/// <summary>
/// Creates a <see cref="XPathNavigator"/> against the supplied <see cref="Stream"/>.
/// </summary>
/// <param name="stream">The <see cref="Stream"/> object that contains the XML data to be navigated by the created <see cref="XPathNavigator"/>.</param>
/// <returns>
/// An <see cref="XPathNavigator"/> that provides a cursor model for navigating the supplied <paramref name="stream"/>.
/// The supplied <paramref name="stream"/> XML data is parsed to remove invalid XML characters that would normally prevent
/// a navigator from being created.
/// </returns>
/// <remarks>
/// The character encoding of the supplied <paramref name="stream"/> is automatically determined based on the <i>encoding</i> attribute of the XML document declaration.
/// If the character encoding cannot be determined, a default encoding of <see cref="Encoding.UTF8"/> is used.
/// </remarks>
/// <exception cref="ArgumentNullException">The <paramref name="stream"/> is a null reference (Nothing in Visual Basic).</exception>
public static XPathNavigator CreateSafeNavigator(Stream stream)
{
//------------------------------------------------------------
// Local members
//------------------------------------------------------------
Encoding encoding = Encoding.UTF8;
byte[] buffer = null;
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
Guard.ArgumentNotNull(stream, "stream");
//------------------------------------------------------------
// Extract stream data as an array of bytes
//------------------------------------------------------------
buffer = SyndicationEncodingUtility.GetStreamBytes(stream);
//------------------------------------------------------------
// Determine encoding of the XML data
//------------------------------------------------------------
encoding = SyndicationEncodingUtility.GetXmlEncoding(buffer);
//------------------------------------------------------------
// Attempt to return navigator for supplied stream
//------------------------------------------------------------
using (MemoryStream memoryStream = new MemoryStream(buffer))
{
return(SyndicationEncodingUtility.CreateSafeNavigator(memoryStream, encoding));
}
}
/// <summary>
/// Creates a <see cref="XPathNavigator"/> against the supplied <see cref="Uri"/> using the specified <see cref="ICredentials">credentials</see> and <see cref="IWebProxy">proxy</see>.
/// </summary>
/// <param name="source">A <see cref="Uri"/> that points to the location of the XML data to be navigated by the created <see cref="XPathNavigator"/>.</param>
/// <param name="credentials">
/// A <see cref="ICredentials"/> that provides the proper set of credentials to the <paramref name="source"/> resource when required.
/// If <paramref name="credentials"/> is <b>null</b>, request is made using the default application credentials.
/// </param>
/// <param name="proxy">
/// A <see cref="IWebProxy"/> that provides proxy access to the <paramref name="source"/> resource when required.
/// If <paramref name="proxy"/> is <b>null</b>, request is made using the <see cref="WebRequest"/> default proxy settings.
/// </param>
/// <param name="encoding">A <see cref="Encoding"/> object that indicates the expected character encoding of the supplied <paramref name="source"/>. This value can be <b>null</b>.</param>
/// <returns>
/// An <see cref="XPathNavigator"/> that provides a cursor model for navigating the supplied <paramref name="source"/>.
/// The supplied <paramref name="source"/> XML data is parsed to remove invalid XML characters that would normally prevent
/// a navigator from being created.
/// </returns>
/// <remarks>
/// If the <paramref name="encoding"/> is <b>null</b>, the character encoding of the supplied <paramref name="source"/> is determined automatically.
/// Otherwise the specified <paramref name="encoding"/> is used when reading the XML data represented by the supplied <paramref name="source"/>.
/// </remarks>
/// <exception cref="ArgumentNullException">The <paramref name="source"/> is a null reference (Nothing in Visual Basic).</exception>
public static XPathNavigator CreateSafeNavigator(Uri source, ICredentials credentials, IWebProxy proxy, Encoding encoding)
{
//------------------------------------------------------------
// Create safe navigator using the specified encoding
//------------------------------------------------------------
return(SyndicationEncodingUtility.CreateSafeNavigator(source, new WebRequestOptions(credentials, proxy), encoding));
}
/// <summary>
/// Creates a <see cref="XPathNavigator"/> against the supplied <see cref="Uri"/> using the specified <see cref="ICredentials">credentials</see> and <see cref="IWebProxy">proxy</see>.
/// </summary>
/// <param name="source">A <see cref="Uri"/> that points to the location of the XML data to be navigated by the created <see cref="XPathNavigator"/>.</param>
/// <param name="options">A <see cref="WebRequestOptions"/> that holds options that should be applied to web requests.</param>
/// <returns>
/// An <see cref="XPathNavigator"/> that provides a cursor model for navigating the supplied <paramref name="source"/>.
/// The supplied <paramref name="source"/> XML data is parsed to remove invalid XML characters that would normally prevent
/// a navigator from being created.
/// </returns>
/// <exception cref="ArgumentNullException">The <paramref name="source"/> is a null reference (Nothing in Visual Basic).</exception>
public static XPathNavigator CreateSafeNavigator(Uri source, WebRequestOptions options)
{
//------------------------------------------------------------
// Create safe navigator using auto-detection of encoding
//------------------------------------------------------------
return(SyndicationEncodingUtility.CreateSafeNavigator(source, options, null));
}
/// <summary>
/// Creates a <see cref="XPathNavigator"/> against the supplied <see cref="Uri"/> using the specified <see cref="ICredentials">credentials</see> and <see cref="IWebProxy">proxy</see>.
/// </summary>
/// <param name="source">A <see cref="Uri"/> that points to the location of the XML data to be navigated by the created <see cref="XPathNavigator"/>.</param>
/// <param name="credentials">
/// A <see cref="ICredentials"/> that provides the proper set of credentials to the <paramref name="source"/> resource when required.
/// If <paramref name="credentials"/> is <b>null</b>, request is made using the default application credentials.
/// </param>
/// <param name="proxy">
/// A <see cref="IWebProxy"/> that provides proxy access to the <paramref name="source"/> resource when required.
/// If <paramref name="proxy"/> is <b>null</b>, request is made using the <see cref="WebRequest"/> default proxy settings.
/// </param>
/// <returns>
/// An <see cref="XPathNavigator"/> that provides a cursor model for navigating the supplied <paramref name="source"/>.
/// The supplied <paramref name="source"/> XML data is parsed to remove invalid XML characters that would normally prevent
/// a navigator from being created.
/// </returns>
/// <exception cref="ArgumentNullException">The <paramref name="source"/> is a null reference (Nothing in Visual Basic).</exception>
public static XPathNavigator CreateSafeNavigator(Uri source, ICredentials credentials, IWebProxy proxy)
{
//------------------------------------------------------------
// Create safe navigator using auto-detection of encoding
//------------------------------------------------------------
return(SyndicationEncodingUtility.CreateSafeNavigator(source, new WebRequestOptions(credentials, proxy)));
}
/// <summary>
/// Creates a <see cref="XPathNavigator"/> against the supplied <see cref="TextReader"/>.
/// </summary>
/// <param name="reader">The <see cref="TextReader"/> object that contains the XML data to be navigated by the created <see cref="XPathNavigator"/>.</param>
/// <returns>
/// An <see cref="XPathNavigator"/> that provides a cursor model for navigating the supplied <paramref name="reader"/>.
/// The supplied <paramref name="reader"/> XML data is parsed to remove invalid XML characters that would normally prevent
/// a navigator from being created.
/// </returns>
/// <exception cref="ArgumentNullException">The <paramref name="reader"/> is a null reference (Nothing in Visual Basic).</exception>
public static XPathNavigator CreateSafeNavigator(TextReader reader)
{
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
Guard.ArgumentNotNull(reader, "reader");
//------------------------------------------------------------
// Attempt to return navigator for supplied reader
//------------------------------------------------------------
return(SyndicationEncodingUtility.CreateSafeNavigator(reader.ReadToEnd()));
}
//============================================================
// PUBLIC METHODS
//============================================================
#region CreateNavigator()
/// <summary>
/// Initializes a read-only <see cref="XPathNavigator"/> object for navigating through the auto-discoverable syndicated content located at the <see cref="Source">endpoint location</see>.
/// </summary>
/// <returns>A read-only <see cref="XPathNavigator"/> object for navigating the auto-discoverable syndicated content.</returns>
/// <exception cref="ArgumentNullException">The <see cref="Source"/> is a null reference (Nothing in Visual Basic).</exception>
public XPathNavigator CreateNavigator()
{
//------------------------------------------------------------
// Validate that endpoint has a valid source
//------------------------------------------------------------
Guard.ArgumentNotNull(this.Source, "Source");
//------------------------------------------------------------
// Return a safe navigator for endpoint
//------------------------------------------------------------
return(SyndicationEncodingUtility.CreateSafeNavigator(this.Source, new WebRequestOptions()));
}
/// <summary>
/// Returns an <see cref="Encoding"/> that represents the XML character encoding for the supplied <see cref="Stream"/>.
/// </summary>
/// <param name="stream">A <see cref="Stream"/> that represents an XML data source to determine the character encoding for.</param>
/// <returns>
/// A <see cref="Encoding"/> that represents the character encoding specified by the XML data source.
/// If the character encoding is not specified or unable to be determined, returns <see cref="Encoding.UTF8"/>.
/// </returns>
/// <exception cref="ArgumentNullException">The <paramref name="stream"/> is a null reference (Nothing in Visual Basic).</exception>
public static Encoding GetXmlEncoding(Stream stream)
{
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
Guard.ArgumentNotNull(stream, "stream");
//------------------------------------------------------------
// Read the stream contents and return character encoding
//------------------------------------------------------------
using (StreamReader reader = new StreamReader(stream))
{
return(SyndicationEncodingUtility.GetXmlEncoding(reader.ReadToEnd()));
}
}
//puke
///// <summary>
///// Extracts the character encoding for the content type of the supplied <see cref="HttpRequest"/>.
///// </summary>
///// <param name="request">The HTTP values sent by a client during a Web request.</param>
///// <returns>
///// A <see cref="Encoding"/> that represents character encoding of the Content-Type <i>charset</i> attribute.
///// If the <i>charset</i> attribute is unavailable or invalid, returns <b>null</b>.
///// </returns>
///// <exception cref="ArgumentNullException">The <paramref name="request"/> is a null reference (Nothing in Visual Basic).</exception>
//public static Encoding GetCharacterEncoding(HttpRequest request)
//{
// //------------------------------------------------------------
// // Local members
// //------------------------------------------------------------
// Encoding contentEncoding = null;
// //------------------------------------------------------------
// // Validate parameter
// //------------------------------------------------------------
// Guard.ArgumentNotNull(request, "request");
// //------------------------------------------------------------
// // Extract character encoding from HTTP request
// //------------------------------------------------------------
// if (!String.IsNullOrEmpty(request.ContentType))
// {
// if (request.ContentType.Contains(";"))
// {
// string[] contentTypeParts = request.ContentType.Split(";".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
// if (contentTypeParts != null && contentTypeParts.Length > 0)
// {
// for (int i = 0; i < contentTypeParts.Length; i++)
// {
// string typePart = contentTypeParts[i].Trim();
// if (typePart.Contains("="))
// {
// string[] nameValuePair = typePart.Split("=".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
// if (nameValuePair != null && nameValuePair.Length == 2)
// {
// string name = nameValuePair[0].Trim();
// string value = nameValuePair[1].Trim();
// if (String.Compare(name, "charset", StringComparison.OrdinalIgnoreCase) == 0)
// {
// try
// {
// contentEncoding = Encoding.GetEncoding(value);
// }
// catch (ArgumentException)
// {
// return null;
// }
// }
// }
// }
// }
// }
// }
// }
// return contentEncoding;
//}
#endregion
#region GetXmlEncoding(byte[] data)
/// <summary>
/// Returns an <see cref="Encoding"/> that represents the XML character encoding for the supplied array of bytes.
/// </summary>
/// <param name="data">An array of bytes that represents an XML data source to determine the character encoding for.</param>
/// <returns>
/// A <see cref="Encoding"/> that represents the character encoding specified by the XML data source.
/// If the character encoding is not specified or unable to be determined, returns <see cref="Encoding.UTF8"/>.
/// </returns>
/// <exception cref="ArgumentNullException">The <paramref name="data"/> is a null reference (Nothing in Visual Basic).</exception>
public static Encoding GetXmlEncoding(byte[] data)
{
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
Guard.ArgumentNotNull(data, "data");
//------------------------------------------------------------
// Create stream using data and return character encoding
//------------------------------------------------------------
using (MemoryStream stream = new MemoryStream(data))
{
return(SyndicationEncodingUtility.GetXmlEncoding(stream));
}
}
/// <summary>
/// Creates a <see cref="XPathNavigator"/> against the supplied <see cref="Stream"/> using the specified <see cref="Encoding"/>.
/// </summary>
/// <param name="stream">The <see cref="Stream"/> object that contains the XML data to be navigated by the created <see cref="XPathNavigator"/>.</param>
/// <param name="encoding">A <see cref="Encoding"/> object that indicates the character encoding to use when reading the supplied <paramref name="stream"/>.</param>
/// <returns>
/// An <see cref="XPathNavigator"/> that provides a cursor model for navigating the supplied <paramref name="stream"/>.
/// The supplied <paramref name="stream"/> XML data is parsed to remove invalid XML characters that would normally prevent
/// a navigator from being created.
/// </returns>
/// <exception cref="ArgumentNullException">The <paramref name="stream"/> is a null reference (Nothing in Visual Basic).</exception>
/// <exception cref="ArgumentNullException">The <paramref name="encoding"/> is a null reference (Nothing in Visual Basic).</exception>
public static XPathNavigator CreateSafeNavigator(Stream stream, Encoding encoding)
{
//------------------------------------------------------------
// Validate parameter
//------------------------------------------------------------
Guard.ArgumentNotNull(stream, "stream");
Guard.ArgumentNotNull(encoding, "encoding");
//------------------------------------------------------------
// Attempt to return navigator for supplied stream and encoding
//------------------------------------------------------------
using (StreamReader reader = new StreamReader(stream, encoding))
{
return(SyndicationEncodingUtility.CreateSafeNavigator(reader.ReadToEnd()));
}
}
/// <summary>
/// Creates a <see cref="XPathNavigator"/> against the supplied <see cref="Uri"/> using the specified <see cref="ICredentials">credentials</see> and <see cref="IWebProxy">proxy</see>.
/// </summary>
/// <param name="source">A <see cref="Uri"/> that points to the location of the XML data to be navigated by the created <see cref="XPathNavigator"/>.</param>
/// <param name="options">A <see cref="WebRequestOptions"/> that holds options that should be applied to web requests.</param>
/// <param name="encoding">A <see cref="Encoding"/> object that indicates the expected character encoding of the supplied <paramref name="source"/>. This value can be <b>null</b>.</param>
/// <returns>
/// An <see cref="XPathNavigator"/> that provides a cursor model for navigating the supplied <paramref name="source"/>.
/// The supplied <paramref name="source"/> XML data is parsed to remove invalid XML characters that would normally prevent
/// a navigator from being created.
/// </returns>
/// <remarks>
/// If the <paramref name="encoding"/> is <b>null</b>, the character encoding of the supplied <paramref name="source"/> is determined automatically.
/// Otherwise the specified <paramref name="encoding"/> is used when reading the XML data represented by the supplied <paramref name="source"/>.
/// </remarks>
/// <exception cref="ArgumentNullException">The <paramref name="source"/> is a null reference (Nothing in Visual Basic).</exception>
public static XPathNavigator CreateSafeNavigator(Uri source, WebRequestOptions options, Encoding encoding)
{
//------------------------------------------------------------
// Validate parameters
//------------------------------------------------------------
Guard.ArgumentNotNull(source, "source");
using (WebResponse response = SyndicationEncodingUtility.CreateWebResponse(source, options))
{
Stream stream = null;
HttpWebResponse httpResponse = response as HttpWebResponse;
if (httpResponse != null)
{
string contentEncoding = httpResponse.ContentEncoding.ToUpperInvariant();
if (contentEncoding.Contains("GZIP"))
{
stream = new GZipStream(httpResponse.GetResponseStream(), CompressionMode.Decompress);
}
else if (contentEncoding.Contains("DEFLATE"))
{
stream = new DeflateStream(httpResponse.GetResponseStream(), CompressionMode.Decompress);
}
else
{
stream = httpResponse.GetResponseStream();
}
}
else
{
stream = response.GetResponseStream();
}
if (encoding != null)
{
return(SyndicationEncodingUtility.CreateSafeNavigator(stream, encoding));
}
else
{
return(SyndicationEncodingUtility.CreateSafeNavigator(stream));
}
}
}
/// <summary>
/// Returns the <see cref="WebResponse"/> to a request for a resource located at the supplied <see cref="Uri"/> using the specified <see cref="ICredentials">credentials</see> and <see cref="IWebProxy">proxy</see>.
/// </summary>
/// <param name="source">A <see cref="Uri"/> that points to the location of the resource to be retrieved.</param>
/// <param name="options">A <see cref="WebRequestOptions"/> that holds options that should be applied to web requests.</param>
/// <returns>
/// An <see cref="WebResponse"/> that contains the response from the requested resource. If unable to create a <see cref="WebResponse"/> for
/// the requested <paramref name="source"/>, returns a <b>null</b> reference (Nothing in Visual Basic).
/// </returns>
/// <exception cref="ArgumentNullException">The <paramref name="source"/> is a null reference (Nothing in Visual Basic).</exception>
public static WebResponse CreateWebResponse(Uri source, WebRequestOptions options)
{
//------------------------------------------------------------
// Validate parameters
//------------------------------------------------------------
WebResponse response = null;
//------------------------------------------------------------
// Validate parameters
//------------------------------------------------------------
Guard.ArgumentNotNull(source, "source");
WebRequest webRequest = SyndicationEncodingUtility.CreateWebRequest(source, options);
if (webRequest != null)
{
response = webRequest.GetResponse();
}
return(response);
}
/// <summary>
/// Returns the <see cref="WebResponse"/> to a request for a resource located at the supplied <see cref="Uri"/> using the specified <see cref="ICredentials">credentials</see> and <see cref="IWebProxy">proxy</see>.
/// </summary>
/// <param name="source">A <see cref="Uri"/> that points to the location of the resource to be retrieved.</param>
/// <param name="credentials">
/// A <see cref="ICredentials"/> that provides the proper set of credentials to the <paramref name="source"/> resource when required.
/// If <paramref name="credentials"/> is <b>null</b>, request is made using the default application credentials if supported by the underlying protocol.
/// </param>
/// <param name="proxy">
/// A <see cref="IWebProxy"/> that provides proxy access to the <paramref name="source"/> resource when required.
/// If <paramref name="proxy"/> is <b>null</b>, request is made using the <see cref="WebRequest"/> default proxy settings if supported by the underlying protocol.
/// </param>
/// <returns>
/// An <see cref="WebResponse"/> that contains the response from the requested resource. If unable to create a <see cref="WebResponse"/> for
/// the requested <paramref name="source"/>, returns a <b>null</b> reference (Nothing in Visual Basic).
/// </returns>
/// <exception cref="ArgumentNullException">The <paramref name="source"/> is a null reference (Nothing in Visual Basic).</exception>
public static WebResponse CreateWebResponse(Uri source, ICredentials credentials, IWebProxy proxy)
{
return(SyndicationEncodingUtility.CreateWebResponse(source, new WebRequestOptions(credentials, proxy)));
}