十、Abp vNext 基础篇丨权限
时间：2022-09-23
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本文梯子
正文
介绍
本章节来把接口的权限加一下
权限配置和使用
官方地址：https://docs.abp.io/en/abp/latest/Authorization
下面这种代码可能我们日常开发都写过,ASP.NET Core 提供的Authorize特性来帮我们做授权，但是BookStore_Author_Create策略，需要我们去手动声明。
Abp定义了一个叫Permission System叫权限系统啥的都可以，来帮助我们轻松的搞定授权,具体怎么玩看下面代码就三部。
一、定义常量
public static >CorePermissions
{
public const string GroupName = "Bvcp.Core";
public static >Blogs
{
public const string Default = GroupName + ".Blog";
public const string Management = Default + ".Management";
public const string Delete = Default + ".Delete";
public const string Update = Default + ".Update";
public const string Create = Default + ".Create";
public const string ClearCache = Default + ".ClearCache";
}
public static >Posts
{
public const string Default = GroupName + ".Post";
public const string Delete = Default + ".Delete";
public const string Update = Default + ".Update";
public const string Create = Default + ".Create";
}
public static >Tags
{
public const string Default = GroupName + ".Tag";
public const string Delete = Default + ".Delete";
public const string Update = Default + ".Update";
public const string Create = Default + ".Create";
}
public static >Comments
{
public const string Default = GroupName + ".Comment";
public const string Delete = Default + ".Delete";
public const string Update = Default + ".Update";
public const string Create = Default + ".Create";
}
public static string[] GetAll()
{
return ReflectionHelper.GetPublicConstantsRecursively(typeof(CorePermissions));
}
}
二、添加权限配置
public >CorePermissionDefinitionProvider : PermissionDefinitionProvider
{
public override void Define(IPermissionDefinitionContext context)
{
var bloggingGroup = context.AddGroup(CorePermissions.GroupName, L("Permission:Core"));
var blogs = bloggingGroup.AddPermission(CorePermissions.Blogs.Default, L("Permission:Blogs"));
blogs.AddChild(CorePermissions.Blogs.Management, L("Permission:Management"));
blogs.AddChild(CorePermissions.Blogs.Update, L("Permission:Edit"));
blogs.AddChild(CorePermissions.Blogs.Delete, L("Permission:Delete"));
blogs.AddChild(CorePermissions.Blogs.Create, L("Permission:Create"));
blogs.AddChild(CorePermissions.Blogs.ClearCache, L("Permission:ClearCache"));
var posts = bloggingGroup.AddPermission(CorePermissions.Posts.Default, L("Permission:Posts"));
posts.AddChild(CorePermissions.Posts.Update, L("Permission:Edit"));
posts.AddChild(CorePermissions.Posts.Delete, L("Permission:Delete"));
posts.AddChild(CorePermissions.Posts.Create, L("Permission:Create"));
var tags = bloggingGroup.AddPermission(CorePermissions.Tags.Default, L("Permission:Tags"));
tags.AddChild(CorePermissions.Tags.Update, L("Permission:Edit"));
tags.AddChild(CorePermissions.Tags.Delete, L("Permission:Delete"));
tags.AddChild(CorePermissions.Tags.Create, L("Permission:Create"));
var comments = bloggingGroup.AddPermission(CorePermissions.Comments.Default, L("Permission:Comments"));
comments.AddChild(CorePermissions.Comments.Update, L("Permission:Edit"));
comments.AddChild(CorePermissions.Comments.Delete, L("Permission:Delete"));
comments.AddChild(CorePermissions.Comments.Create, L("Permission:Create"));
}
private static LocalizableString L(string name)
{
return LocalizableString.Create<CoreResource>(name);
}
}
三、使用
Authorize(CorePermissions.Posts.Delete)]
资源授权方案
资源授权可能用过的人不多，代码都会在整体的修改代码一节这里先看就行，可以参考微软官方文档
https://docs.microsoft.com/zh-cn/aspnet/core/security/authorization/resourcebased?view=aspnetcore-5.0
有些场景下，授权需要依赖于要访问的资源，例如：每个资源通常会有一个创建者属性，我们只允许该资源的创建者才可以对其进行编辑，删除等操作，这就无法通过[Authorize]特性来指定授权了。因为授权过滤器会在我们的应用代码之前执行，无法确定所访问的资源。此时，我们需要使用基于资源的授权，下面就来演示一下具体是如何操作的。
定义资源Requirement
在基于资源的授权中，我们要判断的是用户是否具有针对该资源的某项操作，因此，我们先定义一个代表操作的Requirement：
public static >CommonOperations
{
public static OperationAuthorizationRequirement Update = new OperationAuthorizationRequirement { Name = nameof(Update) };
public static OperationAuthorizationRequirement Delete = new OperationAuthorizationRequirement { Name = nameof(Delete) };
}
实现资源授权Handler
每一个 Requirement 都需要有一个对应的 Handler，来完成授权逻辑，可以直接让 Requirement 实现IAuthorizationHandler接口。
我们是根据资源的创建者来判断用户是否具有操作权限，实现我们的授权Handler:
public >CommentAuthorizationHandler : AuthorizationHandler<OperationAuthorizationRequirement, Comment>
{
private readonly IPermissionChecker _permissionChecker;
public CommentAuthorizationHandler(IPermissionChecker permissionChecker)
{
_permissionChecker = permissionChecker;
}
protected override async Task HandleRequirementAsync(
AuthorizationHandlerContext context,
OperationAuthorizationRequirement requirement,
Comment resource)
{
if (requirement.Name == CommonOperations.Delete.Name && await HasDeletePermission(context, resource))
{
context.Succeed(requirement);
return;
}
if (requirement.Name == CommonOperations.Update.Name && await HasUpdatePermission(context, resource))
{
context.Succeed(requirement);
return;
}
}
private async Task<bool> HasDeletePermission(AuthorizationHandlerContext context, Comment resource)
{
// 判断创建人是否是登陆人
if (resource.CreatorId != null && resource.CreatorId == context.User.FindUserId())
{
return true;
}
// 判断当前用户是否满足资源操作策略
if (await _permissionChecker.IsGrantedAsync(context.User, CorePermissions.Comments.Delete))
{
return true;
}
return false;
}
private async Task<bool> HasUpdatePermission(AuthorizationHandlerContext context, Comment resource)
{
// 判断创建人是否是登陆人
if (resource.CreatorId != null && resource.CreatorId == context.User.FindUserId())
{
return true;
}
// 判断当前用户是否满足资源操作策略
if (await _permissionChecker.IsGrantedAsync(context.User, CorePermissions.Comments.Update))
{
return true;
}
return false;
}
}
注册Handler，这一点不要忘了
public >CoreApplicationModule : AbpModule
{
public override void ConpServices(ServiceConfigurationContext context)
{
Conp<AbpAutoMapperOptions>(options =>
{
options.AddMaps<CoreApplicationModule>();
});
Conp<AuthorizationOptions>(options =>
{
options.AddPolicy("BloggingUpdatePolicy", policy => policy.Requirements.Add(CommonOperations.Update));
options.AddPolicy("BloggingDeletePolicy", policy => policy.Requirements.Add(CommonOperations.Delete));
});
context.Services.AddSingleton<IAuthorizationHandler, CommentAuthorizationHandler>();
context.Services.AddSingleton<IAuthorizationHandler, PostAuthorizationHandler>();
}
}
使用策略授权
[Authorize]
public async Task<CommentWithDetailsDto> UpdateAsync(Guid id, UpdateCommentDto input)
{
var comment = await _commentRepository.GetAsync(id);
// 检测是否有权限
await AuthorizationService.CheckAsync(comment, CommonOperations.Update);
comment.SetText(input.Text);
comment = await _commentRepository.UpdateAsync(comment);
return ObjectMapper.Map<Comment, CommentWithDetailsDto>(comment);
}
整体的修改代码
public static >CommonOperations
{
public static OperationAuthorizationRequirement Update = new OperationAuthorizationRequirement { Name = nameof(Update) };
public static OperationAuthorizationRequirement Delete = new OperationAuthorizationRequirement { Name = nameof(Delete) };
}
public >CommentAuthorizationHandler : AuthorizationHandler<OperationAuthorizationRequirement, Comment>
{
private readonly IPermissionChecker _permissionChecker;
public CommentAuthorizationHandler(IPermissionChecker permissionChecker)
{
_permissionChecker = permissionChecker;
}
protected override async Task HandleRequirementAsync(
AuthorizationHandlerContext context,
OperationAuthorizationRequirement requirement,
Comment resource)
{
if (requirement.Name == CommonOperations.Delete.Name && await HasDeletePermission(context, resource))
{
context.Succeed(requirement);
return;
}
if (requirement.Name == CommonOperations.Update.Name && await HasUpdatePermission(context, resource))
{
context.Succeed(requirement);
return;
}
}
private async Task<bool> HasDeletePermission(AuthorizationHandlerContext context, Comment resource)
{
if (resource.CreatorId != null && resource.CreatorId == context.User.FindUserId())
{
return true;
}
if (await _permissionChecker.IsGrantedAsync(context.User, CorePermissions.Comments.Delete))
{
return true;
}
return false;
}
private async Task<bool> HasUpdatePermission(AuthorizationHandlerContext context, Comment resource)
{
if (resource.CreatorId != null && resource.CreatorId == context.User.FindUserId())
{
return true;
}
if (await _permissionChecker.IsGrantedAsync(context.User, CorePermissions.Comments.Update))
{
return true;
}
return false;
}
}
public >PostAuthorizationHandler : AuthorizationHandler<OperationAuthorizationRequirement, Post>
{
private readonly IPermissionChecker _permissionChecker;
public PostAuthorizationHandler(IPermissionChecker permissionChecker)
{
_permissionChecker = permissionChecker;
}
protected override async Task HandleRequirementAsync(AuthorizationHandlerContext context, OperationAuthorizationRequirement requirement,
Post resource)
{
if (requirement.Name == CommonOperations.Delete.Name && await HasDeletePermission(context, resource))
{
context.Succeed(requirement);
return;
}
if (requirement.Name == CommonOperations.Update.Name && await HasUpdatePermission(context, resource))
{
context.Succeed(requirement);
return;
}
}
private async Task<bool> HasDeletePermission(AuthorizationHandlerContext context, Post resource)
{
if (resource.CreatorId != null && resource.CreatorId == context.User.FindUserId())
{
return true;
}
if (await _permissionChecker.IsGrantedAsync(context.User, CorePermissions.Posts.Delete))
{
return true;
}
return false;
}
private async Task<bool> HasUpdatePermission(AuthorizationHandlerContext context, Post resource)
{
if (resource.CreatorId != null && resource.CreatorId == context.User.FindUserId())
{
return true;
}
if (await _permissionChecker.IsGrantedAsync(context.User, CorePermissions.Posts.Update))
{
return true;
}
return false;
}
}
CoreApplicationModule.cs
public >CoreApplicationModule : AbpModule
{
public override void ConpServices(ServiceConfigurationContext context)
{
Conp<AbpAutoMapperOptions>(options =>
{
options.AddMaps<CoreApplicationModule>();
});
// 注册
Conp<AuthorizationOptions>(options =>
{
options.AddPolicy("BloggingUpdatePolicy", policy => policy.Requirements.Add(CommonOperations.Update));
options.AddPolicy("BloggingDeletePolicy", policy => policy.Requirements.Add(CommonOperations.Delete));
});
context.Services.AddSingleton<IAuthorizationHandler, CommentAuthorizationHandler>();
context.Services.AddSingleton<IAuthorizationHandler, PostAuthorizationHandler>();
}
}
CommentAppService.cs
[Authorize]
public async Task<CommentWithDetailsDto> UpdateAsync(Guid id, UpdateCommentDto input)
{
var comment = await _commentRepository.GetAsync(id);
await AuthorizationService.CheckAsync(comment, CommonOperations.Update);
comment.SetText(input.Text);
comment = await _commentRepository.UpdateAsync(comment);
return ObjectMapper.Map<Comment, CommentWithDetailsDto>(comment);
}
[Authorize]
public async Task DeleteAsync(Guid id)
{
var comment = await _commentRepository.GetAsync(id);
await AuthorizationService.CheckAsync(comment, CommonOperations.Delete);
var replies = await _commentRepository.GetRepliesOfComment(id);
foreach (var reply in replies)
{
await _commentRepository.DeleteAsync(reply.Id);
}
}
PostAppService.cs
[Authorize(CorePermissions.Posts.Delete)]
public async Task DeleteAsync(Guid id)
{
// 查找文章
var post = await _postRepository.GetAsync(id);
// 判断是否有资源操作权
await AuthorizationService.CheckAsync(post, CommonOperations.Delete);
// 根据文章获取Tags
var tags = await GetTagsOfPost(id);
// 减少Tag引用数量
await _tagRepository.DecreaseUsageCountOfTagsAsync(tags.Select(t => t.Id).ToList());
// 删除评论
await _commentRepository.DeleteOfPost(id);
// 删除文章
await _postRepository.DeleteAsync(id);
await PublishPostChangedEventAsync(post.BlogId);
}
[Authorize(CorePermissions.Posts.Update)]
public async Task<PostWithDetailsDto> UpdateAsync(Guid id, UpdatePostDto input)
{
var post = await _postRepository.GetAsync(id);
input.Url = await RenameUrlIfItAlreadyExistAsync(input.BlogId, input.Url, post);
await AuthorizationService.CheckAsync(post, CommonOperations.Update);
post.SetTitle(input.Title);
post.SetUrl(input.Url);
post.Content = input.Content;
post.Description = input.Description;
post.CoverImage = input.CoverImage;
post = await _postRepository.UpdateAsync(post);
var tagList = SplitTags(input.Tags);
await SaveTags(tagList, post);
await PublishPostChangedEventAsync(post.BlogId);
return ObjectMapper.Map<Post, PostWithDetailsDto>(post);
}
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