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casbin-mongodb-adapter

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MongoDB adapter for Casbin

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MongoDB Adapter
====

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MongoDB Adapter is the [Mongo DB](https://www.mongodb.com) adapter for [Casbin](https://github.com/casbin/casbin). With this library, Casbin can load policy from MongoDB or save policy to it.

## Installation

go get -u github.com/apache/casbin-mongodb-adapter/v4

## Simple Example

```go
package main

import (
	"github.com/casbin/casbin/v3"
	"github.com/apache/casbin-mongodb-adapter/v4"
)

func main() {
	// Initialize a MongoDB adapter and use it in a Casbin enforcer:
	// The adapter will use the database named "casbin".
	// If it doesn't exist, the adapter will create it automatically.
	a,err := mongodbadapter.NewAdapter("127.0.0.1:27017") // Your MongoDB URL. 
	if err != nil {
		panic(err)
	}
	// Or you can use an existing DB "abc" like this:
	// The adapter will use the table named "casbin_rule".
	// If it doesn't exist, the adapter will create it automatically.
	// a := mongodbadapter.NewAdapter("127.0.0.1:27017/abc")

e, err := casbin.NewEnforcer("examples/rbac_model.conf", a)
	if err != nil {
		panic(err)
	}

// Load the policy from DB.
	e.LoadPolicy()
	
	// Check the permission.
	e.Enforce("alice", "data1", "read")
	
	// Modify the policy.
	// e.AddPolicy(...)
	// e.RemovePolicy(...)
	
	// Save the policy back to DB.
	e.SavePolicy()
}
```
## Advanced Example

```go
package main

import (
	"github.com/casbin/casbin/v3"
	"github.com/apache/casbin-mongodb-adapter/v4"
	mongooptions "go.mongodb.org/mongo-driver/mongo/options"
)

func main() {
	// Initialize a MongoDB adapter with NewAdapterWithClientOption:
	// The adapter will use custom mongo client options.
	// custom database name.
	// default collection name 'casbin_rule'.
	mongoClientOption := mongooptions.Client().ApplyURI("mongodb://127.0.0.1:27017")
	databaseName := "casbin"
	a,err := mongodbadapter.NewAdapterWithClientOption(mongoClientOption, databaseName)
	// Or you can use NewAdapterWithCollectionName for custom collection name.
	if err != nil {
		panic(err)
	}

e, err := casbin.NewEnforcer("examples/rbac_model.conf", a)
	if err != nil {
		panic(err)
	}

## Filtered Policies

```go
import "github.com/globalsign/mgo/bson"

// This adapter also implements the FilteredAdapter interface. This allows for
// efficent, scalable enforcement of very large policies:
filter := &bson.M{"v0": "alice"}
e.LoadFilteredPolicy(filter)

// The loaded policy is now a subset of the policy in storage, containing only
// the policy lines that match the provided filter. This filter should be a
// valid MongoDB selector using BSON. A filtered policy cannot be saved.
```

## Getting Help

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

## License

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

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