Don't upload event when calendar is read only (#587)

* Make readOnly a LocalCollection property

* Move readOnly detection to SyncManager

* Add readOnly state access to LocalCalendar

* Add not implemented error to readOnly state access of LocalJtxCollection

* Handle read-only state of calendar at dirty events upload

* Handle read-only state of calendar at processing of locally deleted events

* Remove todo and update kdoc

* Fix indenting

* Add read-only prop to LocalTestCollection

* Add read-only state access to LocalTaskList

* LocalTestCollection: don't set read-only

* Update ical4android (for new KDoc)

* Make LocalCollection readOnly-API read only and take value from content provider during populate()

* SyncManager: use readOnly direct from localCollection

* Lift resetDeleted up to LocalResource

* Override and use resetDeleted for LocalEvent

* Add resetDeleted to LocalJtxICalObject

* Add resetDeleted to LocalTask

* Add resetDeleted to LocalTask

* Add resetDeleted to LocalTestResource

* Provide default access level

---------

Co-authored-by: Ricki Hirner <hirner@bitfire.at>

app/src/androidTestOse/kotlin/at/bitfire/davdroid/syncadapter/LocalTestCollection.kt

@@ -16,6 +16,9 @@ class LocalTestCollection: LocalCollection<LocalTestResource> {
 
     val entries = mutableListOf<LocalTestResource>()
 
+    override val readOnly: Boolean
+        get() = throw NotImplementedError()
+
     override fun findDeleted() = entries.filter { it.deleted }
     override fun findDirty() = entries.filter { it.dirty }
 

app/src/androidTestOse/kotlin/at/bitfire/davdroid/syncadapter/LocalTestResource.kt

@@ -34,5 +34,6 @@ class LocalTestResource: LocalResource<Any> {
     override fun add() = throw NotImplementedError()
     override fun update(data: Any) = throw NotImplementedError()
     override fun delete() = throw NotImplementedError()
+    override fun resetDeleted() = throw NotImplementedError()
 
 }

app/src/main/kotlin/at/bitfire/davdroid/resource/LocalAddress.kt

@@ -6,8 +6,4 @@ package at.bitfire.davdroid.resource
 
 import at.bitfire.vcard4android.Contact
 
-interface LocalAddress: LocalResource<Contact> {
-
-    fun resetDeleted()
-
-}
+interface LocalAddress: LocalResource<Contact>

app/src/main/kotlin/at/bitfire/davdroid/resource/LocalCalendar.kt

@@ -91,6 +91,10 @@ class LocalCalendar private constructor(
     override val title: String
         get() = displayName ?: id.toString()
 
+    private var accessLevel: Int = Calendars.CAL_ACCESS_OWNER   // assume full access if not specified
+    override val readOnly
+        get() = accessLevel <= Calendars.CAL_ACCESS_READ
+
     override var lastSyncState: SyncState?
         get() = provider.query(calendarSyncURI(), arrayOf(COLUMN_SYNC_STATE), null, null, null)?.use { cursor ->
                     if (cursor.moveToNext())
@@ -105,6 +109,11 @@ class LocalCalendar private constructor(
         }
 
 
+    override fun populate(info: ContentValues) {
+        super.populate(info)
+        accessLevel = info.getAsInteger(Calendars.CALENDAR_ACCESS_LEVEL) ?: Calendars.CAL_ACCESS_OWNER
+    }
+
     fun update(info: Collection, updateColor: Boolean) =
             update(valuesFromCollectionInfo(info, updateColor))
 

app/src/main/kotlin/at/bitfire/davdroid/resource/LocalCollection.kt

@@ -17,6 +17,12 @@ interface LocalCollection<out T: LocalResource<*>> {
 
     var lastSyncState: SyncState?
 
+    /**
+     * Whether the collection should be treated as read-only on sync.
+     * Stops uploading dirty events (Server side changes are still downloaded).
+     */
+    val readOnly: Boolean
+
     /**
      * Finds local resources of this collection which have been marked as *deleted* by the user
      * or an app acting on their behalf.

app/src/main/kotlin/at/bitfire/davdroid/resource/LocalEvent.kt

@@ -21,7 +21,6 @@ import at.bitfire.ical4android.Ical4Android
 import at.bitfire.ical4android.util.MiscUtils.asSyncAdapter
 import net.fortuna.ical4j.model.property.ProdId
 import java.util.UUID
-
 class LocalEvent: AndroidEvent, LocalResource<Event> {
 
     companion object {
@@ -51,6 +50,7 @@ class LocalEvent: AndroidEvent, LocalResource<Event> {
             )
         }
 
+
         /**
          * Finds the amount of direct instances this event has (without exceptions); used by [numInstances]
          * to find the number of instances of exceptions.
@@ -256,6 +256,10 @@ class LocalEvent: AndroidEvent, LocalResource<Event> {
         this.flags = flags
     }
 
+    override fun resetDeleted() {
+        val values = ContentValues(1).apply { put(Events.DELETED, 0) }
+        calendar.provider.update(eventSyncURI(), values, null, null)
+    }
 
     object Factory: AndroidEventFactory<LocalEvent> {
         override fun fromProvider(calendar: AndroidCalendar<*>, values: ContentValues) =
@@ -263,3 +267,4 @@ class LocalEvent: AndroidEvent, LocalResource<Event> {
     }
 
 }
+

app/src/main/kotlin/at/bitfire/davdroid/resource/LocalJtxCollection.kt

@@ -50,6 +50,9 @@ class LocalJtxCollection(account: Account, client: ContentProviderClient, id: Lo
             }
     }
 
+    override val readOnly: Boolean
+        get() = throw NotImplementedError()
+
     override val tag: String
         get() =  "jtx-${account.name}-$id"
     override val title: String

app/src/main/kotlin/at/bitfire/davdroid/resource/LocalJtxICalObject.kt

@@ -47,4 +47,9 @@ class LocalJtxICalObject(
         }
 
     }
+
+    override fun resetDeleted() {
+        throw NotImplementedError()
+    }
+
 }

app/src/main/kotlin/at/bitfire/davdroid/resource/LocalResource.kt

@@ -90,4 +90,9 @@ interface LocalResource<in TData: Any> {
      */
     fun delete(): Int
 
+    /**
+     * Undoes deletion of the data object from the content provider.
+     */
+    fun resetDeleted()
+
 }

app/src/main/kotlin/at/bitfire/davdroid/resource/LocalTask.kt

@@ -104,6 +104,10 @@ class LocalTask: DmfsTask, LocalResource<Task> {
         this.flags = flags
     }
 
+    override fun resetDeleted() {
+        throw NotImplementedError()
+    }
+
 
     object Factory: DmfsTaskFactory<LocalTask> {
         override fun fromProvider(taskList: DmfsTaskList<*>, values: ContentValues) =

app/src/main/kotlin/at/bitfire/davdroid/resource/LocalTaskList.kt

@@ -68,6 +68,12 @@ class LocalTaskList private constructor(
 
     }
 
+    private var accessLevel: Int = TaskListColumns.ACCESS_LEVEL_UNDEFINED
+    override val readOnly
+        get() =
+            accessLevel != TaskListColumns.ACCESS_LEVEL_UNDEFINED &&
+            accessLevel <= TaskListColumns.ACCESS_LEVEL_READ
+
     override val tag: String
         get() = "tasks-${account.name}-$id"
 
@@ -96,8 +102,13 @@ class LocalTaskList private constructor(
         }
 
 
+    override fun populate(values: ContentValues) {
+        super.populate(values)
+        accessLevel = values.getAsInteger(TaskListColumns.ACCESS_LEVEL)
+    }
+
     fun update(info: Collection, updateColor: Boolean) =
-            update(valuesFromCollectionInfo(info, updateColor))
+        update(valuesFromCollectionInfo(info, updateColor))
 
 
     override fun findDeleted() = queryTasks(Tasks._DELETED, null)

app/src/main/kotlin/at/bitfire/davdroid/syncadapter/CalendarSyncManager.kt

@@ -73,29 +73,74 @@ class CalendarSyncManager(
     }
 
     override fun queryCapabilities(): SyncState? =
-            remoteExceptionContext {
-                var syncState: SyncState? = null
-                it.propfind(0, MaxResourceSize.NAME, SupportedReportSet.NAME, GetCTag.NAME, SyncToken.NAME) { response, relation ->
-                    if (relation == Response.HrefRelation.SELF) {
-                        response[MaxResourceSize::class.java]?.maxSize?.let { maxSize ->
-                            Logger.log.info("Calendar accepts events up to ${FileUtils.byteCountToDisplaySize(maxSize)}")
-                        }
-
-                        response[SupportedReportSet::class.java]?.let { supported ->
-                            hasCollectionSync = supported.reports.contains(SupportedReportSet.SYNC_COLLECTION)
-                        }
-                        syncState = syncState(response)
+        remoteExceptionContext {
+            var syncState: SyncState? = null
+            it.propfind(0, MaxResourceSize.NAME, SupportedReportSet.NAME, GetCTag.NAME, SyncToken.NAME) { response, relation ->
+                if (relation == Response.HrefRelation.SELF) {
+                    response[MaxResourceSize::class.java]?.maxSize?.let { maxSize ->
+                        Logger.log.info("Calendar accepts events up to ${FileUtils.byteCountToDisplaySize(maxSize)}")
                     }
-                }
 
-                Logger.log.info("Calendar supports Collection Sync: $hasCollectionSync")
-                syncState
+                    response[SupportedReportSet::class.java]?.let { supported ->
+                        hasCollectionSync = supported.reports.contains(SupportedReportSet.SYNC_COLLECTION)
+                    }
+                    syncState = syncState(response)
+                }
             }
 
-    override fun syncAlgorithm() = if (accountSettings.getTimeRangePastDays() != null || !hasCollectionSync)
-                SyncAlgorithm.PROPFIND_REPORT
-            else
-                SyncAlgorithm.COLLECTION_SYNC
+            Logger.log.info("Calendar supports Collection Sync: $hasCollectionSync")
+            syncState
+        }
+
+    override fun syncAlgorithm() =
+        if (accountSettings.getTimeRangePastDays() != null || !hasCollectionSync)
+            SyncAlgorithm.PROPFIND_REPORT
+        else
+            SyncAlgorithm.COLLECTION_SYNC
+
+    override fun processLocallyDeleted(): Boolean {
+        if (localCollection.readOnly) {
+            var modified = false
+            for (event in localCollection.findDeleted()) {
+                Logger.log.warning("Restoring locally deleted event (read-only calendar!)")
+                localExceptionContext(event) { it.resetDeleted() }
+                modified = true
+            }
+
+            // This is unfortunately ugly: When an event has been inserted to a read-only calendar
+            // it's not enough to force synchronization (by returning true),
+            // but we also need to make sure all events are downloaded again.
+            if (modified)
+                localCollection.lastSyncState = null
+
+            return modified
+        }
+        // mirror deletions to remote collection (DELETE)
+        return super.processLocallyDeleted()
+    }
+
+    override fun uploadDirty(): Boolean {
+        var modified = false
+        if (localCollection.readOnly) {
+            for (event in localCollection.findDirty()) {
+                Logger.log.warning("Resetting locally modified event to ETag=null (read-only calendar!)")
+                localExceptionContext(event) { it.clearDirty(null, null) }
+                modified = true
+            }
+
+            // This is unfortunately ugly: When an event has been inserted to a read-only calendar
+            // it's not enough to force synchronization (by returning true),
+            // but we also need to make sure all events are downloaded again.
+            if (modified)
+                localCollection.lastSyncState = null
+        }
+
+        // generate UID/file name for newly created events
+        val superModified = super.uploadDirty()
+
+        // return true when any operation returned true
+        return modified or superModified
+    }
 
     override fun generateUpload(resource: LocalEvent): RequestBody = localExceptionContext(resource) {
         val event = requireNotNull(resource.event)
@@ -143,8 +188,7 @@ class CalendarSyncManager(
         }
     }
 
-    override fun postProcess() {
-    }
+    override fun postProcess() {}
 
 
     // helpers
@@ -195,6 +239,6 @@ class CalendarSyncManager(
     }
 
     override fun notifyInvalidResourceTitle(): String =
-            context.getString(R.string.sync_invalid_event)
+        context.getString(R.string.sync_invalid_event)
 
 }

app/src/main/kotlin/at/bitfire/davdroid/syncadapter/ContactsSyncManager.kt

@@ -105,8 +105,6 @@ class ContactsSyncManager(
         infix fun <T> Set<T>.disjunct(other: Set<T>) = (this - other) union (other - this)
     }
 
-    private val readOnly = localAddressBook.readOnly
-
     private var hasVCard4 = false
     private var hasJCard = false
     private val groupStrategy = when (accountSettings.getGroupMethod()) {
@@ -177,7 +175,7 @@ class ContactsSyncManager(
             SyncAlgorithm.PROPFIND_REPORT
 
     override fun processLocallyDeleted() =
-            if (readOnly) {
+            if (localCollection.readOnly) {
                 var modified = false
                 for (group in localCollection.findDeletedGroups()) {
                     Logger.log.warning("Restoring locally deleted group (read-only address book!)")
@@ -205,7 +203,7 @@ class ContactsSyncManager(
     override fun uploadDirty(): Boolean {
         var modified = false
 
-        if (readOnly) {
+        if (localCollection.readOnly) {
             for (group in localCollection.findDirtyGroups()) {
                 Logger.log.warning("Resetting locally modified group to ETag=null (read-only address book!)")
                 localExceptionContext(group) { it.clearDirty(null, null) }

gradle/libs.versions.toml

@@ -28,7 +28,7 @@ androidx-work = "2.9.0"
 appIntro = "7.0.0-beta02"
 bitfire-cert4android = "f0964cb"
 bitfire-dav4jvm = "b30913f"
-bitfire-ical4android = "998f6b6"
+bitfire-ical4android = "31650d1"
 bitfire-vcard4android = "03ef99a"
 commons-collections = "4.4"
 commons-lang = "3.14.0"