Access control lists (ACL)

Access control lists with API constructor
In Aidbox you can configure Access control lists using API Constructor.
aidbox.rest.acl provides a set of operations supporting SQL :filters to be added on each request. :filters can be used to restrict access to resources
Examples
​Aidbox project with API constructor ACL​
​Aidbox project with API constructor multitenancy on ACL​
Code examples on this page are taken from the ACL and the multitenancy example projects
Overview
Available aidbox.rest/op-engines
Expects the same as regular FHIR API engines and also a :filter
aidbox.rest.acl/search
aidbox.rest.acl/create
aidbox.rest.acl/read
aidbox.rest.acl/update
aidbox.rest.acl/conditional-update
aidbox.rest.acl/delete
aidbox.rest.acl/conditional-delete
aidbox.rest.acl/create-with-filter-table-insert — create resource and create entry in filter table
aidbox.rest.acl/patient-level-bulk-export
aidbox.rest.acl/group-level-bulk-export
Example
 search-observation
 {:zen/tags #{aidbox.rest/op}
  :engine   aidbox.rest.acl/search
  :resource "Observation"
  :format   "fhir"
  :filter   observation-filter}
Filter
An ACL operation requires :filter to be specified. A filter requires to define :expression which will be added to a SQL formed by the operation. :expression is made of templates joined with :and or :or operators. A filter optionally accepts :filter-table
Example
 observation-filter
 {:zen/tags     #{aidbox.rest.acl/filter}
  :filter-table acl-box.acl/acl-table
  :expression   [:and acl-box.acl/user-condition
                 acl-box.acl/subject-conditon]}
Filter table insert
aidbox.rest.acl/create-with-filter-table-insert engine requires :filter-table-insert property which links operation with the schema tagged with aidbox.rest.acl/filter-table-insert.
insert-into-filter-table schema has the following keys:
engine: currently only aidbox.rest.acl/filter-table-insert-row-sql is supported
filter-table: zen symbol defining filter table
params: sql parameters. See Parameter section.
values: values to insert in row. This property value is a map in which keys are column names and values are sql substrings for values.
Example
 insert-into-filter-table
 {:zen/tags     #{aidbox.rest.acl/filter-table-insert}
  :engine       aidbox.rest.acl/filter-table-insert-row-sql
  :filter-table acl-box.acl/acl-table
  :params       {:user-id acl-box.acl/user-id-param}
  :values       {:id       "gen_random_uuid()"
                 :txid     "nextval('transaction_id_seq'::text)"
                 :status "'created'"
                 :resource "jsonb_build_object('patient', jsonb_build_object('resourceType', 'Patient',
                                                                             'id', {{target-id}}::text),
                                               'user', jsonb_build_object('resourceType', 'User',
                                                                             'id', {{params.user-id}}::text))"}}
Filter table
Filter table defines SQL table to be joined or searched in with SQL templates.
Example
 acl-table
 {:zen/tags #{aidbox.rest.acl/filter-table}
  :schema   "public" ;; Custom resource table acl-box.custom-resources/PatientAccess
  :name     "patientaccess"}
Template
Defines SQL template string. Accepts params. In the template string you can refer to variables with {{<var>}} syntax. Available variables:
params can be referred with {{params.<path>.<to>.<param>}} syntax.
{{filter-table}} is the :filter-table added to the filter
{{target-resource}} is the jsonb of a resource being checked
{{target-id}} is the id of the resource
Example
 user-condition
 {:zen/tags #{aidbox.rest.acl/sql-template}
  :params   {:user-id user-id-param}
  :template "{{filter-table}}.resource#>>'{user, id}' = {{params.user-id}}"}
​
 subject-conditon
 {:zen/tags #{aidbox.rest.acl/sql-template}
  :template "{{target-resource}}#>>'{subject, id}' = {{filter-table}}.resource#>>'{patient, id}'"}
  
 id-conditon
 {:zen/tags #{aidbox.rest.acl/sql-template}
  :template "{{target-id}} = {{filter-table}}.resource#>>'{patient, id}'"}
Parameter
Defines a path in a request where to get data. The data can be used in a SQL template
Example
 user-id-param
 {:zen/tags      #{aidbox.rest.acl/request-param}
  :source-schema {:type zen/string}
  :path          [:user :id]}
Conditional CRUD
By default, aidbox.rest.acl/create, aidbox.rest.acl/conditional-update, aidbox.rest.acl/conditional-delete engines don't make ACL checks on underlying searches. That can lead to "multiple matches" error even when a user doesn't have access to some resources. Such behavior could be overwritten by acl-checks-on-search? parameter.
Example
 observation-conditional-delete
 {:zen/tags   #{aidbox.rest/op}
  :engine     aidbox.rest.acl/conditional-delete
  :resource   "Observation"
  :format     "fhir"
  :filter     observation-filter
  :acl-checks-on-search? true}
Multitenancy
SMART on FHIR
Last modified 18d ago