public void AddSettingsTests()
{
Settings setting = new Settings(MakeNode(rman.GetString("DeflateAndHigh")));
Assertion.AssertEquals(CompressionLevels.High, setting.CompressionLevel);
Assertion.AssertEquals(Algorithms.Deflate, setting.PreferredAlgorithm);
// test adding a null node
setting.AddSettings(null);
Assertion.AssertEquals(CompressionLevels.High, setting.CompressionLevel);
Assertion.AssertEquals(Algorithms.Deflate, setting.PreferredAlgorithm);
// test overriding algorithm
setting.AddSettings(MakeNode(rman.GetString("GZip")));
Assertion.AssertEquals(CompressionLevels.High, setting.CompressionLevel);
Assertion.AssertEquals(Algorithms.GZip, setting.PreferredAlgorithm);
// test overriding compression level
setting.AddSettings(MakeNode(rman.GetString("LevelLow")));
Assertion.AssertEquals(CompressionLevels.Low, setting.CompressionLevel);
Assertion.AssertEquals(Algorithms.GZip, setting.PreferredAlgorithm);
}
/// <summary>
/// Get ahold of a <see cref="CompressingFilter"/> for the given encoding scheme.
/// If no encoding scheme can be found, it returns null.
/// </summary>
/// <remarks>
/// See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.3 for details
/// on how clients are supposed to construct the Accept-Encoding header. This
/// implementation follows those rules, though we allow the server to override
/// the preference given to different supported algorithms. I'm doing this as
/// I would rather give the server control over the algorithm decision than
/// the client. If the clients send up * as an accepted encoding with highest
/// quality, we use the preferred algorithm as specified in the config file.
/// </remarks>
public static CompressingFilter GetFilterForScheme(string[] schemes, Stream output, Settings prefs)
{
bool foundDeflate = false;
bool foundGZip = false;
bool foundStar = false;
float deflateQuality = 0f;
float gZipQuality = 0f;
float starQuality = 0f;
bool isAcceptableDeflate;
bool isAcceptableGZip;
bool isAcceptableStar;
for (int i = 0; i<schemes.Length;i++) {
string acceptEncodingValue = schemes[i].Trim().ToLower();
if (acceptEncodingValue.StartsWith("deflate")) {
foundDeflate = true;
float newDeflateQuality = GetQuality(acceptEncodingValue);
if (deflateQuality < newDeflateQuality)
deflateQuality = newDeflateQuality;
}
else if (acceptEncodingValue.StartsWith("gzip") || acceptEncodingValue.StartsWith("x-gzip")) {
foundGZip = true;
float newGZipQuality = GetQuality(acceptEncodingValue);
if (gZipQuality < newGZipQuality)
gZipQuality = newGZipQuality;
}
else if (acceptEncodingValue.StartsWith("*")) {
foundStar = true;
float newStarQuality = GetQuality(acceptEncodingValue);
if (starQuality < newStarQuality)
starQuality = newStarQuality;
}
}
isAcceptableStar = foundStar && (starQuality > 0);
isAcceptableDeflate = (foundDeflate && (deflateQuality > 0)) || (!foundDeflate && isAcceptableStar);
isAcceptableGZip = (foundGZip && (gZipQuality > 0)) || (!foundGZip && isAcceptableStar);
if (isAcceptableDeflate && !foundDeflate)
deflateQuality = starQuality;
if (isAcceptableGZip && !foundGZip)
gZipQuality = starQuality;
// do they support any of our compression methods?
if(!(isAcceptableDeflate || isAcceptableGZip || isAcceptableStar)) {
return null;
}
// if deflate is better according to client
if (isAcceptableDeflate && (!isAcceptableGZip || (deflateQuality > gZipQuality)))
return new DeflateFilter(output, prefs.CompressionLevel);
// if gzip is better according to client
if (isAcceptableGZip && (!isAcceptableDeflate || (deflateQuality < gZipQuality)))
return new GZipFilter(output);
// if we're here, the client either didn't have a preference or they don't support compression
if(isAcceptableDeflate && (prefs.PreferredAlgorithm == Algorithms.Deflate || prefs.PreferredAlgorithm == Algorithms.Default))
return new DeflateFilter(output, prefs.CompressionLevel);
if(isAcceptableGZip && prefs.PreferredAlgorithm == Algorithms.GZip)
return new GZipFilter(output);
if(isAcceptableDeflate || isAcceptableStar)
return new DeflateFilter(output, prefs.CompressionLevel);
if(isAcceptableGZip)
return new GZipFilter(output);
// return null. we couldn't find a filter.
return null;
}
public void ExcludeMultiplePaths()
{
Settings setting = new Settings(MakeNode(rman.GetString("ExcludeMultiplePaths")));
Assertion.Assert(setting.IsExcludedPath("foo.aspx"));
Assertion.Assert(setting.IsExcludedPath("foo/bar.aspx"));
}
public void EmptyNodeTest()
{
Settings setting = new Settings(MakeNode(rman.GetString("EmptyNode")));
Assertion.AssertEquals(CompressionLevels.Default, setting.CompressionLevel);
Assertion.AssertEquals(Algorithms.Default, setting.PreferredAlgorithm);
}
public void BadLevelTest()
{
Settings setting = new Settings(MakeNode(rman.GetString("BadLevel")));
Assertion.AssertEquals(CompressionLevels.Default, setting.CompressionLevel);
}
public void BadAlgorithmTest()
{
Settings setting = new Settings(MakeNode(rman.GetString("BadAlgorithm")));
Assertion.AssertEquals(Algorithms.Default, setting.PreferredAlgorithm);
}
public void UserRemovedExcludedType()
{
Settings setting = new Settings(MakeNode(rman.GetString("ExcludeMultipleTypes")));
Assertion.Assert(setting.IsExcludedMimeType("ben/foo"));
Assertion.Assert(setting.IsExcludedMimeType("image/jpeg"));
setting.AddSettings(MakeNode(rman.GetString("RemoveImageJpegExclusion")));
Assertion.Assert(setting.IsExcludedMimeType("ben/foo"));
Assertion.Assert(!setting.IsExcludedMimeType("image/jpeg"));
}
public void UserAddedMultipleExcludedTypes()
{
Settings setting = new Settings(MakeNode(rman.GetString("ExcludeMultipleTypes")));
Assertion.Assert(setting.IsExcludedMimeType("ben/foo"));
Assertion.Assert(setting.IsExcludedMimeType("image/jpeg"));
}
public void UserAddedExcludedType()
{
Settings setting = new Settings(MakeNode(rman.GetString("ExcludeBenFoo")));
Assertion.Assert(setting.IsExcludedMimeType("ben/foo"));
}
public void UserAddedAndRemovedType()
{
Settings setting = new Settings(MakeNode(rman.GetString("AddAndRemoveSameType")));
Assertion.Assert(!setting.IsExcludedMimeType("user/silly"));
}
public void RemoveExistingPathExclude()
{
Settings setting = new Settings(MakeNode(rman.GetString("ExcludeMultiplePaths")));
setting.AddSettings(MakeNode(rman.GetString("RemoveFooAspxExclude")));
Assertion.Assert(!setting.IsExcludedPath("foo.aspx"));
Assertion.Assert(setting.IsExcludedPath("foo/bar.aspx"));
}
