gormadapter

README

Gorm Adapter

Gorm Adapter is the Gorm adapter for Casbin. With this library, Casbin can load policy from Gorm supported database or save policy to it.

Based on Officially Supported Databases, The current supported databases are:

• MySQL
• PostgreSQL
• Sqlite3
• SQL Server

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

Installation

go get github.com/casbin/gorm-adapter/v3

Simple Example

package main

import (
	"github.com/casbin/casbin/v2"
	gormadapter "github.com/casbin/gorm-adapter/v3"
	_ "github.com/go-sql-driver/mysql"
)

func main() {
	// Initialize a Gorm adapter and use it in a Casbin enforcer:
	// The adapter will use the MySQL database named "casbin".
	// If it doesn't exist, the adapter will create it automatically.
	// You can also use an already existing gorm instance with gormadapter.NewAdapterByDB(gormInstance)
	a, _ := gormadapter.NewAdapter("mysql", "mysql_username:mysql_password@tcp(127.0.0.1:3306)/") // Your driver and data source.
	e, _ := casbin.NewEnforcer("examples/rbac_model.conf", a)
	
	// 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 := gormadapter.NewAdapter("mysql", "mysql_username:mysql_password@tcp(127.0.0.1:3306)/abc", true)

	// 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()
}

Customize table columns example

You can change the gorm struct tags, but the table structure must stay the same.

package main

import (
	"github.com/casbin/casbin/v2"
	gormadapter "github.com/casbin/gorm-adapter/v3"
	"gorm.io/gorm"
)

func main() {
	// Increase the column size to 512.
	type CasbinRule struct {
		ID    uint   `gorm:"primaryKey;autoIncrement"`
		Ptype string `gorm:"size:512;uniqueIndex:unique_index"`
		V0    string `gorm:"size:512;uniqueIndex:unique_index"`
		V1    string `gorm:"size:512;uniqueIndex:unique_index"`
		V2    string `gorm:"size:512;uniqueIndex:unique_index"`
		V3    string `gorm:"size:512;uniqueIndex:unique_index"`
		V4    string `gorm:"size:512;uniqueIndex:unique_index"`
		V5    string `gorm:"size:512;uniqueIndex:unique_index"`
	}

	db, _ := gorm.Open(...)

	// Initialize a Gorm adapter and use it in a Casbin enforcer:
	// The adapter will use an existing gorm.DB instnace.
	a, _ := gormadapter.NewAdapterByDBWithCustomTable(db, &CasbinRule{}) 
	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()
}

Getting Help

• Casbin

License

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

Documentation

Index

• type Adapter
  • func NewAdapter(driverName string, dataSourceName string, params ...interface{}) (*Adapter, error)
  • func NewAdapterByDB(db *gorm.DB) (*Adapter, error)
  • func NewAdapterByDBUseTableName(db *gorm.DB, prefix string, tableName string) (*Adapter, error)
  • func NewAdapterByDBWithCustomTable(db *gorm.DB, t interface{}) (*Adapter, error)
  • func NewFilteredAdapter(driverName string, dataSourceName string, params ...interface{}) (*Adapter, error)
  • func (a *Adapter) AddPolicies(sec string, ptype string, rules [][]string) error
  • func (a *Adapter) AddPolicy(sec string, ptype string, rule []string) error
  • func (a *Adapter) IsFiltered() bool
  • func (a *Adapter) LoadFilteredPolicy(model model.Model, filter interface{}) error
  • func (a *Adapter) LoadPolicy(model model.Model) error
  • func (a *Adapter) RemoveFilteredPolicy(sec string, ptype string, fieldIndex int, fieldValues ...string) error
  • func (a *Adapter) RemovePolicies(sec string, ptype string, rules [][]string) error
  • func (a *Adapter) RemovePolicy(sec string, ptype string, rule []string) error
  • func (a *Adapter) SavePolicy(model model.Model) error
  • func (a *Adapter) UpdatePolicy(sec string, ptype string, oldRule, newPolicy []string) error
• type CasbinRule
  • func (CasbinRule) TableName() string
• type Filter

Types

type Adapter

type Adapter struct {
	// contains filtered or unexported fields
}

Adapter represents the Gorm adapter for policy storage.

func NewAdapter

func NewAdapter(driverName string, dataSourceName string, params ...interface{}) (*Adapter, error)

NewAdapter is the constructor for Adapter. Params : databaseName,tableName,dbSpecified

databaseName,{tableName/dbSpecified}
{database/dbSpecified}

databaseName and tableName are user defined. Their default value are "casbin" and "casbin_rule"

dbSpecified is an optional bool parameter. The default value is false. It's up to whether you have specified an existing DB in dataSourceName. If dbSpecified == true, you need to make sure the DB in dataSourceName exists. If dbSpecified == false, the adapter will automatically create a DB named databaseName.

func NewAdapterByDB

func NewAdapterByDB(db *gorm.DB) (*Adapter, error)

NewAdapterByDB creates gorm-adapter by an existing Gorm instance

func NewAdapterByDBUseTableName

func NewAdapterByDBUseTableName(db *gorm.DB, prefix string, tableName string) (*Adapter, error)

NewAdapterByDBUseTableName creates gorm-adapter by an existing Gorm instance and the specified table prefix and table name Example: gormadapter.NewAdapterByDBUseTableName(&db, "cms", "casbin") Automatically generate table name like this "cms_casbin"

func NewAdapterByDBWithCustomTable

func NewAdapterByDBWithCustomTable(db *gorm.DB, t interface{}) (*Adapter, error)

func NewFilteredAdapter

func NewFilteredAdapter(driverName string, dataSourceName string, params ...interface{}) (*Adapter, error)

NewFilteredAdapter is the constructor for FilteredAdapter. Casbin will not automatically call LoadPolicy() for a filtered adapter.

func (*Adapter) AddPolicies

func (a *Adapter) AddPolicies(sec string, ptype string, rules [][]string) error

AddPolicies adds multiple policy rules to the storage.

func (*Adapter) AddPolicy

func (a *Adapter) AddPolicy(sec string, ptype string, rule []string) error

AddPolicy adds a policy rule to the storage.

func (*Adapter) IsFiltered

func (a *Adapter) IsFiltered() bool

IsFiltered returns true if the loaded policy has been filtered.

func (*Adapter) LoadFilteredPolicy

func (a *Adapter) LoadFilteredPolicy(model model.Model, filter interface{}) error

LoadFilteredPolicy loads only policy rules that match the filter.

func (*Adapter) LoadPolicy

func (a *Adapter) LoadPolicy(model model.Model) error

LoadPolicy loads policy from database.

func (*Adapter) RemoveFilteredPolicy

func (a *Adapter) RemoveFilteredPolicy(sec string, ptype string, fieldIndex int, fieldValues ...string) error

RemoveFilteredPolicy removes policy rules that match the filter from the storage.

func (*Adapter) RemovePolicies

func (a *Adapter) RemovePolicies(sec string, ptype string, rules [][]string) error

RemovePolicies removes multiple policy rules from the storage.

func (*Adapter) RemovePolicy

func (a *Adapter) RemovePolicy(sec string, ptype string, rule []string) error

RemovePolicy removes a policy rule from the storage.

func (*Adapter) SavePolicy

func (a *Adapter) SavePolicy(model model.Model) error

SavePolicy saves policy to database.

func (*Adapter) UpdatePolicy

func (a *Adapter) UpdatePolicy(sec string, ptype string, oldRule, newPolicy []string) error

UpdatePolicy updates a new policy rule to DB.

type CasbinRule

type CasbinRule struct {
	PType string `gorm:"size:100"`
	V0    string `gorm:"size:100"`
	V1    string `gorm:"size:100"`
	V2    string `gorm:"size:100"`
	V3    string `gorm:"size:100"`
	V4    string `gorm:"size:100"`
	V5    string `gorm:"size:100"`
}

func (CasbinRule) TableName

func (CasbinRule) TableName() string

type Filter

type Filter struct {
	PType []string
	V0    []string
	V1    []string
	V2    []string
	V3    []string
	V4    []string
	V5    []string
}