(Ruby) Create JWT Using HS256, HS384, or HS512

Demonstrates how to create a JWT using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) When HMAC is used, the secret is a shared secret (i.e. password) that both client and server know beforehand.

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# Demonstrates how to create an HMAC JWT using a shared secret (password).

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

jwt = Chilkat::CkJwt.new()

# Build the JOSE header
jose = Chilkat::CkJsonObject.new()
# Use HS256.  Pass the string "HS384" or "HS512" to use a different algorithm.
success = jose.AppendString("alg","HS256")
success = jose.AppendString("typ","JWT")

# Now build the JWT claims (also known as the payload)
claims = Chilkat::CkJsonObject.new()
success = claims.AppendString("iss","http://example.org")
success = claims.AppendString("sub","John")
success = claims.AppendString("aud","http://example.com")

# Set the timestamp of when the JWT was created to now.
curDateTime = jwt.GenNumericDate(0)
success = claims.AddIntAt(-1,"iat",curDateTime)

# Set the "not process before" timestamp to now.
success = claims.AddIntAt(-1,"nbf",curDateTime)

# Set the timestamp defining an expiration time (end time) for the token
# to be now + 1 hour (3600 seconds)
success = claims.AddIntAt(-1,"exp",curDateTime + 3600)

# Produce the smallest possible JWT:
jwt.put_AutoCompact(true)

strJwt = jwt.createJwt(jose.emit(),claims.emit(),"secret")

print strJwt + "\n";