Authorization handler
An authorization handler is a component that evaluates an authorization requirement against a user and, when applicable, a protected resource.
ASP.NET Core in Action, 3e
AuthorizationHandler is an ASP.NET Core base class for implementing logic that evaluates authorization requirements, optionally against a resource.
- How it is used
- Implements the decision logic behind custom authorization-policy requirements, including rules that depend on a loaded resource.
- How deep it goes
- Works through requirement creation, handler outcomes, policy configuration, registration, and manual resource checks; does not detail the authorization framework's internals.
- Examples
- Uses Gold frequent flyers, airline employees, and banned users for lounge access, then recipe ownership for edit and delete checks.
- What you can do after
- Build it from scratch: define and register handlers for a custom policy, or apply them to a loaded resource through IAuthorizationService.
Read how ASP.NET Core in Action, 3e explains authorization handler →
.NET in Action, Second Edition
An authorization handler is a component that evaluates an authorization requirement against the current user and resource context.
- How it is used
- Enforces named authorization policies at controller actions by evaluating authenticated-user requirements.
- How deep it goes
- Implements requirement evaluation, success semantics, policy registration, and dependency-injection wiring, while warning against hardcoded production identity data.
- Examples
- Uses the OnlyMeRequirement, preferred_username claim, OnlyMe policy, and controller actions for reading and creating books.
- What you can do after
- Build custom ASP.NET Core authorization requirements and handlers, then apply them through named policies.
Read how .NET in Action, Second Edition explains authorization handler →
Related concepts
- authorization requirementuses · An authorization requirement is a condition that must be satisfied for an authorization policy to permit access to a resource or operation.
- authorizationincludes · Authorization is the determination and enforcement of rules governing which subjects may access resources or perform operations.
- policyused by · A policy is a rule, strategy, or mapping that governs or determines decisions, actions, permissions, or behavior under specified conditions.
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