chibenwa commented on code in PR #2896:
URL: https://github.com/apache/james-project/pull/2896#discussion_r2661027425


##########
server/protocols/jmap-rfc-8621-integration-tests/jmap-rfc-8621-integration-tests-common/src/main/scala/org/apache/james/jmap/rfc8621/contract/BlobCopyContract.scala:
##########
@@ -0,0 +1,265 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *  http://www.apache.org/licenses/LICENSE-2.0                  *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.jmap.rfc8621.contract
+
+import java.io.ByteArrayInputStream
+import java.nio.charset.StandardCharsets
+
+import io.netty.handler.codec.http.HttpHeaderNames.ACCEPT
+import io.restassured.RestAssured.{`given`, requestSpecification}
+import io.restassured.http.ContentType
+import net.javacrumbs.jsonunit.assertj.JsonAssertions.assertThatJson
+import org.apache.http.HttpStatus.{SC_CREATED, SC_OK}
+import org.apache.james.GuiceJamesServer
+import org.apache.james.jmap.core.AccountId
+import org.apache.james.jmap.http.UserCredential
+import org.apache.james.jmap.rfc8621.contract.BlobCopyContract.BYTES
+import 
org.apache.james.jmap.rfc8621.contract.Fixture.{ACCEPT_RFC8621_VERSION_HEADER, 
ALICE, ALICE_PASSWORD, BOB, BOB_PASSWORD, DOMAIN, _2_DOT_DOMAIN, authScheme, 
baseRequestSpecBuilder, ACCOUNT_ID => BOB_ACCOUNT_ID}
+import org.apache.james.junit.categories.BasicFeature
+import org.apache.james.utils.DataProbeImpl
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.experimental.categories.Category
+import org.junit.jupiter.api.{BeforeEach, Test}
+import play.api.libs.json.{JsObject, JsString, Json}
+
+object BlobCopyContract {
+  val BYTES: Array[Byte] = "123456789\r\n".repeat(1024 * 
64).getBytes(StandardCharsets.UTF_8)
+}
+
+trait BlobCopyContract {
+  @BeforeEach
+  def setUp(server: GuiceJamesServer): Unit = {
+    server.getProbe(classOf[DataProbeImpl])
+      .fluent
+      .addDomain(DOMAIN.asString)
+      .addDomain(_2_DOT_DOMAIN.asString())
+      .addUser(BOB.asString, BOB_PASSWORD)
+      .addUser(ALICE.asString(), ALICE_PASSWORD)
+
+    requestSpecification = baseRequestSpecBuilder(server)
+      .setAuth(authScheme(UserCredential(BOB, BOB_PASSWORD)))
+      .build
+  }
+
+  @Category(Array(classOf[BasicFeature]))
+  @Test
+  def shouldCopyBlobBetweenAccountsWhenDelegated(server: GuiceJamesServer): 
Unit = {
+    // Alice delegates Bob to access her account
+    server.getProbe(classOf[DataProbeImpl]).addAuthorizedUser(ALICE, BOB)
+
+    // Bob uploads a blob to his account
+    val uploadResponse: String = `given`
+      .basePath("")
+      .header(ACCEPT.toString, ACCEPT_RFC8621_VERSION_HEADER)
+      .contentType(ContentType.BINARY)
+      .body(BYTES)
+    .when
+      .post(s"/upload/$BOB_ACCOUNT_ID")
+    .`then`
+      .statusCode(SC_CREATED)
+      .extract
+      .body
+      .asString
+
+    val bobBlobId: String = 
Json.parse(uploadResponse).\("blobId").get.asInstanceOf[JsString].value
+
+    val aliceAccountId: String = AccountId.from(ALICE).toOption.get.id.value
+
+    // Bob copies the blob from his account to Alice's account
+    val request: String =
+      s"""{
+         |  "using": [ "urn:ietf:params:jmap:core" ],
+         |  "methodCalls": [[
+         |    "Blob/copy",
+         |    {
+         |      "fromAccountId": "$BOB_ACCOUNT_ID",
+         |      "accountId": "$aliceAccountId",
+         |      "blobIds": [ "$bobBlobId" ]
+         |    },
+         |    "c1"]]
+         |}""".stripMargin
+
+    val response: String = `given`
+      .header(ACCEPT.toString, ACCEPT_RFC8621_VERSION_HEADER)
+      .body(request)
+    .when
+      .post
+    .`then`
+      .statusCode(SC_OK)
+      .contentType(ContentType.JSON)
+      .extract
+      .body
+      .asString
+
+    val copied: JsObject = (Json.parse(response) \ 
"methodResponses")(0)(1).\("copied").get.as[JsObject]
+    val copiedBlobId: String = copied.value(bobBlobId).as[JsString].value

Review Comment:
   I think using restassured JSON extraction would be less boiler plate, easier 
and more idiomatic of our code base.



##########
server/protocols/jmap-rfc-8621-integration-tests/jmap-rfc-8621-integration-tests-common/src/main/scala/org/apache/james/jmap/rfc8621/contract/BlobCopyContract.scala:
##########
@@ -0,0 +1,265 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *  http://www.apache.org/licenses/LICENSE-2.0                  *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.jmap.rfc8621.contract
+
+import java.io.ByteArrayInputStream
+import java.nio.charset.StandardCharsets
+
+import io.netty.handler.codec.http.HttpHeaderNames.ACCEPT
+import io.restassured.RestAssured.{`given`, requestSpecification}
+import io.restassured.http.ContentType
+import net.javacrumbs.jsonunit.assertj.JsonAssertions.assertThatJson
+import org.apache.http.HttpStatus.{SC_CREATED, SC_OK}
+import org.apache.james.GuiceJamesServer
+import org.apache.james.jmap.core.AccountId
+import org.apache.james.jmap.http.UserCredential
+import org.apache.james.jmap.rfc8621.contract.BlobCopyContract.BYTES
+import 
org.apache.james.jmap.rfc8621.contract.Fixture.{ACCEPT_RFC8621_VERSION_HEADER, 
ALICE, ALICE_PASSWORD, BOB, BOB_PASSWORD, DOMAIN, _2_DOT_DOMAIN, authScheme, 
baseRequestSpecBuilder, ACCOUNT_ID => BOB_ACCOUNT_ID}
+import org.apache.james.junit.categories.BasicFeature
+import org.apache.james.utils.DataProbeImpl
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.experimental.categories.Category
+import org.junit.jupiter.api.{BeforeEach, Test}
+import play.api.libs.json.{JsObject, JsString, Json}
+
+object BlobCopyContract {
+  val BYTES: Array[Byte] = "123456789\r\n".repeat(1024 * 
64).getBytes(StandardCharsets.UTF_8)
+}
+
+trait BlobCopyContract {

Review Comment:
   We get a few more tests to cover
   
   Alice delegates to Bob
   Alice uploads a blob to her account
   Alice copies it into bob account
   
   Alice delegates to bob 
   Cedric delegates to bob
   Cedric uploads a blob
   Bob copies it from Cedric account onto Bob account
   
   Can we be adding those missing tests?



##########
server/protocols/jmap-rfc-8621-integration-tests/jmap-rfc-8621-integration-tests-common/src/main/scala/org/apache/james/jmap/rfc8621/contract/BlobCopyContract.scala:
##########
@@ -0,0 +1,265 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *  http://www.apache.org/licenses/LICENSE-2.0                  *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.jmap.rfc8621.contract
+
+import java.io.ByteArrayInputStream
+import java.nio.charset.StandardCharsets
+
+import io.netty.handler.codec.http.HttpHeaderNames.ACCEPT
+import io.restassured.RestAssured.{`given`, requestSpecification}
+import io.restassured.http.ContentType
+import net.javacrumbs.jsonunit.assertj.JsonAssertions.assertThatJson
+import org.apache.http.HttpStatus.{SC_CREATED, SC_OK}
+import org.apache.james.GuiceJamesServer
+import org.apache.james.jmap.core.AccountId
+import org.apache.james.jmap.http.UserCredential
+import org.apache.james.jmap.rfc8621.contract.BlobCopyContract.BYTES
+import 
org.apache.james.jmap.rfc8621.contract.Fixture.{ACCEPT_RFC8621_VERSION_HEADER, 
ALICE, ALICE_PASSWORD, BOB, BOB_PASSWORD, DOMAIN, _2_DOT_DOMAIN, authScheme, 
baseRequestSpecBuilder, ACCOUNT_ID => BOB_ACCOUNT_ID}
+import org.apache.james.junit.categories.BasicFeature
+import org.apache.james.utils.DataProbeImpl
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.experimental.categories.Category
+import org.junit.jupiter.api.{BeforeEach, Test}
+import play.api.libs.json.{JsObject, JsString, Json}
+
+object BlobCopyContract {
+  val BYTES: Array[Byte] = "123456789\r\n".repeat(1024 * 
64).getBytes(StandardCharsets.UTF_8)
+}
+
+trait BlobCopyContract {

Review Comment:
   Please have 1 test regarding quota exceeded on the target account and ensure 
that we delete older blobs in order to make room for the new one



##########
server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/BlobCopyMethod.scala:
##########
@@ -0,0 +1,151 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *  http://www.apache.org/licenses/LICENSE-2.0                  *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.jmap.method
+
+import eu.timepit.refined.auto._
+import jakarta.inject.Inject
+import org.apache.james.core.Username
+import org.apache.james.jmap.api.model.UploadId
+import org.apache.james.jmap.api.upload.UploadService
+import org.apache.james.jmap.core.CapabilityIdentifier.{CapabilityIdentifier, 
JMAP_CORE}
+import org.apache.james.jmap.core.Invocation.{Arguments, MethodName}
+import org.apache.james.jmap.core.SetError.SetErrorDescription
+import org.apache.james.jmap.core.{BlobCopyRequest, BlobCopyResponse, 
ErrorCode, Invocation, JmapRfc8621Configuration, SessionTranslator, SetError}
+import org.apache.james.jmap.json.BlobCopySerializer
+import org.apache.james.jmap.mail.BlobId
+import org.apache.james.jmap.mail.MDNParse.UnparsedBlobId
+import org.apache.james.jmap.routes.{Blob, BlobNotFoundException, 
BlobResolvers, SessionSupplier}
+import org.apache.james.mailbox.{MailboxSession, SessionProvider}
+import org.apache.james.metrics.api.MetricFactory
+import org.apache.james.util.ReactorUtils
+import org.reactivestreams.Publisher
+import org.slf4j.{Logger, LoggerFactory}
+import reactor.core.scala.publisher.{SFlux, SMono}
+
+import scala.jdk.OptionConverters._
+
+sealed trait CopyResult {
+  def sourceBlobId: BlobId
+}
+case class Copied(sourceBlobId: BlobId, copied: BlobId) extends CopyResult
+case class NotCopied(sourceBlobId: BlobId, error: SetError) extends CopyResult
+case class CopyResults(results: Seq[CopyResult]) {
+  def copied: Option[Map[BlobId, BlobId]] =
+    Option(results.collect { case Copied(source, copied) => source -> copied 
}.toMap).filter(_.nonEmpty)
+
+  def notCopied: Option[Map[BlobId, SetError]] =
+    Option(results.collect { case NotCopied(source, error) => source -> error 
}.toMap).filter(_.nonEmpty)
+}
+
+case class FromAccountNotFoundException() extends RuntimeException
+
+class BlobCopyMethod @Inject()(val metricFactory: MetricFactory,
+                               val sessionSupplier: SessionSupplier,
+                               val sessionTranslator: SessionTranslator,
+                               val sessionProvider: SessionProvider,
+                               val blobResolvers: BlobResolvers,
+                               val uploadService: UploadService,
+                               val serializer: BlobCopySerializer,
+                               val configuration: JmapRfc8621Configuration) 
extends MethodRequiringAccountId[BlobCopyRequest] {
+  private val LOGGER: Logger = LoggerFactory.getLogger(classOf[BlobCopyMethod])
+
+  override val methodName: MethodName = MethodName("Blob/copy")
+  override val requiredCapabilities: Set[CapabilityIdentifier] = Set(JMAP_CORE)
+
+  override def doProcess(capabilities: Set[CapabilityIdentifier], invocation: 
InvocationWithContext, mailboxSession: MailboxSession, request: 
BlobCopyRequest): Publisher[InvocationWithContext] =
+    resolveSourceSession(request, mailboxSession)
+      .flatMap(sourceSession => copyBlobs(request, sourceSession, 
targetSession = mailboxSession))
+      .map(response => asInvocation(response, invocation))
+      .onErrorResume {
+        case _: FromAccountNotFoundException =>
+          SMono.just(asErrorInvocation(ErrorCode.FromAccountNotFound, 
invocation))
+        case e =>
+          LOGGER.error("Failed to copy blob", e)
+          SMono.just(asErrorInvocation(ErrorCode.ServerFail, e.getMessage, 
invocation))
+      }
+
+  private def resolveSourceSession(request: BlobCopyRequest, mailboxSession: 
MailboxSession): SMono[MailboxSession] =
+    if (request.fromAccountId.equals(request.accountId)) {
+      SMono.just(mailboxSession)
+    } else {
+      mailboxSession.getLoggedInUser.toScala
+        .filter(loggedInUser => 
sessionTranslator.hasAccountId(request.fromAccountId)(loggedInUser))
+        .map(createSourceSession)
+        .getOrElse(SMono.error(FromAccountNotFoundException()))
+    }
+
+  private def createSourceSession(loggedInUser: Username): 
SMono[MailboxSession] =
+    SMono.fromCallable(() => 
sessionProvider.authenticate(loggedInUser).withoutDelegation())
+      .subscribeOn(ReactorUtils.BLOCKING_CALL_WRAPPER)
+
+  private def asInvocation(response: BlobCopyResponse, invocation: 
InvocationWithContext): InvocationWithContext =
+    InvocationWithContext(
+      Invocation(
+        methodName = methodName,
+        arguments = Arguments(serializer.serializeBlobCopyResponse(response)),
+        methodCallId = invocation.invocation.methodCallId),
+      invocation.processingContext)
+
+  private def asErrorInvocation(errorCode: ErrorCode, invocation: 
InvocationWithContext): InvocationWithContext =
+    InvocationWithContext(
+      Invocation.error(errorCode, invocation.invocation.methodCallId),
+      invocation.processingContext)
+
+  private def asErrorInvocation(errorCode: ErrorCode, description: String = 
"", invocation: InvocationWithContext): InvocationWithContext =
+    InvocationWithContext(
+      Invocation.error(errorCode, description, 
invocation.invocation.methodCallId),
+      invocation.processingContext)
+
+  override def getRequest(mailboxSession: MailboxSession, invocation: 
Invocation): Either[Exception, BlobCopyRequest] =
+    
serializer.deserializeBlobCopyRequest(invocation.arguments.value).asEitherRequest
+      .flatMap(request => request.validate(configuration).map(_ => request))
+
+  private def copyBlobs(request: BlobCopyRequest, sourceSession: 
MailboxSession, targetSession: MailboxSession): SMono[BlobCopyResponse] =
+    SFlux.fromIterable(request.blobIds.value)
+      .flatMap(blobId => copyBlob(blobId, sourceSession, targetSession), 
ReactorUtils.DEFAULT_CONCURRENCY)
+      .collectSeq()
+      .map(CopyResults)
+      .map(results => BlobCopyResponse(request.fromAccountId, 
request.accountId, results.copied, results.notCopied))
+
+  private def copyBlob(unparsedBlobId: UnparsedBlobId, sourceSession: 
MailboxSession, targetSession: MailboxSession): SMono[CopyResult] =
+    SMono.fromTry(BlobId.of(unparsedBlobId))
+      .flatMap { sourceBlobId =>
+        blobResolvers.resolve(sourceBlobId, sourceSession)
+          .flatMap(blob => uploadBlob(sourceBlobId, blob, targetSession))
+          .onErrorResume(e => SMono.just(NotCopied(sourceBlobId, 
asSetError(sourceBlobId, sourceSession, targetSession, e))))
+      }
+
+  private def uploadBlob(sourceBlobId: BlobId, blob: Blob, targetSession: 
MailboxSession): SMono[CopyResult] =
+    SMono.fromPublisher(uploadService.upload(blob.content, blob.contentType, 
targetSession.getUser))
+      .map(upload => Copied(sourceBlobId, asBlobId(upload.uploadId)))
+
+  private def asBlobId(uploadId: UploadId): BlobId =
+    BlobId.of(s"uploads-${uploadId.asString()}").get

Review Comment:
   This line is fishy and seems copy and pasted from somewhere else.
   
   I'd like it is shared so that wedo not suffer from "coupling" pitfall



##########
server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/BlobCopyMethod.scala:
##########
@@ -0,0 +1,151 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ *  http://www.apache.org/licenses/LICENSE-2.0                  *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.jmap.method
+
+import eu.timepit.refined.auto._
+import jakarta.inject.Inject
+import org.apache.james.core.Username
+import org.apache.james.jmap.api.model.UploadId
+import org.apache.james.jmap.api.upload.UploadService
+import org.apache.james.jmap.core.CapabilityIdentifier.{CapabilityIdentifier, 
JMAP_CORE}
+import org.apache.james.jmap.core.Invocation.{Arguments, MethodName}
+import org.apache.james.jmap.core.SetError.SetErrorDescription
+import org.apache.james.jmap.core.{BlobCopyRequest, BlobCopyResponse, 
ErrorCode, Invocation, JmapRfc8621Configuration, SessionTranslator, SetError}
+import org.apache.james.jmap.json.BlobCopySerializer
+import org.apache.james.jmap.mail.BlobId
+import org.apache.james.jmap.mail.MDNParse.UnparsedBlobId
+import org.apache.james.jmap.routes.{Blob, BlobNotFoundException, 
BlobResolvers, SessionSupplier}
+import org.apache.james.mailbox.{MailboxSession, SessionProvider}
+import org.apache.james.metrics.api.MetricFactory
+import org.apache.james.util.ReactorUtils
+import org.reactivestreams.Publisher
+import org.slf4j.{Logger, LoggerFactory}
+import reactor.core.scala.publisher.{SFlux, SMono}
+
+import scala.jdk.OptionConverters._
+
+sealed trait CopyResult {
+  def sourceBlobId: BlobId
+}
+case class Copied(sourceBlobId: BlobId, copied: BlobId) extends CopyResult
+case class NotCopied(sourceBlobId: BlobId, error: SetError) extends CopyResult
+case class CopyResults(results: Seq[CopyResult]) {
+  def copied: Option[Map[BlobId, BlobId]] =
+    Option(results.collect { case Copied(source, copied) => source -> copied 
}.toMap).filter(_.nonEmpty)
+
+  def notCopied: Option[Map[BlobId, SetError]] =
+    Option(results.collect { case NotCopied(source, error) => source -> error 
}.toMap).filter(_.nonEmpty)
+}
+
+case class FromAccountNotFoundException() extends RuntimeException
+
+class BlobCopyMethod @Inject()(val metricFactory: MetricFactory,
+                               val sessionSupplier: SessionSupplier,
+                               val sessionTranslator: SessionTranslator,
+                               val sessionProvider: SessionProvider,
+                               val blobResolvers: BlobResolvers,
+                               val uploadService: UploadService,
+                               val serializer: BlobCopySerializer,
+                               val configuration: JmapRfc8621Configuration) 
extends MethodRequiringAccountId[BlobCopyRequest] {
+  private val LOGGER: Logger = LoggerFactory.getLogger(classOf[BlobCopyMethod])
+
+  override val methodName: MethodName = MethodName("Blob/copy")
+  override val requiredCapabilities: Set[CapabilityIdentifier] = Set(JMAP_CORE)
+
+  override def doProcess(capabilities: Set[CapabilityIdentifier], invocation: 
InvocationWithContext, mailboxSession: MailboxSession, request: 
BlobCopyRequest): Publisher[InvocationWithContext] =
+    resolveSourceSession(request, mailboxSession)
+      .flatMap(sourceSession => copyBlobs(request, sourceSession, 
targetSession = mailboxSession))
+      .map(response => asInvocation(response, invocation))
+      .onErrorResume {
+        case _: FromAccountNotFoundException =>
+          SMono.just(asErrorInvocation(ErrorCode.FromAccountNotFound, 
invocation))
+        case e =>
+          LOGGER.error("Failed to copy blob", e)
+          SMono.just(asErrorInvocation(ErrorCode.ServerFail, e.getMessage, 
invocation))
+      }
+
+  private def resolveSourceSession(request: BlobCopyRequest, mailboxSession: 
MailboxSession): SMono[MailboxSession] =
+    if (request.fromAccountId.equals(request.accountId)) {
+      SMono.just(mailboxSession)
+    } else {
+      mailboxSession.getLoggedInUser.toScala
+        .filter(loggedInUser => 
sessionTranslator.hasAccountId(request.fromAccountId)(loggedInUser))
+        .map(createSourceSession)
+        .getOrElse(SMono.error(FromAccountNotFoundException()))
+    }
+
+  private def createSourceSession(loggedInUser: Username): 
SMono[MailboxSession] =
+    SMono.fromCallable(() => 
sessionProvider.authenticate(loggedInUser).withoutDelegation())
+      .subscribeOn(ReactorUtils.BLOCKING_CALL_WRAPPER)
+
+  private def asInvocation(response: BlobCopyResponse, invocation: 
InvocationWithContext): InvocationWithContext =
+    InvocationWithContext(
+      Invocation(
+        methodName = methodName,
+        arguments = Arguments(serializer.serializeBlobCopyResponse(response)),
+        methodCallId = invocation.invocation.methodCallId),
+      invocation.processingContext)
+
+  private def asErrorInvocation(errorCode: ErrorCode, invocation: 
InvocationWithContext): InvocationWithContext =
+    InvocationWithContext(
+      Invocation.error(errorCode, invocation.invocation.methodCallId),
+      invocation.processingContext)
+
+  private def asErrorInvocation(errorCode: ErrorCode, description: String = 
"", invocation: InvocationWithContext): InvocationWithContext =
+    InvocationWithContext(
+      Invocation.error(errorCode, description, 
invocation.invocation.methodCallId),
+      invocation.processingContext)
+
+  override def getRequest(mailboxSession: MailboxSession, invocation: 
Invocation): Either[Exception, BlobCopyRequest] =
+    
serializer.deserializeBlobCopyRequest(invocation.arguments.value).asEitherRequest
+      .flatMap(request => request.validate(configuration).map(_ => request))
+
+  private def copyBlobs(request: BlobCopyRequest, sourceSession: 
MailboxSession, targetSession: MailboxSession): SMono[BlobCopyResponse] =
+    SFlux.fromIterable(request.blobIds.value)
+      .flatMap(blobId => copyBlob(blobId, sourceSession, targetSession), 
ReactorUtils.DEFAULT_CONCURRENCY)
+      .collectSeq()
+      .map(CopyResults)
+      .map(results => BlobCopyResponse(request.fromAccountId, 
request.accountId, results.copied, results.notCopied))
+
+  private def copyBlob(unparsedBlobId: UnparsedBlobId, sourceSession: 
MailboxSession, targetSession: MailboxSession): SMono[CopyResult] =
+    SMono.fromTry(BlobId.of(unparsedBlobId))
+      .flatMap { sourceBlobId =>
+        blobResolvers.resolve(sourceBlobId, sourceSession)
+          .flatMap(blob => uploadBlob(sourceBlobId, blob, targetSession))
+          .onErrorResume(e => SMono.just(NotCopied(sourceBlobId, 
asSetError(sourceBlobId, sourceSession, targetSession, e))))
+      }
+
+  private def uploadBlob(sourceBlobId: BlobId, blob: Blob, targetSession: 
MailboxSession): SMono[CopyResult] =
+    SMono.fromPublisher(uploadService.upload(blob.content, blob.contentType, 
targetSession.getUser))
+      .map(upload => Copied(sourceBlobId, asBlobId(upload.uploadId)))

Review Comment:
   ```suggestion
         .map(Copied(sourceBlobId, asBlobId(_.uploadId)))
   ```
   
   ?



##########
server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/core/BlobCopy.scala:
##########
@@ -0,0 +1,40 @@
+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you under the Apache License, Version 2.0 (the            *
+ * "License"); you may not use this file except in compliance   *
+ * with the License.  You may obtain a copy of the License at   *
+ *                                                              *
+ * http://www.apache.org/licenses/LICENSE-2.0                   *
+ *                                                              *
+ * Unless required by applicable law or agreed to in writing,   *
+ * software distributed under the License is distributed on an  *
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
+ * KIND, either express or implied.  See the License for the    *
+ * specific language governing permissions and limitations      *
+ * under the License.                                           *
+ ****************************************************************/
+
+package org.apache.james.jmap.core
+
+import org.apache.james.jmap.mail.{BlobId, BlobIds, RequestTooLargeException}
+import org.apache.james.jmap.method.{ValidableRequest, WithAccountId}
+
+case class BlobCopyRequest(fromAccountId: AccountId,
+                           accountId: AccountId,
+                           blobIds: BlobIds) extends WithAccountId with 
ValidableRequest {
+  override def validate(configuration: JmapRfc8621Configuration): 
Either[Exception, BlobCopyRequest] =
+    if (blobIds.value.size > configuration.maxObjectsInSet.value.value) {
+      Left(RequestTooLargeException(s"Too many items in a Blob/copy request. " 
+
+        s"Got ${blobIds.value.size} items instead of maximum 
${configuration.maxObjectsInSet.value.value}."))

Review Comment:
   ```suggestion
         Left(RequestTooLargeException(s"""Too many items in a Blob/copy 
request. 
           Got ${blobIds.value.size} items instead of maximum 
${configuration.maxObjectsInSet.value.value}."""))
   ```
   
   (nitpick)



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