How to implement multi-tenancy and permission control functions through the Webman framework?

How to implement multi-tenancy and permission control functions through the Webman framework?

Introduction:
In today's Internet era, many enterprises are facing a common problem: How to manage the access rights of multiple tenants in one system? The Webman framework provides a convenient and flexible solution. This article will use actual code examples to introduce how to implement multi-tenancy and permission control functions through the Webman framework.

1. Introduction to Webman Framework
The Webman framework is a lightweight Web framework developed based on Java. It provides a simple and flexible development environment that can help developers quickly build Web applications. Compared with other frameworks, the Webman framework is unique in that it has built-in multi-tenancy and permission control functions, making the development of multi-tenant applications more convenient.

2. Configure multi-tenancy
In the Webman framework, each tenant corresponds to an independent database. In order to realize the multi-tenant function, we need to add tenant-related information in the configuration file. For example, we can add the following configuration items in the configuration file:

webman.tenant.enable=true
webman.tenant.database.driver=com.mysql.cj.jdbc.Driver
webman.tenant.database.url=jdbc:mysql://localhost:3306/tenant_db_%{tenantId}
webman.tenant.database.username=root
webman.tenant.database.password=

Among them, webman.tenant.enable is used to enable multi-tenant functionality, webman.tenant.database.url Specifies the database connection information corresponding to each tenant, %{tenantId} indicates the tenant ID of the current request.

3. Implement permission control
The Webman framework implements permission control functions through interceptors. We can define an interceptor class inherited from WebmanInterceptor and implement the preHandle() method to perform permission verification in this method. The following is an example:

public class PermissionInterceptor extends WebmanInterceptor {
    @Override
    public boolean preHandle(WebmanRequest request, WebmanResponse response, Object handler) throws Exception {
        String tenantId = request.getParameter("tenantId");
        if (StringUtils.isEmpty(tenantId)) {
            response.setStatus(HttpStatus.UNAUTHORIZED);
            response.getWriter().write("Missing tenantId parameter");
            return false;
        }

        // 在这里进行权限验证的业务逻辑

        return true;
    }
}

In the above example, we perform permission verification by getting the tenantId in the request parameter. If the verification fails, we can set the corresponding HTTP status code and return error message.

4. Using multi-tenancy and permission control functions
In the Webman framework, we can declare the tenant and access permissions of the controller through annotations. The following is an example:

@Controller
@Tenant("tenant1")
public class UserController {
    @GetMapping("/user")
    @Permit("read")
    public String getUser() {
        // 这里是获取用户信息的业务逻辑
        return "user";
    }

    @PostMapping("/user")
    @Permit("write")
    public String saveUser() {
        // 这里是保存用户信息的业务逻辑
        return "redirect:/user";
    }
}

In the above example, we specify the tenant to which the controller belongs through the @Tenant annotation and the @Permit annotation. method access rights. When a request reaches the controller, the Webman framework performs permission verification based on the requested tenant ID and permission information.

Conclusion:
Through the multi-tenant and permission control functions provided by the Webman framework, we can easily realize the development of multi-tenant applications. By configuring multi-tenancy and using interceptors for permission verification, we can ensure that each tenant can only access the resources for which it has permission. I hope the sample code in this article can help readers better understand and apply the multi-tenancy and permission control functions of the Webman framework.

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