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

app/src/main/AndroidManifest.xml

@@ -449,6 +449,18 @@
             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"

app/src/main/java/app/fedilab/android/activities/WebActivityPub.java

@@ -0,0 +1,75 @@
+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;
+            }
+        }
+    }
+}