Functions
マッチャー内の関数
マッチャー内の関数を指定して、よりパワフルにすることもできます。 You can use built-in functions or specify your own function. The built-in key-matching functions take the following format:
bool function_name(string url, string pattern)
They return a boolean indicating whether the url matches the pattern.
サポートされている組み込み関数は次のとおりです。
For key-getting functions, they usually take three parameters (except keyGet):
bool function_name(string url, string pattern, string key_name)
They will return the value of the key key_name if it matches the pattern, and return "" if nothing is matched.
For example, KeyGet2("/resource1/action", "/:res/action", "res") will return "resource1", and KeyGet3("/resource1_admin/action", "/{res}_admin/*", "res") will return "resource1". As for KeyGet, which takes two parameters, KeyGet("/resource1/action", "/*) will return "resource1/action".
| Function | url | pattern | key_name | example |
|---|---|---|---|---|
| keyGet | a URL path like /proj/resource1 | a URL path or a * pattern like /proj/* | \ | keyget_model.conf/keymatch_policy.csv |
| keyGet2 | a URL path like /proj/resource1 | a URL path or : pattern like /prooj/:resource | key name specified in the pattern | keyget2_model.conf/keymatch2_policy.csv |
| keyGet3 | a URL path like /proj/res3_admin/ | a URL path or {} pattern like /proj/{resource}_admin/* | key name specified in the pattern | https://github.com/casbin/casbin/blob/7bd496f94f5a2739a392d333a9aaaa10ae397673/util/builtin_operators_test.go#L209-L247 |
See details for the above functions at: https://github.com/casbin/casbin/blob/master/util/builtin_operators_test.go
カスタマイズした機能を追加する方法
First, prepare your function. It takes several parameters and returns a bool:
func KeyMatch(key1 string, key2 string) bool {
i := strings.Index(key2, "*")
if i == -1 {
return key1 == key2
}
if len(key1) > i {
return key1[:i] == key2[:i]
}
return key1 == key2[:i]
}
Then, wrap it with interface{} types:
func KeyMatchFunc(args ...interface{}) (interface{}, error) {
name1 := args[0].(string)
name2 := args[1].(string)
return (bool)(KeyMatch(name1, name2)), nil
}
Finally, register the function to the Casbin enforcer:
e.AddFunction("my_func", KeyMatchFunc)
これで、モデルCONFの関数を次のように使用できます。
[matchers]
m = r.sub == p.sub && my_func(r.obj, p.obj) && r.act == p.act