Thumbnails: Check <oc:has-preview> property

opencloudApp/src/main/java/eu/opencloud/android/presentation/files/filelist/FileListAdapter.kt

@@ -278,7 +278,7 @@ class FileListAdapter(
                 // Set file icon depending on its mimetype. Ask for thumbnail later.
                 fileIcon.setImageResource(MimetypeIconUtil.getFileTypeIconId(file.mimeType, file.fileName))
 
-                if (file.isImage) {
+                if (file.hasPreview || file.isImage) {
                     account?.let { acc ->
                         fileIcon.load(ThumbnailsRequester.getPreviewUriForFile(fileWithSyncInfo, acc),
                             ThumbnailsRequester.getContentAddressedImageLoader(acc)) {

opencloudComLibrary/src/main/java/eu/opencloud/android/lib/common/http/methods/webdav/DavUtils.kt

@@ -37,6 +37,7 @@ import at.bitfire.dav4jvm.property.OCPrivatelink
 import at.bitfire.dav4jvm.property.OCSize
 import at.bitfire.dav4jvm.property.ResourceType
 import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCChecksums
+import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCHasPreview
 import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCShareTypes
 
 object DavUtils {
@@ -55,6 +56,7 @@ object DavUtils {
             OCPrivatelink.NAME,
             OCShareTypes.NAME,
             OCChecksums.NAME,
+            OCHasPreview.NAME,
         )
 
     val quotaPropSet: Array<Property.Name>

opencloudComLibrary/src/main/java/eu/opencloud/android/lib/common/http/methods/webdav/properties/OCHasPreview.kt

@@ -0,0 +1,54 @@
+/* openCloud Android Library is available under MIT license
+ *   Copyright (C) 2026 OpenCloud GmbH.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ *   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ *   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ *   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ *   THE SOFTWARE.
+ */
+
+package eu.opencloud.android.lib.common.http.methods.webdav.properties
+
+import at.bitfire.dav4jvm.Property
+import at.bitfire.dav4jvm.PropertyFactory
+import at.bitfire.dav4jvm.XmlUtils
+import org.xmlpull.v1.XmlPullParser
+
+/**
+ * Parses `<oc:has-preview>` from a PROPFIND response: "1" when the server can render a thumbnail
+ * for this resource, "0" otherwise. Mirrors what the Web UI uses to decide whether to show a
+ * preview, so the file list can request thumbnails only where one actually exists.
+ *
+ * @author Markus Goetz
+ */
+data class OCHasPreview(val hasPreview: Boolean) : Property {
+    class Factory : PropertyFactory {
+        override fun getName() = NAME
+
+        override fun create(parser: XmlPullParser): OCHasPreview? {
+            XmlUtils.readText(parser)?.let {
+                return OCHasPreview(it == "1")
+            }
+            return null
+        }
+    }
+
+    companion object {
+        @JvmField
+        val NAME = Property.Name(XmlUtils.NS_OWNCLOUD, "has-preview")
+    }
+}

opencloudComLibrary/src/main/java/eu/opencloud/android/lib/resources/files/ReadRemoteFileOperation.kt

@@ -32,6 +32,7 @@ import eu.opencloud.android.lib.common.http.methods.webdav.DavConstants.DEPTH_0
 import eu.opencloud.android.lib.common.http.methods.webdav.DavUtils
 import eu.opencloud.android.lib.common.http.methods.webdav.PropfindMethod
 import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCChecksums
+import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCHasPreview
 import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCShareTypes
 import eu.opencloud.android.lib.common.network.WebdavUtils
 import eu.opencloud.android.lib.common.operations.RemoteOperation
@@ -67,6 +68,7 @@ class ReadRemoteFileOperation(
             }
             PropertyRegistry.register(OCShareTypes.Factory())
             PropertyRegistry.register(OCChecksums.Factory())
+            PropertyRegistry.register(OCHasPreview.Factory())
 
             val propFind = PropfindMethod(
                 url = getFinalWebDavUrl(),

opencloudComLibrary/src/main/java/eu/opencloud/android/lib/resources/files/ReadRemoteFolderOperation.kt

@@ -32,6 +32,7 @@ import eu.opencloud.android.lib.common.http.methods.webdav.DavConstants
 import eu.opencloud.android.lib.common.http.methods.webdav.DavUtils
 import eu.opencloud.android.lib.common.http.methods.webdav.PropfindMethod
 import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCChecksums
+import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCHasPreview
 import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCShareTypes
 import eu.opencloud.android.lib.common.network.WebdavUtils
 import eu.opencloud.android.lib.common.operations.RemoteOperation
@@ -62,6 +63,7 @@ class ReadRemoteFolderOperation(
         try {
             PropertyRegistry.register(OCShareTypes.Factory())
             PropertyRegistry.register(OCChecksums.Factory())
+            PropertyRegistry.register(OCHasPreview.Factory())
 
             val propfindMethod = PropfindMethod(
                 getFinalWebDavUrl(),

opencloudComLibrary/src/main/java/eu/opencloud/android/lib/resources/files/RemoteFile.kt

@@ -40,6 +40,7 @@ import at.bitfire.dav4jvm.property.OCPrivatelink
 import at.bitfire.dav4jvm.property.OCSize
 import eu.opencloud.android.lib.common.http.HttpConstants
 import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCChecksums
+import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCHasPreview
 import eu.opencloud.android.lib.common.http.methods.webdav.properties.OCShareTypes
 import eu.opencloud.android.lib.common.utils.isOneOf
 import eu.opencloud.android.lib.resources.shares.ShareType
@@ -76,6 +77,8 @@ data class RemoteFile(
     var sharedWithSharee: Boolean = false,
     /** Server-reported checksums as raw "ALGORITHM:value" strings (e.g. "SHA1:1c68ea…"). */
     var checksums: List<String> = emptyList(),
+    /** Whether the server can render a thumbnail for this file (from `<oc:has-preview>`). */
+    var hasPreview: Boolean = false,
 ) : Parcelable {
 
     // To do: Quotas not used. Use or remove them.
@@ -140,6 +143,9 @@ data class RemoteFile(
                     is OCChecksums -> {
                         remoteFile.checksums = property.checksums
                     }
+                    is OCHasPreview -> {
+                        remoteFile.hasPreview = property.hasPreview
+                    }
                     is OCShareTypes -> {
                         val list = property.shareTypes
                         for (i in list.indices) {