Implement sendReceipt command

Fixes #305

lib/src/main/java/org/asamk/signal/manager/HandleAction.java

@@ -4,6 +4,7 @@ import org.asamk.signal.manager.groups.GroupIdV1;
 import org.asamk.signal.manager.storage.recipients.RecipientId;
 import org.whispersystems.signalservice.api.push.SignalServiceAddress;
 
+import java.util.List;
 import java.util.Objects;
 
 interface HandleAction {
@@ -23,7 +24,7 @@ class SendReceiptAction implements HandleAction {
 
     @Override
     public void execute(Manager m) throws Throwable {
-        m.sendReceipt(address, timestamp);
+        m.sendDeliveryReceipt(address, List.of(timestamp));
     }
 
     @Override

lib/src/main/java/org/asamk/signal/manager/Manager.java

@@ -1191,11 +1191,31 @@ public class Manager implements Closeable {
         return sendHelper.sendGroupMessage(messageBuilder.build(), Set.of(resolveRecipient(recipient)));
     }
 
-    void sendReceipt(
+    public void sendReadReceipt(
-            SignalServiceAddress remoteAddress, long messageId
+            String sender, List<Long> messageIds
+    ) throws IOException, UntrustedIdentityException, InvalidNumberException {
+        var receiptMessage = new SignalServiceReceiptMessage(SignalServiceReceiptMessage.Type.READ,
+                messageIds,
+                System.currentTimeMillis());
+
+        sendHelper.sendReceiptMessage(receiptMessage, canonicalizeAndResolveRecipient(sender));
+    }
+
+    public void sendViewedReceipt(
+            String sender, List<Long> messageIds
+    ) throws IOException, UntrustedIdentityException, InvalidNumberException {
+        var receiptMessage = new SignalServiceReceiptMessage(SignalServiceReceiptMessage.Type.VIEWED,
+                messageIds,
+                System.currentTimeMillis());
+
+        sendHelper.sendReceiptMessage(receiptMessage, canonicalizeAndResolveRecipient(sender));
+    }
+
+    void sendDeliveryReceipt(
+            SignalServiceAddress remoteAddress, List<Long> messageIds
     ) throws IOException, UntrustedIdentityException {
         var receiptMessage = new SignalServiceReceiptMessage(SignalServiceReceiptMessage.Type.DELIVERY,
-                List.of(messageId),
+                messageIds,
                 System.currentTimeMillis());
 
         sendHelper.sendReceiptMessage(receiptMessage, resolveRecipient(remoteAddress));

man/signal-cli.1.adoc

@@ -199,6 +199,19 @@ Specify the timestamp of the message to which to react.
 *-r*, *--remove*::
 Remove a reaction.
 
+=== sendReceipt
+
+Send a read or viewed receipt to a previously received message.
+
+RECIPIENT::
+Specify the sender’s phone number.
+
+*-t* TIMESTAMP, *--target-timestamp* TIMESTAMP::
+Specify the timestamp of the message to which to react.
+
+*--type* TYPE::
+Specify the receipt type, either `read` (the default) or `viewed`.
+
 === sendTyping
 
 Send typing message to trigger a typing indicator for the recipient.

src/main/java/org/asamk/signal/commands/Commands.java

@@ -30,6 +30,7 @@ public class Commands {
         addCommand(new SendCommand());
         addCommand(new SendContactsCommand());
         addCommand(new SendReactionCommand());
+        addCommand(new SendReceiptCommand());
         addCommand(new SendSyncRequestCommand());
         addCommand(new SendTypingCommand());
         addCommand(new SetPinCommand());

src/main/java/org/asamk/signal/commands/SendReceiptCommand.java

@@ -0,0 +1,56 @@
+package org.asamk.signal.commands;
+
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+
+import org.asamk.signal.OutputWriter;
+import org.asamk.signal.commands.exceptions.CommandException;
+import org.asamk.signal.commands.exceptions.UserErrorException;
+import org.asamk.signal.manager.Manager;
+import org.whispersystems.signalservice.api.crypto.UntrustedIdentityException;
+import org.whispersystems.signalservice.api.util.InvalidNumberException;
+
+import java.io.IOException;
+
+public class SendReceiptCommand implements JsonRpcLocalCommand {
+
+    @Override
+    public String getName() {
+        return "sendReceipt";
+    }
+
+    @Override
+    public void attachToSubparser(final Subparser subparser) {
+        subparser.help("Send a read or viewed receipt to a previously received message.");
+        subparser.addArgument("recipient").help("Specify the sender's phone number.").required(true);
+        subparser.addArgument("-t", "--target-timestamp")
+                .type(long.class)
+                .nargs("+")
+                .help("Specify the timestamp of the messages for which a receipt should be sent.");
+        subparser.addArgument("--type").help("Specify the receipt type.").choices("read", "viewed").setDefault("read");
+    }
+
+    @Override
+    public void handleCommand(
+            final Namespace ns, final Manager m, final OutputWriter outputWriter
+    ) throws CommandException {
+        final var recipient = ns.getString("recipient");
+
+        final var targetTimestamps = ns.<Long>getList("target-timestamp");
+        final var type = ns.getString("type");
+
+        try {
+            if ("read".equals(type)) {
+                m.sendReadReceipt(recipient, targetTimestamps);
+            } else if ("viewed".equals(type)) {
+                m.sendViewedReceipt(recipient, targetTimestamps);
+            } else {
+                throw new UserErrorException("Unknown receipt type: " + type);
+            }
+        } catch (IOException | UntrustedIdentityException e) {
+            throw new UserErrorException("Failed to send message: " + e.getMessage());
+        } catch (InvalidNumberException e) {
+            throw new UserErrorException("Invalid number: " + e.getMessage());
+        }
+    }
+}