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Comment: Reviewed and updated

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Before decoupling was done, the entire key validation process was executed inside a single method named validateKey(), which performed all the operations by running a single query. After decoupling, that single query was broken down into smaller parts by introducing KeyValidationHandler, which  which runs inside the validateKey() operation, providing a way to extend each step.

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A few examples are listed below.

RequirementExtension
When domain You need to skip trivial steps, because its validation does not add any value and you need to skip such trivial stepsvalue.

When creating a key via the API Store, the subscriber can specify which domains are allowed to make calls using a token granted against a particular consumer key. If this validation does not add any value, these trivial steps can be ignored and skipped by extending the KeyValidationHandler.

Info

For another example scenario, see Skipping Role Validation for Scopes.

Need You need to avoid going into detail when validating scopes

Consider a situation where a scope is assigned to a resource and you only need to verify if the token that is used to access the API has at least one or more scopes defined for that API without going into much detail. This requirement can be achieved by extending the validateScope() method.

Need You need to send a different type of token instead of JSON Web Token (JWT) to pass details of API invocation to the backendA JSON Web Token (JWT) is used to pass details of an API invocation to the backend. If a different type of token is required, you can extend the generateConsumerToken() method to achieve this purpose.