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<?php |
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/** |
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* @author Threema GmbH |
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* @copyright Copyright (c) 2015-2016 Threema GmbH |
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*/ |
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namespace Threema\MsgApi\PublicKeyStores; |
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use Threema\Core\Exception; |
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use Threema\MsgApi\PublicKeyStore; |
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/** |
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* Store the PublicKeys in a PHP file |
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* |
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* @package Threema\MsgApi\PublicKeyStores |
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*/ |
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class PhpFile extends PublicKeyStore |
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{ |
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/** |
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* PHP code used to prevent unauthorized access |
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* |
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* @var string |
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*/ |
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private $fileBlocker = '<?php if (!isset($isMsgApiKeystore) || !$isMsgApiKeystore) die(\'Unauthorized access\');'; |
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/** |
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* @var string |
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*/ |
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private $file; |
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/** |
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* cache of array |
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* |
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* @var array |
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*/ |
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private $keystore = array(); |
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/** |
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* @param string $file path to a read and writable (empty) PHP file |
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* @throws Exception if the file does not exist, is not writable or no valid PHP file |
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*/ |
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public function __construct($file) |
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{ |
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if (false === is_writable($file)) { |
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throw new Exception('file ' . $file . ' does not exist or is not writable'); |
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} |
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if (pathinfo($file, PATHINFO_EXTENSION) != 'php') { |
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throw new Exception('file ' . $file . ' is not a valid PHP file'); |
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} |
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$this->file = $file; |
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} |
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/** |
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* return null if the public key not found in the store |
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* |
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* @param string $threemaId |
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* @return null|string |
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*/ |
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public function findPublicKey($threemaId) |
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{ |
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$threemaId = strtoupper($threemaId); |
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$publicKey = null; |
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//Pre-check loaded array |
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if (array_key_exists($threemaId, $this->keystore)) { |
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$publicKey = $this->keystore[$threemaId]; |
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return $publicKey; |
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} |
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//Parse file |
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$keystore = array(); |
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$isMsgApiKeystore = true; |
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require $this->file; |
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//Update cache |
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$this->keystore = $keystore; |
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//Check file content |
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if (array_key_exists($threemaId, $keystore)) { |
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$publicKey = $keystore[$threemaId]; |
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} |
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return $publicKey; |
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} |
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/** |
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* save a public key |
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* |
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* @param string $threemaId |
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* @param string $publicKey |
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* @throws Exception |
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* @return bool |
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*/ |
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public function savePublicKey($threemaId, $publicKey) |
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{ |
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//create file if needed |
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$this->initFile(); |
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//check for key |
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if (array_key_exists($threemaId, $this->keystore)) { |
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return false; |
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} |
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//add key |
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$this->keystore[$threemaId] = $publicKey; |
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$content = '$keystore[\'' . $threemaId . '\'] = \'' . $publicKey . '\';' . PHP_EOL; |
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//write content |
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$fileadd = file_put_contents($this->file, $content, FILE_APPEND); |
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if (!$fileadd) { |
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throw new Exception('could not write to file ' . $this->file); |
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} |
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return true; |
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} |
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/** |
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* initiate a php file |
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* |
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* @param null|resource file handle for file opened in r+ mode |
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* @return bool |
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* @throws Exception |
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*/ |
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private function initFile($fileHandle = null) |
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{ |
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//check if file does already contain content |
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if (filesize($this->file) != 0) { |
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return true; |
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} |
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//manually open file if no file handle is given |
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$fileopened = null; |
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if (null === $fileHandle) { |
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$fileHandle = fopen($this->file, 'r+'); |
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$fileopened = true; |
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//check for success |
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if (null === $fileHandle) { |
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throw new Exception('could not open file ' . $this->file); |
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} |
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} |
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//create content |
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$content = $this->fileBlocker . PHP_EOL; |
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$content .= PHP_EOL; |
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$content .= '//Threema MsgApi phpfile keystore' . PHP_EOL; |
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$content .= '//DO NOT EDIT THIS FILE!' . PHP_EOL; |
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$content .= PHP_EOL; |
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//write file |
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$fwrite = fwrite($fileHandle, $content); |
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if (!$fwrite) { |
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throw new Exception('could not write to file ' . $this->file); |
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} |
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//close file if necessary |
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if ($fileopened) { |
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$fclose = fclose($fileHandle); |
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if (!$fclose) { |
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throw new Exception('error while processing file ' . $this->file); |
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} |
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} |
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return true; |
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} |
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/** |
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* Initialize a new PhpFile Public Key Store |
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* @param string $path the file will be created if it does not exist |
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* @return PhpFile |
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*/ |
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public static function create($path) { |
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if(false === file_exists($path)) { |
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//touch |
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touch($path); |
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} |
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return new PhpFile($path); |
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} |
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} |
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rugk /
threema-msgapi-sdk-php
