627 lines
17 KiB
Perl
627 lines
17 KiB
Perl
#!/usr/bin/perl
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# Feed aggregation plugin.
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package IkiWiki::Plugin::aggregate;
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use warnings;
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use strict;
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use IkiWiki 2.00;
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use HTML::Parser;
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use HTML::Tagset;
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use HTML::Entities;
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use URI;
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use open qw{:utf8 :std};
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my %feeds;
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my %guids;
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sub import { #{{{
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hook(type => "getopt", id => "aggregate", call => \&getopt);
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hook(type => "checkconfig", id => "aggregate", call => \&checkconfig);
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hook(type => "needsbuild", id => "aggregate", call => \&needsbuild);
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hook(type => "preprocess", id => "aggregate", call => \&preprocess);
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hook(type => "delete", id => "aggregate", call => \&delete);
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hook(type => "savestate", id => "aggregate", call => \&savestate);
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if (exists $config{aggregate_webtrigger} && $config{aggregate_webtrigger}) {
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hook(type => "cgi", id => "aggregate", call => \&cgi);
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}
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} # }}}
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sub getopt () { #{{{
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eval q{use Getopt::Long};
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error($@) if $@;
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Getopt::Long::Configure('pass_through');
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GetOptions(
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"aggregate" => \$config{aggregate},
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"aggregateinternal!" => \$config{aggregateinternal},
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);
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} #}}}
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sub checkconfig () { #{{{
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if ($config{aggregate} && ! ($config{post_commit} &&
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IkiWiki::commit_hook_enabled())) {
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launchaggregation();
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}
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} #}}}
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sub cgi ($) { #{{{
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my $cgi=shift;
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if (defined $cgi->param('do') &&
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$cgi->param("do") eq "aggregate_webtrigger") {
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$|=1;
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print "Content-Type: text/plain\n\n";
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$config{cgi}=0;
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$config{verbose}=1;
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$config{syslog}=0;
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print gettext("Aggregation triggered via web.")."\n\n";
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if (launchaggregation()) {
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IkiWiki::lockwiki();
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IkiWiki::loadindex();
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require IkiWiki::Render;
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IkiWiki::refresh();
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IkiWiki::saveindex();
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}
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else {
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print gettext("Nothing to do right now, all feeds are up-to-date!")."\n";
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}
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exit 0;
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}
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} #}}}
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sub launchaggregation () { #{{{
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# See if any feeds need aggregation.
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loadstate();
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my @feeds=needsaggregate();
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return unless @feeds;
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if (! lockaggregate()) {
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debug("an aggregation process is already running");
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return;
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}
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# force a later rebuild of source pages
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$IkiWiki::forcerebuild{$_->{sourcepage}}=1
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foreach @feeds;
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# Fork a child process to handle the aggregation.
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# The parent process will then handle building the
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# result. This avoids messy code to clear state
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# accumulated while aggregating.
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defined(my $pid = fork) or error("Can't fork: $!");
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if (! $pid) {
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IkiWiki::loadindex();
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# Aggregation happens without the main wiki lock
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# being held. This allows editing pages etc while
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# aggregation is running.
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aggregate(@feeds);
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IkiWiki::lockwiki;
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# Merge changes, since aggregation state may have
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# changed on disk while the aggregation was happening.
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mergestate();
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expire();
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savestate();
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IkiWiki::unlockwiki;
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exit 0;
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}
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waitpid($pid,0);
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if ($?) {
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error "aggregation failed with code $?";
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}
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clearstate();
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unlockaggregate();
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return 1;
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} #}}}
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sub needsbuild (@) { #{{{
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my $needsbuild=shift;
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loadstate();
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foreach my $feed (values %feeds) {
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if (exists $pagesources{$feed->{sourcepage}} &&
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grep { $_ eq $pagesources{$feed->{sourcepage}} } @$needsbuild) {
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# Mark all feeds originating on this page as
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# not yet seen; preprocess will unmark those that
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# still exist.
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markunseen($feed->{sourcepage});
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}
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}
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} # }}}
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sub preprocess (@) { #{{{
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my %params=@_;
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foreach my $required (qw{name url}) {
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if (! exists $params{$required}) {
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return "[[aggregate ".sprintf(gettext("missing %s parameter"), $required)."]]";
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}
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}
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my $feed={};
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my $name=$params{name};
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if (exists $feeds{$name}) {
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$feed=$feeds{$name};
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}
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else {
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$feeds{$name}=$feed;
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}
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$feed->{name}=$name;
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$feed->{sourcepage}=$params{page};
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$feed->{url}=$params{url};
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my $dir=exists $params{dir} ? $params{dir} : $params{page}."/".IkiWiki::titlepage($params{name});
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$dir=~s/^\/+//;
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($dir)=$dir=~/$config{wiki_file_regexp}/;
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$feed->{dir}=$dir;
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$feed->{feedurl}=defined $params{feedurl} ? $params{feedurl} : "";
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$feed->{updateinterval}=defined $params{updateinterval} ? $params{updateinterval} * 60 : 15 * 60;
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$feed->{expireage}=defined $params{expireage} ? $params{expireage} : 0;
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$feed->{expirecount}=defined $params{expirecount} ? $params{expirecount} : 0;
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if (exists $params{template}) {
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$params{template}=~s/[^-_a-zA-Z0-9]+//g;
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}
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else {
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$params{template} = "aggregatepost"
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}
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$feed->{template}=$params{template} . ".tmpl";
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delete $feed->{unseen};
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$feed->{lastupdate}=0 unless defined $feed->{lastupdate};
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$feed->{numposts}=0 unless defined $feed->{numposts};
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$feed->{newposts}=0 unless defined $feed->{newposts};
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$feed->{message}=gettext("new feed") unless defined $feed->{message};
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$feed->{error}=0 unless defined $feed->{error};
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$feed->{tags}=[];
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while (@_) {
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my $key=shift;
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my $value=shift;
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if ($key eq 'tag') {
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push @{$feed->{tags}}, $value;
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}
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}
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return "<a href=\"".$feed->{url}."\">".$feed->{name}."</a>: ".
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($feed->{error} ? "<em>" : "").$feed->{message}.
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($feed->{error} ? "</em>" : "").
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" (".$feed->{numposts}." ".gettext("posts").
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($feed->{newposts} ? "; ".$feed->{newposts}.
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" ".gettext("new") : "").
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")";
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} # }}}
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sub delete (@) { #{{{
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my @files=@_;
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# Remove feed data for removed pages.
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foreach my $file (@files) {
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my $page=pagename($file);
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markunseen($page);
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}
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} #}}}
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sub markunseen ($) { #{{{
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my $page=shift;
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foreach my $id (keys %feeds) {
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if ($feeds{$id}->{sourcepage} eq $page) {
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$feeds{$id}->{unseen}=1;
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}
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}
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} #}}}
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my $state_loaded=0;
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sub loadstate () { #{{{
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return if $state_loaded;
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$state_loaded=1;
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if (-e "$config{wikistatedir}/aggregate") {
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open(IN, "$config{wikistatedir}/aggregate") ||
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die "$config{wikistatedir}/aggregate: $!";
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while (<IN>) {
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$_=IkiWiki::possibly_foolish_untaint($_);
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chomp;
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my $data={};
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foreach my $i (split(/ /, $_)) {
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my ($field, $val)=split(/=/, $i, 2);
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if ($field eq "name" || $field eq "feed" ||
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$field eq "guid" || $field eq "message") {
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$data->{$field}=decode_entities($val, " \t\n");
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}
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elsif ($field eq "tag") {
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push @{$data->{tags}}, $val;
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}
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else {
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$data->{$field}=$val;
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}
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}
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if (exists $data->{name}) {
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$feeds{$data->{name}}=$data;
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}
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elsif (exists $data->{guid}) {
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$guids{$data->{guid}}=$data;
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}
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}
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close IN;
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}
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} #}}}
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sub savestate () { #{{{
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return unless $state_loaded;
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garbage_collect();
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my $newfile="$config{wikistatedir}/aggregate.new";
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my $cleanup = sub { unlink($newfile) };
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open (OUT, ">$newfile") || error("open $newfile: $!", $cleanup);
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foreach my $data (values %feeds, values %guids) {
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my @line;
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foreach my $field (keys %$data) {
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if ($field eq "name" || $field eq "feed" ||
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$field eq "guid" || $field eq "message") {
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push @line, "$field=".encode_entities($data->{$field}, " \t\n");
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}
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elsif ($field eq "tags") {
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push @line, "tag=$_" foreach @{$data->{tags}};
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}
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else {
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push @line, "$field=".$data->{$field};
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}
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}
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print OUT join(" ", @line)."\n" || error("write $newfile: $!", $cleanup);
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}
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close OUT || error("save $newfile: $!", $cleanup);
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rename($newfile, "$config{wikistatedir}/aggregate") ||
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error("rename $newfile: $!", $cleanup);
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} #}}}
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sub garbage_collect () { #{{{
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foreach my $name (keys %feeds) {
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# remove any feeds that were not seen while building the pages
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# that used to contain them
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if ($feeds{$name}->{unseen}) {
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delete $feeds{$name};
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}
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}
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foreach my $guid (values %guids) {
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# any guid whose feed is gone should be removed
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if (! exists $feeds{$guid->{feed}}) {
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unlink pagefile($guid->{page})
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if exists $guid->{page};
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delete $guids{$guid->{guid}};
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}
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# handle expired guids
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elsif ($guid->{expired} && exists $guid->{page}) {
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unlink pagefile($guid->{page});
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delete $guid->{page};
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delete $guid->{md5};
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}
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}
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} #}}}
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sub mergestate () { #{{{
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# Load the current state in from disk, and merge into it
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# values from the state in memory that might have changed
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# during aggregation.
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my %myfeeds=%feeds;
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my %myguids=%guids;
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clearstate();
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loadstate();
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# All that can change in feed state during aggregation is a few
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# fields.
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foreach my $name (keys %myfeeds) {
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if (exists $feeds{$name}) {
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foreach my $field (qw{message lastupdate numposts
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newposts error}) {
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$feeds{$name}->{$field}=$myfeeds{$name}->{$field};
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}
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}
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}
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# New guids can be created during aggregation.
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# It's also possible that guids were removed from the on-disk state
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# while the aggregation was in process. That would only happen if
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# their feed was also removed, so any removed guids added back here
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# will be garbage collected later.
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foreach my $guid (keys %myguids) {
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if (! exists $guids{$guid}) {
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$guids{$guid}=$myguids{$guid};
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}
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}
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} #}}}
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sub clearstate () { #{{{
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%feeds=();
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%guids=();
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$state_loaded=0;
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} #}}}
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sub expire () { #{{{
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foreach my $feed (values %feeds) {
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next unless $feed->{expireage} || $feed->{expirecount};
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my $count=0;
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my %seen;
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foreach my $item (sort { $IkiWiki::pagectime{$b->{page}} <=> $IkiWiki::pagectime{$a->{page}} }
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grep { exists $_->{page} && $_->{feed} eq $feed->{name} && $IkiWiki::pagectime{$_->{page}} }
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values %guids) {
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if ($feed->{expireage}) {
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my $days_old = (time - $IkiWiki::pagectime{$item->{page}}) / 60 / 60 / 24;
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if ($days_old > $feed->{expireage}) {
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debug(sprintf(gettext("expiring %s (%s days old)"),
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$item->{page}, int($days_old)));
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$item->{expired}=1;
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}
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}
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elsif ($feed->{expirecount} &&
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$count >= $feed->{expirecount}) {
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debug(sprintf(gettext("expiring %s"), $item->{page}));
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$item->{expired}=1;
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}
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else {
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if (! $seen{$item->{page}}) {
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$seen{$item->{page}}=1;
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$count++;
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}
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}
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}
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}
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} #}}}
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sub needsaggregate () { #{{{
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return values %feeds if $config{rebuild};
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return grep { time - $_->{lastupdate} >= $_->{updateinterval} } values %feeds;
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} #}}}
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sub aggregate (@) { #{{{
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eval q{use XML::Feed};
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error($@) if $@;
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eval q{use URI::Fetch};
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error($@) if $@;
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foreach my $feed (@_) {
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$feed->{lastupdate}=time;
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$feed->{newposts}=0;
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$feed->{message}=sprintf(gettext("processed ok at %s"),
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displaytime($feed->{lastupdate}));
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$feed->{error}=0;
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debug(sprintf(gettext("checking feed %s ..."), $feed->{name}));
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if (! length $feed->{feedurl}) {
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my @urls=XML::Feed->find_feeds($feed->{url});
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if (! @urls) {
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$feed->{message}=sprintf(gettext("could not find feed at %s"), $feed->{url});
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$feed->{error}=1;
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debug($feed->{message});
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next;
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}
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$feed->{feedurl}=pop @urls;
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}
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my $res=URI::Fetch->fetch($feed->{feedurl});
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if (! $res) {
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$feed->{message}=URI::Fetch->errstr;
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$feed->{error}=1;
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debug($feed->{message});
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next;
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}
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if ($res->status == URI::Fetch::URI_GONE()) {
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$feed->{message}=gettext("feed not found");
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$feed->{error}=1;
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debug($feed->{message});
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next;
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}
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my $content=$res->content;
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my $f=eval{XML::Feed->parse(\$content)};
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if ($@) {
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# One common cause of XML::Feed crashing is a feed
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# that contains invalid UTF-8 sequences. Convert
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# feed to ascii to try to work around.
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$feed->{message}.=" ".sprintf(gettext("(invalid UTF-8 stripped from feed)"));
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$content=Encode::decode_utf8($content, 0);
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$f=eval{XML::Feed->parse(\$content)};
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}
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if ($@) {
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# Another possibility is badly escaped entities.
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$feed->{message}.=" ".sprintf(gettext("(feed entities escaped)"));
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$content=~s/\&(?!amp)(\w+);/&$1;/g;
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$content=Encode::decode_utf8($content, 0);
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$f=eval{XML::Feed->parse(\$content)};
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}
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if ($@) {
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$feed->{message}=gettext("feed crashed XML::Feed!")." ($@)";
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$feed->{error}=1;
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debug($feed->{message});
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next;
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}
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if (! $f) {
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$feed->{message}=XML::Feed->errstr;
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$feed->{error}=1;
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debug($feed->{message});
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next;
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}
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foreach my $entry ($f->entries) {
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add_page(
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feed => $feed,
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copyright => $f->copyright,
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title => defined $entry->title ? decode_entities($entry->title) : "untitled",
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link => $entry->link,
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content => defined $entry->content->body ? $entry->content->body : "",
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guid => defined $entry->id ? $entry->id : time."_".$feed->{name},
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ctime => $entry->issued ? ($entry->issued->epoch || time) : time,
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);
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}
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}
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} #}}}
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sub add_page (@) { #{{{
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my %params=@_;
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my $feed=$params{feed};
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my $guid={};
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my $mtime;
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if (exists $guids{$params{guid}}) {
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# updating an existing post
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$guid=$guids{$params{guid}};
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return if $guid->{expired};
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}
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else {
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# new post
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$guid->{guid}=$params{guid};
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$guids{$params{guid}}=$guid;
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$mtime=$params{ctime};
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$feed->{numposts}++;
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$feed->{newposts}++;
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# assign it an unused page
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my $page=IkiWiki::titlepage($params{title});
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# escape slashes and periods in title so it doesn't specify
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# directory name or trigger ".." disallowing code.
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$page=~s!([/.])!"__".ord($1)."__"!eg;
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$page=$feed->{dir}."/".$page;
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($page)=$page=~/$config{wiki_file_regexp}/;
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if (! defined $page || ! length $page) {
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$page=$feed->{dir}."/item";
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}
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my $c="";
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while (exists $IkiWiki::pagecase{lc $page.$c} ||
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-e pagefile($page.$c)) {
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$c++
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}
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# Make sure that the file name isn't too long.
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# NB: This doesn't check for path length limits.
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my $max=POSIX::pathconf($config{srcdir}, &POSIX::_PC_NAME_MAX);
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if (defined $max && length(htmlfn($page)) >= $max) {
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$c="";
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$page=$feed->{dir}."/item";
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while (exists $IkiWiki::pagecase{lc $page.$c} ||
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-e pagefile($page.$c)) {
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$c++
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}
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}
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$guid->{page}=$page;
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debug(sprintf(gettext("creating new page %s"), $page));
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}
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$guid->{feed}=$feed->{name};
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# To write or not to write? Need to avoid writing unchanged pages
|
|
# to avoid unneccessary rebuilding. The mtime from rss cannot be
|
|
# trusted; let's use a digest.
|
|
eval q{use Digest::MD5 'md5_hex'};
|
|
error($@) if $@;
|
|
require Encode;
|
|
my $digest=md5_hex(Encode::encode_utf8($params{content}));
|
|
return unless ! exists $guid->{md5} || $guid->{md5} ne $digest || $config{rebuild};
|
|
$guid->{md5}=$digest;
|
|
|
|
# Create the page.
|
|
my $template=template($feed->{template}, blind_cache => 1);
|
|
$template->param(title => $params{title})
|
|
if defined $params{title} && length($params{title});
|
|
$template->param(content => htmlescape(htmlabs($params{content}, $feed->{feedurl})));
|
|
$template->param(name => $feed->{name});
|
|
$template->param(url => $feed->{url});
|
|
$template->param(copyright => $params{copyright})
|
|
if defined $params{copyright} && length $params{copyright};
|
|
$template->param(permalink => urlabs($params{link}, $feed->{feedurl}))
|
|
if defined $params{link};
|
|
if (ref $feed->{tags}) {
|
|
$template->param(tags => [map { tag => $_ }, @{$feed->{tags}}]);
|
|
}
|
|
writefile(htmlfn($guid->{page}), $config{srcdir},
|
|
$template->output);
|
|
|
|
# Set the mtime, this lets the build process get the right creation
|
|
# time on record for the new page.
|
|
utime $mtime, $mtime, pagefile($guid->{page})
|
|
if defined $mtime && $mtime <= time;
|
|
} #}}}
|
|
|
|
sub htmlescape ($) { #{{{
|
|
# escape accidental wikilinks and preprocessor stuff
|
|
my $html=shift;
|
|
$html=~s/(?<!\\)\[\[/\\\[\[/g;
|
|
return $html;
|
|
} #}}}
|
|
|
|
sub urlabs ($$) { #{{{
|
|
my $url=shift;
|
|
my $urlbase=shift;
|
|
|
|
URI->new_abs($url, $urlbase)->as_string;
|
|
} #}}}
|
|
|
|
sub htmlabs ($$) { #{{{
|
|
# Convert links in html from relative to absolute.
|
|
# Note that this is a heuristic, which is not specified by the rss
|
|
# spec and may not be right for all feeds. Also, see Debian
|
|
# bug #381359.
|
|
my $html=shift;
|
|
my $urlbase=shift;
|
|
|
|
my $ret="";
|
|
my $p = HTML::Parser->new(api_version => 3);
|
|
$p->handler(default => sub { $ret.=join("", @_) }, "text");
|
|
$p->handler(start => sub {
|
|
my ($tagname, $pos, $text) = @_;
|
|
if (ref $HTML::Tagset::linkElements{$tagname}) {
|
|
while (4 <= @$pos) {
|
|
# use attribute sets from right to left
|
|
# to avoid invalidating the offsets
|
|
# when replacing the values
|
|
my($k_offset, $k_len, $v_offset, $v_len) =
|
|
splice(@$pos, -4);
|
|
my $attrname = lc(substr($text, $k_offset, $k_len));
|
|
next unless grep { $_ eq $attrname } @{$HTML::Tagset::linkElements{$tagname}};
|
|
next unless $v_offset; # 0 v_offset means no value
|
|
my $v = substr($text, $v_offset, $v_len);
|
|
$v =~ s/^([\'\"])(.*)\1$/$2/;
|
|
my $new_v=urlabs($v, $urlbase);
|
|
$new_v =~ s/\"/"/g; # since we quote with ""
|
|
substr($text, $v_offset, $v_len) = qq("$new_v");
|
|
}
|
|
}
|
|
$ret.=$text;
|
|
}, "tagname, tokenpos, text");
|
|
$p->parse($html);
|
|
$p->eof;
|
|
|
|
return $ret;
|
|
} #}}}
|
|
|
|
sub pagefile ($) { #{{{
|
|
my $page=shift;
|
|
|
|
return "$config{srcdir}/".htmlfn($page);
|
|
} #}}}
|
|
|
|
sub htmlfn ($) { #{{{
|
|
return shift().".".($config{aggregateinternal} ? "_" : "").$config{htmlext};
|
|
} #}}}
|
|
|
|
my $aggregatelock;
|
|
|
|
sub lockaggregate () { #{{{
|
|
# Take an exclusive lock to prevent multiple concurrent aggregators.
|
|
# Returns true if the lock was aquired.
|
|
if (! -d $config{wikistatedir}) {
|
|
mkdir($config{wikistatedir});
|
|
}
|
|
open($aggregatelock, '>', "$config{wikistatedir}/aggregatelock") ||
|
|
error ("cannot open to $config{wikistatedir}/aggregatelock: $!");
|
|
if (! flock($aggregatelock, 2 | 4)) { # LOCK_EX | LOCK_NB
|
|
close($aggregatelock) || error("failed closing aggregatelock: $!");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
} #}}}
|
|
|
|
sub unlockaggregate () { #{{{
|
|
return close($aggregatelock) if $aggregatelock;
|
|
return;
|
|
} #}}}
|
|
|
|
1
|