Implement send message for the chat

Author: rubengees

library/src/main/java/me/proxer/library/api/chat/ChatApi.java

@@ -31,4 +31,11 @@ public PublicChatRoomsEndpoint publicRooms() {
     public ChatMessagesEndpoint messages(final String roomId) {
         return new ChatMessagesEndpoint(internalApi, roomId);
     }
+
+    /**
+     * Returns the respective endpoint.
+     */
+    public SendChatMessageEndpoint sendMessage(final String roomId, final String message) {
+        return new SendChatMessageEndpoint(internalApi, roomId, message);
+    }
 }

library/src/main/java/me/proxer/library/api/chat/InternalApi.java

@@ -3,7 +3,10 @@
 import me.proxer.library.api.ProxerCall;
 import me.proxer.library.entity.chat.ChatMessage;
 import me.proxer.library.entity.chat.ChatRoom;
+import retrofit2.http.Field;
+import retrofit2.http.FormUrlEncoded;
 import retrofit2.http.GET;
+import retrofit2.http.POST;
 import retrofit2.http.Query;
 
 import javax.annotation.ParametersAreNullableByDefault;
@@ -21,4 +24,9 @@ public interface InternalApi {
     @GET("chat/messages")
     ProxerCall<List<ChatMessage>> messages(@Query("room_id") String roomId,
                                            @Query("message_id") String messageId);
+
+    @FormUrlEncoded
+    @POST("chat/newmessage")
+    ProxerCall<String> sendMessage(@Field("room_id") String roomId,
+                                   @Field("message") String message);
 }

library/src/main/java/me/proxer/library/api/chat/SendChatMessageEndpoint.java

@@ -0,0 +1,35 @@
+package me.proxer.library.api.chat;
+
+import lombok.experimental.Accessors;
+import me.proxer.library.api.Endpoint;
+import me.proxer.library.api.ProxerCall;
+
+/**
+ * Endpoint for sending a single message in a {@link me.proxer.library.entity.chat.ChatRoom}.
+ * <p>
+ * Upon success, the id of the message is returned.
+ *
+ * @author Ruben Gees
+ */
+@Accessors(fluent = true)
+public final class SendChatMessageEndpoint implements Endpoint<String> {
+
+    private final InternalApi internalApi;
+
+    private final String roomId;
+    private final String message;
+
+    SendChatMessageEndpoint(final InternalApi internalApi, final String roomId, final String message) {
+        this.internalApi = internalApi;
+        this.roomId = roomId;
+        this.message = message;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public ProxerCall<String> build() {
+        return internalApi.sendMessage(roomId, message);
+    }
+}

library/src/test/java/me/proxer/library/api/chat/SendChatMessageEndpointTest.java

@@ -0,0 +1,52 @@
+package me.proxer.library.api.chat;
+
+import me.proxer.library.ProxerTest;
+import me.proxer.library.api.ProxerException;
+import okhttp3.mockwebserver.MockResponse;
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Ruben Gees
+ */
+public class SendChatMessageEndpointTest extends ProxerTest {
+
+    @Test
+    public void testDefault() throws ProxerException, IOException {
+        server.enqueue(new MockResponse().setBody(fromResource("empty.json")));
+
+        final String result = api.chat()
+                .sendMessage("123", "message")
+                .build()
+                .execute();
+
+        assertThat(result).isNull();
+    }
+
+    @Test
+    public void testPath() throws ProxerException, IOException, InterruptedException {
+        server.enqueue(new MockResponse().setBody(fromResource("empty.json")));
+
+        api.chat().sendMessage("123", "message")
+                .build()
+                .execute();
+
+        assertThat(server.takeRequest().getPath())
+                .isEqualTo("/api/v1/chat/newmessage");
+    }
+
+    @Test
+    public void testParameters() throws ProxerException, IOException, InterruptedException {
+        server.enqueue(new MockResponse().setBody(fromResource("empty.json")));
+
+        api.chat().sendMessage("312", "someMessage")
+                .build()
+                .execute();
+
+        assertThat(server.takeRequest().getBody().readUtf8())
+                .isEqualTo("room_id=312&message=someMessage");
+    }
+}