为什么不 byte.NewBuffer 接受全身请求？

Question

我是 golang 的新手，我正在编写一个脚本来使用传入的 webhook 将消息发送到 slack。

slackBody, _ := json.Marshal(SlackRequestBody{Text: msg, EventName: "xxx", AccountId: "xxx",
        EventTime: "xxxxx", UserName: "xxxx", yyy: "xx", Status: "xx"})
    fmt.Println(string(slackBody))
    //test := ioutil.ReadAll(bytes.NewBuffer(slackBody))
    req, err := http.NewRequest(http.MethodPost, webhookUrl, bytes.NewBuffer(slackBody))
    if err != nil {
        return err
    }

    req.Header.Add("Content-Type", "application/json")

    client := &http.Client{Timeout: 10 * time.Second}
    resp, err := client.Do(req)

这个post请求只包含了"req"的几个字request.Can你帮我解决问题。

Answer 1

这里bytes.NewBuffer()没有错。从 slack 的角度来看，它只识别 "text" 字段提供的消息。您需要重新设计 SlackRequestBody 结构。当您使用 Webhook API 发送消息时，您的请求正文应遵循 slack.

给出的结构格式

POST https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX
Content-type: application/json
{
  "text": ...
  "blocks": ...
  "attachments": ...
  "thread_ts": ...
  "mrkdwn": ... 
  ... ... ...
}

因此，您的 SlackRequestBody 结构应该类似于：

package main

import (
    "encoding/json"
    "fmt"
    "time"
)

type SlackRequestBody struct {
    Text            string  `json:"text"`
    Blocks          []Block `json:"blocks,omitempty"`
    ThreadTimestamp string  `json:"thread_ts,omitempty"`
    Mrkdwn          bool    `json:"mrkdwn,omitempty"`
}

type Block struct {
    BlockID string `json:"block_id,omitempty"`
    Type    string `json:"type"`
    Text    Text   `json:"text"`
}

type Text struct {
    Type string `json:"type"`
    Text string `json:"text"`
}

func main() {
    var payload = &SlackRequestBody{
        Text: "Your message",
        Blocks: []Block{
            {
                Type: "section",
                Text: Text{
                    Type: "plain_text",
                    Text: "User Name: XXXX",
                },
                BlockID: "username",
            },
            {
                Type: "section",
                Text: Text{
                    Type: "plain_text",
                    Text: "Event Time: " + time.Now().String(),
                },
                BlockID: "eventTime",
            },
        },
    }

    data, err := json.Marshal(payload)
    if err != nil {
        panic(err)
    }

    fmt.Println(string(data))

}

Go Playground

输出：

{
   "text":"Your message",
   "blocks":[
      {
         "block_id":"username",
         "type":"section",
         "text":{
            "type":"plain_text",
            "text":"User Name: XXXX"
         }
      },
      {
         "block_id":"eventTime",
         "type":"section",
         "text":{
            "type":"plain_text",
            "text":"Event Time: 2020-03-29 14:11:33.533827881 +0600 +06 m=+0.000078203"
         }
      }
   ]
}

推荐大家使用slack官方go client。它将提供更大的灵活性。编码愉快。

为什么不 byte.NewBuffer 接受全身请求？

why not byte.NewBuffer taking full body request?

go

slack-api