Add commands to update contact names on Signal servers

As Signal Desktop does not allow its users to update the contact names,
it would be nice to be able to update contact names from signal-cli when
the latter is the master device.

The command `setContactName` allow to set the name for the given contact
in the local store. `sendContacts` can then be used to push the updated
contact list on Signal servers.

Closes #228

man/signal-cli.1.adoc

@@ -223,6 +223,16 @@ with every outgoing messages (excluding group messages).
 *--remove-avatar*::
 	Remove the avatar visible by message recipients.
 
+setContactName
+--------------
+Update name associated to a number on our contact list. This change is only local but can be synchronized to other devices by using `sendContacts` (see below).
+number::
+	Specify the contact phone number.
+name::
+	Specify the new name for this contact.
+sendContacts
+------------
+Update contact list on Signal servers.
 daemon
 ~~~~~~
 signal-cli can run in daemon mode and provides an experimental dbus interface. For

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

@@ -20,6 +20,8 @@ public class Commands {
         addCommand("removeDevice", new RemoveDeviceCommand());
         addCommand("removePin", new RemovePinCommand());
         addCommand("send", new SendCommand());
+        addCommand("sendContacts", new SendContactsCommand());
+        addCommand("setContactName", new SetContactNameCommand());
         addCommand("setPin", new SetPinCommand());
         addCommand("trust", new TrustCommand());
         addCommand("unregister", new UnregisterCommand());

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

@@ -0,0 +1,31 @@
+package org.asamk.signal.commands;
+
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+import org.asamk.signal.manager.Manager;
+import org.whispersystems.signalservice.api.crypto.UntrustedIdentityException;
+
+import java.io.IOException;
+
+public class SendContactsCommand implements LocalCommand {
+
+    @Override
+    public void attachToSubparser(final Subparser subparser) {
+        subparser.help("Send contacts to the signal server.");
+    }
+
+    @Override
+    public int handleCommand(final Namespace ns, final Manager m) {
+        if (!m.isRegistered()) {
+            System.err.println("User is not registered.");
+            return 1;
+        }
+        try {
+            m.sendContacts();
+            return 0;
+        } catch (IOException | UntrustedIdentityException e) {
+            System.err.println("SendContacts error: " + e.getMessage());
+            return 3;
+        }
+    }
+}

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

@@ -0,0 +1,34 @@
+package org.asamk.signal.commands;
+
+import net.sourceforge.argparse4j.impl.Arguments;
+import net.sourceforge.argparse4j.inf.Namespace;
+import net.sourceforge.argparse4j.inf.Subparser;
+import org.asamk.signal.manager.Manager;
+
+public class SetContactNameCommand implements LocalCommand {
+
+    @Override
+    public void attachToSubparser(final Subparser subparser) {
+        subparser.addArgument("number")
+                .help("Contact number");
+        subparser.addArgument("name")
+                .help("New contact name");
+        subparser.help("Set the name of a given contact");
+    }
+
+    @Override
+    public int handleCommand(final Namespace ns, final Manager m) {
+        if (!m.isRegistered()) {
+            System.err.println("User is not registered.");
+            return 1;
+        }
+
+        String number = ns.getString("number");
+        String name = ns.getString("name");
+
+        m.setContactName(number, name);
+
+        return 0;
+    }
+
+}

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

@@ -1416,7 +1416,7 @@ public class Manager implements Signal {
         }
     }
 
-    private void sendContacts() throws IOException, UntrustedIdentityException {
+    public void sendContacts() throws IOException, UntrustedIdentityException {
         File contactsFile = IOUtils.createTempFile();
 
         try {