Migrate to scalaxb for SOAP WSDL parsing

As noted in #327,
it looks like`salesforce-message-handler` needs to drop sbt-cxf to work with
versions of Java newer than Java 8 (the JAXB library is no longer a core part
of Java).

`scalaxb` (https://github.com/eed3si9n/scalaxb) looks like a good replacement
for `sbt-cxf`/[`wsdl2java`](https://cxf.apache.org/docs/wsdl-to-java.html),
it's maintained and has Scala-specific support:

https://index.scala-lang.org/eed3si9n/scalaxb/artifacts/scalaxb

The generated classes created by `scalaxb` are pretty similar to the ones
generated by `wsdl2java`, there was just a small wrinkle with
nillable id fields, which was not too hard to cope with.

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
           role-to-assume: ${{ secrets.GU_RIFF_RAFF_ROLE_ARN }}
 
       - name: Setup Java
-        uses: actions/setup-java@v3
+        uses: actions/setup-java@v4
         with:
           distribution: 'corretto'
           java-version: '8'

build.sbt

@@ -7,29 +7,36 @@ description:= "handle outbound messages from salesforce to update zuora and iden
 
 version := "1.0"
 
-scalaVersion := "2.12.15"
+scalaVersion := "2.12.19"
 
 scalacOptions ++= Seq(
   "-deprecation",
   "-encoding", "UTF-8",
-  "-target:jvm-1.8",
+  "-release:8",
   "-Ywarn-dead-code"
 )
 
+enablePlugins(ScalaxbPlugin)
+
+Compile / scalaxb / scalaxbPackageName := "salesforce.soap"
+Compile / scalaxb / scalaxbGenerateDispatchClient := false // we don't need to use the 'dispatch' library
+
 val AwsVersion = "1.12.705"
 
 libraryDependencies ++= Seq(
   "com.amazonaws" % "aws-lambda-java-core" % "1.2.1",
   "com.amazonaws" % "aws-java-sdk-sqs" % AwsVersion,
   "com.amazonaws" % "aws-java-sdk-s3" % AwsVersion,
+  "org.scala-lang.modules" %% "scala-xml" % "2.2.0",
+  "org.scala-lang.modules" %% "scala-parser-combinators" % "2.4.0",
   "com.typesafe" % "config" % "1.4.1",
   "org.slf4j" % "slf4j-simple" % "1.7.35",
   "com.typesafe.play" %% "play-json" % "2.9.2",
   "org.scala-lang.modules" %% "scala-xml" % "2.0.1",
-  "org.specs2" %% "specs2-core" % "4.13.2" % "test",
-  "org.specs2" %% "specs2-matcher-extra" % "4.13.2" % "test",
-  "org.specs2" %% "specs2-mock" % "4.13.2" % "test",
-  "org.hamcrest" % "hamcrest-all" % "1.3" % "test"
+  "org.specs2" %% "specs2-core" % "4.13.2" % Test,
+  "org.specs2" %% "specs2-matcher-extra" % "4.13.2" % Test,
+  "org.specs2" %% "specs2-mock" % "4.13.2" % Test,
+  "org.hamcrest" % "hamcrest-all" % "1.3" % Test
 )
 
 /* required to bump jackson versions due to CVE-2020-36518 */ 
@@ -54,13 +61,6 @@ dependencyOverrides ++= jacksonDependencies
 assembly / assemblyJarName := s"${name.value}.jar"
 assembly / assemblyOutputPath := file(s"${(assembly/assemblyJarName).value}")
 
-cxfTarget := (sourceManaged.value / "cxf" / "sfOutboundMessages" / "main")
-cxfWsdls +=
-  Wsdl(
-    id = "",
-    wsdlFile = baseDirectory.value / "wsdl/salesforce-outbound-message.wsdl"
-  )
-
 //Having a merge strategy here is necessary as there is an conflict in the file contents for the jackson libs, there are two same versions with different contents.
 //As a result we're picking the first file found on the classpath - this may not be required if the contents match in a future release
 assembly / assemblyMergeStrategy := {

project/build.properties

@@ -1 +1 @@
-sbt.version=1.5.8
+sbt.version=1.9.9

project/plugins.sbt

@@ -1,5 +1,3 @@
 addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.10")
 
-addSbtPlugin("org.scalariform" % "sbt-scalariform" % "1.8.3")
-
-addSbtPlugin("io.dapas" % "sbt-cxf" % "0.2.0")
+addSbtPlugin("org.scalaxb" % "sbt-scalaxb" % "1.12.0")

src/main/scala/com/gu/salesforce/messageHandler/MessageHandlerLambda.scala

@@ -3,17 +3,15 @@ package com.gu.salesforce.messageHandler
 import com.amazonaws.services.lambda.runtime.Context
 import com.amazonaws.services.sqs.model.SendMessageResult
 import com.gu.salesforce.messageHandler.APIGatewayResponse._
-import com.sforce.soap._2005._09.outbound._
-import play.api.libs.json.{ JsValue, Json }
+import com.gu.salesforce.messageHandler.SOAPNotificationsParser.parseMessage
+import salesforce.soap.ContactNotification
+import play.api.libs.json.{JsValue, Json}
 
-import java.io.{ ByteArrayInputStream, InputStream, OutputStream }
-import javax.xml.bind.JAXBContext
-import javax.xml.soap.MessageFactory
-import scala.collection.JavaConverters._
+import java.io.{InputStream, OutputStream}
 import scala.concurrent.ExecutionContext.Implicits.global
 import scala.concurrent.duration.Duration
-import scala.concurrent.{ Await, Future }
-import scala.util.{ Failure, Try }
+import scala.concurrent.{Await, Future}
+import scala.util.{Failure, Try}
 
 trait RealDependencies {
   val queueClient = SqsClient
@@ -24,21 +22,6 @@ trait MessageHandler extends Logging {
 
   val queueName = s"salesforce-outbound-messages-${Config.stage}"
 
-  def parseMessage(requestBody: String) = {
-    val is = new ByteArrayInputStream(requestBody.getBytes)
-    val messageFactory = MessageFactory.newInstance()
-    val soapMessage = messageFactory.createMessage(null, is)
-    val body = soapMessage.getSOAPBody
-    val jc = JAXBContext.newInstance(classOf[Notifications])
-    val unmarshaller = jc.createUnmarshaller()
-    val je = unmarshaller.unmarshal(body.extractContentAsDocument(), classOf[Notifications])
-    je.getValue()
-  }
-
-  case class QueueMessage(contactId: String)
-
-  implicit val messageFormat = Json.format[QueueMessage]
-
   def credentialsAreValid(inputEvent: JsValue): Boolean = {
 
     val maybeApiClientId = (inputEvent \ "queryStringParameters" \ "apiClientId").asOpt[String]
@@ -56,13 +39,13 @@ trait MessageHandler extends Logging {
   }
 
   def sendToQueue(notification: ContactNotification): Future[Try[SendMessageResult]] = {
-    val queueMessage = QueueMessage(notification.getSObject.getId)
+    val queueMessage = QueueMessage(notification.sObject.Id.get)
     val queueMessageString = Json.prettyPrint(Json.toJson(queueMessage))
     queueClient.send(queueName, queueMessageString)
   }
 
-  def processNotifications(notifications: List[ContactNotification], outputStream: OutputStream) = {
-    val contactListStr = notifications.map(_.getSObject.getId).mkString(", ")
+  def processNotifications(notifications: Seq[ContactNotification], outputStream: OutputStream) = {
+    val contactListStr = notifications.flatMap(_.sObject.Id).mkString(", ")
     logger.info(s"contacts found in salesforce xml: [$contactListStr]")
     val FutureResponses = notifications.map(sendToQueue)
     val future = Future.sequence(FutureResponses).map { responses =>
@@ -91,8 +74,8 @@ trait MessageHandler extends Logging {
       logger.info("Authenticated request successfully...")
       val body = (inputEvent \ "body").as[String]
       val parsedMessage = parseMessage(body)
-      if (parsedMessage.getOrganizationId.startsWith(Config.salesforceOrganizationId)) {
-        processNotifications(asScalaBuffer(parsedMessage.getNotification).toList, outputStream)
+      if (parsedMessage.OrganizationId.startsWith(Config.salesforceOrganizationId)) {
+        processNotifications(parsedMessage.Notification, outputStream)
       } else {
         logger.info("Unexpected salesforce organization id in xml message")
         outputForAPIGateway(outputStream, unauthorized)

src/main/scala/com/gu/salesforce/messageHandler/QueueMessage.scala

@@ -0,0 +1,9 @@
+package com.gu.salesforce.messageHandler
+
+import play.api.libs.json.{Format, Json}
+
+case class QueueMessage(contactId: String)
+
+object QueueMessage {
+  implicit val messageFormat: Format[QueueMessage] = Json.format[QueueMessage]
+}

src/main/scala/com/gu/salesforce/messageHandler/SOAPNotificationsParser.scala

@@ -0,0 +1,26 @@
+package com.gu.salesforce.messageHandler
+
+import salesforce.soap.Notifications
+import scalaxb._
+import soapenvelope11.Envelope
+
+import scala.xml.{Elem, XML}
+
+object SOAPNotificationsParser {
+
+  /**
+   * Given a 'notifications' request from Salesforce (which comes embedded in a SOAP Envelope), extract the
+   * 'Notifications' object.
+   *
+   * https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_om_outboundmessaging_wsdl.htm
+   */
+  def parseMessage(soapRequestEnvelope: String): Notifications = {
+    val envelope: Envelope = fromXML[soapenvelope11.Envelope](XML.loadString(soapRequestEnvelope))
+
+    val notificationsXml = envelope.Body.any.collect({
+      case DataRecord(_, _, x: Elem) if x.label != "Fault" => x
+    }).head
+
+    fromXML[Notifications](notificationsXml)
+  }
+}

src/test/resources/soapNotificationsRequest.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+    <soapenv:Body>
+        <notifications xmlns="http://soap.sforce.com/2005/09/outbound">
+            <OrganizationId>someOrganizationId</OrganizationId>
+            <ActionId>SomeActionId</ActionId>
+            <SessionId xsi:nil="true"/>
+            <EnterpriseUrl>someEnterpriseUrl</EnterpriseUrl>
+            <PartnerUrl>somePartnerUrl</PartnerUrl>
+            <Notification>
+                <Id>notificationID</Id>
+                <sObject xsi:type="sf:Contact" xmlns:sf="urn:sobject.enterprise.soap.sforce.com">
+                    <sf:Id>aContactId</sf:Id>
+                </sObject>
+            </Notification>
+        </notifications>
+    </soapenv:Body>
+</soapenv:Envelope>

src/test/scala/com/gu/salesforce/messageHandler/SOAPNotificationsParserTest.scala

@@ -0,0 +1,18 @@
+package com.gu.salesforce.messageHandler
+
+import com.amazonaws.util.IOUtils
+import salesforce.soap.Notifications
+import org.specs2.mutable.Specification
+
+class SOAPNotificationsParserTest extends Specification {
+  def getTestString(fileName: String) = IOUtils.toString(getClass.getResourceAsStream(s"/$fileName"))
+
+  "Parser" should {
+    "parse a SOAP message" in {
+      val notifications: Notifications =
+        SOAPNotificationsParser.parseMessage(getTestString("soapNotificationsRequest.xml"))
+
+      notifications.Notification.head.sObject.Id must beSome("aContactId")
+    }
+  }
+}