browser-ls - npm Package Compare versions

Comparing version 1.3.0 to 1.4.0

dist/ls.min.js

@@ -1,1 +0,1 @@
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index.js

@@ -7,6 +7,6 @@ 'use strict';
 
-module.exports.getAdapter = function getAdapter (name) {
-  var adapter = new LS(name);
+module.exports.getAdapter = function getAdapter (params) {
+  var adapter = new LS(params);
 
   return adapter;
 };

karma.conf.js

@@ -21,3 +21,3 @@ 'use strict';
 
-    browsers: ['Chrome'],
+    browsers: ['PhantomJS'],
 
@@ -24,0 +24,0 @@ singleRun: true

lib/LocalStorage.js

@@ -49,3 +49,12 @@ 'use strict';
 
+/**
+ * Default drop in for processor hook for pre-save and post-load
+ * @param  {String}   v
+ * @param  {Function} callback
+ */
+function defProcessor (v, callback) {
+  callback(null, v);
+}
 
+
 /**
@@ -55,7 +64,13 @@ * Class used to provide a wrapper over localStorage
  */
-function LocalStorage (ns) {
+function LocalStorage (params) {
   events.EventEmitter.call(this);
 
-  this.ns = ns || '';
+  if (!params || typeof params === 'string') {
+    params = {
+      ns: params || ''
+    };
+  }
 
+  this.ns = params.ns || '';
+
   if (typeof this.ns !== 'string') {
@@ -65,2 +80,13 @@ throw new Error('Namespace must be a string.');
 
+  this.preSave = params.preSave || defProcessor;
+  this.postLoad = params.postLoad || defProcessor;
+
+  if (this.preSave && typeof this.preSave !== 'function') {
+    throw new Error('preSave option must be a function');
+  }
+
+  if (this.postLoad && typeof this.postLoad !== 'function') {
+    throw new Error('postLoad option must be a function');
+  }
+
   this.EVENTS = EVENTS;
@@ -107,11 +133,18 @@ }
   callback = wrapCallback(callback);
+  var self = this;
 
-  try {
-    ls.setItem(genStorageKey(this.getNs(), key), value);
-    callback(null, null);
-    this.emit(EVENTS.SET, key, value);
-  } catch (e) {
-    callback(e, null);
-    this.emit(EVENTS.SET_FAILED, key, value);
-  }
+  this.preSave(value, function (err, newVal) {
+    if (err) {
+      callback(err, null);
+    } else {
+      try {
+        ls.setItem(genStorageKey(self.getNs(), key), newVal);
+        callback(null, null);
+        self.emit(EVENTS.SET, key, value, newVal);
+      } catch (e) {
+        callback(e, null);
+        self.emit(EVENTS.SET_FAILED, key, value, newVal);
+      }
+    }
+  });
 };
@@ -150,10 +183,15 @@
 
+  var self = this;
+
   // Pretty sure this doesn't throw, but let's be careful...
   try {
     var item = ls.getItem(genStorageKey(this.getNs(), key));
-    callback(null, item);
 
-    if (!silent) {
-      this.emit(EVENTS.GET, key, item);
-    }
+    this.postLoad(item, function (err, newVal) {
+      callback(err, newVal);
+
+      if (!silent) {
+        self.emit(EVENTS.GET, key, item, newVal);
+      }
+    });
   } catch (e) {
@@ -173,3 +211,7 @@ if (!silent) {
 LocalStorage.prototype.clear = function (callback) {
-  async.eachSeries(this.getKeys(), this.remove.bind(this), function (err) {
+  var self = this;
+
+  async.eachSeries(this.getKeys(), function (k, cb) {
+    self.remove(k, cb);
+  }, function (err) {
     // Ensure error passed is null to keep with standards
@@ -176,0 +218,0 @@ callback(err || null, null);

package.json

 {
   "name": "browser-ls",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "description": "Tiny wrapper for localStorage (DOM Storage) that handles exceptions via callbacks",
@@ -9,2 +9,3 @@ "main": "./index.js",
   },
+  "repository": "https://github.com/evanshortiss/browser-local-storage",
   "keywords": [
@@ -35,5 +36,4 @@ "localStorage",
     "sinon": "~1.11.1",
-    "karma-sinon": "~1.0.3",
-    "karma-chrome-launcher": "~0.1.5"
+    "karma-sinon": "~1.0.3"
   }
 }

README.md

@@ -5,3 +5,4 @@ browser-ls
 [![build-status](https://travis-ci.org/evanshortiss/browser-local-storage.svg?branch=master)
-](https://travis-ci.org/evanshortiss/browser-local-storage.svg?branch=master)
+](https://travis-ci.org/evanshortiss/browser-local-storage.svg?branch=master)[![version](https://badge.fury.io/js/browser-ls.svg)
+](https://badge.fury.io/js/browser-ls.svg)
 
@@ -166,2 +167,69 @@ browser-ls provides a nice node-like wrapper on the localStorage API in
 Using a single instance to do this would have overwritten the Users value with 
-that of the plain ls interface.
+that of the plain ls interface.
+
+_getAdapter_ also has more advanced usage and supports pre-save and post-load 
+transforms. These are useful if you need to store encrypted data or performs 
+modification of data prior to saving. Here's an example"
+
+```javascript
+var ls = require('browser-ls');
+var encryption = require('./encryption');
+var userId = 'user-1234';
+
+var Users = ls.getAdapter({
+	ns: 'Users', // Store data under this namespace
+	preSave: doEncrypt,
+	postLoad: doDecrypt
+});
+
+function doEncrypt (val, callback) {
+	// val is the value passed to the .set method below
+	encryption.encrypt(val, function (err, encryptedVal) {
+		if (err) {
+			callback(err, null);
+		} else {
+			// Send the updated value to the callback to be saved
+			callback(null, encryptedVal)
+		}
+	});
+}
+
+function doEncrypt (val, callback) {
+	// val is the value that the module got from localStorage 
+	// in this case it is the encrypted value of:
+	// '{"name":"evan","location":"USA"}''
+	encryption.decrypt(val, function (err, decryptedVal) {
+		if (err) {
+			callback(err, null);
+		} else {
+			// Send the updated value to the callback to be loaded
+			callback(null, decryptedVal)
+		}
+	});
+}
+
+// This JSON string being saved will be encrypted by preSave
+Users.set(userId, JSON.stringify({
+	name: 'evan',
+	location: 'USA'
+}));
+
+
+// The value we get will automatically be decrpyted
+Users.get(userId, function (err, user) {
+	// user object will be equal to the originally saved data
+});
+```
+
+In the above examples you could replace _set_ and _get_ with _setJson_ and 
+_getJson_ and the encryption would still work since the pre and post functions 
+are called directly before the safe after the JSON is stringified (set) and 
+before it's parsed (get).
+
+## Changelog
+
+#### 1.4.0
+Added support for pre-save and post-load transforms.
+
+#### pre 1.4.0
+Not documented...

tests/index.js

@@ -16,3 +16,8 @@ 'use strict';
 
+// Remove everything from localStorage
+Object.keys(window.localStorage).forEach(function (k) {
+  window.localStorage.removeItem(k);
+});
 
+
 describe('ls Module', function () {
@@ -150,2 +155,18 @@
     });
+
+    it('Should modify the value before being set', function () {
+      var adp = window.ls.getAdapter({
+        preSave: function (val, callback) {
+          callback(null, val.replace('evan', ''));
+        }
+      });
+
+      adp.set(TEST_STR_KEY, 'evanshortiss', function (err) {
+        expect(err).to.be.null;
+        adp.get(TEST_STR_KEY, function (e, res) {
+          expect(e).to.be.null;
+          expect(res).to.equal('shortiss');
+        });
+      });
+    });
   });
@@ -186,2 +207,18 @@
     });
+
+    it ('Should modify an item during retreival', function () {
+      var adp = window.ls.getAdapter({
+        postLoad: function (val, callback) {
+          callback(null, val.replace('evan', ''));
+        }
+      });
+
+      adp.set(TEST_STR_KEY, 'evanshortiss', function (err) {
+        expect(err).to.be.null;
+        adp.get(TEST_STR_KEY, function (e, res) {
+          expect(e).to.be.null;
+          expect(res).to.equal('shortiss');
+        });
+      });
+    });
   });
@@ -188,0 +225,0 @@

Fixed alerts

No repository

Supply chain risk

Package does not have a linked source code repository. Without this field, a package will have no reference to the location of the source code use to generate the package.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

120482

increased by5.83%

Dev dependency count

12

decreased by-7.69%

Number of package files

15

increased by7.14%

Lines of code

2646

increased by3.97%

Number of lines in readme file

233

increased by41.21%

No dependency changes