gnu-social/Spam_score.php

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<?php
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/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2011, StatusNet, Inc.
*
* Score of a notice by activity spam service
*
* PHP version 5
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Spam
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2011 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET')) {
exit(1);
}
/**
* Score of a notice per the activity spam service
*
* @category Spam
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @license http://www.fsf.org/licensing/licenses/agpl.html AGPLv3
* @link http://status.net/
*
* @see DB_DataObject
*/
class Spam_score extends Managed_DataObject
{
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const MAX_SCALE = 10000;
public $__table = 'spam_score'; // table name
public $notice_id; // int
public $score; // float
public $created; // datetime
/**
* Get an instance by key
*
* @param string $k Key to use to lookup (usually 'notice_id' for this class)
* @param mixed $v Value to lookup
*
* @return Spam_score object found, or null for no hits
*
*/
function staticGet($k, $v=null)
{
return Managed_DataObject::staticGet('Spam_score', $k, $v);
}
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function saveNew($notice, $result) {
$score = new Spam_score();
$score->notice_id = $notice->id;
$score->score = $result->probability;
$score->is_spam = $result->isSpam;
$score->scaled = Spam_score::scale($score->score);
$score->created = common_sql_now();
$score->notice_created = $notice->created;
$score->insert();
self::blow('spam_score:notice_ids');
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return $score;
}
function save($notice, $result) {
$orig = null;
$score = Spam_score::staticGet('notice_id', $notice->id);
if (empty($score)) {
$score = new Spam_score();
} else {
$orig = clone($score);
}
$score->notice_id = $notice->id;
$score->score = $result->probability;
$score->is_spam = $result->isSpam;
$score->scaled = Spam_score::scale($score->score);
$score->created = common_sql_now();
$score->notice_created = $notice->created;
if (empty($orig)) {
$score->insert();
} else {
$score->update($orig);
}
self::blow('spam_score:notice_ids');
return $score;
}
function delete()
{
self::blow('spam_score:notice_ids');
self::blow('spam_score:notice_ids;last');
parent::delete();
}
/**
* The One True Thingy that must be defined and declared.
*/
public static function schemaDef()
{
return array(
'description' => 'score of the notice per activityspam',
'fields' => array(
'notice_id' => array('type' => 'int',
'not null' => true,
'description' => 'notice getting scored'),
'score' => array('type' => 'double',
'not null' => true,
'description' => 'score for the notice (0.0, 1.0)'),
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'scaled' => array('type' => 'int',
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'description' => 'scaled score for the notice (0, 10000)'),
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'is_spam' => array('type' => 'tinyint',
'description' => 'flag for spamosity'),
'created' => array('type' => 'datetime',
'not null' => true,
'description' => 'date this record was created'),
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'notice_created' => array('type' => 'datetime',
'description' => 'date the notice was created'),
),
'primary key' => array('notice_id'),
'foreign keys' => array(
'spam_score_notice_id_fkey' => array('notice', array('notice_id' => 'id')),
),
'indexes' => array(
'spam_score_created_idx' => array('created'),
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'spam_score_scaled_idx' => array('scaled'),
),
);
}
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public static function upgrade()
{
Spam_score::upgradeScaled();
Spam_score::upgradeIsSpam();
Spam_score::upgradeNoticeCreated();
}
protected static function upgradeScaled()
{
$score = new Spam_score();
$score->whereAdd('scaled IS NULL');
if ($score->find()) {
while ($score->fetch()) {
$orig = clone($score);
$score->scaled = Spam_score::scale($score->score);
$score->update($orig);
}
}
}
protected static function upgradeIsSpam()
{
$score = new Spam_score();
$score->whereAdd('is_spam IS NULL');
if ($score->find()) {
while ($score->fetch()) {
$orig = clone($score);
$score->is_spam = ($score->score >= 0.90) ? 1 : 0;
$score->update($orig);
}
}
}
protected static function upgradeNoticeCreated()
{
$score = new Spam_score();
$score->whereAdd('notice_created IS NULL');
if ($score->find()) {
while ($score->fetch()) {
$notice = Notice::staticGet('id', $score->notice_id);
if (!empty($notice)) {
$orig = clone($score);
$score->notice_created = $notice->created;
$score->update($orig);
}
}
}
}
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public static function scale($score)
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{
$raw = round($score * Spam_score::MAX_SCALE);
return max(0, min(Spam_score::MAX_SCALE, $raw));
}
}