Inferring lapp:endUserApplication/`lapp:adminApplication/ on the fly

Author: namedgraph

config/system.trig

@@ -24,7 +24,6 @@
         ldt:ontology <https://w3id.org/atomgraph/linkeddatahub/admin#> ;
         ldt:service <urn:linkeddatahub:services/admin> ;
         ac:stylesheet <static/xsl/admin/layout.xsl> ;
-        lapp:endUserApplication <urn:linkeddatahub:apps/end-user> ;
         lapp:frontendProxy <http://varnish-frontend:6060/> .
 
 }
@@ -53,7 +52,6 @@
         ldt:ontology <https://localhost:4443/ns#> ;
         ldt:service <urn:linkeddatahub:services/end-user> ;
         ac:stylesheet <static/xsl/layout.xsl> ;
-        lapp:adminApplication <urn:linkeddatahub:apps/admin> ;
         lapp:frontendProxy <http://varnish-frontend:6060/> ;
         lapp:public true .
 
@@ -71,3 +69,32 @@
         lapp:backendProxy <http://varnish-end-user/> .
 
 }
+
+# northwind-traders admin
+
+<urn:linkeddatahub:apps/northwind-traders/admin>
+{
+    <urn:linkeddatahub:apps/northwind-traders/admin> a lapp:Application, lapp:AdminApplication ;
+        dct:title "Northwind Traders admin" ;
+        lapp:origin <https://admin.northwind-traders.demo.localhost:4443> ;
+        ldt:ontology <https://w3id.org/atomgraph/linkeddatahub/admin#> ;
+        ldt:service <urn:linkeddatahub:services/admin> ;
+        ac:stylesheet <static/xsl/admin/layout.xsl> ;
+        lapp:frontendProxy <http://varnish-frontend:6060/> .
+
+}
+
+# northwind-traders end-user
+
+<urn:linkeddatahub:apps/northwind-traders/end-user>
+{
+    <urn:linkeddatahub:apps/northwind-traders/end-user> a lapp:Application, lapp:EndUserApplication ;
+        dct:title "Northwind Traders" ;
+        lapp:origin <https://northwind-traders.demo.localhost:4443> ;
+        ldt:ontology <https://northwind-traders.demo.localhost:4443/ns#> ;
+        ldt:service <urn:linkeddatahub:services/end-user> ;
+        ac:stylesheet <static/xsl/layout.xsl> ;
+        lapp:frontendProxy <http://varnish-frontend:6060/> ;
+        lapp:public true .
+
+}

src/main/java/com/atomgraph/linkeddatahub/apps/model/admin/impl/ApplicationImpl.java

@@ -20,8 +20,10 @@
 import com.atomgraph.linkeddatahub.apps.model.EndUserApplication;
 import com.atomgraph.linkeddatahub.vocabulary.Admin;
 import com.atomgraph.linkeddatahub.vocabulary.LAPP;
+import java.net.URI;
 import org.apache.jena.enhanced.EnhGraph;
 import org.apache.jena.graph.Node;
+import org.apache.jena.rdf.model.ResIterator;
 import org.apache.jena.rdf.model.Resource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -50,9 +52,27 @@ public ApplicationImpl(Node n, EnhGraph g)
     @Override
     public EndUserApplication getEndUserApplication()
     {
-        Resource app = getPropertyResourceValue(LAPP.endUserApplication);
-        if (app != null) return app.as(EndUserApplication.class);
-        
+        URI originURI = getOriginURI();
+        if (originURI == null) return null;
+
+        // derive end-user origin by stripping the "admin." subdomain from the host
+        String host = originURI.getHost();
+        if (!host.startsWith("admin.")) return null;
+        String endUserHost = host.substring("admin.".length());
+        URI endUserOrigin = URI.create(originURI.getScheme() + "://" + endUserHost +
+            (originURI.getPort() != -1 ? ":" + originURI.getPort() : ""));
+
+        ResIterator it = getModel().listSubjectsWithProperty(LAPP.origin,
+            getModel().createResource(endUserOrigin.toString()));
+        try
+        {
+            if (it.hasNext()) return it.next().as(EndUserApplication.class);
+        }
+        finally
+        {
+            it.close();
+        }
+
         return null;
     }
 

src/main/java/com/atomgraph/linkeddatahub/apps/model/end_user/impl/ApplicationImpl.java

@@ -18,9 +18,10 @@
 
 import com.atomgraph.linkeddatahub.apps.model.AdminApplication;
 import com.atomgraph.linkeddatahub.apps.model.EndUserApplication;
+import java.net.URI;
 import org.apache.jena.enhanced.EnhGraph;
 import org.apache.jena.graph.Node;
-import org.apache.jena.rdf.model.Resource;
+import org.apache.jena.rdf.model.ResIterator;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import com.atomgraph.linkeddatahub.vocabulary.LAPP;
@@ -49,9 +50,25 @@ public ApplicationImpl(Node n, EnhGraph g)
     @Override
     public AdminApplication getAdminApplication()
     {
-        Resource app = getPropertyResourceValue(LAPP.adminApplication);
-        if (app != null) return app.as(AdminApplication.class);
-        
+        URI originURI = getOriginURI();
+        if (originURI == null) return null;
+
+        // derive admin origin by prepending "admin." to the host
+        String adminHost = "admin." + originURI.getHost();
+        URI adminOrigin = URI.create(originURI.getScheme() + "://" + adminHost +
+            (originURI.getPort() != -1 ? ":" + originURI.getPort() : ""));
+
+        ResIterator it = getModel().listSubjectsWithProperty(LAPP.origin,
+            getModel().createResource(adminOrigin.toString()));
+        try
+        {
+            if (it.hasNext()) return it.next().as(AdminApplication.class);
+        }
+        finally
+        {
+            it.close();
+        }
+
         return null;
     }
 

src/main/java/com/atomgraph/linkeddatahub/vocabulary/LAPP.java

@@ -68,10 +68,10 @@ public static String getURI()
     public static final OntClass Package = m_model.createClass( NS + "Package" );
 
     /** Admin application class */
-    public static final ObjectProperty adminApplication = m_model.createObjectProperty( NS + "adminApplication" );
-
-    /** End-user application class */
-    public static final ObjectProperty endUserApplication = m_model.createObjectProperty( NS + "endUserApplication" );
+//    public static final ObjectProperty adminApplication = m_model.createObjectProperty( NS + "adminApplication" );
+//
+//    /** End-user application class */
+//    public static final ObjectProperty endUserApplication = m_model.createObjectProperty( NS + "endUserApplication" );
 
     /** Frontend proxy property */
     public static final ObjectProperty frontendProxy = m_model.createObjectProperty( NS + "frontendProxy" );