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In this post I will give one way, or my take on how-to integrate an external photo gallery seamless in to your website. Some of the advantage in doing this is you save room/space on your local webhost, and the load on the serve if you have large photo/images since these are not load in another thread on an external server. Off course there are disadvantage as well the gallery provide have to be online for this to work, and you have to maintain gallery content and web content on two different websites. On the other hand you if you choose one of the large providers flickr or picasa, you get some great photo gallery functionality tagging of images and galleries and more.

So i don't what to build the new Picasa or a like, so i will only provide functionality for showing frontend relevant images and associated information. In near future there will be a post on how-to use this post to integrate into Umbraco.

For this post i have chosen to integrate up against Google's Picasa so to start with you can go and download the google-gdata API you can get it here

The documentation i used to for making this post and code can be found here
The main idea for making this seamless is it could be easy to switch gallery provider from picasa to whatever your favorite web-photo gallery you use. Off course the difficulties you meet depend on how well an interface the provider gives you, you could end up in some tricky situations.

Okay let's get started. First of I've created the interfaces I've so necessary for making a good web gallery. You are more than welcome to give feedback if you think something are missing on one these.

There exist three parts. A gallery which consists of one or more photo albums. Next there off course a photo album which contain some album information and one or more Images. Last off is the image it self. So here are the three interfaces.

 

 
public interface IGallery
  {
    String Name { get; }
    String Description { get; }
    int NumberOfAlbums { get; }
    IEnumerable Albums{get;}
    IGalleryAlbum GetAlbumFromId(string id);
  } 

 
public interface IGalleryAlbum
  {
    String Id { get; }
    String Name{ get; }
    String Description { get; }
    String Category { get; }
    IGalleryImage AlbumCoverImage { get; }
    uint NumberOfImages { get; }
    IEnumerable Images { get; }
  }

 
 public interface IGalleryImage
  {
    String Name { get; }
    String Url { get; }
    String Description { get; }
    String ThumbnailUrl { get; }
    Dictionary ExifData { get; }
  }

Again you are more than welcome to give feedback if you think something is missing, keep in mind this is what I think is one a good and simple image gallery should be able to provide of information.
So now we have the interfaces in place lets go ahead an implement them using the Picasa API.
This is a pretty simple task if keep a window open with the documentation here is another link to the documentation
All I've used is the simple example provide at the documentation page.
First of the gallery implementation this is simple

namespace PicasaGalleryModel
{
  public class PicasaGallery : IGallery
  {
    private PicasaService _service;
    private PicasaFeed _feed;


    private const string PICASA_SERVICE_NAME = "PicasaIGalleryModel";

    public PicasaGallery(string username)
    {
      Username = username;
    }

    public string Name
    {
      get
      {
        return Feed.Title.Text;
      }
    }

    public string Description
    {
      get { return ""; }
    }

    public int NumberOfAlbums
    {
      get { return Albums.Count(); }
    }

    public IEnumerable Albums
    {
      get
      {
        return InitializeGalleryAlbumFromPicasaFeed(); 
      }
    }

     public IGalleryAlbum GetAlbumFromId(string id)
     {
       return Albums.Where(g => g.Id == id).First();
     }

    private PicasaFeed Feed
    {
      get
      {
        if (_feed == null)
          _feed = RetrieveUserAlbumsFromPicasa();
        return _feed;
      }
    }

    private PicasaFeed RetrieveUserAlbumsFromPicasa()
    {
      AlbumQuery query = new AlbumQuery(PicasaQuery.CreatePicasaUri(Username));
      PicasaFeed feed = Service.Query(query);
      return feed;
    }

    private IEnumerable InitializeGalleryAlbumFromPicasaFeed()
    {
      foreach (PicasaEntry entry in Feed.Entries)
      {
        IGalleryAlbum album = new PicasaAlbum(entry,Service,Username);
        yield return album;
      }

    }

    private PicasaService Service
    {
      get
      {
        if(_service == null)
          _service = new PicasaService(PICASA_SERVICE_NAME);
        return _service;
      }
    }

    private void Logon()
    {
    }

    protected string Password
    {
      get;
      set;
    }

    protected string Username
    {
      get; set ;
    }
  }
}

DO note that the username is the logon name you use to logon to picasa.
The implementation have some unused and unfinished function, when I first the idea to this post it started as huge project where I wanted security from picasa as well to be covered, in this implementation.
Wow this class uses the IGalleryAlbum so let's move on to the implantation of this.

namespace PicasaGalleryModel
{
  public class PicasaAlbum : IGalleryAlbum
  {
    private PicasaEntry _albumFeed;
    private PicasaFeed _imageFeed;
    private AlbumAccessor _ac;

    public PicasaAlbum(PicasaEntry feed,PicasaService service,string username)
    {
      AlbumFeed = feed;
      Service = service;
      Username = username;
    }

    public string Name
    {
      get { return AlbumAccessor.AlbumTitle; }
    }

    public string Description
    {
      get { return AlbumAccessor.AlbumSummary; }
    }

    public string Category
    {
      get { return "CAT-SET_STATIC"; }
    }

    public IGalleryImage AlbumCoverImage
    {
      get
      {
        PhotoQuery query = PhotoQueryFromUri(AlbumFeed.Id.AbsoluteUri);
        return BuildIGalleryImageFromPicasa(Service.Query(query)).First();
      }
    }

    private AlbumAccessor AlbumAccessor
    {
      get
      {
        if (_ac == null)
          _ac = new AlbumAccessor(AlbumFeed);
        return _ac;
      }
    }

    public uint NumberOfImages
    {
      get
      {
        
        return AlbumAccessor.NumPhotos;
      }
    }

    public IEnumerable Images
    {
      get 
      {
        return BuildIGalleryImageFromPicasa(ImageFeed);          
      }
    }

    private IEnumerable BuildIGalleryImageFromPicasa(PicasaFeed feed)
    {
      foreach (PicasaEntry entry in feed.Entries)
      {
        IGalleryImage image = new PicasaImage(entry);
        yield return image;
      }
    }

    public PicasaEntry AlbumFeed
    {
      get { return _albumFeed; }
      set { _albumFeed = value; }
    }

    public PicasaFeed ImageFeed
    {
      get
      {
        if(_imageFeed == null)
        {

          _imageFeed = Service.Query(PhotoQueryFromUri(PicasaImageUri()));
        }
        return _imageFeed;
      }
    }

    private string PicasaImageUri()
    {
      return PicasaQuery.CreatePicasaUri(Username, Id);;
    }

    private PhotoQuery PhotoQueryFromUri(string uri)
    {
      return new PhotoQuery(uri);
    }

    private PicasaService Service
    {
      get; set;
    }

    public String Id
    {
      get
      {
        return AlbumAccessor.Id;
      }
    }

    private string Username
    {
      get;
      set;
    }
  }
}

And now to the final part the Image implementation

namespace PicasaGalleryModel
{
  public class PicasaImage : IGalleryImage
  {

    private PhotoAccessor _photoAccessor;

    private Dictionary _exifData;

    public PicasaImage(PicasaEntry entry)
    {
      Entry = entry;
    }

    private PicasaEntry Entry
    {
      get;
      set;
    }

    public string Name
    {
      get
      {
        return PhotoAccessor.PhotoTitle;
      }
    }

    public string Url
    {
      get
      {
        return Entry.Media.Content.Attributes["url"].ToString();
      }
    }

    public string Description
    {
      get { return PhotoAccessor.PhotoSummary; }
    }

    public string ThumbnailUrl
    {
      get
      {
        return Entry.Media.Thumbnails[0].Attributes["url"].ToString();
      }
    }

    public Dictionary ExifData
    {
      get
      {
        if (_exifData == null)
          InitializeExifDataToDictionary();
        return _exifData;
      }
    }

    private void InitializeExifDataToDictionary()
    {
      _exifData = new Dictionary();
      _exifData.Add("Camera model", Entry.Exif.Model.Value);
      _exifData.Add("ISO", Entry.Exif.ISO.Value);
      _exifData.Add("Focal Length", Entry.Exif.FocalLength.Value);
      //_exifData.Add("Exposure", Entry.Exif.Exposure.Value);
      _exifData.Add("F Stop", Entry.Exif.FStop.Value);
      _exifData.Add("Flash", Entry.Exif.Flash.Value);
    }

    

    public PhotoAccessor PhotoAccessor
    {
      get
      {
        if(_photoAccessor == null)
          _photoAccessor = new PhotoAccessor(Entry);
        return _photoAccessor;
      }
    }

  }
}

Now with the model in place we can start to render out the IGallery* stuff.
This is made so it should be easy to integrate into Umbraco hence the MasterPage file.
The frontend stuff consist of the main gallery which loads in two different controls depending on you are viewing a list of albums or a list images in an album. The styling is left for you do, since this is dependent on your website design. If you like a can In a later post do this.
The main gallery

The .ascx page

<%@ Page Language="C#" MasterPageFile="~/Gallery.master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Presentation._Default" %>
<%@ Import Namespace="Interfaces" %>

<asp:Content ID="head" ContentPlaceHolderID="head" Runat="Server">
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript" src="js/jquery.lightbox-0.5.min.js"></script>
<script type="text/javascript" src="js/InitLightbox.js"></script>
<link rel="stylesheet" type="text/css" href="/CSS/jquery.lightbox-0.5.css" media="screen" />
</asp:Content>

<asp:Content ID="GalleryContent" ContentPlaceHolderID="GalleryContent" Runat="Server">

<div>
My Gallery Test

<asp:PlaceHolder ID="galleryContent" runat="server" />

</div>
</asp:Content>

 

and the codepage

public partial class _Default : System.Web.UI.Page
  {
    private IGallery _gallery;
    public const string ALBUMID = "aid";

    protected void Page_Load(object sender, EventArgs e)
    {

      SetGalleryContent();
    }

   

    private void SetGalleryContent()
    {
      Control view;
      if (String.IsNullOrEmpty(AlbumId))
        view = LoadGalleryView;
      else
        view = LoadAlbumView;
      galleryContent.Controls.Add(view);
    }

    private IEnumerable GalleryAlbums
    {
      get
      {
        return Gallery.Albums;
      }
    }

    private Control LoadGalleryView
    {
      get
      {
        Control viewControl = LoadControl("~/GalleryView.ascx");
        GalleryView gallery = (GalleryView)viewControl;
        gallery.AlbumQueryString = ALBUMID;
        gallery.GalleryAlbums = GalleryAlbums;
        return viewControl;
      }
    }

    private Control LoadAlbumView
    {
      get
      {
        Control viewControl = LoadControl("~/AlbumView.ascx");
        AlbumView gallery = (AlbumView)viewControl;
        gallery.Images = CurrentAlbum.Images ;
        return viewControl;
      }
    }

    private IGalleryAlbum CurrentAlbum
    {
      get
      {
        return Gallery.GetAlbumFromId(AlbumId);
      }
    }
    private string AlbumId
    {
      get
      {
        return Request.QueryString[ALBUMID];
      }
    }

    private IGallery Gallery
    {
      get
      {
        if(_gallery == null)
          _gallery = new PicasaGallery("USERNAME_GOES_HERE");
        return _gallery;
      }
    }
  }

The List view of albums
Ascx page

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="GalleryView.ascx.cs" Inherits="Presentation.GalleryView" %>
<%@ Import Namespace="Interfaces"%>

<asp:Repeater runat="server" ID="AlbumeRepeater" DataSource="<%# GalleryAlbums %>">
<ItemTemplate>
<div class="AlbumCoverImage">
<a href="<%# AlbumLink(((IGalleryAlbum)Container.DataItem).Id) %>" >
<img src="<%# ((IGalleryAlbum)Container.DataItem).AlbumCoverImage.ThumbnailUrl %>" alt="" />
</a>
</div>
<div class="AlbumTitle">
<a href="<%# AlbumLink(((IGalleryAlbum)Container.DataItem).Id) %>" >
<%# ((IGalleryAlbum)Container.DataItem).Name %>
</a>
</div>
<div class="ImageCountInAlbum">
<%# ((IGalleryAlbum)Container.DataItem).NumberOfImages %>
</div>
<div class="AlbumDescription">
<%# ((IGalleryAlbum)Container.DataItem).Description%>
</div>

</ItemTemplate>
</asp:Repeater>

 

Codepage

public partial class GalleryView : System.Web.UI.UserControl
  {
    protected void Page_Load(object sender, EventArgs e)
    {
      AlbumeRepeater.DataBind();
    }

    public string AlbumLink(string albumId)
    {
      string url = String.Format("{0}{1}={2}", Request.RawUrl, AlbumQueryString, albumId);
      return url;
    }

    public string AlbumQueryString
    {
      get; set;
    }

    public IEnumerable GalleryAlbums
    {
      get;
      set;
    }

  }

And finally the list view of images in an album
Ascx page

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="AlbumView.ascx.cs" Inherits="Presentation.AlbumView" %>
<%@ Import Namespace="Interfaces"%>
<asp:Repeater ID="ImageRepeater" runat="server" DataSource="<%#Images %>">
<HeaderTemplate>
<ul id="Gallery">
</HeaderTemplate>
<ItemTemplate>
<li>
<a href="<%# ((IGalleryImage)Container.DataItem).Url %>" class="lightbox" title="<%# ExifData((IGalleryImage)Container.DataItem)%>"><img src="<%# ((IGalleryImage)Container.DataItem).ThumbnailUrl %>" /></a>

</li>
</ItemTemplate>
<FooterTemplate>
</ul>
</FooterTemplate>
</asp:Repeater>

codefile

public partial class AlbumView : System.Web.UI.UserControl
  {
    protected void Page_Load(object sender, EventArgs e)
    {
      ImageRepeater.DataBind();
    }

    public string ExifData(IGalleryImage image)
    {
      string exifData = "";
      foreach(string key in image.ExifData.Keys)
      {
        exifData += string.Format("{0} : {1}

", key, image.ExifData[key]);
      }
      return exifData;
    }

    public IEnumerable Images
    {
      get;
      set;
    }
  }

The final part is using the jquery lightbox again you could switch this to you own favorite gallery viewing service the lightbox for jquery can be found here. I've extend this a bit so you can provide a max image height and max image width, both are found in the solution for this project.
And a service for my loyal readers, you can now download the entire solution which contains all the above models implementations, and all the other good stuff I've covered in this post. Now you can get HERE, Rememer to fill out your own Username

And now you can head over and see when this is integrated into umbraco, i've done this for my site here is a like to my gallery

 

So after i my self got spammed by a lot of robots on my blog i browsed the internet to find an easy way to add captcha for the comment part of my blog.

So i found the easiest way to do was using recaptcha, which can be found here recaptcha.net. So before we start head over there and create an account.

Step 1:

Create recaptcha.net account  recaptcha.net

 

Step 2:

Download the .Net package containing the recaptcha.dll

 

Step 3:

Download from you site frmBlogComment.ascx placed in siteroot/usercontrols

 

Step4:

Edit frmBlogComment.ascx

add the following lines

 

<%@ Import Namespace="Recaptcha">
<%@ Register TagPrefix="recaptcha" Namespace="Recaptcha" Assembly="Recaptcha">

void btnSubmit_Click1(object sender, EventArgs args)
{
  if (recaptcha.IsValid)
  {
     btnSubmit_Click(sender,args);
  }
}

These lines should be right after the "control tag" "<%@ Control ...... %>"

 

Futher down you can now add the recaptcha usercontrol

<recaptcha:RecaptchaControl
ID="recaptcha"
runat="server"
PublicKey=...
PrivateKey=....
/>

 

ofcourse with your privatekey and publickey..

 

Step 5:

Upload recaptcha.dll to your webroot/bin

Upload the newly edited  frmBlogComment.ascx to you webroot/usercontrols/

 

And you should be all done and no more bots should spam your blog I hope.

This post is for them that dont want to recompile umbraco, it would be a much better solution to add an reference to the recaptcha.dll

 

Topic: How to encrypt and sign mail c#. Signed mail in c#, signing c#, c# send encrypted mail, signed encrypted mail c#, S/MIME messages,Sending encrypted email - C#

Final part in the serie c# encrypting mail.

 

So now we got the content build and signed. Now what is left to do i encrypting the content.

In this post we have a look at how the structure of the content should just before it is encrypted, and how to encrypt the content.

Link to part 1, part 2, part 3, part 4

To encrypt the content I will use the GetCert method that we did in part 4 of this series.

As with the signing part we will split this encryption into two bits. adding boundary to the content and encrypting part.

First the encrypting part:

 

 

 public byte[] DoEncrypt(string message, X509Certificate2 encryptionCertificates)
           {
               byte[] messageBytes = Encoding.ASCII.GetBytes(message);

               EnvelopedCms envelopedCms = new EnvelopedCms(new ContentInfo(messageBytes));

               CmsRecipient recipients = new CmsRecipient(SubjectIdentifierType.IssuerAndSerialNumber, encryptionCertificates);

               envelopedCms.Encrypt(recipients); 

               return envelopedCms.Encode();
           }

 

 

With this function done we can now ready the content for encryptions. We add a simple boundary to the content and specifies what type the innner boundary is of. Important that if you skipped the signing part that you change this accordingly to match the type of you content.

Here is the code for encrypting and sending the mail:

 

 

 public void encrypt(string content)
       {
           MailMessage message = new System.Net.Mail.MailMessage();
           string encryptedContentType = "application/x-pkcs7-mime; smime-type=enveloped-data; name=\"smime.p7m\"";
           string signatureBoundry2 = "--PTBoundry=3";
           StringBuilder fullUnencryptedMessageBuilder = new StringBuilder();
           fullUnencryptedMessageBuilder.Append("Content-Type: ");
           fullUnencryptedMessageBuilder.Append("multipart/signed; ");
           fullUnencryptedMessageBuilder.Append(" boundary=\"");
           fullUnencryptedMessageBuilder.Append(signatureBoundry2);
             fullUnencryptedMessageBuilder.Append("\"; protocol=\"application/x-pkcs7-signature\"; micalg=SHA1; ");
           
           fullUnencryptedMessageBuilder.Append("\r\n");
           fullUnencryptedMessageBuilder.Append("Content-Transfer-Encoding: ");
           fullUnencryptedMessageBuilder.Append(TransferEncoding.SevenBit);
           fullUnencryptedMessageBuilder.Append("\r\n\r\n");
           fullUnencryptedMessageBuilder.Append(content); 

           string fullUnencryptedMessage = fullUnencryptedMessageBuilder.ToString();

           byte[] encryptedBytes = DoEncrypt(fullUnencryptedMessage, GetCert());

           MemoryStream stream = new MemoryStream(encryptedBytes);
           AlternateView view = new AlternateView(stream, "application/pkcs7-mime; smime-type=signed-data;name=smime.p7m");
           message.AlternateViews.Add(view);
           message.To.Add("youremail@yourdomain.com");
        
           message.From = new MailAddress("someone@yourdomain.com");
           message.Subject = "TEST";
           SmtpClient smtp = new SmtpClient("smtp.yourdomain.com");
           smtp.Send(message);

       
       }

 

 

This function also sends out the mail you might wanna spilt this up to seperate methods. And do remember to give valide email adresses and a sane smtphost.

Now lets have a look at the result:

 

 

Yes there is a warning with the signature but rember in part 1 where did a selfsigned certificate this is the problem, but you cal always just accept the signature as trusted in your outlook.

Okay so how doesn't the content that we build look like just before it is encrypted ?

If hightligthe the different steps we done in this series.

 

link to image

Also note the diffenrent boundary references from one part to underlaying content part.

you can find the code file for this project in the download section here is a link.

Rememer to change email smtp host and serial for certificat

Note you should implement all the explained methods in nice class's that wraps all this functionality into one simple class. The code file you can download is constructed as a simple file so i would be easier to explain howto encrypt and sign emails. It is not intended to be used for production purposes.

Finished you now know ho to encrypt and sign mails with c#.

c# encrypting and signing mail