import 'dart:convert'; import 'package:aves/model/entry.dart'; import 'package:aves/model/metadata/enums.dart'; import 'package:aves/ref/iptc.dart'; import 'package:aves/services/common/services.dart'; import 'package:aves/services/metadata/xmp.dart'; import 'package:aves/utils/xmp_utils.dart'; import 'package:flutter/foundation.dart'; import 'package:package_info_plus/package_info_plus.dart'; import 'package:xml/xml.dart'; extension ExtraAvesEntryMetadataEdition on AvesEntry { // write: // - IPTC / keywords, if IPTC exists // - XMP / dc:subject Future> editTags(Set tags) async { final Map metadata = {}; final dataTypes = await setMetadataDateIfMissing(); if (canEditIptc) { final iptc = await metadataFetchService.getIptc(this); if (iptc != null) { editTagsIptc(iptc, tags); metadata[MetadataType.iptc] = iptc; } } if (canEditXmp) { metadata[MetadataType.xmp] = await _editXmp((descriptions) => editTagsXmp(descriptions, tags)); } final newFields = await metadataEditService.editMetadata(this, metadata); if (newFields.isNotEmpty) { dataTypes.add(EntryDataType.catalog); } return dataTypes; } // write: // - XMP / xmp:Rating // update: // - XMP / MicrosoftPhoto:Rating // ignore (Windows tags, not part of Exif 2.32 spec): // - Exif / Rating // - Exif / RatingPercent Future> editRating(int? rating) async { final Map metadata = {}; final dataTypes = await setMetadataDateIfMissing(); if (canEditXmp) { metadata[MetadataType.xmp] = await _editXmp((descriptions) => editRatingXmp(descriptions, rating)); } final newFields = await metadataEditService.editMetadata(this, metadata); if (newFields.isNotEmpty) { dataTypes.add(EntryDataType.catalog); } return dataTypes; } @visibleForTesting static void editTagsIptc(List> iptc, Set tags) { iptc.removeWhere((v) => v['record'] == IPTC.applicationRecord && v['tag'] == IPTC.keywordsTag); iptc.add({ 'record': IPTC.applicationRecord, 'tag': IPTC.keywordsTag, 'values': tags.map((v) => utf8.encode(v)).toList(), }); } @visibleForTesting static void editTagsXmp(List descriptions, Set tags) { XMP.setStringBag( descriptions, XMP.dcSubject, tags, namespace: Namespaces.dc, strat: XmpEditStrategy.always, ); } @visibleForTesting static void editRatingXmp(List descriptions, int? rating) { XMP.setAttribute( descriptions, XMP.xmpRating, (rating ?? 0) == 0 ? null : '$rating', namespace: Namespaces.xmp, strat: XmpEditStrategy.always, ); XMP.setAttribute( descriptions, XMP.msPhotoRating, XMP.toMsPhotoRating(rating), namespace: Namespaces.microsoftPhoto, strat: XmpEditStrategy.updateIfPresent, ); } // convenience Future> _editXmp(void Function(List descriptions) apply) async { final xmp = await metadataFetchService.getXmp(this); final xmpString = xmp?.xmpString; final extendedXmpString = xmp?.extendedXmpString; final editedXmpString = await XMP.edit( xmpString, () => PackageInfo.fromPlatform().then((v) => 'Aves v${v.version}'), apply, ); final editedXmp = AvesXmp(xmpString: editedXmpString, extendedXmpString: extendedXmpString); return { 'xmp': editedXmp.xmpString, 'extendedXmp': editedXmp.extendedXmpString, }; } }