gnu-social/lib/search/search_engines.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
defined('GNUSOCIAL') || die();
class SearchEngine
{
protected $target;
protected $table;
public function __construct($target, $table)
{
$this->target = $target;
$this->table = $table;
}
public function query($q)
{
}
public function limit($offset, $count, $rss = false)
{
return $this->target->limit($offset, $count);
}
public function set_sort_mode($mode)
{
switch ($mode) {
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case 'chron':
return $this->target->orderBy('created DESC');
break;
case 'reverse_chron':
return $this->target->orderBy('created ASC');
break;
case 'nickname_desc':
if ($this->table != 'profile') {
throw new Exception(
'nickname_desc sort mode can only be use when searching profile.'
);
} else {
return $this->target->orderBy(sprintf('%1$s.nickname DESC', $this->table));
}
break;
case 'nickname_asc':
if ($this->table != 'profile') {
throw new Exception(
'nickname_desc sort mode can only be use when searching profile.'
);
} else {
return $this->target->orderBy(sprintf('%1$s.nickname ASC', $this->table));
}
break;
default:
return $this->target->orderBy('created DESC');
break;
}
}
}
class MySQLSearch extends SearchEngine
{
public function query($q)
{
if ($this->table === 'profile') {
$this->target->whereAdd(sprintf(
'MATCH (%2$s.nickname, %2$s.fullname, %2$s.location, %2$s.bio, %2$s.homepage) ' .
'AGAINST (\'%1$s\' IN BOOLEAN MODE)',
$this->target->escape($q, true),
$this->table
));
if (strtolower($q) != $q) {
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$this->target->whereAdd(
sprintf(
'MATCH (%2$s.nickname, %2$s.fullname, %2$s.location, %2$s.bio, %2$s.homepage) ' .
'AGAINST (\'%1$s\' IN BOOLEAN MODE)',
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$this->target->escape(strtolower($q), true),
$this->table
),
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'OR'
);
}
return true;
} elseif ($this->table === 'notice') {
// Don't show imported notices
$this->target->whereAdd('notice.is_local <> ' . Notice::GATEWAY);
$this->target->whereAdd(sprintf(
'MATCH (%2$s.content) AGAINST (\'%1$s\' IN BOOLEAN MODE)',
$this->target->escape($q, true),
$this->table
));
if (strtolower($q) != $q) {
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$this->target->whereAdd(
sprintf(
'MATCH (%2$s.content) AGAINST (\'%1$s\' IN BOOLEAN MODE)',
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$this->target->escape(strtolower($q), true),
$this->table
),
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'OR'
);
}
return true;
} else {
throw new ServerException('Unknown table: ' . $this->table);
}
}
}
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class MySQLLikeSearch extends SearchEngine
{
public function query($q)
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{
if ($this->table === 'profile') {
$qry = sprintf(
'( %2$s.nickname LIKE \'%%%1$s%%\' ' .
' OR %2$s.fullname LIKE \'%%%1$s%%\' ' .
' OR %2$s.location LIKE \'%%%1$s%%\' ' .
' OR %2$s.bio LIKE \'%%%1$s%%\' ' .
' OR %2$s.homepage LIKE \'%%%1$s%%\')',
$this->target->escape($q, true),
$this->table
);
} elseif ($this->table === 'notice') {
$qry = sprintf('content LIKE \'%%%1$s%%\'', $this->target->escape($q, true));
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} else {
throw new ServerException('Unknown table: ' . $this->table);
}
$this->target->whereAdd($qry);
return true;
}
}
class PGSearch extends SearchEngine
{
public function query($q)
{
if ($this->table === 'profile') {
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return $this->target->whereAdd('textsearch @@ plainto_tsquery(\'' . $this->target->escape($q) . '\')');
} elseif ($this->table === 'notice') {
// XXX: We need to filter out gateway notices (notice.is_local = -2) --Zach
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return $this->target->whereAdd('to_tsvector(\'english\', content) @@ plainto_tsquery(\'' . $this->target->escape($q) . '\')');
} else {
throw new ServerException('Unknown table: ' . $this->table);
}
}
}