A group invite push carries no group name (confirmed across SnowLuma / Lagrange
/ NapCat — all three invite protos only have groupUin + invitorUid), and
get_group_info only resolved joined groups (fetchGroupList → roster), so an
invited group rendered "未知群名". Add a by-id server lookup so the name
resolves even when the bot isn't a member.
- proto-defs: 0x88D_0 request (field1 + config.uin + a request-mask `flags`
block) + response (groupInfo.results: name / member counts / owner / …),
field tags transcribed from
dev/Lagrange.Core/.../OidbSvcTrpcTcp0x88D_0{,Response}.cs.
- protocol: FetchGroupDetail oidb-service. Envelope reserved=0 (NO uinForm) —
Lagrange's GetGroupInfoService builds it with isUid=false.
- core: ContactsApi.fetchGroupDetail(gid) → QQGroupInfo | null; deliberately
NOT remembered into the joined-groups roster (mustn't pollute get_group_list).
- onebot: get_group_info falls back to fetchGroupDetail for non-member groups,
behind a 5-min per-id TTL cache so a burst of invites for one group can't
hammer 0x88D_0 (rate-limit / kick risk). noCache bypasses it.
- tests: request/envelope round-trip (reserved=0, uin, command), response
decode; + non-member resolve / cache-hit / noCache-bypass at the onebot layer.
Live note: byte-identical to Lagrange's 0x88D_0, but not verified against a real
account on this host.
DrSmoothl
b0bfb9e6a7