feat: add v2 login method

openapi_wss.go

@@ -1,5 +1,18 @@
 package nano
 
+import (
+	"encoding/json"
+	"net/http"
+	"strconv"
+
+	"github.com/pkg/errors"
+)
+
+var (
+	ErrEmptyToken    = errors.New("empty token")
+	ErrInvalidExpire = errors.New("invalid expire")
+)
+
 // GetGeneralWSSGateway 获取通用 WSS 接入点
 //
 // https://bot.q.qq.com/wiki/develop/api/openapi/wss/url_get.html
@@ -32,3 +45,52 @@ type ShardWSSGateway struct {
 func (bot *Bot) GetShardWSSGateway() (*ShardWSSGateway, error) {
 	return bot.getOpenAPIofShardWSSGateway("/gateway/bot")
 }
+
+// GetAppAccessToken 获取接口凭证并保存到 bot.Token
+//
+// https://bot.q.qq.com/wiki/develop/api-231017/dev-prepare/interface-framework/api-use.html#%E8%8E%B7%E5%8F%96%E6%8E%A5%E5%8F%A3%E5%87%AD%E8%AF%81
+func (bot *Bot) GetAppAccessToken() error {
+	req, err := newHTTPEndpointRequestWithAuth("POST", "", AccessTokenAPI, "", "", WriteBodyFromJSON(&struct {
+		A string `json:"appId"`
+		S string `json:"clientSecret"`
+	}{bot.AppID, bot.Secret}))
+	if err != nil {
+		return err
+	}
+	resp, err := bot.client.Do(req)
+	if err != nil {
+		return errors.Wrap(err, getThisFuncName())
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return errors.Wrap(errors.New("http status code: "+strconv.Itoa(resp.StatusCode)), getThisFuncName())
+	}
+	body := struct {
+		C int    `json:"code"`
+		M string `json:"message"`
+		T string `json:"access_token"`
+		E string `json:"expires_in"`
+	}{}
+	err = json.NewDecoder(resp.Body).Decode(&body)
+	if err != nil {
+		return errors.Wrap(err, getThisFuncName())
+	}
+	if body.C != 0 {
+		return errors.Wrap(errors.New("code: "+strconv.Itoa(body.C)+", msg: "+body.M), getThisFuncName())
+	}
+	if body.T == "" {
+		return errors.Wrap(ErrEmptyToken, getThisFuncName())
+	}
+	if body.E == "" {
+		return errors.Wrap(ErrInvalidExpire, getThisFuncName())
+	}
+	bot.token = body.T
+	bot.expiresec, err = strconv.ParseInt(body.E, 10, 64)
+	if err != nil {
+		return errors.Wrap(err, getThisFuncName())
+	}
+	if bot.expiresec <= 0 {
+		return errors.Wrap(ErrInvalidExpire, getThisFuncName())
+	}
+	return nil
+}