Get Started

Установка

Go

go get github.com/casbin/casbin/v2

Java

Для 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");

заметка

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

Требуется этот пакет в composer.json вашего проекта для загрузки пакета:

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 поставляется в пакете (в настоящее время для Delphi 10.3 Rio), и вы можете установить его в IDE. Однако визуальных компонентов нет, что означает, что вы можете использовать модули независимо от пакетов. Просто импортируйте модули в свой проект (предполагая, что вам не важно их количество).

Lua

luarocks install casbin

Если вы получаете сообщение об ошибке: "У вашего пользователя нет прав на запись в /usr/local/lib/luarocks/rocks", вы можете захотеть запустить команду от имени привилегированного пользователя или использовать свое локальное дерево с --local. Чтобы исправить ошибку, вы можете добавить --local за вашей командой, как это:

luarocks install casbin --local

Создать новый Casbin enforcer

Casbin использует файлы конфигурации для определения модели контроля доступа.

Есть два файла конфигурации: model.conf и policy.csv. model.conf хранит модель доступа, в то время как policy.csv хранит конкретную конфигурацию разрешений пользователя. Использование Casbin очень простое. Нам нужно создать только одну основную структуру: enforcer. При создании этой структуры будут загружены model.conf и policy.csv.

Другими словами, чтобы создать Casbin enforcer, вам нужно предоставить Model и Adapter.

Casbin предоставляет FileAdapter, который вы можете использовать. Смотрите Adapter для получения дополнительной информации.

• Пример использования файла Model и стандартного FileAdapter:

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

• Используйте текст Model с другим Adapter:

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)

Проверка разрешений

Добавьте крючок для принуждения в свой код прямо перед тем, как происходит доступ:

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 также предоставляет API для управления разрешениями в реальном времени. Например, вы можете получить все роли, назначенные пользователю, как показано ниже:

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")

Смотрите Management API и RBAC API для получения дополнительной информации.

Пожалуйста, обратитесь к тестовым случаям для получения дополнительной информации.