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 $this->target->orderBy('created DESC');
break;
}
}
}
class PostgreSQLSearch extends SearchEngine
{
public function query($q)
{
if ($this->table === 'profile') {
$cols = implode(" || ' ' || ", array_map(
function ($col) {
return sprintf(
'COALESCE(%s."%s", \'\')',
common_database_tablename($this->table),
$col
);
},
['nickname', 'fullname', 'location', 'bio', 'homepage']
));
$this->target->whereAdd(sprintf(
'to_tsvector(\'english\', %2$s) @@ websearch_to_tsquery(\'%1$s\')',
$this->target->escape($q, true),
$cols
));
return true;
} elseif ($this->table === 'notice') {
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// Don't show direct messages.
$this->target->whereAdd('notice.scope <> ' . Notice::MESSAGE_SCOPE);
// Don't show imported notices
$this->target->whereAdd('notice.is_local <> ' . Notice::GATEWAY);
$this->target->whereAdd(sprintf(
'to_tsvector(\'english\', "content") @@ websearch_to_tsquery(\'%1$s\')',
$this->target->escape($q, true)
));
return true;
} else {
throw new ServerException('Unknown table: ' . $this->table);
}
}
}
class MySQLSearch extends SearchEngine
{
public function query($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') {
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// Don't show direct messages.
$this->target->whereAdd('notice.scope <> ' . Notice::MESSAGE_SCOPE);
// 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: ' . $this->table);
}
}
}
class SQLLikeSearch extends SearchEngine
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{
public function query($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') {
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// Don't show direct messages.
$this->target->whereAdd('notice.scope <> ' . Notice::MESSAGE_SCOPE);
// Don't show imported notices
$this->target->whereAdd('notice.is_local <> ' . Notice::GATEWAY);
$qry = sprintf(
'notice.content LIKE \'%%%1$s%%\'',
$this->target->escape($q, true)
);
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} else {
throw new ServerException('Unknown table: ' . $this->table);
}
$this->target->whereAdd($qry);
return true;
}
}