Functions
Matchers中的函数
你甚至可以在Matcher中指定函数,使它更强大。 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
.
支持的内置函数如下:
For key-getting functions, they usually take three parameters (except keyGet
):
bool function_name(string url, string pattern, string key_name)
如果密钥 key_name
与模式匹配,他们将返回它的值。如果没有匹配,则返回 ""
。
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"
.
函数 | url | 模式 | 密钥名称 | 示例 |
---|---|---|---|---|
keyGet | 一个URL 路径,例如 /alice_data/resource1 | 一个URL 路径或 * 模式下,例如 /alice_data/* | \ | keyget_model.conf/keymatch_policy.csv |
keyGet2 | a URL path like /proj/resource1 | 一个URL 路径或 : 模式下,例如 /alice_data/:resource | 模式中指定的密钥名称 | keyget_model.conf/keymatch_policy.csv |
keyGet3 | 一个URL 路径,例如 /proj/res3_admin/ | 一个URL 路径或 {} 模式下,例如 /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
怎样增加自定义函数
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)
现在,您可以在您的模型CONF中像这样使用这个函数:
[matchers]
m = r.sub == p.sub && my_func(r.obj, p.obj) && r.act == p.act