go言語でSlackに投稿する

環境

go 1.12.5

コード

userName/webhookUrl/iconUrl は適宜調整してね。

type SlackMessage struct {
    Text        string                     `json:"text"`
    Channel     string                     `json:"channel"`
    Username    string                     `json:"username"`
    IconEmoji   string                     `json:"icon_emoji"`
    IconUrl     string                     `json:"icon_url"`
    Attachments *[]*SlackMessageAttachment `json:"attachments"`
}

type SlackMessageAttachment struct {
    Fallback   string                          `json:"fallback"`
    Color      string                          `json:"color"`
    Pretext    string                          `json:"pretext"`
    AuthorName string                          `json:"author_name"`
    AuthorLink string                          `json:"author_link"`
    AuthorIcon string                          `json:"author_icon"`
    Title      string                          `json:"title"`
    Text       string                          `json:"text"`
    Fields     *[]*SlackMessageAttachmentField `json:"fields"`
    ImageUrl   string                          `json:"image_url"`
    ThumbUrl   string                          `json:"thumb_url"`
    Footer     string                          `json:"footer"`
    FooterIcon string                          `json:"footer_icon"`
    TimeStamp  int64                           `json:"ts"`
}

type SlackMessageAttachmentField struct {
    Title string `json:"title"`
    Value string `json:"value"`
    Short bool   `json:"short"`
}

func NotifySlack(channel string, message string, attachments *[]*SlackMessageAttachment) {
    userName := "Admin Client"
    webhookUrl := "https://hooks.slack.com/services/abc/def/ghi"
    iconUrl := "https://example.com/icon.png"

    params, _ := json.Marshal(SlackMessage{
        message,
        channel,
        userName,
        "",
        iconUrl,
        attachments,
    })

    resp, _ := http.PostForm(
        webhookUrl,
        url.Values{"payload": {string(params)}},
    )

    ioutil.ReadAll(resp.Body)
    defer resp.Body.Close()
}

つかいかた

func Test() {
    attachment := &SlackMessageAttachment{
        "フォールバックメッセージだよ",
        "#00ff00",
        "プレテキストだよ",
        "著者だよ",
        "https://www.google.com/",
        "https://img.icons8.com/metro/420/email.png",
        "タイトルだよ",
        "せつめーだよ",
        nil,
        "https://upload.wikimedia.org/wikipedia/en/thumb/e/e0/WPVG_icon_2016.svg/1024px-WPVG_icon_2016.svg.png",
        "https://developer.android.com/guide/practices/ui_guidelines/images/NB_Icon_Mask_Shapes_Ext_02.gif?hl=ja",
        "フッターだよ",
        "https://image.flaticon.com/icons/png/512/33/33447.png",
        0,
    }
    fields := make([]*SlackMessageAttachmentField, 0)
    fields = append(fields, &SlackMessageAttachmentField{
        "あいうえお",
        "かきくけこ",
        true,
    })
    fields = append(fields, &SlackMessageAttachmentField{
        "さしすせそ",
        "たちつてと",
        true,
    })
    fields = append(fields, &SlackMessageAttachmentField{
        "長いテキスト",
        "みなみあそみずのうまれるさとはくすいこうげん",
        false,
    })
    fields = append(fields, &SlackMessageAttachmentField{
        "長いテキスト",
        "Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch",
        false,
    })
    attachment.Fields = &fields
    NotifySlack("#channel_name", "", &[]*SlackMessageAttachment{attachment})
}

結果

所感

構造体作るの面倒くさい。