libeufin

commit e492d02140c9a35cd9ec551a5d8619831989fe47
parent f50906d1f48af0c5a5b190d06578103eaebdbe4d
Author: Marcello Stanisci <stanisci.m@gmail.com>
Date:   Fri, 11 Oct 2019 13:27:53 +0200

introduce helper downcast function

Diffstat:
M
sandbox/src/main/kotlin/Main.kt
 | 
44
++++++++++++++++++++++++++++++++++++++++++++
M
sandbox/src/main/kotlin/XML.kt
 | 
4
++--
M
sandbox/src/test/kotlin/DomToJaxbTest.kt
 | 
3
++-

3 files changed, 48 insertions(+), 3 deletions(-)
diff --git a/sandbox/src/main/kotlin/Main.kt b/sandbox/src/main/kotlin/Main.kt
@@ -39,13 +39,46 @@ import io.ktor.server.netty.Netty
 import org.jetbrains.exposed.sql.transactions.transaction
 import org.slf4j.LoggerFactory
 import org.w3c.dom.Document
+import org.w3c.dom.Element
 import tech.libeufin.messages.ebics.hev.HEVResponseDataType
+import tech.libeufin.messages.ebics.keyrequest.EbicsUnsecuredRequest
+import tech.libeufin.messages.ebics.keyrequest.UnsecuredReqOrderDetailsType
 import java.text.DateFormat
 import javax.xml.bind.JAXBElement
 
 val logger = LoggerFactory.getLogger("tech.libeufin.sandbox")
 val xmlProcess = XML()
 
+/**
+ * Sometimes, JAXB is not able to figure out to which type
+ * a certain XML node should be bound to.  This happens when
+ * one element name can have multiple definitions therefore
+ * JAXB renders it as a abstract class.  In that case, the
+ * object factory must be instructed about the subtype to create,
+ * and this is done via injecting the xsi:type attribute to the
+ * "overloaded" XML element.
+ *
+ * Alternative methods of addressing this?
+ *
+ * @param document the XML Document to modify
+ * @param node the name of the overloaded element (ideally this
+ * parameter should be a XPATH address)
+ * @param type the type to downcast @a node to
+ * @return the modified document
+ */
+fun downcastXml(document: Document, node: String, type: String) : Document {
+
+    val x: Element = document.getElementsByTagName("OrderDetails")?.item(0) as Element
+
+    x.setAttributeNS(
+        "http://www.w3.org/2001/XMLSchema-instance",
+        "type",
+        type
+    )
+
+    return document
+}
+
 private suspend fun ApplicationCall.adminCustomers() {
     val body = try {
         receive<CustomerRequest>()
@@ -170,6 +203,17 @@ private suspend fun ApplicationCall.ebicsweb() {
 
             /* Manage request.  */
 
+            val bodyJaxb = xmlProcess.convertDomToJaxb<EbicsUnsecuredRequest>(
+                "tech.libeufin.messages.ebics.keyrequest",
+                downcastXml(
+                    bodyDocument,
+                    "OrderDetails",
+                    "UnsecuredReqOrderDetailsType"
+                )
+            )
+
+            logger.info("Serving a ${bodyJaxb.header.static.orderDetails.orderType} request")
+
             respond(
                 HttpStatusCode.NotImplemented,
                 SandboxError("Not implemented")
diff --git a/sandbox/src/main/kotlin/XML.kt b/sandbox/src/main/kotlin/XML.kt
@@ -176,13 +176,13 @@ class XML {
      * @param document the document to convert into JAXB.
      * @return the JAXB object reflecting the original XML document.
      */
-    fun convertDomToJaxb(packageName: String, document: Document): Any {
+    fun <T>convertDomToJaxb(packageName: String, document: Document) : T {
 
         val jc = JAXBContext.newInstance(packageName)
 
         /* Marshalling the object into the document.  */
         val m = jc.createUnmarshaller()
-        return m.unmarshal(document) // document "went" into Jaxb
+        return m.unmarshal(document) as T // document "went" into Jaxb
     }
 
     /**
diff --git a/sandbox/src/test/kotlin/DomToJaxbTest.kt b/sandbox/src/test/kotlin/DomToJaxbTest.kt
@@ -2,6 +2,7 @@ package tech.libeufin.sandbox
 
 import org.junit.Test
 import org.w3c.dom.Element
+import tech.libeufin.messages.ebics.keyrequest.EbicsUnsecuredRequest
 import tech.libeufin.messages.ebics.keyrequest.OrderDetailsType
 import tech.libeufin.messages.ebics.keyrequest.UnsecuredReqOrderDetailsType
 
@@ -22,7 +23,7 @@ class DomToJaxbTest {
             "UnsecuredReqOrderDetailsType"
         )
 
-        processor.convertDomToJaxb(
+        processor.convertDomToJaxb<EbicsUnsecuredRequest>(
             "tech.libeufin.messages.ebics.keyrequest",
             iniDom)
     }