package koushincarddav import ( "fmt" "net/http" "net/url" "git.sr.ht/~emersion/koushin" koushinbase "git.sr.ht/~emersion/koushin/plugins/base" "github.com/emersion/go-vcard" "github.com/emersion/go-webdav/carddav" ) 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 } type plugin struct { koushin.GoPlugin url *url.URL homeSetCache map[string]string } func (p *plugin) clientWithAddressBook(session *koushin.Session) (*carddav.Client, *carddav.AddressBook, error) { c, err := newClient(p.url, session) if err != nil { return nil, nil, fmt.Errorf("failed to create CardDAV client: %v", err) } homeSet, ok := p.homeSetCache[session.Username()] if !ok { principal, err := c.FindCurrentUserPrincipal() if err != nil { return nil, nil, fmt.Errorf("failed to query CardDAV principal: %v", err) } homeSet, err = c.FindAddressBookHomeSet(principal) if err != nil { return nil, nil, fmt.Errorf("failed to query CardDAV address book home set: %v", err) } p.homeSetCache[session.Username()] = homeSet // TODO: evict entries from the cache if it's getting too big } addressBooks, err := c.FindAddressBooks(homeSet) if err != nil { return nil, nil, fmt.Errorf("failed to query CardDAV address books: %v", err) } if len(addressBooks) == 0 { return nil, nil, errNoAddressBook } return c, &addressBooks[0], nil } func newPlugin(srv *koushin.Server) (koushin.Plugin, error) { u, err := srv.Upstream("carddavs", "carddav+insecure", "https", "http+insecure") if _, ok := err.(*koushin.NoUpstreamError); ok { return nil, nil } else if err != nil { return nil, fmt.Errorf("carddav: failed to parse upstream CardDAV server: %v", err) } switch u.Scheme { case "carddavs": u.Scheme = "https" case "carddav+insecure", "http+insecure": u.Scheme = "http" } if u.Scheme == "" { s, err := carddav.Discover(u.Host) if err != nil { srv.Logger().Printf("carddav: failed to discover CardDAV server: %v", err) return nil, nil } u, err = url.Parse(s) if err != nil { return nil, fmt.Errorf("carddav: Discover returned an invalid URL: %v", err) } } if err := sanityCheckURL(u); err != nil { return nil, fmt.Errorf("carddav: failed to connect to CardDAV server %q: %v", u, err) } srv.Logger().Printf("Configured upstream CardDAV server: %v", u) p := &plugin{ GoPlugin: koushin.GoPlugin{Name: "carddav"}, url: u, homeSetCache: make(map[string]string), } registerRoutes(p) p.Inject("compose.html", func(ctx *koushin.Context, _data koushin.RenderData) error { data := _data.(*koushinbase.ComposeRenderData) c, addressBook, err := p.clientWithAddressBook(ctx.Session) if err == errNoAddressBook { return nil } else if err != nil { return err } query := carddav.AddressBookQuery{ DataRequest: carddav.AddressDataRequest{ Props: []string{vcard.FieldFormattedName, vcard.FieldEmail}, }, PropFilters: []carddav.PropFilter{{ Name: vcard.FieldEmail, }}, } addrs, err := c.QueryAddressBook(addressBook.Path, &query) if err != nil { return fmt.Errorf("failed to query CardDAV addresses: %v", err) } // TODO: cache the results emails := make([]string, 0, len(addrs)) for _, addr := range addrs { cardEmails := addr.Card.Values(vcard.FieldEmail) emails = append(emails, cardEmails...) } data.Extra["EmailSuggestions"] = emails return nil }) return p.Plugin(), nil } func init() { koushin.RegisterPluginLoader(func(s *koushin.Server) ([]koushin.Plugin, error) { p, err := newPlugin(s) if err != nil { return nil, err } if p == nil { return nil, nil } return []koushin.Plugin{p}, err }) }