feat: Allow choosing the vendor of GmsCore via patch options (#529)

BREAKING CHANGE: The class `MicroGSupport` has been renamed to `GmsCoreSupport`

app/src/main/java/app/revanced/integrations/patches/GmsCoreSupport.java

@@ -0,0 +1,74 @@
+package app.revanced.integrations.patches;
+
+import android.app.SearchManager;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.os.Build;
+import androidx.annotation.RequiresApi;
+import app.revanced.integrations.utils.LogHelper;
+import app.revanced.integrations.utils.ReVancedUtils;
+
+import java.util.Objects;
+
+import static app.revanced.integrations.utils.StringRef.str;
+
+/**
+ * @noinspection unused
+ */
+public class GmsCoreSupport {
+    private static final String GMS_CORE_PACKAGE_NAME
+            = getGmsCoreVendor() + ".android.gms";
+    private static final String DONT_KILL_MY_APP_LINK
+            = "https://dontkillmyapp.com";
+    private static final Uri GMS_CORE_PROVIDER
+            = Uri.parse("content://" + getGmsCoreVendor() + ".android.gsf.gservices/prefix");
+
+    private static void search(Context context, String uriString, String message) {
+        ReVancedUtils.showToastLong(message);
+
+        var intent = new Intent(Intent.ACTION_WEB_SEARCH);
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        intent.putExtra(SearchManager.QUERY, uriString);
+        context.startActivity(intent);
+    }
+
+    @RequiresApi(api = Build.VERSION_CODES.N)
+    public static void checkAvailability() {
+        var context = Objects.requireNonNull(ReVancedUtils.getContext());
+
+        try {
+            context.getPackageManager().getPackageInfo(GMS_CORE_PACKAGE_NAME, PackageManager.GET_ACTIVITIES);
+        } catch (PackageManager.NameNotFoundException exception) {
+            LogHelper.printInfo(() -> "GmsCore was not found", exception);
+            search(context, getGmsCoreDownloadLink(), str("gms_core_not_installed_warning"));
+
+            // Gracefully exit the app, so it does not crash.
+            System.exit(0);
+        }
+
+        try (var client = context.getContentResolver().acquireContentProviderClient(GMS_CORE_PROVIDER)) {
+            if (client != null) return;
+            LogHelper.printInfo(() -> "GmsCore is not running in the background");
+            search(context, DONT_KILL_MY_APP_LINK, str("gms_core_not_running_warning"));
+        }
+    }
+
+    private static String getGmsCoreDownloadLink() {
+        final var vendor = getGmsCoreVendor();
+        switch (vendor) {
+            case "com.mgoogle":
+                return "https://github.com/TeamVanced/VancedMicroG/releases/latest";
+            case "app.revanced":
+                return "https://github.com/revanced/gmscore/releases/latest";
+            default:
+                return vendor + ".android.gms";
+        }
+    }
+
+    // Modified by a patch. Do not touch.
+    private static String getGmsCoreVendor() {
+        return "app.revanced";
+    }
+}