signal-cli/src/main/java/org/asamk/signal/commands/JsonRpcDispatcherCommand.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.JsonWriter;
import org.asamk.signal.OutputType;
import org.asamk.signal.OutputWriter;
import org.asamk.signal.commands.exceptions.CommandException;
import org.asamk.signal.jsonrpc.SignalJsonRpcDispatcherHandler;
import org.asamk.signal.manager.Manager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.List;
import java.util.function.Supplier;

public class JsonRpcDispatcherCommand implements LocalCommand {

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

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

    @Override
    public void attachToSubparser(final Subparser subparser) {
        subparser.help("Take commands from standard input as line-delimited JSON RPC while receiving messages.");
        subparser.addArgument("--ignore-attachments")
                .help("Don’t download attachments of received messages.")
                .action(Arguments.storeTrue());
    }

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

    @Override
    public void handleCommand(
            final Namespace ns, final Manager m, final OutputWriter outputWriter
    ) throws CommandException {
        final boolean ignoreAttachments = Boolean.TRUE.equals(ns.getBoolean("ignore-attachments"));
        m.setIgnoreAttachments(ignoreAttachments);

        final var jsonOutputWriter = (JsonWriter) outputWriter;
        final Supplier<String> lineSupplier = getLineSupplier(new InputStreamReader(System.in));

        final var handler = new SignalJsonRpcDispatcherHandler(m, jsonOutputWriter, lineSupplier);
        handler.handleConnection();
    }

    private Supplier<String> getLineSupplier(final Reader reader) {
        final var bufferedReader = new BufferedReader(reader);
        return () -> {
            try {
                return bufferedReader.readLine();
            } catch (IOException e) {
                logger.error("Error occurred while reading line", e);
                return null;
            }
        };
    }
}