er: add enableSchemaUrlRedirect config option

.changeset/lovely-months-mix.md

@@ -0,0 +1,5 @@
+---
+"@zazuko/trifid-entity-renderer": minor
+---
+
+Add `enableSchemaUrlRedirect` configuration option (experimental).

packages/entity-renderer/README.md

@@ -93,6 +93,8 @@ The default redirect query supports `http://www.w3.org/2011/http#` and `http://w
   Each rule is either a string or an object with the following properties:
   - `find`: the string to find
   - `replace`: the string to replace with (optional, the default value will be the current hostname)
+- `enableSchemaUrlRedirect` (experimental): If set to `true`, the plugin will perform a redirect if the URI contains a `schema:URL` predicate poiting to a resource of type `xsd:anyURI`.
+  The default value is `false`.
 
 ## Run an example instance
 

packages/entity-renderer/index.js

@@ -103,6 +103,7 @@ const defaultConfiguration = {
     LIMIT 1
   `,
   followRedirects: false,
+  enableSchemaUrlRedirect: false, // Experimental
 }
 
 const fixContentTypeHeader = (contentType) => {
@@ -254,6 +255,18 @@ const factory = async (trifid) => {
 
           const dataset = await rdf.dataset().import(quadStream)
 
+          if (mergedConfig.enableSchemaUrlRedirect && acceptHeader === 'text/html') {
+            // Get all triples that have a schema:URL property with value of type xsd:anyURI
+            const urls = []
+            dataset.match(iriUrlString, rdf.ns.schema.URL)
+              .filter(({ object }) => object.datatype.value === 'xsd:anyURI')
+              .map(({ object }) => urls.push(object.value))
+            if (urls.length > 0) {
+              logger.debug(`Redirecting to ${urls[0]}`)
+              return reply.redirect(urls[0])
+            }
+          }
+
           const { entityHtml, entityLabel, entityUrl } = await entityRenderer(
             request,
             {