264 lines
10 KiB
Java
264 lines
10 KiB
Java
package org.asamk.signal.jsonrpc;
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import com.fasterxml.jackson.core.TreeNode;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.JsonMappingException;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.node.ContainerNode;
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import com.fasterxml.jackson.databind.node.ObjectNode;
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import org.asamk.signal.commands.Command;
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import org.asamk.signal.commands.JsonRpcMultiCommand;
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import org.asamk.signal.commands.JsonRpcRegistrationCommand;
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import org.asamk.signal.commands.JsonRpcSingleCommand;
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import org.asamk.signal.commands.exceptions.CommandException;
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import org.asamk.signal.commands.exceptions.IOErrorException;
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import org.asamk.signal.commands.exceptions.UntrustedKeyErrorException;
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import org.asamk.signal.commands.exceptions.UserErrorException;
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import org.asamk.signal.manager.Manager;
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import org.asamk.signal.manager.MultiAccountManager;
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import org.asamk.signal.manager.RegistrationManager;
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import org.asamk.signal.output.JsonWriter;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.io.IOException;
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import java.nio.channels.OverlappingFileLockException;
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import java.util.Map;
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import java.util.function.Function;
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public class SignalJsonRpcCommandHandler {
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private final static Logger logger = LoggerFactory.getLogger(SignalJsonRpcDispatcherHandler.class);
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private static final int USER_ERROR = -1;
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private static final int IO_ERROR = -3;
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private static final int UNTRUSTED_KEY_ERROR = -4;
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private final Manager m;
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private final MultiAccountManager c;
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private final Function<String, Command> commandProvider;
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public SignalJsonRpcCommandHandler(final Manager m, final Function<String, Command> commandProvider) {
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this.c = null;
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this.m = m;
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this.commandProvider = commandProvider;
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}
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public SignalJsonRpcCommandHandler(final MultiAccountManager c, final Function<String, Command> commandProvider) {
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this.c = c;
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this.m = null;
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this.commandProvider = commandProvider;
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}
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public JsonNode handleRequest(
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final ObjectMapper objectMapper, final String method, ContainerNode<?> params
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) throws JsonRpcException {
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var command = getCommand(method);
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if (c != null) {
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if (command instanceof JsonRpcSingleCommand<?> jsonRpcCommand) {
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final var manager = getManagerFromParams(params);
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if (manager != null) {
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return runCommand(objectMapper, params, new CommandRunnerImpl<>(manager, jsonRpcCommand));
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}
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}
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if (command instanceof JsonRpcMultiCommand<?> jsonRpcCommand) {
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return runCommand(objectMapper, params, new MultiCommandRunnerImpl<>(c, jsonRpcCommand));
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}
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if (command instanceof JsonRpcRegistrationCommand<?> jsonRpcCommand) {
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try (var manager = getRegistrationManagerFromParams(params)) {
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if (manager != null) {
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return runCommand(objectMapper,
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params,
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new RegistrationCommandRunnerImpl<>(manager, c, jsonRpcCommand));
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} else {
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throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.INVALID_PARAMS,
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"Method requires valid account parameter",
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null));
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}
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} catch (IOException e) {
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logger.warn("Failed to close registration manager", e);
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}
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}
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}
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if (command instanceof JsonRpcSingleCommand<?> jsonRpcCommand) {
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if (m != null) {
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return runCommand(objectMapper, params, new CommandRunnerImpl<>(m, jsonRpcCommand));
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}
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var manager = getManagerFromParams(params);
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if (manager == null) {
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final var managers = c.getManagers();
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if (managers.size() == 1) {
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manager = managers.get(0);
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}
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}
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if (manager != null) {
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return runCommand(objectMapper, params, new CommandRunnerImpl<>(manager, jsonRpcCommand));
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} else {
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throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.INVALID_PARAMS,
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"Method requires valid account parameter",
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null));
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}
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}
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throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.METHOD_NOT_FOUND,
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"Method not implemented",
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null));
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}
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private Manager getManagerFromParams(final ContainerNode<?> params) throws JsonRpcException {
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if (params != null && params.hasNonNull("account")) {
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final var manager = c.getManager(params.get("account").asText());
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((ObjectNode) params).remove("account");
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if (manager == null) {
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throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.INVALID_PARAMS,
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"Specified account does not exist",
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null));
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}
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return manager;
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}
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return null;
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}
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private RegistrationManager getRegistrationManagerFromParams(final ContainerNode<?> params) {
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if (params != null && params.has("account")) {
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try {
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final var registrationManager = c.getNewRegistrationManager(params.get("account").asText());
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((ObjectNode) params).remove("account");
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return registrationManager;
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} catch (OverlappingFileLockException e) {
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logger.warn("Account is already in use");
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return null;
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} catch (IOException | IllegalStateException e) {
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logger.warn("Failed to load registration manager", e);
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return null;
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}
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}
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return null;
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}
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private Command getCommand(final String method) {
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return commandProvider.apply(method);
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}
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private record CommandRunnerImpl<T>(Manager m, JsonRpcSingleCommand<T> command) implements CommandRunner<T> {
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@Override
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public void handleCommand(final T request, final JsonWriter jsonWriter) throws CommandException {
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command.handleCommand(request, m, jsonWriter);
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}
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@Override
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public TypeReference<T> getRequestType() {
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return command.getRequestType();
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}
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}
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private record RegistrationCommandRunnerImpl<T>(
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RegistrationManager m, MultiAccountManager c, JsonRpcRegistrationCommand<T> command
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) implements CommandRunner<T> {
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@Override
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public void handleCommand(final T request, final JsonWriter jsonWriter) throws CommandException {
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command.handleCommand(request, m, jsonWriter);
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}
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@Override
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public TypeReference<T> getRequestType() {
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return command.getRequestType();
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}
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}
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private record MultiCommandRunnerImpl<T>(
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MultiAccountManager c, JsonRpcMultiCommand<T> command
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) implements CommandRunner<T> {
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@Override
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public void handleCommand(final T request, final JsonWriter jsonWriter) throws CommandException {
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command.handleCommand(request, c, jsonWriter);
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}
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@Override
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public TypeReference<T> getRequestType() {
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return command.getRequestType();
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}
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}
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interface CommandRunner<T> {
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void handleCommand(T request, JsonWriter jsonWriter) throws CommandException;
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TypeReference<T> getRequestType();
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}
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private JsonNode runCommand(
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final ObjectMapper objectMapper, final ContainerNode<?> params, final CommandRunner<?> command
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) throws JsonRpcException {
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final Object[] result = {null};
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final JsonWriter commandJsonWriter = s -> {
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if (result[0] != null) {
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throw new AssertionError("Command may only write one json result");
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}
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result[0] = s;
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};
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try {
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parseParamsAndRunCommand(objectMapper, params, commandJsonWriter, command);
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} catch (JsonMappingException e) {
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throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.INVALID_REQUEST,
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e.getMessage(),
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null));
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} catch (UserErrorException e) {
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throw new JsonRpcException(new JsonRpcResponse.Error(USER_ERROR,
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e.getMessage(),
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getErrorDataNode(objectMapper, result)));
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} catch (IOErrorException e) {
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throw new JsonRpcException(new JsonRpcResponse.Error(IO_ERROR,
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e.getMessage(),
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getErrorDataNode(objectMapper, result)));
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} catch (UntrustedKeyErrorException e) {
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throw new JsonRpcException(new JsonRpcResponse.Error(UNTRUSTED_KEY_ERROR,
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e.getMessage(),
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getErrorDataNode(objectMapper, result)));
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} catch (Throwable e) {
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logger.error("Command execution failed", e);
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throw new JsonRpcException(new JsonRpcResponse.Error(JsonRpcResponse.Error.INTERNAL_ERROR,
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e.getMessage(),
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getErrorDataNode(objectMapper, result)));
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}
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Object output = result[0] == null ? Map.of() : result[0];
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return objectMapper.valueToTree(output);
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}
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private JsonNode getErrorDataNode(final ObjectMapper objectMapper, final Object[] result) {
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if (result[0] == null) {
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return null;
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}
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return objectMapper.valueToTree(Map.of("response", result[0]));
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}
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private <T> void parseParamsAndRunCommand(
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final ObjectMapper objectMapper,
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final TreeNode params,
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final JsonWriter jsonWriter,
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final CommandRunner<T> command
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) throws CommandException, JsonMappingException {
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T requestParams = null;
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final var requestType = command.getRequestType();
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if (params != null && requestType != null) {
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try {
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requestParams = objectMapper.readValue(objectMapper.treeAsTokens(params), requestType);
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} catch (JsonMappingException e) {
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throw e;
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} catch (IOException e) {
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throw new AssertionError(e);
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}
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}
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command.handleCommand(requestParams, jsonWriter);
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}
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}
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