feat: tailscale oauth

internal/providers/tailscale.go

@@ -0,0 +1,56 @@
+package providers
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+
+	"github.com/rs/zerolog/log"
+	"golang.org/x/oauth2"
+)
+
+type TailscaleUser struct {
+	LoginName string `json:"loginName"`
+}
+
+type TailscaleUserInfoResponse struct {
+	Users []TailscaleUser `json:"users"`
+}
+
+func TailscaleScopes() []string {
+	return []string{"users:read"}
+}
+
+var TailscaleEndpoint = oauth2.Endpoint{
+	TokenURL: "https://api.tailscale.com/api/v2/oauth/token",
+}
+
+func GetTailscaleEmail(client *http.Client) (string, error) {
+	res, resErr := client.Get("https://api.tailscale.com/api/v2/tailnet/-/users")
+
+	if resErr != nil {
+		return "", resErr
+	}
+
+	log.Debug().Msg("Got response from tailscale")
+
+	body, bodyErr := io.ReadAll(res.Body)
+
+	if bodyErr != nil {
+		return "", bodyErr
+	}
+
+	log.Debug().Msg("Read body from tailscale")
+
+	var users TailscaleUserInfoResponse
+
+	jsonErr := json.Unmarshal(body, &users)
+
+	if jsonErr != nil {
+		return "", jsonErr
+	}
+
+	log.Debug().Msg("Parsed users from tailscale")
+
+	return users.Users[0].LoginName, nil
+}