Use the EXIF data provided by Nextcloud Photos

app/lib/api/entity_converter.dart

@@ -50,7 +50,7 @@ class ApiFavoriteConverter {
 
 class ApiFileConverter {
   static File fromApi(api.File file) {
-    final metadata = file.customProperties?["com.nkming.nc_photos:metadata"]
+    var metadata = file.customProperties?["com.nkming.nc_photos:metadata"]
         ?.run((obj) => Metadata.fromJson(
               jsonDecode(obj),
               upgraderV1: MetadataUpgraderV1(
@@ -66,6 +66,15 @@ class ApiFileConverter {
                 logFilePath: file.href,
               ),
             ));
+    if (file.metadataPhotosIfd0 != null) {
+      final ifd0_metadata = Metadata.fromPhotosIfd0(file.metadataPhotosIfd0!);
+      if (metadata == null) {
+        metadata = ifd0_metadata;
+      } else {
+        metadata = metadata.copyWith(exif: ifd0_metadata.exif);
+      }
+    }
+
     return File(
       path: _hrefToPath(file.href),
       contentLength: file.contentLength,

app/lib/entity/file.dart

@@ -185,6 +185,16 @@ class Metadata with EquatableMixin {
     );
   }
 
+  static Metadata fromPhotosIfd0(Map<String, String> metadataPhotosIfd0) {
+    return Metadata(
+      lastUpdated: null,
+      fileEtag: null,
+      imageWidth: null,
+      imageHeight: null,
+      exif: new Exif(metadataPhotosIfd0),
+    );
+  }
+
   @override
   String toString() => _$toString();
 

app/lib/entity/file/data_source.dart

@@ -55,6 +55,7 @@ class FileWebdavDataSource implements FileDataSource {
       trashbinFilename: 1,
       trashbinOriginalLocation: 1,
       trashbinDeletionTime: 1,
+      metadataPhotosIfd0: 1,
       customNamespaces: {
         "com.nkming.nc_photos": "app",
       },
@@ -275,6 +276,7 @@ class FileWebdavDataSource implements FileDataSource {
     trashbinFilename,
     trashbinOriginalLocation,
     trashbinDeletionTime,
+    metadataPhotosIfd0,
     Map<String, String>? customNamespaces,
     List<String>? customProperties,
   }) async {
@@ -302,6 +304,7 @@ class FileWebdavDataSource implements FileDataSource {
           trashbinFilename: trashbinFilename,
           trashbinOriginalLocation: trashbinOriginalLocation,
           trashbinDeletionTime: trashbinDeletionTime,
+          metadataPhotosIfd0: metadataPhotosIfd0,
           customNamespaces: customNamespaces,
           customProperties: customProperties,
         );

np_api/lib/src/entity/entity.dart

@@ -84,6 +84,7 @@ class File with EquatableMixin {
     this.trashbinFilename,
     this.trashbinOriginalLocation,
     this.trashbinDeletionTime,
+    this.metadataPhotosIfd0,
     this.customProperties,
   });
 
@@ -106,6 +107,7 @@ class File with EquatableMixin {
         trashbinFilename,
         trashbinOriginalLocation,
         trashbinDeletionTime,
+        metadataPhotosIfd0,
         customProperties,
       ];
 
@@ -123,6 +125,7 @@ class File with EquatableMixin {
   final String? trashbinFilename;
   final String? trashbinOriginalLocation;
   final DateTime? trashbinDeletionTime;
+  final Map<String, String>? metadataPhotosIfd0;
   final Map<String, String>? customProperties;
 }
 

np_api/lib/src/entity/file_parser.dart

@@ -33,6 +33,7 @@ class FileParser extends XmlResponseParser {
     String? trashbinFilename;
     String? trashbinOriginalLocation;
     DateTime? trashbinDeletionTime;
+    Map<String, String>? metadataPhotosIfd0;
     Map<String, String>? customProperties;
 
     for (final child in element.children.whereType<XmlElement>()) {
@@ -66,6 +67,7 @@ class FileParser extends XmlResponseParser {
         trashbinFilename = propParser.trashbinFilename;
         trashbinOriginalLocation = propParser.trashbinOriginalLocation;
         trashbinDeletionTime = propParser.trashbinDeletionTime;
+        metadataPhotosIfd0 = propParser.metadataPhotosIfd0;
         customProperties = propParser.customProperties;
       }
     }
@@ -85,6 +87,7 @@ class FileParser extends XmlResponseParser {
       trashbinFilename: trashbinFilename,
       trashbinOriginalLocation: trashbinOriginalLocation,
       trashbinDeletionTime: trashbinDeletionTime,
+      metadataPhotosIfd0: metadataPhotosIfd0,
       customProperties: customProperties,
     );
   }
@@ -140,6 +143,11 @@ class _PropParser {
           prefix: "http://nextcloud.org/ns", namespaces: namespaces)) {
         _trashbinDeletionTime = DateTime.fromMillisecondsSinceEpoch(
             int.parse(child.innerText) * 1000);
+      } else if (child.matchQualifiedName("metadata-photos-ifd0",
+          prefix: "http://nextcloud.org/ns", namespaces: namespaces)) {
+        for (final ifd0_child in child.children.whereType<XmlElement>()) {
+          (_metadataPhotosIfd0 ??= {})[ifd0_child.name.toString()] = ifd0_child.innerText;
+        }
       } else {
         final key = child.name.prefix == null
             ? child.localName
@@ -162,6 +170,7 @@ class _PropParser {
   String? get trashbinFilename => _trashbinFilename;
   String? get trashbinOriginalLocation => _trashbinOriginalLocation;
   DateTime? get trashbinDeletionTime => _trashbinDeletionTime;
+  Map<String, String>? get metadataPhotosIfd0 => _metadataPhotosIfd0;
   Map<String, String>? get customProperties => _customProperties;
 
   final Map<String, String> namespaces;
@@ -179,6 +188,7 @@ class _PropParser {
   String? _trashbinFilename;
   String? _trashbinOriginalLocation;
   DateTime? _trashbinDeletionTime;
+  Map<String, String>? _metadataPhotosIfd0;
   Map<String, String>? _customProperties;
 }
 

np_api/lib/src/files_api.dart

@@ -72,6 +72,7 @@ class ApiFiles {
     trashbinFilename,
     trashbinOriginalLocation,
     trashbinDeletionTime,
+    metadataPhotosIfd0,
     Map<String, String>? customNamespaces,
     List<String>? customProperties,
   }) async {
@@ -96,7 +97,8 @@ class ApiFiles {
           richWorkspace != null ||
           trashbinFilename != null ||
           trashbinOriginalLocation != null ||
-          trashbinDeletionTime != null);
+          trashbinDeletionTime != null ||
+          metadataPhotosIfd0 != null);
       if (!hasDavNs && !hasOcNs && !hasNcNs) {
         // no body
         return await _api.request("PROPFIND", path);
@@ -175,6 +177,9 @@ class ApiFiles {
             if (trashbinDeletionTime != null) {
               builder.element("nc:trashbin-deletion-time");
             }
+            if (metadataPhotosIfd0 != null) {
+              builder.element("nc:metadata-photos-ifd0");
+            }
             for (final p in customProperties ?? []) {
               builder.element(p);
             }