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https://github.com/venera-app/venera.git
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fix #90: export comic as epub
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208
lib/utils/epub.dart
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208
lib/utils/epub.dart
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@@ -0,0 +1,208 @@
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import 'dart:isolate';
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import 'package:uuid/uuid.dart';
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import 'package:venera/foundation/app.dart';
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import 'package:venera/foundation/local.dart';
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import 'package:venera/utils/file_type.dart';
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import 'package:venera/utils/io.dart';
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import 'package:zip_flutter/zip_flutter.dart';
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class EpubData {
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final String title;
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final String author;
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final File cover;
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final Map<String, List<File>> chapters;
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const EpubData({
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required this.title,
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required this.author,
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required this.cover,
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required this.chapters,
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});
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}
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Future<File> createEpubComic(EpubData data, String cacheDir) async {
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final workingDir = Directory(FilePath.join(cacheDir, 'epub'));
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if (workingDir.existsSync()) {
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workingDir.deleteSync(recursive: true);
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}
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workingDir.createSync(recursive: true);
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// mimetype
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workingDir.joinFile('mimetype').writeAsStringSync('application/epub+zip');
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// META-INF
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Directory(FilePath.join(workingDir.path, 'META-INF')).createSync();
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File(FilePath.join(workingDir.path, 'META-INF', 'container.xml'))
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.writeAsStringSync('''
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<?xml version="1.0"?>
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<container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container">
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<rootfiles>
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<rootfile full-path="content.opf" media-type="application/oebps-package+xml"/>
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</rootfiles>
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</container>
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''');
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Directory(FilePath.join(workingDir.path, 'OEBPS')).createSync();
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// copy images, create html files
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final imageDir = Directory(FilePath.join(workingDir.path, 'OEBPS', 'images'));
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imageDir.createSync();
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final coverExt = data.cover.extension;
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final coverMime = FileType.fromExtension(coverExt).mime;
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imageDir
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.joinFile('cover.$coverExt')
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.writeAsBytesSync(data.cover.readAsBytesSync());
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int imgIndex = 0;
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int chapterIndex = 0;
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var manifestStrBuilder = StringBuffer();
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manifestStrBuilder.writeln(
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' <item id="cover_image" href="OEBPS/images/cover.$coverExt" media-type="$coverMime"/>');
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manifestStrBuilder.writeln(
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' <item id="toc" href="toc.ncx" media-type="application/x-dtbncx+xml"/>');
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for (final chapter in data.chapters.keys) {
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var images = <String>[];
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for (final image in data.chapters[chapter]!) {
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final ext = image.extension;
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imageDir
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.joinFile('img$imgIndex.$ext')
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.writeAsBytesSync(image.readAsBytesSync());
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images.add('images/img$imgIndex.$ext');
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var mime = FileType.fromExtension(ext).mime;
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manifestStrBuilder.writeln(
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' <item id="img$imgIndex" href="OEBPS/images/img$imgIndex$ext" media-type="$mime"/>');
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imgIndex++;
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}
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var html =
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File(FilePath.join(workingDir.path, 'OEBPS', '$chapterIndex.html'));
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html.writeAsStringSync('''
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>$chapter</title>
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<style type="text/css">
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img {
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max-width: 100%;
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height: auto;
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}
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body {
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margin: 0;
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padding: 0;
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}
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</style>
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</head>
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<body>
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<h1>$chapter</h1>
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<div>
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${images.map((e) => ' <img src="$e" alt="$e"/>').join('\n')}
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</div>
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</body>
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</html>
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''');
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manifestStrBuilder.writeln(
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' <item id="chapter$chapterIndex" href="OEBPS/$chapterIndex.html" media-type="application/xhtml+xml"/>');
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chapterIndex++;
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}
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// content.opf
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final contentOpf =
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File(FilePath.join(workingDir.path, 'content.opf'));
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final uuid = const Uuid().v4();
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var spineStrBuilder = StringBuffer();
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for (var i = 0; i < chapterIndex; i++) {
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var idRef = 'idref="chapter$i"';
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spineStrBuilder.writeln(' <itemref $idRef/>');
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}
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contentOpf.writeAsStringSync('''
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<?xml version="1.0" encoding="UTF-8"?>
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<package version="3.0"
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xmlns="http://www.idpf.org/2007/opf"
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xmlns:dc="http://purl.org/dc/elements/1.1/">
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<metadata>
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<dc:title>${data.title}</dc:title>
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<dc:creator>${data.author}</dc:creator>
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<dc:identifier id="book_id">urn:uuid:$uuid</dc:identifier>
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<meta name="cover" content="cover_image"/>
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</metadata>
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<manifest>
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${manifestStrBuilder.toString()}
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</manifest>
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<spine toc="toc">
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${spineStrBuilder.toString()}
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</spine>
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</package>
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''');
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// toc.ncx
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final tocNcx = File(FilePath.join(workingDir.path, 'toc.ncx'));
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var navMapStrBuilder = StringBuffer();
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var playOrder = 2;
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final chapterNames = data.chapters.keys.toList();
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for (var i = 0; i < chapterIndex; i++) {
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navMapStrBuilder
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.writeln(' <navPoint id="chapter$i" playOrder="$playOrder">');
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navMapStrBuilder.writeln(
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' <navLabel><text>${chapterNames[i]}</text></navLabel>');
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navMapStrBuilder.writeln(' <content src="OEBPS/$i.html"/>');
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navMapStrBuilder.writeln(' </navPoint>');
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playOrder++;
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}
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tocNcx.writeAsStringSync('''
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE ncx PUBLIC "-//NISO//DTD ncx 2005-1//EN" "http://www.daisy.org/z3986/2005/ncx-2005-1.dtd">
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<ncx xmlns="http://www.daisy.org/z3986/2005/ncx" version="2005-1">
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<head>
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<meta name="dtb:uid" content="urn:uuid:$uuid"/>
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<meta name="dtb:depth" content="1"/>
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<meta name="dtb:totalPageCount" content="0"/>
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<meta name="dtb:maxPageNumber" content="0"/>
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</head>
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<docTitle>
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<text>${data.title}</text>
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</docTitle>
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<navMap>
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${navMapStrBuilder.toString()}
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</navMap>
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</ncx>
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''');
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// zip
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final zipPath = FilePath.join(cacheDir, '${data.title}.epub');
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ZipFile.compressFolder(workingDir.path, zipPath);
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return File(zipPath);
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}
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Future<File> createEpubWithLocalComic(LocalComic comic) async {
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var chapters = <String, List<File>>{};
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if (comic.chapters == null) {
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chapters[comic.title] =
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(await LocalManager().getImages(comic.id, comic.comicType, 0))
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.map((e) => File(e))
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.toList();
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} else {
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for (var chapter in comic.chapters!.keys) {
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chapters[comic.chapters![chapter]!] = (await LocalManager()
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.getImages(comic.id, comic.comicType, chapter))
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.map((e) => File(e))
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.toList();
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}
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}
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var data = EpubData(
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title: comic.title,
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author: comic.subtitle,
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cover: comic.coverFile,
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chapters: chapters,
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);
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final cacheDir = App.cachePath;
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return Isolate.run(() => overrideIO(() async {
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return createEpubComic(data, cacheDir);
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}));
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}
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