#1160 - Detects acct and intent in URL with scheme web+activitypub

            android:label="@string/action_cache"

            android:theme="@style/AppThemeBar" />

        <activity android:name=".activities.WebActivityPub"

            android:exported="true">

            <intent-filter>

                <action android:name="android.intent.action.VIEW" />

                <category android:name="android.intent.category.DEFAULT" />

                <category android:name="android.intent.category.BROWSABLE" />

                <data android:host="*" />

                <data android:pathPattern=".*" />

                <data android:scheme="web+activitypub" />

            </intent-filter>

        </activity>

        <provider

            android:name="androidx.core.content.FileProvider"

            android:authorities="${applicationId}.fileProvider"

package app.fedilab.android.activities;

/* Copyright 2025 Thomas Schneider

 *

 * This file is a part of Fedilab

 *

 * This program is free software; you can redistribute it and/or modify it under the terms of the

 * GNU General Public License as published by the Free Software Foundation; either version 3 of the

 * License, or (at your option) any later version.

 *

 * Fedilab is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even

 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General

 * Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along with Fedilab; if not,

 * see <http://www.gnu.org/licenses>. */

import static app.fedilab.android.mastodon.helper.Helper.TAG;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import androidx.annotation.Nullable;

import androidx.appcompat.app.AppCompatActivity;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class WebActivityPub extends AppCompatActivity {

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        Intent appIntent = getIntent();

        String acct = null;

        String intent = null;

        if(appIntent == null) {

            finish();

            return;

        }

        Uri uri = appIntent.getData();

        if(uri == null) {

            finish();

            return;

        }

        String host = uri.getHost();

        String path = uri.getPath();

        String query = uri.getQuery();

        if(path == null || path.isEmpty()) {

            finish();

            return;

        }

        if(query != null) {

            String intentPatternString = "intent=(\\w+)";

            final Pattern intentPattern = Pattern.compile(intentPatternString, Pattern.CASE_INSENSITIVE);

            Matcher matcherIntent = intentPattern.matcher(query);

            while (matcherIntent.find()) {

                intent = matcherIntent.group(1);

            }

        }

        if(path.startsWith("/@")) {

            String[] params = path.split("@");

            if(params.length == 2) {

                acct = params[1] + "@" + host;

            }

        } else if(path.split("/").length > 2) {

            String[] params = path.split("/");

            String root = params[1].toLowerCase();

            if (root.equals("users")) {

                acct = params[2] + "@" + host;

            }

        }

    }

}