Expose Handlebars infiniteLoops setting (#7926)

Author: Slavek Kabrda

modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/HandlebarsEngineAdapter.java

@@ -45,6 +45,7 @@ public class HandlebarsEngineAdapter extends AbstractTemplatingEngineAdapter {
 
     // We use this as a simple lookup for valid file name extensions. This adapter will inspect .mustache (built-in) and infer the relevant handlebars filename
     private final String[] canCompileFromExtensions = new String[]{".handlebars",".hbs",".mustache"};
+    private boolean infiniteLoops = false;
 
     /**
      * Provides an identifier used to load the adapter. This could be a name, uuid, or any other string.
@@ -82,6 +83,7 @@ public TemplateSource sourceAt(String location) {
         StringHelpers.register(handlebars);
         handlebars.registerHelpers(ConditionalHelpers.class);
         handlebars.registerHelpers(org.openapitools.codegen.templating.handlebars.StringHelpers.class);
+        handlebars.setInfiniteLoops(infiniteLoops);
         Template tmpl = handlebars.compile(templateFile);
         return tmpl.apply(context);
     }
@@ -121,5 +123,16 @@ public boolean handlesFile(String filename) {
         // disallow any extension-only files like ".hbs" or ".mustache", and only consider a file compilable if it's handlebars or mustache (from which we later infer the handlebars filename)
         return Arrays.stream(canCompileFromExtensions).anyMatch(suffix -> !suffix.equalsIgnoreCase(filename) && filename.endsWith(suffix));
     }
+
+    /**
+     * Enable/disable infiniteLoops setting for the Handlebars engine. Enabling this allows for recursive partial inclusion.
+     *
+     * @param infiniteLoops Whether to enable (true) or disable (false)
+     * @return this object
+     */
+    public HandlebarsEngineAdapter infiniteLoops(boolean infiniteLoops) {
+        this.infiniteLoops = infiniteLoops;
+        return this;
+    }
 }