[Bug]: grade script clobbers manifestPlaceholder settings

[dtarnawsky]

What happened?

The build-extras-onesignal.gradle script is replacing entries in manifestPlaceHolders of build.gradle.

This means that if you have a entry in manifestPlaceholders called AUTH_URL_SCHEME you will get a manifestMerger error:
Manifest merger failed : Attribute data@scheme at AndroidManifest.xml requires a placeholder substitution but no value for <AUTH_URL_SCHEME> is provided.

Steps to reproduce?

1. Use the repo https://github.com/dtarnawsky/onesignal-807.git
2. npx ionic build && npx cap sync
3. npx cap run android

After build you get the error: 
Error: Attribute data@scheme at AndroidManifest.xml requires a placeholder substitution but no value for <AUTH_URL_SCHEME> is provided.

Note: If you remove onesignal-cordova-plugin then the application will run.

What did you expect to happen?

The gradle script should not alter any entries in manifestPlaceholders of build.gradle

OneSignal Cordova SDK version

onesignal-cordova-plugin 5.0.1

Which platform(s) are affected?

• iOS
• Android

Relevant log output

> Task :app:processDebugMainManifest FAILED
        /.../android/app/src/main/AndroidManifest.xml Error:
        Attribute data@scheme at AndroidManifest.xml requires a placeholder substitution but no value for
        <AUTH_URL_SCHEME> is provided.
        
        See https://developer.android.com/r/studio-ui/build/manifest-merger for more information about the manifest
        merger.
        
        
        FAILURE: Build failed with an exception.

Code of Conduct

• I agree to follow this project's Code of Conduct

[jennantilla]

@dtarnawsky thank you for reaching out! We're looking into this and will get back to you as soon as possible.

[christablogs]

Any update on this? Ionic and Onesignal are two pretty significant platforms, so I would expect paid products on both of them would integrate well together without breaking the app.

[jbw716]

Just wanted to chime in to say that we are also experiencing issues with a paid, enterprise application as a result of this.
Thanks for any updates!

[christablogs]

Any update. It's been a month so our only option is to move to another Push notification service where it will not break our app

[emawby]

I apologize for the delay we are investigating the issue

[jennantilla]

Hello everyone! A fix for this is included in our latest release, 5.0.3. Please let us know if you have any additional questions or concerns!