add demo and update doc

README.md

@@ -99,5 +99,80 @@ g, alice, data_group_admin
 
 ## casbin v2
 ```go
+package main
+
+import (
+	"fmt"
+
+	scas "github.com/qiangmzsx/string-adapter/v2"
+
+	"github.com/casbin/casbin/v2"
+	"github.com/casbin/casbin/v2/model"
+)
+
+func main() {
+
+	modelText := `
+[request_definition]
+r = sub, obj, act
+
+[policy_definition]
+p = sub, obj, act
+
+[role_definition]
+g = _, _
+g2 = _, _
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = g(r.sub, p.sub) && g2(r.obj, p.obj) && r.act == p.act`
+
+	m := model.Model{}
+
+	m.LoadModelFromText(modelText)
+
+	line := `
+p, alice, data1, read
+p, bob, data2, write
+p, data_group_admin, data_group, write
+
+g, alice, data_group_admin
+g2, data1, data_group
+g2, data2, data_group
+`
+	sa := scas.NewAdapter(line)
+
+	// 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)
+	e, _ := casbin.NewEnforcer(m, sa)
+
+	// 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.
+	if res, _ := e.Enforce("alice", "data1", "read"); res {
+		fmt.Println("permitted")
+	} else {
+		fmt.Println("rejected")
+	}
+
+	// Modify the policy.
+	// e.AddPolicy(...)
+	// e.RemovePolicy(...)
+
+	// Save the policy back to DB.
+	e.SavePolicy()
+}
 
 ```

demo/v1/v1_demo.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"fmt"
+
+	scas "github.com/qiangmzsx/string-adapter"
+
+	"github.com/casbin/casbin"
+	"github.com/casbin/casbin/model"
+)
+
+func main() {
+
+	modelText := `
+[request_definition]
+r = sub, obj, act
+
+[policy_definition]
+p = sub, obj, act
+
+[role_definition]
+g = _, _
+g2 = _, _
+
+[policy_effect]
+e = some(where (p.eft == allow))
+
+[matchers]
+m = g(r.sub, p.sub) && g2(r.obj, p.obj) && r.act == p.act`
+
+	m := model.Model{}
+
+	m.LoadModelFromText(modelText)
+
+	line := `
+p, alice, data1, read
+p, bob, data2, write
+p, data_group_admin, data_group, write
+
+g, alice, data_group_admin
+g2, data1, data_group
+g2, data2, data_group
+`
+	sa := scas.NewAdapter(line)
+
+	// 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)
+	e := casbin.NewEnforcer(m, sa)
+
+	// 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.
+	if res := e.Enforce("alice", "data1", "read"); res {
+		fmt.Println("permitted")
+	} else {
+		fmt.Println("rejected")
+	}
+
+	// Modify the policy.
+	// e.AddPolicy(...)
+	// e.RemovePolicy(...)
+
+	// Save the policy back to DB.
+	e.SavePolicy()
+}

demo/v2_demo.go → demo/v2/v2_demo.go

@@ -18,22 +18,28 @@ r = sub, obj, act
 [policy_definition]
 p = sub, obj, act
 
+[role_definition]
+g = _, _
+g2 = _, _
+
 [policy_effect]
 e = some(where (p.eft == allow))
 
 [matchers]
-m = r.sub == r.obj.Owner`
+m = g(r.sub, p.sub) && g2(r.obj, p.obj) && r.act == p.act`
 
 	m := model.Model{}
 
 	m.LoadModelFromText(modelText)
 
 	line := `
-p, alice, /alice_data/*, (GET)|(POST)
-p, alice, /alice_data/resource1, POST
-p, data_group_admin, /admin/*, POST
-p, data_group_admin, /bob_data/*, POST
+p, alice, data1, read
+p, bob, data2, write
+p, data_group_admin, data_group, write
+
 g, alice, data_group_admin
+g2, data1, data_group
+g2, data2, data_group
 `
 	sa := scas.NewAdapter(line)