prepare for multiple apps
This commit is contained in:
Fabian Freund
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/*
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* Copyright (c) 2024-2026 Fabian Freund.
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*
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* This file is part of WebLibre
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* (see https://weblibre.eu).
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import 'package:collection/collection.dart';
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import 'package:nullability/nullability.dart';
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import 'package:rss_dart/dart_rss.dart';
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import 'package:rss_dart/domain/rss1_feed.dart';
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import 'package:weblibre/features/web_feed/data/database/definitions.drift.dart';
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import 'package:weblibre/features/web_feed/data/models/feed_article.dart';
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import 'package:weblibre/features/web_feed/data/models/feed_author.dart';
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import 'package:weblibre/features/web_feed/data/models/feed_link.dart';
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import 'package:weblibre/features/web_feed/extensions/atom.dart';
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import 'package:weblibre/features/web_feed/extensions/rss.dart';
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class FeedParser {
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final Uri url;
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late Object _feed;
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FeedParser._(this.url, this._feed);
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factory FeedParser.parse({required Uri url, required String xmlString}) {
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final rssVersion = WebFeed.detectRssVersion(xmlString);
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final feed = switch (rssVersion) {
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RssVersion.rss1 => Rss1Feed.parse(xmlString),
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RssVersion.rss2 => RssFeed.parse(xmlString),
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RssVersion.atom => AtomFeed.parse(xmlString),
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RssVersion.unknown => throw Error.safeToString(
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'Invalid XML String? We cannot detect RSS/Atom version.',
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),
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};
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return FeedParser._(url, feed);
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}
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FeedData readGeneralData() {
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switch (_feed) {
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case final Rss1Feed feed:
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return FeedData(
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url: url,
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title: feed.title.whenNotEmpty ?? feed.dc?.title,
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description: feed.description.whenNotEmpty ?? feed.dc?.description,
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siteLink: feed.link.mapNotNull(Uri.tryParse),
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authors: feed.dc?.creator.whenNotEmpty.mapNotNull(
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(creator) => [FeedAuthor(name: creator)],
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),
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tags: feed.dc?.toFeedCategories(),
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);
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case final RssFeed feed:
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final categories = feed.categories.toFeedCategories();
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return FeedData(
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url: url,
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title: feed.title.whenNotEmpty ?? feed.dc?.title,
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description: feed.description.whenNotEmpty ?? feed.dc?.description,
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siteLink: feed.link.mapNotNull(Uri.tryParse),
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authors: (feed.author.whenNotEmpty ?? feed.dc?.creator.whenNotEmpty)
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.mapNotNull((creator) => [FeedAuthor(name: creator)]),
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tags: categories.isNotEmpty
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? categories
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: feed.dc?.toFeedCategories(),
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);
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case final AtomFeed feed:
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final authors = feed.authors.toFeedAuthors();
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final tags = feed.categories.toFeedCategories();
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return FeedData(
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url: url,
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title: feed.title.whenNotEmpty,
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icon: feed.icon.mapNotNull(Uri.tryParse),
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siteLink: feed.links
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.toFeedLinks()
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.getRelation(FeedLinkRelation.alternate)
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?.uri,
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description: feed.subtitle.whenNotEmpty,
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authors: authors.isNotEmpty ? authors : null,
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tags: tags,
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);
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default:
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throw Exception(
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'Unknown feed type in readGeneralData: ${_feed.runtimeType}',
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);
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}
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}
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List<FeedArticle> readArticles() {
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final fetchDate = DateTime.now();
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switch (_feed) {
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case final Rss1Feed feed:
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return feed.items.mapIndexed((i, item) {
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final title = item.title.whenNotEmpty ?? item.dc?.title.whenNotEmpty;
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final itemId = item.dc?.identifier.whenNotEmpty ?? title;
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final uniqueId =
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'${item.link.whenNotEmpty ?? feed.link.whenNotEmpty ?? url}#$itemId';
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final date = SafeParseDateTime.safeParse(item.dc?.date);
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final link = item.link.mapNotNull(Uri.tryParse);
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return FeedArticle(
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id: uniqueId,
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feedId: url,
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title: title,
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fetched: fetchDate,
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created: date,
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authors: item.dc?.creator.whenNotEmpty.mapNotNull(
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(creator) => [FeedAuthor(name: creator)],
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),
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summaryHtml:
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item.description.whenNotEmpty ??
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item.dc?.description.whenNotEmpty,
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links: link.mapNotNull(
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(link) => [
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FeedLink(uri: link, relation: FeedLinkRelation.alternate),
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],
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),
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tags: item.dc?.toFeedCategories(),
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contentHtml: item.content?.value.whenNotEmpty,
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);
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}).toList();
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case final RssFeed feed:
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return feed.items.mapIndexed((i, item) {
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final title = item.title.whenNotEmpty ?? item.dc?.title.whenNotEmpty;
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final itemId =
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item.guid.whenNotEmpty ??
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item.dc?.identifier.whenNotEmpty ??
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title;
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final uniqueId =
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'${item.link.whenNotEmpty ?? feed.link.whenNotEmpty ?? url}#$itemId';
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final date = SafeParseDateTime.safeParse(
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item.pubDate.whenNotEmpty ?? item.dc?.date,
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);
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final link = item.link.mapNotNull(Uri.tryParse);
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final author =
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item.author.whenNotEmpty ?? item.dc?.creator.whenNotEmpty;
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final categories = item.categories.toFeedCategories();
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return FeedArticle(
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id: uniqueId,
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feedId: url,
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title: title,
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fetched: fetchDate,
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created: date,
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authors: author.mapNotNull(
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(creator) => [FeedAuthor(name: creator)],
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),
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summaryHtml:
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item.description.whenNotEmpty ??
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item.dc?.description.whenNotEmpty,
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links: link.mapNotNull(
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(link) => [
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FeedLink(uri: link, relation: FeedLinkRelation.alternate),
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],
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),
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tags: categories.isNotEmpty
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? categories
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: item.dc?.toFeedCategories(),
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contentHtml: item.content?.value.whenNotEmpty,
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);
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}).toList();
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case final AtomFeed feed:
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final feedLink = feed.links.toFeedLinks().getRelation(
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FeedLinkRelation.self,
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);
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return feed.items.mapIndexed((i, item) {
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final authors = item.authors.toFeedAuthors();
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final tags = item.categories.toFeedCategories();
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final itemLinks = item.links.toFeedLinks();
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final articleLink = itemLinks.getRelation(FeedLinkRelation.alternate);
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final itemId = item.id.whenNotEmpty ?? item.title;
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final uniqueId =
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'${articleLink?.uri ?? feedLink?.uri ?? url}#$itemId';
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final published = SafeParseDateTime.safeParse(item.published);
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final updated = SafeParseDateTime.safeParse(item.updated);
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return FeedArticle(
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id: uniqueId,
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feedId: url,
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title: item.title.whenNotEmpty,
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summaryHtml: item.summary.whenNotEmpty,
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links: itemLinks,
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authors: authors.isNotEmpty ? authors : null,
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tags: tags,
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fetched: fetchDate,
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created: published,
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updated: updated,
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contentHtml: item.content.whenNotEmpty,
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);
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}).toList();
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default:
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throw Exception(
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'Unknown feed type in readArticles: ${_feed.runtimeType}',
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);
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}
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}
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}
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