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<?php
/**
 * Created by PhpStorm.
 * User: ShaOn
 * Date: 8/28/2019
 * Time: 3:42 PM
 */

namespace App\Classes;

class CoinPaymentsAPI
{
    private $private_key = '';
    private $public_key = '';
    private $ch = null;

public function Setup($private_key, $public_key) {
        $this->private_key = $private_key;
        $this->public_key = $public_key;
        $this->ch = null;
    }

/**
     * Gets the current CoinPayments.net exchange rate. Output includes both crypto and fiat currencies.
     * @param short If short == TRUE (the default), the output won't include the currency names and confirms needed to save bandwidth.
     */
    public function GetRates($short = TRUE) {
        $short = $short ? 1:0;
        return $this->api_call('rates', array('short' => $short));
    }

/**
 * Gets your current coin balances (only includes coins with a balance unless all = TRUE). 
 * @param all If all = TRUE then it will return all coins, even those with a 0 balance.
 */
 public function GetBalances($all = FALSE) {
 return $this->api_call('balances', array('all' => $all ? 1:0));
 }

/**
 * Creates a basic transaction with minimal parameters. 
 * See CreateTransaction for more advanced features.
 * @param amount The amount of the transaction (floating point to 8 decimals).
 * @param currency1 The source currency (ie. USD), this is used to calculate the exchange rate for you.
 * @param currency2 The cryptocurrency of the transaction. currency1 and currency2 can be the same if you don't want any exchange rate conversion.
 * @param buyer_email Set the buyer's email so they can automatically claim refunds if there is an issue with their payment.
 * @param address Optionally set the payout address of the transaction. If address is empty then it will follow your payout settings for that coin.
 * @param ipn_url Optionally set an IPN handler to receive notices about this transaction. If ipn_url is empty then it will use the default IPN URL in your account.
 */
 public function CreateTransactionSimple($amount, $currency1, $currency2, $buyer_email, $address='', $ipn_url='') {
 $req = array(
 'amount' => $amount,
 'currency1' => $currency1,
 'currency2' => $currency2,
 'buyer_email' => $buyer_email,
 'address' => $address,
 'ipn_url' => $ipn_url,
 );
 return $this->api_call('create_transaction', $req);
 }

public function CreateTransaction($req) {

return $this->api_call('create_transaction', $req);
    }

/**
 * Creates an address for receiving payments into your CoinPayments Wallet. 
 * @param currency The cryptocurrency to create a receiving address for.
 * @param ipn_url Optionally set an IPN handler to receive notices about this transaction. If ipn_url is empty then it will use the default IPN URL in your account.
 */
 public function GetCallbackAddress($currency, $ipn_url = '') {
 $req = array(
 'currency' => $currency,
 'ipn_url' => $ipn_url,
 );
 return $this->api_call('get_callback_address', $req);
 }

/**
 * Creates a withdrawal from your account to a specified address. 
 * @param amount The amount of the transaction (floating point to 8 decimals).
 * @param currency The cryptocurrency to withdraw.
 * @param address The address to send the coins to.
 * @param auto_confirm If auto_confirm is TRUE, then the withdrawal will be performed without an email confirmation.
 * @param ipn_url Optionally set an IPN handler to receive notices about this transaction. If ipn_url is empty then it will use the default IPN URL in your account.
 */
 public function CreateWithdrawal($amount, $currency, $address, $auto_confirm = FALSE, $ipn_url = '') {
 $req = array(
 'amount' => $amount,
 'currency' => $currency,
 'address' => $address,
 'auto_confirm' => $auto_confirm ? 1:0,
 'ipn_url' => $ipn_url,
 );
 return $this->api_call('create_withdrawal', $req);
 }

/**
 * Creates a transfer from your account to a specified merchant. 
 * @param amount The amount of the transaction (floating point to 8 decimals).
 * @param currency The cryptocurrency to withdraw.
 * @param merchant The merchant ID to send the coins to.
 * @param auto_confirm If auto_confirm is TRUE, then the transfer will be performed without an email confirmation.
 */
 public function CreateTransfer($amount, $currency, $merchant, $auto_confirm = FALSE) {
 $req = array(
 'amount' => $amount,
 'currency' => $currency,
 'merchant' => $merchant,
 'auto_confirm' => $auto_confirm ? 1:0,
 );
 return $this->api_call('create_transfer', $req);
 }

/**
 * Creates a transfer from your account to a specified $PayByName tag. 
 * @param amount The amount of the transaction (floating point to 8 decimals).
 * @param currency The cryptocurrency to withdraw.
 * @param pbntag The $PayByName tag to send funds to.
 * @param auto_confirm If auto_confirm is TRUE, then the transfer will be performed without an email confirmation.
 */
 public function SendToPayByName($amount, $currency, $pbntag, $auto_confirm = FALSE) {
 $req = array(
 'amount' => $amount,
 'currency' => $currency,
 'pbntag' => $pbntag,
 'auto_confirm' => $auto_confirm ? 1:0,
 );
 return $this->api_call('create_transfer', $req);
 }

private function is_setup() {
       
        return (!empty($this->private_key) && !empty($this->public_key));
    }

private function api_call($cmd, $req = array()) {
        
        if (!$this->is_setup()) {
            return array('error' => 'You have not called the Setup function with your private and public keys!');
        }

// Set the API command and required fields
        $req['version'] = 1;
        $req['cmd'] = $cmd;
        $req['key'] = $this->public_key;
        $req['format'] = 'json'; //supported values are json and xml

// Generate the query string
        $post_data = http_build_query($req, '', '&');

// Calculate the HMAC signature on the POST data
        $hmac = hash_hmac('sha512', $post_data, $this->private_key);

static $ch = NULL;
    if ($ch === NULL) {
        $ch = curl_init('https://www.coinpayments.net/api.php');
        curl_setopt($ch, CURLOPT_FAILONERROR, TRUE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    }
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('HMAC: '.$hmac));
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);

// Execute the call and close cURL handle
    $data = curl_exec($ch);

// Create cURL handle and initialize (if needed)
 if ($this->ch === null) {
 $this->ch = curl_init('https://www.coinpayments.net/api.php');
 curl_setopt($this->ch, CURLOPT_FAILONERROR, TRUE);
 curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, TRUE);
 curl_setopt($this->ch, CURLOPT_SSL_VERIFYPEER, 0);
 }
 curl_setopt($this->ch, CURLOPT_HTTPHEADER, array('HMAC: '.$hmac));
 curl_setopt($this->ch, CURLOPT_POSTFIELDS, $post_data);
 
 $data = curl_exec($this->ch);
 
 
 
 
 
 if ($data !== FALSE) {
 if (PHP_INT_SIZE < 8 && version_compare(PHP_VERSION, '5.4.0') >= 0) {
 // We are on 32-bit PHP, so use the bigint as string option. If you are using any API calls with Satoshis it is highly NOT recommended to use 32-bit PHP
 $dec = json_decode($data, TRUE, 512, JSON_BIGINT_AS_STRING);
 } else {
 $dec = json_decode($data, TRUE);
 }
 if ($dec !== NULL && count($dec)) {
 return $dec;
 } else {
 // If you are using PHP 5.5.0 or higher you can use json_last_error_msg() for a better error message
 return array('error' => 'Unable to parse JSON result ('.json_last_error().')');
 }
 } else {
 return array('error' => 'cURL error: '.curl_error($this->ch));
 }
 }
}