feat(login):基本完成用户登录，待测。

service/user.go

@@ -0,0 +1,94 @@
+package service
+
+import (
+	"crypto/sha512"
+	"electricity_bill_calc/cache"
+	"electricity_bill_calc/config"
+	"electricity_bill_calc/exceptions"
+	"electricity_bill_calc/model"
+	"electricity_bill_calc/repository"
+	"fmt"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+type _UserService struct{}
+
+var UserService _UserService
+
+func (_UserService) ProcessEnterpriseUserLogin(username, password string) (*model.Session, error) {
+	user, err := repository.UserRepo.FindUserByUsername(username)
+
+	if err != nil {
+		return nil, err
+	}
+	if user == nil {
+		return nil, exceptions.NewAuthenticationError(404, "用户不存在。")
+	}
+	if user.Type != 0 {
+		return nil, exceptions.NewAuthenticationError(401, "用户类型不正确。")
+	}
+	hash := sha512.New512_256()
+	hash.Write([]byte(password))
+	hashedPassword := fmt.Sprintf("%x", hash.Sum(nil))
+	if hashedPassword != user.Password {
+		return nil, exceptions.NewAuthenticationError(401, "用户凭据不正确。")
+	}
+	if user.ResetNeeded {
+		authErr := exceptions.NewAuthenticationError(401, "用户凭据已失效。")
+		authErr.NeedReset = true
+		return nil, authErr
+	}
+	session := &model.Session{
+		Token:     uuid.New().String(),
+		Uid:       user.Id,
+		Type:      user.Type,
+		Name:      user.Username,
+		ExpiresAt: time.Now().Add(config.ServiceSettings.MaxSessionLife),
+	}
+	userDetial, _ := repository.UserRepo.RetreiveUserDetail(user.Id)
+	if userDetial != nil {
+		session.Name = *userDetial.Name
+	}
+	cache.CacheSession(session)
+	return session, nil
+}
+
+func (_UserService) ProcessManagementUserLogin(username, password string) (*model.Session, error) {
+	user, err := repository.UserRepo.FindUserByUsername(username)
+
+	if err != nil {
+		return nil, err
+	}
+	if user == nil {
+		return nil, exceptions.NewAuthenticationError(404, "用户不存在。")
+	}
+	if user.Type != 1 && user.Type != 2 {
+		return nil, exceptions.NewAuthenticationError(401, "用户类型不正确。")
+	}
+	hash := sha512.New512_256()
+	hash.Write([]byte(password))
+	hashedPassword := fmt.Sprintf("%x", hash.Sum(nil))
+	if hashedPassword != user.Password {
+		return nil, exceptions.NewAuthenticationError(401, "用户凭据不正确。")
+	}
+	if user.ResetNeeded {
+		authErr := exceptions.NewAuthenticationError(401, "用户凭据已失效。")
+		authErr.NeedReset = true
+		return nil, authErr
+	}
+	session := &model.Session{
+		Token:     uuid.New().String(),
+		Uid:       user.Id,
+		Type:      user.Type,
+		Name:      user.Username,
+		ExpiresAt: time.Now().Add(config.ServiceSettings.MaxSessionLife),
+	}
+	userDetial, _ := repository.UserRepo.RetreiveUserDetail(user.Id)
+	if userDetial != nil {
+		session.Name = *userDetial.Name
+	}
+	cache.CacheSession(session)
+	return session, nil
+}