/**
* Generates, encodes, re-orders variables for the query string.
*
* @param array $params The specific parameters for this payment
* @param array $pairs Pairs
* @param string $namespace The namespace
*
* @return string An encoded string of parameters
*/
public static function generate_query_string($params, &$pairs = array(), $namespace = null)
{
if (is_array($params)) {
foreach ($params as $k => $v) {
if (is_int($k)) {
GoCardless_Utils::generate_query_string($v, $pairs, $namespace . '[]');
} else {
GoCardless_Utils::generate_query_string($v, $pairs, $namespace !== null ? $namespace . "[{$k}]" : $k);
}
}
if ($namespace !== null) {
return $pairs;
}
if (empty($pairs)) {
return '';
}
usort($pairs, array(__CLASS__, 'sortPairs'));
$strs = array();
foreach ($pairs as $pair) {
$strs[] = $pair[0] . '=' . $pair[1];
}
return implode('&', $strs);
} else {
$pairs[] = array(rawurlencode($namespace), rawurlencode($params));
}
}
/**
* Generate a new payment url
*
* @param string $type Payment type
* @param string $params The specific parameters for this payment
*
* @return string The new payment URL
*/
public function new_limit_url($type, $params)
{
// $params are passed in
// Optional $params are saved in $request and removed from $params
// $params now only contains params for the payments
// $payment_params is created containing sub-object named after $type
// Merge $payment_params, $request and mandatory params
// Sign
// Generate query string
// Return resulting url
// Declare empty array
$request = array();
// Add in merchant id
$params['merchant_id'] = $this->account_details['merchant_id'];
// Define optional parameters
$opt_params = array('redirect_uri', 'cancel_uri', 'state');
// Loop through optional parameters
foreach ($opt_params as $opt_param) {
if (isset($params[$opt_param])) {
$request[$opt_param] = $params[$opt_param];
unset($params[$opt_param]);
}
}
// If no method-specific redirect submitted then
// use class level if available
if (!isset($request['redirect_uri']) && isset($this->redirect_uri)) {
$request['redirect_uri'] = $this->redirect_uri;
}
// Create array of payment params
$payment_params = array($type => $params);
// Put together all the bits: passed params inc payment params & mandatory
$request = array_merge($request, $payment_params, $this->generate_mandatory_params());
// Generate signature
$request['signature'] = GoCardless_Utils::generate_signature($request, $this->account_details['app_secret']);
// Generate query string from all parameters
$query_string = GoCardless_Utils::generate_query_string($request);
// Generate url NB. Pluralises resource
return $this->base_url . '/connect/' . $type . 's/new?' . $query_string;
}
