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using System;
using System.Threading;
using System.Text;
using System.IO;
using System.Web;
using System.Net;
using System.Collections.Specialized;
using Common;
namespace SQLiteTurbo
{
/// <summary>
/// Submits post data to a url.
/// </summary>
public class PostSubmitter
{
/// <summary>
/// determines what type of post to perform.
/// </summary>
public enum PostTypeEnum
{
/// <summary>
/// Does a get against the source.
/// </summary>
Get,
/// <summary>
/// Does a post against the source.
/// </summary>
Post
}
/// <summary>
/// Default constructor.
/// </summary>
public PostSubmitter()
{
}
/// <summary>
/// Constructor that accepts a url as a parameter
/// </summary>
/// <param name="url">The url where the post will be submitted to.</param>
public PostSubmitter(string url)
: this()
{
m_url = url;
}
/// <summary>
/// Constructor allowing the setting of the url and items to post.
/// </summary>
/// <param name="url">the url for the post.</param>
/// <param name="values">The values for the post.</param>
public PostSubmitter(string url, NameValueCollection values)
: this(url)
{
m_values = values;
}
/// <summary>
/// Gets or sets the url to submit the post to.
/// </summary>
public string Url
{
get
{
return m_url;
}
set
{
m_url = value;
}
}
/// <summary>
/// Gets or sets the name value collection of items to post.
/// </summary>
public NameValueCollection PostItems
{
get
{
return m_values;
}
set
{
m_values = value;
}
}
/// <summary>
/// Gets or sets the type of action to perform against the url.
/// </summary>
public PostTypeEnum Type
{
get
{
return m_type;
}
set
{
m_type = value;
}
}
/// <summary>
/// Cancels an on-going POST operation
/// </summary>
public void CancelPost()
{
lock (this)
{
if (_worker != null && _worker.IsAlive)
_worker.Interrupt();
} // lock
}
/// <summary>
/// Posts the supplied data to specified url.
/// </summary>
/// <returns>a string containing the result of the post.</returns>
public string Post()
{
StringBuilder parameters = new StringBuilder();
for (int i = 0; i < m_values.Count; i++)
{
EncodeAndAddItem(ref parameters, m_values.GetKey(i), m_values[i]);
}
string result = PostData(m_url, parameters.ToString());
return result;
}
/// <summary>
/// Posts the supplied data to specified url.
/// </summary>
/// <param name="url">The url to post to.</param>
/// <returns>a string containing the result of the post.</returns>
public string Post(string url)
{
m_url = url;
return this.Post();
}
/// <summary>
/// Posts the supplied data to specified url.
/// </summary>
/// <param name="url">The url to post to.</param>
/// <param name="values">The values to post.</param>
/// <returns>a string containing the result of the post.</returns>
public string Post(string url, NameValueCollection values)
{
m_values = values;
return this.Post(url);
}
/// <summary>
/// Posts data to a specified url. Note that this assumes that you have already url encoded the post data.
/// </summary>
/// <param name="postData">The data to post.</param>
/// <param name="url">the url to post to.</param>
/// <returns>Returns the result of the post.</returns>
private string PostData(string url, string postData)
{
lock (this)
{
if (_busy)
throw new InvalidOperationException("Another PostData operation is active");
_busy = true;
} // lock
string result = string.Empty;
bool cancelled = false;
Exception error = null;
_worker = new Thread(new ThreadStart(delegate
{
try
{
HttpWebRequest request = null;
if (m_type == PostTypeEnum.Post)
{
Uri uri = new Uri(url);
request = (HttpWebRequest)WebRequest.Create(uri);
request.Timeout = 10000;
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postData.Length;
using (Stream writeStream = request.GetRequestStream())
{
UTF8Encoding encoding = new UTF8Encoding();
byte[] bytes = encoding.GetBytes(postData);
writeStream.Write(bytes, 0, bytes.Length);
}
}
else
{
Uri uri = new Uri(url + "?" + postData);
request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "GET";
}
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
{
using (Stream responseStream = response.GetResponseStream())
{
using (StreamReader readStream = new StreamReader(responseStream, Encoding.UTF8))
{
result = readStream.ReadToEnd();
}
}
}
}
catch (ThreadInterruptedException tex)
{
cancelled = true;
} // catch
catch (Exception ex)
{
error = ex;
}
}));
try
{
_worker.IsBackground = true;
_worker.Name = "PostData Thread";
_worker.Start();
// Wait for the worker thread to complete
_worker.Join();
if (cancelled)
throw new UserCancellationException();
if (error != null)
throw error;
}
finally
{
lock (this)
_busy = false;
} // finally
return result;
}
/// <summary>
/// Encodes an item and ads it to the string.
/// </summary>
/// <param name="baseRequest">The previously encoded data.</param>
/// <param name="dataItem">The data to encode.</param>
/// <returns>A string containing the old data and the previously encoded data.</returns>
private void EncodeAndAddItem(ref StringBuilder baseRequest, string key, string dataItem)
{
if (baseRequest == null)
{
baseRequest = new StringBuilder();
}
if (baseRequest.Length != 0)
{
baseRequest.Append("&");
}
baseRequest.Append(key);
baseRequest.Append("=");
baseRequest.Append(System.Web.HttpUtility.UrlEncode(dataItem));
}
#region Private Variables
private string m_url = string.Empty;
private NameValueCollection m_values = new NameValueCollection();
private PostTypeEnum m_type = PostTypeEnum.Get;
private Thread _worker = null;
private bool _busy = false;
#endregion
}
}
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My name is Liron Levi and I'm developing software for fun & profit for 15 years already.