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package main
import (
"encoding/xml"
"fmt"
"net/http"
"strings"
)
// findPrincipal asks the endpoint who we are.
//
// go-webdav does this too, but it resolves the request path with
// path.Join, which drops a trailing slash: a client pointed at /dav/
// ends up asking about /dav, and Cyrus answers 405 for that exact
// spelling while answering 207 for /dav/. Deeper paths tolerate either,
// so only this first request needs doing by hand.
func findPrincipal(endpoint, user, pass string) (string, error) {
body := `<?xml version="1.0" encoding="utf-8"?>` +
`<d:propfind xmlns:d="DAV:"><d:prop><d:current-user-principal/></d:prop></d:propfind>`
req, err := http.NewRequest("PROPFIND", endpoint, strings.NewReader(body))
if err != nil {
return "", err
}
req.Header.Set("Depth", "0")
req.Header.Set("Content-Type", "application/xml; charset=utf-8")
req.SetBasicAuth(user, pass)
resp, err := client.Do(req)
if err != nil {
return "", err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusMultiStatus {
return "", fmt.Errorf("%s: %s", endpoint, resp.Status)
}
// Spelled out rather than using encoding/xml's "a>b" path
// shorthand, which does not carry namespaces through.
type href struct {
Href string `xml:"DAV: href"`
}
type prop struct {
Principal href `xml:"DAV: current-user-principal"`
}
type propstat struct {
Prop prop `xml:"DAV: prop"`
}
type response struct {
Propstats []propstat `xml:"DAV: propstat"`
}
var ms struct {
Responses []response `xml:"DAV: response"`
}
if err := xml.NewDecoder(resp.Body).Decode(&ms); err != nil {
return "", err
}
for _, r := range ms.Responses {
for _, ps := range r.Propstats {
if h := strings.TrimSpace(ps.Prop.Principal.Href); h != "" {
return h, nil
}
}
}
return "", fmt.Errorf("%s: no current-user-principal", endpoint)
}
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