763 lines
20 KiB
Perl
763 lines
20 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 3.00;
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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 => "getsetup", id => "aggregate", call => \&getsetup);
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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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hook(type => "htmlize", id => "_aggregated", call => \&htmlize);
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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 getsetup () {
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return
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plugin => {
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safe => 1,
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rebuild => undef,
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},
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aggregateinternal => {
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type => "boolean",
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example => 1,
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description => "enable aggregation to internal pages?",
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safe => 0, # enabling needs manual transition
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rebuild => 0,
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},
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aggregate_webtrigger => {
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type => "boolean",
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example => 0,
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description => "allow aggregation to be triggered via the web?",
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safe => 1,
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rebuild => 0,
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},
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}
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sub checkconfig () {
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if (! defined $config{aggregateinternal}) {
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$config{aggregateinternal}=1;
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}
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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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# Pages with extension _aggregated have plain html markup, pass through.
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sub htmlize (@) {
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my %params=@_;
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return $params{content};
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}
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# Used by ikiwiki-transition aggregateinternal.
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sub migrate_to_internal {
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if (! lockaggregate()) {
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error("an aggregation process is currently running");
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}
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IkiWiki::lockwiki();
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loadstate();
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$config{verbose}=1;
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foreach my $data (values %guids) {
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next unless $data->{page};
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next if $data->{expired};
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$config{aggregateinternal} = 0;
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my $oldname = "$config{srcdir}/".htmlfn($data->{page});
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my $oldoutput = $config{destdir}."/".IkiWiki::htmlpage($data->{page});
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$config{aggregateinternal} = 1;
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my $newname = "$config{srcdir}/".htmlfn($data->{page});
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debug "moving $oldname -> $newname";
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if (-e $newname) {
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if (-e $oldname) {
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error("$newname already exists");
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}
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else {
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debug("already renamed to $newname?");
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}
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}
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elsif (-e $oldname) {
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rename($oldname, $newname) || error("$!");
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}
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else {
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debug("$oldname not found");
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}
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if (-e $oldoutput) {
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require IkiWiki::Render;
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debug("removing output file $oldoutput");
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IkiWiki::prune($oldoutput);
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}
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}
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savestate();
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IkiWiki::unlockwiki;
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unlockaggregate();
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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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return $needsbuild;
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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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error 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} : $params{page}."/".titlepage($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->{lasttry}=$feed->{lastupdate} unless defined $feed->{lasttry};
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$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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if defined $data->{$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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my $timestamp=undef;
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foreach my $feed (keys %feeds) {
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my $t=$feeds{$feed}->{lastupdate}+$feeds{$feed}->{updateinterval};
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if (! defined $timestamp || $timestamp > $t) {
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$timestamp=$t;
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}
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}
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$newfile=~s/\.new$/time/;
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open (OUT, ">", $newfile) || error("open $newfile: $!", $cleanup);
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if (defined $timestamp) {
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print OUT $timestamp."\n";
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}
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close OUT || error("save $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 "$config{srcdir}/".htmlfn($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 $guid->{page}) {
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unlink "$config{srcdir}/".htmlfn($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 $field (qw{message lastupdate lasttry
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numposts newposts error}) {
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$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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# Guids have a few fields that may be updated 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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else {
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foreach my $field (qw{md5}) {
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$guids{$guid}->{$field}=$myguids{$guid}->{$field};
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}
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}
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}
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}
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sub clearstate () {
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%feeds=();
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%guids=();
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$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{$b->{page}} || 0) <=> ($IkiWiki::pagectime{$a->{page}} || 0) }
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grep { exists $_->{page} && $_->{feed} eq $feed->{name} }
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values %guids) {
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if ($feed->{expireage}) {
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my $days_old = (time - ($IkiWiki::pagectime{$item->{page}} || 0)) / 60 / 60 / 24;
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if ($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->{lasttry}=time;
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$feed->{newposts}=0;
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$feed->{message}=sprintf(gettext("last checked %s"),
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displaytime($feed->{lasttry}));
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$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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# lastupdate is only set if we were able to contact the server
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$feed->{lastupdate}=$feed->{lasttry};
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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
|
|
# feed to ascii to try to work around.
|
|
$feed->{message}.=" ".sprintf(gettext("(invalid UTF-8 stripped from feed)"));
|
|
$f=eval {
|
|
$content=Encode::decode_utf8($content, 0);
|
|
XML::Feed->parse(\$content)
|
|
};
|
|
}
|
|
if ($@) {
|
|
# Another possibility is badly escaped entities.
|
|
$feed->{message}.=" ".sprintf(gettext("(feed entities escaped)"));
|
|
$content=~s/\&(?!amp)(\w+);/&$1;/g;
|
|
$f=eval {
|
|
$content=Encode::decode_utf8($content, 0);
|
|
XML::Feed->parse(\$content)
|
|
};
|
|
}
|
|
if ($@) {
|
|
$feed->{message}=gettext("feed crashed XML::Feed!")." ($@)";
|
|
$feed->{error}=1;
|
|
debug($feed->{message});
|
|
next;
|
|
}
|
|
if (! $f) {
|
|
$feed->{message}=XML::Feed->errstr;
|
|
$feed->{error}=1;
|
|
debug($feed->{message});
|
|
next;
|
|
}
|
|
|
|
foreach my $entry ($f->entries) {
|
|
# XML::Feed doesn't work around XML::Atom's bizarre
|
|
# API, so we will. Real unicode strings? Yes please.
|
|
# See [[bugs/Aggregated_Atom_feeds_are_double-encoded]]
|
|
local $XML::Atom::ForceUnicode = 1;
|
|
|
|
my $c=$entry->content;
|
|
# atom feeds may have no content, only a summary
|
|
if (! defined $c && ref $entry->summary) {
|
|
$c=$entry->summary;
|
|
}
|
|
|
|
add_page(
|
|
feed => $feed,
|
|
copyright => $f->copyright,
|
|
title => defined $entry->title ? decode_entities($entry->title) : "untitled",
|
|
link => $entry->link,
|
|
content => (defined $c && defined $c->body) ? $c->body : "",
|
|
guid => defined $entry->id ? $entry->id : time."_".$feed->{name},
|
|
ctime => $entry->issued ? ($entry->issued->epoch || time) : time,
|
|
base => (defined $c && $c->can("base")) ? $c->base : undef,
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
sub add_page (@) {
|
|
my %params=@_;
|
|
|
|
my $feed=$params{feed};
|
|
my $guid={};
|
|
my $mtime;
|
|
if (exists $guids{$params{guid}}) {
|
|
# updating an existing post
|
|
$guid=$guids{$params{guid}};
|
|
return if $guid->{expired};
|
|
}
|
|
else {
|
|
# new post
|
|
$guid->{guid}=$params{guid};
|
|
$guids{$params{guid}}=$guid;
|
|
$mtime=$params{ctime};
|
|
$feed->{numposts}++;
|
|
$feed->{newposts}++;
|
|
|
|
# assign it an unused page
|
|
my $page=titlepage($params{title});
|
|
# escape slashes and periods in title so it doesn't specify
|
|
# directory name or trigger ".." disallowing code.
|
|
$page=~s!([/.])!"__".ord($1)."__"!eg;
|
|
$page=$feed->{dir}."/".$page;
|
|
($page)=$page=~/$config{wiki_file_regexp}/;
|
|
if (! defined $page || ! length $page) {
|
|
$page=$feed->{dir}."/item";
|
|
}
|
|
my $c="";
|
|
while (exists $IkiWiki::pagecase{lc $page.$c} ||
|
|
-e "$config{srcdir}/".htmlfn($page.$c)) {
|
|
$c++
|
|
}
|
|
|
|
# Make sure that the file name isn't too long.
|
|
# NB: This doesn't check for path length limits.
|
|
my $max=POSIX::pathconf($config{srcdir}, &POSIX::_PC_NAME_MAX);
|
|
if (defined $max && length(htmlfn($page)) >= $max) {
|
|
$c="";
|
|
$page=$feed->{dir}."/item";
|
|
while (exists $IkiWiki::pagecase{lc $page.$c} ||
|
|
-e "$config{srcdir}/".htmlfn($page.$c)) {
|
|
$c++
|
|
}
|
|
}
|
|
|
|
$guid->{page}=$page;
|
|
debug(sprintf(gettext("creating new page %s"), $page));
|
|
}
|
|
$guid->{feed}=$feed->{name};
|
|
|
|
# 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;
|
|
eval {
|
|
$template=template($feed->{template}, blind_cache => 1);
|
|
};
|
|
if ($@) {
|
|
print STDERR gettext("failed to process template:")." $@";
|
|
return;
|
|
}
|
|
$template->param(title => $params{title})
|
|
if defined $params{title} && length($params{title});
|
|
$template->param(content => wikiescape(htmlabs($params{content},
|
|
defined $params{base} ? $params{base} : $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);
|
|
|
|
if (defined $mtime && $mtime <= time) {
|
|
# Set the mtime, this lets the build process get the right
|
|
# creation time on record for the new page.
|
|
utime $mtime, $mtime, "$config{srcdir}/".htmlfn($guid->{page});
|
|
# Store it in pagectime for expiry code to use also.
|
|
$IkiWiki::pagectime{$guid->{page}}=$mtime
|
|
unless exists $IkiWiki::pagectime{$guid->{page}};
|
|
}
|
|
else {
|
|
# Dummy value for expiry code.
|
|
$IkiWiki::pagectime{$guid->{page}}=time
|
|
unless exists $IkiWiki::pagectime{$guid->{page}};
|
|
}
|
|
}
|
|
|
|
sub wikiescape ($) {
|
|
# escape accidental wikilinks and preprocessor stuff
|
|
return encode_entities(shift, '\[\]');
|
|
}
|
|
|
|
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 $ret;
|
|
}
|
|
|
|
sub htmlfn ($) {
|
|
return shift().".".($config{aggregateinternal} ? "_aggregated" : $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
|