Creating and deleting bucket. Checking if it exists akka#1546

docs/src/main/paradox/s3.md

@@ -128,6 +128,50 @@ Scala
 Java
 : @@snip [snip](/s3/src/test/java/docs/javadsl/S3Test.java) { #list-bucket-attributes }
 
+
+## Bucket management
+
+Bucket management API provides functionality for both Sources and Futures / CompletionStages. 
+In case of the Future API user can specify attributes to the request in the method itself and as for Sources it can be done via method `.withAttributes`.
+For more information about attributes see: @scaladoc[S3Attributes](akka.stream.alpakka.s3.S3Attributes$) and @scaladoc[Attributes](akka.stream.Attributes)
+
+### Make bucket
+In order to create a bucket in S3 you need to specify it's unique name. This value has to be set accordingly to the [requirements](https://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrail-s3-bucket-naming-requirements.html).
+The bucket will be created in the region specified in the settings.
+
+Scala
+: @@snip [snip](/s3/src/test/scala/docs/scaladsl/S3SourceSpec.scala) { #make-bucket }
+
+Java
+: @@snip [snip](/s3/src/test/java/docs/javadsl/S3Test.java) { #make-bucket }
+
+
+### Delete bucket
+To delete a bucket you need to specify its name and the bucket needs to be empty.
+
+Scala
+: @@snip [snip](/s3/src/test/scala/docs/scaladsl/S3SourceSpec.scala) { #delete-bucket }
+
+Java
+: @@snip [snip](/s3/src/test/java/docs/javadsl/S3Test.java) { #delete-bucket }
+
+
+### Check if bucket exists
+It is possible to check if a bucket exists and the user has rights to perform a `listBucket` operation.
+
+There are 3 possible outcomes:
+
+- The user has access to the existing bucket, then it will return `AccessGranted`
+- The user doesn't have access but the bucket exists so `AccessDenied` will be returned
+- The bucket doesn't exist, the method will return `NotExists`
+
+Scala
+: @@snip [snip](/s3/src/test/scala/docs/scaladsl/S3SourceSpec.scala) { #check-if-bucket-exists }
+
+Java
+: @@snip [snip](/s3/src/test/java/docs/javadsl/S3Test.java) { #check-if-bucket-exists }
+
+
 ## Running the example code
 
 The code in this guide is part of runnable tests of this project. You are welcome to edit the code and run it in sbt.

s3/src/main/scala/akka/stream/alpakka/s3/impl/HttpRequests.scala

@@ -60,6 +60,14 @@ import scala.concurrent.{ExecutionContext, Future}
       .withDefaultHeaders(s3Headers)
   }
 
+  def bucketManagementRequest(
+      s3Location: S3Location,
+      method: HttpMethod,
+      headers: Seq[HttpHeader] = Seq.empty[HttpHeader]
+  )(implicit conf: S3Settings): HttpRequest =
+    s3Request(s3Location = s3Location, method = method)
+      .withDefaultHeaders(headers)
+
   def uploadRequest(s3Location: S3Location,
                     payload: Source[ByteString, _],
                     contentLength: Long,

s3/src/main/scala/akka/stream/alpakka/s3/impl/S3Stream.scala

@@ -19,6 +19,7 @@ import akka.http.scaladsl.model.StatusCodes.{NoContent, NotFound, OK}
 import akka.http.scaladsl.model.headers.{`Content-Length`, `Content-Type`, ByteRange, CustomHeader}
 import akka.http.scaladsl.model.{headers => http, _}
 import akka.http.scaladsl.unmarshalling.{Unmarshal, Unmarshaller}
+import akka.stream.alpakka.s3.BucketAccess.{AccessDenied, AccessGranted, NotExists}
 import akka.stream.{ActorMaterializer, Attributes, Materializer}
 import akka.stream.alpakka.s3.impl.auth.{CredentialScope, Signer, SigningKey}
 import akka.stream.alpakka.s3._
@@ -259,6 +260,99 @@ import akka.util.ByteString
       case _ => downloadRequest
     }
 
+  def makeBucket(bucket: String): Source[Done, NotUsed] =
+    bucketManagementRequest[Done](
+      bucket = bucket,
+      method = HttpMethods.PUT,
+      process = processBucketLifecycleResponse
+    )
+
+  def makeBucketF(bucket: String)(implicit mat: Materializer, attr: Attributes): Future[Done] =
+    makeBucket(bucket).withAttributes(attr).runWith(Sink.ignore)
+
+  def deleteBucket(bucket: String): Source[Done, NotUsed] =
+    bucketManagementRequest[Done](
+      bucket = bucket,
+      method = HttpMethods.DELETE,
+      process = processBucketLifecycleResponse
+    )
+
+  def deleteBucketF(bucket: String)(implicit mat: Materializer, attr: Attributes): Future[Done] =
+    deleteBucket(bucket).withAttributes(attr).runWith(Sink.ignore)
+
+  def checkIfBucketExists(bucketName: String): Source[BucketAccess, NotUsed] =
+    bucketManagementRequest[BucketAccess](
+      bucket = bucketName,
+      method = HttpMethods.HEAD,
+      process = processCheckIfExistsResponse
+    )
+
+  def checkIfBucketExistsF(bucket: String)(implicit mat: Materializer, attr: Attributes): Future[BucketAccess] =
+    checkIfBucketExists(bucket).withAttributes(attr).runWith(Sink.head)
+
+  private def bucketManagementRequest[T](
+      bucket: String,
+      method: HttpMethod,
+      process: (HttpResponse, Materializer) => Future[T]
+  ): Source[T, NotUsed] =
+    Setup
+      .source { mat => implicit attr =>
+        implicit val sys: ActorSystem = mat.system
+        implicit val conf: S3Settings = resolveSettings()
+
+        val location = S3Location(bucket = bucket, key = "")
+
+        signAndRequest(
+          requestHeaders(
+            HttpRequests.bucketManagementRequest(location, method),
+            None
+          )
+        ).mapAsync(1) { response =>
+          process(response, mat)
+        }
+      }
+      .mapMaterializedValue(_ => NotUsed)
+
+  private def processBucketLifecycleResponse(response: HttpResponse, materializer: Materializer): Future[Done] = {
+    import materializer.executionContext
+
+    implicit val mat: Materializer = materializer
+
+    response match {
+      case HttpResponse(status, _, entity, _) if status.isSuccess() =>
+        entity.discardBytes().future()
+      case HttpResponse(_, _, entity, _) =>
+        Unmarshal(entity).to[String].map { err =>
+          throw new S3Exception(err)
+        }
+    }
+  }
+
+  private def processCheckIfExistsResponse(response: HttpResponse, materializer: Materializer): Future[BucketAccess] = {
+    import materializer.executionContext
+
+    implicit val mat: Materializer = materializer
+
+    response match {
+      case code @ HttpResponse(StatusCodes.NotFound | StatusCodes.Forbidden | StatusCodes.OK, _, entity, _) =>
+        entity
+          .discardBytes()
+          .future()
+          .map(
+            _ =>
+              code.status match {
+                case StatusCodes.NotFound => NotExists
+                case StatusCodes.Forbidden => AccessDenied
+                case StatusCodes.OK => AccessGranted
+            }
+          )
+      case HttpResponse(_, _, entity, _) =>
+        Unmarshal(entity).to[String].map { err =>
+          throw new S3Exception(err)
+        }
+    }
+  }
+
   /**
    * Uploads a stream of ByteStrings to a specified location as a multipart upload.
    */

s3/src/main/scala/akka/stream/alpakka/s3/javadsl/S3.scala

@@ -12,6 +12,7 @@ import akka.http.javadsl.model._
 import akka.http.javadsl.model.headers.ByteRange
 import akka.http.scaladsl.model.headers.{ByteRange => ScalaByteRange}
 import akka.http.scaladsl.model.{ContentType => ScalaContentType, HttpMethod => ScalaHttpMethod}
+import akka.stream.{Attributes, Materializer}
 import akka.stream.alpakka.s3.headers.{CannedAcl, ServerSideEncryption}
 import akka.stream.alpakka.s3.impl._
 import akka.stream.alpakka.s3._
@@ -324,7 +325,7 @@ object S3 {
    * @param key the s3 object key
    * @param contentType an optional [[akka.http.javadsl.model.ContentType ContentType]]
    * @param s3Headers any headers you want to add
-   * @return a [[akka.stream.javadsl.Sink Sink]] that accepts [[akka.util.ByteString ByteString]]'s and materializes to a [[ava.util.concurrent.CompletionStage CompletionStage]] of [[MultipartUploadResult]]
+   * @return a [[akka.stream.javadsl.Sink Sink]] that accepts [[akka.util.ByteString ByteString]]'s and materializes to a [[java.util.concurrent.CompletionStage CompletionStage]] of [[MultipartUploadResult]]
    */
   def multipartUpload(bucket: String,
                       key: String,
@@ -353,7 +354,7 @@ object S3 {
    *
    * @param bucket the s3 bucket name
    * @param key the s3 object key
-   * @return a [[akka.stream.javadsl.Sink Sink]] that accepts [[akka.util.ByteString ByteString]]'s and materializes to a [[ava.util.concurrent.CompletionStage CompletionStage]] of [[MultipartUploadResult]]
+   * @return a [[akka.stream.javadsl.Sink Sink]] that accepts [[akka.util.ByteString ByteString]]'s and materializes to a [[java.util.concurrent.CompletionStage CompletionStage]] of [[MultipartUploadResult]]
    */
   def multipartUpload(bucket: String, key: String): Sink[ByteString, CompletionStage[MultipartUploadResult]] =
     multipartUpload(bucket, key, ContentTypes.APPLICATION_OCTET_STREAM)
@@ -466,6 +467,107 @@ object S3 {
                     targetKey: String): RunnableGraph[CompletionStage[MultipartUploadResult]] =
     multipartCopy(sourceBucket, sourceKey, targetBucket, targetKey, ContentTypes.APPLICATION_OCTET_STREAM, S3Headers())
 
+  /**
+   * Create new bucket with a given name
+   *
+   * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketPUT.html
+   * @param bucketName bucket name
+   * @param materializer materializer to run with
+   * @param attributes attributes to run request with
+   * @return [[java.util.concurrent.CompletionStage CompletionStage]] of type [[Done]] as API doesn't return any additional information
+   */
+  def makeBucket(bucketName: String, materializer: Materializer, attributes: Attributes): CompletionStage[Done] =
+    S3Stream.makeBucketF(bucketName)(materializer, attributes).toJava
+
+  /**
+   * Create new bucket with a given name
+   *
+   * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketPUT.html
+   * @param bucketName bucket name
+   * @param materializer materializer to run with
+   * @return [[java.util.concurrent.CompletionStage CompletionStage]] of type [[Done]] as API doesn't return any additional information
+   */
+  def makeBucket(bucketName: String, materializer: Materializer): CompletionStage[Done] =
+    S3Stream.makeBucketF(bucketName)(materializer, Attributes()).toJava
+
+  /**
+   * Create new bucket with a given name
+   *
+   * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketPUT.html
+   * @param bucketName bucket name
+   * @return [[akka.stream.javadsl.Source Source]] of type [[Done]] as API doesn't return any additional information
+   */
+  def makeBucket(bucketName: String): Source[Done, NotUsed] =
+    S3Stream.makeBucket(bucketName).asJava
+
+  /**
+   * Delete bucket with a given name
+   *
+   * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketDELETE.html
+   * @param bucketName   bucket name
+   * @param materializer materializer to run with
+   * @param attributes attributes to run request with
+   * @return [[java.util.concurrent.CompletionStage CompletionStage]] of type [[Done]] as API doesn't return any additional information
+   */
+  def deleteBucket(bucketName: String, materializer: Materializer, attributes: Attributes): CompletionStage[Done] =
+    S3Stream.deleteBucketF(bucketName)(materializer, attributes).toJava
+
+  /**
+   * Delete bucket with a given name
+   *
+   * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketDELETE.html
+   * @param bucketName   bucket name
+   * @param materializer materializer to run with
+   * @return [[java.util.concurrent.CompletionStage CompletionStage]] of type [[Done]] as API doesn't return any additional information
+   */
+  def deleteBucket(bucketName: String, materializer: Materializer): CompletionStage[Done] =
+    S3Stream.deleteBucketF(bucketName)(materializer, Attributes()).toJava
+
+  /**
+   * Delete bucket with a given name
+   *
+   * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketDELETE.html
+   * @param bucketName   bucket name
+   * @return [[akka.stream.javadsl.Source Source]] of type [[Done]] as API doesn't return any additional information
+   */
+  def deleteBucket(bucketName: String): Source[Done, NotUsed] =
+    S3Stream.deleteBucket(bucketName).asJava
+
+  /**
+   * Checks whether the bucket exists and the user has rights to perform the `ListBucket` operation
+   *
+   * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketHEAD.html
+   * @param bucketName   bucket name
+   * @param materializer materializer to run with
+   * @param attributes attributes to run request with
+   * @return [[java.util.concurrent.CompletionStage CompletionStage]] of type [[BucketAccess]]
+   */
+  def checkIfBucketExists(bucketName: String,
+                          materializer: Materializer,
+                          attributes: Attributes): CompletionStage[BucketAccess] =
+    S3Stream.checkIfBucketExistsF(bucketName)(materializer, attributes).toJava
+
+  /**
+   * Checks whether the bucket exits and user has rights to perform ListBucket operation
+   *
+   * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketHEAD.html
+   * @param bucketName   bucket name
+   * @param materializer materializer to run with
+   * @return [[java.util.concurrent.CompletionStage CompletionStage]] of type [[BucketAccess]]
+   */
+  def checkIfBucketExists(bucketName: String, materializer: Materializer): CompletionStage[BucketAccess] =
+    S3Stream.checkIfBucketExistsF(bucketName)(materializer, Attributes()).toJava
+
+  /**
+   * Checks whether the bucket exits and user has rights to perform ListBucket operation
+   *
+   * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketHEAD.html
+   * @param bucketName   bucket name
+   * @return [[akka.stream.javadsl.Source Source]] of type [[BucketAccess]]
+   */
+  def checkIfBucketExists(bucketName: String): Source[BucketAccess, NotUsed] =
+    S3Stream.checkIfBucketExists(bucketName).asJava
+
   private def func[T, R](f: T => R) = new akka.japi.function.Function[T, R] {
     override def apply(param: T): R = f(param)
   }

s3/src/main/scala/akka/stream/alpakka/s3/model.scala

@@ -464,3 +464,23 @@ final class ObjectMetadata private (
 object ObjectMetadata {
   def apply(metadata: Seq[HttpHeader]) = new ObjectMetadata(metadata)
 }
+
+/**
+ * While checking for bucket access those responses are available
+ * 1) AccessDenied - User does have permission to perform ListBucket operation, so bucket exits
+ * 2) AccessGranted - User doesn't have rights to perform ListBucket but bucket exits
+ * 3) NotExists - Bucket doesn't exit
+ *
+ * @see https://docs.aws.amazon.com/AmazonS3/latest/API/RESTBucketHEAD.html
+ */
+sealed class BucketAccess
+
+object BucketAccess {
+  case object AccessDenied extends BucketAccess
+  case object AccessGranted extends BucketAccess
+  case object NotExists extends BucketAccess
+
+  val accessDenied: BucketAccess = AccessDenied
+  val accessGranted: BucketAccess = AccessGranted
+  val notExists: BucketAccess = NotExists
+}