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package alpscaldav
import (
"fmt"
"net/http"
"net/url"
"git.sr.ht/~emersion/alps"
)
const (
inputDateLayout = "2006-01-02"
inputTimeLayout = "15:04"
)
func sanityCheckURL(u *url.URL) error {
req, err := http.NewRequest(http.MethodOptions, u.String(), nil)
if err != nil {
return err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
resp.Body.Close()
// Servers might require authentication to perform an OPTIONS request
if resp.StatusCode/100 != 2 && resp.StatusCode != http.StatusUnauthorized {
return fmt.Errorf("HTTP request failed: %v %v", resp.StatusCode, resp.Status)
}
return nil
}
func newPlugin(srv *alps.Server) (alps.Plugin, error) {
u, err := srv.Upstream("caldavs", "caldav+insecure", "https", "http+insecure")
if _, ok := err.(*alps.NoUpstreamError); ok {
return nil, nil
} else if err != nil {
return nil, fmt.Errorf("caldav: failed to parse upstream caldav server: %v", err)
}
switch u.Scheme {
case "caldavs":
u.Scheme = "https"
case "caldav+insecure", "http+insecure":
u.Scheme = "http"
}
if u.Scheme == "" {
// TODO
err := fmt.Errorf("discovery not yet implemented")
srv.Logger().Printf("caldav: failed to discover CalDAV server: %v", err)
return nil, nil
}
if err := sanityCheckURL(u); err != nil {
return nil, fmt.Errorf("caldav: failed to connect to CalDAV server %q: %v", u, err)
}
srv.Logger().Printf("Configured upstream CalDAV server: %v", u)
p := alps.GoPlugin{Name: "caldav"}
registerRoutes(&p, u)
return p.Plugin(), nil
}
func init() {
alps.RegisterPluginLoader(func(s *alps.Server) ([]alps.Plugin, error) {
p, err := newPlugin(s)
if err != nil {
return nil, err
}
if p == nil {
return nil, nil
}
return []alps.Plugin{p}, err
})
}
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