add an API to test for available images for index data

modules/fontane/index-api.xqm

@@ -4,7 +4,7 @@ xquery version "3.1";
  : given page.
  :
  : @author Mathias Göbel
- : @version 1.0
+ : @version 1.1
  : @since 2.5.6
  : :)
 
@@ -285,3 +285,25 @@ return
             }
     }
 };
+
+(:~
+ : Returns available image from TextGrid Repository
+ : @param $id the xml:id of an entity in the database
+ : @return an array of URIs
+ :)
+declare
+  %rest:GET
+  %rest:path("/api/index/image/{$type}/{$id}")
+  %output:method("json")
+
+  %test:arg("id", "Arnoldi-Denkmal")
+  %test:assertTrue
+function index:rendered-entity($type as xs:string, $id as xs:string)
+as item()* {
+    let $request := <hc:request method="get" href="https://textgridlab.org/1.0/tgsearch-public/search/?q=(title:%22{$type}:{$id}%22)" />
+    let $tgsearch := hc:send-request($request)[2]
+    return
+        [
+        $tgsearch//tgmd:textgridUri/string()
+        ]
+};