feat: Native failover in Messages API (#586)

Author: SMadani

CHANGELOG.md

@@ -2,6 +2,9 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+# [9.3.0] - 2025-05-07
+- Added support for native failover in Messages API
+
 # [9.2.0] - 2025-04-30
 - Added support for setting additional request headers in `HttpConfig`
 - Allow setting `HttpClient` and `HttpConfig` on `HttpWrapper`

README.md

@@ -74,7 +74,7 @@ Add the following to your `build.gradle` or `build.gradle.kts` file:
 
 ```groovy
 dependencies {
-    implementation("com.vonage:server-sdk:9.2.0")
+    implementation("com.vonage:server-sdk:9.3.0")
 }
 ```
 
@@ -85,7 +85,7 @@ Add the following to the `<dependencies>` section of your `pom.xml` file:
 <dependency>
     <groupId>com.vonage</groupId>
     <artifactId>server-sdk</artifactId>
-    <version>9.2.0</version>
+    <version>9.3.0</version>
 </dependency>
 ```
 

pom.xml

@@ -5,7 +5,7 @@
 
   <groupId>com.vonage</groupId>
   <artifactId>server-sdk</artifactId>
-  <version>9.2.0</version>
+  <version>9.3.0</version>
 
   <name>Vonage Java Server SDK</name>
   <description>Java client for Vonage APIs</description>

src/main/java/com/vonage/client/HttpWrapper.java

@@ -37,7 +37,7 @@
 public class HttpWrapper {
     private static final String
             CLIENT_NAME = "vonage-java-sdk",
-            CLIENT_VERSION = "9.2.0",
+            CLIENT_VERSION = "9.3.0",
             JAVA_VERSION = System.getProperty("java.version"),
             USER_AGENT = String.format("%s/%s java/%s", CLIENT_NAME, CLIENT_VERSION, JAVA_VERSION);
 

src/main/java/com/vonage/client/messages/MessageRequest.java

@@ -22,9 +22,7 @@
 import com.vonage.client.common.MessageType;
 import com.vonage.client.messages.internal.MessagePayload;
 import java.net.URI;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.Objects;
+import java.util.*;
 
 /**
  * Abstract base class of all Messages sent via the Messages v1 API. All subclasses follow a
@@ -43,6 +41,7 @@ public abstract class MessageRequest extends JsonableBaseObject {
 	final String clientRef;
 	final URI webhookUrl;
 	final MessagesVersion webhookVersion;
+	final List<MessageRequest> failover;
 	protected final Integer ttl;
 	final String text;
 	protected final Map<String, Object> custom;
@@ -71,6 +70,7 @@ protected MessageRequest(Builder<?, ?> builder, Channel channel, MessageType mes
 		clientRef = validateClientReference(builder.clientRef);
 		webhookUrl = builder.webhookUrl;
 		webhookVersion = builder.webhookVersion;
+		failover = builder.failover;
 
 		MessagePayload media = null;
 		Map<String, Object> custom = null;
@@ -180,6 +180,11 @@ public MessagesVersion getWebhookVersion() {
 		return webhookVersion;
 	}
 
+	@JsonProperty("failover")
+	public List<MessageRequest> getFailover() {
+		return failover;
+	}
+
 	@JsonProperty("ttl")
 	protected Integer getTtl() {
 		return ttl;
@@ -210,6 +215,7 @@ public abstract static class Builder<M extends MessageRequest, B extends Builder
 		private String from, to, clientRef, text, url, caption, name;
 		private URI webhookUrl;
 		private MessagesVersion webhookVersion;
+		private List<MessageRequest> failover;
 		private Integer ttl;
 		private Map<String, Object> custom;
 
@@ -381,6 +387,33 @@ protected B name(String name) {
 			return (B) this;
 		}
 
+		/**
+		 * (OPTIONAL)
+		 * Sets the failover messages to be sent if the primary message fails.
+		 *
+		 * @param failover The failover message(s).
+		 * @return This builder.
+		 *
+		 * @since 9.3.0
+		 */
+		public B failover(MessageRequest... failover) {
+			return failover(Arrays.asList(failover));
+		}
+
+		/**
+		 * (OPTIONAL)
+		 * Sets the failover messages to be sent if the primary message fails.
+		 *
+		 * @param failover The list of failover messages.
+		 * @return This builder.
+		 *
+		 * @since 9.3.0
+		 */
+		public B failover(List<MessageRequest> failover) {
+			this.failover = failover;
+			return (B) this;
+		}
+
 		/**
 		 * Builds the MessageRequest.
 		 *

src/main/java/com/vonage/client/messages/MessageResponse.java

@@ -24,7 +24,8 @@
  * the returned response (HTTP 202 payload) is always the same format.
  */
 public class MessageResponse extends JsonableBaseObject {
-	protected UUID messageUuid;
+	private UUID messageUuid;
+	private String workflowId;
 
 	/**
 	 * Protected to prevent users from explicitly creating this object.
@@ -41,4 +42,16 @@ protected MessageResponse() {
 	public UUID getMessageUuid() {
 		return messageUuid;
 	}
+
+	/**
+	 * Returns the workflow ID of the message that was sent to track the failover (if applicable).
+	 *
+	 * @return The failover workflow ID, or {@code null} if absent / not applicable.
+	 *
+	 * @since 9.3.0
+	 */
+	@JsonProperty("workflow_id")
+	public String getWorkflowId() {
+		return workflowId;
+	}
 }

src/main/java/com/vonage/client/messages/MessageStatus.java

@@ -58,6 +58,44 @@ public String toString() {
 		}
 	}
 
+	/**
+	 * Represents the {@code workflow} object in the status webhook for native failover.
+	 *
+	 * @since 9.3.0
+	 */
+	public static final class Workflow extends  JsonableBaseObject {
+		@JsonProperty("id") String id;
+		@JsonProperty("item_number") Integer itemNumber;
+		@JsonProperty("items_total") @JsonAlias("total_items") Integer totalItems;
+
+		/**
+		 * ID of the workflow.
+		 *
+		 * @return The workflow type as a string.
+		 */
+		public String getId() {
+			return id;
+		}
+
+		/**
+		 * The message number (sequence) in the workflow.
+		 *
+		 * @return The index of this message in the workflow as integer.
+		 */
+		public Integer getItemNumber() {
+			return itemNumber;
+		}
+
+		/**
+		 * Total number of messages in this workflow.
+		 *
+		 * @return The number of messages (including failover) in the workflow as integer.
+		 */
+		public Integer getTotalItems() {
+			return totalItems;
+		}
+	}
+
 	/**
 	 * Describes the error that was encountered when sending the message.
 	 */
@@ -174,6 +212,7 @@ protected MessageStatus() {
 	@JsonProperty("channel") protected Channel channel;
 	@JsonProperty("client_ref") protected String clientRef;
 	@JsonProperty("error") protected Error error;
+	@JsonProperty("workflow") protected Workflow workflow;
 	@JsonProperty("usage") protected Usage usage;
 
 	@JsonProperty("destination") private Destination destination;
@@ -254,6 +293,17 @@ public Error getError() {
 		return error;
 	}
 
+	/**
+	 * If the message was sent with a failover workflow, the details of this will be returned here.
+	 *
+	 * @return The workflow object, or {@code null} if absent / not applicable.
+	 *
+	 * @since 9.3.0
+	 */
+	public Workflow getWorkflow() {
+		return workflow;
+	}
+
 	/**
 	 * Describes the cost of the message that was sent.
 	 *

src/test/java/com/vonage/client/TestUtils.java

@@ -159,13 +159,11 @@ public static HttpWrapper httpWrapperWithAllAuthMethods() {
     }
 
 
-    // TODO make package-private after removing Meetings
-    public static CloseableHttpClient stubHttpClient(int statusCode) throws Exception {
+    static CloseableHttpClient stubHttpClient(int statusCode) throws Exception {
         return stubHttpClient(statusCode, "");
     }
 
-    // TODO make package-private after removing Meetings
-    public static CloseableHttpClient stubHttpClient(int statusCode, String content, String... additionalReturns) throws Exception {
+    static CloseableHttpClient stubHttpClient(int statusCode, String content, String... additionalReturns) throws Exception {
         CloseableHttpClient result = mock(CloseableHttpClient.class);
 
         CloseableHttpResponse response = mock(CloseableHttpResponse.class);

src/test/java/com/vonage/client/messages/MessageRequestTest.java

@@ -48,13 +48,21 @@ private ConcreteMessageRequest(Builder builder) {
 	}
 
 	@Test
-	public void testSerializeAllFields() {
+	public void testSerializeAllFieldsWithFailover() {
 		MessageRequest smr = ConcreteMessageRequest.builder(MessageType.VIDEO, Channel.MMS)
 				.from("447900000009").to("12002009000")
 				.url("https://example.com/video.mp4")
 				.clientRef("<40 character string")
 				.webhookUrl("https://example.com/status")
-				.webhookVersion(MessagesVersion.V1).build();
+				.webhookVersion(MessagesVersion.V1)
+				.failover(ConcreteMessageRequest.builder(MessageType.IMAGE, Channel.RCS)
+							.from("12002009001").to("44790000002")
+							.url("https://example.org/image.jpg").build(),
+						ConcreteMessageRequest.builder(MessageType.TEXT, Channel.SMS)
+								.from("SenderID").to("44790000004")
+								.text("Fallback text message").build()
+				)
+				.build();
 
 		String generatedJson = smr.toJson();
 		assertTrue(generatedJson.contains("\"client_ref\":\"<40 character string\""));
@@ -64,6 +72,11 @@ public void testSerializeAllFields() {
 		assertTrue(generatedJson.contains("\"to\":\"12002009000\""));
 		assertTrue(generatedJson.contains("\"channel\":\"mms\""));
 		assertTrue(generatedJson.contains("\"message_type\":\"video\""));
+		assertTrue(generatedJson.contains("\"failover\":[" +
+				"{\"message_type\":\"image\",\"channel\":\"rcs\",\"from\":\"12002009001\",\"to\":\"44790000002\"}," +
+				"{\"message_type\":\"text\",\"channel\":\"sms\",\"from\":\"SenderID\",\"to\":\"44790000004\"," +
+				"\"text\":\"Fallback text message\"}]"
+		));
 		assertFalse(generatedJson.contains("https://example.com/video.mp4"));
 	}
 
@@ -200,9 +213,7 @@ public void testConstructNoChannel() {
 	@Test
 	public void testConstructLongClientRef() {
 		StringBuilder clientRef = new StringBuilder(41);
-		for (int i = 0; i < 99; i++) {
-			clientRef.append('c');
-		}
+        clientRef.append("c".repeat(99));
 
 		ConcreteMessageRequest.Builder builder = ConcreteMessageRequest
 				.builder(MessageType.FILE, Channel.RCS)

src/test/java/com/vonage/client/messages/MessageResponseTest.java

@@ -27,8 +27,10 @@ public class MessageResponseTest {
 	@Test
 	public void testConstructFromValidJson() {
 		UUID uuid = UUID.randomUUID();
-		MessageResponse response = Jsonable.fromJson("{\"message_uuid\":\""+uuid+"\"}");
+		String workflowId = "3TcNjguphQTKshBPRJUVYx6sREpqvhgghJza6sWMk9ztEQQdiW9vwGG";
+		MessageResponse response = Jsonable.fromJson("{\"message_uuid\":\""+uuid+"\",\"workflow_id\":\""+workflowId+"\"}");
 		assertEquals(uuid, response.getMessageUuid());
+		assertEquals(workflowId, response.getWorkflowId());
 		String toString = response.toString();
 		assertTrue(toString.contains("MessageResponse"));
 		assertTrue(toString.contains(uuid.toString()));
@@ -39,6 +41,7 @@ public void testConstructFromValidJson() {
 	public void testConstructFromEmptyJson() {
 		MessageResponse response = Jsonable.fromJson("{}");
 		assertNull(response.getMessageUuid());
+		assertNull(response.getWorkflowId());
 		TestUtils.testJsonableBaseObject(response);
 	}