private string GetTimelineData(HttpContext context)
{
try
{
JavaScriptSerializer serializer = new JavaScriptSerializer();
TimelineParams inputParams = new TimelineParams();
if (context.Request.Params["inputParameters"] != null)
{
string jsonInput = HttpUtility.HtmlDecode(context.Request.Params["inputParameters"]);
inputParams = serializer.Deserialize<TimelineParams>(jsonInput);
}
if (string.IsNullOrEmpty(inputParams.ListName))
return serializer.Serialize(TimelineHelper.GetUserTimeline(inputParams));
else
return serializer.Serialize(TimelineHelper.GetList(inputParams));
}
catch(Exception ex)
{
context.Response.StatusCode = 500;
return string.Format("Error retrieving timeline: '{0}'", ex.Message);
}
}
internal static string BuildAsyncTimelineOutput(TimelineParams inputParams, string CssClass)
{
string asyncBaseHtml = ResourceHelper.Includes(null, "async-base.html");
JavaScriptSerializer serializer = new JavaScriptSerializer();
asyncBaseHtml = string.Format(asyncBaseHtml, VirtualPathUtility.ToAbsolute(ConfigHelper.GetAppSettingString(ConfigKey.HandlerPath, Constants.Configuration.HandlerPath)), serializer.Serialize(inputParams), CssClass);
return asyncBaseHtml;
}
internal static string RenderTimelineIncludes(TimelineParams inputParams, string CssClass = "tweet-container", bool isAsync = false)
{
RoutingHelper.RegisterRoutes();
if (isAsync)
return BuildAsyncTimelineOutput(inputParams, CssClass);
else
return BuildTimelineOutput(inputParams, CssClass);
}
/// <summary>
/// Public method to build timeline output to be consumed by page.
/// </summary>
/// <param name="tweetCount"></param>
/// <param name="showReplies"></param>
/// <param name="includeRetweets"></param>
/// <param name="screenName"></param>
/// <param name="listName"></param>
/// <param name="CssClass"></param>
/// <param name="isAsync"></param>
/// <returns>A string containing the html to output to the page</returns>
public static string RenderTimelineIncludes(int tweetCount, bool showReplies, bool includeRetweets, string screenName = null, string listName = null, string CssClass = "tweet-container", bool isAsync = false)
{
TimelineParams inputParams = new TimelineParams();
inputParams.TweetCount = tweetCount;
inputParams.ShowReplies = showReplies;
inputParams.ScreenName = screenName;
inputParams.ListName = listName;
inputParams.IncludeRetweets = includeRetweets;
return RenderTimelineIncludes(inputParams, CssClass, isAsync);
}
/// <summary>
/// Gets a timeline collection based on the supplied parameters and builds the html for output
/// </summary>
/// <param name="tweetCount"></param>
/// <param name="showReplies"></param>
/// <param name="screenName"></param>
/// <param name="CssClass"></param>
/// <returns></returns>
public static string BuildTimelineOutput(TimelineParams inputParams, string CssClass = "tweet-container")
{
//string htmlBase = ResourceHelper.Includes(null, "tweet-layout.html");
//Regex placeHolderExp = new Regex(@"(?<=\{)[\w\.]+(:\w+)?(?=\})");
StringBuilder tweetBuilder = new StringBuilder();
try
{
tweetBuilder.AppendLine(string.Format("<div class='{0}'>", CssClass));
tweetBuilder.AppendLine("<ul>");
List<Status> tweets;
if (string.IsNullOrEmpty(inputParams.ListName))
tweets = TimelineHelper.GetUserTimeline(inputParams);
else
tweets = TimelineHelper.GetList(inputParams);
if (tweets != null && tweets.Count > 0)
{
foreach (Status tweet in tweets)
{
DateTime tweetCreated = tweet.CreatedAt.ToLocalTime();
//string tweetOutput = htmlBase;
//Match match = placeHolderExp.Match(tweetOutput);
//while (match != null)
//{
// MapTweetToHtml(tweet, tweetOutput, match.Value);
// match = match.NextMatch();
//}
tweetBuilder.AppendLine("<li>");
tweetBuilder.AppendLine("<div class='user-container'>");
tweetBuilder.AppendLine(string.Format("<a class='user-link' href='{0}{1}' target='_blank'>", Constants.Configuration.TwitterUrl, tweet.User.Identifier.ScreenName));
tweetBuilder.AppendLine(string.Format("<img class='user-image' src='{0}' />", tweet.User.ProfileImageUrl));
tweetBuilder.AppendLine("</a>");
tweetBuilder.AppendLine("</div>");
tweetBuilder.AppendLine("<div class='tweet-container'>");
tweetBuilder.AppendLine(string.Format("<a class='tweet-screenName' href='{0}{1}' target='_blank'>{1}</a>", Constants.Configuration.TwitterUrl, tweet.User.Identifier.ScreenName));
tweetBuilder.AppendLine(string.Format("<p class='tweet-content'>{0}</p>", ParseTweetText(tweet.Text)));
tweetBuilder.AppendLine(string.Format("<span class='tweet-date'>{0}</span>", tweetCreated.ToString("dd MMM yyyy")));
tweetBuilder.AppendLine(string.Format("<span class='tweet-time'>{0}</span>", tweetCreated.ToString("hh:mm:ss")));
tweetBuilder.AppendLine(string.Format("<span class='tweet-time-passed'>{0}</span>", GetTimePassed(tweetCreated)));
tweetBuilder.AppendLine("</div>");
tweetBuilder.AppendLine("</li>");
}
}
tweetBuilder.AppendLine("</ul>");
tweetBuilder.AppendLine("</div>");
}
catch
{
return "<p class='service-error'>Unable to contact twitter service.</p>";
}
return tweetBuilder.ToString();
}
/// <summary>
/// Builds a parameter string to use as part of the cache key
/// </summary>
/// <returns></returns>
private static string BuildParamString(TimelineParams inputParams)
{
return string.Format("TweetCount={0}&ShowReplies={1}&ScreenName={2}&IncludeRetweets={3}&ListName={4}", inputParams.TweetCount, inputParams.ShowReplies, inputParams.ScreenName, inputParams.IncludeRetweets, inputParams.ListName);
}
/// <summary>
/// calls the twitter api to get timeline results for a user
/// </summary>
/// <returns></returns>
public static List<Status> GetUserTimeline(TimelineParams inputParams)
{
// check the cache for existing data
List<Status> tweets = (List<Status>)CacheHelper.GetFromCache(CacheKey.UserTimeline, BuildParamString(inputParams));
if (tweets == null)
{
tweets = new List<Status>();
ulong lastTweetId = 0;
string searchScreenName;
// a valid context
TwitterContext context = ContextHelper.GetContext();
// if a screen name has not been provided then get the current users screen name and last tweet id
if (string.IsNullOrEmpty(inputParams.ScreenName))
{
User authenticatedUser = ContextHelper.GetAuthenticatedUser();
searchScreenName = authenticatedUser.Identifier.ScreenName;
if (authenticatedUser.Status != null)
lastTweetId = ulong.Parse(authenticatedUser.Status.StatusID);
}
// if a screen name has been provided then get the user and store thier last tweet id
else
{
searchScreenName = inputParams.ScreenName;
var users = from u in context.User
where u.Type == UserType.Show
&& u.ScreenName == inputParams.ScreenName
select u;
User user = users.SingleOrDefault();
lastTweetId = ulong.Parse(user.Status.StatusID);
}
try
{
// Here it is necesary to get the tweets in chunks and add the results to the tweets list
// as the number of results returned from the api call is effectively up to the count supplied
// due to limitations in the twitter REST api
//set a max loops value as a backup
int maxloops = 5, count = 0;
while (tweets.Count < inputParams.TweetCount && count < maxloops)
{
//increment the count
count++;
List<Status> chunkList;
chunkList = (from tweet in context.Status
where tweet.Type == StatusType.User
&& tweet.ExcludeReplies == !inputParams.ShowReplies
&& tweet.IncludeRetweets == inputParams.IncludeRetweets
&& tweet.Count == inputParams.TweetCount
&& tweet.ScreenName == searchScreenName
&& tweet.MaxID == lastTweetId
orderby tweet.CreatedAt descending
select tweet).ToList();
// add the chunk items into the tweet list
foreach (Status tweet in chunkList)
{
if (tweets.Count < inputParams.TweetCount)
{
tweets.Add(tweet);
}
}
// store the last tweet recieved so we dont get the same ones next loop (-1 to prevent re-retrieving the last tweet)
if (tweets.Count > 0)
lastTweetId = ulong.Parse(chunkList[chunkList.Count - 1].StatusID) - 1;
}
CacheHelper.AddToCache(tweets, ConfigHelper.GetAppSetting<int>(ConfigKey.TwitterCacheDuration, 20), CacheKey.UserTimeline, BuildParamString(inputParams));
}
catch (TwitterQueryException ex)
{
}
}
return tweets;
}
/// <summary>
/// calls the twitter api to get tweets form a list
/// </summary>
/// <returns></returns>
public static List<Status> GetList(TimelineParams inputParams)
{
// check the cache for existing data
List<Status> tweets = (List<Status>)CacheHelper.GetFromCache(CacheKey.UserTimeline, BuildParamString(inputParams));
if (tweets == null)
{
tweets = new List<Status>();
string searchScreenName = inputParams.ScreenName;
ulong lastTweetId = 0;
// a valid context
TwitterContext context = ContextHelper.GetContext();
// if a screen name has not been provided then get the current users screen name
if (string.IsNullOrEmpty(inputParams.ScreenName))
{
User authenticatedUser = ContextHelper.GetAuthenticatedUser();
searchScreenName = authenticatedUser.Identifier.ScreenName;
}
try
{
// Here it is necesary to get the tweets in chunks and add the results to the tweets list
// as the number of results returned from the api call is effectively up to the count supplied
// due to limitations in the twitter REST api
//set a max loops value as a backup
int maxloops = 5, count = 0;
while (tweets.Count < inputParams.TweetCount && count < maxloops)
{
//increment the count
count++;
List<Status> chunkList;
if (lastTweetId == 0)
{
chunkList = (from list in context.List
where list.Type == ListType.Statuses
&& list.OwnerScreenName == searchScreenName
&& list.Slug == inputParams.ListName // name of list to get statuses for
&& list.Count == inputParams.TweetCount
select list)
.First().Statuses;
}
else
{
chunkList = (from list in context.List
where list.Type == ListType.Statuses
&& list.OwnerScreenName == searchScreenName
&& list.Slug == inputParams.ListName // name of list to get statuses for
&& list.Count == inputParams.TweetCount
&& list.MaxID == lastTweetId
select list)
.First().Statuses;
}
// add the chunk items into the tweet list
foreach (Status tweet in chunkList)
{
if (tweets.Count < inputParams.TweetCount && (inputParams.IncludeRetweets || (tweet.RetweetedStatus == null || tweet.RetweetedStatus.User == null)))
{
tweets.Add(tweet);
}
}
// store the last tweet recieved so we dont get the same ones next loop (-1 to prevent re-retrieving the last tweet)
if (tweets.Count > 0)
lastTweetId = ulong.Parse(chunkList[chunkList.Count - 1].StatusID) - 1;
}
CacheHelper.AddToCache(tweets, ConfigHelper.GetAppSetting<int>(ConfigKey.TwitterCacheDuration, 20), CacheKey.UserTimeline, BuildParamString(inputParams));
}
catch (TwitterQueryException ex)
{
}
}
return tweets;
}
protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
TimelineParams inputParams = new TimelineParams();
inputParams.TweetCount = TweetCount;
inputParams.ShowReplies = ShowReplies;
inputParams.ScreenName = ScreenName;
inputParams.IncludeRetweets = ShowRetweets;
inputParams.ListName = ListName;
writer.Write(HtmlHelper.RenderTimelineIncludes(inputParams, CssClass, IsAsync));
}