--- a/sat_frontends/jp/cmd_pubsub.py	Sun Oct 30 01:06:58 2022 +0200
+++ b/sat_frontends/jp/cmd_pubsub.py	Sun Oct 30 01:06:58 2022 +0200
@@ -1681,6 +1681,42 @@
             self.host.quit()
 
 
+class SignatureSign(base.CommandBase):
+    def __init__(self, host):
+        super().__init__(
+            host,
+            "sign",
+            use_pubsub=True,
+            pubsub_flags={C.NODE, C.SINGLE_ITEM},
+            help=_("sign an item"),
+        )
+
+    def add_parser_options(self):
+        pass
+
+    async def start(self):
+        attachments_data = {
+            "service": self.args.service,
+            "node": self.args.node,
+            "id": self.args.item,
+            "extra": {
+                # we set None to use profile's bare JID
+                "signature": {"signer": None}
+            }
+        }
+        try:
+            await self.host.bridge.psAttachmentsSet(
+                data_format.serialise(attachments_data),
+                self.profile,
+            )
+        except Exception as e:
+            self.disp(f"can't sign the item: {e}", error=True)
+            self.host.quit(C.EXIT_BRIDGE_ERRBACK)
+        else:
+            self.disp(f"item {self.args.item!r} has been signed")
+            self.host.quit(C.EXIT_OK)
+
+
 class SignatureCheck(base.CommandBase):
     def __init__(self, host):
         super().__init__(
@@ -1718,6 +1754,7 @@
 
 class Signature(base.CommandBase):
     subcommands = (
+        SignatureSign,
         SignatureCheck,
     )
 
@@ -2574,7 +2611,7 @@
         )
 
     async def start(self):
-        mb_data = {
+        attachments_data = {
             "service": self.args.service,
             "node": self.args.node,
             "id": self.args.item,
@@ -2584,10 +2621,10 @@
         if self.args.noticed != "keep":
             if self.args.noticed is None:
                 self.args.noticed = C.BOOL_TRUE
-            mb_data["extra"]["noticed"] = C.bool(self.args.noticed)
+            attachments_data["extra"]["noticed"] = C.bool(self.args.noticed)
 
         if self.args.reactions or self.args.reactions_remove:
-            reactions = mb_data["extra"]["reactions"] = {
+            reactions = attachments_data["extra"]["reactions"] = {
                 "operation": operation
             }
             if self.args.replace:
@@ -2597,12 +2634,12 @@
                 reactions["remove"] = self.args.reactions_remove
 
 
-        if not mb_data["extra"]:
+        if not attachments_data["extra"]:
             self.parser.error(_("At leat one attachment must be specified."))
 
         try:
             await self.host.bridge.psAttachmentsSet(
-                data_format.serialise(mb_data),
+                data_format.serialise(attachments_data),
                 self.profile,
             )
         except Exception as e: