1 files changed, 52 insertions, 0 deletions
diff --git a/plugins/carddav/carddav.go b/plugins/carddav/carddav.go
new file mode 100644
index 0000000..55c76b4
--- /dev/null
+++ b/plugins/carddav/carddav.go
@@ -0,0 +1,52 @@
+package koushincarddav
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+
+	"git.sr.ht/~emersion/koushin"
+	"github.com/emersion/go-webdav/carddav"
+)
+
+var errNoAddressBook = fmt.Errorf("carddav: no address book found")
+
+type authRoundTripper struct {
+	upstream http.RoundTripper
+	session  *koushin.Session
+}
+
+func (rt *authRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	rt.session.SetHTTPBasicAuth(req)
+	return rt.upstream.RoundTrip(req)
+}
+
+func getAddressBook(u *url.URL, session *koushin.Session) (*carddav.Client, *carddav.AddressBook, error) {
+	rt := authRoundTripper{
+		upstream: http.DefaultTransport,
+		session:  session,
+	}
+	c, err := carddav.NewClient(&http.Client{Transport: &rt}, u.String())
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to create CardDAV client: %v", err)
+	}
+
+	principal, err := c.FindCurrentUserPrincipal()
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to query CardDAV principal: %v", err)
+	}
+
+	addressBookHomeSet, err := c.FindAddressBookHomeSet(principal)
+	if err != nil {
+		return nil, nil, fmt.Errorf("failed to query CardDAV address book home set: %v", err)
+	}
+
+	addressBooks, err := c.FindAddressBooks(addressBookHomeSet)
+	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
+}