bitbake: hashserv: Add become-user API

Adds API that allows a user admin to impersonate another user in the
system. This makes it easier to write external services that have
external authentication, since they can use a common user account to
access the server, then impersonate the logged in user.

(Bitbake rev: 71e2f5b52b686f34df364ae1f2fc058f45cd5e18)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/hashserv/server.py

@@ -255,6 +255,7 @@ class ServerClient(bb.asyncrpc.AsyncServerConnection):
                 "auth": self.handle_auth,
                 "get-user": self.handle_get_user,
                 "get-all-users": self.handle_get_all_users,
+                "become-user": self.handle_become_user,
             }
         )
 
@@ -707,6 +708,23 @@ class ServerClient(bb.asyncrpc.AsyncServerConnection):
 
         return {"username": username}
 
+    @permissions(USER_ADMIN_PERM, allow_anon=False)
+    async def handle_become_user(self, request):
+        username = str(request["username"])
+
+        user = await self.db.lookup_user(username)
+        if user is None:
+            raise bb.asyncrpc.InvokeError(f"User {username} doesn't exist")
+
+        self.user = user
+
+        self.logger.info("Became user %s", username)
+
+        return {
+            "username": self.user.username,
+            "permissions": self.return_perms(self.user.permissions),
+        }
+
 
 class Server(bb.asyncrpc.AsyncServer):
     def __init__(