Document aliases

pantheon-bundle/src/main/java/com/redhat/pantheon/model/CustomModelAdapterFactory.java

@@ -40,7 +40,8 @@
                 ADAPTER_CLASSES + "=com.redhat.pantheon.model.module.ModuleVariant",
                 ADAPTER_CLASSES + "=com.redhat.pantheon.model.module.ModuleVariants",
                 ADAPTER_CLASSES + "=com.redhat.pantheon.model.module.ModuleVersion",
-                ADAPTER_CLASSES + "=com.redhat.pantheon.model.workspace.Workspace"
+                ADAPTER_CLASSES + "=com.redhat.pantheon.model.workspace.Workspace",
+                ADAPTER_CLASSES + "=com.redhat.pantheon.model.alias.DocumentAlias"
         }
 )
 public class CustomModelAdapterFactory extends SlingModelAdapterFactory {

pantheon-bundle/src/main/java/com/redhat/pantheon/model/alias/DocumentAlias.java

@@ -0,0 +1,16 @@
+package com.redhat.pantheon.model.alias;
+
+import com.redhat.pantheon.model.api.Field;
+import com.redhat.pantheon.model.api.Reference;
+import com.redhat.pantheon.model.api.SlingModel;
+import com.redhat.pantheon.model.document.DocumentVariant;
+
+import javax.inject.Named;
+
+public interface DocumentAlias extends SlingModel {
+
+    Reference<DocumentVariant> target();
+
+    @Named("sling:resourceType")
+    Field<String> slingResourceType();
+}

pantheon-bundle/src/main/java/com/redhat/pantheon/servlet/alias/DocumentAliasRenderer.java

@@ -0,0 +1,74 @@
+package com.redhat.pantheon.servlet.alias;
+
+import com.redhat.pantheon.model.alias.DocumentAlias;
+import com.redhat.pantheon.model.document.DocumentVariant;
+import org.apache.sling.api.SlingHttpServletRequest;
+import org.apache.sling.api.SlingHttpServletResponse;
+import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
+import org.apache.sling.servlets.annotations.SlingServletResourceTypes;
+import org.jetbrains.annotations.NotNull;
+import org.osgi.framework.Constants;
+import org.osgi.service.component.annotations.Component;
+
+import javax.jcr.RepositoryException;
+import javax.servlet.Servlet;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+
+@Component(
+        service = Servlet.class,
+        property = {
+                Constants.SERVICE_DESCRIPTION + "=Renders the alias nodes",
+                Constants.SERVICE_VENDOR + "=Red Hat Content Tooling team"
+        })
+@SlingServletResourceTypes(
+        methods = "GET",
+        resourceTypes = "pantheon/alias",
+        extensions = {"json", "html"}
+)
+public class DocumentAliasRenderer extends SlingSafeMethodsServlet {
+
+    @Override
+    protected void doGet(@NotNull SlingHttpServletRequest request, @NotNull SlingHttpServletResponse response) throws ServletException, IOException {
+        DocumentAlias alias = request.getResource().adaptTo(DocumentAlias.class);
+        String requestedExt = request.getRequestPathInfo().getExtension();
+
+        DocumentVariant docVariant = null;
+        try {
+            docVariant = alias.target().getReference();
+        } catch (RepositoryException e) {
+            throw new ServletException(e);
+        }
+        if(docVariant == null) {
+            response.sendError(HttpServletResponse.SC_NOT_FOUND);
+        }
+        else if(requestedExt.equalsIgnoreCase("html")) {
+            // FIXME This is doing a lot of backtracking up the tree to get to the parent document
+            request.getRequestDispatcher(docVariant.getParent().getParent().getParent().getPath()
+                    + ".preview")
+                    .forward(request, response);
+        }
+        else if(requestedExt.equalsIgnoreCase("json")) {
+            // TODO these strings should probably go to a constant
+            if(docVariant.getResourceType().equals("pantheon/moduleVariant")) {
+                request.getRequestDispatcher("/api/module/variant." + requestedExt + "/"
+                        + docVariant.uuid().get())
+                        .forward(request, response);
+            }
+            else if(docVariant.getResourceType().equals("pantheon/assemblyVariant")) {
+                request.getRequestDispatcher("/api/assembly/variant." + requestedExt + "/"
+                        + docVariant.uuid().get())
+                        .forward(request, response);
+            }
+            else {
+                throw new ServletException("Unsupported document type: " + docVariant.getResourceType());
+            }
+        }
+        else {
+            // TODO This return code makes sense philosophically, but there might be a
+            //  better response
+            response.sendError(HttpServletResponse.SC_UNSUPPORTED_MEDIA_TYPE);
+        }
+    }
+}