func()

in notify/wechat/wechat.go [84:197]

• 91 lines of code
• 18 McCabe index (conditional complexity)

func (n *Notifier) Notify(ctx context.Context, as ...*types.Alert) (bool, error) {
	key, err := notify.ExtractGroupKey(ctx)
	if err != nil {
		return false, err
	}

	level.Debug(n.logger).Log("incident", key)
	data := notify.GetTemplateData(ctx, n.tmpl, as, n.logger)

	tmpl := notify.TmplText(n.tmpl, data, &err)
	if err != nil {
		return false, err
	}

	// Refresh AccessToken over 2 hours
	if n.accessToken == "" || time.Since(n.accessTokenAt) > 2*time.Hour {
		parameters := url.Values{}
		parameters.Add("corpsecret", tmpl(string(n.conf.APISecret)))
		parameters.Add("corpid", tmpl(string(n.conf.CorpID)))
		if err != nil {
			return false, fmt.Errorf("templating error: %w", err)
		}

		u := n.conf.APIURL.Copy()
		u.Path += "gettoken"
		u.RawQuery = parameters.Encode()

		resp, err := notify.Get(ctx, n.client, u.String())
		if err != nil {
			return true, notify.RedactURL(err)
		}
		defer notify.Drain(resp)

		var wechatToken token
		if err := json.NewDecoder(resp.Body).Decode(&wechatToken); err != nil {
			return false, err
		}

		if wechatToken.AccessToken == "" {
			return false, fmt.Errorf("invalid APISecret for CorpID: %s", n.conf.CorpID)
		}

		// Cache accessToken
		n.accessToken = wechatToken.AccessToken
		n.accessTokenAt = time.Now()
	}

	msg := &weChatMessage{
		ToUser:  tmpl(n.conf.ToUser),
		ToParty: tmpl(n.conf.ToParty),
		Totag:   tmpl(n.conf.ToTag),
		AgentID: tmpl(n.conf.AgentID),
		Type:    n.conf.MessageType,
		Safe:    "0",
	}

	if msg.Type == "markdown" {
		msg.Markdown = weChatMessageContent{
			Content: tmpl(n.conf.Message),
		}
	} else {
		msg.Text = weChatMessageContent{
			Content: tmpl(n.conf.Message),
		}
	}
	if err != nil {
		return false, fmt.Errorf("templating error: %w", err)
	}

	var buf bytes.Buffer
	if err := json.NewEncoder(&buf).Encode(msg); err != nil {
		return false, err
	}

	postMessageURL := n.conf.APIURL.Copy()
	postMessageURL.Path += "message/send"
	q := postMessageURL.Query()
	q.Set("access_token", n.accessToken)
	postMessageURL.RawQuery = q.Encode()

	resp, err := notify.PostJSON(ctx, n.client, postMessageURL.String(), &buf)
	if err != nil {
		return true, notify.RedactURL(err)
	}
	defer notify.Drain(resp)

	if resp.StatusCode != 200 {
		return true, notify.NewErrorWithReason(notify.GetFailureReasonFromStatusCode(resp.StatusCode), fmt.Errorf("unexpected status code %v", resp.StatusCode))
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return true, err
	}
	level.Debug(n.logger).Log("response", string(body), "incident", key)

	var weResp weChatResponse
	if err := json.Unmarshal(body, &weResp); err != nil {
		return true, err
	}

	// https://work.weixin.qq.com/api/doc#10649
	if weResp.Code == 0 {
		return false, nil
	}

	// AccessToken is expired
	if weResp.Code == 42001 {
		n.accessToken = ""
		return true, errors.New(weResp.Error)
	}

	return false, errors.New(weResp.Error)
}