Fix hasAccessToken check

[blackwolf12333]

When an access token is expired this plugin would not
fetch a new one. This is invalid behaviour and resulted
in failed login attempts because the token was expired,
but still passed to the javascript code as a valid token.

This patch adds a check if the token is expired as well.

[peterpeterparker]

Thx for the PR 👍

It makes sense specially for login!

Could you also improve the iOS code? If I'm not wrong, expired isn't check there too.

[blackwolf12333]

I'll have a look friday, didn't experience any issues there though.

[peterpeterparker]

Cool, keep me posted!

[blackwolf12333]

As far as I can see the iOS sdk does allow the current access token to be null, also the plugin code calls FBSDKAccessToken refreshCurrentAccessToken before attempting to login. So I think the token will never be expired?

[peterpeterparker]

That works for me. Merged and release (v6.4.0).

Thx for the PR @blackwolf12333

[nuno]

on iOS for some reason if I have the FB native app installed I can't login anymore. I tested on simulator and works just fine, means that open the web modal login.

But if the Native modal login open with text :
You already initialized a session on facebook, you want continue?

Wondering if I have something wrong.