Add Apple Music integration for now playing

slices/admin/views/apple_music/index.rb

@@ -0,0 +1,29 @@
+require "jwt"
+
+module Admin
+  module Views
+    module AppleMusic
+      class Index < Admin::View
+        include Deps["settings"]
+
+        expose :developer_token do
+          authentication_payload = {
+            iss: settings.apple_music_team,
+            iat: Time.now.to_i,         # Issue date
+            exp: Time.now.to_i + 3600   # Expiry of this token.
+          }
+          # The file we got from Apple
+          apple_music_secret = File.read(File.join(Hanami.app.root, "config", "AuthKey_#{settings.apple_music_key}.p8"))
+          private_key = OpenSSL::PKey::EC.new(apple_music_secret)
+
+          JWT.encode(
+            authentication_payload,
+            private_key,
+            'ES256',
+            kid: settings.apple_music_key
+          )
+        end
+      end
+    end
+  end
+end