larksuite-oapi-sdk-rs

Non-official, Tokio-native Rust SDK for Lark / Feishu (飞书) Open Platform APIs, bots, events, WebSockets, and interactive cards. It follows the official Go SDK closely while providing idiomatic Rust configuration, typed REST resources, event handling, and optional WebSocket, Axum, and channel integration.

Build with Lark / Feishu

Build a bot: receive typed message events and reply through the IM API.
Receive events: use WebSocket long connections without a public callback URL, or verify and dispatch HTTP webhooks.
Automate Open Platform workflows: use typed REST resources for messages, calendars, documents, Base, approvals, and more.

New to the platform? Start with the build a Lark / Feishu bot tutorial. It creates a bot that replies to received messages over a WebSocket long connection.

Highlights

Tenant, user, app, and marketplace token acquisition with configurable caching and retry behavior.
Typed REST resources with query inputs, upload/download helpers, and lazy iterators for supported paginated endpoints.
Raw requests and a Go-compatibility bridge for endpoints not yet promoted to dedicated Rust resources.
Webhook event dispatch with signature verification and encrypted payload decryption.
Optional WebSocket long connections, Axum handlers, and higher-level channel message helpers.

Install

[dependencies]
larksuite-oapi-sdk-rs = "0.3.12"

The minimum supported Rust version is 1.95.0.

Quick Start

Build a client once, then call a typed resource. The SDK handles tenant-token acquisition and request authentication for this endpoint.

use larksuite_oapi_sdk_rs::service::im::v1::CreateMessageReqBody;
use larksuite_oapi_sdk_rs::{LarkClient, RequestOption};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = LarkClient::builder("APP_ID", "APP_SECRET").build()?;
    let body = CreateMessageReqBody {
        receive_id: Some("CHAT_ID".to_string()),
        msg_type: Some("text".to_string()),
        content: Some(r#"{"text":"Hello from Rust"}"#.to_string()),
        uuid: None,
    };

    let response = client
        .im()
        .message
        .create("chat_id", &body, &RequestOption::default())
        .await?;

    println!("success: {}", response.success());
    Ok(())
}

Use LarkClient::builder to set a base URL, timeout, retry limit, token cache, custom headers, marketplace mode, helpdesk credentials, or a JWT client assertion provider. See examples/client_config.rs for the complete setup.

Common Flows

Need	Start here
Build a first Lark / Feishu bot	Tutorial: build a Lark / Feishu bot
Call a typed REST endpoint	`examples/send_message.rs` or generated examples
Call an uncovered endpoint	`examples/raw_api.rs`
Control VC meeting bots	VC meeting bots
Export Spark app source	Spark app export
Preview or apply Spark database schema changes	Spark database migration
Read or modify Mail conversations	Mail user-mailbox threads
Resolve Drive object metadata by token	Drive token lookup
Manage Unified KMS autonomous keys	Unified KMS
Discover or manage BaseApps	`examples/base_v3_app_read.rs` and Base v3 application mode
Manage Base dashboards or dashboard blocks	Base v3 dashboards
Read or update Base dashboard or form sharing	Base v3 sharing
Manage Base v3 forms and questions	Base v3 forms
Manage Base workflows or visible fields	Base workflows and Base visible fields
Configure a Base field extension or share records	Base v3 field extensions and record share links
Read or update modern Docx content	`examples/docs_ai_fetch.rs` and Docs AI document content
Read, edit, or render Slides AI presentations	`examples/slides_ai_read.rs`, `examples/slides_ai_render.rs`, and Slides AI presentation content
Exchange or refresh OAuth tokens	`examples/authen_oauth.rs` and OAuth SSO guide
Join a shared calendar event	Events, WebSockets, and channels
Receive webhook events	`examples/event_handler.rs`
Send a validated interactive card	`examples/card_send.rs` and Cards guide
Stream a CardKit document	`examples/cardkit_stream.rs` and Cards guide
Send a published Card Builder template	`examples/card_template_send.rs` and Cards guide
Handle interactive card callbacks	`examples/card_action_handler.rs`
Run a WebSocket event client	`examples/ws_client.rs` with `ws` enabled
Send channel messages	`examples/channel_send.rs` with `messaging` enabled
Normalize channel messages	`examples/channel_normalize.rs` with `channel` enabled
Search bots or work with OKRs	`examples/bot_search.rs` and `examples/okr_v2.rs`

Guides

Tutorial: build a Lark / Feishu bot: create a WebSocket-connected bot that receives and replies to messages.
Go service and event compatibility: raw requests, the compatibility bridge, and deterministic Go-to-Rust checks.
Cards: versioned Card JSON, CardKit streaming, published Card Builder templates, and callbacks.
Card protocol alignment: source hierarchy and verification workflow for Card JSON and card callbacks.
Events, WebSockets, and channels: webhook dispatch, long connections, trusted user channels, replies, and updates.
OAuth SSO: Feishu and Lark browser login, PKCE, token refresh, and application-owned session handling.
VC meeting bots: event queries and outbound meeting join, leave, message, countdown, and active-meeting operations.
Spark app export: streaming source archives, response validation, and app-type-dependent source snapshots.
Spark database migration: explicit preview, irreversible apply, and caller-owned asynchronous status polling.
Mail user-mailbox threads: conversation reads and batch label, folder, and Trash operations.
Drive token lookup: underlying object metadata resolution without implicit download or export.
Unified KMS: tenant-scoped autonomous-key lifecycle, deletion plans, recovery, and import material.
Base v3 application mode: user-token workspace, BaseApp, page, and block operations.
Base v3 dashboards: dashboard and dashboard block lifecycle, chart data, and layout operations.
Base v3 sharing: dashboard and form sharing reads and partial updates with user or tenant credentials.
Base v3 forms: form lifecycle and form-question operations, including explicit destructive-delete semantics.
Base v3 workflows: workflow lifecycle with caller-owned definition bodies.
Base visible fields: full-list view and form field visibility and ordering.
Base v3 field extensions and record share links: typed extension configuration, cell updates, and batch record links.
Docs AI document content: modern Docx content fetches, updates, asynchronous-task reads, and version-history operations.
Slides AI presentation content: XML presentation and slide operations with version-history support.
Documentation index: detailed guides and runnable examples.

Migration from 0.2

Version 0.3 makes API-breaking corrections so the public Rust surface matches the upstream Lark contracts more closely.

Replace Client with LarkClient and ClientBuilder with LarkClientBuilder.
Replace client.wiki() with client.wiki_v1() or client.wiki_v2().
Replace do_req, do_req_typed, and verb helpers with raw_request* and an ApiReq when a dedicated typed resource is unavailable.
Treat Hire v1 IdNameObject.name as Option<I18n> with zh_cn and en_us fields.
Handle JSON construction failures as LarkError::Json; legacy card element helpers are fallible for the same reason.
Use JsonValue for intentionally dynamic API data instead of public serde_json::Value model fields.

Typed REST responses and incoming event payloads are #[non_exhaustive]. Deserialize them and read their public fields as before, but do not use struct literals to create server-owned values.

Cargo Features

Feature	Description
`ws`	WebSocket long-connection event client with protobuf framing.
`messaging`	High-level outbound messaging and resource operations without WebSocket dependencies.
`channel`	Inbound normalization and runtime policy helpers; enables `messaging` and `ws`.
`axum`	Axum adapters for webhook and card-action handlers.

Cargo unifies enabled features across the dependency graph. Enabling channel therefore enables both messaging and ws; enabling messaging and ws separately does not enable the channel runtime API.

[dependencies]
larksuite-oapi-sdk-rs = { version = "0.3.12", features = ["ws", "axum"] }

API Coverage

The SDK provides dedicated resources across IM, Calendar, Drive, Docs, Sheets, Bitable, Contacts, Approval, VC, Wiki, Hire, and the broader Lark/Feishu OpenAPI surface. Generated smoke tests verify request paths, query inputs, bodies, uploads, downloads, and response handling. See the changelog for release detail and the examples index for runnable calls.

Requirements

Rust 1.95.0 or newer
Rust edition 2024

License

Licensed under MIT.

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