Add AAI UserAgent

.fernignore

@@ -18,10 +18,16 @@ src/main/java/com/assemblyai/api/resources/realtime/types/SessionTerminated.java
 # Ignore ClientOptions to support custom timeouts for LeMUR.
 src/main/java/com/assemblyai/api/AssemblyAIBuilder.java
 src/main/java/com/assemblyai/api/core/ClientOptions.java
+src/main/java/com/assemblyai/api/core/UserAgent.java
+src/main/java/com/assemblyai/api/core/UserAgentInterceptor.java
+src/main/java/com/assemblyai/api/core/UserAgentItem.java
 
 sample-app/src/main/java/sample/App.java
 sample-app/src/main/resources/
 
+# Ignore tests
+src/test
+
 LICENSE
 README.md
 

src/main/java/com/assemblyai/api/AssemblyAIBuilder.java

@@ -5,17 +5,19 @@
 
 import com.assemblyai.api.core.ClientOptions;
 import com.assemblyai.api.core.Environment;
+import com.assemblyai.api.core.UserAgent;
 
 public final class AssemblyAIBuilder {
     private ClientOptions.Builder clientOptionsBuilder = ClientOptions.builder();
     private ClientOptions.Builder lemurClientOptionsBuilder = ClientOptions.builder();
 
     private String apiKey = null;
+    private UserAgent userAgent = UserAgent.getDefault();
 
     private Environment environment = Environment.DEFAULT;
 
     /**
-     * Sets apiKey
+     * Sets API key
      */
     public AssemblyAIBuilder apiKey(String apiKey) {
         this.apiKey = apiKey;
@@ -27,6 +29,18 @@ public AssemblyAIBuilder environment(Environment environment) {
         return this;
     }
 
+    /**
+     * Merges AssemblyAI user agent with the default AssemblyAI user agent.
+     * If null, sets the AssemblyAI user agent to null.
+     *
+     * @param userAgent The AssemblyAI user agent
+     * @return AssemblyAIBuilder
+     */
+    public AssemblyAIBuilder userAgent(UserAgent userAgent) {
+        this.userAgent = userAgent;
+        return this;
+    }
+
     public AssemblyAIBuilder url(String url) {
         this.environment = Environment.custom(url);
         return this;
@@ -36,10 +50,18 @@ public AssemblyAI build() {
         if (apiKey == null) {
             throw new RuntimeException("Please provide apiKey");
         }
+
         this.clientOptionsBuilder.addHeader("Authorization", this.apiKey);
-        clientOptionsBuilder.environment(this.environment);
+        clientOptionsBuilder
+                .environment(this.environment)
+                .userAgent(userAgent);
+
         this.lemurClientOptionsBuilder.addHeader("Authorization", this.apiKey);
-        lemurClientOptionsBuilder.environment(this.environment).disableTimeouts();
+        lemurClientOptionsBuilder
+                .environment(this.environment)
+                .userAgent(userAgent)
+                .disableTimeouts();
+
         return new AssemblyAI(clientOptionsBuilder.build(), lemurClientOptionsBuilder.build());
     }
 }

src/main/java/com/assemblyai/api/core/ClientOptions.java

@@ -10,6 +10,8 @@
 
 import okhttp3.OkHttpClient;
 
+import static com.assemblyai.api.core.Constants.SDK_VERSION;
+
 public final class ClientOptions {
     private final Environment environment;
 
@@ -30,7 +32,7 @@ private ClientOptions(
         this.headers.putAll(new HashMap<String, String>() {
             {
                 put("X-Fern-SDK-Name", "com.assemblyai.fern:api-sdk");
-                put("X-Fern-SDK-Version", "1.1.3");
+                put("X-Fern-SDK-Version", SDK_VERSION);
                 put("X-Fern-Language", "JAVA");
             }
         });
@@ -77,6 +79,7 @@ public static Builder builder() {
 
     public static final class Builder {
         private Environment environment;
+        private UserAgent userAgent = UserAgent.getDefault();
 
         private final Map<String, String> headers = new HashMap<>();
 
@@ -100,7 +103,30 @@ public Builder addHeader(String key, Supplier<String> value) {
         }
 
         /**
-         * This is a temporary measure ot disable timeouts for LeMUR client.
+         * Merges AssemblyAI user agent with the default AssemblyAI user agent.
+         * If null, sets the AssemblyAI user agent to null.
+         *
+         * @param userAgent The AssemblyAI user agent
+         * @return ClientOptionsBuilder
+         */
+        public Builder userAgent(UserAgent userAgent) {
+            if (userAgent == null) {
+                this.userAgent = null;
+                return this;
+            }
+
+            // if current and incoming user agent is default user agent, no-op
+            if(userAgent == UserAgent.getDefault() && this.userAgent == UserAgent.getDefault()) {
+                return this;
+            }
+
+            // create a new user agent that merges existing and incoming user agent
+            this.userAgent = new UserAgent(this.userAgent, userAgent);
+            return this;
+        }
+
+        /**
+         * This is a temporary measure to disable timeouts for LeMUR client.
          * Don't use this method.
          *
          * @return ClientOptionsBuilder
@@ -113,15 +139,21 @@ public Builder disableTimeouts() {
 
         public ClientOptions build() {
             OkHttpClient.Builder okhttpClientBuilder = new OkHttpClient.Builder()
-                    .addInterceptor(new RetryInterceptor(3));
+                    .addInterceptor(new RetryInterceptor(3))
+                    .addInterceptor(new UserAgentInterceptor(this.userAgent));
             if (this.disableTimeouts) {
                 okhttpClientBuilder
                         .callTimeout(0, TimeUnit.SECONDS)
                         .connectTimeout(0, TimeUnit.SECONDS)
                         .writeTimeout(0, TimeUnit.SECONDS)
                         .readTimeout(0, TimeUnit.SECONDS);
             }
-            return new ClientOptions(environment, headers, headerSuppliers, okhttpClientBuilder.build());
+            return new ClientOptions(
+                    environment,
+                    headers,
+                    headerSuppliers,
+                    okhttpClientBuilder.build()
+            );
         }
     }
 }

src/main/java/com/assemblyai/api/core/Constants.java

@@ -0,0 +1,5 @@
+package com.assemblyai.api.core;
+
+public class Constants {
+    public static final String SDK_VERSION = "1.1.3";
+}

src/main/java/com/assemblyai/api/core/Environment.java

@@ -16,6 +16,7 @@ public String getUrl() {
         return this.url;
     }
 
+
     public static Environment custom(String url) {
         return new Environment(url);
     }

src/main/java/com/assemblyai/api/core/UserAgent.java

@@ -0,0 +1,94 @@
+package com.assemblyai.api.core;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import static com.assemblyai.api.core.Constants.SDK_VERSION;
+
+public class UserAgent {
+    private static final UserAgent defaultUserAgent;
+
+    static {
+        defaultUserAgent = createDefaultUserAgent();
+    }
+
+    private final Map<String, UserAgentItem> userAgent;
+
+    public UserAgent(Map<String, UserAgentItem> userAgent) {
+        this.userAgent = userAgent;
+    }
+
+    public UserAgent(UserAgent a, UserAgent b) {
+        this.userAgent = UserAgent.merge(a.userAgent, b.userAgent);
+    }
+
+    public String toAssemblyAIUserAgentString() {
+        StringBuilder sb = new StringBuilder();
+        if (this.userAgent == null) {
+            return sb.toString();
+        }
+
+        sb.append(" AssemblyAI/1.0 (");
+        sb.append(
+                this.userAgent
+                        .entrySet()
+                        .stream()
+                        .map(entry -> String.format(
+                                "%s=%s/%s",
+                                entry.getKey(),
+                                entry.getValue().getName(),
+                                entry.getValue().getVersion()
+                        ))
+                        .collect(Collectors.joining(" "))
+        );
+        sb.append(")");
+        return sb.toString();
+    }
+
+    public static UserAgent getDefault(){
+        return defaultUserAgent;
+    }
+
+    private static UserAgent createDefaultUserAgent() {
+        HashMap<String, UserAgentItem> defaultUserAgent = new HashMap<>();
+        defaultUserAgent.put(
+                "sdk",
+                new UserAgentItem(
+                        "Java",
+                        SDK_VERSION
+                )
+        );
+        defaultUserAgent.put(
+                "runtime_env",
+                new UserAgentItem(
+                        System.getProperty("java.runtime.name"),
+                        System.getProperty("java.runtime.version")
+                )
+        );
+
+        return new UserAgent(defaultUserAgent);
+    }
+
+    private UserAgent merge(UserAgent other) {
+        return new UserAgent(UserAgent.merge(this.userAgent, other.userAgent));
+    }
+
+    private static Map<String, UserAgentItem> merge(Map<String, UserAgentItem> a, Map<String, UserAgentItem> b) {
+        Map<String, UserAgentItem> newUserAgent = new HashMap<>();
+
+        // user this user agent
+        newUserAgent.putAll(a);
+        // override with incoming user agent
+        newUserAgent.putAll(b);
+
+        // remove all null values
+        for (Map.Entry<String, UserAgentItem> entry : b.entrySet()) {
+            if (entry.getValue() == null) {
+                newUserAgent.remove(entry.getKey());
+            }
+        }
+        return newUserAgent;
+    }
+}
+

src/main/java/com/assemblyai/api/core/UserAgentInterceptor.java

@@ -0,0 +1,47 @@
+package com.assemblyai.api.core;
+
+import okhttp3.Interceptor;
+import okhttp3.Request;
+import okhttp3.Response;
+import org.jetbrains.annotations.NotNull;
+
+import java.io.IOException;
+
+public class UserAgentInterceptor implements Interceptor {
+    private final UserAgent userAgent;
+
+    public UserAgentInterceptor(UserAgent userAgent) {
+        this.userAgent = userAgent;
+    }
+
+    @NotNull
+    @Override
+    public Response intercept(@NotNull Chain chain) throws IOException {
+        if (userAgent == null) {
+            return chain.proceed(chain.request());
+        }
+
+        Request originalRequest = chain.request();
+        String userAgentString = originalRequest.headers().get("User-Agent");
+        if (userAgentString != null) {
+            // if already contains AssemblyAI UA, skip
+            if (userAgentString.contains("AssemblyAI/")) {
+                return chain.proceed(chain.request());
+            }
+        } else {
+            userAgentString = "";
+        }
+
+        String assemblyAIUserAgentString = userAgent.toAssemblyAIUserAgentString();
+        // if AAI UA null or empty, skip
+        if (assemblyAIUserAgentString == null || assemblyAIUserAgentString.isEmpty()) {
+            return chain.proceed(chain.request());
+        }
+
+        userAgentString += " " + assemblyAIUserAgentString;
+        Request requestWithUserAgent = originalRequest.newBuilder()
+                .header("User-Agent", userAgentString)
+                .build();
+        return chain.proceed(requestWithUserAgent);
+    }
+}

src/main/java/com/assemblyai/api/core/UserAgentItem.java

@@ -0,0 +1,19 @@
+package com.assemblyai.api.core;
+
+public class UserAgentItem{
+    private final String name;
+    private final String version;
+
+    public UserAgentItem(String name, String version) {
+        this.name = name;
+        this.version = version;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getVersion() {
+        return version;
+    }
+}

src/test/java/com/assemblyai/api/UserAgentTest.java

@@ -0,0 +1,20 @@
+package com.assemblyai.api;
+
+import com.assemblyai.api.core.UserAgent;
+import org.junit.jupiter.api.Test;
+
+import static com.assemblyai.api.core.Constants.SDK_VERSION;
+
+public final class UserAgentTest {
+    @Test
+    public void ShouldCreateDefaultUserAgent() {
+        UserAgent agent = UserAgent.getDefault();
+        assert agent != null;
+        String userAgentString = agent.toAssemblyAIUserAgentString();
+        assert userAgentString != null;
+        assert userAgentString.contains("AssemblyAI/1.0 (");
+        assert userAgentString.endsWith(")");
+        assert userAgentString.contains("sdk=Java/" + SDK_VERSION);
+        assert userAgentString.contains("runtime_env=OpenJDK Runtime Environment/");
+    }
+}