Making progress. Confused and untested.

lib/main.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:obtainium/services/apk_service.dart';
+import 'package:obtainium/services/source_service.dart';
 import 'package:provider/provider.dart';
 
 void main() async {
@@ -11,6 +12,7 @@ void main() async {
         create: (context) => APKService(),
         dispose: (context, apkInstallService) => apkInstallService.dispose(),
       ),
+      Provider(create: (context) => SourceService())
     ],
     child: const MyApp(),
   ));
@@ -81,15 +83,17 @@ class _MyHomePageState extends State<MyHomePage> {
       ),
       floatingActionButton: FloatingActionButton(
         onPressed: () {
-          var names = getAppNamesFromGitHubURL(urls[ind]);
-          if (names != null) {
-            Provider.of<APKService>(context, listen: false)
-                .downloadAndInstallAPK(
-                    urls[ind], "${names["author"]!}_${names["appName"]!}");
-            setState(() {
-              ind = ind == (urls.length - 1) ? 0 : ind + 1;
-            });
-          }
+          var source = Provider.of<SourceService>(context).getSource(urls[ind]);
+
+          var standardURL = Provider.of<SourceService>(context)
+              .standardizeURL(urls[ind], source.standardURLRegEx);
+          var names =
+              Provider.of<SourceService>(context).getAppNames(standardURL);
+          Provider.of<APKService>(context, listen: false).downloadAndInstallAPK(
+              urls[ind], "${names.author}_${names.name}");
+          setState(() {
+            ind = ind == (urls.length - 1) ? 0 : ind + 1;
+          });
         },
         tooltip: 'Increment',
         child: const Icon(Icons.add),

lib/services/source_service.dart

@@ -1,5 +1,123 @@
+import 'dart:convert';
+import 'package:http/http.dart';
+import 'package:markdown/markdown.dart';
+import 'package:html/parser.dart';
+
+// Sub-classes of App Source
+
+class AppNames {
+  late String author;
+  late String name;
+
+  AppNames(this.author, this.name);
+}
+
+class APKDetails {
+  late String version;
+  late String downloadUrl;
+
+  APKDetails(this.version, this.downloadUrl);
+}
+
+// App Source abstract class (GitHub, GitLab, etc.)
+
+abstract class AppSource {
+  late RegExp standardURLRegEx;
+  Future<APKDetails?> getLatestAPKUrl(String url);
+  Future<String?> getReadMeHTML(String url);
+  Future<String?> getBase64IconURLFromHTML(String url, String html);
+
+  AppSource(this.standardURLRegEx);
+}
+
+// Specific App Source definitions
+
+class GitHub extends AppSource {
+  GitHub() : super(RegExp(r"^https?://github.com/[^/]*/[^/]*"));
+
+  String getRawContentURL(String url) {
+    int tempInd1 = url.indexOf('://') + 3;
+    int tempInd2 = url.indexOf('://') + 13;
+    return "${url.substring(0, tempInd1)}raw.githubusercontent.com${url.substring(tempInd2)}";
+  }
+
+  @override
+  Future<APKDetails?> getLatestAPKUrl(String url) async {
+    int tempInd = url.indexOf('://') + 3;
+    Response res = await get(Uri.parse(
+        "${url.substring(0, tempInd)}api.${url.substring(tempInd)}/releases/latest"));
+    if (res.statusCode == 200) {
+      var release = jsonDecode(res.body);
+      for (var i = 0; i < release['assets'].length; i++) {
+        if (release['assets'][i]
+            .name
+            .toString()
+            .toLowerCase()
+            .endsWith(".apk")) {
+          return APKDetails(release['tag_name'],
+              release['assets'][i]['browser_download_url']);
+        }
+      }
+      throw "No APK found";
+    } else {
+      throw "Unable to fetch release info";
+    }
+  }
+
+  @override
+  Future<String?> getReadMeHTML(String url) async {
+    String uri = getRawContentURL(url);
+    List<String> possibleSuffixes = ["main/README.md", "master/README.md"];
+    for (var i = 0; i < possibleSuffixes.length; i++) {
+      Response res = await get(Uri.parse("$uri/${possibleSuffixes[i]}"));
+      if (res.statusCode == 200) {
+        return markdownToHtml(res.body);
+      }
+    }
+    return null;
+  }
+
+  @override
+  Future<String?> getBase64IconURLFromHTML(String url, String html) async {
+    var icon = parse(html).getElementsByClassName("img")?[0];
+    if (icon != null) {
+      String uri = getRawContentURL(url);
+      List<String> possibleBranches = ["main", "master"];
+      for (var i = 0; i < possibleBranches.length; i++) {
+        var imgUrl = "$uri/${possibleBranches[i]}/${icon.attributes['src']}";
+        Response res = await get(Uri.parse(imgUrl));
+        if (res.statusCode == 200) {
+          return imgUrl;
+        }
+      }
+    }
+    return null;
+  }
+}
+
 class SourceService {
-  SourceService();
+  String standardizeURL(String url, RegExp standardURLRegEx) {
+    var match = standardURLRegEx.firstMatch(url.toLowerCase());
+    if (match == null) {
+      throw "Not a valid URL";
+    }
+    return url.substring(0, match.end);
+  }
+
+  AppNames getAppNames(String standardURL) {
+    String temp = standardURL.substring(standardURL.indexOf('://') + 3);
+    List<String> names = temp.substring(temp.indexOf('/')).split('/');
+    return AppNames(names[0], names[1]);
+  }
+
+  // Add more source classes here so they are available via the service
+  var github = GitHub();
+  AppSource getSource(String url) {
+    if (url.toLowerCase().contains('://github.com')) {
+      return github;
+    }
+    throw "URL does not match a known source";
+  }
 }
 
 /*
@@ -7,7 +125,7 @@ class SourceService {
 - Make a function that gets the App title and Author name from a github URL, do the same for gitlab (can't fail)
 - Make a function that takes a github URL and finds the latest APK release if any (with version), do the same for gitlab (fail = error)
 - Make a function that takes a github URL and returns a README HTML if any, do the same for gitlab (fail = "no description")
-- Make a function that looks for the first image in a README HTML and returns a small base64 encoded version of it (fail = generic icon)
+- Make a function that looks for the first image in a README HTML and returns its url (fail = no icon)
 
 - Make a function that integrates all above and returns an App object for a given github URL, do the same for gitlab
 

pubspec.lock

@@ -43,6 +43,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.16.0"
+  csslib:
+    dependency: transitive
+    description:
+      name: csslib
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.17.2"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -130,6 +137,27 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  html:
+    dependency: "direct main"
+    description:
+      name: html
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.15.0"
+  http:
+    dependency: "direct main"
+    description:
+      name: http
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.13.5"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.0.1"
   lints:
     dependency: transitive
     description:
@@ -137,6 +165,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.0"
+  markdown:
+    dependency: "direct main"
+    description:
+      name: markdown
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.0.0"
   matcher:
     dependency: transitive
     description:
@@ -310,6 +345,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.8.0"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.1"
   vector_math:
     dependency: transitive
     description:

pubspec.yaml

@@ -41,6 +41,9 @@ dependencies:
   flutter_fgbg: ^0.2.0
   flutter_local_notifications: ^9.7.0
   provider: ^6.0.3
+  http: ^0.13.5
+  markdown: ^6.0.0
+  html: ^0.15.0
 
 dev_dependencies:
   flutter_test: