Prepare one click unsubscribe

2026-03-30 21:58:52 +02:00 · 2024-02-14 08:59:32 +01:00
parent 9b9db2f1dd
commit 93cbde951c
5 changed files with 188 additions and 15 deletions
--- a/app/src/main/java/eu/faircode/email/FragmentDialogUnsubscribe.java
+++ b/app/src/main/java/eu/faircode/email/FragmentDialogUnsubscribe.java
@@ -0,0 +1,118 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail 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.
+
+    FairEmail 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 FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2024 by Marcel Bokhorst (M66B)
+*/
+
+import android.app.Dialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.net.Uri;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+
+import java.io.IOException;
+import java.net.URL;
+
+import javax.net.ssl.HttpsURLConnection;
+
+public class FragmentDialogUnsubscribe extends FragmentDialogBase {
+    private static final int UNSUBSCRIBE_TIMEOUT = 20 * 1000;
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
+        final Bundle args = getArguments();
+        final String uri = args.getString("uri");
+        final String from = args.getString("from");
+
+        final Context context = getContext();
+
+        View view = LayoutInflater.from(context).inflate(R.layout.dialog_unsubscribe, null);
+        final TextView tvSender = view.findViewById(R.id.tvSender);
+        final TextView tvUri = view.findViewById(R.id.tvUri);
+
+        tvSender.setText(from);
+        tvUri.setVisibility(BuildConfig.DEBUG ? View.VISIBLE : View.GONE);
+        tvUri.setText(uri);
+
+        AlertDialog.Builder builder = new AlertDialog.Builder(context)
+                .setView(view)
+                .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        new SimpleTask<String>() {
+                            @Override
+                            protected String onExecute(Context context, Bundle args) throws Throwable {
+                                final String uri = args.getString("uri");
+                                final String request = "List-Unsubscribe=One-Click";
+
+                                // https://datatracker.ietf.org/doc/html/rfc8058
+
+                                URL url = new URL(uri);
+                                HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
+                                connection.setRequestMethod("POST");
+                                connection.setDoInput(true);
+                                connection.setDoOutput(true);
+                                connection.setReadTimeout(UNSUBSCRIBE_TIMEOUT);
+                                connection.setConnectTimeout(UNSUBSCRIBE_TIMEOUT);
+                                ConnectionHelper.setUserAgent(context, connection);
+                                connection.setRequestProperty("Content-Length", Integer.toString(request.length()));
+                                connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
+                                connection.connect();
+
+                                try {
+                                    connection.getOutputStream().write(request.getBytes());
+
+                                    int status = connection.getResponseCode();
+                                    if (status != HttpsURLConnection.HTTP_OK) {
+                                        String error = "Error " + status + ": " + connection.getResponseMessage();
+                                        String detail = Helper.readStream(connection.getErrorStream());
+                                        throw new IOException(error + " " + detail);
+                                    }
+
+                                    return Helper.readStream(connection.getInputStream());
+                                } finally {
+                                    connection.disconnect();
+                                }
+                            }
+
+                            @Override
+                            protected void onExecuted(Bundle args, String output) {
+                                ToastEx.makeText(context, R.string.title_completed, Toast.LENGTH_LONG).show();
+                            }
+
+                            @Override
+                            protected void onException(Bundle args, Throwable ex) {
+                                Log.unexpectedError(getParentFragment(), ex);
+                            }
+                        }.execute(FragmentDialogUnsubscribe.this, args, "unsubscribe");
+                    }
+                })
+                .setNegativeButton(android.R.string.cancel, null);
+
+        return builder.create();
+    }
+}