Add OpenAiService and OpenAiApiExample

Added the ability to get all available engines, and added a example class to test it.

README.md

@@ -0,0 +1,4 @@
+```
+export OPENAI_TOKEN="sk-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
+./gradlew example:run
+```

build.gradle

@@ -1,29 +1,5 @@
-/*
- * This file was generated by the Gradle 'init' task.
- *
- * This generated file contains a sample Java Library project to get you started.
- * For more details take a look at the Java Libraries chapter in the Gradle
- * User Manual available at https://docs.gradle.org/6.5/userguide/java_library_plugin.html
- */
-
-plugins {
-    // Apply the java-library plugin to add support for Java Library
-    id 'java-library'
-}
-
-repositories {
-    // Use jcenter for resolving dependencies.
-    // You can declare any Maven/Ivy/file repository here.
-    jcenter()
-}
-
-dependencies {
-    // This dependency is exported to consumers, that is to say found on their compile classpath.
-    api 'org.apache.commons:commons-math3:3.6.1'
-
-    // This dependency is used internally, and not exposed to consumers on their own compile classpath.
-    implementation 'com.google.guava:guava:29.0-jre'
-
-    // Use JUnit test framework
-    testImplementation 'junit:junit:4.13'
-}
+allprojects {
+    repositories {
+        jcenter()
+    }
+}

example/build.gradle

@@ -0,0 +1,10 @@
+apply plugin: 'java'
+apply plugin: 'application'
+
+application {
+    mainClassName = 'example.OpenAiApiExample'
+}
+
+dependencies {
+    implementation project(":openai")
+}

example/src/main/java/example/OpenAiApiExample.java

@@ -0,0 +1,14 @@
+package example;
+
+import openai.OpenAiService;
+import openai.engine.Engine;
+
+class OpenAiApiExample {
+    public static void main(String... args) {
+        String token = System.getenv("OPENAI_TOKEN");
+        OpenAiService service = new OpenAiService(token);
+
+        System.out.println("Getting available engines");
+        service.getEngines().forEach((Engine e) -> System.out.println(e.id));
+    }
+}

openai/build.gradle

@@ -0,0 +1,9 @@
+apply plugin: 'java-library'
+
+dependencies {
+    api 'com.squareup.retrofit2:retrofit:2.5.0'
+    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.5.0'
+    implementation 'com.squareup.retrofit2:converter-jackson:2.5.0'
+
+    testImplementation 'junit:junit:4.13'
+}

openai/src/main/java/openai/AuthenticationInterceptor.java

@@ -0,0 +1,28 @@
+package openai;
+
+import okhttp3.Interceptor;
+import okhttp3.Request;
+import okhttp3.Response;
+
+import java.io.IOException;
+
+/**
+ * OkHttp Interceptor that adds an authorization token header
+ */
+public class AuthenticationInterceptor implements Interceptor {
+
+    private final String token;
+
+    AuthenticationInterceptor(String token) {
+        this.token = token;
+    }
+
+    @Override
+    public Response intercept(Chain chain) throws IOException {
+        Request request = chain.request()
+                .newBuilder()
+                .header("Authorization", "Bearer " + token)
+                .build();
+        return chain.proceed(request);
+    }
+}

openai/src/main/java/openai/OpenAiApi.java

@@ -0,0 +1,11 @@
+package openai;
+
+import io.reactivex.Single;
+import openai.engine.Engine;
+import retrofit2.http.GET;
+
+public interface OpenAiApi {
+
+    @GET("v1/engines")
+    Single<OpenAiResponse<Engine>> getEngines();
+}

openai/src/main/java/openai/OpenAiResponse.java

@@ -0,0 +1,8 @@
+package openai;
+
+import java.util.List;
+
+public class OpenAiResponse<T> {
+    public List<T> data;
+    public String object;
+}

openai/src/main/java/openai/OpenAiService.java

@@ -0,0 +1,45 @@
+package openai;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.PropertyNamingStrategy;
+import okhttp3.ConnectionPool;
+import okhttp3.OkHttpClient;
+import openai.engine.Engine;
+import retrofit2.Retrofit;
+import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
+import retrofit2.converter.jackson.JacksonConverterFactory;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+public class OpenAiService {
+
+    OpenAiApi api;
+
+    public OpenAiService(String token) {
+        ObjectMapper mapper = new ObjectMapper();
+        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
+        mapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
+
+        OkHttpClient client = new OkHttpClient.Builder()
+                .addInterceptor(new AuthenticationInterceptor(token))
+                .connectionPool(new ConnectionPool(5, 1, TimeUnit.SECONDS))
+                .build();
+
+        Retrofit retrofit = new Retrofit.Builder()
+                .baseUrl("https://api.openai.com/")
+                .client(client)
+                .addConverterFactory(JacksonConverterFactory.create(mapper))
+                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
+                .build();
+
+        api = retrofit.create(OpenAiApi.class);
+    }
+
+    public List<Engine> getEngines() {
+        return api.getEngines().blockingGet().data;
+    }
+}

openai/src/main/java/openai/engine/Engine.java

@@ -0,0 +1,8 @@
+package openai.engine;
+
+public class Engine {
+    public String id;
+    public String object;
+    public String owner;
+    public boolean ready;
+}

settings.gradle

@@ -1,10 +1,5 @@
-/*
- * This file was generated by the Gradle 'init' task.
- *
- * The settings file is used to specify which projects to include in your build.
- *
- * Detailed information about configuring a multi-project build in Gradle can be found
- * in the user manual at https://docs.gradle.org/6.5/userguide/multi_project_builds.html
- */
-
 rootProject.name = 'openai-java'
+
+include ':openai'
+include ':example'
+

src/main/java/openai/OpenAiApi.java

@@ -1,2 +0,0 @@
-public interface OpenAiApi {
-}