In WebAC you can use the acl:agentClass property of an Authorization to point to a resource that holds a list of usernames. This allows you to create and manage groups of users within Fedora, and to assign different permissions to different groups. This how-to will guide you through the process of creating a resource, creating an agentClass group, and limiting access to that resource through an ACL that references that agentClass group.

Prerequisites

• a running Fedora 4 with the WebAC module enabled, at http://localhost:8080/fcrepo (an easy way to get this is to run the Fedora 4 Vagrant)
• curl

Steps

1. Create these four files:

   Code Block
   language text title acl.ttl
   @prefix webac: <http://fedora.info/definitions/v4/webac#>. @prefix ldp: <http://www.w3.org/ns/ldp#>. <> a webac:Acl, ldp:BasicContainer.

   Code Block
   language text title group.ttl
   @prefix ldp: <http://www.w3.org/ns/ldp#>. @prefix foaf: <http://xmlns.com/foaf/0.1/> . <> a ldp:BasicContainer, foaf:Group; foaf:member "testuser".

   Code Block
   language text title foo.ttl
   @prefix ldp: <http://www.w3.org/ns/ldp#>. @prefix acl: <http://www.w3.org/ns/auth/acl#>. @prefix dc: <http://purl.org/dc/elements/1.1/>. <> a ldp:BasicContainer; acl:accessControl </fcrepo/rest/acl>; dc:title "Hello, World!".

   Code Block
   language text title authz.ttl
   @prefix acl: <http://www.w3.org/ns/auth/acl#>. <> a acl:Authorization; acl:accessTo </fcrepo/rest/foo>; acl:agentClass </fcrepo/rest/group>; acl:mode acl:Read.

2. Upload these resources into Fedora:

   Code Block
   language text
   $ curl -X PUT http://localhost:8080/fcrepo/rest/acl -u fedoraAdmin:secret3 \ -H "Content-Type: text/turtle" --data-binary @acl.ttl $ curl -X PUT http://localhost:8080/fcrepo/rest/foo -u fedoraAdmin:secret3 \ -H "Content-Type: text/turtle" --data-binary @foo.ttl $ curl -X PUT http://localhost:8080/fcrepo/rest/group -u fedoraAdmin:secret3 \ -H "Content-Type: text/turtle" --data-binary @group.ttl $ curl -X PUT http://localhost:8080/fcrepo/rest/acl/authz -u fedoraAdmin:secret3 \ -H "Content-Type: text/turtle" --data-binary @authz.ttl

   (Note: The order you upload these in is important, since foo references acl, and authz references foo and group)

3. Test that testuser can read the foo resource, while adminuser cannot: 

   Code Block
   language text
   $ curl -i http://localhost:8080/fcrepo/rest/foo -u testuser:password1 $ curl -i http://localhost:8080/fcrepo/rest/foo -u adminuser:password2

   The first request should respond with 200 OK, while the second should be 403 Forbidden.

   To allow adminuser to also read the foo resource, we can add adminuser to the members of the group.

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