Module: Alula::JwtHelper

Defined in:
lib/alula/helpers/jwt_helper.rb

Overview

Helper class to build JWT tokens Used for internal video API calls or video API calls with a customer ID

Constant Summary collapse

ONE_HOUR = 
60 * 60

Class Method Summary collapse

Class Method Details

.add_timestamp_to_payload(payload) ⇒ Object 



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# File 'lib/alula/helpers/jwt_helper.rb', line 34

def add_timestamp_to_payload(payload)
  current_timestamp = Time.now.to_i
  payload.merge(
    {
      'iat' => current_timestamp,
      'exp' => current_timestamp + ONE_HOUR # expiry time is 60 minutes from time of creation
    }
  )
end

.build_jwt_header ⇒ Object 



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# File 'lib/alula/helpers/jwt_helper.rb', line 27

def build_jwt_header
  {
    'typ' => 'JWT',
    'alg' => 'HS256'
  }
end

.build_jwt_token(jwt_payload) ⇒ Object 



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# File 'lib/alula/helpers/jwt_helper.rb', line 11

def build_jwt_token(jwt_payload)
  jwt_secret = Alula::Client.config.video_api_key

  header = build_jwt_header

  token_data = add_timestamp_to_payload(jwt_payload)

  encoded_header = convert_to_base64(JSON.generate(header))
  encoded_data = convert_to_base64(JSON.generate(token_data))

  token = "#{encoded_header}.#{encoded_data}"
  signature = sign_token(token, jwt_secret)

  "#{token}.#{signature}"
end

.convert_to_base64(source) ⇒ Object 



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# File 'lib/alula/helpers/jwt_helper.rb', line 49

def convert_to_base64(source)
  # Encode in classical base64,
  encoded_source = Base64.strict_encode64(source)

  # Remove padding equal characters,
  encoded_source = encoded_source.gsub('=', '')

  # Replace characters according to base64url specifications,
  encoded_source.tr('+/', '-_')
end

.sign_token(token, secret) ⇒ Object 



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# File 'lib/alula/helpers/jwt_helper.rb', line 44

def sign_token(token, secret)
  signature = OpenSSL::HMAC.digest(OpenSSL::Digest.new('sha256'), secret, token)
  convert_to_base64(signature)
end