/// <summary>Retrieve key certificate from this authority.</summary>
/// <param name="forceDownload"></param>
/// <returns></returns>
internal KeyCertificate GetKeyCertificate(RetrievalOptions options)
{
string cachedCertificateFilePath = CacheManager.GetKeyCertificateFilePath(this);
string certificateText = null;
if ((0 == (RetrievalOptions.ForceDownload & options)) &&
(0 != (RetrievalOptions.UseCache & options)))
{
if (File.Exists(cachedCertificateFilePath))
{
certificateText = File.ReadAllText(cachedCertificateFilePath);
}
}
if (null == certificateText)
{
certificateText = Encoding.ASCII.GetString(
WellKnownUrlRetriever.Retrieve(
WellKnownUrlRetriever.Document.KeyCertificate, this, true));
if (0 == (RetrievalOptions.DoNotUseCache & options))
{
File.WriteAllText(cachedCertificateFilePath, certificateText);
}
}
// Should the key certificate not be found, we expect the above code to throw
// an exception. TODO : verify this expectation.
KeyCertificate result = new KeyCertificateParser().Parse(certificateText);
result.Verify(this);
return(result);
}
internal string get_router_consensus(string identityFingerprint, bool compressed = true)
{
Globals.LogInfo("consensus::get_router_consensus() [identity_fingerprint: {0}]",
identityFingerprint);
return(Encoding.ASCII.GetString(
Authority.DownloadFromRandomAuthority(
WellKnownUrlRetriever.GetMostRecentServerDescriptorPath(identityFingerprint, compressed),
compressed)));
}
/// <summary>Retrieve and parse a valid consensus, depending on flags value,
/// either grab it from cache and/or download it from a random authority.</summary>
/// <param name="options"></param>
internal static Consensus Fetch(RetrievalOptions options)
{
// TODO : Factorize RetrievalOptions behavior with Authority.GetKeyCertificate
string consensusContent = null;
if ((0 == (RetrievalOptions.ForceDownload & options)) &&
(0 != (RetrievalOptions.UseCache & options)) &&
File.Exists(CacheManager.CachedConsensusFilePath))
{
consensusContent = File.ReadAllText(CacheManager.CachedConsensusFilePath);
}
else if ((0 != (options & RetrievalOptions.ForceDownload)) ||
(0 != (options & RetrievalOptions.DoNotUseCache)))
{
consensusContent = Encoding.ASCII.GetString(
WellKnownUrlRetriever.Retrieve(
WellKnownUrlRetriever.Document.MostRecentV3Consensus));
if (0 == (RetrievalOptions.DoNotUseCache & options))
{
File.WriteAllText(CacheManager.CachedConsensusFilePath, consensusContent);
}
}
Consensus result = null;
if (null != consensusContent)
{
result = Parser.ParseAndValidate(consensusContent);
}
// if the consensus is invalid, we have to download it anyway
// TODO : Don't download if options do not allow to do so.
if ((null == result) || (result.ValidUntilUTC < DateTime.UtcNow))
{
consensusContent = Encoding.ASCII.GetString(
WellKnownUrlRetriever.Retrieve(
WellKnownUrlRetriever.Document.MostRecentV3Consensus));
if (0 == (options & RetrievalOptions.DoNotUseCache))
{
File.WriteAllText(CacheManager.CachedConsensusFilePath, consensusContent);
}
result = Parser.ParseAndValidate(consensusContent);
}
return(result);
}
