Initial commit

lib/opendax/payload.rb

@@ -0,0 +1,46 @@
+require 'jwt'
+
+module Opendax
+
+  class Error < StandardError
+  end
+
+  class Payload
+    def initialize(params)
+      @secret = params[:secret]
+      @expire = params[:expire] || 600
+
+      raise Opendax::Error.new unless @secret
+      raise Opendax::Error.new unless @expire > 0
+    end
+
+    def generate!(params)
+      raise Opendax::Error.new unless params[:service]
+      raise Opendax::Error.new unless params[:image]
+
+      token = params.merge({
+        'iat': Time.now.to_i,
+        'exp': (Time.now + @expire).to_i
+      })
+
+      JWT.encode token, @secret, 'HS256'
+    end
+
+    def decode!(token)
+      JWT.decode(token, @secret, true, {
+        algorithm: 'HS256'
+      }).first
+    end
+
+    def safe_decode(token)
+      begin
+        decode!(token)
+      rescue JWT::ExpiredSignature
+      rescue JWT::ImmatureSignature
+      rescue JWT::VerificationError
+      rescue JWT::DecodeError
+        nil
+      end
+    end
+  end
+end