func parseChallenge(challenge string) (parsed Challenges, err error) {
traceFn, traceT := trace.M(traceId, trace.Trace)
r := strings.NewReader(challenge)
rec := lexrec.NewRecord(256, nil, func(l *lexrec.Lexer) {})
var l *lexrec.Lexer
l, err = lexrec.NewLexerRun("ParseChallenge", r, rec, emitWWWAuthenticate)
if err != nil {
return nil, err
}
for {
item := l.NextItem()
if item.Type == lexrec.ItemEOF {
break
} else if item.Type == lexrec.ItemError {
err = fmt.Errorf("error at position %d: %s", item.Pos, item.Value)
break
}
switch item.Type {
case ItemDigest:
parsed = append(parsed, &Challenge{Scheme: item.Value})
case ItemBasic:
parsed = append(parsed, &Challenge{Scheme: item.Value})
case ItemRealm:
if i := len(parsed) - 1; i >= 0 {
parsed[i].Realm = item.Value[1 : len(item.Value)-1]
}
case ItemDomain:
if i := len(parsed) - 1; i >= 0 {
parsed[i].Domain = strings.Fields(item.Value[1 : len(item.Value)-1])
}
case ItemNonce:
if i := len(parsed) - 1; i >= 0 {
parsed[i].Nonce = item.Value[1 : len(item.Value)-1]
}
case ItemOpaque:
if i := len(parsed) - 1; i >= 0 {
parsed[i].Opaque = item.Value[1 : len(item.Value)-1]
}
case ItemStale:
if i := len(parsed) - 1; i >= 0 {
if item.Value == "true" {
parsed[i].Stale = true
} else {
parsed[i].Stale = false
}
}
case ItemAlgorithm:
if i := len(parsed) - 1; i >= 0 {
parsed[i].Algorithm = item.Value
}
case ItemQop:
if i := len(parsed) - 1; i >= 0 {
options := strings.Split(item.Value[1:len(item.Value)-1], ",")
parsed[i].Qop = options
}
case ItemAuthParam:
if traceT {
trace.T(traceFn, "skipping unrecognized auth-param: %s", item.Value)
}
default:
err = fmt.Errorf("unhandled item type %d at position %d: %v", item.Type, item.Pos, item.Value)
return
}
}
return
}