cp-sumi-k

/** payload data **/
payload := &NotificationPayload{}

_, err = jwt.ParseWithClaims(tokenStr, payload, func(token *jwt.Token) (interface{}, error) {
		return extractPublicKeyFromToken(tokenStr)
})


/** transaction info **/
transactionInfo := &TransactionInfo{}

cp-sumi-k

        // Notification signed payload
	type NotificationPayload struct {
		jwt.StandardClaims
		NotificationType    string           `json:"notificationType"`
		Subtype             string           `json:"subtype"`
		NotificationUUID    string           `json:"notificationUUID"`
		NotificationVersion string           `json:"notificationVersion"`
		Data                NotificationData `json:"data"`
	}

cp-sumi-k

func extractPublicKeyFromToken(tokenStr string) (*ecdsa.PublicKey, error) {
  
	certStr, err := extractHeaderByIndex(tokenStr, 0)  // get certificate from X5c[0] header
	if err != nil {
		return nil, err
	}

	cert, err := x509.ParseCertificate(certStr)  // parse certificate
	if err != nil {
		return nil, err

cp-sumi-k

func verifyCert(certByte []byte, intermediateCert []byte) error {
  
	roots := x509.NewCertPool()  // new empty set of certificate pool
  
	ok := roots.AppendCertsFromPEM([]byte(APP_STORE_NOTIFICATION_ROOT_CERT))  // parse and append app store certificate to certPool
	if !ok {
		return errors.New("failed to parse root certificate")
	}
	
	interCert, err := x509.ParseCertificate(intermediateCert)  // parse and append intermediate X5c certificate

cp-sumi-k

// prepare header structure contains algorithm and token type
type NotificationHeader struct {
	Alg string   `json:"alg"`
	X5c []string `json:"x5c"`
}

// extract header from given JWS formatted token
func extractHeaderByIndex(tokenStr string, index int) ([]byte, error) {

	tokenArr := strings.Split(tokenStr, ".")  // get header from token

cp-sumi-k

<?php

$text = "\xE0";
echo utf8_decode($text);

# output : ?

?>

cp-sumi-k

<?php

$text = "\xE0";
echo utf8_encode($text);

# output : à

?>

cp-sumi-k

<?php

# encode

echo str_rot13("We celebrate differences!!");
# Output 1 : Jr pryroengr qvssreraprf!!


# decode

cp-sumi-k

<?php

# Example 1 (Associative array)

$users = '[{"id":"1","name":"John"},{"id":"2","name":"Michel"}]';
var_dump(json_decode($users));

/* 
output: array(2) { [0]=> object(stdClass)#1 (2) { ["id"]=> string(1) "1" ["name"]=> string(4) "John" } 
                   [1]=> object(stdClass)#2 (2) { ["id"]=> string(1) "2" ["name"]=> string(6) "Michel" } 

cp-sumi-k

<?php

# Example 1 (Associative array)

$users = array(array("id"=>"1", "name"=>"John"), array("id"=>"2", "name"=>"Michel"));
echo json_encode($users);

# output: [{"id":"1","name":"John"},{"id":"2","name":"Michel"}]