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package koushincarddav
import (
"fmt"
"net/http"
"net/url"
"strings"
"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) client(session *koushin.Session) (*carddav.Client, error) {
return newClient(p.url, session)
}
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.TemplateFuncs(map[string]interface{}{
"join": func(l []string, sep string) string {
return strings.Join(l, sep)
},
})
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
})
}
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