69 lines
2.3 KiB
Text
69 lines
2.3 KiB
Text
[[_policy_js]]
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=== JavaScript-Based Policy
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You can use this type of policy to define conditions for your permissions using JavaScript. It is one of the rule-based policy types
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supported by {{book.project.name}}, and provides flexibility to write any policy based on the <<fake/../evaluation-api.adoc#_policy_evaluation_api, Evaluation API>>.
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To create a new JavaScript-based policy, select *JavaScript* in the dropdown list in the upper right corner of the policy listing.
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.Add JavaScript Policy
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image:../../{{book.images}}/policy/create-js.png[alt="Add JavaScript Policy"]
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==== Configuration
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* *Name*
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+
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A human-readable and unique string describing the policy. A best practice is to use names that are closely related to your business and security requirements, so you
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can identify them more easily.
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+
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* *Description*
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+
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A string containing details about this policy.
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+
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* *Code*
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+
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The JavaScript code providing the conditions for this policy.
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+
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* *Logic*
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+
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The <<fake/../logic.adoc#_policy_logic, Logic>> of this policy to apply after the other conditions have been evaluated.
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==== Examples
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Here is a simple example of a JavaScript-based policy that uses attribute-based access control (ABAC) to define a condition based on an attribute
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obtained from the execution context:
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```javascript
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var context = $evaluation.getContext();
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var contextAttributes = context.getAttributes();
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if (contextAttributes.containsValue('kc.client.network.ip_address', '127.0.0.1')) {
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$evaluation.grant();
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}
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```
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You can also use role-based access control (RBAC):
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```javascript
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var context = $evaluation.getContext();
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var identity = context.getIdentity();
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if (identity.hasRole('keycloak_user')) {
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$evaluation.grant();
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}
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```
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Or a combination of several access control mechanisms:
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```javascript
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var context = $evaluation.getContext();
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var identity = context.getIdentity();
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var attributes = identity.getAttributes();
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var email = attributes.getValue('email').asString(0);
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if (identity.hasRole('admin') || email.endsWith('@keycloak.org')) {
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$evaluation.grant();
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}
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```
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When writing your own rules, keep in mind that the *$evaluation* object is an object implementing *org.keycloak.authorization.policy.evaluation.Evaluation*. For more information about what you can access from this interface, see the <<fake/../evaluation-api.adoc#_policy_evaluation_api, Evaluation API>>.
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