Accept utf BOM prefix in imported xml file

api-webapp/pom.xml

@@ -154,6 +154,11 @@
             <artifactId>commons-lang3</artifactId>
             <version>3.12.0</version>
         </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.13.0</version>
+        </dependency>
         <!-- auth -->
         <dependency>
             <groupId>org.pac4j</groupId>

api-webapp/src/main/kotlin/org/jeudego/pairgoth/server/ApiServlet.kt

@@ -1,6 +1,7 @@
 package org.jeudego.pairgoth.server
 
 import com.republicate.kson.Json
+import org.apache.commons.io.input.BOMInputStream
 import org.jeudego.pairgoth.api.ApiHandler
 import org.jeudego.pairgoth.api.PairingHandler
 import org.jeudego.pairgoth.api.PlayerHandler
@@ -17,6 +18,7 @@ import org.jeudego.pairgoth.util.toString
 import org.slf4j.LoggerFactory
 import org.w3c.dom.Element
 import java.io.IOException
+import java.io.InputStreamReader
 import java.util.*
 import java.util.concurrent.locks.ReadWriteLock
 import java.util.concurrent.locks.ReentrantReadWriteLock
@@ -194,7 +196,7 @@ class ApiServlet: HttpServlet() {
             // some API calls like opengotha import accept xml docs as body
             // CB TODO - limit to those calls
             try {
-                XmlUtils.parse(request.reader).let { payload: Element ->
+                XmlUtils.parse(InputStreamReader(BOMInputStream(request.inputStream))).let { payload: Element ->
                     request.setAttribute(ApiHandler.PAYLOAD_KEY, payload)
                     logger.info(blue("<<     (xml document)"))