TwitterFeed.cshtml

@inherits umbraco.MacroEngines.DynamicNodeContext


@{   
    @*
    Macro Parameters To Create
    Show:True   Alias:twitterUsername       Name:Twitter Username       Type:Textstring     Defaults to: umbraco
    Show:True   Alias:includeRTs            Name:Include Retweets       Type:Textstring     Defaults to: false
    Show:True   Alias:excludeReplies        Name:Exclude Replies        Type:Textstring     Defaults to: false
    Show:True   Alias:noTweets              Name:Number of Tweets       Type:Integer        Defaults to: 1
    *@
    
    var twitterUsername = String.IsNullOrEmpty(Parameter.twitterUsername) ? "umbraco" : Parameter.twitterUsername;
    var includeRTs      = String.IsNullOrEmpty(Parameter.includeRTs) ? false : Parameter.includeRTs;
    var excludeReplies  = String.IsNullOrEmpty(Parameter.excludeReplies) ? false : Parameter.excludeReplies;
    var noTweets        = String.IsNullOrEmpty(Parameter.noTweets) ? 1 : Parameter.noTweets;
    

    @* Twitter JSON URL *@
    var twitterURL = string.Format(
            "https://api.twitter.com/1/statuses/user_timeline.json?screen_name={0}&include_rts={1}&exclude_replies={2}&include_entities=1&count={3}",
            twitterUsername,
            includeRTs,
            excludeReplies,
            noTweets);                
}


@* Fetch the JSON from Twitters API *@
@using (var client = new System.Net.WebClient())
{
    @* Fetch the JSON from Twitter *@
    var response = client.DownloadString(new Uri(twitterURL));

    @* Decode the JSON so we can interate over it *@
    var tweets = Json.Decode(response);
    
    <ul>    
        @foreach (var tweet in tweets)
        {
            <li>
                @* Tweet with formatted links *@
                <h3>@formatLinks(tweet.text, tweet.entities)</h3>

                <p>
                    @* Format Tweet Date and ouput as 24/03/12 @14:05 *@
                    <em>@formatDate(tweet.created_at).ToString("dd/MM/yy @ HH:mm")</em>
                </p>

                <p>
                    @* Profile Image *@
                    <img src="@tweet.user.profile_image_url" alt="@tweet.user.Name" />
                
                    @* Your real name (not profile name) *@
                    <strong>@tweet.user.name</strong>
                </p>

                @* Google Map (if tweet has geo info) *@
                @if (tweet.geo != null)
                {
                    @Html.Raw(displayMap(tweet.geo));
                }                

                @* Dislay Image (if tweet has image attached *@
                @if (tweet.entities.media != null)
                {
                    <a href="@tweet.entities.media[0].media_url" target="_blank">
                        <img src="@tweet.entities.media[0].media_url:thumb" />
                    </a>
                }
            </li>
        }
    </ul>
}

@functions
{
    DateTime formatDate(string twitterDate)
    {
        //Example tweet date
        //Fri Mar 02 16:09:35 +0000 2012
        //ddd MMM dd HH:mm:ss zz00 yyyy
        DateTime tweetDate = DateTime.ParseExact(twitterDate, "ddd MMM dd HH:mm:ss zz00 yyyy", null);

        return tweetDate;
    }

    String displayMap(dynamic geo)
    {
        //Get the lat & long values
        var tweetLat = geo.coordinates[0];
        var tweetLong = geo.coordinates[1];

        //Format the string to return the image
        var googleMap = string.Format("http://maps.googleapis.com/maps/api/staticmap?center={0},{1}&zoom=14&size=250x250&maptype=roadmap&sensor=false&markers={0}, {1}", tweetLat, tweetLong);
        var mapImage = string.Format("<img src='{0}' alt='map' />", googleMap);

        return mapImage;
    }

    IHtmlString formatLinks(string tweet, dynamic entities)
    {
        //A List of tweet entities so we can sort all of them
        IList<tweetEntity> tweetEntities = new List<tweetEntity>();

        //Get URLs
        var links = entities.urls;

        //Check we have links to loop over
        if (links != null)
        {
            //For each link in the collection of links
            foreach (var link in links)
            {
                var startPosition = link.indices[0];
                var endPosition = link.indices[1];
                var length = endPosition - startPosition;

                var url = link.url;         //The short t.co link
                var displayURL = link.display_url; //A friendly version of the full link (may be truncated)

                var newText = string.Format("<a href='{0}' target='_blank'>{1}</a>", url, displayURL);
                var oldText = tweet.Substring(startPosition, length);


                //Create a new entity
                tweetEntity entity = new tweetEntity();
                entity.startPosition = startPosition;
                entity.endPosition = endPosition;
                entity.newText = newText;
                entity.oldText = oldText;

                //Add it to the collection
                tweetEntities.Add(entity);
            }
        }


        //Get user mentions (@umbraco)
        var mentions = entities.user_mentions;

        //Check we have mentions to loop over
        if (mentions != null)
        {
            //For each mention in the collection of mentions
            foreach (var mention in mentions)
            {
                var startPosition = mention.indices[0];
                var endPosition = mention.indices[1];
                var length = endPosition - startPosition;

                var username = mention.screen_name;

                var newText = string.Format("<a href='http://twitter.com/{0}' target='_blank'>@{0}</a>", username);
                var oldText = tweet.Substring(startPosition, length);

                //Create a new entity
                tweetEntity entity = new tweetEntity();
                entity.startPosition = startPosition;
                entity.endPosition = endPosition;
                entity.newText = newText;
                entity.oldText = oldText;

                //Add to collection
                tweetEntities.Add(entity);
            }
        }

        //Get hashtags
        var hashtags = entities.hashtags;

        //Check we have hash to loop over
        if (hashtags != null)
        {
            foreach (var hash in hashtags)
            {
                var startPosition = hash.indices[0];
                var endPosition = hash.indices[1];
                var length = endPosition - startPosition;
                var hashtag = hash.text;

                var newText = string.Format("<a href='http://twitter.com/search/%23{0}' target='_blank'>#{0}</a>", hashtag);
                var oldText = tweet.Substring(startPosition, length);

                //Create a new entity
                tweetEntity entity = new tweetEntity();
                entity.startPosition = startPosition;
                entity.endPosition = endPosition;
                entity.newText = newText;
                entity.oldText = oldText;

                //Add to collection
                tweetEntities.Add(entity);
            }
        }

        //For each item in the tweet entities in reverse order
        //If we update the string in reverse order the remaining start/end indexs will still be correct
        foreach (var item in tweetEntities.OrderByDescending(x => x.startPosition))
        {
            //Lets update the tweet text
            tweet = tweet.Replace(item.oldText, item.newText);
        }


        //Return the new tweet with all the links added in
        return Html.Raw(tweet);
    }

    public class tweetEntity
    {
        public int startPosition { get; set; }
        public int endPosition { get; set; }
        public string oldText { get; set; }
        public string newText { get; set; }
    }
}