Extract dbus client command handling

src/main/java/org/asamk/signal/dbus/DbusCommandHandler.java

@@ -0,0 +1,130 @@
+package org.asamk.signal.dbus;
+
+import org.asamk.Signal;
+import org.asamk.SignalControl;
+import org.asamk.signal.DbusConfig;
+import org.asamk.signal.commands.Command;
+import org.asamk.signal.commands.CommandHandler;
+import org.asamk.signal.commands.LocalCommand;
+import org.asamk.signal.commands.MultiLocalCommand;
+import org.asamk.signal.commands.ProvisioningCommand;
+import org.asamk.signal.commands.RegistrationCommand;
+import org.asamk.signal.commands.exceptions.CommandException;
+import org.asamk.signal.commands.exceptions.UnexpectedErrorException;
+import org.asamk.signal.commands.exceptions.UserErrorException;
+import org.freedesktop.dbus.connections.impl.DBusConnection;
+import org.freedesktop.dbus.errors.UnknownMethod;
+import org.freedesktop.dbus.exceptions.DBusException;
+import org.freedesktop.dbus.exceptions.DBusExecutionException;
+
+public class DbusCommandHandler {
+
+    public static void handleCommand(
+            final Command command,
+            final String account,
+            final DBusConnection dBusConn,
+            final CommandHandler commandHandler
+    ) throws CommandException, DBusException {
+        try {
+            if (command instanceof ProvisioningCommand c) {
+                if (account != null) {
+                    throw new UserErrorException("You cannot specify a account (phone number) when linking");
+                }
+
+                handleProvisioningCommand(c, dBusConn, commandHandler);
+                return;
+            }
+
+            if (account == null && command instanceof MultiLocalCommand c) {
+                handleMultiLocalCommand(c, dBusConn, commandHandler);
+                return;
+            }
+            if (account != null && command instanceof RegistrationCommand c) {
+                handleRegistrationCommand(c, account, dBusConn, commandHandler);
+                return;
+            }
+            if (!(command instanceof LocalCommand localCommand)) {
+                throw new UserErrorException("Command only works in multi-account mode");
+            }
+
+            var accountObjectPath = account == null ? tryGetSingleAccountObjectPath(dBusConn) : null;
+            if (accountObjectPath == null) {
+                accountObjectPath = DbusConfig.getObjectPath(account);
+            }
+            handleLocalCommand(localCommand, accountObjectPath, dBusConn, commandHandler);
+        } catch (UnsupportedOperationException e) {
+            throw new UserErrorException("Command is not yet implemented via dbus", e);
+        } catch (DBusExecutionException e) {
+            throw new UnexpectedErrorException(e.getMessage(), e);
+        }
+    }
+
+    private static String tryGetSingleAccountObjectPath(final DBusConnection dBusConn) throws DBusException, CommandException {
+        var control = dBusConn.getRemoteObject(DbusConfig.getBusname(),
+                DbusConfig.getObjectPath(),
+                SignalControl.class);
+        try {
+            final var accounts = control.listAccounts();
+            if (accounts.size() == 0) {
+                throw new UserErrorException("No local users found, you first need to register or link an account");
+            } else if (accounts.size() > 1) {
+                throw new UserErrorException(
+                        "Multiple users found, you need to specify an account (phone number) with -a");
+            }
+
+            return accounts.get(0).getPath();
+        } catch (UnknownMethod e) {
+            // dbus daemon not running in multi-account mode
+            return null;
+        }
+    }
+
+    private static void handleMultiLocalCommand(
+            final MultiLocalCommand c, final DBusConnection dBusConn, final CommandHandler commandHandler
+    ) throws CommandException, DBusException {
+        final var signalControl = dBusConn.getRemoteObject(DbusConfig.getBusname(),
+                DbusConfig.getObjectPath(),
+                SignalControl.class);
+        try (final var multiAccountManager = new DbusMultiAccountManagerImpl(signalControl, dBusConn)) {
+            commandHandler.handleMultiLocalCommand(c, multiAccountManager);
+        }
+    }
+
+    private static void handleLocalCommand(
+            final LocalCommand c,
+            String accountObjectPath,
+            final DBusConnection dBusConn,
+            final CommandHandler commandHandler
+    ) throws CommandException, DBusException {
+        var signal = dBusConn.getRemoteObject(DbusConfig.getBusname(), accountObjectPath, Signal.class);
+        try (final var manager = new DbusManagerImpl(signal, dBusConn)) {
+            commandHandler.handleLocalCommand(c, manager);
+        }
+    }
+
+    private static void handleRegistrationCommand(
+            final RegistrationCommand c,
+            String account,
+            final DBusConnection dBusConn,
+            final CommandHandler commandHandler
+
+    ) throws CommandException, DBusException {
+        final var signalControl = dBusConn.getRemoteObject(DbusConfig.getBusname(),
+                DbusConfig.getObjectPath(),
+                SignalControl.class);
+        try (final var registrationManager = new DbusRegistrationManagerImpl(account, signalControl, dBusConn)) {
+            commandHandler.handleRegistrationCommand(c, registrationManager);
+        }
+    }
+
+    private static void handleProvisioningCommand(
+            final ProvisioningCommand c, final DBusConnection dBusConn, final CommandHandler commandHandler
+
+    ) throws CommandException, DBusException {
+        final var signalControl = dBusConn.getRemoteObject(DbusConfig.getBusname(),
+                DbusConfig.getObjectPath(),
+                SignalControl.class);
+        final var provisioningManager = new DbusProvisioningManagerImpl(signalControl, dBusConn);
+        commandHandler.handleProvisioningCommand(c, provisioningManager);
+    }
+}