Lark and Feishu are the same product deployed on two isolated clouds
(open.larksuite.com and open.feishu.cn). WeKnora touches both from two
places — the IM bot and the Wiki data-source connector — and this brings
Lark to parity across both. Neither API surface differs, so rather than
duplicate either implementation, each is parametrized by a Region and
registered twice.
IM (internal/im/feishu):
Every API call routes through a.api(), which prefixes the region's
host, and the WebSocket client passes larkws.WithDomain — the SDK
defaults to open.feishu.cn, so Lark long connections would otherwise
fail to authenticate.
Data source (internal/datasource/connector/feishu):
Lark was half-supported: the client honoured a base_url override and a
LarkBaseURL constant existed, but the connector registered only as
"feishu" and the UI never exposed base_url, so Lark wikis could not be
configured at all. Lark is now its own connector type. base_url is kept
as an explicit override so data sources that pointed a "feishu"
connector at open.larksuite.com keep working.
Bugs found and fixed along the way:
- Wiki resource links were hardcoded to https://feishu.cn/wiki/{token} in
four places, so a Lark wiki linked into the wrong cloud entirely.
- Bot identity is now platform-prefixed (feishu:cli_x vs lark:cli_x).
BotIdentity carries a unique index, so without this a Lark channel
would be rejected as a duplicate of an unrelated Feishu bot sharing an
app_id.
- The card image cache is now keyed by app_id. image_keys are issued per
app on one cloud; a Feishu key handed to a Lark app fails the card
update with code=200570.
- The datasource doc claimed Lark "adapts automatically" — it could not,
since the UI had no way to reach base_url.
Permissions are where the clouds genuinely diverge. Identical APIs do not
mean identical permission catalogues: aily:file:read, aily:file:write and
corehr:file:download exist on Feishu but not on Lark, so pasting Feishu's
scope JSON into Lark fails to import. That JSON is also over-broad (it
covers products WeKnora never calls) and simultaneously incomplete (it
omits the drive:*/docx:* scopes the connector needs). Lark therefore gets
its own list, derived from the 17 endpoints the code actually calls and
checked identifier-by-identifier against Lark's own API reference, plus a
full Feishu→Lark mapping table marking each scope verified, unverified,
or absent. Both features use tenant_access_token only — no user_access_
token exists anywhere in the repo — so the user dimension stays empty.
Known limitation: Region.ThinkingText makes Lark's initial card
placeholder English, but once streaming starts the think-block headers
come from the shared MarkdownThinkStyle and are Chinese on every platform
(Lark, Slack, Telegram, Mattermost alike). Fixing that means threading a
locale through FormatIMDisplayContent, which has no platform context — a
cross-platform change, not a Lark one. Documented as such.
The channel-creation 400 message is now derived from validIMPlatforms so
the list cannot drift as platforms are added.
Tests: region invariants and per-region URL construction on both sides,
the Feishu/Lark bot-identity split, platform-to-channel mapping, base_url
override precedence, an end-to-end SendReply against a fake Open Platform
(token fetch, reply, thread-unsupported fallback, hard-error surfacing),
and a ListResources drive asserting wiki links never leak the other
cloud's host.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
qilifan