0 unless defined $feed->{error};
 163         $feed->{tags}=[];
 164         while (@_) {
 165                 my $key=shift;
 166                 my $value=shift;
 167                 if ($key eq 'tag') {
 168                         push @{$feed->{tags}}, $value;
 169                 }
 170         }
 171
 172         return "<a href=\"".$feed->{url}."\">".$feed->{name}."</a>: ".
 173                ($feed->{error} ? "<em>" : "").$feed->{message}.
 174                ($feed->{error} ? "</em>" : "").
 175                " (".$feed->{numposts}." ".gettext("posts").
 176                ($feed->{newposts} ? "; ".$feed->{newposts}.
 177                                     " ".gettext("new") : "").
 178                ")";
 179 } # }}}
 180
 181 sub delete (@) { #{{{
 182         my @files=@_;
 183
 184         # Remove feed data for removed pages.
 185         foreach my $file (@files) {
 186                 my $page=pagename($file);
 187                 markunseen($page);
 188         }
 189 } #}}}
 190
 191 sub markunseen ($) { #{{{
 192         my $page=shift;
 193
 194         foreach my $id (keys %feeds) {
 195                 if ($feeds{$id}->{sourcepage} eq $page) {
 196                         $feeds{$id}->{unseen}=1;
 197                 }
 198         }
 199 } #}}}
 200
 201 my $state_loaded=0;
 202
 203 sub loadstate () { #{{{
 204         return if $state_loaded;
 205         $state_loaded=1;
 206         if (-e "$config{wikistatedir}/aggregate") {
 207                 open(IN, "$config{wikistatedir}/aggregate") ||
 208                         die "$config{wikistatedir}/aggregate: $!";
 209                 while (<IN>) {
 210                         $_=IkiWiki::possibly_foolish_untaint($_);
 211                         chomp;
 212                         my $data={};
 213                         foreach my $i (split(/ /, $_)) {
 214                                 my ($field, $val)=split(/=/, $i, 2);
 215                                 if ($field eq "name" || $field eq "feed" ||
 216                                     $field eq "guid" || $field eq "message") {
 217                                         $data->{$field}=decode_entities($val, " \t\n");
 218                                 }
 219                                 elsif ($field eq "tag") {
 220                                         push @{$data->{tags}}, $val;
 221                                 }
 222                                 else {
 223                                         $data->{$field}=$val;
 224                                 }
 225                         }
 226
 227                         if (exists $data->{name}) {
 228                                 $feeds{$data->{name}}=$data;
 229                         }
 230                         elsif (exists $data->{guid}) {
 231                                 $guids{$data->{guid}}=$data;
 232                         }
 233                 }
 234
 235                 close IN;
 236         }
 237 } #}}}
 238
 239 sub savestate () { #{{{
 240         return unless $state_loaded;
 241         garbage_collect();
 242         my $newfile="$config{wikistatedir}/aggregate.new";
 243         my $cleanup = sub { unlink($newfile) };
 244         open (OUT, ">$newfile") || error("open $newfile: $!", $cleanup);
 245         foreach my $data (values %feeds, values %guids) {
 246                 my @line;
 247                 foreach my $field (keys %$data) {
 248                         if ($field eq "name" || $field eq "feed" ||
 249                             $field eq "guid" || $field eq "message") {
 250                                 push @line, "$field=".encode_entities($data->{$field}, " \t\n");
 251                         }
 252                         elsif ($field eq "tags") {
 253                                 push @line, "tag=$_" foreach @{$data->{tags}};
 254                         }
 255                         else {
 256                                 push @line, "$field=".$data->{$field};
 257                         }
 258                 }
 259                 print OUT join(" ", @line)."\n" || error("write $newfile: $!", $cleanup);
 260         }
 261         close OUT || error("save $newfile: $!", $cleanup);
 262         rename($newfile, "$config{wikistatedir}/aggregate") ||
 263                 error("rename $newfile: $!", $cleanup);
 264 } #}}}
 265
 266 sub garbage_collect () { #{{{
 267         foreach my $name (keys %feeds) {
 268                 # remove any feeds that were not seen while building the pages
 269                 # that used to contain them
 270                 if ($feeds{$name}->{unseen}) {
 271                         delete $feeds{$name};
 272                 }
 273         }
 274
 275         foreach my $guid (values %guids) {
 276                 # any guid whose feed is gone should be removed
 277                 if (! exists $feeds{$guid->{feed}}) {
 278                         unlink pagefile($guid->{page})
 279                                 if exists $guid->{page};
 280                         delete $guids{$guid->{guid}};
 281                 }
 282                 # handle expired guids
 283                 elsif ($guid->{expired} && exists $guid->{page}) {
 284                         unlink pagefile($guid->{page});
 285                         delete $guid->{page};
 286                         delete $guid->{md5};
 287                 }
 288         }
 289 } #}}}
 290
 291 sub mergestate () { #{{{
 292         # Load the current state in from disk, and merge into it
 293         # values from the state in memory that might have changed
 294         # during aggregation.
 295         my %myfeeds=%feeds;
 296         my %myguids=%guids;
 297         clearstate();
 298         loadstate();
 299
 300         # All that can change in feed state during aggregation is a few
 301         # fields.
 302         foreach my $name (keys %myfeeds) {
 303                 if (exists $feeds{$name}) {
 304                         foreach my $field (qw{message lastupdate numposts
 305                                               newposts error}) {
 306                                 $feeds{$name}->{$field}=$myfeeds{$name}->{$field};
 307                         }
 308                 }
 309         }
 310
 311         # New guids can be created during aggregation.
 312         # It's also possible that guids were removed from the on-disk state
 313         # while the aggregation was in process. That would only happen if
 314         # their feed was also removed, so any removed guids added back here
 315         # will be garbage collected later.
 316         foreach my $guid (keys %myguids) {
 317                 if (! exists $guids{$guid}) {
 318                         $guids{$guid}=$myguids{$guid};
 319                 }
 320         }
 321 } #}}}
 322
 323 sub clearstate () { #{{{
 324         %feeds=();
 325         %guids=();
 326         $state_loaded=0;
 327 } #}}}
 328
 329 sub expire () { #{{{
 330         foreach my $feed (values %feeds) {
 331                 next unless $feed->{expireage} || $feed->{expirecount};
 332                 my $count=0;
 333                 my %seen;
 334                 foreach my $item (sort { $IkiWiki::pagectime{$b->{page}} <=> $IkiWiki::pagectime{$a->{page}} }
 335                                   grep { exists $_->{page} && $_->{feed} eq $feed->{name} && $IkiWiki::pagectime{$_->{page}} }
 336                                   values %guids) {
 337                         if ($feed->{expireage}) {
 338                                 my $days_old = (time - $IkiWiki::pagectime{$item->{page}}) / 60 / 60 / 24;
 339                                 if ($days_old > $feed->{expireage}) {
 340                                         debug(sprintf(gettext("expiring %s (%s days old)"),
 341                                                 $item->{page}, int($days_old)));
 342                                         $item->{expired}=1;
 343                                 }
 344                         }
 345                         elsif ($feed->{expirecount} &&
 346                                $count >= $feed->{expirecount}) {
 347                                 debug(sprintf(gettext("expiring %s"), $item->{page}));
 348                                 $item->{expired}=1;
 349                         }
 350                         else {
 351                                 if (! $seen{$item->{page}}) {
 352                                         $seen{$item->{page}}=1;
 353                                         $count++;
 354                                 }
 355                         }
 356                 }
 357         }
 358 } #}}}
 359
 360 sub needsaggregate () { #{{{
 361         return values %feeds if $config{rebuild};
 362         return grep { time - $_->{lastupdate} >= $_->{updateinterval} } values %feeds;
 363 } #}}}
 364
 365 sub aggregate (@) { #{{{
 366         eval q{use XML::Feed};
 367         error($@) if $@;
 368         eval q{use URI::Fetch};
 369         error($@) if $@;
 370
 371         foreach my $feed (@_) {
 372                 $feed->{lastupdate}=time;
 373                 $feed->{newposts}=0;
 374                 $feed->{message}=sprintf(gettext("processed ok at %s"),
 375                         displaytime($feed->{lastupdate}));
 376                 $feed->{error}=0;
 377
 378                 debug(sprintf(gettext("checking feed %s ..."), $feed->{name}));
 379
 380                 if (! length $feed->{feedurl}) {
 381                         my @urls=XML::Feed->find_feeds($feed->{url});
 382                         if (! @urls) {
 383                                 $feed->{message}=sprintf(gettext("could not find feed at %s"), $feed->{url});
 384                                 $feed->{error}=1;
 385                                 debug($feed->{message});
 386                                 next;
 387                         }
 388                         $feed->{feedurl}=pop @urls;
 389                 }
 390                 my $res=URI::Fetch->fetch($feed->{feedurl});
 391                 if (! $res) {
 392                         $feed->{message}=URI::Fetch->errstr;
 393                         $feed->{error}=1;
 394                         debug($feed->{message});
 395                         next;
 396                 }
 397                 if ($res->status == URI::Fetch::URI_GONE()) {
 398                         $feed->{message}=gettext("feed not found");
 399                         $feed->{error}=1;
 400                         debug($feed->{message});
 401                         next;
 402                 }
 403                 my $content=$res->content;
 404                 my $f=eval{XML::Feed->parse(\$content)};
 405                 if ($@) {
 406                         # One common cause of XML::Feed crashing is a feed
 407                         # that contains invalid UTF-8 sequences. Convert
 408                         # feed to ascii to try to work around.
 409                         $feed->{message}.=" ".sprintf(gettext("(invalid UTF-8 stripped from feed)"));
 410                         $content=Encode::decode_utf8($content);
 411                         $f=eval{XML::Feed->parse(\$content)};
 412                 }
 413                 if ($@) {
 414                         # Another possibility is badly escaped entities.
 415                         $feed->{message}.=" ".sprintf(gettext("(feed entities escaped)"));
 416                         $content=~s/\&(?!amp)(\w+);/&amp;$1;/g;
 417                         $content=Encode::decode_utf8($content);
 418                         $f=eval{XML::Feed->parse(\$content)};
 419                 }
 420                 if ($@) {
 421                         $feed->{message}=gettext("feed crashed XML::Feed!")." ($@)";
 422                         $feed->{error}=1;
 423                         debug($feed->{message});
 424                         next;
 425                 }
 426                 if (! $f) {
 427                         $feed->{message}=XML::Feed->errstr;
 428                         $feed->{error}=1;
 429                         debug($feed->{message});
 430                         next;
 431                 }
 432
 433                 foreach my $entry ($f->entries) {
 434                         add_page(
 435                                 feed => $feed,
 436                                 copyright => $f->copyright,
 437                                 title => defined $entry->title ? decode_entities($entry->title) : "untitled",
 438                                 link => $entry->link,
 439                                 content => defined $entry->content->body ? $entry->content->body : "",
 440                                 guid => defined $entry->id ? $entry->id : time."_".$feed->{name},
 441                                 ctime => $entry->issued ? ($entry->issued->epoch || time) : time,
 442                         );
 443                 }
 444         }
 445 } #}}}
 446
 447 sub add_page (@) { #{{{
 448         my %params=@_;
 449
 450         my $feed=$params{feed};
 451         my $guid={};
 452         my $mtime;
 453         if (exists $guids{$params{guid}}) {
 454                 # updating an existing post
 455                 $guid=$guids{$params{guid}};
 456                 return if $guid->{expired};
 457         }
 458         else {
 459                 # new post
 460                 $guid->{guid}=$params{guid};
 461                 $guids{$params{guid}}=$guid;
 462                 $mtime=$params{ctime};
 463                 $feed->{numposts}++;
 464                 $feed->{newposts}++;
 465
 466                 # assign it an unused page
 467                 my $page=IkiWiki::titlepage($params{title});
 468                 # escape slashes and periods in title so it doesn't specify
 469                 # directory name or trigger ".." disallowing code.
 470                 $page=~s!([/.])!"__".ord($1)."__"!eg;
 471                 $page=$feed->{dir}."/".$page;
 472                 ($page)=$page=~/$config{wiki_file_regexp}/;
 473                 if (! defined $page || ! length $page) {
 474                         $page=$feed->{dir}."/item";
 475                 }
 476                 my $c="";
 477                 while (exists $IkiWiki::pagecase{lc $page.$c} ||
 478                        -e pagefile($page.$c)) {
 479                         $c++
 480                 }
 481
 482                 # Make sure that the file name isn't too long.
 483                 # NB: This doesn't check for path length limits.
 484                 my $max=POSIX::pathconf($config{srcdir}, &POSIX::_PC_NAME_MAX);
 485                 if (defined $max && length(htmlfn($page)) >= $max) {
 486                         $c="";
 487                         $page=$feed->{dir}."/item";
 488                         while (exists $IkiWiki::pagecase{lc $page.$c} ||
 489                                -e pagefile($page.$c)) {
 490                                 $c++
 491                         }
 492                 }
 493
 494                 $guid->{page}=$page;
 495                 debug(sprintf(gettext("creating new page %s"), $page));
 496         }
 497         $guid->{feed}=$feed->{name};
 498
 499         # To write or not to write? Need to avoid writing unchanged pages
 500         # to avoid unneccessary rebuilding. The mtime from rss cannot be
 501         # trusted; let's use a digest.
 502         eval q{use Digest::MD5 'md5_hex'};
 503         error($@) if $@;
 504         require Encode;
 505         my $digest=md5_hex(Encode::encode_utf8($params{content}));
 506         return unless ! exists $guid->{md5} || $guid->{md5} ne $digest || $config{rebuild};
 507         $guid->{md5}=$digest;
 508
 509         # Create the page.
 510         my $template=template("aggregatepost.tmpl", blind_cache => 1);
 511         $template->param(title => $params{title})
 512                 if defined $params{title} && length($params{title});
 513         $template->param(content => htmlescape(htmlabs($params{content}, $feed->{feedurl})));
 514         $template->param(name => $feed->{name});
 515         $template->param(url => $feed->{url});
 516         $template->param(copyright => $params{copyright})
 517                 if defined $params{copyright} && length $params{copyright};
 518         $template->param(permalink => urlabs($params{link}, $feed->{feedurl}))
 519                 if defined $params{link};
 520         if (ref $feed->{tags}) {
 521                 $template->param(tags => [map { tag => $_ }, @{$feed->{tags}}]);
 522         }
 523         writefile(htmlfn($guid->{page}), $config{srcdir},
 524                 $template->output);
 525
 526         # Set the mtime, this lets the build process get the right creation
 527         # time on record for the new page.
 528         utime $mtime, $mtime, pagefile($guid->{page})
 529                 if defined $mtime && $mtime <= time;
 530 } #}}}
 531
 532 sub htmlescape ($) { #{{{
 533         # escape accidental wikilinks and preprocessor stuff
 534         my $html=shift;
 535         $html=~s/(?<!\\)\[\[/\\\[\[/g;
 536         return $html;
 537 } #}}}
 538
 539 sub urlabs ($$) { #{{{
 540         my $url=shift;
 541         my $urlbase=shift;
 542
 543         URI->new_abs($url, $urlbase)->as_string;
 544 } #}}}
 545
 546 sub htmlabs ($$) { #{{{
 547         # Convert links in html from relative to absolute.
 548         # Note that this is a heuristic, which is not specified by the rss
 549         # spec and may not be right for all feeds. Also, see Debian
 550         # bug #381359.
 551         my $html=shift;
 552         my $urlbase=shift;
 553
 554         my $ret="";
 555         my $p = HTML::Parser->new(api_version => 3);
 556         $p->handler(default => sub { $ret.=join("", @_) }, "text");
 557         $p->handler(start => sub {
 558                 my ($tagname, $pos, $text) = @_;
 559                 if (ref $HTML::Tagset::linkElements{$tagname}) {
 560                         while (4 <= @$pos) {
 561                                 # use attribute sets from right to left
 562                                 # to avoid invalidating the offsets
 563                                 # when replacing the values
 564                                 my($k_offset, $k_len, $v_offset, $v_len) =
 565                                         splice(@$pos, -4);
 566                                 my $attrname = lc(substr($text, $k_offset, $k_len));
 567                                 next unless grep { $_ eq $attrname } @{$HTML::Tagset::linkElements{$tagname}};
 568                                 next unless $v_offset; # 0 v_offset means no value
 569                                 my $v = substr($text, $v_offset, $v_len);
 570                                 $v =~ s/^([\'\"])(.*)\1$/$2/;
 571                                 my $new_v=urlabs($v, $urlbase);
 572                                 $new_v =~ s/\"/&quot;/g; # since we quote with ""
 573                                 substr($text, $v_offset, $v_len) = qq("$new_v");
 574                         }
 575                 }
 576                 $ret.=$text;
 577         }, "tagname, tokenpos, text");
 578         $p->parse($html);
 579         $p->eof;
 580
 581         return $ret;
 582 } #}}}
 583
 584 sub pagefile ($) { #{{{
 585         my $page=shift;
 586
 587         return "$config{srcdir}/".htmlfn($page);
 588 } #}}}
 589
 590 sub htmlfn ($) { #{{{
 591         return shift().".".$config{htmlext};
 592 } #}}}
 593
 594 my $aggregatelock;
 595
 596 sub lockaggregate () { #{{{
 597         # Take an exclusive lock to prevent multiple concurrent aggregators.
 598         # Returns true if the lock was aquired.
 599         if (! -d $config{wikistatedir}) {
 600                 mkdir($config{wikistatedir});
 601         }
 602         open($aggregatelock, '>', "$config{wikistatedir}/aggregatelock") ||
 603                 error ("cannot open to $config{wikistatedir}/aggregatelock: $!");
 604         if (! flock($aggregatelock, 2 | 4)) { # LOCK_EX | LOCK_NB
 605                 close($aggregatelock) || error("failed closing aggregatelock: $!");
 606                 return 0;
 607         }
 608         return 1;
 609 } #}}}
 610
 611 sub unlockaggregate () { #{{{
 612         return close($aggregatelock) if $aggregatelock;
 613         return;
 614 } #}}}
 615
 616 1