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Prevented crash on empty string to our funcs +... 

* changed encodeBytes to encode and decodeBytes to decode
* fixed few comments
This commit is contained in:
Alex Sergeyev 2014-09-15 09:02:51 -04:00
parent c38aeeb355
commit c37add8d9e
2 changed files with 34 additions and 22 deletions
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43
idn/punycode.go
View File

@ -31,31 +31,34 @@ const (
// unicode strings.
func ToPunycode(s string) string {
tokens := dns.SplitDomainName(s)
if s[len(s)-1] == '.' {
if tokens == nil {
tokens = []string{"", ""}
} else {
tokens = append(tokens, "")
}
switch {
case s == "":
return ""
case tokens == nil: // s == .
return "."
case s[len(s)-1] == '.':
tokens = append(tokens, "")
}
for i := range tokens {
tokens[i] = string(encodeBytes([]byte(tokens[i])))
tokens[i] = string(encode([]byte(tokens[i])))
}
return strings.Join(tokens, ".")
}
// FromPunycode returns uncode domain name from provided punycode string.
// FromPunycode returns unicode domain name from provided punycode string.
func FromPunycode(s string) string {
tokens := dns.SplitDomainName(s)
if s[len(s)-1] == '.' {
if tokens == nil {
tokens = []string{"", ""}
} else {
tokens = append(tokens, "")
}
switch {
case s == "":
return ""
case tokens == nil: // s == .
return "."
case s[len(s)-1] == '.':
tokens = append(tokens, "")
}
for i := range tokens {
tokens[i] = string(decodeBytes([]byte(tokens[i])))
tokens[i] = string(decode([]byte(tokens[i])))
}
return strings.Join(tokens, ".")
}
@ -117,7 +120,7 @@ func next(b []rune, boundary rune) rune {
}
// preprune converts unicode rune to lower case. At this time it's not
// supporting all things described RFC3454.
// supporting all things described in RFCs
func preprune(r rune) rune {
if unicode.IsUpper(r) {
r = unicode.ToLower(r)
@ -136,8 +139,8 @@ func tfunc(k, bias rune) rune {
return k - bias
}
// encodeBytes transforms Unicode input bytes (that represent DNS label) into punycode bytestream
func encodeBytes(input []byte) []byte {
// encode transforms Unicode input bytes (that represent DNS label) into punycode bytestream
func encode(input []byte) []byte {
n, bias := _N, _BIAS
b := bytes.Runes(input)
@ -204,8 +207,8 @@ func encodeBytes(input []byte) []byte {
return out.Bytes()
}
// decodeBytes transforms punycode input bytes (that represent DNS label) into Unicode bytestream
func decodeBytes(b []byte) []byte {
// decode transforms punycode input bytes (that represent DNS label) into Unicode bytestream
func decode(b []byte) []byte {
src := b // b would move and we need to keep it
n, bias := _N, _BIAS

13
idn/punycode_test.go
View File

@ -28,11 +28,11 @@ var testcases = [][2]string{
func TestEncodeDecodePunycode(t *testing.T) {
for _, tst := range testcases {
enc := encodeBytes([]byte(tst[0]))
enc := encode([]byte(tst[0]))
if string(enc) != tst[1] {
t.Errorf("%s encodeded as %s but should be %s", tst[0], enc, tst[1])
}
dec := decodeBytes([]byte(tst[1]))
dec := decode([]byte(tst[1]))
if string(dec) != strings.ToLower(tst[0]) {
t.Errorf("%s decoded as %s but should be %s", tst[1], dec, strings.ToLower(tst[0]))
}
@ -66,6 +66,15 @@ func TestEncodeDecodeFinalPeriod(t *testing.T) {
if decoded != strings.ToLower(tst[0]+".") {
t.Errorf("invalid result from string conversion to punycode when period added, %#v and should be %#v", decoded, tst[0]+".")
}
full = ToPunycode(tst[0])
if full != tst[1] {
t.Errorf("invalid result from string conversion to punycode when no period added at the end, %#v and should be %#v", full, tst[1]+".")
}
// assert punycode.com. == unicode.com.
decoded = FromPunycode(tst[1])
if decoded != strings.ToLower(tst[0]) {
t.Errorf("invalid result from string conversion to punycode when no period added, %#v and should be %#v", decoded, tst[0]+".")
}
}
}