conscious-sapphire•5mo ago

casbin with refine

im trying to make an accessControlProvider with casbin following to refine's tutorial, but when i npm start, i get following error: Identifier 'Buffer' has already been declared (at casbin.js?v=248064cd:6:3) i have configured polyfills for vite as following: import react from "@vitejs/plugin-react"; import { defineConfig } from "vite"; import { NodeGlobalsPolyfillPlugin } from "@esbuild-plugins/node-globals-polyfill"; import { NodeModulesPolyfillPlugin } from "@esbuild-plugins/node-modules-polyfill"; import rollupNodePolyFill from "rollup-plugin-polyfill-node"; export default defineConfig({ plugins: [react()], server: { open: true, host: true, }, optimizeDeps: { esbuildOptions: { // Node.js global to browser globalThis define: { global: "globalThis", }, plugins: [ NodeGlobalsPolyfillPlugin({ buffer: true, process: true, }), NodeModulesPolyfillPlugin(), ], }, }, build: { rollupOptions: { plugins: [rollupNodePolyFill()], }, }, }); but it didn't work

9 Replies

kapa.ai•5mo ago

Hi @Belvis. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- It seems like you have followed the correct steps to configure polyfills for vite to work in a browser environment. However, the error you're encountering suggests that there might be a conflict with the declaration of 'Buffer'. The polyfill configuration you've provided seems to be correct according to the Refine's tutorial (https://refine.dev/blog/refine-pixels-6#casbin-installation). Here is the configuration provided in the tutorial:

import { defineConfig } from "vite";  
import react from "@vitejs/plugin-react";  
  
import { NodeGlobalsPolyfillPlugin } from "@esbuild-plugins/node-globals-polyfill";  
import { NodeModulesPolyfillPlugin } from "@esbuild-plugins/node-modules-polyfill";  
import rollupNodePolyFill from "rollup-plugin-polyfill-node";  
  
export default defineConfig({  
 plugins: [react()],  
 optimizeDeps: {  
 esbuildOptions: {  
 // Node.js global to browser globalThis  
 define: {  
 global: "globalThis",  
 },  
 // Enable esbuild polyfill plugins  
 plugins: [  
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment  
 // @ts-ignore  
 NodeGlobalsPolyfillPlugin({  
 buffer: true,  
 process: true,  
 }),  
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment  
 // @ts-ignore  
 NodeModulesPolyfillPlugin(),  
 ],  
 },  
 },  
 build: {  
 rollupOptions: {  
 plugins: [rollupNodePolyFill()],  
 },  
 },  
});

import { defineConfig } from "vite";  
import react from "@vitejs/plugin-react";  
  
import { NodeGlobalsPolyfillPlugin } from "@esbuild-plugins/node-globals-polyfill";  
import { NodeModulesPolyfillPlugin } from "@esbuild-plugins/node-modules-polyfill";  
import rollupNodePolyFill from "rollup-plugin-polyfill-node";  
  
export default defineConfig({  
 plugins: [react()],  
 optimizeDeps: {  
 esbuildOptions: {  
 // Node.js global to browser globalThis  
 define: {  
 global: "globalThis",  
 },  
 // Enable esbuild polyfill plugins  
 plugins: [  
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment  
 // @ts-ignore  
 NodeGlobalsPolyfillPlugin({  
 buffer: true,  
 process: true,  
 }),  
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment  
 // @ts-ignore  
 NodeModulesPolyfillPlugin(),  
 ],  
 },  
 },  
 build: {  
 rollupOptions: {  
 plugins: [rollupNodePolyFill()],  
 },  
 },  
});

If you've followed these steps correctly and are still encountering the issue, it might be due to some other part of your code or a package conflict. You might want to check if 'Buffer' is being declared elsewhere in your code or in any other packages you're using. If the issue persists, consider reaching out to the Refine community on their Discord server (https://discord.gg/refine) for more specific help. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•5mo ago

<@353701348463738885> kapa.ai is still learning and improving, please let us know how it did by reacting below

conscious-sapphire•5mo ago

gosh T_T @kapa.ai still getting Identifier 'Buffer' has already been declared (at casbin.js?v=cfcfbe07:6:3), i don't know why

kapa.ai•5mo ago

Let me check the knowledge base for you. One moment! :books: ---------------------- I'm sorry to hear that you're still encountering the issue. The error message "Identifier 'Buffer' has already been declared" typically means that the 'Buffer' object is being declared more than once in your code. However, without more specific information about your project setup, it's difficult to provide a precise solution. Here are a few general suggestions: 1. Check your entire project for any other instances where 'Buffer' might be declared. This includes your own code as well as any third-party libraries or packages you're using. 2. Make sure you're using the latest versions of your dependencies. Sometimes, issues like this can be caused by bugs in older versions of packages. 3. Try to isolate the issue by commenting out parts of your code or disabling packages one by one to see if the error persists. This can help you identify the exact source of the problem. If none of these suggestions help, I recommend reaching out to the Refine community on their Discord server (https://discord.gg/refine) or creating an issue on the Refine GitHub repository (https://github.com/pankod/refine/issues). They might be able to provide more specific assistance based on their experience with similar issues. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•5mo ago

<@353701348463738885> kapa.ai is still learning and improving, please let us know how it did by reacting below

conscious-sapphire•5mo ago

@kapa.ai is there any way else that i can achieve it without casbin?

kapa.ai•5mo ago

Let me check the knowledge base for you. One moment! :books: ---------------------- Yes, you can implement access control in Refine without using Casbin. Refine is deliberately agnostic for its own API to be able to integrate different methods (RBAC, ABAC, ACL, etc.) and different libraries (Casbin (https://casbin.org/), CASL (https://casl.js.org/v5/en/), Cerbos (https://cerbos.dev/), AccessControl.js (https://onury.io/accesscontrol/)). The accessControlProvider interface in Refine allows you to implement the can function however you want. You can achieve this by adding custom properties to your auth tables or link users with some other tables to make access control work resource based. It depends on how you want to make the implementation actually. Here is an example of how you can implement the can method for accessControlProvider:

<Refine  
 accessControlProvider={{  
 can: async ({ resource, action }) => {  
   // Your custom access control logic here
   // Return { can: true } if access is granted, { can: false } otherwise
 },  
 }}  
 //...  
 >  
 {/* ... */}  
 </Refine>

<Refine  
 accessControlProvider={{  
 can: async ({ resource, action }) => {  
   // Your custom access control logic here
   // Return { can: true } if access is granted, { can: false } otherwise
 },  
 }}  
 //...  
 >  
 {/* ... */}  
 </Refine>

In this function, you can implement your own logic to check if the current user has the necessary permissions to perform the specified action on the specified resource. For more information, you can refer to the Refine documentation on access control (https://refine.dev/docs/advanced-tutorials/access-control#introduction). ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•5mo ago

<@353701348463738885> kapa.ai is still learning and improving, please let us know how it did by reacting below

conscious-sapphire•4mo ago

update: somehow i made it work with this npm add node-stdlib-browser npm add -D vite-plugin-node-stdlib-browser // vite.config.js import { defineConfig } from 'vite' import nodePolyfills from 'vite-plugin-node-stdlib-browser' export default defineConfig({ // other options plugins: [nodePolyfills()] })