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JWT Claims

Verification of a JWT (JSON Web Token) Claims Set for Ruby

Description

A Ruby implementation of the JSON Web Token (JWT) registered claims, RFC 7519

Installation

gem install jwt_claims

Usage

JwtClaims.verify(jwt, options)

Returns a hash, either:

{:ok, claims}, a JWT claims set hash, if the JWT Message Authentication Code (MAC), or signature, is verified and the registered claims are also verified
{:error, [rejected_claims]}, a list of any registered claims that fail validation, if the JWT MAC is verified
{:error, 'invalid JWT'} if the JWT MAC is not verified
{:error, 'invalid input'} otherwise

jwt (required) is a JSON web token string

options (required) hash

alg (optional, default: 'HS256')
key (required unless alg is 'none')

Please refer to the JSON Web Token gem for additional guidance regarding JWT options

Example

# An example using the 'Expires' `exp` claim (10 years for this example).
> jwt = JsonWebToken.sign({foo: 'bar', exp: Time.now.to_i + 315360000}, key: 'gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr9C')
#=> "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJmb28iOiJiYXIiLCJleHAiOjE3OTEyMjc1MTl9.7cT7PzsT8Jv0VQIxokjk3sUqzJCxBR4h3W2uACQ-tW0"

# Verify with default algorithm, HMAC SHA256
# Returns a hash of `{:ok, verified_claims}`
> JwtClaims.verify(jwt, key: 'gZH75aKtMN3Yj0iPS4hcgUuTwjAzZr9C')
#=> {:ok=>{:foo=>"bar", :exp=>1475870843}}

Supported registered claims

JWT claim	key	a valid claim value must
Issuer	:iss	equal options[:iss]
Subject	:sub	equal options[:sub]
Audience	:aud	include options[:aud]
Expiration Time	:exp	be > current time
Not Before	:nbf	be <= current time
Issued at	:iat	be < current time
JWT ID	:jti	equal options[:jti]

Additional detail about JWT registered claims is found in this section of the JWT RFC

Supported Ruby versions

Ruby 2.0.0 and up