75 lines
1.9 KiB
PHP
75 lines
1.9 KiB
PHP
<?php
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class DataHandler {
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protected $data_folder = 'data/';
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protected $id;
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protected $version;
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public function __construct($id = '') {
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if ($id === '') $id = $this->getNewId();
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$this->id = preg_replace('/[^0-9a-zA-Z]/', '', $id); // remove every char, except allowed
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}
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public function _get() {
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$return = new stdClass();
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$return->id = $this->id;
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$data = $this->readData();
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if ($data === false) {
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$return->result = false;
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$return->errorMsg = 'there is no data with this identifier or data could not be read';
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return $return;
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}
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$return->result = true;
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$return->version = md5($data);
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$return->data = $data;
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return $return;
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}
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public function _set($data, $version = '') {
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$data = (string) $data;
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$version = (string) $version;
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$return = new stdClass();
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$return->id = $this->id;
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// check if version is out of date
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$data_org = $this->readData();
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if ($data_org !== false && md5($data_org) !== $version) {
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$return->result = false;
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$return->errorMsg = 'used version is out of date';
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return $return;
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}
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// write data
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if(file_put_contents($this->data_folder.$this->id, $data, LOCK_EX ) === false) {
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$return->result = false;
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$return->errorMsg = 'data could not be written';
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return $return;
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}
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$return->version = md5($data);
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$return->result = true;
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return $return;
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}
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protected function getNewId() {
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$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$length = 10;
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$randomString = '';
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for ($i = 0; $i < $length; $i++) {
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$randomString .= $characters[rand(0, strlen($characters) - 1)];
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}
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// check if id is already used, generate new one if necessary
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if (file_exists($this->data_folder.$randomString)) $randomString = getNewId();
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return $randomString;
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}
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protected function readData() {
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return file_exists($this->data_folder.$this->id) ? file_get_contents($this->data_folder.$this->id) : false;
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}
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}
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?>
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