Allow module to provide resources and automatically expose them

packages/node_modules/@node-red/runtime/lib/api/nodes.js

@@ -463,5 +463,30 @@ var api = module.exports = {
         } else {
             return null
         }
+    },
+
+    /**
+    * Gets a resource from a module
+    * @param {Object} opts
+    * @param {User} opts.user - the user calling the api
+    * @param {String} opts.module - the id of the module requesting the resource
+    * @param {String} opts.path - the path of the resource
+    * @param {Object} opts.req - the request to log (optional)
+    * @return {Promise<Buffer>} - the resource file as a Buffer or null if not found
+    * @memberof @node-red/runtime_nodes
+    */
+    getModuleResource: async function(opts) {
+        var resourcePath = runtime.nodes.getModuleResource(opts.module, opts.path);
+        if (resourcePath) {
+            return fs.readFile(resourcePath).catch(err => {
+                if (err.code === 'EISDIR') {
+                    return null;
+                }
+                err.status = 400;
+                throw err;
+            });
+        } else {
+            return null
+        }
     }
 }