Show organization for host

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

@@ -1704,18 +1704,58 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             }
         }
 
-        private void onOpenLink(Uri uri) {
+        private void onOpenLink(final Uri uri) {
             if (BuildConfig.APPLICATION_ID.equals(uri.getHost()) && "/activate/".equals(uri.getPath())) {
                 LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
                 lbm.sendBroadcast(
                         new Intent(ActivityView.ACTION_ACTIVATE_PRO)
                                 .putExtra("uri", uri));
             } else {
+                final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+
                 View view = LayoutInflater.from(context).inflate(R.layout.dialog_link, null);
                 final EditText etLink = view.findViewById(R.id.etLink);
+                final CheckBox cbOrganization = view.findViewById(R.id.cbOrganization);
                 TextView tvInsecure = view.findViewById(R.id.tvInsecure);
 
+                cbOrganization.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+                    @Override
+                    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                        prefs.edit().putBoolean("show_organization", isChecked).apply();
+                        if (isChecked) {
+                            Bundle args = new Bundle();
+                            args.putParcelable("uri", uri);
+
+                            new SimpleTask<String>() {
+                                @Override
+                                protected void onPreExecute(Bundle args) {
+                                    cbOrganization.setText("…");
+                                }
+
+                                @Override
+                                protected String onExecute(Context context, Bundle args) throws Throwable {
+                                    Uri uri = args.getParcelable("uri");
+                                    String host = uri.getHost();
+                                    return (TextUtils.isEmpty(host) ? null : Helper.getOrganization(host));
+                                }
+
+                                @Override
+                                protected void onExecuted(Bundle args, String organization) {
+                                    cbOrganization.setText(organization == null ? "?" : organization);
+                                }
+
+                                @Override
+                                protected void onException(Bundle args, Throwable ex) {
+                                    cbOrganization.setText(ex.getMessage());
+                                }
+                            }.execute(context, owner, args, "link:domain");
+                        } else
+                            cbOrganization.setText(R.string.title_show_organization);
+                    }
+                });
+
                 etLink.setText(uri.toString());
+                cbOrganization.setChecked(prefs.getBoolean("show_organization", true));
                 tvInsecure.setVisibility("http".equals(uri.getScheme()) ? View.VISIBLE : View.GONE);
 
                 new DialogBuilderLifecycle(context, owner)

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

@@ -123,7 +123,7 @@ public class FragmentOptions extends FragmentBase implements SharedPreferences.O
             "notify_preview", "search_local", "light", "sound",
             "updates", "debug",
             "first", "why", "last_update_check", "app_support", "message_swipe", "message_select", "folder_actions", "folder_sync",
-            "edit_ref_confirmed", "show_html_confirmed", "show_images_confirmed", "print_html_confirmed"
+            "edit_ref_confirmed", "show_html_confirmed", "show_images_confirmed", "print_html_confirmed", "show_organization"
     };
 
     @Override

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

@@ -73,6 +73,8 @@ import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.io.UnsupportedEncodingException;
+import java.net.InetAddress;
+import java.net.URL;
 import java.net.UnknownHostException;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
@@ -93,6 +95,7 @@ import javax.mail.MessageRemovedException;
 import javax.mail.MessagingException;
 import javax.mail.Store;
 import javax.mail.internet.InternetAddress;
+import javax.net.ssl.HttpsURLConnection;
 
 import androidx.annotation.NonNull;
 import androidx.browser.customtabs.CustomTabsIntent;
@@ -1000,4 +1003,19 @@ public class Helper {
     static String sanitizeFilename(String name) {
         return (name == null ? null : name.replaceAll("[^a-zA-Z0-9\\.\\-]", "_"));
     }
+
+    static String getOrganization(String host) throws IOException {
+        InetAddress address = InetAddress.getByName(host);
+        URL url = new URL("https://ipinfo.io/" + address.getHostAddress() + "/org");
+        HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();
+        connection.setRequestMethod("GET");
+        connection.setReadTimeout(15 * 1000);
+        connection.connect();
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
+            String organization = reader.readLine();
+            if ("undefined".equals(organization))
+                organization = null;
+            return organization;
+        }
+    }
 }

app/src/main/res/layout/dialog_link.xml

@@ -12,6 +12,7 @@
         android:text="@string/title_open_link"
         android:textAppearance="@style/TextAppearance.AppCompat.Medium"
         android:textColor="?android:attr/textColorPrimary"
+        android:textStyle="bold"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
@@ -26,6 +27,15 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/tvOpenLink" />
 
+    <CheckBox
+        android:id="@+id/cbOrganization"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="6dp"
+        android:text="@string/title_show_organization"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/etLink" />
+
     <TextView
         android:id="@+id/tvInsecure"
         android:layout_width="wrap_content"
@@ -36,5 +46,5 @@
         android:textColor="?attr/colorWarning"
         android:textStyle="bold"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@id/etLink" />
+        app:layout_constraintTop_toBottomOf="@id/cbOrganization" />
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -523,6 +523,7 @@
     <string name="title_hint_sync">Downloading messages can take some time, depending on the speed of the provider, internet connection and device and on the number of messages. While downloading messages the app might respond slower.</string>
 
     <string name="title_open_link">Open link</string>
+    <string name="title_show_organization">Show organization</string>
     <string name="title_insecure_link">This link is insecure</string>
     <string name="title_select_app">Select app</string>
     <string name="title_updated">There is an update to version %1$s available</string>