feat(auth): 添加用户登录功能

internal/service/auth_ser/login.go

@@ -0,0 +1,33 @@
+package auth_ser
+
+import (
+	"EnGin/internal/db"
+	"EnGin/internal/ent"
+	"EnGin/internal/ent/user"
+	"EnGin/internal/global"
+	"EnGin/internal/utils/pwd"
+	"context"
+	"errors"
+)
+
+var (
+	ErrUserNotFound = errors.New("用户不存在")
+	ErrAccount      = errors.New("账号和密码错误")
+)
+
+func Login(ctx context.Context, username, password string) (*ent.User, error) {
+	u, err := db.Client.User.Query().Where(user.UsernameEQ(username)).WithRoles().Only(ctx)
+	if err != nil {
+		if ent.IsNotFound(err) {
+			return nil, ErrUserNotFound
+		}
+
+		return nil, global.ErrDbQuery
+	}
+
+	if !pwd.CompareHashAndPassword(u.Password, password) {
+		return nil, ErrAccount
+	}
+
+	return u, nil
+}