[overlays] Add WebDAV support for remote Overlay editing

Signed-off-by: Knut Ahlers <knut@ahlers.me>

authMiddleware.go

@@ -43,8 +43,17 @@ func fillAuthToken(token *configAuthToken) error {
 
 func writeAuthMiddleware(h http.Handler, module string) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		token := r.Header.Get("Authorization")
-		if token == "" {
+		_, pass, hasBasicAuth := r.BasicAuth()
+
+		var token string
+		switch {
+		case hasBasicAuth && pass != "":
+			token = pass
+
+		case r.Header.Get("Authorization") != "":
+			token = r.Header.Get("Authorization")
+
+		default:
 			http.Error(w, "auth not successful", http.StatusForbidden)
 			return
 		}

docs/content/overlays/_index.md

@@ -40,3 +40,25 @@ Here you can see the Debug Overlay configured with:
 As those parameters are configured through the URL hash (`#...`) they are never sent to the server, therefore are not logged in any access-logs and exist only in the local URL. So with a custom overlay you would put `https://your-bot.example.com/overlays/myoverlay.html#token=55cdb1e4-c776-4467-8560-a47a4abc55de` into your OBS browser source and your overlay would be able to communicate with the bot.
 
 The debug-overlay can be used to view all events received within the bot you can react on in overlays and bot rules.
+
+## Remote editing Overlays with local Editor
+
+In order to enable you to edit the overlays remotely when hosting the bot on a server the bot exposes a WebDAV interface you can locally mount and work on using your favorite editor. To mount the WebDAV I recommend [rclone](https://rclone.org/). You will need the URL your bot is available at and a token with `overlays` permission:
+
+```
+# rclone obscure 55cdb1e4-c776-4467-8560-a47a4abc55de
+MqO0FLdbg3txom2IpUMsVVIqnHwYDefms4EKRqoV1MGhCFkBmWnhvVRdqTyCSFtmvP-AYg
+
+# cat /tmp/rclone.conf
+[bot]
+type = webdav
+url = https://your-bot.example.com/overlays/dav/
+user = dav
+pass = MqO0FLdbg3txom2IpUMsVVIqnHwYDefms4EKRqoV1MGhCFkBmWnhvVRdqTyCSFtmvP-AYg
+
+# rclone --config /tmp/rclone.conf mount bot:/ /tmp/bot-overlays
+
+# code /tmp/bot-overlays
+```
+
+What I've done here is to obscure the token (`rclone` wants the token to be in an obscured format), create a config containing the WebDAV remote, mount the WebDAV remote to a local directory and open it with VSCode to edit the overlays. When saving the files locally `rclone` will upload them to the bot and refreshing the overlay in your browser / OBS will give you the new version.

internal/apimodules/overlays/dav.go

@@ -0,0 +1,29 @@
+package overlays
+
+import (
+	"net/http"
+	"os"
+
+	"github.com/sirupsen/logrus"
+	"golang.org/x/net/webdav"
+)
+
+func getDAVHandler() http.HandlerFunc {
+	overlaysDir := os.Getenv("OVERLAYS_DIR")
+	if ds, err := os.Stat(overlaysDir); err != nil || overlaysDir == "" || !ds.IsDir() {
+		return http.NotFound
+	}
+
+	return (&webdav.Handler{
+		Prefix:     "/overlays/dav",
+		FileSystem: webdav.Dir(overlaysDir),
+		LockSystem: webdav.NewMemLS(),
+		Logger: func(r *http.Request, err error) {
+			logger := logrus.WithField("module", "overlays-dav")
+			if err != nil {
+				logger = logger.WithError(err)
+			}
+			logger.Debugf("%s %s", r.Method, r.URL)
+		},
+	}).ServeHTTP
+}

internal/apimodules/overlays/overlays.go

@@ -154,6 +154,20 @@ func Register(args plugins.RegistrationArguments) (err error) {
 		return fmt.Errorf("registering API route: %w", err)
 	}
 
+	if err = args.RegisterAPIRoute(plugins.HTTPRouteRegistrationArgs{
+		Description:       "Shares the overlays folder as WebDAV filesystem",
+		HandlerFunc:       getDAVHandler(),
+		IsPrefix:          true,
+		Module:            "overlays",
+		Name:              "WebDAV Overlays",
+		Path:              "/dav/",
+		RequiresWriteAuth: true,
+		ResponseType:      plugins.HTTPRouteResponseTypeMultiple,
+		SkipDocumentation: true,
+	}); err != nil {
+		return fmt.Errorf("registering API route: %w", err)
+	}
+
 	if err = args.RegisterAPIRoute(plugins.HTTPRouteRegistrationArgs{
 		HandlerFunc:       handleServeOverlayAsset,
 		IsPrefix:          true,

plugins_core.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net/http"
 
+	"github.com/gorilla/mux"
 	"github.com/pkg/errors"
 	log "github.com/sirupsen/logrus"
 	"gopkg.in/irc.v4"
@@ -134,13 +135,15 @@ func registerRoute(route plugins.HTTPRouteRegistrationArgs) error {
 		hdl = writeAuthMiddleware(hdl, route.Module)
 	}
 
+	var muxRoute *mux.Route
 	if route.IsPrefix {
-		r.PathPrefix(route.Path).
-			Handler(hdl).
-			Methods(route.Method)
+		muxRoute = r.PathPrefix(route.Path).Handler(hdl)
 	} else {
-		r.Handle(route.Path, hdl).
-			Methods(route.Method)
+		muxRoute = r.Handle(route.Path, hdl)
+	}
+
+	if route.Method != "" {
+		muxRoute.Methods(route.Method)
 	}
 
 	if !route.SkipDocumentation {