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Functions

Funktionen in Übereinstimmungen

Enhance matcher capabilities by incorporating functions. Use built-in functions or define custom ones. Built-in key-matching functions follow this signature:

bool function_name(string url, string pattern)

These functions return booleans indicating whether url matches pattern.

Available built-in functions:

FunktionurlpatternBeispiel
keyMatchein URL-Pfad wie /alice_data/resource1ein URL-Pfad oder ein * Muster wie /alice_data/*keymatch_model.conf/keymatch_policy.csv
keyMatch2ein URL-Pfad wie /alice_data/resource1ein URL-Pfad oder ein : Muster wie /alice_data/:resourcekeymatch2_model.conf/keymatch2_policy.csv
keyMatch3ein URL-Pfad wie /alice_data/resource1ein URL-Pfad oder ein {} Muster wie /alice_data/{resource}https://github.com/casbin/casbin/blob/277c1a2b85698272f764d71a94d2595a8d425915/util/builtin_operators_test.go#L171-L196
keyMatch4ein URL-Pfad wie /alice_data/123/book/123ein URL-Pfad oder ein {} Muster wie /alice_data/{id}/book/{id}https://github.com/casbin/casbin/blob/277c1a2b85698272f764d71a94d2595a8d425915/util/builtin_operators_test.go#L208-L222
keyMatch5ein URL-Pfad wie /alice_data/123/?status=1ein URL-Pfad, ein {} oder * Muster wie /alice_data/{id}/*https://github.com/casbin/casbin/blob/1cde2646d10ad1190c0d784c3a1c0e1ace1b5bc9/util/builtin_operators_test.go#L485-L526
regexMatchbeliebiger Stringein reguläres Ausdrucksmusterkeymatch_model.conf/keymatch_policy.csv
ipMatcheine IP-Adresse wie 192.168.2.123eine IP-Adresse oder ein CIDR wie 192.168.2.0/24ipmatch_model.conf/ipmatch_policy.csv
globMatchein pfadähnlicher Pfad wie /alice_data/resource1ein glob-Muster wie /alice_data/*https://github.com/casbin/casbin/blob/277c1a2b85698272f764d71a94d2595a8d425915/util/builtin_operators_test.go#L426-L466

Key-getting functions generally accept three parameters (except keyGet):

bool function_name(string url, string pattern, string key_name)

These return the key_name value when matching the pattern, otherwise returning "".

Examples: KeyGet2("/resource1/action", "/:res/action", "res") returns "resource1", while KeyGet3("/resource1_admin/action", "/{res}_admin/*", "res") returns "resource1". For KeyGet with two parameters: KeyGet("/resource1/action", "/*") returns "resource1/action".

FunktionurlMusterkey_nameBeispiel
keyGetein URL-Pfad wie /proj/resource1ein URL-Pfad oder ein * Muster wie /proj/*\keyget_model.conf/keymatch_policy.csv
keyGet2ein URL-Pfad wie /proj/resource1ein URL-Pfad oder : Muster wie /prooj/:resourceSchlüsselname, der im Muster angegeben istkeyget2_model.conf/keymatch2_policy.csv
keyGet3ein URL-Pfad wie /proj/res3_admin/ein URL-Pfad oder {} Muster wie /proj/{resource}_admin/*Schlüsselname, der im Muster angegeben isthttps://github.com/casbin/casbin/blob/7bd496f94f5a2739a392d333a9aaaa10ae397673/util/builtin_operators_test.go#L209-L247

Complete function details: https://github.com/casbin/casbin/blob/master/util/builtin_operators_test.go

Wie man eine benutzerdefinierte Funktion hinzufügt

Start by creating your function, accepting multiple parameters and returning 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]
}

Next, create an interface{} wrapper:

func KeyMatchFunc(args ...interface{}) (interface{}, error) {
name1 := args[0].(string)
name2 := args[1].(string)

return (bool)(KeyMatch(name1, name2)), nil
}

Register the function with the Casbin enforcer:

e.AddFunction("my_func", KeyMatchFunc)

Use the function in your model CONF:

[matchers]
m = r.sub == p.sub && my_func(r.obj, p.obj) && r.act == p.act