Add Topic property

src/main/kotlin/at/bitfire/dav4jvm/PropertyRegistry.kt

@@ -25,6 +25,7 @@ import at.bitfire.dav4jvm.property.carddav.AddressbookHomeSet
 import at.bitfire.dav4jvm.property.carddav.SupportedAddressData
 import at.bitfire.dav4jvm.property.push.PushSubscribe
 import at.bitfire.dav4jvm.property.push.PushTransports
+import at.bitfire.dav4jvm.property.push.Topic
 import at.bitfire.dav4jvm.property.webdav.AddMember
 import at.bitfire.dav4jvm.property.webdav.CreationDate
 import at.bitfire.dav4jvm.property.webdav.CurrentUserPrincipal
@@ -92,7 +93,8 @@ object PropertyRegistry {
             SupportedCalendarComponentSet.Factory,
             SupportedCalendarData.Factory,
             SupportedReportSet.Factory,
-            SyncToken.Factory
+            SyncToken.Factory,
+            Topic.Factory
         ))
     }
 

src/main/kotlin/at/bitfire/dav4jvm/property/push/Topic.kt

@@ -0,0 +1,35 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package at.bitfire.dav4jvm.property.push
+
+import at.bitfire.dav4jvm.Property
+import at.bitfire.dav4jvm.PropertyFactory
+import at.bitfire.dav4jvm.XmlUtils
+import org.xmlpull.v1.XmlPullParser
+
+class Topic private constructor(
+    val topic: String
+): Property {
+
+    companion object {
+
+        @JvmField
+        val NAME = Property.Name(NS_WEBDAV_PUSH, "topic")
+
+    }
+
+
+    object Factory: PropertyFactory {
+
+        override fun getName() = NAME
+
+        override fun create(parser: XmlPullParser) =
+            Topic(XmlUtils.requireReadText(parser))
+
+    }
+
+}

src/test/kotlin/at/bitfire/dav4jvm/property/WebPushTest.kt

@@ -4,6 +4,7 @@ import at.bitfire.dav4jvm.Property
 import at.bitfire.dav4jvm.property.push.NS_WEBDAV_PUSH
 import at.bitfire.dav4jvm.property.push.PushSubscribe
 import at.bitfire.dav4jvm.property.push.PushTransports
+import at.bitfire.dav4jvm.property.push.Topic
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertTrue
 import org.junit.Test
@@ -28,18 +29,22 @@ class WebPushTest: PropertyTest() {
     }
 
     @Test
-    fun testPushTransports() {
+    fun testServiceDetection() {
         val results = parseProperty(
                 "<push-transports xmlns=\"DAV:Push\">" +
                 "  <transport><something><else/></something></transport>" +
                 "  <transport><web-push/></transport>" +
-                "</push-transports>")
+                "</push-transports>" +
+                "<topic xmlns=\"DAV:Push\">SomeTopic</topic>")
         val result = results.first() as PushTransports
+
         assertEquals(setOf(
             Property.Name(NS_WEBDAV_PUSH, "something"),
             PushTransports.WEB_PUSH
         ), result.transports)
         assertTrue(result.hasWebPush())
+
+        assertEquals("SomeTopic", (results[1] as Topic).topic)
     }
 
 }