(download) Implements hentai download pass using image-provider

lib/component/download/hentai.dart

@@ -0,0 +1,122 @@
+// This source code is a part of Project Violet.
+// Copyright (C) 2020. violet-team. Licensed under the Apache-2.0 License.
+
+import 'dart:io';
+
+import 'package:html_unescape/html_unescape_small.dart';
+import 'package:intl/intl.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:violet/component/downloadable.dart';
+import 'package:violet/component/hentai.dart';
+import 'package:violet/network/wrapper.dart' as http;
+import 'dart:convert';
+import 'package:path/path.dart' as path;
+import 'package:crypto/crypto.dart';
+import 'package:violet/component/hitomi/hitomi.dart';
+import 'package:violet/component/hitomi/hitomi_parser.dart';
+import 'package:violet/database/database.dart';
+import 'package:violet/database/query.dart';
+
+class HentaiDonwloadManager extends Downloadable {
+  RegExp urlMatcher;
+
+  HentaiDonwloadManager() {
+    urlMatcher = RegExp(r'^\d+$');
+  }
+
+  @override
+  bool acceptURL(String url) {
+    return urlMatcher.stringMatch(url) == url;
+  }
+
+  @override
+  String defaultFormat() {
+    return "%(extractor)s/[%(id)s] %(title)s/%(file)s.%(ext)s";
+  }
+
+  @override
+  String fav() {
+    return 'https://ltn.hitomi.la/favicon-192x192.png';
+  }
+
+  @override
+  bool loginRequire() {
+    return false;
+  }
+
+  @override
+  bool logined() {
+    return false;
+  }
+
+  @override
+  String name() {
+    return 'hentai';
+  }
+
+  @override
+  Future<void> setSession(String id, String pwd) async {}
+
+  @override
+  Future<bool> tryLogin() async {
+    return true;
+  }
+
+  @override
+  Future<List<DownloadTask>> createTask(
+      String url, GeneralDownloadProgress gdp) async {
+    var query = (await HentaiManager.idSearch(url, 0)).item1;
+
+    if (query.length == 0) {
+      return null;
+    }
+
+    var target = query[0];
+
+    gdp.simpleInfoCallback('[${target.id()}] ${target.title()}');
+
+    var provider = await HentaiManager.getImageProvider(target);
+
+    await provider.init();
+
+    gdp.thumbnailCallback(await provider.getThumbnailUrl(),
+        jsonEncode(await provider.getHeader(0)));
+
+    var result = List<DownloadTask>();
+
+    for (int i = 0; i < provider.length(); i++) {
+      var page = await provider.getImageUrl(i);
+      var header = await provider.getHeader(i);
+
+      result.add(
+        DownloadTask(
+          url: page,
+          filename: page.split('/').last,
+          headers: header,
+          format: FileNameFormat(
+            title: target.title(),
+            id: target.id().toString(),
+            laugage: target.language(),
+            uploadDate: target.getDateTime().toString(),
+            filenameWithoutExtension: intToString(i, pad: 3),
+            extension: path.extension(page.split('/').last).replaceAll(".", ""),
+            extractor: 'hentai',
+          ),
+        ),
+      );
+
+      gdp.progressCallback(i + 1, provider.length());
+    }
+
+    return result;
+  }
+
+  // https://stackoverflow.com/questions/15193983/is-there-a-built-in-method-to-pad-a-string
+  static String intToString(int i, {int pad: 0}) {
+    var str = i.toString();
+    var paddingToAdd = pad - str.length;
+    return (paddingToAdd > 0)
+        ? "${new List.filled(paddingToAdd, '0').join('')}$i"
+        : str;
+  }
+}

lib/pages/article_info/article_info_page.dart

@@ -159,9 +159,7 @@ class ArticleInfoPage extends StatelessWidget {
         );
         return;
       }
-      await DownloadPageManager.appendTask('https://hitomi.la/galleries/' +
-          data.queryResult.id().toString() +
-          '.html');
+      await DownloadPageManager.appendTask(data.queryResult.id().toString());
       Navigator.pop(context);
     }
   }