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CalAnonSync
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Simplified authentication negotiation

This commit is contained in:
Andreas Schneider 2018-04-03 12:12:50 +02:00
parent a739a9b4bb
commit 7ca7675a85
1 changed files with 20 additions and 22 deletions
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42
src/calanonsync/ews.go
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@ -66,28 +66,24 @@ type EWSRoundTripper struct {
}
func (er EWSRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
if er.authType == authTypeBasic {
r.SetBasicAuth(er.username, er.password)
}
er.initMutex.Lock()
resp, err := er.delegate.RoundTrip(r)
if err == nil && resp.StatusCode == http.StatusUnauthorized && er.authType == authTypeUnknown {
// This is a good time to find out what the server prefers.
authHeaders := resp.Header["Www-Authenticate"]
if authHeaders != nil {
for _, h := range authHeaders {
if strings.HasPrefix(h, "BASIC") {
er.authType = authTypeBasic
} else if strings.HasPrefix(h, "NTLM") {
er.authType = authTypeNTLM
break // NTLM is the best we could do
if er.authType == authTypeUnknown {
// Find authentication scheme.
resp, err := http.DefaultClient.Get(r.URL.String())
if err == nil && resp.StatusCode == http.StatusUnauthorized {
// This is a good time to find out what the server prefers.
authHeaders := resp.Header["Www-Authenticate"]
if authHeaders != nil {
for _, h := range authHeaders {
if strings.HasPrefix(h, "BASIC") {
er.authType = authTypeBasic
} else if strings.HasPrefix(h, "NTLM") {
er.authType = authTypeNTLM
break // NTLM is the best we could do
}
}
}
}
// So, do we know more than before? If so, try again.
if er.authType > authTypeUnknown {
if er.authType == authTypeNTLM {
// We need to replace the delegator.
er.delegate = &httpntlm.NtlmTransport{
@ -96,13 +92,15 @@ func (er EWSRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
Password: er.password,
}
}
er.initMutex.Unlock()
return er.RoundTrip(r)
}
}
er.initMutex.Unlock()
return resp, err
if er.authType == authTypeBasic {
r.SetBasicAuth(er.username, er.password)
}
return er.delegate.RoundTrip(r)
}
func NewEWSCalendar(url, username, password string) *EWSCalendar {