feat: openid login

pkg/wechat/auth/session.go

@@ -0,0 +1,50 @@
+package auth
+
+import (
+	"fmt"
+
+	"lone-services/pkg/utils"
+
+	jsoniter "github.com/json-iterator/go"
+)
+
+const code2SessionURL = "https://api.weixin.qq.com/sns/jscode2session"
+
+type Session struct {
+	OpenID     string `json:"openid"`
+	UnionID    string `json:"unionid"`
+	SessionKey string `json:"session_key"`
+	ErrCode    int    `json:"errcode"`
+	ErrMsg     string `json:"errmsg"`
+}
+
+func (c *Client) Code2Session(code string) (*Session, error) {
+	if c == nil || c.AppID == utils.StringEmpty || c.Secret == utils.StringEmpty {
+		return nil, fmt.Errorf("wechat app config missing")
+	}
+	if code == utils.StringEmpty {
+		return nil, fmt.Errorf("wechat code empty")
+	}
+
+	body, err := utils.Curl(code2SessionURL).SetData(map[string]string{
+		"appid":      c.AppID,
+		"secret":     c.Secret,
+		"js_code":    code,
+		"grant_type": "authorization_code",
+	}).Get("")
+	if err != nil {
+		return nil, err
+	}
+
+	var session Session
+	if err := jsoniter.UnmarshalFromString(body, &session); err != nil {
+		return nil, err
+	}
+	if session.ErrCode != utils.NumberZero {
+		return nil, fmt.Errorf("wechat code2session: %d %s", session.ErrCode, session.ErrMsg)
+	}
+	if session.OpenID == utils.StringEmpty {
+		return nil, fmt.Errorf("wechat openid empty")
+	}
+	return &session, nil
+}