# Python send message to slack app

## 這份文件可以做甚麼？
- 使用python發送訊息到slack app

## steps

1. 建立slack帳戶(已有帳號請跳至 step 2)
2. 在slack中新增一個`workspace`與`channel`(已有`channel`請跳至step 3)
3. 複製channel id
4. 新增slack apps
5. 新增必要權限
6. 安裝slack apps
7. 執行python程式碼

### step 1：建立slack帳戶
到[slack](https://slack.com/)建立新帳號

### step 2：在slack中新增一個`workspace`與`channel`
1. 到[https://app.slack.com/workspace-signin](https://app.slack.com/workspace-signin)登入/建立`workspace`
2. 建立/選擇要接收訊息的`channel`
- `channel`為`public channel`，否則須將機器人手動新增至`channel`內
- 範例：設定為`public channel`

### step 3：複製channel id
在`channel`的`頻道詳細資料`(對`channel`按右鍵)中的`關於`頁面最下方複製`channel id`
- 範例：

### step 4：新增slack apps
到[https://api.slack.com/apps](https://api.slack.com/apps) 建立`slack apps`
- 範例：
1. 
2. 
3. 

### step 5：新增必要權限
1. 點擊OAuth & Permissions`
- 範例：
2. 設定`chat:write`權限
- 範例：
3. 設定`chat:write.public`權限
- 範例：

### step 6：安裝slack apps
1. 點擊`Install App`
2. 點擊安裝
3. 複製`token`

### step 7：執行python程式碼
- 執行以下`python`程式碼
- `TOKEN`為 [step 6](#step-6：安裝slack-apps)最後複製的`token`
- `channel_id`為[step 3](#step-3：複製channel-id)複製的`channel id`
- `text`為想發送到頻道的訊息

import logging
# Import WebClient from Python SDK (github.com/slackapi/python-slack-sdk)
from slack_sdk import WebClient
from slack_sdk.errors import SlackApiError

# WebClient instantiates a client that can call API methods
# When using Bolt, you can use either `app.client` or the `client` passed to listeners.
TOKEN = "YOUR-TOKEN-HERE"

client = WebClient(token=TOKEN)
logger = logging.getLogger(__name__)

# ID of the channel you want to send the message to
channel_id = "YOUR-CHANNEL-ID-HERE"

try:
    # Call the chat.postMessage method using the WebClient
    result = client.chat_postMessage(
        channel=channel_id, 
        text="Hello world" # message you want to send
    )
    logger.info(result)

except SlackApiError as e:
    logger.error(f"Error posting message: {e}")

- 範例：

## 附註
- 透過不同`channel_id`可發送訊息至不同頻道
- 透過不同`slack_apps`/`token`使用不同應用程式發送訊息