Use Open Policy Agent to enforce access control policies in SMART on FHIR applications

[Rob Ferguson]

See: https://rob-ferguson.me/use-open-policy-agent-to-enforce-access-control-policies-in-smart-on-fhir-applications/

Introduction
Open Policy Agent (OPA) is a general-purpose policy engine that includes a high-level declarative language that you can use to define access control policies, enabling fine-grained access control in applications that leverage SMART on FHIR for authorisation and FHIR for data exchange.

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