Java tutorial
/** * Copyright (C) 2015 AsamK * * 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ package org.asamk.signal; import net.sourceforge.argparse4j.ArgumentParsers; import net.sourceforge.argparse4j.impl.Arguments; import net.sourceforge.argparse4j.inf.*; import org.apache.commons.io.IOUtils; import org.apache.http.util.TextUtils; import org.asamk.Signal; import org.freedesktop.dbus.DBusConnection; import org.freedesktop.dbus.DBusSigHandler; import org.freedesktop.dbus.exceptions.DBusException; import org.freedesktop.dbus.exceptions.DBusExecutionException; import org.whispersystems.libsignal.InvalidKeyException; import org.whispersystems.signalservice.api.crypto.UntrustedIdentityException; import org.whispersystems.signalservice.api.messages.*; import org.whispersystems.signalservice.api.messages.multidevice.DeviceInfo; import org.whispersystems.signalservice.api.messages.multidevice.ReadMessage; import org.whispersystems.signalservice.api.messages.multidevice.SentTranscriptMessage; import org.whispersystems.signalservice.api.messages.multidevice.SignalServiceSyncMessage; import org.whispersystems.signalservice.api.push.SignalServiceAddress; import org.whispersystems.signalservice.api.push.exceptions.EncapsulatedExceptions; import org.whispersystems.signalservice.api.push.exceptions.NetworkFailureException; import org.whispersystems.signalservice.api.push.exceptions.UnregisteredUserException; import org.whispersystems.signalservice.api.util.PhoneNumberFormatter; import java.io.File; import java.io.IOException; import java.net.URI; import java.net.URISyntaxException; import java.security.Security; import java.util.ArrayList; import java.util.List; import java.util.concurrent.TimeoutException; public class Main { public static final String SIGNAL_BUSNAME = "org.asamk.Signal"; public static final String SIGNAL_OBJECTPATH = "/org/asamk/Signal"; public static void main(String[] args) { // Workaround for BKS truststore Security.insertProviderAt(new org.bouncycastle.jce.provider.BouncyCastleProvider(), 1); Namespace ns = parseArgs(args); if (ns == null) { System.exit(1); } final String username = ns.getString("username"); Manager m; Signal ts; DBusConnection dBusConn = null; try { if (ns.getBoolean("dbus") || ns.getBoolean("dbus_system")) { try { m = null; int busType; if (ns.getBoolean("dbus_system")) { busType = DBusConnection.SYSTEM; } else { busType = DBusConnection.SESSION; } dBusConn = DBusConnection.getConnection(busType); ts = (Signal) dBusConn.getRemoteObject(SIGNAL_BUSNAME, SIGNAL_OBJECTPATH, Signal.class); } catch (DBusException e) { e.printStackTrace(); if (dBusConn != null) { dBusConn.disconnect(); } System.exit(3); return; } } else { String settingsPath = ns.getString("config"); if (TextUtils.isEmpty(settingsPath)) { settingsPath = System.getProperty("user.home") + "/.config/signal"; if (!new File(settingsPath).exists()) { String legacySettingsPath = System.getProperty("user.home") + "/.config/textsecure"; if (new File(legacySettingsPath).exists()) { settingsPath = legacySettingsPath; } } } m = new Manager(username, settingsPath); ts = m; if (m.userExists()) { try { m.load(); } catch (Exception e) { System.err .println("Error loading state file \"" + m.getFileName() + "\": " + e.getMessage()); System.exit(2); return; } } } switch (ns.getString("command")) { case "register": if (dBusConn != null) { System.err.println("register is not yet implemented via dbus"); System.exit(1); } if (!m.userHasKeys()) { m.createNewIdentity(); } try { m.register(ns.getBoolean("voice")); } catch (IOException e) { System.err.println("Request verify error: " + e.getMessage()); System.exit(3); } break; case "verify": if (dBusConn != null) { System.err.println("verify is not yet implemented via dbus"); System.exit(1); } if (!m.userHasKeys()) { System.err.println("User has no keys, first call register."); System.exit(1); } if (m.isRegistered()) { System.err.println("User registration is already verified"); System.exit(1); } try { m.verifyAccount(ns.getString("verificationCode")); } catch (IOException e) { System.err.println("Verify error: " + e.getMessage()); System.exit(3); } break; case "link": if (dBusConn != null) { System.err.println("link is not yet implemented via dbus"); System.exit(1); } // When linking, username is null and we always have to create keys m.createNewIdentity(); String deviceName = ns.getString("name"); if (deviceName == null) { deviceName = "cli"; } try { System.out.println(m.getDeviceLinkUri()); m.finishDeviceLink(deviceName); System.out.println("Associated with: " + m.getUsername()); } catch (TimeoutException e) { System.err.println("Link request timed out, please try again."); System.exit(3); } catch (IOException e) { System.err.println("Link request error: " + e.getMessage()); System.exit(3); } catch (InvalidKeyException e) { e.printStackTrace(); System.exit(3); } catch (UserAlreadyExists e) { System.err.println("The user " + e.getUsername() + " already exists\nDelete \"" + e.getFileName() + "\" before trying again."); System.exit(3); } break; case "addDevice": if (dBusConn != null) { System.err.println("link is not yet implemented via dbus"); System.exit(1); } if (!m.isRegistered()) { System.err.println("User is not registered."); System.exit(1); } try { m.addDeviceLink(new URI(ns.getString("uri"))); } catch (IOException e) { e.printStackTrace(); System.exit(3); } catch (InvalidKeyException e) { e.printStackTrace(); System.exit(2); } catch (URISyntaxException e) { e.printStackTrace(); System.exit(2); } break; case "listDevices": if (dBusConn != null) { System.err.println("listDevices is not yet implemented via dbus"); System.exit(1); } if (!m.isRegistered()) { System.err.println("User is not registered."); System.exit(1); } try { List<DeviceInfo> devices = m.getLinkedDevices(); for (DeviceInfo d : devices) { System.out.println("Device " + d.getId() + (d.getId() == m.getDeviceId() ? " (this device)" : "") + ":"); System.out.println(" Name: " + d.getName()); System.out.println(" Created: " + d.getCreated()); System.out.println(" Last seen: " + d.getLastSeen()); } } catch (IOException e) { e.printStackTrace(); System.exit(3); } break; case "removeDevice": if (dBusConn != null) { System.err.println("removeDevice is not yet implemented via dbus"); System.exit(1); } if (!m.isRegistered()) { System.err.println("User is not registered."); System.exit(1); } try { int deviceId = ns.getInt("deviceId"); m.removeLinkedDevices(deviceId); } catch (IOException e) { e.printStackTrace(); System.exit(3); } break; case "send": if (dBusConn == null && !m.isRegistered()) { System.err.println("User is not registered."); System.exit(1); } if (ns.getBoolean("endsession")) { if (ns.getList("recipient") == null) { System.err.println("No recipients given"); System.err.println("Aborting sending."); System.exit(1); } try { ts.sendEndSessionMessage(ns.<String>getList("recipient")); } catch (IOException e) { handleIOException(e); } catch (EncapsulatedExceptions e) { handleEncapsulatedExceptions(e); } catch (AssertionError e) { handleAssertionError(e); } catch (DBusExecutionException e) { handleDBusExecutionException(e); } catch (UntrustedIdentityException e) { e.printStackTrace(); } } else { String messageText = ns.getString("message"); if (messageText == null) { try { messageText = IOUtils.toString(System.in); } catch (IOException e) { System.err.println("Failed to read message from stdin: " + e.getMessage()); System.err.println("Aborting sending."); System.exit(1); } } try { List<String> attachments = ns.getList("attachment"); if (attachments == null) { attachments = new ArrayList<>(); } if (ns.getString("group") != null) { byte[] groupId = decodeGroupId(ns.getString("group")); ts.sendGroupMessage(messageText, attachments, groupId); } else { ts.sendMessage(messageText, attachments, ns.<String>getList("recipient")); } } catch (IOException e) { handleIOException(e); } catch (EncapsulatedExceptions e) { handleEncapsulatedExceptions(e); } catch (AssertionError e) { handleAssertionError(e); } catch (GroupNotFoundException e) { handleGroupNotFoundException(e); } catch (AttachmentInvalidException e) { System.err.println("Failed to add attachment: " + e.getMessage()); System.err.println("Aborting sending."); System.exit(1); } catch (DBusExecutionException e) { handleDBusExecutionException(e); } catch (UntrustedIdentityException e) { e.printStackTrace(); } } break; case "receive": if (dBusConn != null) { try { dBusConn.addSigHandler(Signal.MessageReceived.class, new DBusSigHandler<Signal.MessageReceived>() { @Override public void handle(Signal.MessageReceived s) { System.out .print(String.format("Envelope from: %s\nTimestamp: %d\nBody: %s\n", s.getSender(), s.getTimestamp(), s.getMessage())); if (s.getGroupId().length > 0) { System.out.println("Group info:"); System.out.println(" Id: " + Base64.encodeBytes(s.getGroupId())); } if (s.getAttachments().size() > 0) { System.out.println("Attachments: "); for (String attachment : s.getAttachments()) { System.out.println("- Stored plaintext in: " + attachment); } } System.out.println(); } }); } catch (DBusException e) { e.printStackTrace(); } while (true) { try { Thread.sleep(10000); } catch (InterruptedException e) { System.exit(0); } } } if (!m.isRegistered()) { System.err.println("User is not registered."); System.exit(1); } int timeout = 60; if (ns.getInt("timeout") != null) { timeout = ns.getInt("timeout"); } boolean returnOnTimeout = true; if (timeout < 0) { returnOnTimeout = false; timeout = 3600; } try { for (int i = 0; i < 10; i++) { System.out.println("Numero di threads: " + Thread.activeCount()); m.receiveMessages(timeout, returnOnTimeout, new ReceiveMessageHandler(m)); } } catch (IOException e) { System.err.println("Error while receiving messages: " + e.getMessage()); System.exit(3); } catch (AssertionError e) { handleAssertionError(e); } break; case "quitGroup": if (dBusConn != null) { System.err.println("quitGroup is not yet implemented via dbus"); System.exit(1); } if (!m.isRegistered()) { System.err.println("User is not registered."); System.exit(1); } try { m.sendQuitGroupMessage(decodeGroupId(ns.getString("group"))); } catch (IOException e) { handleIOException(e); } catch (EncapsulatedExceptions e) { handleEncapsulatedExceptions(e); } catch (AssertionError e) { handleAssertionError(e); } catch (GroupNotFoundException e) { handleGroupNotFoundException(e); } catch (UntrustedIdentityException e) { e.printStackTrace(); } break; case "updateGroup": if (dBusConn != null) { System.err.println("updateGroup is not yet implemented via dbus"); System.exit(1); } if (!m.isRegistered()) { System.err.println("User is not registered."); System.exit(1); } try { byte[] groupId = null; if (ns.getString("group") != null) { groupId = decodeGroupId(ns.getString("group")); } byte[] newGroupId = m.sendUpdateGroupMessage(groupId, ns.getString("name"), ns.<String>getList("member"), ns.getString("avatar")); if (groupId == null) { System.out.println("Creating new group \"" + Base64.encodeBytes(newGroupId) + "\" "); } } catch (IOException e) { handleIOException(e); } catch (AttachmentInvalidException e) { System.err.println("Failed to add avatar attachment for group\": " + e.getMessage()); System.err.println("Aborting sending."); System.exit(1); } catch (GroupNotFoundException e) { handleGroupNotFoundException(e); } catch (EncapsulatedExceptions e) { handleEncapsulatedExceptions(e); } catch (UntrustedIdentityException e) { e.printStackTrace(); } break; case "daemon": if (dBusConn != null) { System.err.println("Stop it."); System.exit(1); } if (!m.isRegistered()) { System.err.println("User is not registered."); System.exit(1); } DBusConnection conn = null; try { try { int busType; if (ns.getBoolean("system")) { busType = DBusConnection.SYSTEM; } else { busType = DBusConnection.SESSION; } conn = DBusConnection.getConnection(busType); conn.exportObject(SIGNAL_OBJECTPATH, m); conn.requestBusName(SIGNAL_BUSNAME); } catch (DBusException e) { e.printStackTrace(); System.exit(3); } try { m.receiveMessages(3600, false, new DbusReceiveMessageHandler(m, conn)); } catch (IOException e) { System.err.println("Error while receiving messages: " + e.getMessage()); System.exit(3); } catch (AssertionError e) { handleAssertionError(e); } } finally { if (conn != null) { conn.disconnect(); } } break; } System.exit(0); } finally { if (dBusConn != null) { dBusConn.disconnect(); } } } private static void handleGroupNotFoundException(GroupNotFoundException e) { System.err.println("Failed to send to group: " + e.getMessage()); System.err.println("Aborting sending."); System.exit(1); } private static void handleDBusExecutionException(DBusExecutionException e) { System.err.println("Cannot connect to dbus: " + e.getMessage()); System.err.println("Aborting."); System.exit(1); } private static byte[] decodeGroupId(String groupId) { try { return Base64.decode(groupId); } catch (IOException e) { System.err.println("Failed to decode groupId (must be base64) \"" + groupId + "\": " + e.getMessage()); System.err.println("Aborting sending."); System.exit(1); return null; } } private static Namespace parseArgs(String[] args) { ArgumentParser parser = ArgumentParsers.newArgumentParser("signal-cli").defaultHelp(true) .description("Commandline interface for Signal.") .version(Manager.PROJECT_NAME + " " + Manager.PROJECT_VERSION); parser.addArgument("-v", "--version").help("Show package version.").action(Arguments.version()); parser.addArgument("--config") .help("Set the path, where to store the config (Default: $HOME/.config/signal)."); MutuallyExclusiveGroup mut = parser.addMutuallyExclusiveGroup(); mut.addArgument("-u", "--username").help("Specify your phone number, that will be used for verification."); mut.addArgument("--dbus").help("Make request via user dbus.").action(Arguments.storeTrue()); mut.addArgument("--dbus-system").help("Make request via system dbus.").action(Arguments.storeTrue()); Subparsers subparsers = parser.addSubparsers().title("subcommands").dest("command") .description("valid subcommands").help("additional help"); Subparser parserLink = subparsers.addParser("link"); parserLink.addArgument("-n", "--name").help("Specify a name to describe this new device."); Subparser parserAddDevice = subparsers.addParser("addDevice"); parserAddDevice.addArgument("--uri").required(true) .help("Specify the uri contained in the QR code shown by the new device."); Subparser parserDevices = subparsers.addParser("listDevices"); Subparser parserRemoveDevice = subparsers.addParser("removeDevice"); parserRemoveDevice.addArgument("-d", "--deviceId").type(int.class).required(true) .help("Specify the device you want to remove. Use listDevices to see the deviceIds."); Subparser parserRegister = subparsers.addParser("register"); parserRegister.addArgument("-v", "--voice").help("The verification should be done over voice, not sms.") .action(Arguments.storeTrue()); Subparser parserVerify = subparsers.addParser("verify"); parserVerify.addArgument("verificationCode") .help("The verification code you received via sms or voice call."); Subparser parserSend = subparsers.addParser("send"); parserSend.addArgument("-g", "--group").help( "Specify the recipient group ID. If there is no '-m', use <CR>CTRL+D<CR> (aka EOF) in order to stop reading from STDIN and send the content"); parserSend.addArgument("recipient").help("Specify the recipients' phone number.").nargs("*"); parserSend.addArgument("-m", "--message").help("Specify the message, if missing standard input is used."); parserSend.addArgument("-a", "--attachment").nargs("*").help("Add file as attachment"); parserSend.addArgument("-e", "--endsession").help("Clear session state and send end session message.") .action(Arguments.storeTrue()); Subparser parserLeaveGroup = subparsers.addParser("quitGroup"); parserLeaveGroup.addArgument("-g", "--group").required(true).help("Specify the recipient group ID."); Subparser parserUpdateGroup = subparsers.addParser("updateGroup"); parserUpdateGroup.addArgument("-g", "--group").help("Specify the recipient group ID."); parserUpdateGroup.addArgument("-n", "--name").help("Specify the new group name."); parserUpdateGroup.addArgument("-a", "--avatar").help("Specify a new group avatar image file"); parserUpdateGroup.addArgument("-m", "--member").nargs("*") .help("Specify one or more members to add to the group"); Subparser parserReceive = subparsers.addParser("receive"); parserReceive.addArgument("-t", "--timeout").type(int.class) .help("Number of seconds to wait for new messages (negative values disable timeout)"); Subparser parserDaemon = subparsers.addParser("daemon"); parserDaemon.addArgument("--system").action(Arguments.storeTrue()) .help("Use DBus system bus instead of user bus."); try { Namespace ns = parser.parseArgs(args); if ("link".equals(ns.getString("command"))) { if (ns.getString("username") != null) { parser.printUsage(); System.err.println("You cannot specify a username (phone number) when linking"); System.exit(2); } } else if (!ns.getBoolean("dbus") && !ns.getBoolean("dbus_system")) { if (ns.getString("username") == null) { parser.printUsage(); System.err.println("You need to specify a username (phone number)"); System.exit(2); } if (!PhoneNumberFormatter.isValidNumber(ns.getString("username"))) { System.err.println("Invalid username (phone number), make sure you include the country code."); System.exit(2); } } if (ns.getList("recipient") != null && !ns.getList("recipient").isEmpty() && ns.getString("group") != null) { System.err.println("You cannot specify recipients by phone number and groups a the same time"); System.exit(2); } return ns; } catch (ArgumentParserException e) { parser.handleError(e); return null; } } private static void handleAssertionError(AssertionError e) { System.err.println("Failed to send/receive message (Assertion): " + e.getMessage()); e.printStackTrace(); System.err.println( "If you use an Oracle JRE please check if you have unlimited strength crypto enabled, see README"); System.exit(1); } private static void handleEncapsulatedExceptions(EncapsulatedExceptions e) { System.err.println("Failed to send (some) messages:"); for (NetworkFailureException n : e.getNetworkExceptions()) { System.err.println("Network failure for \"" + n.getE164number() + "\": " + n.getMessage()); } for (UnregisteredUserException n : e.getUnregisteredUserExceptions()) { System.err.println("Unregistered user \"" + n.getE164Number() + "\": " + n.getMessage()); } for (UntrustedIdentityException n : e.getUntrustedIdentityExceptions()) { System.err.println("Untrusted Identity for \"" + n.getE164Number() + "\": " + n.getMessage()); } } private static void handleIOException(IOException e) { System.err.println("Failed to send message: " + e.getMessage()); } private static class ReceiveMessageHandler implements Manager.ReceiveMessageHandler { final Manager m; public ReceiveMessageHandler(Manager m) { this.m = m; } @Override public void handleMessage(SignalServiceEnvelope envelope, SignalServiceContent content, GroupInfo group) { SignalServiceAddress source = envelope.getSourceAddress(); System.out.println(String.format("Envelope from: %s (device: %d)", source.getNumber(), envelope.getSourceDevice())); if (source.getRelay().isPresent()) { System.out.println("Relayed by: " + source.getRelay().get()); } System.out.println("Timestamp: " + envelope.getTimestamp()); if (envelope.isReceipt()) { System.out.println("Got receipt."); } else if (envelope.isSignalMessage() | envelope.isPreKeySignalMessage()) { if (content == null) { System.out.println("Failed to decrypt message."); } else { if (content.getDataMessage().isPresent()) { SignalServiceDataMessage message = content.getDataMessage().get(); handleSignalServiceDataMessage(message, group); } if (content.getSyncMessage().isPresent()) { System.out.println("Received a sync message"); SignalServiceSyncMessage syncMessage = content.getSyncMessage().get(); if (syncMessage.getContacts().isPresent()) { System.out.println("Received sync contacts"); printAttachment(syncMessage.getContacts().get()); } if (syncMessage.getGroups().isPresent()) { System.out.println("Received sync groups"); printAttachment(syncMessage.getGroups().get()); } if (syncMessage.getRead().isPresent()) { System.out.println("Received sync read messages list"); for (ReadMessage rm : syncMessage.getRead().get()) { System.out.println( "From: " + rm.getSender() + " Message timestamp: " + rm.getTimestamp()); } } if (syncMessage.getRequest().isPresent()) { System.out.println("Received sync request"); if (syncMessage.getRequest().get().isContactsRequest()) { System.out.println(" - contacts request"); } if (syncMessage.getRequest().get().isGroupsRequest()) { System.out.println(" - groups request"); } } if (syncMessage.getSent().isPresent()) { System.out.println("Received sync sent message"); final SentTranscriptMessage sentTranscriptMessage = syncMessage.getSent().get(); System.out.println("To: " + (sentTranscriptMessage.getDestination().isPresent() ? sentTranscriptMessage.getDestination().get() : "Unknown") + " , Message timestamp: " + sentTranscriptMessage.getTimestamp()); SignalServiceDataMessage message = sentTranscriptMessage.getMessage(); handleSignalServiceDataMessage(message, null); } } } } else { System.out.println("Unknown message received."); } System.out.println(); } // TODO remove group parameter private void handleSignalServiceDataMessage(SignalServiceDataMessage message, GroupInfo group) { System.out.println("Message timestamp: " + message.getTimestamp()); if (message.getBody().isPresent()) { System.out.println("Body: " + message.getBody().get()); } if (message.getGroupInfo().isPresent()) { SignalServiceGroup groupInfo = message.getGroupInfo().get(); System.out.println("Group info:"); System.out.println(" Id: " + Base64.encodeBytes(groupInfo.getGroupId())); if (groupInfo.getName().isPresent()) { System.out.println(" Name: " + groupInfo.getName().get()); } else if (group != null) { System.out.println(" Name: " + group.name); } else { System.out.println(" Name: <Unknown group>"); } System.out.println(" Type: " + groupInfo.getType()); if (groupInfo.getMembers().isPresent()) { for (String member : groupInfo.getMembers().get()) { System.out.println(" Member: " + member); } } if (groupInfo.getAvatar().isPresent()) { System.out.println(" Avatar:"); printAttachment(groupInfo.getAvatar().get()); } } if (message.isEndSession()) { System.out.println("Is end session"); } if (message.getAttachments().isPresent()) { System.out.println("Attachments: "); for (SignalServiceAttachment attachment : message.getAttachments().get()) { printAttachment(attachment); } } } private void printAttachment(SignalServiceAttachment attachment) { System.out.println("- " + attachment.getContentType() + " (" + (attachment.isPointer() ? "Pointer" : "") + (attachment.isStream() ? "Stream" : "") + ")"); if (attachment.isPointer()) { final SignalServiceAttachmentPointer pointer = attachment.asPointer(); System.out.println(" Id: " + pointer.getId() + " Key length: " + pointer.getKey().length + (pointer.getRelay().isPresent() ? " Relay: " + pointer.getRelay().get() : "")); System.out.println(" Size: " + (pointer.getSize().isPresent() ? pointer.getSize().get() + " bytes" : "<unavailable>") + (pointer.getPreview().isPresent() ? " (Preview is available: " + pointer.getPreview().get().length + " bytes)" : "")); File file = m.getAttachmentFile(pointer.getId()); if (file.exists()) { System.out.println(" Stored plaintext in: " + file); } } } } private static class DbusReceiveMessageHandler extends ReceiveMessageHandler { final DBusConnection conn; public DbusReceiveMessageHandler(Manager m, DBusConnection conn) { super(m); this.conn = conn; } @Override public void handleMessage(SignalServiceEnvelope envelope, SignalServiceContent content, GroupInfo group) { super.handleMessage(envelope, content, group); if (!envelope.isReceipt() && content != null && content.getDataMessage().isPresent()) { SignalServiceDataMessage message = content.getDataMessage().get(); if (!message.isEndSession() && !(message.getGroupInfo().isPresent() && message.getGroupInfo().get().getType() != SignalServiceGroup.Type.DELIVER)) { List<String> attachments = new ArrayList<>(); if (message.getAttachments().isPresent()) { for (SignalServiceAttachment attachment : message.getAttachments().get()) { if (attachment.isPointer()) { attachments .add(m.getAttachmentFile(attachment.asPointer().getId()).getAbsolutePath()); } } } try { conn.sendSignal(new Signal.MessageReceived(SIGNAL_OBJECTPATH, message.getTimestamp(), envelope.getSource(), message.getGroupInfo().isPresent() ? message.getGroupInfo().get().getGroupId() : new byte[0], message.getBody().isPresent() ? message.getBody().get() : "", attachments)); } catch (DBusException e) { e.printStackTrace(); } } } } private void printAttachment(SignalServiceAttachment attachment) { System.out.println("- " + attachment.getContentType() + " (" + (attachment.isPointer() ? "Pointer" : "") + (attachment.isStream() ? "Stream" : "") + ")"); if (attachment.isPointer()) { final SignalServiceAttachmentPointer pointer = attachment.asPointer(); System.out.println(" Id: " + pointer.getId() + " Key length: " + pointer.getKey().length + (pointer.getRelay().isPresent() ? " Relay: " + pointer.getRelay().get() : "")); System.out.println(" Size: " + (pointer.getSize().isPresent() ? pointer.getSize().get() + " bytes" : "<unavailable>") + (pointer.getPreview().isPresent() ? " (Preview is available: " + pointer.getPreview().get().length + " bytes)" : "")); File file = m.getAttachmentFile(pointer.getId()); if (file.exists()) { System.out.println(" Stored plaintext in: " + file); } } } } }