Add content-type in the AsyncRequestBody and corresponding tests.

.changes/next-release/bugfix-AWSSDKforJavav2-2d297fd.json

@@ -0,0 +1,6 @@
+{
+    "category": "AWS SDK for Java v2", 
+    "contributor": "", 
+    "type": "bugfix", 
+    "description": "Add support for content-type in AsyncRequestBody."
+}

core/auth/src/main/java/software/amazon/awssdk/auth/signer/internal/BaseEventStreamAsyncAws4Signer.java

@@ -268,6 +268,11 @@ public void subscribe(Subscriber<? super ByteBuffer> s) {
         public Optional<Long> contentLength() {
             return transformedRequestBody.contentLength();
         }
+
+        @Override
+        public String contentType() {
+            return transformedRequestBody.contentType();
+        }
     }
 
     static String toDebugString(Message m, boolean truncatePayload) {

core/sdk-core/src/main/java/software/amazon/awssdk/core/async/AsyncRequestBody.java

@@ -26,6 +26,7 @@
 import software.amazon.awssdk.annotations.SdkPublicApi;
 import software.amazon.awssdk.core.internal.async.ByteArrayAsyncRequestBody;
 import software.amazon.awssdk.core.internal.async.FileAsyncRequestBody;
+import software.amazon.awssdk.core.internal.util.Mimetype;
 import software.amazon.awssdk.utils.BinaryUtils;
 
 /**
@@ -57,6 +58,13 @@ public interface AsyncRequestBody extends SdkPublisher<ByteBuffer> {
      */
     Optional<Long> contentLength();
 
+    /**
+     * @return The content type of the data being produced.
+     */
+    default String contentType() {
+        return Mimetype.MIMETYPE_OCTET_STREAM;
+    }
+
     /**
      * Creates an {@link AsyncRequestBody} the produces data from the input ByteBuffer publisher.
      * The data is delivered when the publisher publishes the data.
@@ -115,7 +123,7 @@ static AsyncRequestBody fromFile(File file) {
      * @see ByteArrayAsyncRequestBody
      */
     static AsyncRequestBody fromString(String string, Charset cs) {
-        return new ByteArrayAsyncRequestBody(string.getBytes(cs));
+        return new ByteArrayAsyncRequestBody(string.getBytes(cs), Mimetype.MIMETYPE_TEXT_PLAIN);
     }
 
     /**
@@ -137,7 +145,7 @@ static AsyncRequestBody fromString(String string) {
      * @return AsyncRequestBody instance.
      */
     static AsyncRequestBody fromBytes(byte[] bytes) {
-        return new ByteArrayAsyncRequestBody(bytes);
+        return new ByteArrayAsyncRequestBody(bytes, Mimetype.MIMETYPE_OCTET_STREAM);
     }
 
     /**
@@ -148,7 +156,7 @@ static AsyncRequestBody fromBytes(byte[] bytes) {
      * @return AsyncRequestBody instance.
      */
     static AsyncRequestBody fromByteBuffer(ByteBuffer byteBuffer) {
-        return new ByteArrayAsyncRequestBody(BinaryUtils.copyAllBytesFrom(byteBuffer));
+        return fromBytes(BinaryUtils.copyAllBytesFrom(byteBuffer));
     }
 
     /**

core/sdk-core/src/main/java/software/amazon/awssdk/core/internal/async/ByteArrayAsyncRequestBody.java

@@ -35,15 +35,23 @@ public final class ByteArrayAsyncRequestBody implements AsyncRequestBody {
 
     private final byte[] bytes;
 
-    public ByteArrayAsyncRequestBody(byte[] bytes) {
+    private final String mimetype;
+
+    public ByteArrayAsyncRequestBody(byte[] bytes, String mimetype) {
         this.bytes = bytes.clone();
+        this.mimetype = mimetype;
     }
 
     @Override
     public Optional<Long> contentLength() {
         return Optional.of((long) bytes.length);
     }
 
+    @Override
+    public String contentType() {
+        return mimetype;
+    }
+
     @Override
     public void subscribe(Subscriber<? super ByteBuffer> s) {
         // As per rule 1.9 we must throw NullPointerException if the subscriber parameter is null

core/sdk-core/src/main/java/software/amazon/awssdk/core/internal/async/FileAsyncRequestBody.java

@@ -29,6 +29,7 @@
 import org.reactivestreams.Subscription;
 import software.amazon.awssdk.annotations.SdkInternalApi;
 import software.amazon.awssdk.core.async.AsyncRequestBody;
+import software.amazon.awssdk.core.internal.util.Mimetype;
 import software.amazon.awssdk.core.internal.util.NoopSubscription;
 import software.amazon.awssdk.utils.builder.SdkBuilder;
 
@@ -70,6 +71,11 @@ public Optional<Long> contentLength() {
         }
     }
 
+    @Override
+    public String contentType() {
+        return Mimetype.getInstance().getMimetype(path);
+    }
+
     @Override
     public void subscribe(Subscriber<? super ByteBuffer> s) {
         try {

core/sdk-core/src/main/java/software/amazon/awssdk/core/runtime/transform/AsyncStreamingRequestMarshaller.java

@@ -15,10 +15,13 @@
 
 package software.amazon.awssdk.core.runtime.transform;
 
+import static software.amazon.awssdk.http.Header.CONTENT_TYPE;
+
 import software.amazon.awssdk.annotations.SdkProtectedApi;
 import software.amazon.awssdk.core.async.AsyncRequestBody;
 import software.amazon.awssdk.core.internal.transform.AbstractStreamingRequestMarshaller;
 import software.amazon.awssdk.http.SdkHttpFullRequest;
+import software.amazon.awssdk.utils.StringUtils;
 
 /**
  * Augments a {@link Marshaller} to add contents for an async streamed request.
@@ -42,6 +45,10 @@ public static Builder builder() {
     @Override
     public SdkHttpFullRequest marshall(T in) {
         SdkHttpFullRequest.Builder marshalled = delegateMarshaller.marshall(in).toBuilder();
+        String contentType = marshalled.firstMatchingHeader(CONTENT_TYPE).orElse(null);
+        if (StringUtils.isEmpty(contentType)) {
+            marshalled.putHeader(CONTENT_TYPE, asyncRequestBody.contentType());
+        }
 
         addHeaders(marshalled, asyncRequestBody.contentLength(), requiresLength, transferEncoding, useHttp2);
 

core/sdk-core/src/test/java/software/amazon/awssdk/core/async/AsyncRequestBodyTest.java

@@ -15,24 +15,39 @@
 
 package software.amazon.awssdk.core.async;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import com.google.common.jimfs.Configuration;
 import com.google.common.jimfs.Jimfs;
 import io.reactivex.Flowable;
+import java.io.File;
+import java.io.FileWriter;
 import java.io.IOException;
+import java.io.InputStream;
 import java.nio.ByteBuffer;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.FileSystem;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.time.Instant;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.Callable;
 import java.util.concurrent.CountDownLatch;
+import java.util.stream.Collectors;
+import org.assertj.core.util.Lists;
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
+import org.reactivestreams.Publisher;
 import org.reactivestreams.Subscriber;
+import software.amazon.awssdk.core.internal.util.Mimetype;
 import software.amazon.awssdk.http.async.SimpleSubscriber;
 import software.amazon.awssdk.utils.BinaryUtils;
+import software.amazon.awssdk.utils.StringInputStream;
 
 @RunWith(Parameterized.class)
 public class AsyncRequestBodyTest {
@@ -96,6 +111,48 @@ public void onComplete() {
         assertThat(sb.toString()).isEqualTo(testString);
     }
 
+    @Test
+    public void stringConstructorHasCorrectContentType() {
+        AsyncRequestBody requestBody = AsyncRequestBody.fromString("hello world");
+        assertThat(requestBody.contentType()).isEqualTo(Mimetype.MIMETYPE_TEXT_PLAIN);
+    }
+
+    @Test
+    public void fileConstructorHasCorrectContentType() {
+        AsyncRequestBody requestBody = AsyncRequestBody.fromFile(path);
+        assertThat(requestBody.contentType()).isEqualTo(Mimetype.MIMETYPE_OCTET_STREAM);
+    }
+
+    @Test
+    public void bytesArrayConstructorHasCorrectContentType() {
+        AsyncRequestBody requestBody = AsyncRequestBody.fromBytes("hello world".getBytes());
+        assertThat(requestBody.contentType()).isEqualTo(Mimetype.MIMETYPE_OCTET_STREAM);
+    }
+
+    @Test
+    public void bytesBufferConstructorHasCorrectContentType() {
+        ByteBuffer byteBuffer = ByteBuffer.wrap("hello world".getBytes());
+        AsyncRequestBody requestBody = AsyncRequestBody.fromByteBuffer(byteBuffer);
+        assertThat(requestBody.contentType()).isEqualTo(Mimetype.MIMETYPE_OCTET_STREAM);
+    }
+
+    @Test
+    public void emptyBytesConstructorHasCorrectContentType() {
+        AsyncRequestBody requestBody = AsyncRequestBody.empty();
+        assertThat(requestBody.contentType()).isEqualTo(Mimetype.MIMETYPE_OCTET_STREAM);
+    }
+
+    @Test
+    public void publisherConstructorHasCorrectContentType() {
+        List<String> requestBodyStrings = Lists.newArrayList("A", "B", "C");
+        List<ByteBuffer> bodyBytes = requestBodyStrings.stream()
+                                                .map(s -> ByteBuffer.wrap(s.getBytes(StandardCharsets.UTF_8)))
+                                                .collect(Collectors.toList());
+        Publisher<ByteBuffer> bodyPublisher = Flowable.fromIterable(bodyBytes);
+        AsyncRequestBody requestBody = AsyncRequestBody.fromPublisher(bodyPublisher);
+        assertThat(requestBody.contentType()).isEqualTo(Mimetype.MIMETYPE_OCTET_STREAM);
+    }
+
     @Test
     public void fromBytes_byteArrayNotNull_createsCopy() {
         byte[] original = {0x1, 0x2, 0x3, 0x4};

core/sdk-core/src/test/java/software/amazon/awssdk/core/internal/async/ByteArrayAsyncRequestBodyTest.java

@@ -21,6 +21,7 @@
 import org.junit.Test;
 import org.reactivestreams.Subscriber;
 import org.reactivestreams.Subscription;
+import software.amazon.awssdk.core.internal.util.Mimetype;
 
 public class ByteArrayAsyncRequestBodyTest {
     private class testSubscriber implements Subscriber<ByteBuffer> {
@@ -54,7 +55,8 @@ public void onComplete() {
 
     @Test
     public void concurrentRequests_shouldCompleteNormally() {
-        ByteArrayAsyncRequestBody byteArrayReq = new ByteArrayAsyncRequestBody("Hello World!".getBytes());
+        ByteArrayAsyncRequestBody byteArrayReq = new ByteArrayAsyncRequestBody("Hello World!".getBytes(),
+                                                                               Mimetype.MIMETYPE_OCTET_STREAM);
         byteArrayReq.subscribe(subscriber);
         assertTrue(subscriber.onCompleteCalled.get());
     }

services/s3/src/main/java/software/amazon/awssdk/services/s3/checksums/ChecksumCalculatingAsyncRequestBody.java

@@ -40,6 +40,11 @@ public Optional<Long> contentLength() {
         return wrapped.contentLength();
     }
 
+    @Override
+    public String contentType() {
+        return wrapped.contentType();
+    }
+
     @Override
     public void subscribe(Subscriber<? super ByteBuffer> s) {
         sdkChecksum.reset();