You might also want to examine the OpenID way, in which case you can use for example, this https://github.com/jondot/passage https://github.com/jondot/passage,

You might also want to examine the OpenID way, in which case you can use for example, this https://github.com/jondot/passage https://github.com/jondot/passage, or this https://github.com/dbloete/masquerade https://github.com/dbloete/masquerade (depending on how complex the project you want to build on)