Class: RubyFirebaseVerify

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

Class Method Summary collapse

Class Method Details

.verify_id_token(id_token) ⇒ Object 



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# File 'lib/ruby_firebase_verify.rb', line 7

def self.verify_id_token(id_token)
  jwt_header = JSON.parse(Base64.decode64(id_token.slice(0 .. id_token.index('.')-1)))
  client_cert_url = 'https://www.googleapis.com/robot/v1/metadata/x509/[email protected]'
  response = HTTParty.get(client_cert_url)
  certificates = JSON.parse(response.body)

  raise 'Certificate not found'  unless certificates.key?(jwt_header['kid'])
   
  x509 = OpenSSL::X509::Certificate.new(certificates[jwt_header['kid']])
  decoded_token = JWT.decode(id_token, x509.public_key, true, { algorithm: jwt_header['alg'], verify_iat: false })

  decoded_token[0]['sub']
end