diff --git a/.gitignore b/.gitignore
index 67599524b..fb4875a9a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,10 @@ pkg
 specdoc
 wiki
 .google-api.yaml
+*.log
+
+#IntelliJ
+.idea
+*.iml
+atlassian*
+
diff --git a/lib/google/api_client/auth/file_storage.rb b/lib/google/api_client/auth/file_storage.rb
index fca4ea39a..1562bedf8 100644
--- a/lib/google/api_client/auth/file_storage.rb
+++ b/lib/google/api_client/auth/file_storage.rb
@@ -12,47 +12,39 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-require 'json'
 require 'signet/oauth_2/client'
+require_relative 'storage'
+require_relative 'storages/file_store'
 
 module Google
   class APIClient
+
     ##
     # Represents cached OAuth 2 tokens stored on local disk in a
     # JSON serialized file. Meant to resemble the serialized format
     # http://google-api-python-client.googlecode.com/hg/docs/epy/oauth2client.file.Storage-class.html
     #
+    # @deprecated
+    #  Use {Google::APIClient::Storage} and {Google::APIClient::FileStore} instead
+    #
     class FileStorage
-      # @return [String] Path to the credentials file.
-      attr_accessor :path
 
-      # @return [Signet::OAuth2::Client] Path to the credentials file.
-      attr_reader :authorization
+      attr_accessor :storage,
+                    :path
 
-      ##
-      # Initializes the FileStorage object.
-      #
-      # @param [String] path
-      #    Path to the credentials file.
       def initialize(path)
         @path = path
-        self.load_credentials
+        store = Google::APIClient::FileStore.new(@path)
+        @storage = Google::APIClient::Storage.new(store)
+        @storage.authorize
       end
 
-      ##
-      # Attempt to read in credentials from the specified file.
       def load_credentials
-        if File.exists? self.path
-          File.open(self.path, 'r') do |file|
-            cached_credentials = JSON.load(file)
-            @authorization = Signet::OAuth2::Client.new(cached_credentials)
-            @authorization.issued_at = Time.at(cached_credentials['issued_at'])
-            if @authorization.expired?
-              @authorization.fetch_access_token!
-              self.write_credentials
-            end
-          end
-        end
+        storage.authorize
+      end
+
+      def authorization
+        storage.authorization
       end
 
       ##
@@ -61,26 +53,9 @@ module Google
       # @param [Signet::OAuth2::Client] authorization
       #    Optional authorization instance. If not provided, the authorization
       #    already associated with this instance will be written.
-      def write_credentials(authorization=nil)
-        @authorization = authorization unless authorization.nil?
-
-        unless @authorization.refresh_token.nil?
-          hash = {}
-          %w'access_token
-           authorization_uri
-           client_id
-           client_secret
-           expires_in
-           refresh_token
-           token_credential_uri'.each do |var|
-            hash[var] = @authorization.instance_variable_get("@#{var}")
-          end
-          hash['issued_at'] = @authorization.issued_at.to_i
-
-          File.open(self.path, 'w', 0600) do |file|
-            file.write(hash.to_json)
-          end
-        end
+      def write_credentials(auth=nil)
+        self.authorization = auth unless auth.nil?
+        storage.write_credentials(self.authorization)
       end
     end
   end
diff --git a/lib/google/api_client/auth/storage.rb b/lib/google/api_client/auth/storage.rb
new file mode 100644
index 000000000..e7cc5bc4e
--- /dev/null
+++ b/lib/google/api_client/auth/storage.rb
@@ -0,0 +1,101 @@
+# Copyright 2013 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require 'signet/oauth_2/client'
+
+module Google
+  class APIClient
+    ##
+    # Represents cached OAuth 2 tokens stored on local disk in a
+    # JSON serialized file. Meant to resemble the serialized format
+    # http://google-api-python-client.googlecode.com/hg/docs/epy/oauth2client.file.Storage-class.html
+    #
+    class Storage
+
+      AUTHORIZATION_URI = 'https://accounts.google.com/o/oauth2/auth'
+      TOKEN_CREDENTIAL_URI = 'https://accounts.google.com/o/oauth2/token'
+
+      # @return [Object] Storage object.
+      attr_accessor :store
+
+      # @return [Signet::OAuth2::Client]
+      attr_reader :authorization
+
+      ##
+      # Initializes the Storage object.
+      #
+      # @params [Object] Storage object
+      def initialize(store)
+        @store= store
+      end
+
+      ##
+      # Write the credentials to the specified store.
+      #
+      # @params [Signet::OAuth2::Client] authorization
+      #    Optional authorization instance. If not provided, the authorization
+      #    already associated with this instance will be written.
+      def write_credentials(authorization=nil)
+        @authorization = authorization if authorization
+        if @authorization.respond_to?(:refresh_token) && @authorization.refresh_token
+          store.write_credentials(credentials_hash)
+        end
+      end
+
+      ##
+      # Loads credentials and authorizes an client.
+      # @return [Object] Signet::OAuth2::Client or NIL
+      def authorize
+        @authorization = nil
+        cached_credentials = load_credentials
+        if cached_credentials && cached_credentials.size > 0
+          @authorization = Signet::OAuth2::Client.new(cached_credentials)
+          @authorization.issued_at = Time.at(cached_credentials['issued_at'].to_i)
+          self.refresh_authorization if @authorization.expired?
+        end
+        return @authorization
+      end
+
+      ##
+      # refresh credentials and save them to store
+      def refresh_authorization
+        authorization.refresh!
+        self.write_credentials
+      end
+
+      private
+
+      ##
+      # Attempt to read in credentials from the specified store.
+      def load_credentials
+        store.load_credentials
+      end
+
+      ##
+      # @return [Hash] with credentials
+      def credentials_hash
+        {
+          :access_token          => authorization.access_token,
+          :authorization_uri     => AUTHORIZATION_URI,
+          :client_id             => authorization.client_id,
+          :client_secret         => authorization.client_secret,
+          :expires_in            => authorization.expires_in,
+          :refresh_token         => authorization.refresh_token,
+          :token_credential_uri  => TOKEN_CREDENTIAL_URI,
+          :issued_at             => authorization.issued_at.to_i
+        }
+      end
+    end
+  end
+end
diff --git a/lib/google/api_client/auth/storages/file_store.rb b/lib/google/api_client/auth/storages/file_store.rb
new file mode 100644
index 000000000..cd3eae710
--- /dev/null
+++ b/lib/google/api_client/auth/storages/file_store.rb
@@ -0,0 +1,58 @@
+# Copyright 2013 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require 'json'
+
+module Google
+  class APIClient
+    ##
+    # Represents cached OAuth 2 tokens stored on local disk in a
+    # JSON serialized file. Meant to resemble the serialized format
+    # http://google-api-python-client.googlecode.com/hg/docs/epy/oauth2client.file.Storage-class.html
+    #
+    class FileStore
+
+      attr_accessor :path
+
+      ##
+      # Initializes the FileStorage object.
+      #
+      # @param [String] path
+      #    Path to the credentials file.
+      def initialize(path)
+        @path= path
+      end
+
+      ##
+      # Attempt to read in credentials from the specified file.
+      def load_credentials
+        open(path, 'r') { |f| JSON.parse(f.read) }
+      rescue
+        nil
+      end
+
+      ##
+      # Write the credentials to the specified file.
+      #
+      # @param [Signet::OAuth2::Client] authorization
+      #    Optional authorization instance. If not provided, the authorization
+      #    already associated with this instance will be written.
+      def write_credentials(credentials_hash)
+        open(self.path, 'w+') do |f|
+          f.write(credentials_hash.to_json)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/google/api_client/auth/storages/redis_store.rb b/lib/google/api_client/auth/storages/redis_store.rb
new file mode 100644
index 000000000..3f76f7ca8
--- /dev/null
+++ b/lib/google/api_client/auth/storages/redis_store.rb
@@ -0,0 +1,54 @@
+# Copyright 2013 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require 'json'
+
+module Google
+  class APIClient
+    class RedisStore
+
+      DEFAULT_REDIS_CREDENTIALS_KEY = "google_api_credentials"
+
+      attr_accessor :redis
+
+      ##
+      # Initializes the RedisStore object.
+      #
+      # @params [Object] Redis instance
+      def initialize(redis, key = nil)
+        @redis= redis
+        @redis_credentials_key = key
+      end
+
+      ##
+      # Attempt to read in credentials from redis.
+      def load_credentials
+        credentials = redis.get redis_credentials_key
+        JSON.parse(credentials) if credentials
+      end
+
+      def redis_credentials_key
+        @redis_credentials_key || DEFAULT_REDIS_CREDENTIALS_KEY
+      end
+
+      ##
+      # Write the credentials to redis.
+      #
+      # @params [Hash] credentials
+      def write_credentials(credentials_hash)
+        redis.set(redis_credentials_key, credentials_hash.to_json)
+      end
+    end
+  end
+end
diff --git a/lib/google/api_client/service_account.rb b/lib/google/api_client/service_account.rb
index b6a0b3cb0..3d941ae07 100644
--- a/lib/google/api_client/service_account.rb
+++ b/lib/google/api_client/service_account.rb
@@ -16,3 +16,6 @@ require 'google/api_client/auth/pkcs12'
 require 'google/api_client/auth/jwt_asserter'
 require 'google/api_client/auth/key_utils'
 require 'google/api_client/auth/compute_service_account'
+require 'google/api_client/auth/storage'
+require 'google/api_client/auth/storages/redis_store'
+require 'google/api_client/auth/storages/file_store'
diff --git a/spec/fixtures/files/auth_stored_credentials.json b/spec/fixtures/files/auth_stored_credentials.json
new file mode 100644
index 000000000..4cd786e4a
--- /dev/null
+++ b/spec/fixtures/files/auth_stored_credentials.json
@@ -0,0 +1,8 @@
+{   "access_token":"access_token_123456789",
+    "authorization_uri":"https://accounts.google.com/o/oauth2/auth",
+    "client_id":"123456789p.apps.googleusercontent.com",
+    "client_secret":"very_secret",
+    "expires_in":3600,
+    "refresh_token":"refresh_token_12345679",
+    "token_credential_uri":"https://accounts.google.com/o/oauth2/token",
+    "issued_at":1386053761}
\ No newline at end of file
diff --git a/spec/google/api_client/auth/storage_spec.rb b/spec/google/api_client/auth/storage_spec.rb
new file mode 100644
index 000000000..d8e5b960c
--- /dev/null
+++ b/spec/google/api_client/auth/storage_spec.rb
@@ -0,0 +1,122 @@
+require 'spec_helper'
+
+require 'google/api_client'
+require 'google/api_client/version'
+
+describe Google::APIClient::Storage do
+  let(:client) { Google::APIClient.new(:application_name => 'API Client Tests') }
+  let(:root_path) { File.expand_path(File.join(__FILE__, '..', '..', '..')) }
+  let(:json_file) { File.expand_path(File.join(root_path, 'fixtures', 'files', 'auth_stored_credentials.json')) }
+
+  let(:store) { double }
+  let(:client_stub) { double }
+  subject { Google::APIClient::Storage.new(store) }
+
+  describe 'authorize' do
+    it 'should authorize' do
+      expect(subject).to respond_to(:authorization)
+      expect(subject.store).to be == store
+    end
+  end
+
+  describe 'authorize' do
+    describe 'with credentials' do
+
+      it 'should initialize a new OAuth Client' do
+        expect(subject).to receive(:load_credentials).and_return({:first => 'a dummy'})
+        expect(client_stub).to receive(:issued_at=)
+        expect(client_stub).to receive(:expired?).and_return(false)
+        expect(Signet::OAuth2::Client).to receive(:new).and_return(client_stub)
+        expect(subject).not_to receive(:refresh_authorization)
+        subject.authorize
+      end
+
+      it 'should refresh authorization' do
+        expect(subject).to receive(:load_credentials).and_return({:first => 'a dummy'})
+        expect(client_stub).to receive(:issued_at=)
+        expect(client_stub).to receive(:expired?).and_return(true)
+        expect(Signet::OAuth2::Client).to receive(:new).and_return(client_stub)
+        expect(subject).to receive(:refresh_authorization)
+        auth = subject.authorize
+        expect(auth).to be == subject.authorization
+        expect(auth).not_to be_nil
+      end
+    end
+
+    describe 'without credentials' do
+
+      it 'should return nil' do
+        expect(subject.authorization).to be_nil
+        expect(subject).to receive(:load_credentials).and_return({})
+        expect(subject.authorize).to be_nil
+        expect(subject.authorization).to be_nil
+      end
+    end
+  end
+
+  describe 'write_credentials' do
+    it 'should call store to write credentials' do
+      authorization_stub = double
+      expect(authorization_stub).to receive(:refresh_token).and_return(true)
+      expect(subject).to receive(:credentials_hash)
+      expect(subject.store).to receive(:write_credentials)
+      subject.write_credentials(authorization_stub)
+      expect(subject.authorization).to be == authorization_stub
+    end
+
+    it 'should not call store to write credentials' do
+      expect(subject).not_to receive(:credentials_hash)
+      expect(subject.store).not_to receive(:write_credentials)
+      expect {
+        subject.write_credentials()
+      }.not_to raise_error
+    end
+    it 'should not call store to write credentials' do
+      expect(subject).not_to receive(:credentials_hash)
+      expect(subject.store).not_to receive(:write_credentials)
+      expect {
+        subject.write_credentials('something')
+      }.not_to raise_error
+    end
+
+  end
+
+  describe 'refresh_authorization' do
+    it 'should call refresh and write credentials' do
+      expect(subject).to receive(:write_credentials)
+      authorization_stub = double
+      expect(subject).to receive(:authorization).and_return(authorization_stub)
+      expect(authorization_stub).to receive(:refresh!).and_return(true)
+      subject.refresh_authorization
+    end
+  end
+
+  describe 'load_credentials' do
+    it 'should call store to load credentials' do
+      expect(subject.store).to receive(:load_credentials)
+      subject.send(:load_credentials)
+    end
+  end
+
+  describe 'credentials_hash' do
+    it 'should return an hash' do
+      authorization_stub = double
+      expect(authorization_stub).to receive(:access_token)
+      expect(authorization_stub).to receive(:client_id)
+      expect(authorization_stub).to receive(:client_secret)
+      expect(authorization_stub).to receive(:expires_in)
+      expect(authorization_stub).to receive(:refresh_token)
+      expect(authorization_stub).to receive(:issued_at).and_return('100')
+      allow(subject).to receive(:authorization).and_return(authorization_stub)
+      credentials = subject.send(:credentials_hash)
+      expect(credentials).to include(:access_token)
+      expect(credentials).to include(:authorization_uri)
+      expect(credentials).to include(:client_id)
+      expect(credentials).to include(:client_secret)
+      expect(credentials).to include(:expires_in)
+      expect(credentials).to include(:refresh_token)
+      expect(credentials).to include(:token_credential_uri)
+      expect(credentials).to include(:issued_at)
+    end
+  end
+end
diff --git a/spec/google/api_client/auth/storages/file_store_spec.rb b/spec/google/api_client/auth/storages/file_store_spec.rb
new file mode 100644
index 000000000..2963b1d45
--- /dev/null
+++ b/spec/google/api_client/auth/storages/file_store_spec.rb
@@ -0,0 +1,40 @@
+require 'spec_helper'
+
+require 'google/api_client'
+require 'google/api_client/version'
+
+describe Google::APIClient::FileStore do
+  let(:root_path) { File.expand_path(File.join(__FILE__, '..','..','..', '..','..')) }
+  let(:json_file) { File.expand_path(File.join(root_path, 'fixtures', 'files', 'auth_stored_credentials.json')) }
+
+  let(:credentials_hash) {{
+      "access_token"=>"my_access_token",
+      "authorization_uri"=>"https://accounts.google.com/o/oauth2/auth",
+      "client_id"=>"123456_test_client_id@.apps.googleusercontent.com",
+      "client_secret"=>"123456_client_secret",
+      "expires_in"=>3600,
+      "refresh_token"=>"my_refresh_token",
+      "token_credential_uri"=>"https://accounts.google.com/o/oauth2/token",
+      "issued_at"=>1384440275
+  }}
+
+  subject{Google::APIClient::FileStore.new('a file path')}
+
+  it 'should have a path' do
+    expect(subject.path).to be == 'a file path'
+    subject.path = 'an other file path'
+    expect(subject.path).to be == 'an other file path'
+  end
+
+  it 'should load credentials' do
+    subject.path = json_file
+    credentials = subject.load_credentials
+    expect(credentials).to include('access_token', 'authorization_uri', 'refresh_token')
+  end
+
+  it 'should write credentials' do
+    io_stub = StringIO.new
+    expect(subject).to receive(:open).and_return(io_stub)
+    subject.write_credentials(credentials_hash)
+  end
+end
diff --git a/spec/google/api_client/auth/storages/redis_store_spec.rb b/spec/google/api_client/auth/storages/redis_store_spec.rb
new file mode 100644
index 000000000..de5abc4a1
--- /dev/null
+++ b/spec/google/api_client/auth/storages/redis_store_spec.rb
@@ -0,0 +1,70 @@
+require 'spec_helper'
+
+require 'google/api_client'
+require 'google/api_client/version'
+
+
+describe Google::APIClient::RedisStore do
+  let(:root_path) { File.expand_path(File.join(__FILE__, '..', '..', '..', '..', '..')) }
+  let(:json_file) { File.expand_path(File.join(root_path, 'fixtures', 'files', 'auth_stored_credentials.json')) }
+  let(:redis) {double}
+
+  let(:credentials_hash) { {
+      "access_token" => "my_access_token",
+      "authorization_uri" => "https://accounts.google.com/o/oauth2/auth",
+      "client_id" => "123456_test_client_id@.apps.googleusercontent.com",
+      "client_secret" => "123456_client_secret",
+      "expires_in" => 3600,
+      "refresh_token" => "my_refresh_token",
+      "token_credential_uri" => "https://accounts.google.com/o/oauth2/token",
+      "issued_at" => 1384440275
+  } }
+
+  subject { Google::APIClient::RedisStore.new('a redis instance') }
+
+  it 'should have a redis instance' do
+    expect(subject.redis).to be == 'a redis instance'
+    subject.redis = 'an other redis instance'
+    expect(subject.redis).to be == 'an other redis instance'
+  end
+
+  describe 'load_credentials' do
+
+    it 'should load credentials' do
+      subject.redis= redis
+      expect(redis).to receive(:get).and_return(credentials_hash.to_json)
+      expect(subject.load_credentials).to be == credentials_hash
+    end
+
+    it 'should return nil' do
+      subject.redis= redis
+      expect(redis).to receive(:get).and_return(nil)
+      expect(subject.load_credentials).to be_nil
+    end
+  end
+
+  describe 'redis_credentials_key' do
+    context 'without given key' do
+      it 'should return default key' do
+        expect(subject.redis_credentials_key).to be == "google_api_credentials"
+      end
+    end
+    context 'with given key' do
+      let(:redis_store) { Google::APIClient::RedisStore.new('a redis instance', 'another_google_api_credentials') }
+      it 'should use given key' do
+        expect(redis_store.redis_credentials_key).to be == "another_google_api_credentials"
+      end
+    end
+
+  end
+
+  describe 'write credentials' do
+
+    it 'should write credentials' do
+      subject.redis= redis
+      expect(redis).to receive(:set).and_return('ok')
+      expect(subject.write_credentials(credentials_hash)).to be_truthy
+    end
+  end
+
+end