/// <summary>
/// Determines the key used to sign a feed or catalog file. Only uses the first signature if more than one is present.
/// </summary>
/// <param name="path">The feed or catalog file to check for signatures.</param>
/// <param name="openPgp">The OpenPGP-compatible system used to validate the signatures.</param>
/// <returns>The key used to sign the file; <c>null</c> if the file was not signed.</returns>
/// <exception cref="FileNotFoundException">The file file could not be found.</exception>
/// <exception cref="IOException">The file could not be read.</exception>
/// <exception cref="UnauthorizedAccessException">Read access to the file is not permitted.</exception>
public static OpenPgpSecretKey?GetKey(string path, IOpenPgp openPgp)
{
#region Sanity checks
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException(nameof(path));
}
if (openPgp == null)
{
throw new ArgumentNullException(nameof(openPgp));
}
#endregion
try
{
var signature = StoreFeedUtils.GetSignatures(openPgp, File.ReadAllBytes(path))
.OfType <ValidSignature>()
.FirstOrDefault();
if (signature == null)
{
return(null);
}
return(openPgp.GetSecretKey(signature));
}
#region Error handling
catch (KeyNotFoundException)
{
Log.Info(Resources.SecretKeyNotInKeyring);
return(null);
}
catch (SignatureException ex)
{
// Unable to parse the signature
Log.Error(ex);
return(null);
}
#endregion
}
public void TestGetSignaturesDataAfterSignature()
{
string input = FeedText + FeedUtils.SignatureBlockStart + _signatureBase64 + FeedUtils.SignatureBlockEnd + "more data";
Assert.Throws <SignatureException>(() => FeedUtils.GetSignatures(new Mock <IOpenPgp>().Object, Encoding.UTF8.GetBytes(input)));
}
public void TestGetSignaturesInvalidChars()
{
const string input = FeedText + FeedUtils.SignatureBlockStart + "*!?#" + FeedUtils.SignatureBlockEnd;
Assert.Throws <SignatureException>(() => FeedUtils.GetSignatures(new Mock <IOpenPgp>().Object, Encoding.UTF8.GetBytes(input)));
}
public void TestGetSignaturesMissingNewLine()
{
string input = "Feed without newline" + FeedUtils.SignatureBlockStart + _signatureBase64 + FeedUtils.SignatureBlockEnd;
Assert.Throws <SignatureException>(() => FeedUtils.GetSignatures(new Mock <IOpenPgp>().Object, Encoding.UTF8.GetBytes(input)));
}
public void TestGetSignaturesMissingEnd()
{
string input = FeedText + FeedUtils.SignatureBlockStart + _signatureBase64;
Assert.Throws <SignatureException>(() => FeedUtils.GetSignatures(MockRepository.Create <IOpenPgp>().Object, Encoding.UTF8.GetBytes(input)));
}
