feat(api): 接入微信登录并原生实现咨询域（ECR-049/050）

小程序可在 Go 上完成微信手机号登录、测评、预约和下单，不再反代 Java。 Co-authored-by: Cursor <cursoragent@cursor.com>
2026-09-15 00:26:29 +08:00
parent db4d118f9a
commit 7155b8b53a
45 changed files with 3013 additions and 27 deletions
@@ -0,0 +1,84 @@
+package wechat
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+// Session is the jscode2session result.
+type Session struct {
+	OpenID     string
+	UnionID    string
+	SessionKey string
+}
+
+// Client exchanges a mini-program js_code for a session.
+type Client interface {
+	Code2Session(ctx context.Context, code string) (Session, error)
+}
+
+// APIClient calls api.weixin.qq.com.
+type APIClient struct {
+	AppID  string
+	Secret string
+	HTTP   *http.Client
+}
+
+type wxSessionResp struct {
+	OpenID     string `json:"openid"`
+	SessionKey string `json:"session_key"`
+	UnionID    string `json:"unionid"`
+	ErrCode    int    `json:"errcode"`
+	ErrMsg     string `json:"errmsg"`
+}
+
+// Enabled reports whether WeChat credentials are configured.
+func (c *APIClient) Enabled() bool {
+	return c != nil && strings.TrimSpace(c.AppID) != "" && strings.TrimSpace(c.Secret) != ""
+}
+
+// Code2Session implements Client.
+func (c *APIClient) Code2Session(ctx context.Context, code string) (Session, error) {
+	if !c.Enabled() {
+		return Session{}, errors.New("微信登录未配置")
+	}
+	code = strings.TrimSpace(code)
+	if code == "" {
+		return Session{}, errors.New("缺少微信登录码")
+	}
+	q := url.Values{}
+	q.Set("appid", c.AppID)
+	q.Set("secret", c.Secret)
+	q.Set("js_code", code)
+	q.Set("grant_type", "authorization_code")
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "https://api.weixin.qq.com/sns/jscode2session?"+q.Encode(), nil)
+	if err != nil {
+		return Session{}, err
+	}
+	cli := c.HTTP
+	if cli == nil {
+		cli = &http.Client{Timeout: 10 * time.Second}
+	}
+	resp, err := cli.Do(req)
+	if err != nil {
+		return Session{}, errors.New("微信服务暂不可用")
+	}
+	defer resp.Body.Close()
+	var body wxSessionResp
+	if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
+		return Session{}, errors.New("微信服务暂不可用")
+	}
+	if body.ErrCode != 0 {
+		return Session{}, fmt.Errorf("微信登录失败（%d）", body.ErrCode)
+	}
+	if body.OpenID == "" || body.SessionKey == "" {
+		return Session{}, errors.New("微信登录失败")
+	}
+	return Session{OpenID: body.OpenID, UnionID: body.UnionID, SessionKey: body.SessionKey}, nil
+}