Lark Hertz

Hertz middleware for go-lark.

Middlewares

• LarkChallengeHandler: URL challenge for general events and card callback
• LarkEventHandler: Event v2 (schema 2.0)
• LarkCardHandler: Card callback
• LarkMessageHandler: (Legacy) Incoming message event (schema 1.0)

Installation

go get -u github.com/go-lark/lark-hertz

Usage

package main

import (
	"context"
	"fmt"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/cloudwego/hertz/pkg/app/server"
	larkhertz "github.com/go-lark/lark-hertz"
)

func main() {
	r := server.Default()
	middleware := larkhertz.NewLarkMiddleware()

    // lark server challenge
	r.Use(middleware.LarkChallengeHandler())

    // all supported events
    eventGroup := r.Group("/event")
    {
        eventGroup.Use(middleware.LarkEventHandler())
        eventGroup.POST("/", func(c context.Context, ctx *app.RequestContext) {
            if event, ok := middleware.GetEvent(ctx); ok { // => returns `*lark.EventV2`
            }
        })
    }

    // card callback only
    cardGroup := r.Group("/card")
    {
        cardGroup.Use(middleware.LarkCardHandler())
        cardGroup.POST("/callback", func(c context.Context, ctx *app.RequestContext) {
            if card, ok := middleware.GetCardCallback(ctx); ok { // => returns `*lark.EventCardCallback`
            }
        })
    }

	r.Spin()
}

Event v2

The default mode is event v1. However, Lark has provided event v2 and it applied automatically to newly created bots.

To enable EventV2, we use LarkEventHandler instead of LarkMessageHandler:

r.Use(middleware.LarkEventHandler())

Get the event (e.g. Message):

r.POST("/", func(c context.Context, ctx *app.RequestContext) {
    if event, ok := middleware.GetEvent(ctx); ok { // => GetEvent instead of GetMessage
        if evt.Header.EventType == lark.EventTypeMessageReceived {
            if msg, err := evt.GetMessageReceived(); err == nil {
                fmt.Println(msg.Message.Content)
            }
            // you may have to parse other events
        }
    }
})

Card Callback

We may also setup callback for card actions (e.g. button). The URL challenge part is the same.

We may use LarkCardHandler to handle the actions:

r.Use(middleware.LarkCardHandler())
r.POST("/", func(c context.Context, ctx *app.RequestContext) {
    if event, ok = middleware.GetCardCallback(ctx); ok {
    }
})

Token Verification

middleware.WithTokenVerfication("asodjiaoijoi121iuhiaud")

Encryption

Notice: encryption is not available for card callback, due to restriction from Lark Open Platform.

middleware.WithEncryption("1231asda")

URL Binding

Only bind specific URL for events:

middleware.BindURLPrefix("/abc")

About

Copyright (c) go-lark Developers, 2018-2024.