Add ShareAccess property

app/build.gradle.kts

@@ -234,6 +234,7 @@ dependencies {
     testImplementation("com.natpryce:make-it-easy:${Versions.make_it_easy}")
     testImplementation("androidx.test:core:${Versions.androidx_test}")
     testImplementation("org.mockito:mockito-core:${Versions.mockito}")
+    testImplementation("org.ogce:xpp3:1.1.6")
 }
 
 apply(mapOf("plugin" to "com.google.gms.google-services"))

app/src/main/java/org/tasks/Tasks.kt

@@ -8,6 +8,7 @@ import android.util.Log
 import androidx.core.app.JobIntentService
 import androidx.hilt.work.HiltWorkerFactory
 import androidx.work.Configuration
+import at.bitfire.dav4jvm.PropertyRegistry
 import com.todoroo.astrid.service.Upgrader
 import dagger.Lazy
 import dagger.hilt.android.HiltAndroidApp
@@ -17,6 +18,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import org.tasks.billing.BillingClient
 import org.tasks.billing.Inventory
+import org.tasks.caldav.property.ShareAccess
 import org.tasks.files.FileHelper
 import org.tasks.injection.InjectingJobIntentService
 import org.tasks.jobs.WorkManager
@@ -90,6 +92,9 @@ class Tasks : Application(), Configuration.Provider {
         FileHelper.delete(context, preferences.cacheDirectory)
         billingClient.get().queryPurchases()
         appWidgetManager.get().reconfigureWidgets()
+        PropertyRegistry.register(listOf(
+                ShareAccess.Factory(),
+        ))
     }
 
     override fun getWorkManagerConfiguration(): Configuration = Configuration.Builder()

app/src/main/java/org/tasks/caldav/CaldavClient.kt

@@ -19,6 +19,7 @@ import okhttp3.HttpUrl
 import okhttp3.OkHttpClient
 import org.tasks.R
 import org.tasks.Strings.isNullOrEmpty
+import org.tasks.caldav.property.ShareAccess
 import org.tasks.data.CaldavAccount
 import org.tasks.ui.DisplayableException
 import org.xmlpull.v1.XmlPullParserException
@@ -121,7 +122,9 @@ open class CaldavClient(
                 SupportedCalendarComponentSet.NAME,
                 GetCTag.NAME,
                 CalendarColor.NAME,
-                SyncToken.NAME) { response: Response, relation: HrefRelation ->
+                SyncToken.NAME,
+                ShareAccess.NAME,
+        ) { response: Response, relation: HrefRelation ->
             if (relation == HrefRelation.MEMBER) {
                 responses.add(response)
             }

app/src/main/java/org/tasks/caldav/property/ShareAccess.kt

@@ -0,0 +1,47 @@
+package org.tasks.caldav.property
+
+import at.bitfire.dav4jvm.Property
+import at.bitfire.dav4jvm.PropertyFactory
+import at.bitfire.dav4jvm.XmlUtils
+import at.bitfire.dav4jvm.XmlUtils.propertyName
+import org.tasks.BuildConfig
+import org.xmlpull.v1.XmlPullParser
+
+data class ShareAccess(val access: Property.Name): Property {
+
+    companion object {
+        @JvmField
+        val NAME = Property.Name(XmlUtils.NS_WEBDAV, "share-access")
+
+        val SHARED_OWNER = Property.Name(XmlUtils.NS_WEBDAV, "shared-owner")
+        val READ_WRITE = Property.Name(XmlUtils.NS_WEBDAV, "read-write")
+        val NOT_SHARED = Property.Name(XmlUtils.NS_WEBDAV, "not-shared")
+        val READ = Property.Name(XmlUtils.NS_WEBDAV, "read")
+    }
+
+    override fun toString(): String {
+        return "ShareAccess(access=$access)"
+    }
+
+    class Factory : PropertyFactory {
+
+        override fun getName() = NAME
+
+        override fun create(parser: XmlPullParser): ShareAccess? {
+            // <!ELEMENT share-access #PCDATA>
+            var result: Property.Name? = null
+            val depth = parser.depth
+            var eventType = parser.eventType
+            while (!(eventType == XmlPullParser.END_TAG && parser.depth == depth)) {
+                if (eventType == XmlPullParser.START_TAG && parser.depth == depth + 1) {
+                    when (val name = parser.propertyName()) {
+                        SHARED_OWNER, READ_WRITE, NOT_SHARED, READ -> result = name
+                    }
+                }
+                eventType = parser.next()
+            }
+            if (BuildConfig.DEBUG && parser.depth != depth) { error("Assertion failed") }
+            return result?.let { ShareAccess(it) }
+        }
+    }
+}

app/src/test/java/org/tasks/caldav/property/PropertyUtils.kt

@@ -0,0 +1,31 @@
+package org.tasks.caldav.property
+
+import at.bitfire.dav4jvm.Property
+import at.bitfire.dav4jvm.XmlUtils
+import java.io.StringReader
+
+object PropertyUtils {
+    fun <T: Property> String.toProperty(): T =
+            toProperties()
+                    .apply { if (this.size != 1) throw IllegalStateException("${this.size} items") }
+                    .first()
+                    .let {
+                        @Suppress("UNCHECKED_CAST")
+                        it as T
+                    }
+
+    fun String.toProperties(): List<Property> =
+            XmlUtils.newPullParser()
+                    .apply {
+                        setInput(
+                                StringReader("""
+                                    <test xmlns:d="DAV:">
+                                        ${this@toProperties}
+                                    </test>
+                                    """.trimIndent()
+                                )
+                        )
+                        nextTag()
+                    }
+                    .let { Property.parse(it) }
+}

app/src/test/java/org/tasks/caldav/property/ShareAccessTest.kt

@@ -0,0 +1,26 @@
+package org.tasks.caldav.property
+
+import at.bitfire.dav4jvm.PropertyRegistry
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.tasks.caldav.property.PropertyUtils.toProperty
+import org.tasks.caldav.property.ShareAccess.Companion.SHARED_OWNER
+
+class ShareAccessTest {
+    @Before
+    fun setUp() {
+        PropertyRegistry.register(ShareAccess.Factory())
+    }
+
+    @Test
+    fun parseShareAccess() {
+        val access: ShareAccess = """
+            <d:share-access>
+                    <d:shared-owner />
+            </d:share-access>
+        """.toProperty()
+
+        assertEquals(ShareAccess(SHARED_OWNER), access)
+    }
+}