nmode's Git Repositories - signal-cli/blob - src/main/java/org/asamk/signal/commands/JsonRpcDispatcherCommand.java

   1 package org.asamk.signal.commands;
   2
   3 import com.fasterxml.jackson.core.TreeNode;
   4 import com.fasterxml.jackson.databind.JsonMappingException;
   5 import com.fasterxml.jackson.databind.JsonNode;
   6 import com.fasterxml.jackson.databind.ObjectMapper;
   7 import com.fasterxml.jackson.databind.node.ContainerNode;
   8
   9 import net.sourceforge.argparse4j.impl.Arguments;
  10 import net.sourceforge.argparse4j.inf.Namespace;
  11 import net.sourceforge.argparse4j.inf.Subparser;
  12
  13 import org.asamk.signal.JsonReceiveMessageHandler;
  14 import org.asamk.signal.JsonWriter;
  15 import org.asamk.signal.OutputType;
  16 import org.asamk.signal.OutputWriter;
  17 import org.asamk.signal.commands.exceptions.CommandException;
  18 import org.asamk.signal.commands.exceptions.IOErrorException;
  19 import org.asamk.signal.commands.exceptions.UntrustedKeyErrorException;
  20 import org.asamk.signal.commands.exceptions.UserErrorException;
  21 import org.asamk.signal.jsonrpc.JsonRpcException;
  22 import org.asamk.signal.jsonrpc.JsonRpcReader;
  23 import org.asamk.signal.jsonrpc.JsonRpcRequest;
  24 import org.asamk.signal.jsonrpc.JsonRpcResponse;
  25 import org.asamk.signal.jsonrpc.JsonRpcSender;
  26 import org.asamk.signal.manager.Manager;
  27 import org.asamk.signal.util.Util;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 import java.io.BufferedReader;
  32 import java.io.IOException;
  33 import java.io.InputStreamReader;
  34 import java.util.List;
  35 import java.util.Map;
  36 import java.util.concurrent.TimeUnit;
  37
  38 public class JsonRpcDispatcherCommand implements LocalCommand {
  39
  40     private final static Logger logger = LoggerFactory.getLogger(JsonRpcDispatcherCommand.class);
  41
  42     private static final int USER_ERROR = -1;
  43     private static final int IO_ERROR = -3;
  44     private static final int UNTRUSTED_KEY_ERROR = -4;
  45
  46     @Override
  47     public String getName() {
  48         return "jsonRpc";
  49     }
  50
  51     @Override
  52     public void attachToSubparser(final Subparser subparser) {
  53         subparser.help("Take commands from standard input as line-delimited JSON RPC while receiving messages.");
  54         subparser.addArgument("--ignore-attachments")
  55                 .help("Don’t download attachments of received messages.")
  56                 .action(Arguments.storeTrue());
  57     }
  58
  59     @Override
  60     public List<OutputType> getSupportedOutputTypes() {
  61         return List.of(OutputType.JSON);
  62     }
  63
  64     @Override
  65     public void handleCommand(
  66             final Namespace ns, final Manager m, final OutputWriter outputWriter
  67     ) throws CommandException {
  68         final boolean ignoreAttachments = Boolean.TRUE.equals(ns.getBoolean("ignore-attachments"));
  69         m.setIgnoreAttachments(ignoreAttachments);
  70
  71         final var objectMapper = Util.createJsonObjectMapper();
  72         final var jsonRpcSender = new JsonRpcSender((JsonWriter) outputWriter);
  73
  74         final var receiveThread = receiveMessages(s -> jsonRpcSender.sendRequest(JsonRpcRequest.forNotification(
  75                 "receive",
  76                 objectMapper.valueToTree(s),
  77                 null)), m);
  78
  79         // Maybe this should be handled inside the Manager
  80         while (!m.hasCaughtUpWithOldMessages()) {
  81             try {
  82                 synchronized (m) {
  83                     m.wait();
  84                 }
  85             } catch (InterruptedException ignored) {
  86             }
  87         }
  88
  89         final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
  90
  91         final var jsonRpcReader = new JsonRpcReader(jsonRpcSender, () -> {
  92             try {
  93                 return reader.readLine();
  94             } catch (IOException e) {
  95                 throw new AssertionError(e);
  96             }
  97         });
  98         jsonRpcReader.readRequests((method, params) -> handleRequest(m, objectMapper, method, params),
  99                 response -> logger.debug("Received unexpected response for id {}", response.getId()));
 100
 101         receiveThread.interrupt();
 102         try {
 103             receiveThread.join();
 104         } catch (InterruptedException ignored) {
 105         }
 106     }
 107
 108     private JsonNode handleRequest(
 109             final Manager m, final ObjectMapper objectMapper, final String method, ContainerNode<?> params
 110     ) throws JsonRpcException {
 111         final Object[] result = {null};
 112         final JsonWriter commandOutputWriter = s -> {
 113             if (result[0] != null) {
 114                 throw new AssertionError("Command may only write one json result");
 115             }
 116
 117             result[0] = s;
 118         };
 119
 120         var command = Commands.getCommand(method);
 121         if (!(command instanceof JsonRpcCommand)) {
 122             throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.METHOD_NOT_FOUND,
 123                     "Method not implemented",
 124                     null));
 125         }
 126
 127         try {
 128             parseParamsAndRunCommand(m, objectMapper, params, commandOutputWriter, (JsonRpcCommand<?>) command);
 129         } catch (JsonMappingException e) {
 130             throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.INVALID_REQUEST,
 131                     e.getMessage(),
 132                     null));
 133         } catch (UserErrorException e) {
 134             throw new JsonRpcException(new JsonRpcResponse.Error(USER_ERROR, e.getMessage(), null));
 135         } catch (IOErrorException e) {
 136             throw new JsonRpcException(new JsonRpcResponse.Error(IO_ERROR, e.getMessage(), null));
 137         } catch (UntrustedKeyErrorException e) {
 138             throw new JsonRpcException(new JsonRpcResponse.Error(UNTRUSTED_KEY_ERROR, e.getMessage(), null));
 139         } catch (Throwable e) {
 140             logger.error("Command execution failed", e);
 141             throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.INTERNAL_ERROR,
 142                     e.getMessage(),
 143                     null));
 144         }
 145
 146         Object output = result[0] == null ? Map.of() : result[0];
 147         return objectMapper.valueToTree(output);
 148     }
 149
 150     private <T> void parseParamsAndRunCommand(
 151             final Manager m,
 152             final ObjectMapper objectMapper,
 153             final TreeNode params,
 154             final OutputWriter outputWriter,
 155             final JsonRpcCommand<T> command
 156     ) throws CommandException, JsonMappingException {
 157         T requestParams = null;
 158         final var requestType = command.getRequestType();
 159         if (params != null && requestType != null) {
 160             try {
 161                 requestParams = objectMapper.readValue(objectMapper.treeAsTokens(params), requestType);
 162             } catch (JsonMappingException e) {
 163                 throw e;
 164             } catch (IOException e) {
 165                 throw new AssertionError(e);
 166             }
 167         }
 168         command.handleCommand(requestParams, m, outputWriter);
 169     }
 170
 171     private Thread receiveMessages(JsonWriter jsonWriter, Manager m) {
 172         final var thread = new Thread(() -> {
 173             while (!Thread.interrupted()) {
 174                 try {
 175                     final var receiveMessageHandler = new JsonReceiveMessageHandler(m, jsonWriter);
 176                     m.receiveMessages(1, TimeUnit.HOURS, false, receiveMessageHandler);
 177                     break;
 178                 } catch (IOException e) {
 179                     logger.warn("Receiving messages failed, retrying", e);
 180                 }
 181             }
 182         });
 183
 184         thread.start();
 185
 186         return thread;
 187     }
 188 }