public static Uri BuildNntpRequestUri(INntpServerDefinition sd, string nntpGroup)
{
// We do not use NntpWebRequest.NewsUriScheme here ("news"),
// because the UriBuilder build the Uri without slashes...
string schema = NntpWebRequest.NntpUriScheme;
if (sd.UseSSL)
{
schema = NntpWebRequest.NntpsUriScheme;
}
int port = NntpWebRequest.NntpDefaultServerPort;
if (sd.Port > 0 && sd.Port != NntpWebRequest.NntpDefaultServerPort)
{
port = sd.Port;
}
UriBuilder uriBuilder;
if (string.IsNullOrEmpty(nntpGroup))
{
uriBuilder = new UriBuilder(schema, sd.Server, port);
}
else
{
uriBuilder = new UriBuilder(schema, sd.Server, port, nntpGroup);
}
return(uriBuilder.Uri);
}
/// <summary>
/// Really loads the group list from the server.
/// </summary>
/// <param name="owner">Windows handle</param>
/// <param name="sd">NntpServerDefinition</param>
/// <returns>List of groups a server offer</returns>
/// <exception cref="ArgumentNullException">If <see paramref="sd">param sd</see> is null</exception>
/// <exception cref="Exception">On any failure we get on request</exception>
IList <string> FetchNewsGroupsFromServer(IWin32Window owner, INntpServerDefinition sd)
{
if (sd == null)
{
throw new ArgumentNullException("sd");
}
FetchNewsgroupsThreadHandler threadHandler = new FetchNewsgroupsThreadHandler(app, sd);
DialogResult result = threadHandler.Start(owner, SR.NntpLoadingGroupsWaitMessage, true);
if (DialogResult.OK != result)
{
return(new List <string>(0)); // cancelled
}
if (!threadHandler.OperationSucceeds)
{
MessageBox.Show(String.Format(
SR.ExceptionNntpLoadingGroupsFailed, sd.Server, threadHandler.OperationException.Message),
SR.GUINntpLoadingGroupsFailedCaption, MessageBoxButtons.OK, MessageBoxIcon.Error);
return(new List <string>(0)); // failed
}
return(threadHandler.Newsgroups);
}
/// <summary>
/// Return ICredentials of a feed.
/// </summary>
/// <param name="sd">NntpServerDefinition</param>
/// <returns>null in the case the nntp server does not have credentials</returns>
public ICredentials GetFeedCredentials(INntpServerDefinition sd)
{
ICredentials c = null;
if (sd.AuthUser != null)
{
string u, p;
GetNntpServerCredentials(sd, out u, out p);
c = CreateCredentialsFrom(u, p);
}
return(c);
}
private void SaveNewsGroupsToCache(INntpServerDefinition sd, ICollection <string> list)
{
string fn = BuildCacheFileName(sd);
RemoveCachedGroups(fn);
if (list != null && list.Count > 0)
{
try {
using (StreamWriter w = new StreamWriter(FileHelper.OpenForWrite(fn))) {
foreach (string line in list)
{
w.WriteLine(line);
}
}
} catch (Exception ex) {
_log.Error("SaveNewsGroupsToCache() failed to save '" + fn + "'", ex);
}
}
}
private IList <string> LoadNewsGroupsFromCache(INntpServerDefinition sd)
{
List <string> result = new List <string>();
string fn = BuildCacheFileName(sd);
if (File.Exists(fn))
{
try {
using (StreamReader r = new StreamReader(FileHelper.OpenForRead(fn))) {
string line = r.ReadLine();
while (line != null)
{
result.Add(line);
line = r.ReadLine();
}
}
} catch (Exception ex) {
_log.Error("LoadNewsGroupsFromCache() failed to load '" + fn + "'", ex);
}
}
return(result);
}
/// <summary>
/// Load the list of groups from either the cache, or if not available or forced
/// from the nntp server.
/// </summary>
/// <param name="owner">Windows handle</param>
/// <param name="sd">NntpServerDefinition</param>
/// <param name="forceLoadFromServer">set to true, if a 'fresh' group list should be loaded from the server</param>
/// <returns>List of groups a server offer</returns>
public IList <string> LoadNntpNewsGroups(IWin32Window owner, INntpServerDefinition sd, bool forceLoadFromServer)
{
IList <string> list;
if (forceLoadFromServer)
{
list = FetchNewsGroupsFromServer(owner, sd);
if (list != null && list.Count > 0)
{
SaveNewsGroupsToCache(sd, list);
}
else
{
RemoveCachedGroups(sd);
}
}
else
{
list = LoadNewsGroupsFromCache(sd);
}
return(list);
}
public FetchNewsgroupsThreadHandler(RssBanditApplication app, INntpServerDefinition sd)
{
this.app = app;
this.serverDef = sd;
this.Newsgroups = new List <string>(0);
}
private void RemoveCachedGroups(INntpServerDefinition sd)
{
RemoveCachedGroups(BuildCacheFileName(sd));
}
private string BuildCacheFileName(INntpServerDefinition sd)
{
return(Path.Combine(cachePath, String.Format("{0}_{1}.xml", sd.Server, sd.Port != 0 ? sd.Port : NntpWebRequest.NntpDefaultServerPort)));
}
public static Uri BuildNntpRequestUri(INntpServerDefinition sd)
{
return(BuildNntpRequestUri(sd, null));
}
/// <summary>
/// Gets (filters) the current subscriptions for Nntp feeds of a specific nntp server.
/// </summary>
/// <param name="sd">NntpServerDefinition</param>
/// <returns>List of NewsFeed objects, that match</returns>
public IList <NewsFeed> CurrentSubscriptions(INntpServerDefinition sd)
{
//TODO: impl. CurrentSubscriptions()
return(new List <NewsFeed>());
}
