public StreamFactoryResult OpenStreamIfModified(Uri uri, LastModifyResult lastModifyResult, bool passiveMode)
{
if (uri == null)
{
_log.Error("OpenStreamIfModified method uri member is null");
throw new ArgumentNullException("uri");
}
try
{
return(OpenStreamIfModified(WebRequest.Create(uri), lastModifyResult, passiveMode));
}
catch (UriFormatException ex)
{
_log.ErrorFormat("Specified path has invalid format: {0}", ex.Message);
throw new ApplicationException(string.Format("Specified path has invalid format: {0}", ex.Message), ex);
}
catch (NotSupportedException ex)
{
_log.ErrorFormat(string.Format("Specified path has invalid format: {0}", ex.Message), ex);
throw new ApplicationException(
string.Format("The request scheme specified in requestUri is not registered: {0}", ex.Message), ex);
}
catch (SecurityException ex)
{
_log.ErrorFormat("The caller does not have permission to connect to the requested URI or a URI that the request is redirected to: {0}", ex.Message);
throw new ApplicationException(
string.Format(
"The caller does not have permission to connect to the requested URI or a URI that the request is redirected to: {0}",
ex.Message), ex);
}
}
public StreamFactoryResult OpenStreamIfModified(Uri uri, LastModifyResult lastModifyResult, bool passiveMode)
{
if (uri == null)
{
_log.Error("OpenStreamIfModified method uri member is null");
throw new ArgumentNullException("uri");
}
try
{
return OpenStreamIfModified(WebRequest.Create(uri), lastModifyResult, passiveMode);
}
catch (UriFormatException ex)
{
_log.ErrorFormat("Specified path has invalid format: {0}", ex.Message);
throw new ApplicationException(string.Format("Specified path has invalid format: {0}", ex.Message), ex);
}
catch (NotSupportedException ex)
{
_log.ErrorFormat(string.Format("Specified path has invalid format: {0}", ex.Message), ex);
throw new ApplicationException(
string.Format("The request scheme specified in requestUri is not registered: {0}", ex.Message), ex);
}
catch (SecurityException ex)
{
_log.ErrorFormat("The caller does not have permission to connect to the requested URI or a URI that the request is redirected to: {0}", ex.Message);
throw new ApplicationException(
string.Format(
"The caller does not have permission to connect to the requested URI or a URI that the request is redirected to: {0}",
ex.Message), ex);
}
}
private static StreamFactoryResult OpenStreamIfModified(FileWebRequest request, LastModifyResult lastModifyResult)
{
var path = request.RequestUri.LocalPath;
var fileInfo = new FileInfo(path);
if (!fileInfo.Exists)
{
throw new ApplicationException(string.Format("File \"{0}\" does not exist", path));
}
return HasChanged(new DateTime(lastModifyResult.ModifyTimeUtcsTicks), fileInfo.LastWriteTimeUtc)
? new StreamFactoryResult
{
Stream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read),
LastModifyResult = new LastModifyResult { ModifyTimeUtcsTicks = fileInfo.LastWriteTimeUtc.ToUniversalTime().Ticks }
}
: null;
}
private static StreamFactoryResult OpenStreamIfModified(WebRequest request, LastModifyResult lastModifyResult,
bool passiveMode)
{
if (request is FileWebRequest)
{
return OpenStreamIfModified((FileWebRequest)request, lastModifyResult);
}
if (request is HttpWebRequest)
{
return OpenStreamIfModified((HttpWebRequest)request, lastModifyResult);
}
if (request is FtpWebRequest)
{
var ftpWebRequest = (FtpWebRequest)request;
ftpWebRequest.UsePassive = passiveMode;
return OpenStreamIfModified(ftpWebRequest, lastModifyResult);
}
throw new ApplicationException(string.Format("Unsupported resource \"{0}\"", request.RequestUri));
}
private static StreamFactoryResult OpenStreamIfModified(WebRequest request, LastModifyResult lastModifyResult,
bool passiveMode)
{
if (request is FileWebRequest)
{
return(OpenStreamIfModified((FileWebRequest)request, lastModifyResult));
}
if (request is HttpWebRequest)
{
return(OpenStreamIfModified((HttpWebRequest)request, lastModifyResult));
}
if (request is FtpWebRequest)
{
var ftpWebRequest = (FtpWebRequest)request;
ftpWebRequest.UsePassive = passiveMode;
return(OpenStreamIfModified(ftpWebRequest, lastModifyResult));
}
throw new ApplicationException(string.Format("Unsupported resource \"{0}\"", request.RequestUri));
}
private static StreamFactoryResult OpenStreamIfModified(HttpWebRequest request, LastModifyResult lastModifyResult)
{
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.BypassCache);
if (!string.IsNullOrEmpty(lastModifyResult.ETagHeader))
{
request.Headers[HttpRequestHeader.IfNoneMatch] = lastModifyResult.ETagHeader;
}
else if (lastModifyResult.ModifyTimeUtcsTicks != DateTime.MinValue.Ticks)
{
request.IfModifiedSince = new DateTime(lastModifyResult.ModifyTimeUtcsTicks);
}
try
{
using (var response = (HttpWebResponse)request.GetResponse())
{
if (response.StatusCode == HttpStatusCode.NotModified) return null;
{
var stream = new MemoryStream();
CopyTo(response.GetResponseStream(), stream);
stream.Seek(0, SeekOrigin.Begin);
return new StreamFactoryResult
{
Stream = stream,
LastModifyResult = new LastModifyResult
{
ModifyTimeUtcsTicks = response.Headers[HttpResponseHeader.LastModified] == null ? DateTime.MinValue.Ticks : response.LastModified.ToUniversalTime().Ticks,
ETagHeader = response.Headers[HttpResponseHeader.ETag] ?? string.Empty
}
};
}
}
}
catch (WebException wex)
{
var httpResponse = wex.Response as HttpWebResponse;
if (httpResponse != null && httpResponse.StatusCode == HttpStatusCode.NotModified)
{
// resource was not modified.
return null;
}
// Something else happened. Rethrow or log.
throw;
}
}
private static StreamFactoryResult OpenStreamIfModified(FtpWebRequest request, LastModifyResult lastModifyResult)
{
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.BypassCache);
request.Method = WebRequestMethods.Ftp.GetDateTimestamp;
using (var dateTimestampResponse = (FtpWebResponse)request.GetResponse())
{
if (!HasChanged(new DateTime(lastModifyResult.ModifyTimeUtcsTicks), dateTimestampResponse.LastModified)) return null;
var ftpWebRequest = (FtpWebRequest)WebRequest.Create(request.RequestUri);
ftpWebRequest.UsePassive = request.UsePassive;
ftpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile;
using (var downloadFileResponse = (FtpWebResponse)ftpWebRequest.GetResponse())
{
var stream = new MemoryStream();
using (var responseStream = downloadFileResponse.GetResponseStream())
{
CopyTo(responseStream, stream);
}
stream.Seek(0, SeekOrigin.Begin);
return new StreamFactoryResult
{
Stream = stream,
LastModifyResult = new LastModifyResult { ModifyTimeUtcsTicks = dateTimestampResponse.LastModified.ToUniversalTime().Ticks }
};
}
}
}
private static StreamFactoryResult OpenStreamIfModified(FileWebRequest request, LastModifyResult lastModifyResult)
{
var path = request.RequestUri.LocalPath;
var fileInfo = new FileInfo(path);
if (!fileInfo.Exists)
{
throw new ApplicationException(string.Format("File \"{0}\" does not exist", path));
}
return(HasChanged(new DateTime(lastModifyResult.ModifyTimeUtcsTicks), fileInfo.LastWriteTimeUtc)
? new StreamFactoryResult
{
Stream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read),
LastModifyResult = new LastModifyResult {
ModifyTimeUtcsTicks = fileInfo.LastWriteTimeUtc.ToUniversalTime().Ticks
}
}
: null);
}
private static StreamFactoryResult OpenStreamIfModified(FtpWebRequest request, LastModifyResult lastModifyResult)
{
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.BypassCache);
request.Method = WebRequestMethods.Ftp.GetDateTimestamp;
using (var dateTimestampResponse = (FtpWebResponse)request.GetResponse())
{
if (!HasChanged(new DateTime(lastModifyResult.ModifyTimeUtcsTicks), dateTimestampResponse.LastModified))
{
return(null);
}
var ftpWebRequest = (FtpWebRequest)WebRequest.Create(request.RequestUri);
ftpWebRequest.UsePassive = request.UsePassive;
ftpWebRequest.Method = WebRequestMethods.Ftp.DownloadFile;
using (var downloadFileResponse = (FtpWebResponse)ftpWebRequest.GetResponse())
{
var stream = new MemoryStream();
using (var responseStream = downloadFileResponse.GetResponseStream())
{
CopyTo(responseStream, stream);
}
stream.Seek(0, SeekOrigin.Begin);
return(new StreamFactoryResult
{
Stream = stream,
LastModifyResult = new LastModifyResult {
ModifyTimeUtcsTicks = dateTimestampResponse.LastModified.ToUniversalTime().Ticks
}
});
}
}
}
private static StreamFactoryResult OpenStreamIfModified(HttpWebRequest request, LastModifyResult lastModifyResult)
{
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.BypassCache);
if (!string.IsNullOrEmpty(lastModifyResult.ETagHeader))
{
request.Headers[HttpRequestHeader.IfNoneMatch] = lastModifyResult.ETagHeader;
}
else if (lastModifyResult.ModifyTimeUtcsTicks != DateTime.MinValue.Ticks)
{
request.IfModifiedSince = new DateTime(lastModifyResult.ModifyTimeUtcsTicks);
}
try
{
using (var response = (HttpWebResponse)request.GetResponse())
{
if (response.StatusCode == HttpStatusCode.NotModified)
{
return(null);
}
{
var stream = new MemoryStream();
CopyTo(response.GetResponseStream(), stream);
stream.Seek(0, SeekOrigin.Begin);
return(new StreamFactoryResult
{
Stream = stream,
LastModifyResult = new LastModifyResult
{
ModifyTimeUtcsTicks = response.Headers[HttpResponseHeader.LastModified] == null ? DateTime.MinValue.Ticks : response.LastModified.ToUniversalTime().Ticks,
ETagHeader = response.Headers[HttpResponseHeader.ETag] ?? string.Empty
}
});
}
}
}
catch (WebException wex)
{
var httpResponse = wex.Response as HttpWebResponse;
if (httpResponse != null && httpResponse.StatusCode == HttpStatusCode.NotModified)
{
// resource was not modified.
return(null);
}
// Something else happened. Rethrow or log.
throw;
}
}