Go-pg Adapter

Go-pg Adapter is the Go-pg adapter for Casbin. With this library, Casbin can load policy from PostgreSQL or save policy to it.

Installation

go get github.com/casbin/casbin-pg-adapter

Simple Postgres Example

package main

import (
	pgadapter "github.com/casbin/casbin-pg-adapter"
	"github.com/casbin/casbin/v2"
)

func main() {
	// Initialize a Go-pg adapter and use it in a Casbin enforcer:
	// The adapter will use the Postgres database named "casbin".
	// If it doesn't exist, the adapter will create it automatically.
	a, _ := pgadapter.NewAdapter("postgresql://username:password@postgres:5432/database?sslmode=disable") // Your driver and data source.
	// Alternatively, you can construct an adapter instance with *pg.Options:
	// a, _ := pgadapter.NewAdapter(&pg.Options{
	//     Database: "...",
	//     User: "...",
	//     Password: "...",
	// })

	// The adapter will use the table named "casbin_rule".
	// If it doesn't exist, the adapter will create it automatically.

	// Or you can use an existing DB by adding a second string parameter with your database name to the NewAdapter(), like this:
	// a, _ := pgadapter.NewAdapter("postgresql://username:password@postgres:5432/database?sslmode=disable", "your_database_name") 
	
	e := casbin.NewEnforcer("examples/rbac_model.conf", a)

	// 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()
}

Support for FilteredAdapter interface

You can load a subset of policies with this adapter:

package main

import (
	"github.com/casbin/casbin/v2"
	pgadapter "github.com/casbin/casbin-pg-adapter"
)

func main() {
	a, _ := pgadapter.NewAdapter("postgresql://username:password@postgres:5432/database?sslmode=disable")
	e, _ := casbin.NewEnforcer("examples/rbac_model.conf", a)

	e.LoadFilteredPolicy(&pgadapter.Filter{
		P: []string{"", "data1"},
		G: []string{"alice"},
	})
	...
}

Custom DB Connection

You can provide a custom table or database name with pgadapter.NewAdapterByDB

package main

import (
	"github.com/casbin/casbin/v2"
	pgadapter "github.com/casbin/casbin-pg-adapter"
	"github.com/go-pg/pg/v9"
)

func main() {
	opts, _ := pg.ParseURL("postgresql://pguser:pgpassword@localhost:5432/pgdb?sslmode=disable")

	db := pg.Connect(opts)
	defer db.Close()

	a, _ := pgadapter.NewAdapterByDB(db, pgadapter.WithTableName("custom_table"))
	e, _ := casbin.NewEnforcer("examples/rbac_model.conf", a)
    ...
}

Run all tests

docker-compose run --rm go

Debug tests

docker-compose run --rm go dlv test github.com/casbin/casbin-pg-adapter

Getting Help

Casbin

License

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

casbin / casbin-pg-adapter