added renaming of files and deletion of existing file name

index.js

@@ -19,6 +19,11 @@ function uploadService(opts) {
 
     fileUploader.config = options;
 
+    fileUploader.ReapplyOptions = function(__opts){
+        var __options = configs.apply(__opts);
+        fileUploader.config = __options;
+    };
+
     function setNoCacheHeaders(res) {
         res.setHeader('Pragma', 'no-cache');
         res.setHeader('Cache-Control', 'no-store, no-cache, must-revalidate');

lib/checkFolder.js

@@ -1,3 +1,4 @@
+'use strict';
 var fs = require('fs');
 var mkdirp  = require('mkdirp');
 /**

lib/configs.js

@@ -1,4 +1,5 @@
 /*jslint node: true */
+'use strict';
 var checkExists     = require('./checkFolder.js');
 
 var options = {
@@ -37,6 +38,8 @@ var options = {
         acl: 'public-read'
       }
     },
+    renameFile:'',
+    deleteExisting: true,
     /**
      * apply custom options to the default options
      */

lib/fileinfo.js

@@ -27,8 +27,17 @@ function FileInfo(file, opts, fields) {
     this.width = udf;
     this.height = udf;
     this.fields = fields;
+    if(this.options.renameFile.length > 0 ){
+        this.name = this.name.substr(0, this.name.lastIndexOf('.')) + this.options.renameFile + this.name.substr(this.name.lastIndexOf('.')+1);
+    }
     if (opts.saveFile) {
-        this.safeName();
+        if(opts.deleteExisting){
+            this.deleteExist();
+        }
+        else
+        {
+            this.safeName();
+        }
     }
 }
 FileInfo.prototype.update = function(file) {
@@ -49,6 +58,15 @@ FileInfo.prototype.safeName = function() {
     }
 };
 
+FileInfo.prototype.deleteExist = function() {
+    var path = this.options.uploadDir + '/' + this.name;
+    fs.exists(path, function(exists) {
+        if (exists) {
+            fs.unlinkSync(path);
+        }
+    });
+};
+
 FileInfo.prototype.initUrls = function() {
 
     var that = this;