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