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bwwc-utils.php
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bwwc-utils.php
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<?php
/*
Bitcoin Cash Payments for WooCommerce
https://github.com/sanchaz/bitcoin-cash-payments-for-woocommerce
*/
//===========================================================================
/*
Input:
------
$order_info =
array (
'order_id' => $order_id,
'order_total' => $order_total_in_btc,
'order_datetime' => date('Y-m-d H:i:s T'),
'requested_by_ip' => @$_SERVER['REMOTE_ADDR'],
);
*/
// Returns:
// --------
/*
$ret_info_array = array (
'result' => 'success', // OR 'error'
'message' => '...',
'host_reply_raw' => '......',
'generated_bitcoin_address' => '18vzABPyVbbia8TDCKDtXJYXcoAFAPk2cj', // or false
);
*/
//
function BWWC__get_bitcoin_address_for_payment__electrum($electrum_mpk, $order_info)
{
global $wpdb;
// status = "unused", "assigned", "used"
$btc_addresses_table_name = $wpdb->prefix . 'bwwc_btc_addresses';
$origin_id = $electrum_mpk;
$bwwc_settings = BWWC__get_settings();
$funds_received_value_expires_in_secs = $bwwc_settings['funds_received_value_expires_in_mins'] * 60;
$assigned_address_expires_in_secs = $bwwc_settings['assigned_address_expires_in_mins'] * 60;
$clean_address = null;
$bch_cashaddr = null;
$current_time = time();
if ($bwwc_settings['reuse_expired_addresses']) {
$reuse_expired_addresses_freshb_query_part =
"OR (`status`='assigned'
AND (('$current_time' - `assigned_at`) > '$assigned_address_expires_in_secs')
AND (('$current_time' - `received_funds_checked_at`) < '$funds_received_value_expires_in_secs')
)";
} else {
$reuse_expired_addresses_freshb_query_part = "";
}
//-------------------------------------------------------
// Quick scan for ready-to-use address
// NULL == not found
// Retrieve:
// 'unused' - with fresh zero balances
// 'assigned' - expired, with fresh zero balances (if 'reuse_expired_addresses' is true)
//
// Hence - any returned address will be clean to use.
$query =
"SELECT `btc_address`, `bch_cashaddr` FROM `$btc_addresses_table_name`
WHERE `origin_id`='$origin_id'
AND `total_received_funds`='0'
AND (`status`='unused' $reuse_expired_addresses_freshb_query_part)
ORDER BY `index_in_wallet` ASC
LIMIT 1;"; // Try to use lower indexes first
$clean_address = $wpdb->get_var($query, 0, 0);
$bch_cashaddr = $wpdb->get_var(null, 1, 0);
//-------------------------------------------------------
if (!$clean_address) {
//-------------------------------------------------------
// Find all unused addresses belonging to this mpk with possibly (to be verified right after) zero balances
// Array(rows) or NULL
// Retrieve:
// 'unused' - with old zero balances
// 'unknown' - ALL
// 'assigned' - expired with old zero balances (if 'reuse_expired_addresses' is true)
//
// Hence - any returned address with freshened balance==0 will be clean to use.
if ($bwwc_settings['reuse_expired_addresses']) {
$reuse_expired_addresses_oldb_query_part =
"OR (`status`='assigned'
AND (('$current_time' - `assigned_at`) > '$assigned_address_expires_in_secs')
AND (('$current_time' - `received_funds_checked_at`) > '$funds_received_value_expires_in_secs')
)";
} else {
$reuse_expired_addresses_oldb_query_part = "";
}
$query =
"SELECT * FROM `$btc_addresses_table_name`
WHERE `origin_id`='$origin_id'
AND `total_received_funds`='0'
AND (
`status`='unused'
OR `status`='unknown'
$reuse_expired_addresses_oldb_query_part
)
ORDER BY `index_in_wallet` ASC;"; // Try to use lower indexes first
$addresses_to_verify_for_zero_balances_rows = $wpdb->get_results($query, ARRAY_A);
if (!is_array($addresses_to_verify_for_zero_balances_rows)) {
$addresses_to_verify_for_zero_balances_rows = array();
}
//-------------------------------------------------------
//-------------------------------------------------------
// Try to re-verify balances of existing addresses (with old or non-existing balances) before reverting to slow operation of generating new address.
//
$blockchains_api_failures = 0;
foreach ($addresses_to_verify_for_zero_balances_rows as $address_to_verify_for_zero_balance_row) {
// http://blockexplorer.com/q/getreceivedbyaddress/18vzABPyVbbia8TDCKDtXJYXcoAFAPk2cj
// http://blockchain.info/q/getreceivedbyaddress/18vzABPyVbbia8TDCKDtXJYXcoAFAPk2cj [?confirmations=6]
//
$address_to_verify_for_zero_balance = $address_to_verify_for_zero_balance_row['btc_address'];
$bch_cashaddr_zero_balance = $address_to_verify_for_zero_balance_row['bch_cashaddr'];
$address_request_array = array();
$address_request_array['btc_address'] = $address_to_verify_for_zero_balance;
$address_request_array['required_confirmations'] = 0;
$address_request_array['api_timeout'] = $bwwc_settings['blockchain_api_timeout_secs'];
$ret_info_array = BWWC__getreceivedbyaddress_info($address_request_array, $bwwc_settings);
if ($ret_info_array['balance'] === false) {
$blockchains_api_failures ++;
if ($blockchains_api_failures >= $bwwc_settings['max_blockchains_api_failures']) {
// Allow no more than 3 contigious blockchains API failures. After which return error reply.
$ret_info_array = array(
'result' => 'error',
'message' => $ret_info_array['message'],
'host_reply_raw' => $ret_info_array['host_reply_raw'],
'generated_bitcoin_address' => false,
'generated_bch_cashaddr' => false,
);
return $ret_info_array;
}
} else {
if ($ret_info_array['balance'] == 0) {
// Update DB with balance and timestamp, mark address as 'assigned' and return this address as clean.
$clean_address = $address_to_verify_for_zero_balance;
$bch_cashaddr = $bch_cashaddr_zero_balance;
break;
} else {
// Balance at this address suddenly became non-zero!
// It means either order was paid after expiration or "unknown" address suddenly showed up with non-zero balance or payment was sent to this address outside of this online store business.
// Mark it as 'revalidate' so cron job would check if that's possible delayed payment.
//
$address_meta = BWWC_unserialize_address_meta(@$address_to_verify_for_zero_balance_row['address_meta']);
if (isset($address_meta['orders'][0])) {
$new_status = 'revalidate';
} // Past orders are present. There is a chance (for cron job) to match this payment to past (albeit expired) order.
else {
$new_status = 'used';
} // No orders were ever placed to this address. Likely payment was sent to this address outside of this online store business.
$current_time = time();
$query =
"UPDATE `$btc_addresses_table_name`
SET
`status`='$new_status',
`total_received_funds` = '{$ret_info_array['balance']}',
`received_funds_checked_at`='$current_time'
WHERE `btc_address`='$address_to_verify_for_zero_balance';";
$ret_code = $wpdb->query($query);
}
}
}
//-------------------------------------------------------
}
//-------------------------------------------------------
if (!$clean_address) {
// Still could not find unused virgin address. Time to generate it from scratch.
/*
Returns:
$ret_info_array = array (
'result' => 'success', // 'error'
'message' => '', // Failed to find/generate bitcoin address',
'host_reply_raw' => '', // Error. No host reply availabe.',
'generated_bitcoin_address' => '1FVai2j2FsFvCbgsy22ZbSMfUd3HLUHvKx', // false,
);
*/
$ret_addr_array = BWWC__generate_new_bitcoin_address_for_electrum_wallet($bwwc_settings, $electrum_mpk);
if ($ret_addr_array['result'] == 'success') {
$clean_address = $ret_addr_array['generated_bitcoin_address'];
$bch_cashaddr = $ret_addr_array['generated_bch_cashaddr'];
}
}
//-------------------------------------------------------
//-------------------------------------------------------
if ($clean_address) {
/*
$order_info =
array (
'order_id' => $order_id,
'order_total' => $order_total_in_btc,
'order_datetime' => date('Y-m-d H:i:s T'),
'requested_by_ip' => @$_SERVER['REMOTE_ADDR'],
);
*/
/*
$address_meta =
array (
'orders' =>
array (
// All orders placed on this address in reverse chronological order
array (
'order_id' => $order_id,
'order_total' => $order_total_in_btc,
'order_datetime' => date('Y-m-d H:i:s T'),
'requested_by_ip' => @$_SERVER['REMOTE_ADDR'],
),
array (
...
),
),
'other_meta_info' => array (...)
);
*/
// Prepare `address_meta` field for this clean address.
$address_meta = $wpdb->get_var("SELECT `address_meta` FROM `$btc_addresses_table_name` WHERE `btc_address`='$clean_address'");
$address_meta = BWWC_unserialize_address_meta($address_meta);
if (!isset($address_meta['orders']) || !is_array($address_meta['orders'])) {
$address_meta['orders'] = array();
}
array_unshift($address_meta['orders'], $order_info); // Prepend new order to array of orders
if (count($address_meta['orders']) > 10) {
array_pop($address_meta['orders']);
} // Do not keep history of more than 10 unfullfilled orders per address.
$address_meta_serialized = BWWC_serialize_address_meta($address_meta);
// Update DB with balance and timestamp, mark address as 'assigned' and return this address as clean.
//
$current_time = time();
$remote_addr = $order_info['requested_by_ip'];
$query =
"UPDATE `$btc_addresses_table_name`
SET
`total_received_funds` = '0',
`received_funds_checked_at`='$current_time',
`status`='assigned',
`assigned_at`='$current_time',
`last_assigned_to_ip`='$remote_addr',
`address_meta`='$address_meta_serialized'
WHERE `btc_address`='$clean_address';";
$ret_code = $wpdb->query($query);
$ret_info_array = array(
'result' => 'success',
'message' => "",
'host_reply_raw' => "",
'generated_bitcoin_address' => $clean_address,
'generated_bch_cashaddr' => $bch_cashaddr,
);
return $ret_info_array;
}
//-------------------------------------------------------
$ret_info_array = array(
'result' => 'error',
'message' => 'Failed to find/generate bitcoin cash address. ' . $ret_addr_array['message'],
'host_reply_raw' => $ret_addr_array['host_reply_raw'],
'generated_bitcoin_address' => false,
'generated_bch_cashaddr' => false,
);
return $ret_info_array;
}
//===========================================================================
//===========================================================================
// To accomodate for multiple MPK's and allowed key limits per MPK
function BWWC__get_next_available_mpk($bwwc_settings=false)
{
//global $wpdb;
//$btc_addresses_table_name = $wpdb->prefix . 'bwwc_btc_addresses';
// Scan DB for MPK which has number of in-use keys less than alowed limit
// ...
if (!$bwwc_settings) {
$bwwc_settings = BWWC__get_settings();
}
return @$bwwc_settings['electrum_mpks'][0];
}
//===========================================================================
//===========================================================================
/*
Returns:
$ret_info_array = array (
'result' => 'success', // 'error'
'message' => '', // Failed to find/generate bitcoin cash address',
'host_reply_raw' => '', // Error. No host reply availabe.',
'generated_bitcoin_address' => '18vzABPyVbbia8TDCKDtXJYXcoAFAPk2cj', // false,
);
*/
// If $bwwc_settings or $electrum_mpk are missing - the best attempt will be made to manifest them.
// For performance reasons it is better to pass in these vars. if available.
//
function BWWC__generate_new_bitcoin_address_for_electrum_wallet($bwwc_settings=false, $electrum_mpk=false)
{
global $wpdb;
$btc_addresses_table_name = $wpdb->prefix . 'bwwc_btc_addresses';
if (!$bwwc_settings) {
$bwwc_settings = BWWC__get_settings();
}
if (!$electrum_mpk) {
// Try to retrieve it from copy of settings.
$electrum_mpk = BWWC__get_next_available_mpk();
if (!$electrum_mpk || @$bwwc_settings['service_provider'] != 'electrum_wallet') {
// Bitcoin cash gateway settings either were not saved
$ret_info_array = array(
'result' => 'error',
'message' => 'No MPK passed and either no MPK present in copy-settings or service provider is not Electron Cash',
'host_reply_raw' => '',
'generated_bitcoin_address' => false,
'generated_bch_cashaddr' => false,
);
return $ret_info_array;
}
}
$origin_id = $electrum_mpk;
$funds_received_value_expires_in_secs = $bwwc_settings['funds_received_value_expires_in_mins'] * 60;
$assigned_address_expires_in_secs = $bwwc_settings['assigned_address_expires_in_mins'] * 60;
$clean_address = false;
$new_bch_cashaddr = false;
// Find next index to generate
$next_key_index = $wpdb->get_var("SELECT MAX(`index_in_wallet`) AS `max_index_in_wallet` FROM `$btc_addresses_table_name` WHERE `origin_id`='$origin_id';");
if ($next_key_index === null) {
$next_key_index = $bwwc_settings['starting_index_for_new_btc_addresses'];
} // Start generation of addresses from index #2 (skip two leading wallet's addresses)
else {
$next_key_index = $next_key_index+1;
} // Continue with next index
$total_new_keys_generated = 0;
$blockchains_api_failures = 0;
do {
$addresses = BWWC__MATH_generate_bitcoin_address_from_mpk($electrum_mpk, $next_key_index);
$new_btc_address = $addresses["btc_address"];
$new_bch_cashaddr = $addresses["bch_cashaddr"];
$address_request_array = array();
$address_request_array['btc_address'] = $new_btc_address;
$address_request_array['required_confirmations'] = 0;
$address_request_array['api_timeout'] = $bwwc_settings['blockchain_api_timeout_secs'];
$ret_info_array = BWWC__getreceivedbyaddress_info($address_request_array, $bwwc_settings);
$total_new_keys_generated ++;
if ($ret_info_array['balance'] === false) {
$status = 'unknown';
} elseif ($ret_info_array['balance'] == 0) {
$status = 'unused';
} // Newly generated address with freshly checked zero balance is unused and will be assigned.
else {
$status = 'used';
} // Generated address that was already used to receive money.
$funds_received = ($ret_info_array['balance'] === false)?-1:$ret_info_array['balance'];
$received_funds_checked_at_time = ($ret_info_array['balance'] === false)?0:time();
// Insert newly generated address into DB
$query =
"INSERT INTO `$btc_addresses_table_name`
(`btc_address`, `bch_cashaddr`, `origin_id`, `index_in_wallet`, `total_received_funds`, `received_funds_checked_at`, `status`) VALUES
('$new_btc_address', '$new_bch_cashaddr', '$origin_id', '$next_key_index', '$funds_received', '$received_funds_checked_at_time', '$status');";
$ret_code = $wpdb->query($query);
$next_key_index++;
if ($ret_info_array['balance'] === false) {
$blockchains_api_failures ++;
if ($blockchains_api_failures >= $bwwc_settings['max_blockchains_api_failures']) {
// Allow no more than 3 contigious blockchains API failures. After which return error reply.
$ret_info_array = array(
'result' => 'error',
'message' => $ret_info_array['message'],
'host_reply_raw' => $ret_info_array['host_reply_raw'],
'generated_bitcoin_address' => false,
'generated_bch_cashaddr' => false,
);
return $ret_info_array;
}
} else {
if ($ret_info_array['balance'] == 0) {
// Update DB with balance and timestamp, mark address as 'assigned' and return this address as clean.
$clean_address = $new_btc_address;
}
}
if ($clean_address) {
break;
}
if ($total_new_keys_generated >= $bwwc_settings['max_unusable_generated_addresses']) {
// Stop it after generating of 20 unproductive addresses.
// Something is wrong. Possibly old merchant's wallet (with many used addresses) is used for new installation. - For this case 'starting_index_for_new_btc_addresses'
// needs to be proper set to high value.
$ret_info_array = array(
'result' => 'error',
'message' => "Problem: Generated '$total_new_keys_generated' addresses and none were found to be unused. Possibly old merchant's wallet (with many used addresses) is used for new installation. If that is the case - 'starting_index_for_new_btc_addresses' needs to be proper set to high value",
'host_reply_raw' => '',
'generated_bitcoin_address' => false,
'generated_bch_cashaddr' => false,
);
return $ret_info_array;
}
} while (true);
// Here only in case of clean address.
$ret_info_array = array(
'result' => 'success',
'message' => '',
'host_reply_raw' => '',
'generated_bitcoin_address' => $clean_address,
'generated_bch_cashaddr' => $new_bch_cashaddr,
);
return $ret_info_array;
}
//===========================================================================
//===========================================================================
// Function makes sure that returned value is valid array
function BWWC_unserialize_address_meta($flat_address_meta)
{
$unserialized = @unserialize($flat_address_meta);
if (is_array($unserialized)) {
return $unserialized;
}
return array();
}
//===========================================================================
//===========================================================================
// Function makes sure that value is ready to be stored in DB
function BWWC_serialize_address_meta($address_meta_arr)
{
return BWWC__safe_string_escape(serialize($address_meta_arr));
}
//===========================================================================
//===========================================================================
/*
$address_request_array = array (
'btc_address' => '1xxxxxxx',
'required_confirmations' => '6',
'api_timeout' => 10,
);
$ret_info_array = array (
'result' => 'success',
'message' => "",
'host_reply_raw' => "",
'balance' => false == error, else - balance
);
*/
function BWWC__getreceivedbyaddress_info($address_request_array, $bwwc_settings=false)
{
// https://blockchain.bitcoinway.com/?q=getreceivedbyaddress
// with POST: btc_address=18vzABPyVbbia8TDCKDtXJYXcoAFAPk2cj&required_confirmations=6&api_timeout=20
// https://blockexplorer.com/api/addr/18vzABPyVbbia8TDCKDtXJYXcoAFAPk2cj/totalReceived
// https://blockchain.info/q/getreceivedbyaddress/18vzABPyVbbia8TDCKDtXJYXcoAFAPk2cj [?confirmations=6]
if (!$bwwc_settings) {
$bwwc_settings = BWWC__get_settings();
}
$btc_address = $address_request_array['btc_address'];
$required_confirmations = $address_request_array['required_confirmations'];
$api_timeout = $address_request_array['api_timeout'];
if ($required_confirmations) {
$confirmations_url_part_bec = ""; // No longer seems to be available
$confirmations_url_part_bci = "?confirmations=$required_confirmations";
} else {
$confirmations_url_part_bec = "";
$confirmations_url_part_bci = "";
}
$funds_received=false;
// ** disabled this url for BCH fork ** Try to get get address balance from aggregated API first to avoid excessive hits to blockchain and other services.
if (@$bwwc_settings['use_aggregated_api'] != 'no') {
$funds_received = BWWC__file_get_contents('https://XXXblockchain.XXXbitcoinway.com/?q=getreceivedbyaddress', true, $api_timeout, false, true, $address_request_array);
}
if (!is_numeric($funds_received)) {
// Help: http://blockdozer.com
$funds_received = BWWC__file_get_contents('http://blockdozer.com/insight-api/addr/' . $btc_address . '/totalReceived', true, $api_timeout);
if (!is_numeric($funds_received)) {
$blockchain_info_failure_reply = $funds_received;
// Help: https://blockexplorer.com/api
// NOTE blockexplorer API no longer has 'confirmations' parameter. Hence if blockchain.info call fails - blockchain
// will report successful transaction immediately.
$funds_received = BWWC__file_get_contents('https://bitcoincash.blockexplorer.com/api/addr/' . $btc_address . '/totalReceived', true, $api_timeout);
$blockexplorer_com_failure_reply = $funds_received;
}
}
if (is_numeric($funds_received)) {
$funds_received = sprintf("%.8f", $funds_received / 100000000.0);
}
if (is_numeric($funds_received)) {
$ret_info_array = array(
'result' => 'success',
'message' => "",
'host_reply_raw' => "",
'balance' => $funds_received,
);
} else {
$ret_info_array = array(
'result' => 'error',
'message' => "Blockchains API failure. Erratic replies:\n" . $blockexplorer_com_failure_reply . "\n" . $blockchain_info_failure_reply,
'host_reply_raw' => $blockexplorer_com_failure_reply . "\n" . $blockchain_info_failure_reply,
'balance' => false,
);
}
return $ret_info_array;
}
//===========================================================================
//===========================================================================
// Input:
// ------
// $callback_url => IPN notification URL upon received payment at generated address.
// $forwarding_bitcoin_address => Where all payments received at generated address should be ultimately forwarded to.
//
// Returns:
// --------
/*
$ret_info_array = array (
'result' => 'success', // OR 'error'
'message' => '...',
'host_reply_raw' => '......',
'generated_bitcoin_address' => '18vzABPyVbbia8TDCKDtXJYXcoAFAPk2cj', // or false
);
*/
//
function BWWC__generate_temporary_bitcoin_address__blockchain_info($forwarding_bitcoin_address, $callback_url)
{
//--------------------------------------------
// Normalize inputs.
$callback_url = urlencode(urldecode($callback_url)); // Make sure it is URL encoded.
$blockchain_api_call = "https://XXXblockchain.info/api/receive?method=create&address={$forwarding_bitcoin_address}&anonymous=false&callback={$callback_url}";
BWWC__log_event(__FILE__, __LINE__, "Calling blockchain.info API: " . $blockchain_api_call);
$result = @BWWC__file_get_contents($blockchain_api_call, true);
if ($result) {
$json_obj = @json_decode(trim($result));
if (is_object($json_obj)) {
$generated_bitcoin_address = @$json_obj->input_address;
if (strlen($generated_bitcoin_address) > 20) {
$ret_info_array = array(
'result' => 'success',
'message' => '',
'host_reply_raw' => $result,
'generated_bitcoin_address' => $generated_bitcoin_address,
);
return $ret_info_array;
}
}
}
$ret_info_array = array(
'result' => 'error',
'message' => 'Blockchain.info API failure: ' . $result,
'host_reply_raw' => $result,
'generated_bitcoin_address' => false,
);
return $ret_info_array;
}
//===========================================================================
//===========================================================================
// Returns:
// success: number of currency units (dollars, etc...) would take to convert to 1 bitcoin, ex: "15.32476".
// failure: false
//
// $currency_code, one of: USD, AUD, CAD, CHF, CNY, DKK, EUR, GBP, HKD, JPY, NZD, PLN, RUB, SEK, SGD, THB
// $rate_retrieval_method
// 'getfirst' -- pick first successfully retireved rate
// 'getall' -- retrieve from all possible exchange rate services and then pick the best rate.
//
// $get_ticker_string - true - HTML formatted text message instead of pure number returned.
function BWWC__get_exchange_rate_per_bitcoin($currency_code, $rate_retrieval_method = 'getfirst', $get_ticker_string=false)
{
if ($currency_code == 'BTC') {
return "1.00";
} // 1:1
// Do not limit support with present list of currencies. This was originally created because exchange rate APIs did not support many, but today
// they do support many more currencies, hence this check is removed for now.
// if (!@in_array($currency_code, BWWC__get_settings ('supported_currencies_arr')))
// return false;
// $blockchain_url = "http://blockchain.info/ticker";
// $bitcoincharts_url = 'http://bitcoincharts.com/t/weighted_prices.json'; // Currently not used as they are sometimes sluggish as well.
/*
24H global weighted average:
https://api.bitcoinaverage.com/ticker/global/USD/
http://api.bitcoincharts.com/v1/weighted_prices.json
Realtime:
https://api.bitcoinaverage.com/ticker/global/USD/
https://bitpay.com/api/rates
*/
$bwwc_settings = BWWC__get_settings();
$exchange_rate_type = $bwwc_settings['exchange_rate_type'];
$exchange_multiplier = $bwwc_settings['exchange_multiplier'];
if (!$exchange_multiplier) {
$exchange_multiplier = 1;
}
$current_time = time();
$cache_hit = false;
$requested_cache_method_type = $rate_retrieval_method . '|' . $exchange_rate_type;
$ticker_string = "<span style='color:#222;'>According to your settings (including multiplier), current calculated rate for 1 Bitcoin Cash (in {$currency_code})={{{EXCHANGE_RATE}}}</span>";
$ticker_string_error = "<span style='color:red;background-color:#FFA'>WARNING: Cannot determine exchange rates (for '$currency_code')! {{{ERROR_MESSAGE}}} Make sure your PHP settings are configured properly and your server can (is allowed to) connect to external WEB services via PHP.</wspan>";
$this_currency_info = @$bwwc_settings['exchange_rates'][$currency_code][$requested_cache_method_type];
if ($this_currency_info && isset($this_currency_info['time-last-checked'])) {
$delta = $current_time - $this_currency_info['time-last-checked'];
if ($delta < (@$bwwc_settings['cache_exchange_rates_for_minutes'] * 60)) {
// Exchange rates cache hit
// Use cached value as it is still fresh.
$final_rate = $this_currency_info['exchange_rate'] / $exchange_multiplier;
if ($get_ticker_string) {
return str_replace('{{{EXCHANGE_RATE}}}', $final_rate, $ticker_string);
} else {
return $final_rate;
}
}
}
$rates = array();
// bitcoinaverage covers both - vwap and realtime
$rates[] = BWWC__get_exchange_rate_from_bitcoinaverage($currency_code, $exchange_rate_type, $bwwc_settings); // Requested vwap, realtime or bestrate
if ($rates[0]) {
// First call succeeded
//comment out bitpay for now until they add bitcoincash
//if ($exchange_rate_type == 'bestrate')
// $rates[] = BWWC__get_exchange_rate_from_bitpay ($currency_code, $exchange_rate_type, $bwwc_settings); // Requested bestrate
$rates = array_filter($rates);
if (count($rates) && $rates[0]) {
$exchange_rate = min($rates);
// Save new currency exchange rate info in cache
BWWC__update_exchange_rate_cache($currency_code, $requested_cache_method_type, $exchange_rate);
} else {
$exchange_rate = false;
}
} else {
// First call failed
if ($exchange_rate_type == 'vwap') {
$rates[] = BWWC__get_exchange_rate_from_coinmarketcap($currency_code, $exchange_rate_type, $bwwc_settings);
}
//else
// $rates[] = BWWC__get_exchange_rate_from_bitpay ($currency_code, $exchange_rate_type, $bwwc_settings); // Requested bestrate
$rates = array_filter($rates);
if (count($rates)) {
$exchange_rate = min($rates);
} else {
$exchange_rate = false;
}
if ($exchange_rate) {// If array contained only meaningless data (all 'false's)
BWWC__update_exchange_rate_cache($currency_code, $requested_cache_method_type, $exchange_rate);
}
}
if ($get_ticker_string) {
if ($exchange_rate) {
return str_replace('{{{EXCHANGE_RATE}}}', $exchange_rate / $exchange_multiplier, $ticker_string);
} else {
$extra_error_message = "";
$fns = array('file_get_contents', 'curl_init', 'curl_setopt', 'curl_setopt_array', 'curl_exec');
$fns = array_filter($fns, 'BWWC__function_not_exists');
if (count($fns)) {
$extra_error_message = "The following PHP functions are disabled on your server: " . implode(", ", $fns) . ".";
}
return str_replace('{{{ERROR_MESSAGE}}}', $extra_error_message, $ticker_string_error);
}
} else {
return $exchange_rate / $exchange_multiplier;
}
}
//===========================================================================
//===========================================================================
function BWWC__function_not_exists($fname)
{
return !function_exists($fname);
}
//===========================================================================
//===========================================================================
function BWWC__update_exchange_rate_cache($currency_code, $requested_cache_method_type, $exchange_rate)
{
// Save new currency exchange rate info in cache
$bwwc_settings = BWWC__get_settings(); // Re-get settings in case other piece updated something while we were pulling exchange rate API's...
$bwwc_settings['exchange_rates'][$currency_code][$requested_cache_method_type]['time-last-checked'] = time();
$bwwc_settings['exchange_rates'][$currency_code][$requested_cache_method_type]['exchange_rate'] = $exchange_rate;
BWWC__update_settings($bwwc_settings);
}
//===========================================================================
//===========================================================================
// $rate_type: 'vwap' | 'realtime' | 'bestrate'
function BWWC__get_exchange_rate_from_bitcoinaverage($currency_code, $rate_type, $bwwc_settings)
{
$source_url = "https://apiv2.bitcoinaverage.com/indices/global/ticker/short?crypto=BCH&fiat={$currency_code}";
$result = @BWWC__file_get_contents($source_url, false, $bwwc_settings['exchange_rate_api_timeout_secs']);
$rate_obj = @json_decode(trim($result), true);
if (!is_array($rate_obj)) {
return false;
}
$json_root = 'BCH' . strtoupper($currency_code);
if (@$rate_obj[$json_root] && @$rate_obj[$json_root]['averages'] && @$rate_obj['averages']['day']) {
$rate_24h_avg = @$rate_obj[$json_root]['averages']['day'];
} elseif (@$rate_obj[$json_root]) {
$rate_24h_avg = @$rate_obj[$json_root]['last'];
}
switch ($rate_type) {
case 'vwap': return $rate_24h_avg;
case 'realtime': return @$rate_obj[$json_root]['last'];
case 'bestrate':
default: return min($rate_24h_avg, @$rate_obj['last']);
}
}
//===========================================================================
//===========================================================================
// $rate_type: 'vwap' | 'realtime' | 'bestrate'
function BWWC__get_exchange_rate_from_coinmarketcap($currency_code, $rate_type, $bwwc_settings)
{
$source_url = "https://api.coinmarketcap.com/v1/ticker/bitcoin-cash/?convert={$currency_code}";
$result = @BWWC__file_get_contents($source_url, false, $bwwc_settings['exchange_rate_api_timeout_secs']);
$rate_obj = @json_decode(trim($result), true);
if (!is_array($rate_obj)) {
return false;
}
$currency_code_tolower = strtolower($currency_code);
// Only vwap rate is available
return @$rate_obj['0']['price_' . $currency_code_tolower];
}
//===========================================================================
//===========================================================================
// $rate_type: 'vwap' | 'realtime' | 'bestrate'
function BWWC__get_exchange_rate_from_bitpay($currency_code, $rate_type, $bwwc_settings)
{
$source_url = "https://bitpay.com/api/rates";
$result = @BWWC__file_get_contents($source_url, false, $bwwc_settings['exchange_rate_api_timeout_secs']);
$rate_objs = @json_decode(trim($result), true);
if (!is_array($rate_objs)) {
return false;
}
foreach ($rate_objs as $rate_obj) {
if (@$rate_obj['code'] == $currency_code) {
return @$rate_obj['rate']; // Only realtime rate is available
}
}
return false;
}
//===========================================================================
//===========================================================================
/*
Get web page contents with the help of PHP cURL library
Success => content
Error => if ($return_content_on_error == true) $content; else FALSE;
*/
function BWWC__file_get_contents($url, $return_content_on_error=false, $timeout=60, $user_agent=false, $is_post=false, $post_data="")
{
if (!function_exists('curl_init')) {
if (!$is_post) {
$ret_val = @file_get_contents($url);
return $ret_val;
} else {
return false;
}
}
$p = substr(md5(microtime()), 24) . 'bw'; // curl post padding
$ch = curl_init();
if ($is_post) {
$new_post_data = $post_data;
if (is_array($post_data)) {
foreach ($post_data as $k => $v) {
$safetied = $v;
if (is_object($safetied)) {
$safetied = BWWC__object_to_array($safetied);
}
if (is_array($safetied)) {
$safetied = serialize($safetied);
$safetied = $p . str_replace('=', '_', BWWC__base64_encode($safetied));
$new_post_data[$k] = $safetied;
}
}
}
}
// $options = array(
// CURLOPT_URL => $url,
// CURLOPT_RETURNTRANSFER => true, // return web page
// CURLOPT_HEADER => false, // don't return headers
// CURLOPT_ENCODING => "", // handle compressed
// CURLOPT_USERAGENT => $user_agent?$user_agent:urlencode("Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.12 (KHTML, like Gecko) Chrome/9.0.576.0 Safari/534.12"), // who am i
// CURLOPT_AUTOREFERER => true, // set referer on redirect
// CURLOPT_CONNECTTIMEOUT => $timeout, // timeout on connect
// CURLOPT_TIMEOUT => $timeout, // timeout on response in seconds.
// CURLOPT_FOLLOWLOCATION => true, // follow redirects
// CURLOPT_MAXREDIRS => 10, // stop after 10 redirects
// CURLOPT_SSL_VERIFYPEER => false, // Disable SSL verification
// CURLOPT_POST => $is_post,
// CURLOPT_POSTFIELDS => $new_post_data,
// );
// if (function_exists('curl_setopt_array'))
// {
// curl_setopt_array ($ch, $options);
// }
// else
{
// To accomodate older PHP 5.0.x systems
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // return web page
curl_setopt($ch, CURLOPT_HEADER, false); // don't return headers
curl_setopt($ch, CURLOPT_ENCODING, ""); // handle compressed
curl_setopt($ch, CURLOPT_USERAGENT, $user_agent?$user_agent:urlencode("Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.12 (KHTML, like Gecko) Chrome/9.0.576.0 Safari/534.12")); // who am i
curl_setopt($ch, CURLOPT_AUTOREFERER, true); // set referer on redirect
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout); // timeout on connect
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout); // timeout on response in seconds.
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); // follow redirects
curl_setopt($ch, CURLOPT_MAXREDIRS, 10); // stop after 10 redirects
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // Disable SSL verifications
if ($is_post) {
curl_setopt($ch, CURLOPT_POST, true);
}
if ($is_post) {
curl_setopt($ch, CURLOPT_POSTFIELDS, $new_post_data);
}
}
$content = curl_exec($ch);
$err = curl_errno($ch);
$header = curl_getinfo($ch);
// $errmsg = curl_error ($ch);
curl_close($ch);
if (!$err && $header['http_code']==200) {
return trim($content);
} else {
if ($return_content_on_error) {
return trim($content);
} else {
return false;
}
}
}
//===========================================================================
//===========================================================================
function BWWC__object_to_array($object)
{
if (!is_object($object) && !is_array($object)) {
return $object;
}
return array_map('BWWC__object_to_array', (array) $object);
}
//===========================================================================
//===========================================================================
// Credits: http://www.php.net/manual/en/function.mysql-real-escape-string.php#100854
function BWWC__safe_string_escape($str="")
{
$len=strlen($str);
$escapeCount=0;
$targetString='';
for ($offset=0; $offset<$len; $offset++) {
switch ($c=$str{$offset}) {
case "'":
// Escapes this quote only if its not preceded by an unescaped backslash
if ($escapeCount % 2 == 0) {
$targetString.="\\";
}
$escapeCount=0;
$targetString.=$c;
break;
case '"':
// Escapes this quote only if its not preceded by an unescaped backslash
if ($escapeCount % 2 == 0) {
$targetString.="\\";
}
$escapeCount=0;
$targetString.=$c;
break;
case '\\':
$escapeCount++;
$targetString.=$c;
break;
default:
$escapeCount=0;
$targetString.=$c;
}
}
return $targetString;
}
//===========================================================================
//===========================================================================
// Syntax:
// BWWC__log_event (__FILE__, __LINE__, "Hi!");
// BWWC__log_event (__FILE__, __LINE__, "Hi!", "/..");
// BWWC__log_event (__FILE__, __LINE__, "Hi!", "", "another_log.php");
function BWWC__log_event($filename, $linenum, $message, $prepend_path="", $log_file_name='__log.php')
{
$log_filename = dirname(__FILE__) . $prepend_path . '/' . $log_file_name;
$logfile_header = "<?php exit(':-)'); ?>\n" . '/* =============== BitcoinWay LOG file =============== */' . "\r\n";
$logfile_tail = "\r\nEND";
// Delete too long logfiles.
//if (@file_exists ($log_filename) && filesize($log_filename)>1000000)
// unlink ($log_filename);
$filename = basename($filename);
if (@file_exists($log_filename)) {
// 'r+' non destructive R/W mode.
$fhandle = @fopen($log_filename, 'r+');
if ($fhandle) {
@fseek($fhandle, -strlen($logfile_tail), SEEK_END);
}
} else {
$fhandle = @fopen($log_filename, 'w');
if ($fhandle) {