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Recent Articles

27
Mar

How to stop Cross Site Scripting in MVC – with tabbed browsing

If you are familiar with MVC and the AntiForgeryToken approach to preventing cross site scripting, you will be aware of the restrictions it puts in place, in regards to tabbed browsing and session experiences causing multiple problem for users. Improving security of a website, should never degrade the usability of a website for genuine customers or visitors to the site. the MVC default solution to Cross-site Scripting does not allow tabbed browsing (only the most recent tab will be authenticated for POST and AJAX requests. Now that tabbed browsing is available on every device and every browser, this is not an acceptable solution.

The solution is a new hashing algorithm with takes multiple sources of the user, server, MVC solution, .NET session and user agent and provides the user with a unique token which is verified against every POST and AJAX request. The method to this hashing can’t be fully displayed as it could compromise the usefulness of this method. But here is a rundown of it’s method and it’s uses.

The Anti-Cross site Scripting plugin is a single DLL, included in your project and referenced at the top of every controller in your MVC application. The DLL provides the ActionFilter Attribute for each route in your controller and only applies itself to POST methods, this alleviates the need for adding the attribute to each method that needs it, and also stops the possibility of missing out any POST requests that need protecting (they should all be protected!).
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16
Jan

Mvc Bundling and Minification issues with Google Chrome

Media Queries are now playing a vital role in web development. They allow web developers to adapt their website based on the device width, height, orientation and resolution. Up until now, media queries have been almost faultless if used properly, but with the latest update to Google Chrome, this is not the case.

 

The latest update to Google Chrome has prevented some minified CSS media queries to stop working completely. If your media queries contain the “and” rule and your CSS file is minified, likelihood is, your media queries won’t be working. This is due to Google Chrome becoming stricter on the syntax used by developers, which in understandable, Google Chrome has been trying to deliver the best possible browsing experience since its release.

 

Some minification libraries have put a fix in for this new scenario. The fix generally concerns the change in the media query syntax when minified. For example, if your media query was


@media screen (min-width:320px) and (max-width:530px) { }

 

It would be minified to:


@media screen (min-width:320px)and (max-width:530px) { }

 

The only difference is the space between the bracket “)” and the “and” rule. This is what Google Chrome is now rejecting as bad syntax and so will not be applied to the document.

 

One library which hasn’t yet released a fix for this is the .NET MVC library (System.Net.Web.Optimization). This is the default library used for minifcation and bundling in MVC websites. If you are using this library, you will have this problem. Luckily, I have devised a way to keep your minifcation and bundling without upsetting Google Chrome.

 

The method is simple, use the default CSSMinify() bundle transform, but after that add a second Transform instance to repair the damaged media queries. The code for this is below:

 


public class CssMinifyMQ : IBundleTransform

    {

        public void Process(BundleContext context, BundleResponse response)

        {

            response.ContentType = "text/css";

            response.Content = Regex.Replace(response.Content, "(\\)and( )?\\()", ") and (");

        }

    }

 

The method above is our second BundleTransform which will repair the broken media queries. This can be contained in the BundleConfig.cs file in the same namespace as your “BundleConfig” class.

 

To use this new BundleTransform your bundles will look like below. Note: If you are currently using “StyleBundle()” to create your CSS bundles, these will need changing to “Bundle()” instead.

 


bundles.Add(new Bundle("~/CSS/Base", new CssMinify(), new CssMinifyMQ())

                        .Include("~/Content/Base/*.css"));

I hope this helps some of the developers out there using Mvc and wanting the smallest file size while trying to please Google Chrome!

23
Dec

PHP Secure Sessions Class

When creating websites with multiple pages, sometimes it is a good idea to be passing information from page to page based on the current user. PHP holds a way of doing this called sessions. Sessions allow variables to be used across multiple pages while been set, modified and created. However, PHP sessions are not the most secure form of doing this.

In this tutorial we will look at a custom way of passing details from page to page without PHP sessions. To do this we will use cookies and a MySQL database. There will be hints throughout the tutorial on making classes/variables and functions or you can read the The full script is available at the end of this tutorial.

First, make a PHP file called “class.session.php”. This will contain all of the back end code for our class.

Start your class with a name of sessionsClass.

< ?php 
class sessionsClass
{
 
} 
?>

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19
Dec

Developing for the Nokia Lumia 1020 and Lumia 1520

New devices are getting released everyday, but there is a massive hype around the new Nokia Lumia devices, the 1020 and the 1520. The 1020 is currently known for its 41 megapixel camera, although the maximum resolution it will take is 38 megapixel, the results are phenomenal. Where as the 1520 is seen as an all around device, a “phablet”, a mixture of both the convenience of a phone but the practicality of a tablet.

When new devices emerge, the first questions for me and I’m sure many other is; what is it like to develop for, whats the viewport size, whats the screen resolution, what is the physical size of the screen. All these play a vital role in developing a usable website for the device.

Nokia Lumia 1020 1520 size Comparison

Nokia Lumia 1020 1520 size Comparison


The Devices
Today I have got my hands on a Nokia Lumia 1020 and a Nokia Lumia 1520. First impressions are WOW! The build quality is excellent and the camera on the Lumia 1020 is a very iconic image. The 1520 feels just the right size to be used with two hands, but not very usable with one hand. The 1020′s camera also adds a bevel to the back of the phone which causes it to be unbalanced if using it on a desk or any other flat surface. However the 1520 does not have this problem. Another interesting thing between the devices is the storage size. Both devices come with an intnernal memory of 32GB, which is a lot of storage for anyone, but the 1520 comes equipped with a micro-sd card slow to increase it by another 64GB. Where as the 1020 does not have this feature. But with the 1020 storing higher resolution photos, and thus taking more storage space, surely this device should have the capability to expand the storage space also.
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13
Dec

How to find Fragmented SQL Indexes

Storing data in SQL databases is easy, efficient and easily accessible. However, maintenance of these databases is crucial to keeping their performance good. One feature which helps SQL server to deliver large amounts of data quickly are indexes. These indexes store the relevant markers for pieces of data based on their values. These indexes, while constantly been updated can get fragmented, just like files on a hard drive. These indexes will only perform well if they are properly maintained.

Below is a handy bit of code to find out which indexes are fragmented and by how much. Based on this script, it can be extended to keep a record of index fragmentation and either REORGANIZE or REBUILD indexes based on their fragmentation level at certain times of the day.

SELECT OBJECT_NAME(ind.OBJECT_ID) AS TableName, 
ind.name AS IndexName, indexstats.index_type_desc AS IndexType, 
indexstats.avg_fragmentation_in_percent 
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) indexstats 
INNER JOIN sys.indexes ind  
ON ind.object_id = indexstats.object_id 
AND ind.index_id = indexstats.index_id 
WHERE indexstats.avg_fragmentation_in_percent > 0 
ORDER BY indexstats.avg_fragmentation_in_percent DESC
7
Dec

Serializing Exceptions in VB

No matter how hard you try to make an application completely bug and error free, at least one error will slip through the net. Catching them is relatively easy in .NET and many other languages with a try catch statement, but what you do with that error can be tricky, especially in production environments where debugging can’t occur.

The most efficient way of looking after errors on .NET applications is to store the whole exception object, rather than just the message, which can be very unhelpful at times. To do this easily, the storing of the object can be done in XML, and stored in a database, text file or even sent in an e-mail, that’s entirely up to you.

The method provided below (available in VB and C#) will take an exception and return a nicely formed XML string for all error details up to 3 levels deep.

Public Function GetExceptionSerialized(ByVal ex As Exception) As String
 
            ' Start XML string.
            Dim xmlString As String = ""
 
            ' See if we actually have an exception first.
            If ex IsNot Nothing Then
                xmlString = String.Format("<Exception>")
                ' See if we have a top level message.
                If ex.Message IsNot Nothing AndAlso ex.Message <> "" Then
                    xmlString += String.Format("<Message>{0}</Message>", ex.Message.ToString())
                    xmlString += String.Format("<Source></Source>", ex.Source.ToString())
                    xmlString += String.Format("<StackTrace></StackTrace>", ex.StackTrace.ToString())
                End If
                ' See if we have an inner exception.
                If ex.InnerException IsNot Nothing Then
                    xmlString += String.Format("<InnerException>")
                    If ex.InnerException.Message IsNot Nothing Then
                        xmlString += String.Format("<Message>{0}</Message>", ex.InnerException.Message)
                        xmlString += String.Format("<Source></Source>", ex.InnerException.Source.ToString())
                        xmlString += String.Format("<StackTrace></StackTrace>", ex.InnerException.StackTrace.ToString())
                    End If
                    If ex.InnerException.InnerException IsNot Nothing Then
                        xmlString += String.Format("<InnerException>")
                        If ex.InnerException.InnerException.Message IsNot Nothing Then
                            xmlString += String.Format("<Message>{0}</Message>", ex.InnerException.InnerException.Message)
                            xmlString += String.Format("<Source></Source>", ex.InnerException.InnerException.Source.ToString())
                            xmlString += String.Format("<StackTrace></StackTrace>", ex.InnerException.InnerException.StackTrace.ToString())
                        End If
                        xmlString += String.Format("</InnerException>")
                    End If
                    xmlString += String.Format("</InnerException>")
                End If
                xmlString = String.Format("</Exception>")
            End If
 
            ' Return the built string.
            Return xmlString
 
        End Function
22
Feb

Resize and Optimise Image Class in C#

With the growth of mobile internet and mobile devices, users want websites to be fast and responsive when they are using them. One main downfall of normal websites is the size of the web page and its resources. For mobile we should be reducing the number of requests and how big the responses are.

 

One method of doing this is to scale down your image before they are sent to the client. This prevents large images been downloaded, only to be displayed in a small space. If done properly it can also eliminate the request for the image using Data URIs.
This tutorial will show you how to create a C# class that will resize an image and return it in an optimised Data URI format.

 

To start with, create a new C# class file and call it “Resize”. This will contain all of our method to resize our images. Next we need to make our class public and static. Your class file should look as follows:

 
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21
Jan

How to target iPad mini in CSS Media Queries

With the increased use of the iPad mini, you need to be sure that your site displays well on the smaller screen. If you already have an iPad or tablet optimized website, the iPad mini will just inherit the same viewport size as the original iPad which is 768×1024 (in portrait mode) just in a smaller screen.

 

However, you may want to target the iPad mini specifically, due to it’s smaller screen, font’s may be slightly smaller and you may be able to utilize the space better. To do this, we can target the viewport size of the iPad coupled with the pixel density of the iPad mini.

 

So, in a media query we would do the following:

 

/* ipad Mini Portrait */
@media only screen and (width:768px) and (resolution: 163dpi) {
 
}
/* ipad Mini Landscape */
@media only screen and (width:1024px) and (resolution: 163dpi) {
 
}

 

The media queries above will allow you to target iPad Mini in both the portrait and landscape orientation. The landscape media query could be coupled with the normal iPad portrait rule as the size is very similar. To couple it with the normal iPad portrait query, you can use the code below:

 

/* All iPads Portrait & iPad Mini Landscape */
@media only screen and ((width:768px) and (resolution:132dpi or resolution:263px) or ((width:1024px) and (resolution: 163dpi)) {
 
}
 
/* Only iPad 1 & 2 Portrait & iPad Mini Landscape */
@media only screen and ((width:768px) and (resolution:132dpi) or ((width:1024px) and (resolution: 163dpi)) {
 
}

The reason for two options above, is you may want to target the retina iPad display seperatley to take care of high resolution images.

That is how to target iPad mini displays in CSS media queries.

10
Jan

Creating 3 Stage Pure CSS3 Gradients

With the ever growing popularity and ease of use of CSS3, it is important to use all of the benefits available from the technology. One of those benefits is being able to create gradients without the need for any images. This can be beneficial in 2 ways, one it means the gradient can be changed easily without having to make a new image, and two it eliminates the request for an image which helps in saving bandwidth.

 

Creating CSS3 gradient is easier than you expect and can take just one line of code, but cross browser comparability requires a few more lines to cater for vendor specific styles. This tutorial looks at how to create a 3 stage gradient. We will start by making an empty div in our html.

 

<div id="gradient"></div>

 

This div will be the based for displaying our gradient. Now we need to set our base background colour. This will be used for reference and also for comparability if any browsers don’t support CSS3 gradients. We will look at the simplest way to implement this gradient below:

 

background: -webkit-linear-gradient(top,#375C81 0%,#3E6992 50%,#375C81 100%);

 

The css style above is simply setting a background property, but instead of using an image or colour, we are defining a “-webkit-linear-gradient”. This is the property for any webkit browsers to render a linear gradient. First we tell it to start from the top with our background colour of #375C81 (at 0%). Then we tell it to use the colour #375C81 at 50% (half way) and then tell it to use the colour #375C81 again at 100%. This gives us our three stage gradient, top middle bottom. This syntax is used for a few vendors, so simply changing the vendor starting tag will allow you to support multiple browsers straight away.

 

background: -webkit-linear-gradient(top,#375C81 0%,#3E6992 50%,#375C81 100%);
background: -moz-linear-gradient(top,#375C81 0%,#3E6992 50%,#375C81 100%);
background: -o-linear-gradient(top,#375C81 0%,#3E6992 50%,#375C81 100%);
background: -ms-linear-gradient(top,#375C81 0%,#3E6992 50%,#375C81 100%);
background: linear-gradient(to bottom,#375C81 0%,#3E6992 50%,#375C81 100%);

 

There is one more style we need to include to ensure we support all webkit browsers. The syntax for this style is below and is almost the same as the previous examples.

 

background: -webkit-gradient(linear,left top,left bottom,color-stop(0%,#375C81),color-stop(50%,#3E6992),color-stop(100%,#375C81));

 

The main difference with the style above is we specify our starting point and end points before our colours. We specify a liner gradient to start at left top, and end at left bottom, this creates a veritcal gradient. Then we set our colours as before but using the in-built color-stop function.

 

To scale the gradient, we can change the “50%” value to a higher a lower percentage and based on that value we will see more or less of the top and bottom gradient colours.

 

Your result should look similar to the example below:

 

That is how to create a 3 stage gradient in pure CSS3. Another benefit of using CSS, is you can scale your gradient using the height and width of your div with no loss of quality and with no need for another image to be made.

28
Dec

Web Design for Mobiles and Tablets – Viewport Sizes

The web is evolving in many ways and the biggest is the mobile web. Mobiles are now browsing the web faster than every before and websites need to be optimized for smaller screen sizes, 3G connections and HD screens in the palms of people hands. When developing a mobile website, whether it be for an iPhone, iPad, Nexus 7 or a Samsung Tab 2, nearly every device has a different resolution and screen size. This can make it difficult to design a website that works on every device out there.

 

So, to make a start on creating a suitable website for all mobile devices (mobiles and tablets) it is a good idea to look at what screen sizes and resolutions are out there. Then you can get a good idea of how much space you have to work with, and if you possibly have to create a few different versions of the site to adapt to all devices.

 

So, below we have a table of all current mobile devices, including tablets, with their name, screen size, resolution and operating system version. This will be updated regularly when new devices are released. Use the search function to search for a specific phone or sort the columns by clicking them to find minimum and maximum values.

 


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