ozone

Overview

The Ozone project for the AT Protocol consists of several components:

1. A Gradle plugin to compile AT Protocol schemas into usable Kotlin classes.
2. Multiplatform APIs for the AT Protocol spec that can be used with any compatible service, including Bluesky Social.
   • Supports Android, JVM, JavaScript, and iOS.
3. APIs to authenticate via OAuth to a Personal Data Server (PDS).
   • Supports Android, JVM, JavaScript, and iOS.
4. APIs to connect to the Jetstream firehose for Bluesky Social.
   • Supports Android, JVM, and JavaScript.
5. Example client apps that demonstrate usage of those APIs.

Why "Ozone"?

O₃ exists at all levels in the ATmosphere.

No relation to the moderation tools also named Ozone.

Bluesky Social Bindings

Documentation is available at ozone.christian.sh.

Warning

🚧 🚧 🚧 Everything in here is very much a work-in-progress! The upstream schemas are still subject to breaking changes and may break at any moment if used in production code. Use at your own risk!

Java / Kotlin

// build.gradle[.kts]

dependencies {
  api("sh.christian.ozone:bluesky:0.3.3")
}

Swift / Objective-C

In Xcode, select File > Add Packages and enter https://github.com/christiandeange/BlueskyAPI

OAuth Client

Documentation is available at ozone.christian.sh in the sh.christian.ozone.oauth package.

Java / Kotlin

// build.gradle[.kts]

dependencies {
  api("sh.christian.ozone:oauth:0.3.3")
}

Jetstream Bindings

Documentation is available at ozone.christian.sh in the sh.christian.ozone.jetstream package.

Java / Kotlin

// build.gradle[.kts]

dependencies {
  api("sh.christian.ozone:jetstream:0.3.3")
}

Gradle Plugin

In addition to shipping the lexicons that define the official Bluesky API, this project also includes a Gradle Plugin that allows you to bring your own lexicon definitions and generate any set of AT Protocol bindings from them.

// build.gradle[.kts]

plugins {
  id("sh.christian.ozone.generator") version "0.3.3"
}

dependencies {
  // This is where you have your schema files stored in your project.
  lexicons(fileTree("lexicons") { include("**/*.json") })

  // You can also depend directly on the published Bluesky lexicons instead.
  lexicons("sh.christian.ozone:lexicons:2026.03.28")
}

lexicons {
  // Determines the package name of generated supporting methods. Defaults to "sh.christian.ozone".
  namespace.set("com.example.myapp")

   // Configuration for how to handle unknown types and known values.
  defaults {
     // Determines whether to generate classes to encapsulate unknown types for union references. Defaults to false.
     generateUnknownsForSealedTypes.set(true)

     // Determines whether to generate classes to encapsulate unknown values for strings. Defaults to false.
     generateUnknownsForEnums.set(true)
      
     // Defines what type to use when the protocol has binary data inputs or outputs. Defaults to ByteArray.
     binaryDataType.set(BinaryDataType.ByteArray)
  }

  // Generates an additional interface for the target schemas.
  // This method can be called more than once to generate multiple API interfaces.
  generateApi("BlueskyApi") {
    // Determines the package name of the generated API. Defaults to "sh.christian.ozone".
    packageName.set("com.example.myapp")

    // Generates an additional class that implements this interface by sending corresponding
    // XRPC requests to a provided host conforming to the AT Protocol.
    // Inherits the same package name as the generated interface.
    // NOTE: Responses are still read entirely into memory regardless of the binaryDataType 
    // specified in the default configuration. Streaming response types are unsupported
    // at this time.
    withKtorImplementation("XrpcBlueskyApi")

    // Determines the return type for each generated API method. Defaults to Raw.
    // - Raw: the raw data type
    // - Result: Result<T>
    // - Response: AtpResponse<T>
    returnType.set(ApiReturnType.Result)

    // Determines whether the generated methods should be marked as suspend functions.
    // When generating a Ktor implementation as well, execution will block the current thread
    // for non-suspending methods. Defaults to true.
    suspending.set(true)
  }

  // File path where Kotlin source files will be written to. Defaults to "<project-dir>/build/generated/lexicons".
  outputDirectory.set(project.layout.buildDirectory.dir("out"))
}