signal-cli/src/main/java/org/asamk/signal/commands/ReceiveCommand.java

package org.asamk.signal.commands;

import net.sourceforge.argparse4j.impl.Arguments;
import net.sourceforge.argparse4j.inf.Namespace;
import net.sourceforge.argparse4j.inf.Subparser;

import org.asamk.Signal;
import org.asamk.signal.JsonReceiveMessageHandler;
import org.asamk.signal.JsonWriter;
import org.asamk.signal.OutputType;
import org.asamk.signal.OutputWriter;
import org.asamk.signal.PlainTextWriter;
import org.asamk.signal.ReceiveMessageHandler;
import org.asamk.signal.commands.exceptions.CommandException;
import org.asamk.signal.commands.exceptions.IOErrorException;
import org.asamk.signal.commands.exceptions.UnexpectedErrorException;
import org.asamk.signal.json.JsonMessageEnvelope;
import org.asamk.signal.manager.Manager;
import org.asamk.signal.util.DateUtils;
import org.freedesktop.dbus.DBusMap;
import org.freedesktop.dbus.connections.impl.DBusConnection;
import org.freedesktop.dbus.exceptions.DBusException;
import org.freedesktop.dbus.types.Variant;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.Base64;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class ReceiveCommand implements ExtendedDbusCommand, LocalCommand {

    private final static Logger logger = LoggerFactory.getLogger(ReceiveCommand.class);

    @Override
    public String getName() {
        return "receive";
    }

    @Override
    public void attachToSubparser(final Subparser subparser) {
        subparser.help("Query the server for new messages.");
        subparser.addArgument("-t", "--timeout")
                .type(double.class)
                .setDefault(3.0)
                .help("Number of seconds to wait for new messages (negative values disable timeout)");
        subparser.addArgument("--ignore-attachments")
                .help("Don’t download attachments of received messages.")
                .action(Arguments.storeTrue());
    }

    @Override
    public List<OutputType> getSupportedOutputTypes() {
        return List.of(OutputType.PLAIN_TEXT, OutputType.JSON);
    }

    public void handleCommand(
            final Namespace ns, final Signal signal, DBusConnection dbusconnection, final OutputWriter outputWriter
    ) throws CommandException {
        try {
            if (outputWriter instanceof JsonWriter jsonWriter) {

                dbusconnection.addSigHandler(Signal.MessageReceived.class, signal, messageReceived -> {
                    var envelope = JsonMessageEnvelope.from(messageReceived);
                    final var object = Map.of("envelope", envelope);
                    jsonWriter.write(object);
                });

                dbusconnection.addSigHandler(Signal.ReceiptReceived.class, signal, receiptReceived -> {
                    var envelope = JsonMessageEnvelope.from(receiptReceived);
                    final var object = Map.of("envelope", envelope);
                    jsonWriter.write(object);
                });

                dbusconnection.addSigHandler(Signal.SyncMessageReceived.class, signal, syncReceived -> {
                    var envelope = JsonMessageEnvelope.from(syncReceived);
                    final var object = Map.of("envelope", envelope);
                    jsonWriter.write(object);
                });
            } else {
                final var writer = (PlainTextWriter) outputWriter;

                dbusconnection.addSigHandler(Signal.MessageReceivedV2.class, signal, messageReceived -> {
                    writer.println("Envelope from: {}", messageReceived.getSender());
                    writer.println("Timestamp: {}", DateUtils.formatTimestamp(messageReceived.getTimestamp()));
                    writer.println("Body: {}", messageReceived.getMessage());
                    if (messageReceived.getGroupId().length > 0) {
                        writer.println("Group info:");
                        writer.indentedWriter()
                                .println("Id: {}", Base64.getEncoder().encodeToString(messageReceived.getGroupId()));
                    }
                    final var extras = messageReceived.getExtras();
                    printMessageExtras(writer, extras);
                    writer.println();
                });

                dbusconnection.addSigHandler(Signal.ReceiptReceivedV2.class, signal, receiptReceived -> {
                    writer.println("Receipt from: {}", receiptReceived.getSender());
                    writer.println("Timestamp: {}", DateUtils.formatTimestamp(receiptReceived.getTimestamp()));
                    writer.println("Type: {}", receiptReceived.getReceiptType());
                });

                dbusconnection.addSigHandler(Signal.SyncMessageReceivedV2.class, signal, syncReceived -> {
                    writer.println("Sync Envelope from: {} to: {}",
                            syncReceived.getSource(),
                            syncReceived.getDestination());
                    writer.println("Timestamp: {}", DateUtils.formatTimestamp(syncReceived.getTimestamp()));
                    writer.println("Body: {}", syncReceived.getMessage());
                    if (syncReceived.getGroupId().length > 0) {
                        writer.println("Group info:");
                        writer.indentedWriter()
                                .println("Id: {}", Base64.getEncoder().encodeToString(syncReceived.getGroupId()));
                    }
                    final var extras = syncReceived.getExtras();
                    printMessageExtras(writer, extras);
                    writer.println();
                });
            }
        } catch (DBusException e) {
            logger.error("Dbus client failed", e);
            throw new UnexpectedErrorException("Dbus client failed", e);
        }

        double timeout = ns.getDouble("timeout");
        long timeoutMilliseconds = timeout < 0 ? 10000 : (long) (timeout * 1000);

        while (true) {
            try {
                Thread.sleep(timeoutMilliseconds);
            } catch (InterruptedException ignored) {
                break;
            }
            if (timeout >= 0) {
                break;
            }
        }
    }

    private void printMessageExtras(final PlainTextWriter writer, final Map<String, Variant<?>> extras) {
        if (extras.containsKey("attachments")) {
            final List<DBusMap<String, Variant<?>>> attachments = getValue(extras, "attachments");
            if (attachments.size() > 0) {
                writer.println("Attachments:");
                for (var attachment : attachments) {
                    final String value = getValue(attachment, "file");
                    writer.println("- Stored plaintext in: {}", value);
                }
            }
        }
    }

    @SuppressWarnings("unchecked")
    private <T> T getValue(final Map<String, Variant<?>> stringVariantMap, final String field) {
        return (T) stringVariantMap.get(field).getValue();
    }

    @Override
    public void handleCommand(
            final Namespace ns, final Manager m, final OutputWriter outputWriter
    ) throws CommandException {
        double timeout = ns.getDouble("timeout");
        boolean ignoreAttachments = Boolean.TRUE.equals(ns.getBoolean("ignore-attachments"));
        m.setIgnoreAttachments(ignoreAttachments);
        try {
            final var handler = outputWriter instanceof JsonWriter ? new JsonReceiveMessageHandler(m,
                    (JsonWriter) outputWriter) : new ReceiveMessageHandler(m, (PlainTextWriter) outputWriter);
            if (timeout < 0) {
                m.receiveMessages(handler);
            } else {
                m.receiveMessages((long) (timeout * 1000), TimeUnit.MILLISECONDS, handler);
            }
        } catch (IOException e) {
            throw new IOErrorException("Error while receiving messages: " + e.getMessage(), e);
        }
    }
}