cherry-pick uri security fix

[git.ikiwiki.info.git] / IkiWiki / Plugin / aggregate.pm

diff --git a/IkiWiki/Plugin/aggregate.pm b/IkiWiki/Plugin/aggregate.pm
index 75e6f31d62dcfe26b86d82558e26474a163d2087..ba40ee6bcb42f57f2f3929db25a5f0fa75aeeb34 100644 (file)
--- a/IkiWiki/Plugin/aggregate.pm
+++ b/IkiWiki/Plugin/aggregate.pm
@@ -4,50 +4,93 @@ package IkiWiki::Plugin::aggregate;
 
 use warnings;
 use strict;
 
 use warnings;
 use strict;

-use IkiWiki;
+use IkiWiki 2.00;
+use HTML::Entities;
+use HTML::Parser;
+use HTML::Tagset;
+use URI;
+use open qw{:utf8 :std};

 
 my %feeds;
 my %guids;
 
 sub import { #{{{
 
 my %feeds;
 my %guids;
 
 sub import { #{{{

-       IkiWiki::hook(type => "getopt", id => "aggregate", 
-               call => \&getopt);
-       IkiWiki::hook(type => "checkconfig", id => "aggregate",
-               call => \&checkconfig);
-       IkiWiki::hook(type => "filter", id => "aggregate", 
-               call => \&filter);
-       IkiWiki::hook(type => "preprocess", id => "aggregate",
-               call => \&preprocess);
-        IkiWiki::hook(type => "delete", id => "aggregate",
-                call => \&delete);
-       IkiWiki::hook(type => "savestate", id => "aggregate",
-               call => \&savestate);
+       hook(type => "getopt", id => "aggregate", call => \&getopt);
+       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);

 } # }}}
 
 sub getopt () { #{{{
         eval q{use Getopt::Long};
 } # }}}
 
 sub getopt () { #{{{
         eval q{use Getopt::Long};

+       error($@) if $@;

         Getopt::Long::Configure('pass_through');
         Getopt::Long::Configure('pass_through');

-        GetOptions("aggregate" => \$IkiWiki::config{aggregate});
+        GetOptions("aggregate" => \$config{aggregate});

 } #}}}
 
 sub checkconfig () { #{{{
 } #}}}
 
 sub checkconfig () { #{{{

-       loadstate();
-       if ($IkiWiki::config{aggregate}) {
-               IkiWiki::loadindex();
-               aggregate();
-               savestate();
+       if ($config{aggregate} && ! ($config{post_commit} && 
+                                    IkiWiki::commit_hook_enabled())) {
+               # 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();

        }
 } #}}}
 
        }
 } #}}}
 

-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);
+sub needsbuild (@) { #{{{
+       my $needsbuild=shift;
+       
+       loadstate();

 
 

-       return $params{content};
+       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});
+               }
+       }

 } # }}}
 
 sub preprocess (@) { #{{{
 } # }}}
 
 sub preprocess (@) { #{{{


@@ -55,7 +98,7 @@ sub preprocess (@) { #{{{
 
        foreach my $required (qw{name url}) {
                if (! exists $params{$required}) {
 
        foreach my $required (qw{name url}) {
                if (! exists $params{$required}) {

-                       return "[[aggregate plugin missing $required parameter]]";
+                       return "[[aggregate ".sprintf(gettext("missing %s parameter"), $required)."]]";

                }
        }
 
                }
        }
 


@@ -70,19 +113,21 @@ sub preprocess (@) { #{{{
        $feed->{name}=$name;
        $feed->{sourcepage}=$params{page};
        $feed->{url}=$params{url};
        $feed->{name}=$name;
        $feed->{sourcepage}=$params{page};
        $feed->{url}=$params{url};

-       my $dir=exists $params{dir} ? $params{dir} : IkiWiki::titlepage($params{name});
+       my $dir=exists $params{dir} ? $params{dir} : $params{page}."/".IkiWiki::titlepage($params{name});

        $dir=~s/^\/+//;
        $dir=~s/^\/+//;

-       ($dir)=$dir=~/$IkiWiki::config{wiki_file_regexp}/;
+       ($dir)=$dir=~/$config{wiki_file_regexp}/;

        $feed->{dir}=$dir;
        $feed->{dir}=$dir;

-       $feed->{feedurl}=defined $params{feedurl} ? $params{feedurl} : $params{url};
+       $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;
        $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->{unseen};

        $feed->{lastupdate}=0 unless defined $feed->{lastupdate};
        $feed->{numposts}=0 unless defined $feed->{numposts};
        $feed->{newposts}=0 unless defined $feed->{newposts};
        $feed->{lastupdate}=0 unless defined $feed->{lastupdate};
        $feed->{numposts}=0 unless defined $feed->{numposts};
        $feed->{newposts}=0 unless defined $feed->{newposts};

-       $feed->{message}="new feed" unless defined $feed->{message};
+       $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;
        while (@_) {
                my $key=shift;
                my $value=shift;


@@ -92,8 +137,12 @@ sub preprocess (@) { #{{{
        }
 
        return "<a href=\"".$feed->{url}."\">".$feed->{name}."</a>: ".
        }
 
        return "<a href=\"".$feed->{url}."\">".$feed->{name}."</a>: ".

-              "<i>".$feed->{message}."</i> (".$feed->{numposts}.
-              " stored posts; ".$feed->{newposts}." new)<br />";
+              ($feed->{error} ? "<em>" : "").$feed->{message}.
+              ($feed->{error} ? "</em>" : "").
+              " (".$feed->{numposts}." ".gettext("posts").
+              ($feed->{newposts} ? "; ".$feed->{newposts}.
+                                   " ".gettext("new") : "").
+              ")";

 } # }}}
 
 sub delete (@) { #{{{
 } # }}}
 
 sub delete (@) { #{{{


@@ -101,23 +150,38 @@ sub delete (@) { #{{{
 
        # Remove feed data for removed pages.
        foreach my $file (@files) {
 
        # Remove feed data for removed pages.
        foreach my $file (@files) {

-               my $page=IkiWiki::pagename($file);
-               remove_feeds($page);
+               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 () { #{{{
 sub loadstate () { #{{{

-       if (-e "$IkiWiki::config{wikistatedir}/aggregate") {
-               open (IN, "$IkiWiki::config{wikistatedir}/aggregate" ||
-                       die "$IkiWiki::config{wikistatedir}/aggregate: $!");
+       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);
                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 "message") {
-                                       $data->{$field}=IkiWiki::pagetitle($val);
+                               if ($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}}, $val;
                                }
                                elsif ($field eq "tag") {
                                        push @{$data->{tags}}, $val;


@@ -140,27 +204,19 @@ sub loadstate () { #{{{
 } #}}}
 
 sub savestate () { #{{{
 } #}}}
 
 sub savestate () { #{{{

-       open (OUT, ">$IkiWiki::config{wikistatedir}/aggregate" ||
-               die "$IkiWiki::config{wikistatedir}/aggregate: $!");
+       return unless $state_loaded;
+       garbage_collect();
+       eval q{use HTML::Entities};
+       error($@) if $@;
+       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) {
        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;
-               }
-

                my @line;
                foreach my $field (keys %$data) {
                my @line;
                foreach my $field (keys %$data) {

-                       if ($field eq "name" || $field eq "message") {
-                               push @line, "$field=".IkiWiki::titlepage($data->{$field});
+                       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 @{$data->{tags}};
                        }
                        elsif ($field eq "tags") {
                                push @line, "tag=$_" foreach @{$data->{tags}};


@@ -169,59 +225,194 @@ sub savestate () { #{{{
                                push @line, "$field=".$data->{$field};
                        }
                }
                                push @line, "$field=".$data->{$field};
                        }
                }

-               print OUT join(" ", @line)."\n";
+               print OUT join(" ", @line)."\n" || error("write $newfile: $!", $cleanup);

        }
        }

-       close OUT;
+       close OUT || error("save $newfile: $!", $cleanup);
+       rename($newfile, "$config{wikistatedir}/aggregate") ||
+               error("rename $newfile: $!", $cleanup);

 } #}}}
 
 } #}}}
 

-sub aggregate () { #{{{
-       eval q{use XML::Feed};
-       die $@ if $@;
-       eval q{use HTML::Entities};
-       die $@ if $@;
+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};
+               }
+       }

 
 

-FEED:  foreach my $feed (values %feeds) {
-               next unless time - $feed->{lastupdate} >= $feed->{updateinterval};
-               $feed->{lastupdate}=time;
-               $feed->{newposts}=0;
-               $IkiWiki::forcerebuild{$feed->{sourcepage}}=1;
+       foreach my $guid (values %guids) {
+               # any guid whose feed is gone should be removed
+               if (! exists $feeds{$guid->{feed}}) {
+                       unlink pagefile($guid->{page})
+                               if exists $guid->{page};
+                       delete $guids{$guid->{guid}};
+               }
+               # handle expired guids
+               elsif ($guid->{expired} && exists $guid->{page}) {
+                       unlink pagefile($guid->{page});
+                       delete $guid->{page};
+                       delete $guid->{md5};
+               }
+       }
+} #}}}

 
 

-               IkiWiki::debug("checking feed ".$feed->{name}." ...");
+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();

 
 

-               my @urls=XML::Feed->find_feeds($feed->{feedurl});
-               if (! @urls) {
-                       $feed->{message}="could not find feed at ".$feed->{feedurl};
-                       IkiWiki::debug($feed->{message});
-                       next FEED;
+       # 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 numposts
+                                             newposts error}) {
+                               $feeds{$name}->{$field}=$myfeeds{$name}->{$field};
+                       }
+               }
+       }
+
+       # New guids can be created 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};

                }
                }

-               foreach my $url (@urls) {
-                       my $f=eval{XML::Feed->parse(URI->new($url))};
-                       if ($@) {
-                               $feed->{message}="feed crashed XML::Feed! $@";
-                               IkiWiki::debug($feed->{message});
-                               next FEED;
+       }
+} #}}}
+
+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}} <=> $IkiWiki::pagectime{$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)"),
+                                               $item->{page}, int($days_old)));
+                                       $item->{expired}=1;
+                               }

                        }
                        }

-                       if (! $f) {
-                               $feed->{message}=XML::Feed->errstr;
-                               IkiWiki::debug($feed->{message});
-                               next FEED;
+                       elsif ($feed->{expirecount} &&
+                              $count >= $feed->{expirecount}) {
+                               debug(sprintf(gettext("expiring %s"), $item->{page}));
+                               $item->{expired}=1;

                        }
                        }

-
-                       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,
-                               );
+                       else {
+                               if (! $seen{$item->{page}}) {
+                                       $seen{$item->{page}}=1;
+                                       $count++;
+                               }

                        }
                }
                        }
                }

-               $feed->{message}="processed ok";

        }
        }

+} #}}}

 
 

-       # TODO: expiry
+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 $@;
+       eval q{use HTML::Entities};
+       error($@) if $@;
+
+       foreach my $feed (@_) {
+               $feed->{lastupdate}=time;
+               $feed->{newposts}=0;
+               $feed->{message}=sprintf(gettext("processed ok at %s"),
+                       displaytime($feed->{lastupdate}));
+               $feed->{error}=0;
+
+               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->{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;
+               }
+               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.
+                       $feed->{message}.=" ".sprintf(gettext("(invalid UTF-8 stripped from feed)"));
+                       $content=Encode::decode_utf8($content);
+                       $f=eval{XML::Feed->parse(\$content)};
+               }
+               if ($@) {
+                       # Another possibility is badly escaped entities.
+                       $feed->{message}.=" ".sprintf(gettext("(feed entities escaped)"));
+                       $content=~s/\&(?!amp)(\w+);/&amp;$1;/g;
+                       $content=Encode::decode_utf8($content);
+                       $f=eval{XML::Feed->parse(\$content)};
+               }
+               if ($@) {
+                       $feed->{message}=gettext("feed crashed XML::Feed!")." ($@)";
+                       $feed->{error}=1;
+                       debug($feed->{message});
+                       next;
+               }
+               if (! $f) {
+                       $feed->{message}=XML::Feed->errstr;
+                       $feed->{error}=1;
+                       debug($feed->{message});
+                       next;
+               }
+
+               foreach my $entry ($f->entries) {
+                       add_page(
+                               feed => $feed,
+                               copyright => $f->copyright,
+                               title => defined $entry->title ? decode_entities($entry->title) : "untitled",
+                               link => $entry->link,
+                               content => defined $entry->content->body ? $entry->content->body : "",
+                               guid => defined $entry->id ? $entry->id : time."_".$feed->name,
+                               ctime => $entry->issued ? ($entry->issued->epoch || time) : time,
+                       );
+               }
+       }

 } #}}}
 
 sub add_page (@) { #{{{
 } #}}}
 
 sub add_page (@) { #{{{


@@ -233,6 +424,7 @@ sub add_page (@) { #{{{
        if (exists $guids{$params{guid}}) {
                # updating an existing post
                $guid=$guids{$params{guid}};
        if (exists $guids{$params{guid}}) {
                # updating an existing post
                $guid=$guids{$params{guid}};

+               return if $guid->{expired};

        }
        else {
                # new post
        }
        else {
                # new post


@@ -243,19 +435,35 @@ sub add_page (@) { #{{{
                $feed->{newposts}++;
 
                # assign it an unused page
                $feed->{newposts}++;
 
                # assign it an unused page

-               my $page=$feed->{dir}."/".IkiWiki::titlepage($params{title});
-               ($page)=$page=~/$IkiWiki::config{wiki_file_regexp}/;
+               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";
                }
                if (! defined $page || ! length $page) {
                        $page=$feed->{dir}."/item";
                }

-               $page=~s/\.\.//g; # avoid ".." directory tricks

                my $c="";
                my $c="";

-               while (exists $IkiWiki::pagesources{$page.$c} ||
+               while (exists $IkiWiki::pagecase{lc $page.$c} ||

                       -e pagefile($page.$c)) {
                        $c++
                }
                       -e pagefile($page.$c)) {
                        $c++
                }

+
+               # Make sure that the file name isn't too long. 
+               # NB: This doesn't check for path length limits.
+               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 pagefile($page.$c)) {
+                               $c++
+                       }
+               }
+

                $guid->{page}=$page;
                $guid->{page}=$page;

-               IkiWiki::debug("creating new page $page");
+               debug(sprintf(gettext("creating new page %s"), $page));

        }
        $guid->{feed}=$feed->{name};
        
        }
        $guid->{feed}=$feed->{name};
        


@@ -263,47 +471,117 @@ sub add_page (@) { #{{{
        # to avoid unneccessary rebuilding. The mtime from rss cannot be
        # trusted; let's use a digest.
        eval q{use Digest::MD5 'md5_hex'};
        # 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}));
        require Encode;
        my $digest=md5_hex(Encode::encode_utf8($params{content}));

-       return unless ! exists $guid->{md5} || $guid->{md5} ne $digest;
+       return unless ! exists $guid->{md5} || $guid->{md5} ne $digest || $config{rebuild};

        $guid->{md5}=$digest;
 
        # Create the page.
        $guid->{md5}=$digest;
 
        # Create the page.

-       my $template=IkiWiki::template("aggregatepost.tmpl", blind_cache => 1);
-       my $content=$params{content};
-       $params{content}=~s/(?<!\\)\[\[/\\\[\[/g; # escape accidental wikilinks
-                                                 # and preprocessor stuff
-       $template->param(content => $params{content});
-       $template->param(url => $feed->{url});
+       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(name => $feed->{name});

-       $template->param(link => $params{link}) if defined $params{link};
+       $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}}]);
        }
        if (ref $feed->{tags}) {
                $template->param(tags => [map { tag => $_ }, @{$feed->{tags}}]);
        }

-       IkiWiki::writefile($guid->{page}.".html", $IkiWiki::config{srcdir},
+       writefile(htmlfn($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.
                $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;
+       utime $mtime, $mtime, pagefile($guid->{page})
+               if defined $mtime && $mtime <= time;

 } #}}}
 
 } #}}}
 

-sub remove_feeds () { #{{{
-       my $page=shift;
+sub htmlescape ($) { #{{{
+       # escape accidental wikilinks and preprocessor stuff
+       my $html=shift;
+       $html=~s/(?<!\\)\[\[/\\\[\[/g;
+       return $html;
+} #}}}

 
 

-       my %removed;
-       foreach my $id (keys %feeds) {
-               if ($feeds{$id}->{sourcepage} eq $page) {
-                       $feeds{$id}->{remove}=1;
-                       $removed{$id}=1;
+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 pagefile ($) { #{{{
        my $page=shift;
 
 } #}}}
 
 sub pagefile ($) { #{{{
        my $page=shift;
 

-       return "$IkiWiki::config{srcdir}/$page.html";
+       return "$config{srcdir}/".htmlfn($page);
+} #}}}
+
+sub htmlfn ($) { #{{{
+       return shift().".".$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
 } #}}}
 
 1