Simple access to Firebase Realtime Database.

Everything is inside a Bucket, there you can store your items. This is for simplifying the access to your data.

You can create a Bucket with a name, a password and a list of BucketItem. You can join a Bucket with a name, a password.

1. How to use in code

2. How to setup project

3. Limitations

4. Troubleshooting

5. Last words

6. License

Define a class for the content of the Buckets, which extends BucketItem and provides an empty constructor.

data class MyData(override val id: String, val secretCodes: List<String>) : BucketItem {
    constructor() : this("", emptyList())
}

Now you can get the repository and use it, e.g. in a ViewModel.

class AViewModel : ViewModel() {
    private val fbRepo by lazy {
        FbRemoteDb(MyData::class.java).apply {
            version = "1" // Optional
        }
    }

    fun createBuckets() {
        viewModelScope.launch {
            // TODO: Here do, what you need:  fbRepo. 
        }

    }
}

The signatures are like this. Everything throws a NoUidException if there is no with FirebaseAuth logged in user. Additionally, it is your responsibility to ensure that the correct user is logged in.

@Throws(NoUidException::class)
suspend fun deleteBucketForUser(name: String): Boolean

@Throws(NoUidException::class)
suspend fun fetchBucketsList(): List<Bucket<T>>

@Throws(NoUidException::class)
suspend fun fetchBucket(name: String): Bucket<T>?

@Throws(NoUidException::class)
suspend fun updateBucket(bucket: Bucket<T>): Boolean

@Throws(NoUidException::class)
suspend fun createBucket(name: String, password: String, bucketList: List<T>): Boolean

@Throws(NoUidException::class)
suspend fun joinPublicBucket(name: String, password: String): Boolean

@Throws(NoUidException::class)
suspend fun getBucketAsFlow(name: String): Flow<Bucket<T>>?

@Throws(NoUidException::class)
suspend fun getTAsFlow(name: String, id: String): Flow<T>?

1. Add following to settings.gradle:

pluginManagement {
    plugins {
        id 'com.google.gms.google-services' version '4.3.10'
    }
}
dependencyResolutionManagement {
    repositories {
        maven { url "https://jitpack.io" }
    }
}

2. Add following to app/build.gradle:

plugins {
    id 'com.google.gms.google-services'
}
dependencies {
    implementation 'com.github.betafx:FbRemoteDb:{latest_version}'
}

3. Register your app on https://console.firebase.google.com. Download google-services.json into project.

4. Create a new Realtime Database on https://console.firebase.google.com. Change the rules to this:

{
  "rules": {
    ".read": "false",
    ".write": "false",
    "user": {
      ".read": "false",
      ".write": "false",
      "$user_id": {
        ".write": "$user_id === auth.uid",
        ".read": "$user_id === auth.uid"
      }
    },
    "buckets": {
      ".read": "false",
      ".write": "false",
      "$bucket": {
        ".read": "false",
        ".write": "false",
        "$version": {
          ".read": "false",
          ".write": "false",
          "$pw": {
            ".read": "auth.uid != null",
            ".write": "auth.uid != null"
          }
        }
      }
    }
  }
}

• Do not use this for sensitive data, seriously.
• No login mechanism, the right user has to be logged in or nothing will work.
• No server-side validation of data.
• No encryption of the data stored on the Firebase-Server. Data in database is visible for you. Implement your custom encryption and store the key on the device.
• Do not edit the database online on https://console.firebase.google.com, I don't know what will happen. Maybe your app will crash.

java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.app.myapplication. Make sure to call FirebaseApp.initializeApp(Context) first.

You forgot to add id 'com.google.gms.google-services' in app/build.gradle.

Execution failed for task ':app:processDebugGoogleServices'.
> File google-services.json is missing. The Google Services Plugin cannot function without it.

See step 3 in "How to setup project"

I was annoyed to move the same code over again, when using it in my own projects, so I decided to move it here. I am happy if you contribute, fork, clone or whatever to this repo, also opening issues is really appreciated. Feel free to contact my and happy coding :)

Copyright 2021 betafx

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