107 lines
1.9 KiB
PHP
107 lines
1.9 KiB
PHP
<?php
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class nextpage{
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public function __construct($scraper){
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$this->scraper = $scraper;
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}
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public function store($payload, $page){
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$page = $page[0];
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$password = random_bytes(256); // 2048 bit
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$salt = random_bytes(16);
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$key = hash_pbkdf2("sha512", $password, $salt, 20000, 32, true);
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$iv =
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random_bytes(
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openssl_cipher_iv_length("aes-256-gcm")
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);
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$tag = "";
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$out = openssl_encrypt($payload, "aes-256-gcm", $key, OPENSSL_RAW_DATA, $iv, $tag, "", 16);
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$key = apcu_inc("key", 1);
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apcu_store(
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$page . "." .
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$this->scraper .
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(string)$key,
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gzdeflate($salt.$iv.$out.$tag),
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900 // cache information for 15 minutes blaze it
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);
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return
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$this->scraper . $key . "." .
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rtrim(strtr(base64_encode($password), '+/', '-_'), '=');
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}
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public function get($npt, $page){
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$page = $page[0];
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$explode = explode(".", $npt, 2);
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if(count($explode) !== 2){
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throw new Exception("Malformed nextPageToken!");
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}
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$apcu = $page . "." . $explode[0];
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$key = $explode[1];
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$payload = apcu_fetch($apcu);
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if($payload === false){
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throw new Exception("The nextPageToken is invalid or has expired!");
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}
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$key =
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base64_decode(
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str_pad(
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strtr($key, '-_', '+/'),
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strlen($key) % 4,
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'=',
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STR_PAD_RIGHT
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)
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);
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$payload = gzinflate($payload);
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$key =
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hash_pbkdf2(
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"sha512",
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$key,
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substr($payload, 0, 16), // salt
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20000,
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32,
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true
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);
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$ivlen = openssl_cipher_iv_length("aes-256-gcm");
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$payload =
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openssl_decrypt(
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substr(
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$payload,
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16 + $ivlen,
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-16
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),
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"aes-256-gcm",
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$key,
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OPENSSL_RAW_DATA,
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substr($payload, 16, $ivlen),
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substr($payload, -16)
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);
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if($payload === false){
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throw new Exception("The nextPageToken is invalid or has expired!");
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}
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// remove the key after using
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apcu_delete($apcu);
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return $payload;
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}
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}
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