BUrl: IDNA ToUnicode and ToASCII conversions.

* Since DNS are normally restricted to ASCII, the use of UTF-8 in domain
names is implemented using a "punycode" encoding.
* The request to the DNS server must be sent with the ASCII
representation of the domain name, however the Unicode one should be
used for user-visible parts.
* ICU provides an implementation of the conversion, which we use here.
* Conversion is currently done in-place and modifies the BUrl object
(this is similar to UrlEncode/UrlDecode).
* Adjust existing IDN test to make use of these methods. It's passing
now.

headers/os/net/Url.h

@@ -64,6 +64,9 @@ public:
 			void				UrlEncode(bool strict = false);
 			void				UrlDecode(bool strict = false);
 
+			status_t			IDNAToAscii();
+			status_t			IDNAToUnicode();
+
 	// Url encoding/decoding of strings
 	static	BString				UrlEncode(const BString& url, 
 									bool strict = false, 

src/kits/network/libnetapi/Jamfile

@@ -1,6 +1,7 @@
 SubDir HAIKU_TOP src kits network libnetapi ;
 
 UsePrivateHeaders app net shared support ;
+UsePrivateHeaders locale shared ;
 
 UseHeaders [ FDirName $(HAIKU_TOP) src libs compat freebsd_network compat ]
 	: true ;
@@ -31,6 +32,11 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 			SetupFeatureObjectsDir no-ssl ;
 		}
 
+		# BUrl uses ICU to perform IDNA conversions (unicode domain names)
+		UseBuildFeatureHeaders icu ;
+		Includes [ FGristFiles Url.cpp ]
+			: [ BuildFeatureAttribute icu : headers ] ;
+
 		SharedLibrary [ MultiArchDefaultGristFiles libbnetapi.so ] :
 			init.cpp
 			DynamicBuffer.cpp
@@ -91,6 +97,7 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 			:
 			be $(TARGET_NETWORK_LIBS) [ TargetLibstdc++ ] [ TargetLibsupc++ ]
 			[ BuildFeatureAttribute openssl : libraries ]
+			[ BuildFeatureAttribute icu : libraries ]
 			[ MultiArchDefaultGristFiles libshared.a ]
 			;
 	}

src/kits/network/libnetapi/Url.cpp

@@ -17,8 +17,12 @@
 #include <MimeType.h>
 #include <Roster.h>
 
+#include <ICUWrapper.h>
 #include <RegExp.h>
 
+#include <unicode/idna.h>
+#include <unicode/stringpiece.h>
+
 
 static const char* kArchivedUrl = "be:url string";
 
@@ -594,6 +598,50 @@ BUrl::UrlDecode(bool strict)
 }
 
 
+status_t
+BUrl::IDNAToAscii()
+{
+	UErrorCode err = U_ZERO_ERROR;
+	icu::IDNA* converter = icu::IDNA::createUTS46Instance(0, err);
+	icu::IDNAInfo info;
+
+	BString result;
+	BStringByteSink sink(&result);
+	converter->nameToASCII_UTF8(icu::StringPiece(fHost.String()), sink, info,
+		err);
+
+	delete converter;
+
+	if (U_FAILURE(err))
+		return B_ERROR;
+
+	fHost = result;
+	return B_OK;
+}
+
+
+status_t
+BUrl::IDNAToUnicode()
+{
+	UErrorCode err = U_ZERO_ERROR;
+	icu::IDNA* converter = icu::IDNA::createUTS46Instance(0, err);
+	icu::IDNAInfo info;
+
+	BString result;
+	BStringByteSink sink(&result);
+	converter->nameToUnicodeUTF8(icu::StringPiece(fHost.String()), sink, info,
+		err);
+
+	delete converter;
+
+	if (U_FAILURE(err))
+		return B_ERROR;
+
+	fHost = result;
+	return B_OK;
+}
+
+
 // #pragma mark - utility functionality
 
 

src/tests/kits/net/service/UrlTest.cpp

@@ -587,10 +587,15 @@ UrlTest::IDNTest()
 	for (int i = 0; tests[i].escaped != NULL; i++)
 	{
 		NextSubTest();
+
 		BUrl url(tests[i].escaped);
 		url.UrlDecode();
-		CPPUNIT_ASSERT_EQUAL(BUrl(tests[i].decoded).UrlString(),
-			url.UrlString());
+
+		BUrl idn(tests[i].decoded);
+		status_t success = idn.IDNAToUnicode();
+
+		CPPUNIT_ASSERT_EQUAL(B_OK, success);
+		CPPUNIT_ASSERT_EQUAL(url.UrlString(), idn.UrlString());
 	}
 }