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