asp.net core weapi 结合identity完成登录/注册/角色/权限分配

1.安装所需要的nuget包

    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="6.0.24" />
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="6.0.24" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.0.24" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="6.0.24">

2.注入sqlserver数据库服务完成identity数据库的迁移

  "ConnectionStrings": {
    "defaultsql": "server=.;uid=sa;pwd=peng@123;database=ide"
  }

     builder.Services.AddDbContext<IdentityDbContext>(p =>
            {
                p.UseSqlServer(builder.Configuration.GetConnectionString("defaultsql"), b => b.MigrationsAssembly("Log4NetTest"));
            });

3.在程序包管理控制台执行下面依次命令，完成用户权限管理表的迁移

add-migration init 
update-datebase

执行完后，数据库就多了下面的表

4.创建一个用户账号的类用于登录和注册

 public class account
    {
        public string usename { get; set; }
        public string password { get; set; }
    }

5.注入identity服务

 builder.Services.AddIdentity<IdentityUser, IdentityRole>()
    .AddEntityFrameworkStores<IdentityDbContext>();

6.注册

 private SignInManager<IdentityUser> _signInManager;
 private UserManager<IdentityUser> _userManager;
 public WeatherForecastController( SignInManager<IdentityUser> signInManager)
        {
            _signInManager = signInManager;
            _userManager = userManager;
        }
              /// 

        /// 注册
        /// 
        /// 
        /// 
        [HttpPost]
        public async Task<string> Register(string usename, string pwd)
        {
            IdentityUser user = new IdentityUser()
            {
                UserName = usename
            };
            var result = await _userManager.CreateAsync(user, pwd);
            if (result.Succeeded)
            {
                return "添加成功";
            }
            return "失败";
        }

执行swagger查询数据库，添加了一条数据（表示注入成功）

6.登录

        /// 

        ///
        /// 登录
        /// 
        /// 
        /// 
        [HttpPost]
        public async Task<string> Login(string usename, string pwd)
        {
            var user = await _userManager.FindByNameAsync(usename);
            if (user != null)
            {
                var re = await _signInManager.PasswordSignInAsync(user, pwd, false, false);
                if (re.Succeeded)
                {
                    return "登录成功";
                }
                return "登录失败";
            }
            return "登录失败";
        }

使用刚才注册的账号，在swagger中调用Login方法，返回登录成功。
补充：代码中使用了微软默认的策略，比如密码的长度限制和复杂度，尝试密码失败次数等。可以根据自己的需求进行更改

 builder.Services.Configure<IdentityOptions>(options =>
            {
                // 配置密码要求
                options.Password.RequireDigit = true;//数字
                options.Password.RequireLowercase = true;//小写字母
                options.Password.RequireUppercase = true;//大写字母
                options.Password.RequireNonAlphanumeric = true;//特殊字符
                options.Password.RequiredLength = 8;//密码长度

                // 配置用户锁定选项
                options.Lockout.DefaultLockoutTimeSpan = TimeSpan.FromMinutes(5);//锁定时间
                options.Lockout.MaxFailedAccessAttempts = 5;//失败次数
                options.Lockout.AllowedForNewUsers = true;

                // 配置用户登录选项
                options.SignIn.RequireConfirmedEmail = false;
                options.SignIn.RequireConfirmedPhoneNumber = false;
            });

7.新增角色

  private RoleManager<IdentityRole> _roleManager;
  public WeatherForecastController(RoleManager<IdentityRole> roleManager)
        {
            _roleManager = roleManager;
        }
        
        /// 

        /// 添加角色
        /// 
        [HttpPost]
        public async Task<string> AddRole(string RoleName)
        {
            var rolename = await _roleManager.RoleExistsAsync(RoleName);
            if (rolename)
            {
                return "角色已经存在了";
            }
            IdentityRole role = new IdentityRole()
            {
                Name = RoleName,
            };
            var result = await _roleManager.CreateAsync(role);
            if (result.Succeeded)
            {
                return "添加成功";
            }
            else
            {
                return "添加失败";
            }
        }

8.获取所有角色

 /// 

        /// 获取所有角色
        /// 
        /// 
        [HttpGet]
        public List<IdentityRole> GetRoleList()
        {
            return _roleManager.Roles.ToList();
        }

9.给用户分配角色

 /// 

        /// 给用户分配角色
        /// 
        [HttpPost]
        public async Task<string> UserToRole(string userName, string roleName)
        {
            var user = await _userManager.FindByNameAsync(userName);
            if (user != null)
            {
                var IsExist = await _userManager.IsInRoleAsync(user, roleName);
                if (!IsExist)
                {
                    var result = await _userManager.AddToRoleAsync(user, roleName);

                    if (result.Succeeded)
                    {
                        return "分配成功";
                    }
                    else
                    {
                        return "分配失败";
                    }
                }
            }
            return "用户不存在";
        }

10.给角色授权（在program中添加策略）（使用策略）

  builder.Services.AddAuthorization(options =>
            {
                options.AddPolicy("RequireAdminRole", policy =>
                    policy.RequireRole("Admin"));
            });
             app.UseAuthentication();
            app.UseAuthorization();
        //只有登录用户并且管理员才能访问
        [HttpGet]
        [Authorize(Policy = "RequireAdminRole")]
        public string Print()
        {
            return "只有管理员才能访问";
        }

11.给角色授权（使用claim）

  builder.Services.AddAuthorization(options =>
            {
               options.AddPolicy("UserManager", policy =>
                {
                    policy.RequireClaim("用户管理", new string[] { "添加用户", "删除用户", "编辑用户" });
                });
            });
             app.UseAuthentication();
            app.UseAuthorization();

//给用户添加claim声明

          IdentityUser user = new IdentityUser()
            {
                UserName = usename
            };
            if (result.Succeeded)
            {
                await _userManager.AddClaimAsync(user, new Claim("用户管理", "添加用户"));
                return "添加成功";
            }
            return "失败";

   //只有登录用户并且用户claim包含了用户管理才能访问接口
        [HttpGet]
        [Authorize(Policy = "UserManager")]
        public string Print()
        {
            return "只有管理员才能访问";
        }