Fix input validation in multi file APIs

lib/schemaUtils.js

@@ -4815,6 +4815,16 @@ module.exports = {
     };
   },
 
+  /**
+   *
+   * @description Takes in a the root files obtains the related files and
+   * generates the result object
+   * @param {object} parsedRootFiles - found parsed root files
+   * @param {array} inputData - file data information [{path, content}]
+   * @param {Array} origin - process origin (BROWSER or node)
+   *
+   * @returns {object} process result { rootFile, relatedFiles, missingRelatedFiles }
+   */
   getRelatedFilesData(parsedRootFiles, inputData, origin) {
     const data = parsedRootFiles.map((root) => {
       let relatedData = getRelatedFiles(root, inputData, origin),
@@ -4828,6 +4838,17 @@ module.exports = {
     return data;
   },
 
+  /*
+   *
+   * @description Takes in parsed root files and bundle it
+   * @param {object} parsedRootFiles - found parsed root files
+   * @param {array} inputData - file data information [{path, content}]
+   * @param {Array} origin - process origin (BROWSER or node)
+   * @param {string} format - output format could be either YAML or JSON
+   * @param {string} version - specification version specified in the input
+   *
+   * @returns {object} process result { rootFile, bundledContent }
+   */
   getBundledFileData(parsedRootFiles, inputData, origin, format) {
     const data = parsedRootFiles.map((root) => {
       let bundleData = getBundleContentAndComponents(root, inputData, origin);
@@ -4923,6 +4944,28 @@ module.exports = {
     }
   },
 
+  /**
+   *
+   * @description Validates the input for multi file APIs
+   * @param {string} processInput - Process input data
+   *
+   * @returns {undefined} - nothing
+   */
+  validateInputMultiFileAPI(processInput) {
+    if (_.isEmpty(processInput)) {
+      throw new Error('Input object must have "type" and "data" information');
+    }
+    if (!processInput.type) {
+      throw new Error('"Type" parameter should be provided');
+    }
+    if (!processInput.data || processInput.data.length === 0) {
+      throw new Error('"Data" parameter should be provided');
+    }
+    if (processInput.data[0].path === '') {
+      throw new Error('"Path" of the data element should be provided');
+    }
+  },
+
   parseFileOrThrow(fileContent) {
     const result = parse.getOasObject(fileContent);
     if (result.result === false) {