2-advanced

Advanced sandwich usage: Simple TODO app.

This example demonstrates more advanced features of sandwich, including:

• Providing interface types to the middleware chain.
  TaskDb is the interface provided to the handlers, the actual value injected in main() is a taskDbImpl.
• Using 3rd party middleware (go.auth, go.rice)
• Using a 3rd party router (gorilla/mux)
• Using multiple error handlers, and custom error handlers.
  Most web servers will want to server a custom HTML error page for user-facing error pages. An example of that is included here. For AJAX calls, however, we don't want to serve HTML. Instead, we always respond with JSON using the sandwich.. With sandwich, we the errors returned from handlers are agnostic. Instead, the error handler decides what format to respond in.
• Early exit of the middleware chain via the sandwich.Done error
  See CheckForFakeLogin() for usage.

Google Login (Oauth2 Authentication)

In order to use the Google login, you need an Oauth2 client ID & client secret. See this animation for an example of getting these values:

More documentation is available at https://developers.google.com/identity/protocols/OAuth2WebServer