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