Finding api improvements (#57)

* fidItemsByKeywords accepts parameters now - keywords, pageNumber, limit, sortOrder. It still supports just passing one keyword

* lint fixes

* added updates in the readme

Author: piggydoughnut

README.md

@@ -99,7 +99,7 @@ ebay.getAccessToken().then((data) => {
 
 ### Finding Api
 ```javascript
-//This call searches for items on eBay using specific eBay category ID numbers 
+//This call searches for items on eBay using specific eBay category ID numbers
 ebay.findItemsByCategory(10181).then((data) => {
     console.log(data);
 }, (error) => {
@@ -113,6 +113,18 @@ ebay.findItemsByKeywords('iphone').then((data) => {
     console.log(error);
 });
 
+
+ebay.findItemsByKeywords({
+    keywords: 'Garmin nuvi 1300 Automotive GPS Receiver',
+    sortOrder: 'PricePlusShippingLowest', //https://developer.ebay.com/devzone/finding/callref/extra/fndcmpltditms.rqst.srtordr.html
+    pageNumber: 2,
+    limit: 10
+}).then((data) => {
+    console.log(data);
+}, (error) => {
+    console.log(error);
+});
+
 // This call searches for items whose listings are completed and are no longer available for sale by category (using categoryId), by keywords (using keywords), or a combination of the two.
 ebay.findCompletedItems({
     keywords: 'Garmin nuvi 1300 Automotive GPS Receiver',
@@ -292,7 +304,7 @@ ebay.getAllCategories('1234').then((data) => {
     console.log(error);
 });
 
-// Get User Profile 
+// Get User Profile
 //https://developer.ebay.com/devzone/shopping/docs/callref/GetUserProfile.html
 ebay.getUserDetails({ userId: 'ajaykumapratha_0', details: true }).then((data) => {
     console.log(data);

src/findingApi.js

@@ -3,11 +3,24 @@
 const urlObject = require('./buildURL');
 const { getRequest } = require('./request');
 
-const findItemsByKeywords = function (keyword) {
-    if (!keyword) throw new Error('Keyword is missing, Keyword is required');
-    this.options.name = keyword;
+const findItemsByKeywords = function (options) {
+    if (!options || !options.keywords) {
+        throw new Error('Keyword is missing, Keyword is required');
+    }
+
     this.options.operationName = 'findItemsByKeywords';
     this.options.param = 'keywords';
+
+    if (!options.keywords) {
+        this.options.name = options;
+    }
+    else {
+        this.options.name = encodeURIComponent(options.keywords);
+        this.options.sortOrder = options.sortOrder;
+        this.options.pageNumber = options.pageNumber;
+        this.options.limit = options.limit;
+    }
+
     const url = urlObject.buildSearchUrl(this.options);
     return getRequest(url).then((data) => {
         return JSON.parse(data).findItemsByKeywordsResponse;