[SHD-160] Add tempo id provider (#6)

Add tempo id provider

lib/omniauth/nitro_id.rb

@@ -2,3 +2,4 @@
 
 require "omniauth/nitro_id/version"
 require "omniauth/strategies/nitro_id"
+require "omniauth/strategies/tempo_id"

lib/omniauth/strategies/tempo_id.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require "omniauth_openid_connect"
+
+module OmniAuth
+  module Strategies
+    class TempoId < OmniAuth::Strategies::OpenIDConnect
+      DEFAULT_STRATEGY_NAME = "tempo_id"
+      DEFAULT_ISSUER = "https://id.streamfinancial.io/"
+      DEFAULT_HOST = "id.streamfinancial.io"
+
+      option :name, DEFAULT_STRATEGY_NAME
+      option :discovery, true
+      option :issuer, DEFAULT_ISSUER
+      option :client_options, host: DEFAULT_HOST
+    end
+  end
+end

spec/omniauth/strategies/tempo_id_spec.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+describe OmniAuth::Strategies::TempoId do
+  let(:access_token) { instance_double("AccessToken", :options => {}, :[] => "user") }
+  let(:custom_client) do
+    OmniAuth::Strategies::TempoId.new(:test_app,
+                                      issuer: "https://example-host.com/",
+                                      discovery: false,
+                                      client_options: {
+                                        host: "example-host.com",
+                                      })
+  end
+
+  subject do
+    OmniAuth::Strategies::TempoId.new({})
+  end
+
+  before(:each) do
+    allow(subject).to receive(:access_token).and_return(access_token)
+  end
+
+  context "options" do
+    it "should have correct name" do
+      expect(subject.options.name).to eq "tempo_id"
+    end
+
+    it "should have correct host" do
+      expect(subject.options.client_options.host).to eq "id.streamfinancial.io"
+    end
+
+    it "should have correct issuer" do
+      expect(subject.options.issuer).to eq "https://id.streamfinancial.io/"
+    end
+
+    it "should have the correct discovery setting" do
+      expect(subject.options.discovery).to eq true
+    end
+
+    describe "should be overrideable" do
+      it "for host" do
+        expect(custom_client.options.client_options.host).to eq "example-host.com"
+      end
+
+      it "for issuer" do
+        expect(custom_client.options.issuer).to eq "https://example-host.com/"
+      end
+
+      it "for discovery" do
+        expect(custom_client.options.discovery).to eq false
+      end
+    end
+  end
+end