ikiwiki/IkiWiki/Plugin/aggregate.pm

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#!/usr/bin/perl
# Feed aggregation plugin.
package IkiWiki::Plugin::aggregate;
use warnings;
use strict;
use IkiWiki 3.00;
use HTML::Parser;
use HTML::Tagset;
use HTML::Entities;
use open qw{:utf8 :std};
my %feeds;
my %guids;
sub import {
hook(type => "getopt", id => "aggregate", call => \&getopt);
hook(type => "getsetup", id => "aggregate", call => \&getsetup);
hook(type => "checkconfig", id => "aggregate", call => \&checkconfig);
hook(type => "needsbuild", id => "aggregate", call => \&needsbuild);
hook(type => "preprocess", id => "aggregate", call => \&preprocess);
hook(type => "delete", id => "aggregate", call => \&delete);
hook(type => "savestate", id => "aggregate", call => \&savestate);
hook(type => "htmlize", id => "_aggregated", call => \&htmlize);
if (exists $config{aggregate_webtrigger} && $config{aggregate_webtrigger}) {
hook(type => "cgi", id => "aggregate", call => \&cgi);
}
}
sub getopt () {
eval q{use Getopt::Long};
error($@) if $@;
Getopt::Long::Configure('pass_through');
GetOptions(
"aggregate" => \$config{aggregate},
"aggregateinternal!" => \$config{aggregateinternal},
);
}
sub getsetup () {
return
plugin => {
safe => 1,
rebuild => undef,
},
aggregateinternal => {
type => "boolean",
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example => 1,
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description => "enable aggregation to internal pages?",
safe => 0, # enabling needs manual transition
rebuild => 0,
},
aggregate_webtrigger => {
type => "boolean",
example => 0,
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description => "allow aggregation to be triggered via the web?",
safe => 1,
rebuild => 0,
},
}
sub checkconfig () {
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if (! defined $config{aggregateinternal}) {
$config{aggregateinternal}=1;
}
if ($config{aggregate} && ! ($config{post_commit} &&
IkiWiki::commit_hook_enabled())) {
launchaggregation();
}
}
sub cgi ($) {
my $cgi=shift;
if (defined $cgi->param('do') &&
$cgi->param("do") eq "aggregate_webtrigger") {
$|=1;
print "Content-Type: text/plain\n\n";
$config{cgi}=0;
$config{verbose}=1;
$config{syslog}=0;
print gettext("Aggregation triggered via web.")."\n\n";
if (launchaggregation()) {
IkiWiki::lockwiki();
IkiWiki::loadindex();
require IkiWiki::Render;
IkiWiki::refresh();
IkiWiki::saveindex();
}
else {
print gettext("Nothing to do right now, all feeds are up-to-date!")."\n";
}
exit 0;
}
}
sub launchaggregation () {
# See if any feeds need aggregation.
loadstate();
my @feeds=needsaggregate();
return unless @feeds;
if (! lockaggregate()) {
debug("an aggregation process is already running");
return;
}
# force a later rebuild of source pages
$IkiWiki::forcerebuild{$_->{sourcepage}}=1
foreach @feeds;
# Fork a child process to handle the aggregation.
# The parent process will then handle building the
# result. This avoids messy code to clear state
# accumulated while aggregating.
defined(my $pid = fork) or error("Can't fork: $!");
if (! $pid) {
IkiWiki::loadindex();
# Aggregation happens without the main wiki lock
# being held. This allows editing pages etc while
# aggregation is running.
aggregate(@feeds);
IkiWiki::lockwiki;
# Merge changes, since aggregation state may have
# changed on disk while the aggregation was happening.
mergestate();
expire();
savestate();
IkiWiki::unlockwiki;
exit 0;
}
waitpid($pid,0);
if ($?) {
error "aggregation failed with code $?";
}
clearstate();
unlockaggregate();
return 1;
}
# Pages with extension _aggregated have plain html markup, pass through.
sub htmlize (@) {
my %params=@_;
return $params{content};
}
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# Used by ikiwiki-transition aggregateinternal.
sub migrate_to_internal {
if (! lockaggregate()) {
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error("an aggregation process is currently running");
}
IkiWiki::lockwiki();
loadstate();
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$config{verbose}=1;
foreach my $data (values %guids) {
next unless $data->{page};
next if $data->{expired};
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$config{aggregateinternal} = 0;
my $oldname = "$config{srcdir}/".htmlfn($data->{page});
if (! -e $oldname) {
$oldname = $IkiWiki::Plugin::transient::transientdir."/".htmlfn($data->{page});
}
my $oldoutput = $config{destdir}."/".IkiWiki::htmlpage($data->{page});
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$config{aggregateinternal} = 1;
my $newname = $IkiWiki::Plugin::transient::transientdir."/".htmlfn($data->{page});
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debug "moving $oldname -> $newname";
if (-e $newname) {
if (-e $oldname) {
error("$newname already exists");
}
else {
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debug("already renamed to $newname?");
}
}
elsif (-e $oldname) {
rename($oldname, $newname) || error("$!");
}
else {
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debug("$oldname not found");
}
if (-e $oldoutput) {
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require IkiWiki::Render;
debug("removing output file $oldoutput");
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IkiWiki::prune($oldoutput);
}
}
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savestate();
IkiWiki::unlockwiki;
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unlockaggregate();
}
sub needsbuild (@) {
my $needsbuild=shift;
loadstate();
foreach my $feed (values %feeds) {
if (exists $pagesources{$feed->{sourcepage}} &&
grep { $_ eq $pagesources{$feed->{sourcepage}} } @$needsbuild) {
# Mark all feeds originating on this page as
# not yet seen; preprocess will unmark those that
# still exist.
markunseen($feed->{sourcepage});
}
}
return $needsbuild;
}
sub preprocess (@) {
my %params=@_;
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foreach my $required (qw{name url}) {
if (! exists $params{$required}) {
error sprintf(gettext("missing %s parameter"), $required)
}
}
my $feed={};
my $name=$params{name};
if (exists $feeds{$name}) {
$feed=$feeds{$name};
}
else {
$feeds{$name}=$feed;
}
$feed->{name}=$name;
$feed->{sourcepage}=$params{page};
$feed->{url}=$params{url};
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my $dir=exists $params{dir} ? $params{dir} : $params{page}."/".titlepage($params{name});
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$dir=~s/^\/+//;
($dir)=$dir=~/$config{wiki_file_regexp}/;
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$feed->{dir}=$dir;
$feed->{feedurl}=defined $params{feedurl} ? $params{feedurl} : "";
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$feed->{updateinterval}=defined $params{updateinterval} ? $params{updateinterval} * 60 : 15 * 60;
$feed->{expireage}=defined $params{expireage} ? $params{expireage} : 0;
$feed->{expirecount}=defined $params{expirecount} ? $params{expirecount} : 0;
if (exists $params{template}) {
$params{template}=~s/[^-_a-zA-Z0-9]+//g;
}
else {
$params{template} = "aggregatepost"
}
$feed->{template}=$params{template} . ".tmpl";
delete $feed->{unseen};
$feed->{lastupdate}=0 unless defined $feed->{lastupdate};
$feed->{lasttry}=$feed->{lastupdate} unless defined $feed->{lasttry};
$feed->{numposts}=0 unless defined $feed->{numposts};
$feed->{newposts}=0 unless defined $feed->{newposts};
$feed->{message}=gettext("new feed") unless defined $feed->{message};
$feed->{error}=0 unless defined $feed->{error};
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$feed->{tags}=[];
while (@_) {
my $key=shift;
my $value=shift;
if ($key eq 'tag') {
push @{$feed->{tags}}, $value;
}
}
return "<a href=\"".$feed->{url}."\">".$feed->{name}."</a>: ".
($feed->{error} ? "<em>" : "").$feed->{message}.
($feed->{error} ? "</em>" : "").
" (".$feed->{numposts}." ".gettext("posts").
($feed->{newposts} ? "; ".$feed->{newposts}.
" ".gettext("new") : "").
")";
}
sub delete (@) {
my @files=@_;
# Remove feed data for removed pages.
foreach my $file (@files) {
my $page=pagename($file);
markunseen($page);
}
}
sub markunseen ($) {
my $page=shift;
foreach my $id (keys %feeds) {
if ($feeds{$id}->{sourcepage} eq $page) {
$feeds{$id}->{unseen}=1;
}
}
}
my $state_loaded=0;
sub loadstate () {
return if $state_loaded;
$state_loaded=1;
if (-e "$config{wikistatedir}/aggregate") {
open(IN, "<", "$config{wikistatedir}/aggregate") ||
die "$config{wikistatedir}/aggregate: $!";
while (<IN>) {
$_=IkiWiki::possibly_foolish_untaint($_);
chomp;
my $data={};
foreach my $i (split(/ /, $_)) {
my ($field, $val)=split(/=/, $i, 2);
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if ($field eq "name" || $field eq "feed" ||
$field eq "guid" || $field eq "message") {
$data->{$field}=decode_entities($val, " \t\n");
}
elsif ($field eq "tag") {
push @{$data->{tags}}, $val;
}
else {
$data->{$field}=$val;
}
}
if (exists $data->{name}) {
$feeds{$data->{name}}=$data;
}
elsif (exists $data->{guid}) {
$guids{$data->{guid}}=$data;
}
}
close IN;
}
}
sub savestate () {
return unless $state_loaded;
garbage_collect();
my $newfile="$config{wikistatedir}/aggregate.new";
my $cleanup = sub { unlink($newfile) };
open (OUT, ">", $newfile) || error("open $newfile: $!", $cleanup);
foreach my $data (values %feeds, values %guids) {
my @line;
foreach my $field (keys %$data) {
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if ($field eq "name" || $field eq "feed" ||
$field eq "guid" || $field eq "message") {
push @line, "$field=".encode_entities($data->{$field}, " \t\n");
}
elsif ($field eq "tags") {
push @line, "tag=$_" foreach @{$data->{tags}};
}
else {
push @line, "$field=".$data->{$field}
if defined $data->{$field};
}
}
print OUT join(" ", @line)."\n" || error("write $newfile: $!", $cleanup);
}
close OUT || error("save $newfile: $!", $cleanup);
rename($newfile, "$config{wikistatedir}/aggregate") ||
error("rename $newfile: $!", $cleanup);
my $timestamp=undef;
foreach my $feed (keys %feeds) {
my $t=$feeds{$feed}->{lastupdate}+$feeds{$feed}->{updateinterval};
if (! defined $timestamp || $timestamp > $t) {
$timestamp=$t;
}
}
$newfile=~s/\.new$/time/;
open (OUT, ">", $newfile) || error("open $newfile: $!", $cleanup);
if (defined $timestamp) {
print OUT $timestamp."\n";
}
close OUT || error("save $newfile: $!", $cleanup);
}
sub garbage_collect () {
foreach my $name (keys %feeds) {
# remove any feeds that were not seen while building the pages
# that used to contain them
if ($feeds{$name}->{unseen}) {
delete $feeds{$name};
}
}
foreach my $guid (values %guids) {
# any guid whose feed is gone should be removed
if (! exists $feeds{$guid->{feed}}) {
if (exists $guid->{page}) {
unlink $IkiWiki::Plugin::transient::transientdir."/".htmlfn($guid->{page})
|| unlink "$config{srcdir}/".htmlfn($guid->{page});
}
delete $guids{$guid->{guid}};
}
# handle expired guids
elsif ($guid->{expired} && exists $guid->{page}) {
unlink "$config{srcdir}/".htmlfn($guid->{page});
unlink $IkiWiki::Plugin::transient::transientdir."/".htmlfn($guid->{page});
delete $guid->{page};
delete $guid->{md5};
}
}
}
sub mergestate () {
# Load the current state in from disk, and merge into it
# values from the state in memory that might have changed
# during aggregation.
my %myfeeds=%feeds;
my %myguids=%guids;
clearstate();
loadstate();
# All that can change in feed state during aggregation is a few
# fields.
foreach my $name (keys %myfeeds) {
if (exists $feeds{$name}) {
foreach my $field (qw{message lastupdate lasttry
numposts newposts error}) {
$feeds{$name}->{$field}=$myfeeds{$name}->{$field};
}
}
}
# New guids can be created during aggregation.
# Guids have a few fields that may be updated during aggregation.
# It's also possible that guids were removed from the on-disk state
# while the aggregation was in process. That would only happen if
# their feed was also removed, so any removed guids added back here
# will be garbage collected later.
foreach my $guid (keys %myguids) {
if (! exists $guids{$guid}) {
$guids{$guid}=$myguids{$guid};
}
else {
foreach my $field (qw{md5}) {
$guids{$guid}->{$field}=$myguids{$guid}->{$field};
}
}
}
}
sub clearstate () {
%feeds=();
%guids=();
$state_loaded=0;
}
sub expire () {
foreach my $feed (values %feeds) {
next unless $feed->{expireage} || $feed->{expirecount};
my $count=0;
my %seen;
foreach my $item (sort { ($IkiWiki::pagectime{$b->{page}} || 0) <=> ($IkiWiki::pagectime{$a->{page}} || 0) }
grep { exists $_->{page} && $_->{feed} eq $feed->{name} }
values %guids) {
if ($feed->{expireage}) {
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my $days_old = (time - ($IkiWiki::pagectime{$item->{page}} || 0)) / 60 / 60 / 24;
if ($days_old > $feed->{expireage}) {
debug(sprintf(gettext("expiring %s (%s days old)"),
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$item->{page}, int($days_old)));
$item->{expired}=1;
}
}
elsif ($feed->{expirecount} &&
$count >= $feed->{expirecount}) {
debug(sprintf(gettext("expiring %s"), $item->{page}));
$item->{expired}=1;
}
else {
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if (! $seen{$item->{page}}) {
$seen{$item->{page}}=1;
$count++;
}
}
}
}
}
sub needsaggregate () {
return values %feeds if $config{rebuild};
return grep { time - $_->{lastupdate} >= $_->{updateinterval} } values %feeds;
}
sub aggregate (@) {
eval q{use XML::Feed};
error($@) if $@;
eval q{use URI::Fetch};
error($@) if $@;
foreach my $feed (@_) {
$feed->{lasttry}=time;
$feed->{newposts}=0;
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$feed->{message}=sprintf(gettext("last checked %s"),
displaytime($feed->{lasttry}));
$feed->{error}=0;
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debug(sprintf(gettext("checking feed %s ..."), $feed->{name}));
if (! length $feed->{feedurl}) {
my @urls=XML::Feed->find_feeds($feed->{url});
if (! @urls) {
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$feed->{message}=sprintf(gettext("could not find feed at %s"), $feed->{url});
$feed->{error}=1;
debug($feed->{message});
next;
}
$feed->{feedurl}=pop @urls;
}
my $res=URI::Fetch->fetch($feed->{feedurl});
if (! $res) {
$feed->{message}=URI::Fetch->errstr;
$feed->{error}=1;
debug($feed->{message});
next;
}
# lastupdate is only set if we were able to contact the server
$feed->{lastupdate}=$feed->{lasttry};
if ($res->status == URI::Fetch::URI_GONE()) {
$feed->{message}=gettext("feed not found");
$feed->{error}=1;
debug($feed->{message});
next;
}
my $content=$res->content;
my $f=eval{XML::Feed->parse(\$content)};
if ($@) {
# One common cause of XML::Feed crashing is a feed
# that contains invalid UTF-8 sequences. Convert
# feed to ascii to try to work around.
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$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+);/&amp;$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,
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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=@_;
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my $feed=$params{feed};
my $guid={};
my $mtime;
if (exists $guids{$params{guid}}) {
# updating an existing post
$guid=$guids{$params{guid}};
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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
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my $page=titlepage($params{title});
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# escape slashes and periods in title so it doesn't specify
# directory name or trigger ".." disallowing code.
$page=~s!([/.])!"__".ord($1)."__"!eg;
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$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 $IkiWiki::Plugin::transient::transientdir."/".htmlfn($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) {
$c="";
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$page=$feed->{dir}."/item";
while (exists $IkiWiki::pagecase{lc $page.$c} ||
-e $IkiWiki::Plugin::transient::transientdir."/".htmlfn($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 $@;
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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 => $feed->{name});
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$template->param(url => $feed->{url});
$template->param(copyright => $params{copyright})
if defined $params{copyright} && length $params{copyright};
$template->param(permalink => IkiWiki::urlabs($params{link}, $feed->{feedurl}))
if defined $params{link};
if (ref $feed->{tags}) {
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$template->param(tags => [map { tag => $_ }, @{$feed->{tags}}]);
}
writefile(htmlfn($guid->{page}),
$IkiWiki::Plugin::transient::transientdir, $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,
$IkiWiki::Plugin::transient::transientdir."/".htmlfn($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 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
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# 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 $new_v=IkiWiki::urlabs($v, $urlbase);
$new_v =~ s/\"/&quot;/g; # since we quote with ""
substr($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});
}
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my $aggregatelock;
sub lockaggregate () {
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# 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: $!");
return 0;
}
return 1;
}
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sub unlockaggregate () {
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return close($aggregatelock) if $aggregatelock;
return;
}
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1