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<?php
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/**
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* SerializeParser
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*
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* @copyright Jason Judge
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*
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* @license http://opensource.org/licenses/MIT MIT
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*
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* @link https://github.com/academe/SerializeParser/blob/master/src/Parser.php
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*
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* The original code was modified by Nextendweb. We stripped the not relevant parts.
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*/
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namespace Nextend\SmartSlider3\BackupSlider\Serialize;
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use Nextend\Framework\Notification\Notification;
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class Parser {
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protected $allowedClassNames = [
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'Nextend\SmartSlider3\BackupSlider\BackupData',
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'Nextend\SmartSlider3\Slider\SliderParams'
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];
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/**
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* This is the recursive parser.
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*/
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protected function doParse(StringReader $string) {
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// May be : or ; as a terminator, depending on what the data
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// type is.
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$type = substr($string->read(2), 0, 1);
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switch ($type) {
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case 'a':
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// Associative array: a:length:{[index][value]...}
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$count = (int)$string->readUntil(':');
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// Eat the opening "{" of the array.
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$string->read(1);
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for ($i = 0; $i < $count; $i++) {
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$this->doParse($string);//array key
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$this->doParse($string);//array value
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}
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// Eat "}" terminating the array.
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$string->read(1);
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break;
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case 'O':
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// Object: O:length:"class":length:{[property][value]...}
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$len = (int)$string->readUntil(':');
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// +2 for quotes
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$class = $string->read(2 + $len);
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if (!in_array($class, $this->allowedClassNames)) {
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Notification::error(sprintf(n2_('The importing failed as the slider export contained an invalid class name: %1$s'), '<br>' . $class));
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return false;
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}
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// Eat the separator
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$string->read(1);
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// Read the number of properties.
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$len = (int)$string->readUntil(':');
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// Eat "{" holding the properties.
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$string->read(1);
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for ($i = 0; $i < $len; $i++) {
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$this->doParse($string);//prop key
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$this->doParse($string);//prop value
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}
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// Eat "}" terminating properties.
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$string->read(1);
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break;
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case 's':
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$len = (int)$string->readUntil(':');
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$string->read($len + 2);
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// Eat the separator
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$string->read(1);
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break;
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case 'i':
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$string->readUntil(';');
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break;
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case 'd':
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$string->readUntil(';');
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break;
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case 'b':
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// Boolean is 0 or 1
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$string->read(2);
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break;
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case 'N':
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break;
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default:
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Notification::error(sprintf(n2_('The importing failed as we are not able to unserialize the type: "%s"'), '<br>' . $type));
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return false;
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}
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return true;
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}
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/**
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* @param $string
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*
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*
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* Checks if the $string contains any Class names which are not allowed by us!
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* This is the initial entry point into the recursive parser.
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*
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* @return bool
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* @throws \Exception
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*/
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public function isValidData($string) {
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return $this->doParse(new StringReader($string));
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}
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}
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@ -0,0 +1,117 @@
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<?php
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/**
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* SerializeParser
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*
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* @copyright Jason Judge
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*
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* @license http://opensource.org/licenses/MIT MIT
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*
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* @link https://github.com/academe/SerializeParser/blob/master/src/StringReader.php
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*/
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namespace Nextend\SmartSlider3\BackupSlider\Serialize;
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/**
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* Given a string, this class will read through the string using
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* one of a number of terminating rules:
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* - One character.
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* - A specified number of characters.
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* - Until a matching character is found.
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*/
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class StringReader
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{
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protected $pos = 0;
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protected $max = 0;
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protected $string = [];
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public function __construct($string)
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{
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// Split the string up into an array of UTF-8 characters.
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// As an array we can read through it one character at a time.
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//$this->string = preg_split('//u', $string, -1, PREG_SPLIT_NO_EMPTY);
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//$this->max = count($this->string) - 1;
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$this->string = $string;
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$this->max = strlen($this->string) - 1;
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}
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/**
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* Read the next character from the supplied string.
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* Return null when we have run out of characters.
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*/
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public function readOne()
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{
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if ($this->pos <= $this->max) {
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$value = $this->string[$this->pos];
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$this->pos += 1;
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} else {
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$value = null;
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}
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return $value;
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}
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/**
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* Read characters until we reach the given character $char.
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* By default, discard that final matching character and return
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* the rest.
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*/
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public function readUntil($char, $discard_char = true)
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{
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$value = '';
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while(null !== ($one = $this->readOne())) {
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if ($one !== $char || !$discard_char) {
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$value .= $one;
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}
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if ($one === $char) {
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break;
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}
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}
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return $value;
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}
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/**
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* Read $count characters, or until we have reached the end,
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* whichever comes first.
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* By default, remove enclosing double-quotes from the result.
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*/
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public function read($count, $strip_quotes = true)
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{
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$value = '';
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while($count > 0 && null != ($one = $this->readOne())) {
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$value .= $one;
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$count -= 1;
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}
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return $strip_quotes ? $this->stripQuotes($value) : $value;
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}
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/**
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* Remove a single set of double-quotes from around a string.
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* abc => abc
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* "abc" => abc
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* ""abc"" => "abc"
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*
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* @param string string
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* @returns string
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*/
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public function stripQuotes($string)
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{
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// Only remove exactly one quote from the start and the end,
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// and then only if there is one at each end.
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if (strlen($string) < 2 || substr($string, 0, 1) !== '"' || substr($string, -1, 1) !== '"') {
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// Too short, or does not start or end with a quote.
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return $string;
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}
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// Return the middle of the string, from the second character to the second-but-last.
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return substr($string, 1, -1);
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}
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}
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