ikiwiki/IkiWiki/Plugin/aggregate.pm

439 lines
12 KiB
Perl

#!/usr/bin/perl
# Blog aggregation plugin.
package IkiWiki::Plugin::aggregate;
use warnings;
use strict;
use IkiWiki;
use HTML::Entities;
use HTML::Parser;
use HTML::Tagset;
use URI;
use open qw{:utf8 :std};
my %feeds;
my %guids;
sub import { #{{{
hook(type => "getopt", id => "aggregate", call => \&getopt);
hook(type => "checkconfig", id => "aggregate", call => \&checkconfig);
hook(type => "filter", id => "aggregate", call => \&filter);
hook(type => "preprocess", id => "aggregate", call => \&preprocess);
hook(type => "delete", id => "aggregate", call => \&delete);
hook(type => "savestate", id => "aggregate", call => \&savestate);
} # }}}
sub getopt () { #{{{
eval q{use Getopt::Long};
error($@) if $@;
Getopt::Long::Configure('pass_through');
GetOptions("aggregate" => \$config{aggregate});
} #}}}
sub checkconfig () { #{{{
my $nolock=($config{post_commit} && ! IkiWiki::commit_hook_enabled());
IkiWiki::lockwiki() unless $nolock;
loadstate();
if ($config{aggregate} && ! $nolock) {
IkiWiki::loadindex();
aggregate();
expire();
savestate();
}
IkiWiki::unlockwiki() unless $nolock;
} #}}}
sub filter (@) { #{{{
my %params=@_;
my $page=$params{page};
# Mark all feeds originating on this page as removable;
# preprocess will unmark those that still exist.
remove_feeds($page);
return $params{content};
} # }}}
sub preprocess (@) { #{{{
my %params=@_;
foreach my $required (qw{name url}) {
if (! exists $params{$required}) {
return "[[aggregate ".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};
my $dir=exists $params{dir} ? $params{dir} : $params{page}."/".IkiWiki::titlepage($params{name});
$dir=~s/^\/+//;
($dir)=$dir=~/$config{wiki_file_regexp}/;
$feed->{dir}=$dir;
$feed->{feedurl}=defined $params{feedurl} ? $params{feedurl} : "";
$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;
delete $feed->{remove};
delete $feed->{expired};
$feed->{lastupdate}=0 unless defined $feed->{lastupdate};
$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};
$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);
remove_feeds($page);
}
} #}}}
sub loadstate () { #{{{
if (-e "$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(/=/, $i, 2);
if ($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}}=$data;
}
}
close IN;
}
} #}}}
sub savestate () { #{{{
eval q{use HTML::Entities};
error($@) if $@;
my $newfile="$config{wikistatedir}/aggregate.new";
# TODO: This cleanup function could use improvement. Any newly
# aggregated files are left behind unrecorded, and should be deleted.
my $cleanup = sub { unlink($newfile) };
open (OUT, ">$newfile") || error("open $newfile: $!", $cleanup);
foreach my $data (values %feeds, values %guids) {
if ($data->{remove}) {
if ($data->{name}) {
foreach my $guid (values %guids) {
if ($guid->{feed} eq $data->{name}) {
$guid->{remove}=1;
}
}
}
else {
unlink pagefile($data->{page});
}
next;
}
elsif ($data->{expired} && exists $data->{page}) {
unlink pagefile($data->{page});
delete $data->{page};
delete $data->{md5};
}
my @line;
foreach my $field (keys %$data) {
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};
}
}
print OUT join(" ", @line)."\n" || error("write $newfile: $!", $cleanup);
}
close OUT || error("save $newfile: $!", $cleanup);
rename($newfile, "$config{wikistatedir}/aggregate") ||
error("rename $newfile: $!", $cleanup);
} #}}}
sub expire () { #{{{
foreach my $feed (values %feeds) {
next unless $feed->{expireage} || $feed->{expirecount};
my $count=0;
foreach my $item (sort { $IkiWiki::pagectime{$b->{page}} <=> $IkiWiki::pagectime{$a->{page}} }
grep { exists $_->{page} && $_->{feed} eq $feed->{name} && $IkiWiki::pagectime{$_->{page}} }
values %guids) {
if ($feed->{expireage}) {
my $days_old = (time - $IkiWiki::pagectime{$item->{page}}) / 60 / 60 / 24;
if ($days_old > $feed->{expireage}) {
debug(sprintf(gettext("expiring %s (%s days old)"),
$item->{page}, $days_old));
$item->{expired}=1;
}
}
elsif ($feed->{expirecount} &&
$count >= $feed->{expirecount}) {
debug(sprintf(gettext("expiring %s"), $item->{page}));
$item->{expired}=1;
}
else {
$count++;
}
}
}
} #}}}
sub aggregate () { #{{{
eval q{use XML::Feed};
error($@) if $@;
eval q{use HTML::Entities};
error($@) if $@;
foreach my $feed (values %feeds) {
next unless $config{rebuild} ||
time - $feed->{lastupdate} >= $feed->{updateinterval};
$feed->{lastupdate}=time;
$feed->{newposts}=0;
$IkiWiki::forcerebuild{$feed->{sourcepage}}=1;
debug(sprintf(gettext("checking feed %s ..."), $feed->{name}));
if (! length $feed->{feedurl}) {
my @urls=XML::Feed->find_feeds($feed->{url});
if (! @urls) {
$feed->{message}=sprintf(gettext("could not find feed at %s"), $feed->{feedurl});
$feed->{error}=1;
debug($feed->{message});
next;
}
$feed->{feedurl}=pop @urls;
}
my $f=eval{XML::Feed->parse(URI->new($feed->{feedurl}))};
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) {
add_page(
feed => $feed,
title => defined $entry->title ? decode_entities($entry->title) : "untitled",
link => $entry->link,
content => $entry->content->body,
guid => defined $entry->id ? $entry->id : time."_".$feed->name,
ctime => $entry->issued ? ($entry->issued->epoch || time) : time,
);
}
$feed->{message}=sprintf(gettext("processed ok at %s"),
displaytime($feed->{lastupdate}));
$feed->{error}=0;
}
} #}}}
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 $page=IkiWiki::titlepage($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 pagefile($page.$c)) {
$c++
}
# Make sure that the file name isn't too long.
# NB: This doesn't check for path length limits.
eval q{use POSIX};
my $max=POSIX::pathconf($config{srcdir}, &POSIX::_PC_NAME_MAX);
if (defined $max && length(htmlpage($page)) >= $max) {
$c="";
$page=$feed->{dir}."/item";
while (exists $IkiWiki::pagecase{lc $page.$c} ||
-e pagefile($page.$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=template("aggregatepost.tmpl", 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});
$template->param(permalink => urlabs($params{link}, $feed->{feedurl}))
if defined $params{link};
if (ref $feed->{tags}) {
$template->param(tags => [map { tag => $_ }, @{$feed->{tags}}]);
}
writefile(htmlpage($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 $mtime;
} #}}}
sub htmlescape ($) { #{{{
# 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);
$new_v =~ s/\"/&quot;/g; # since we quote with ""
substr($text, $v_offset, $v_len) = qq("$new_v");
}
}
$ret.=$text;
}, "tagname, tokenpos, text");
$p->parse($html);
$p->eof;
return $ret;
} #}}}
sub remove_feeds () { #{{{
my $page=shift;
my %removed;
foreach my $id (keys %feeds) {
if ($feeds{$id}->{sourcepage} eq $page) {
$feeds{$id}->{remove}=1;
$removed{$id}=1;
}
}
} #}}}
sub pagefile ($) { #{{{
my $page=shift;
return "$config{srcdir}/".htmlpage($page);
} #}}}
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