112 lines
3.6 KiB
Text
Executable file
112 lines
3.6 KiB
Text
Executable file
== Evaluation API
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When writing rule-based policies using JavaScript or JBoss Drools, {{book.project.name}} provides an *Evaluation API* which provides useful information to help decide whether a permission should be granted or not.
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This API consists of a few interfaces that provides you access to information such as:
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* The permission being requested
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* The identity asking for a permission, from where you can obtain claims/attributes
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* Runtime environment and any other attribute associated with the execution context
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The main interface is *org.keycloak.authorization.policy.evaluation.Evaluation*, which defines the following contract:
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```java
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public interface Evaluation {
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/**
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* Returns the {@link ResourcePermission} to be evaluated.
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*
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* @return the permission to be evaluated
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*/
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ResourcePermission getPermission();
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/**
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* Returns the {@link EvaluationContext}. Which provides access to the whole evaluation runtime context.
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*
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* @return the evaluation context
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*/
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EvaluationContext getContext();
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/**
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* Grants the requested permission to the caller.
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*/
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void grant();
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/**
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* Denies the requested permission.
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*/
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void deny();
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}
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```
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[NOTE]
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For more details about the Evaluation API refer to http://www.keycloak.org/docs/javadocs/index.html[JavaDocs].
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When processing an authorization request, {{book.project.name}} creates an `Evaluation` instance before evaluating any policy. This instance is then passed to each policy in order to obtain
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a decision, which would be a *GRANT* or a *DENY*.
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Policies take their decisions by invoking the `grant()` or `deny()` methods on an `Evaluation` instance. By default, the state of the `Evaluation` instance is denied, which means that your policies
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need to explicitly invoke the `grant()` method if they want to tell the policy evaluation engine that the permission should be granted.
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=== The Evaluation Context
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The evaluation context provides useful information to policies during their evaluation.
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```java
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public interface EvaluationContext {
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/**
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* Returns the {@link Identity} that represents an entity (person or non-person) to which the permissions must be granted, or not.
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*
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* @return the identity to which the permissions must be granted, or not
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*/
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Identity getIdentity();
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/**
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* Returns all attributes within the current execution and runtime environment.
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*
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* @return the attributes within the current execution and runtime environment
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*/
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Attributes getAttributes();
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}
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```
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From this interface, policies can obtain:
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* The authenticated `Identity`
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* Information about the execution context and runtime environment
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The `Identity` is built based on the OAuth2 Access Token that was sent along with the authorization request, and this construct has access to all claims
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extracted from the original token. For instance, if you are using a _Protocol Mapper_ to include a custom claim in a OAuth2 Access Token you can also access this claim
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from a policy and use it to build your conditions.
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The `EvaluationContext` also gives you access to attributes related to both the execution and runtime environments. For now, there only a few built-in attributes.
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.Execution and Runtime Attributes
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|===
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|Name |Description | Type
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| kc.time.date_time
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| Current date and time
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| String. Format `MM/dd/yyyy hh:mm:ss`
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| kc.client.network.ip_address
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| IPv4 address of the client
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| String
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| kc.client.network.host
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| Client's host name
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| String
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| kc.client.id
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| The client id
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| String
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| kc.client.user_agent
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| The value of the 'User-Agent' HTTP header
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| String[]
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| kc.realm.name
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| The name of the realm
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| String
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|===
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