1 files changed, 55 insertions, 0 deletions
diff --git a/packages/meshbay-cli/src/meshbay_cli/commands/leave.py b/packages/meshbay-cli/src/meshbay_cli/commands/leave.py
new file mode 100644
index 0000000..e9a529e
--- /dev/null
+++ b/packages/meshbay-cli/src/meshbay_cli/commands/leave.py
@@ -0,0 +1,55 @@
+"""
+`leave`: give up a membership. Asked first; `--yes` answers for a script.
+
+The hub's half only, as in the application: the account stops being a member,
+so its nodes can no longer be reached. The node keeps what it holds — the
+identity it pinned, its copy of the keys, the files uploaded — until its
+operator unpins them, and the group key already served opens what it opened
+until the operator rotates it. The owner cannot leave a group.
+"""
+
+import json
+
+from ..client.groups import my_groups
+from ..client.hub import HubError
+from ..client.paths import group_arg, handle, resolve_group
+from ..errors import REFUSED, CliError
+from ..output import confirm, safe, sentence
+from .context import Context
+
+HELP = "leave a group"
+
+
+def add_parser(sub, parent) -> None:
+    p = sub.add_parser("leave", parents=[parent], help=HELP, description=sentence(HELP)
+                       + ". Its files and its chat are no longer reachable from this "
+                       "account; only a new invitation brings it back. The owner cannot "
+                       "leave a group.")
+    p.add_argument("group", metavar="GROUP", help="the group, as `groups` lists it")
+    p.add_argument("-y", "--yes", action="store_true", help="do not ask for confirmation")
+
+
+async def run(ctx: Context) -> int:
+    await ctx.hub.check_version()
+    account = ctx.account()
+    try:
+        group = resolve_group(await my_groups(account), group_arg(ctx.args.group))
+        name = handle(group)
+        if group.get("is_admin"):
+            raise CliError(REFUSED, f"You own {safe(name)}, so you cannot leave it: it "
+                                    "would be left with nobody able to manage it.")
+        confirm(f"Leave {safe(name)}? Its files and chat will no longer be reachable "
+                "from your account.", ctx.args.yes)
+        try:
+            await account.call(account.hub.leave_group, group["id"])
+        except HubError as e:
+            if e.status == 409:
+                raise CliError(REFUSED, e.detail) from e
+            raise
+    finally:
+        await account.close()
+    if ctx.args.json:
+        print(json.dumps({"left": True, "path": name, "id": group["id"]}))
+    else:
+        print(f"Left {safe(name)}.")
+    return 0