feat: AppCheck support

[jjgriff93]

Is your feature request related to a problem? Please describe:
Loving this library thus far. It would be incredibly useful to have a--check support in this library (there's only one capacitor alternative currently and that isn't being maintained and isn't compatible with Cap 4: https://github.com/mattmilan-dev/capacitor-firebase-appcheck

Describe the solution you'd like:
Similarly to the linked library, I would like to be able to access native firebase appcheck along with the tokens it issues from within my Capacitor application. I currently use AngularFire and when initialising appcheck on the web layer I access the native token as a CustomProvider during module bootstrapping:

// Initialise AppCheck natively if running on iOS or Android
      if (Capacitor.isNativePlatform()) {
        AppCheck.initialize({ debug: isDevMode() });
        // Use CustomProvider to get native AppCheck token
        provider = new CustomProvider({
          getToken: async () => {
            const { token, exp: expireTimeMillis } =
              await AppCheck.getAppCheckToken();
            return { token, expireTimeMillis };
          }
        });
        // Or use ReCAPTCHAv3 if running in web
      } else {

Thanks! Goes without saying that I'm happy to help implement or provide further info

[robingenz]

Great feature request! This plugin is still missing.

Thanks! Goes without saying that I'm happy to help implement or provide further info

If you want, you can do the implementation. I would then create the boilerplate code for the new package and prepare everything.
Just let me know.

[phoheisel]

I would love to see that! Is there any other known way to get app check running witch cap4?

[robingenz]

I am currently not aware of any. The plugin is still planned but I currently have little free time.

[jjgriff93]

Hello guys, sorry for the delay but I have put together an implementation for this and opened a PR (#237), let me know what you think (and please test it)! @robingenz

[robingenz]

A first dev version is now available for testing:

npm i @capacitor-firebase/app-check@1.2.0-dev.c2371d8.1667689388