Class: JwtAuthCognito::JwksService

Inherits:
Object
  • Object
show all
Defined in:
lib/jwt_auth_cognito/jwks_service.rb

Instance Method Summary collapse

Constructor Details

#initialize(config = JwtAuthCognito.configuration) ⇒ JwksService

Returns a new instance of JwksService.



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# File 'lib/jwt_auth_cognito/jwks_service.rb', line 11

def initialize(config = JwtAuthCognito.configuration)
  @config = config
  @cache = {}
  @cache_timestamps = {}
end

Instance Method Details

#validate_token_with_jwks(token) ⇒ Object 



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# File 'lib/jwt_auth_cognito/jwks_service.rb', line 17

def validate_token_with_jwks(token)
  @config.validate!

  header = JWT.decode(token, nil, false).last
  kid = header['kid']

  raise ValidationError, 'Token missing key ID (kid)' unless kid

  public_key = get_public_key(kid)
  # First decode to check token type before audience validation
  payload_preview = JWT.decode(token, nil, false).first

  # Only verify audience for ID tokens, not access tokens
  # Access tokens from Cognito might not have 'aud' claim
  should_verify_aud = @config.cognito_client_id && payload_preview['token_use'] == 'id'

  decoded_token = JWT.decode(
    token,
    public_key,
    true,
    {
      algorithm: 'RS256',
      iss: @config.cognito_issuer,
      verify_iss: true,
      aud: should_verify_aud ? @config.cognito_client_id : nil,
      verify_aud: should_verify_aud
    }
  )

  payload = decoded_token.first
  validate_token_claims(payload)

  {
    valid: true,
    payload: payload,
    sub: payload['sub'],
    username: payload['cognito:username'] || payload['username'],
    token_use: payload['token_use']
  }
rescue JWT::DecodeError => e
  { valid: false, error: "JWT decode error: #{e.message}" }
rescue ValidationError => e
  { valid: false, error: e.message }
rescue StandardError => e
  { valid: false, error: "Validation error: #{e.message}" }
end