feat: wecom message init

pkg/wecom/message/send.go

@@ -0,0 +1,58 @@
+package message
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+)
+
+func (c *Client) Send(ctx context.Context, reqData *SendRequest) error {
+
+	token, err := c.auth.AccessToken(ctx)
+	if err != nil {
+		return err
+	}
+
+	url := fmt.Sprintf(
+		"https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token=%s",
+		token,
+	)
+
+	body, err := json.Marshal(reqData)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequestWithContext(
+		ctx,
+		http.MethodPost,
+		url,
+		bytes.NewBuffer(body),
+	)
+	if err != nil {
+		return err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	var result Response
+
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return err
+	}
+
+	if result.ErrCode != 0 {
+		return errors.New(result.ErrMsg)
+	}
+
+	return nil
+}