casbin-node-casbin-prisma-adapter

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casbin-node-casbin-prisma-adapter

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Prisma adapter for Casbin

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# Prisma Adapter

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Prisma Adapter is the [Prisma](https://github.com/prisma/prisma) adapter for [Node-Casbin](https://github.com/casbin/node-casbin). With this library, Node-Casbin can load policy from Prisma supported database or save policy to it.

Based on [Officially Supported Databases](https://www.prisma.io/docs/), the current supported databases are:

- PostgreSQL
- MySQL
- SQLite
- MongoDB

You may find other 3rd-party supported DBs in Prisma website or other places.

## Installation

```
npm install casbin-prisma-adapter --save
```

## Getting Started

Append the following content to your `schema.prisma`:

```prisma
model CasbinRule {
  id    Int     @id @default(autoincrement())
  ptype String
  v0    String?
  v1    String?
  v2    String?
  v3    String?
  v4    String?
  v5    String?

@@map("casbin_rule")
}
```

Create table(MySQL):

```sql
CREATE TABLE IF NOT EXISTS `casbin_rule` (
  `id` int NOT NULL AUTO_INCREMENT,
  `ptype` varchar(255) DEFAULT NULL,
  `v0` varchar(255) DEFAULT NULL,
  `v1` varchar(255) DEFAULT NULL,
  `v2` varchar(255) DEFAULT NULL,
  `v3` varchar(255) DEFAULT NULL,
  `v4` varchar(255) DEFAULT NULL,
  `v5` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
);
```

Here is a simple example:

```ts
import casbin from 'casbin';
import { PrismaAdapter } from 'casbin-prisma-adapter';

async function main() {
  const a = await PrismaAdapter.newAdapter();
  // Or:
  // const prisma = new PrismaClient();
  // const a = await PrismaAdapter.newAdapter(prisma);

const e = await casbin.newEnforcer('examples/rbac_model.conf', a);

// Check the permission.
  e.enforce('alice', 'data1', 'read');

// Modify the policy.
  // await e.addPolicy(...);
  // await e.removePolicy(...);

// Save the policy back to DB.
  await e.savePolicy();
}

main();
```

## Using Custom Prisma Client Output Path (Prisma v7+)

If you're using a custom output path for your Prisma client (e.g., generating the client to `./src/generated/client`), you must pass your PrismaClient instance to the adapter:

```prisma
// schema.prisma
generator client {
  provider = "prisma-client-js"
  output   = "./src/generated/client"
}
```

```ts
import casbin from 'casbin';
import { PrismaAdapter } from 'casbin-prisma-adapter';
import { PrismaClient } from './src/generated/client'; // Your custom path

async function main() {
  const prisma = new PrismaClient();
  const a = await PrismaAdapter.newAdapter(prisma);

const e = await casbin.newEnforcer('examples/rbac_model.conf', a);

// Check the permission.
  e.enforce('alice', 'data1', 'read');

// Save the policy back to DB.
  await e.savePolicy();
}

main();
```

**Important**: When using custom output paths, you must always pass a PrismaClient instance to the adapter. The adapter will attempt to dynamically import from `@prisma/client` only when no instance is provided and the adapter is initialized.

## Getting Help

- [Node-Casbin](https://github.com/casbin/node-casbin)

## License

This project is under Apache 2.0 License. See the [LICENSE](LICENSE) file for the full license text.

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