This file is indexed.

/usr/share/php/Predis/Replication/ReplicationStrategy.php is in libphp-predis 0.8.3-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
<?php

/*
 * This file is part of the Predis package.
 *
 * (c) Daniele Alessandri <suppakilla@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Predis\Replication;

use Predis\NotSupportedException;
use Predis\Command\CommandInterface;

/**
 * Defines a strategy for master/reply replication.
 *
 * @author Daniele Alessandri <suppakilla@gmail.com>
 */
class ReplicationStrategy
{
    protected $disallowed;
    protected $readonly;
    protected $readonlySHA1;

    /**
     *
     */
    public function __construct()
    {
        $this->disallowed = $this->getDisallowedOperations();
        $this->readonly = $this->getReadOnlyOperations();
        $this->readonlySHA1 = array();
    }

    /**
     * Returns if the specified command performs a read-only operation
     * against a key stored on Redis.
     *
     * @param CommandInterface $command Instance of Redis command.
     * @return Boolean
     */
    public function isReadOperation(CommandInterface $command)
    {
        if (isset($this->disallowed[$id = $command->getId()])) {
            throw new NotSupportedException("The command $id is not allowed in replication mode");
        }

        if (isset($this->readonly[$id])) {
            if (true === $readonly = $this->readonly[$id]) {
                return true;
            }

            return call_user_func($readonly, $command);
        }

        if (($eval = $id === 'EVAL') || $id === 'EVALSHA') {
            $sha1 = $eval ? sha1($command->getArgument(0)) : $command->getArgument(0);

            if (isset($this->readonlySHA1[$sha1])) {
                if (true === $readonly = $this->readonlySHA1[$sha1]) {
                    return true;
                }

                return call_user_func($readonly, $command);
            }
        }

        return false;
    }

    /**
     * Returns if the specified command is disallowed in a master/slave
     * replication context.
     *
     * @param CommandInterface $command Instance of Redis command.
     * @return Boolean
     */
    public function isDisallowedOperation(CommandInterface $command)
    {
        return isset($this->disallowed[$command->getId()]);
    }

    /**
     * Checks if a SORT command is a readable operation by parsing the arguments
     * array of the specified commad instance.
     *
     * @param CommandInterface $command Instance of Redis command.
     * @return Boolean
     */
    protected function isSortReadOnly(CommandInterface $command)
    {
        $arguments = $command->getArguments();
        return ($c = count($arguments)) === 1 ? true : $arguments[$c - 2] !== 'STORE';
    }

    /**
     * Marks a command as a read-only operation. When the behaviour of a
     * command can be decided only at runtime depending on its arguments,
     * a callable object can be provided to dynamically check if the passed
     * instance of a command performs write operations or not.
     *
     * @param string $commandID ID of the command.
     * @param mixed $readonly A boolean or a callable object.
     */
    public function setCommandReadOnly($commandID, $readonly = true)
    {
        $commandID = strtoupper($commandID);

        if ($readonly) {
            $this->readonly[$commandID] = $readonly;
        } else {
            unset($this->readonly[$commandID]);
        }
    }

    /**
     * Marks a Lua script for EVAL and EVALSHA as a read-only operation. When
     * the behaviour of a script can be decided only at runtime depending on
     * its arguments, a callable object can be provided to dynamically check
     * if the passed instance of EVAL or EVALSHA performs write operations or
     * not.
     *
     * @param string $script Body of the Lua script.
     * @param mixed $readonly A boolean or a callable object.
     */
    public function setScriptReadOnly($script, $readonly = true)
    {
        $sha1 = sha1($script);

        if ($readonly) {
            $this->readonlySHA1[$sha1] = $readonly;
        } else {
            unset($this->readonlySHA1[$sha1]);
        }
    }

    /**
     * Returns the default list of disallowed commands.
     *
     * @return array
     */
    protected function getDisallowedOperations()
    {
        return array(
            'SHUTDOWN'          => true,
            'INFO'              => true,
            'DBSIZE'            => true,
            'LASTSAVE'          => true,
            'CONFIG'            => true,
            'MONITOR'           => true,
            'SLAVEOF'           => true,
            'SAVE'              => true,
            'BGSAVE'            => true,
            'BGREWRITEAOF'      => true,
            'SLOWLOG'           => true,
        );
    }

    /**
     * Returns the default list of commands performing read-only operations.
     *
     * @return array
     */
    protected function getReadOnlyOperations()
    {
        return array(
            'EXISTS'            => true,
            'TYPE'              => true,
            'KEYS'              => true,
            'RANDOMKEY'         => true,
            'TTL'               => true,
            'GET'               => true,
            'MGET'              => true,
            'SUBSTR'            => true,
            'STRLEN'            => true,
            'GETRANGE'          => true,
            'GETBIT'            => true,
            'LLEN'              => true,
            'LRANGE'            => true,
            'LINDEX'            => true,
            'SCARD'             => true,
            'SISMEMBER'         => true,
            'SINTER'            => true,
            'SUNION'            => true,
            'SDIFF'             => true,
            'SMEMBERS'          => true,
            'SRANDMEMBER'       => true,
            'ZRANGE'            => true,
            'ZREVRANGE'         => true,
            'ZRANGEBYSCORE'     => true,
            'ZREVRANGEBYSCORE'  => true,
            'ZCARD'             => true,
            'ZSCORE'            => true,
            'ZCOUNT'            => true,
            'ZRANK'             => true,
            'ZREVRANK'          => true,
            'HGET'              => true,
            'HMGET'             => true,
            'HEXISTS'           => true,
            'HLEN'              => true,
            'HKEYS'             => true,
            'HVALS'             => true,
            'HGETALL'           => true,
            'PING'              => true,
            'AUTH'              => true,
            'SELECT'            => true,
            'ECHO'              => true,
            'QUIT'              => true,
            'OBJECT'            => true,
            'BITCOUNT'          => true,
            'TIME'              => true,
            'SORT'              => array($this, 'isSortReadOnly'),
        );
    }
}