added setEncryptionAdapter to enable upstream crypto (#21)

* added setEncryptionAdapter to enable upstream crypto

* added missing semicolon

* added missing parenthesis

* renamed function to override hashing method

* added missing semicolon

* fixed typo

* fixed typo

* corrected definitions

* exported function

* fixed typo on definitions

fh-sync-js.d.ts

@@ -317,6 +317,13 @@ declare module SyncClient {
          * @param handler - function that wraps underlying storage solution
          */
         function setStorageAdapter(handler: (dataset_id:string, isSave: boolean, cb: any) => void);
+
+        /**
+         * Allows to override default hashing method
+         *
+         * @param handler - function that wraps underlying hashing method
+         */
+        function setHashMethod(method: () => any);
 }
 
 export = SyncClient;

src/sync-client.js

@@ -527,7 +527,7 @@ var self = {
   },
 
   generateHash: function(object) {
-    var hash = CryptoJS.SHA1(self.sortedStringify(object));
+    var hash = self.getHashMethod(self.sortedStringify(object));
     return hash.toString();
   },
 
@@ -908,6 +908,11 @@ var self = {
   setStorageAdapter: function(adapter){
     self.getStorageAdapter = adapter;
   },
+
+  /** Allow to set custom hasing method **/
+  setHashMethod: function(method){
+    self.getHashMethod = method;
+  },
 
   getStorageAdapter: function(dataset_id, isSave, cb){
     var onFail = function(msg, err){
@@ -920,6 +925,8 @@ var self = {
     });
   },
 
+  getHashMethod: CryptoJS.SHA1,
+
   saveDataSet: function (dataset_id, cb) {
     self.getDataSet(dataset_id, function(dataset) {
       self.getStorageAdapter(dataset_id, true, function(err, storage){
@@ -1260,5 +1267,6 @@ module.exports = {
   clearCache: self.clearCache,
   setCloudHandler: self.setCloudHandler,
   doCloudCall: self.doCloudCall,
-  setStorageAdapter: self.setStorageAdapter
+  setStorageAdapter: self.setStorageAdapter,
+  setHashMethod: self.setHashMethod
 };