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<?php
/**
* Copyright 2014 Facebook, Inc.
*
* You are hereby granted a non-exclusive, worldwide, royalty-free license to
* use, copy, modify, and distribute this software in source code or binary
* form for use in connection with the web services and APIs provided by
* Facebook.
*
* As with any software that integrates with the Facebook platform, your use
* of this software is subject to the Facebook Developer Principles and
* Policies [http://developers.facebook.com/policy/]. This copyright notice
* shall be included in all copies or substantial portions of the software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
namespace Facebook\PseudoRandomString;
trait PseudoRandomStringGeneratorTrait
{
/**
* Validates the length argument of a random string.
*
* @param int $length The length to validate.
*
* @throws \InvalidArgumentException
*/
public function validateLength($length)
{
if (!is_int($length)) {
throw new \InvalidArgumentException('getPseudoRandomString() expects an integer for the string length');
}
if ($length < 1) {
throw new \InvalidArgumentException('getPseudoRandomString() expects a length greater than 1');
}
}
/**
* Converts binary data to hexadecimal of arbitrary length.
*
* @param string $binaryData The binary data to convert to hex.
* @param int $length The length of the string to return.
*
* @return string
*/
public function binToHex($binaryData, $length)
{
return mb_substr(bin2hex($binaryData), 0, $length);
}
}
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