path: root/IkiWiki/Plugin/blogspam.pm

#!/usr/bin/perl
package IkiWiki::Plugin::blogspam;

use warnings;
use strict;
use IkiWiki 3.00;
use Encode;

my $defaulturl='http://test.blogspam.net:8888/';

sub import {
    hook(type => "getsetup", id => "blogspam",  call => \&getsetup);
    hook(type => "checkconfig", id => "blogspam", call => \&checkconfig);
    hook(type => "checkcontent", id => "blogspam", call => \&checkcontent);
}

sub getsetup () {
    return
        plugin => {
            safe => 1,
            rebuild => 0,
            section => "auth",
        },
        blogspam_pagespec => {
            type => 'pagespec',
            example => 'postcomment(*)',
            description => 'PageSpec of pages to check for spam',
            link => 'ikiwiki/PageSpec',
            safe => 1,
            rebuild => 0,
        },
        blogspam_options => {
            type => "string",
            example => "blacklist=1.2.3.4,blacklist=8.7.6.5,max-links=10",
            description => "options to send to blogspam server",
            link => "http://blogspam.net/api/testComment.html#options",
            safe => 1,
            rebuild => 0,
        },
        blogspam_server => {
            type => "string",
            default => $defaulturl,
            description => "blogspam server XML-RPC url",
            safe => 1,
            rebuild => 0,
        },
}

sub checkconfig () {
    # This is done at checkconfig time because printing an error
    # if the module is missing when a spam is posted would not
    # let the admin know about the problem.
    eval q{
        use RPC::XML;
        use RPC::XML::Client;
    };
    error $@ if $@;
}

sub checkcontent (@) {
    my %params=@_;
    my $session=$params{session};
    
    my $spec='!admin()';
    if (exists $config{blogspam_pagespec} &&
        length $config{blogspam_pagespec}) {
        $spec.=" and (".$config{blogspam_pagespec}.")";
    }

    my $user=$session->param("name");
    return undef unless pagespec_match($params{page}, $spec,
        (defined $user ? (user => $user) : ()),
        (defined $session->remote_addr() ? (ip => $session->remote_addr()) : ()),
        location => $params{page});

    my $url=$defaulturl;
    $url = $config{blogspam_server} if exists $config{blogspam_server};

    my $client = RPC::XML::Client->new($url);

    my @options = split(",", $config{blogspam_options})
        if exists $config{blogspam_options};

    # Allow short comments and whitespace-only edits, unless the user
    # has overridden min-words themselves.
    push @options, "min-words=0"
        unless grep /^min-words=/i, @options;
    # Wiki pages can have a lot of urls, unless the user specifically
    # wants to limit them.
    push @options, "exclude=lotsaurls"
        unless grep /^max-links/i, @options;
    # Unless the user specified a size check, disable such checking.
    push @options, "exclude=size"
        unless grep /^(?:max|min)-size/i, @options;
    # This test has absurd false positives on words like "alpha"
    # and "buy".
    push @options, "exclude=stopwords";

    my %req=(
        ip => $session->remote_addr(),
        comment => encode_utf8(defined $params{diff} ? $params{diff} : $params{content}),
        subject => encode_utf8(defined $params{subject} ? $params{subject} : ""),
        name => encode_utf8(defined $params{author} ? $params{author} : ""),
        link => encode_utf8(exists $params{url} ? $params{url} : ""),
        options => join(",", @options),
        site => encode_utf8($config{url}),
        version => "ikiwiki ".$IkiWiki::version,
    );
    my $res = $client->send_request('testComment', \%req);

    if (! ref $res || ! defined $res->value) {
        debug("failed to get response from blogspam server ($url)");
        return undef;
    }
    elsif ($res->value =~ /^SPAM:(.*)/) {
        eval q{use Data::Dumper};
        debug("blogspam server reports ".$res->value.": ".Dumper(\%req));
        return gettext("Sorry, but that looks like spam to <a href=\"http://blogspam.net/\">blogspam</a>: ").$1;
    }
    elsif ($res->value ne 'OK') {
        debug("blogspam server failure: ".$res->value);
        return undef;
    }
    else {
        return undef;
    }
}

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