Added Public Suffix List

ATTRIBUTION.md

@@ -33,3 +33,4 @@ FairEmail uses:
 * [GoSquared's Flag Icon Set](https://github.com/gosquared/flags). Copyright (c) 2017 Go Squared Ltd. [MIT License](https://github.com/gosquared/flags/blob/master/LICENSE.txt).
 * [OpenDyslexic](https://github.com/antijingoist/opendyslexic). Copyright (c) 12/2012 - 2019. Copyright (c) 2019-07-29, Abbie Gonzalez. [SIL Open Font License 1.1](https://github.com/antijingoist/opendyslexic/blob/master/OFL.txt).
 * [AndroidSVG](https://github.com/BigBadaboom/androidsvg). Copyright 2013 Paul LeBeau, Cave Rock Software Ltd. [Apache License 2.0](https://github.com/BigBadaboom/androidsvg/blob/master/LICENSE).
+* [Public Suffix List](https://publicsuffix.org/). Copyright © 2007–20 Mozilla Foundation. [Mozilla Public License, v. 2.0](https://mozilla.org/MPL/2.0/).

app/src/main/assets/ATTRIBUTION.md

@@ -33,3 +33,4 @@ FairEmail uses:
 * [GoSquared's Flag Icon Set](https://github.com/gosquared/flags). Copyright (c) 2017 Go Squared Ltd. [MIT License](https://github.com/gosquared/flags/blob/master/LICENSE.txt).
 * [OpenDyslexic](https://github.com/antijingoist/opendyslexic). Copyright (c) 12/2012 - 2019. Copyright (c) 2019-07-29, Abbie Gonzalez. [SIL Open Font License 1.1](https://github.com/antijingoist/opendyslexic/blob/master/OFL.txt).
 * [AndroidSVG](https://github.com/BigBadaboom/androidsvg). Copyright 2013 Paul LeBeau, Cave Rock Software Ltd. [Apache License 2.0](https://github.com/BigBadaboom/androidsvg/blob/master/LICENSE).
+* [Public Suffix List](https://publicsuffix.org/). Copyright © 2007–20 Mozilla Foundation. [Mozilla Public License, v. 2.0](https://mozilla.org/MPL/2.0/).

app/src/main/java/eu/faircode/email/EntityMessage.java

@@ -316,14 +316,14 @@ public class EntityMessage implements Serializable {
             int rat = (r == null ? -1 : r.indexOf('@'));
             if (rat < 0)
                 continue;
-            String rdomain = UriHelper.getParentDomain(r.substring(rat + 1));
+            String rdomain = UriHelper.getParentDomain(context, r.substring(rat + 1));
 
             for (Address _from : from) {
                 String f = ((InternetAddress) _from).getAddress();
                 int fat = (f == null ? -1 : f.indexOf('@'));
                 if (fat < 0)
                     continue;
-                String fdomain = UriHelper.getParentDomain(f.substring(fat + 1));
+                String fdomain = UriHelper.getParentDomain(context, f.substring(fat + 1));
 
                 if (!rdomain.equalsIgnoreCase(fdomain))
                     return context.getString(R.string.title_reply_domain, fdomain, rdomain);

app/src/main/java/eu/faircode/email/EntityRule.java

@@ -867,7 +867,7 @@ public class EntityRule {
             int at = sender.indexOf('@');
             if (at > 0) {
                 boolean whitelisted = false;
-                String domain = UriHelper.getParentDomain(sender.substring(at + 1));
+                String domain = UriHelper.getParentDomain(context, sender.substring(at + 1));
                 for (String d : whitelist)
                     if (domain.matches(d)) {
                         whitelisted = true;

app/src/main/java/eu/faircode/email/FragmentAccount.java

@@ -1095,7 +1095,7 @@ public class FragmentAccount extends FragmentBase {
                     db.beginTransaction();
 
                     if (account != null && !account.password.equals(password)) {
-                        String domain = UriHelper.getParentDomain(account.host);
+                        String domain = UriHelper.getParentDomain(context, account.host);
                         String match = (Objects.equals(account.host, domain) ? account.host : "%." + domain);
                         int count = db.identity().setIdentityPassword(account.id, account.user, password, match);
                         Log.i("Updated passwords=" + count + " match=" + match);

app/src/main/java/eu/faircode/email/FragmentPop.java

@@ -488,7 +488,7 @@ public class FragmentPop extends FragmentBase {
                     db.beginTransaction();
 
                     if (account != null && !account.password.equals(password)) {
-                        String domain = UriHelper.getParentDomain(account.host);
+                        String domain = UriHelper.getParentDomain(context, account.host);
                         String match = (Objects.equals(account.host, domain) ? account.host : "%." + domain);
                         int count = db.identity().setIdentityPassword(account.id, account.user, password, match);
                         Log.i("Updated passwords=" + count + " match=" + match);

app/src/main/java/eu/faircode/email/UriHelper.java

@@ -19,16 +19,47 @@ package eu.faircode.email;
     Copyright 2018-2021 by Marcel Bokhorst (M66B)
 */
 
+import android.content.Context;
+import android.text.TextUtils;
+
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.HashSet;
+import java.util.zip.ZipInputStream;
+
 public class UriHelper {
-    static String getParentDomain(String host) {
+    // https://publicsuffix.org/
+    private static final HashSet<String> suffixList = new HashSet<>();
+
+    private static final String SUFFIX_LIST_NAME = "effective_tld_names.dat.txt";
+
+    static String getParentDomain(Context context, String host) {
         if (host == null)
             return null;
 
-        String[] h = host.split("\\.");
-        if (h.length >= 2)
-            return h[h.length - 2] + "." + h[h.length - 1];
+        ensureSuffixList(context);
+
+        String h = host;
+        while (true) {
+            int dot = h.indexOf('.');
+            if (dot < 0)
+                return host;
+            String prefix = h.substring(0, dot);
+            h = h.substring(dot + 1);
 
-        return host;
+            int d = h.indexOf('.');
+            String w = (d < 0 ? null : '*' + h.substring(d));
+
+            synchronized (suffixList) {
+                if ((suffixList.contains(h) || suffixList.contains(w)) &&
+                        !suffixList.contains('!' + h)) {
+                    String parent = prefix + "." + h;
+                    Log.i("Host=" + host + " parent=" + parent);
+                    return parent;
+                }
+            }
+        }
     }
 
     static String getEmailUser(String address) {
@@ -52,4 +83,28 @@ public class UriHelper {
 
         return null;
     }
+
+    static void ensureSuffixList(Context context) {
+        synchronized (suffixList) {
+            if (suffixList.size() > 0)
+                return;
+
+            Log.i("Reading " + SUFFIX_LIST_NAME);
+            try (InputStream is = context.getAssets().open(SUFFIX_LIST_NAME)) {
+                BufferedReader br = new BufferedReader(new InputStreamReader((is)));
+                String line;
+                while ((line = br.readLine()) != null) {
+                    line = line.trim();
+                    if (TextUtils.isEmpty(line))
+                        continue;
+                    if (line.startsWith("//"))
+                        continue;
+                    suffixList.add(line);
+                }
+                Log.i(SUFFIX_LIST_NAME + "=" + suffixList.size());
+            } catch (Throwable ex) {
+                Log.e(ex);
+            }
+        }
+    }
 }