JWT Enrichment

JWT enrichment allows end subscribers API requests to be enhanced with metadata stored in Revenium's platform to enable customized API responses based upon the user making the API call.

JWT Enrichment is commonly used to support use cases for which a backend application needs information stored about the Subscriber's subscription in Revenium to determine which information how to reply to a subscriber query. For example, you could use JWT enrichment to enhance a Subscriber's API call with their company name or email address to allow a backend application to match the call to a subscriber license and determine which fields to return in the API call (i.e. fields tied to a 'premium' subscription versus a 'standard' subscription'

By incorporating a custom JWT claim into metered API requests, Revenium propagates the following metadata to backend API implementations:

Field	Description
organization	The organization the invoked API / product belongs to.
consumingOrganization	The organization of the API subscriber
subscriber	The email address of the API subscriber
product	The name of the product the API belongs to
productTags	The tags associated with the product
subscriptionTags	The tags associated with the subscription
productVersion	The version of the product the API belongs to
sources	The other sources associated with the product the API belongs to
expiration	The expiration date of the subscription associated with the API subscriber
totalQuota	The quota associated with the product being invoked
consumedQuota	The amount of quota being subscribed.
subscriptionStart	The start of the subscription
subscriptionPeriodStart	The start of the current subscription period
subscriptionPeriodEnd	The end of the current subscription period

The JWT claim is propagated in the "X-HYPERCURRENT-CLAIM" header which can be parsed by the backend API implementation using any standard JWT Library.

Here is an example of a decoded Revenium JWT claim:

{
  "consumedQuota": 0,
  "product": "An API Product",
  "productTags" [
    "tag1",
    "tag2"
  ],
  "productVersion": "1.0.0",
  "assets": [
    "TA01"
  ],
  "organization": "Test Organization",
  "iss": "Revenium",
  "expiration": null,
  "totalQuota": 5000,
  "consumedQuota": 200,
  "consumingOrganization": "Test Organization",
  "consumer": "[e-mail]",
  "subscriptionStart": 1700168904000,
  "subscriptionPeriodStart": 1700168804000,
  "subscriptionPeriodEnd": 1700168904000
}

Here is Revenium's public key for JWT decoding:

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmXwrndxL7l1a3ULqTUCQ
/4uM3MjJE2RgEYlStBz4mqjgCmfFF4AMXqZSkNewiB0XlcpRlqmLYsyMok87Y6Du
Fco5isZn5ndrE2lOK3vveyEPqEMJW5yVot29IGWAn1yRXAXwI/LpZ7G6gYHerNOS
LWj3utEzuWKcTIGMjwNWTAK9nmZJLuzz3+I9D6HwVq6IAQKrLiA8GzABqVgKMPgu
nGtJhQ1iAc4WSuHl0f/xFdwZLi3FiAETayl2lGptCpLu+UOawQGo+r5metwczR1Q
RFr7mmbUqQ1HSrDax9KmHtNIhGzP6FOmH3DeEIf3ATEz0K+iXz/fencXix4PRrRP
TwIDAQAB
-----END PUBLIC KEY-----

JWT Parsing Example (Java)

The following code snippet uses the Auth0 JWT library to decode and parse a JWT:

String base64PublicKey = publicKey
        .replace("-----BEGIN PUBLIC KEY-----", "")
        .replace("-----END PUBLIC KEY-----", "")
        .replaceAll("\\s", "");

byte[] publicKeyDER = Base64.getDecoder().decode(base64PublicKey);

X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyDER);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
RSAPublicKey publicKeyInstance = (RSAPublicKey) keyFactory.generatePublic(keySpec);

// Construct the JWT verifier
Algorithm algorithm = Algorithm.RSA256(publicKeyInstance, null);
JWTVerifier verifier = JWT.require(algorithm)
        .withIssuer("HyperCurrent")
        .build();

// Decode the JWT
DecodedJWT jwt = verifier.verify(token);

// Extract claims
jwt.getClaim("organization").asString();
jwt.getClaim("consumingOrganization").asString();
...