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 = ns.getBoolean("ignore-attachments");
  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, ignoreAttachments);
  77
  78         final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
  79
  80         final var jsonRpcReader = new JsonRpcReader(jsonRpcSender, () -> {
  81             try {
  82                 return reader.readLine();
  83             } catch (IOException e) {
  84                 throw new AssertionError(e);
  85             }
  86         });
  87         jsonRpcReader.readRequests((method, params) -> handleRequest(m, objectMapper, method, params),
  88                 response -> logger.debug("Received unexpected response for id {}", response.getId()));
  89
  90         receiveThread.interrupt();
  91         try {
  92             receiveThread.join();
  93         } catch (InterruptedException ignored) {
  94         }
  95     }
  96
  97     private JsonNode handleRequest(
  98             final Manager m, final ObjectMapper objectMapper, final String method, ContainerNode<?> params
  99     ) throws JsonRpcException {
 100         final Object[] result = {null};
 101         final JsonWriter commandOutputWriter = s -> {
 102             if (result[0] != null) {
 103                 throw new AssertionError("Command may only write one json result");
 104             }
 105
 106             result[0] = s;
 107         };
 108
 109         var command = Commands.getCommand(method);
 110         if (!(command instanceof JsonRpcCommand)) {
 111             throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.METHOD_NOT_FOUND,
 112                     "Method not implemented",
 113                     null));
 114         }
 115
 116         try {
 117             parseParamsAndRunCommand(m, objectMapper, params, commandOutputWriter, (JsonRpcCommand<?>) command);
 118         } catch (JsonMappingException e) {
 119             throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.INVALID_REQUEST,
 120                     e.getMessage(),
 121                     null));
 122         } catch (UserErrorException e) {
 123             throw new JsonRpcException(new JsonRpcResponse.Error(USER_ERROR, e.getMessage(), null));
 124         } catch (IOErrorException e) {
 125             throw new JsonRpcException(new JsonRpcResponse.Error(IO_ERROR, e.getMessage(), null));
 126         } catch (UntrustedKeyErrorException e) {
 127             throw new JsonRpcException(new JsonRpcResponse.Error(UNTRUSTED_KEY_ERROR, e.getMessage(), null));
 128         } catch (Throwable e) {
 129             logger.error("Command execution failed", e);
 130             throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.INTERNAL_ERROR,
 131                     e.getMessage(),
 132                     null));
 133         }
 134
 135         Object output = result[0] == null ? Map.of() : result[0];
 136         return objectMapper.valueToTree(output);
 137     }
 138
 139     private <T> void parseParamsAndRunCommand(
 140             final Manager m,
 141             final ObjectMapper objectMapper,
 142             final TreeNode params,
 143             final OutputWriter outputWriter,
 144             final JsonRpcCommand<T> command
 145     ) throws CommandException, JsonMappingException {
 146         T requestParams = null;
 147         final var requestType = command.getRequestType();
 148         if (params != null && requestType != null) {
 149             try {
 150                 requestParams = objectMapper.readValue(objectMapper.treeAsTokens(params), requestType);
 151             } catch (JsonMappingException e) {
 152                 throw e;
 153             } catch (IOException e) {
 154                 throw new AssertionError(e);
 155             }
 156         }
 157         command.handleCommand(requestParams, m, outputWriter);
 158     }
 159
 160     private Thread receiveMessages(
 161             JsonWriter jsonWriter, Manager m, boolean ignoreAttachments
 162     ) {
 163         final var thread = new Thread(() -> {
 164             while (!Thread.interrupted()) {
 165                 try {
 166                     final var receiveMessageHandler = new JsonReceiveMessageHandler(m, jsonWriter);
 167                     m.receiveMessages(1, TimeUnit.HOURS, false, ignoreAttachments, receiveMessageHandler);
 168                     break;
 169                 } catch (IOException e) {
 170                     logger.warn("Receiving messages failed, retrying", e);
 171                 }
 172             }
 173         });
 174
 175         thread.start();
 176
 177         return thread;
 178     }
 179 }