Get Started

安装

Go

go get github.com/casbin/casbin/v2

Java

对于Maven:

<!-- https://mvnrepository.com/artifact/org.casbin/jcasbin -->
<dependency>
    <groupId>org.casbin</groupId>
    <artifactId>jcasbin</artifactId>
    <version>1.x.y</version>
</dependency>

GraalVM Native Image Support

If you're building a native application with GraalVM (e.g., using Quarkus or Spring Native), jCasbin requires special configuration due to its use of the Aviator expression engine.

By default, Aviator uses dynamic class generation via ASM, which is not supported in GraalVM native images. To resolve this, you must configure Aviator to use interpreter mode instead of compilation mode.

For Quarkus applications:

Add the following to your application.properties or pom.xml:

<properties>
    <quarkus.native.additional-build-args>
        -J-Daviator.eval.mode=INTERPRETER
    </quarkus.native.additional-build-args>
</properties>

For other GraalVM native builds:

Set the system property when building the native image:

-Daviator.eval.mode=INTERPRETER

Or configure it programmatically before initializing jCasbin:

System.setProperty("aviator.eval.mode", "INTERPRETER");

备注

This configuration switches Aviator from its default compilation mode to interpreter mode. While this may have a slight performance impact, it enables full compatibility with GraalVM native images by avoiding runtime class generation.

Node.js

# NPM
npm install casbin --save

# Yarn
yarn add casbin

PHP

在您的项目的composer.json中需要这个包以下载该包:

composer require casbin/casbin

Python

pip install casbin

.NET

dotnet add package Casbin.NET

C++

# Download source
git clone https://github.com/casbin/casbin-cpp.git

# Generate project files
cd casbin-cpp && mkdir build && cd build && cmake .. -DCMAKE_BUILD_TYPE=Release

# Build and install casbin
cmake --build . --config Release --target casbin install -j 10

Rust

cargo install cargo-edit
cargo add casbin

// If you use async-std as async executor
cargo add async-std

// If you use tokio as async executor, make sure you activate its `macros` feature
cargo add tokio

Delphi

Casbin4D以包的形式提供（目前适用于Delphi 10.3 Rio），您可以在IDE中安装它。 然而，没有可视化组件，这意味着您可以独立于包使用单元。 只需在您的项目中导入单元（假设您不介意它们的数量）。

Lua

luarocks install casbin

如果您收到错误消息：“您的用户在/usr/local/lib/luarocks/rocks中没有写权限”，您可能需要以特权用户身份运行命令，或者使用--local的本地树。 要修复错误，您可以在命令后面添加--local，如下所示:

luarocks install casbin --local

新建一个Casbin执行器

Casbin使用配置文件来定义访问控制模型。

有两个配置文件：model.conf和policy.csv。 model.conf存储访问模型，而policy.csv存储具体的用户权限配置。 Casbin的使用非常直接。 我们只需要创建一个主要结构：执行器。 在构建这个结构时，model.conf和policy.csv将被加载。

换句话说，要创建一个Casbin执行器，您需要提供一个模型和一个适配器。

Casbin提供了一个您可以使用的文件适配器。 查看适配器以获取更多信息。

• 使用模型文件和默认的文件适配器的示例：

Go

import "github.com/casbin/casbin/v2"

e, err := casbin.NewEnforcer("path/to/model.conf", "path/to/policy.csv")

Java

import org.casbin.jcasbin.main.Enforcer;

Enforcer e = new Enforcer("path/to/model.conf", "path/to/policy.csv");

Node.js

import { newEnforcer } from 'casbin';

const e = await newEnforcer('path/to/model.conf', 'path/to/policy.csv');

PHP

require_once './vendor/autoload.php';

use Casbin\Enforcer;

$e = new Enforcer("path/to/model.conf", "path/to/policy.csv");

Python

import casbin

e = casbin.Enforcer("path/to/model.conf", "path/to/policy.csv")

.NET

using NetCasbin;

var e = new Enforcer("path/to/model.conf", "path/to/policy.csv");

C++

#include <iostream>
#include <casbin/casbin.h>

int main() {
    // Create an Enforcer
    casbin::Enforcer e("path/to/model.conf", "path/to/policy.csv");

    // your code ..
}

Delphi

var
  casbin: ICasbin;
begin
  casbin := TCasbin.Create('path/to/model.conf', 'path/to/policy.csv');
  ...
end

Rust

use casbin::prelude::*;

// If you use async_td as async executor
#[cfg(feature = "runtime-async-std")]
#[async_std::main]
async fn main() -> Result<()> {
    let mut e = Enforcer::new("path/to/model.conf", "path/to/policy.csv").await?;
    Ok(())
}

// If you use tokio as async executor
#[cfg(feature = "runtime-tokio")]
#[tokio::main]
async fn main() -> Result<()> {
    let mut e = Enforcer::new("path/to/model.conf", "path/to/policy.csv").await?;
    Ok(())
}

Lua

local Enforcer = require("casbin")
local e = Enforcer:new("path/to/model.conf", "path/to/policy.csv") -- The Casbin Enforcer

• 使用模型文本和其他适配器：

Go

import (
    "log"

    "github.com/casbin/casbin/v2"
    "github.com/casbin/casbin/v2/model"
    xormadapter "github.com/casbin/xorm-adapter/v2"
    _ "github.com/go-sql-driver/mysql"
)

// Initialize a Xorm adapter with MySQL database.
a, err := xormadapter.NewAdapter("mysql", "mysql_username:mysql_password@tcp(127.0.0.1:3306)/")
if err != nil {
    log.Fatalf("error: adapter: %s", err)
}

m, err := model.NewModelFromString(`
[request_definition]
r = sub, obj, act

[policy_definition]
p = sub, obj, act

[policy_effect]
e = some(where (p.eft == allow))

[matchers]
m = r.sub == p.sub && r.obj == p.obj && r.act == p.act
`)
if err != nil {
    log.Fatalf("error: model: %s", err)
}

e, err := casbin.NewEnforcer(m, a)
if err != nil {
    log.Fatalf("error: enforcer: %s", err)
}

Python

import casbin
import casbin_sqlalchemy_adapter


# Use SQLAlchemy Casbin adapter with SQLLite DB
adapter = casbin_sqlalchemy_adapter.Adapter('sqlite:///test.db')

# Create a config model policy
with open("rbac_example_model.conf", "w") as f:
    f.write("""
    [request_definition]
    r = sub, obj, act

    [policy_definition]
    p = sub, obj, act

    [policy_effect]
    e = some(where (p.eft == allow))

    [matchers]
    m = r.sub == p.sub && r.obj == p.obj && r.act == p.act
    """)

# Create enforcer from adapter and config policy
e = casbin.Enforcer('rbac_example_model.conf', adapter)

检查权限

在访问发生之前，在您的代码中添加一个执行钩子：

Go

sub := "alice" // the user that wants to access a resource.
obj := "data1" // the resource that is going to be accessed.
act := "read" // the operation that the user performs on the resource.

ok, err := e.Enforce(sub, obj, act)

if err != nil {
    // handle err
}

if ok == true {
    // permit alice to read data1
} else {
    // deny the request, show an error
}

// You could use BatchEnforce() to enforce some requests in batches.
// This method returns a bool slice, and this slice's index corresponds to the row index of the two-dimensional array.
// e.g. results[0] is the result of {"alice", "data1", "read"}
results, err := e.BatchEnforce([][]interface{}{{"alice", "data1", "read"}, {"bob", "data2", "write"}, {"jack", "data3", "read"}})

Java

String sub = "alice"; // the user that wants to access a resource.
String obj = "data1"; // the resource that is going to be accessed.
String act = "read"; // the operation that the user performs on the resource.

if (e.enforce(sub, obj, act) == true) {
    // permit alice to read data1
} else {
    // deny the request, show an error
}

GraalVM Native Image Note

If you're running jCasbin in a GraalVM native image environment, make sure you've configured Aviator to use interpreter mode as described in the installation section above. Without this configuration, you'll encounter an UnsupportedFeatureError due to runtime class generation attempts.

Node.js

const sub = 'alice'; // the user that wants to access a resource.
const obj = 'data1'; // the resource that is going to be accessed.
const act = 'read'; // the operation that the user performs on the resource.

if ((await e.enforce(sub, obj, act)) === true) {
    // permit alice to read data1
} else {
    // deny the request, show an error
}

PHP

$sub = "alice"; // the user that wants to access a resource.
$obj = "data1"; // the resource that is going to be accessed.
$act = "read"; // the operation that the user performs on the resource.

if ($e->enforce($sub, $obj, $act) === true) {
    // permit alice to read data1
} else {
    // deny the request, show an error
}

Python

sub = "alice"  # the user that wants to access a resource.
obj = "data1"  # the resource that is going to be accessed.
act = "read"  # the operation that the user performs on the resource.

if e.enforce(sub, obj, act):
    # permit alice to read data1
    pass
else:
    # deny the request, show an error
    pass

.NET

var sub = "alice";  # the user that wants to access a resource.
var obj = "data1";  # the resource that is going to be accessed.
var act = "read";  # the operation that the user performs on the resource.

if (await e.EnforceAsync(sub, obj, act))
{
    // permit alice to read data1
}
else
{
    // deny the request, show an error
}

C++

    casbin::Enforcer e("../assets/model.conf", "../assets/policy.csv");

    if (e.Enforce({"alice", "/alice_data/hello", "GET"})) {
        std::cout << "Enforce OK" << std::endl;
    } else {
        std::cout << "Enforce NOT Good" << std::endl;
    }

    if (e.Enforce({"alice", "/alice_data/hello", "POST"})) {
        std::cout << "Enforce OK" << std::endl;
    } else {
        std::cout << "Enforce NOT Good" << std::endl;
    }

Delphi

if casbin.enforce(['alice,data1,read']) then
  // Alice is super happy as she can read data1
else
  // Alice is sad

Rust

  let sub = "alice"; // the user that wants to access a resource.
  let obj = "data1"; // the resource that is going to be accessed.
  let act = "read"; // the operation that the user performs on the resource.

  if e.enforce((sub, obj, act)).await? {
      // permit alice to read data1
  } else {
      // error occurs
  }

Lua

if e:enforce("alice", "data1", "read") then
   -- permit alice to read data1
else
   -- deny the request, show an error
end

Casbin还提供了运行时权限管理的API。 例如，您可以如下获取分配给用户的所有角色：

Go

roles, err := e.GetRolesForUser("alice")

Java

List<String> roles = e.getRolesForUser("alice");

Node.js

const roles = await e.getRolesForUser('alice');

PHP

$roles = $e->getRolesForUser("alice");

Python

roles = e.get_roles_for_user("alice")

.NET

var roles = e.GetRolesForUser("alice");

Delphi

roles = e.rolesForEntity("alice")

Rust

let roles = e.get_roles_for_user("alice");

Lua

local roles = e:GetRolesForUser("alice")

查看管理API和RBAC API以获取更多用法。

请参考测试用例以获取更多用法。