Adobe Experience Manager - How can we get currentPage url into Datasource - aem

Question

Below is datasource.jsp for adding dynamic dropdown into my customComponent dialog, I'm using this datasource in my customComponent as below mentioned field.
Here my requirement is need to get url values to dropdown when my customComponent used in any page(this page having urls). So here i need that currentPage url where i have used my customComponent.
Please help me to get that page url where i have used my customComponent to this datasource.
<%
request.setAttribute(DataSource.class.getName(), EmptyDataSource.instance());
ResourceResolver resolver = resource.getResourceResolver();
//Create an ArrayList to hold data
List<Resource> fakeResourceList = new ArrayList<Resource>();
ValueMap vm = null;
Resource childResource = resourceResolver.getResource(currentPage.getPath()+"/jcr:content/node/path");
if(childResource!=null){
Node childNode = childResource.adaptTo(Node.class);
Node childLinks = childNode.getNode("childnode");
if(childLinks!=null){
NodeIterator childrenNodes = childLinks.getNodes();
while(childrenNodes.hasNext()) {
vm = new ValueMapDecorator(new HashMap<String, Object>());
Node next = childrenNodes.nextNode();
String label = next.getProperty("label").getValue().getString();
String path = next.getProperty("url").getValue().getString();
vm.put("text",label);
vm.put("value",path.substring(1));
fakeResourceList.add(new ValueMapResource(resolver, new ResourceMetadata(), "nt:unstructured", vm));
}
}
} else {
vm = new ValueMapDecorator(new HashMap<String, Object>());
vm.put("text","NoValue");
vm.put("value","");
fakeResourceList.add(new ValueMapResource(resolver, new ResourceMetadata(), "nt:unstructured", vm));
}
DataSource ds = new SimpleDataSource(fakeResourceList.iterator());
request.setAttribute(DataSource.class.getName(), ds);
%>
In my customComponent dialog content.xml which is using above datasource as it's sling:resourceType.
<dataSourceTest
jcr:primaryType="nt:unstructured"
sling:resourceType="granite/ui/components/foundation/form/select"
fieldDescription="Provide ID"
fieldLabel="Anchor"
name="./datasourceTest">
<datasource
jcr:primaryType="nt:unstructured"
sling:resourceType="/apps/mysite/components/page/datasource"/>
</dataSourceTest>

Answer 1

The SlingHttpServletRequest (in general) provides an instance of SlingBindings, which contains a reference to "currentPage" (I am using the static field WCMBindings.CURRENT_PAGE [dependency: groupId: com.adobe.cq.sightly, artifactId: cq-wcm-sightly-extension, version: 1.2.30] in my example).
The Optional I am using in my example is a Java 8 class which can be used to avoid too many checks for null references.
final Optional<Page> optional = Optional.ofNullable(request)
.map(req -> (SlingBindings) req.getAttribute(SlingBindings.class.getName()))
.map(b -> (Page) b.get(WCMBindings.CURRENT_PAGE));
A simplified/explicit example would be
Page getCurrentPageFromRequest(#Nonnull final SlingHTTPRequest request) {
final SlingBindings bindings = (SlingBindings) request.getAttribute(SlingBindings.class.getName())
if (bindings == null) {
return null;
}
return (Page) bindings.get(WCMBindings.CURRENT_PAGE);
}

Answer 2

In the code for the datasource's resourceType, you can get the URL of the current page by reading the CONTENTPATH attribute and using the resource resolver to get a resource which you can then adapt to a Node. The node will be the content item for the dialog. Confirmed to work in AEM 6.2.
// get list of child nodes of the current component node
Resource res = resourceResolver.getResource((String) request.getAttribute(Value.CONTENTPATH_ATTRIBUTE));
Node node = res.adaptTo(Node.class);
log.info(node.getPath());
source: https://rmengji.wordpress.com/2016/07/16/aem-6-2-touch-ui-dropdown-pulling-data-dynamically-using-sightly/