improve the wopi app driver

changelog/unreleased/wopi-driver-improvements.md

@@ -0,0 +1,6 @@
+Enhancement: The wopi app driver supports more options
+
+We now generate a folderurl that is used in the wopi protocol to provide an endpoint to go back from the app to the containing folder in the file list. In addition to that we now inlclude the UI_LLCC parameter in the app open URL.
+
+https://github.com/cs3org/reva/pull/3290
+https://learn.microsoft.com/en-us/microsoft-365/cloud-storage-partner-program/online/discovery#ui_llcc

pkg/app/provider/wopi/wopi.go

@@ -59,6 +59,7 @@ func init() {
 type config struct {
 	IOPSecret           string `mapstructure:"iop_secret" docs:";The IOP secret used to connect to the wopiserver."`
 	WopiURL             string `mapstructure:"wopi_url" docs:";The wopiserver's URL."`
+	PrivateLinkBaseURL  string `mapstructure:"private_link_base_url" docs:";The base URL to generate private links to navigate back from apps."`
 	AppName             string `mapstructure:"app_name" docs:";The App user-friendly name."`
 	AppIconURI          string `mapstructure:"app_icon_uri" docs:";A URI to a static asset which represents the app icon."`
 	AppURL              string `mapstructure:"app_url" docs:";The App URL."`
@@ -140,6 +141,13 @@ func (p *wopiProvider) GetAppURL(ctx context.Context, resource *provider.Resourc
 	q.Add("fileid", resource.GetId().OpaqueId)
 	q.Add("viewmode", viewMode.String())
 
+	privateLinkBaseURl, err := url.Parse(p.conf.PrivateLinkBaseURL)
+	if err != nil {
+		return nil, err
+	}
+	privateLinkBaseURl.Path = path.Join(privateLinkBaseURl.Path, "f", storagespace.FormatResourceID(*resource.GetId()))
+	q.Add("folderurl", privateLinkBaseURl.String())
+
 	u, ok := ctxpkg.ContextGetUser(ctx)
 	if ok { // else defaults to "Guest xyz"
 		if u.Id.Type == userpb.UserType_USER_TYPE_LIGHTWEIGHT || u.Id.Type == userpb.UserType_USER_TYPE_FEDERATED {
@@ -242,10 +250,9 @@ func (p *wopiProvider) GetAppURL(ctx context.Context, resource *provider.Resourc
 			return nil, err
 		}
 		urlQuery := url.Query()
-		// we could improve this by using the UI_LLCC value from the wopi discovery url
-		// https://docs.microsoft.com/en-us/microsoft-365/cloud-storage-partner-program/online/discovery#ui_llcc
-		urlQuery.Set("ui", language)   // OnlyOffice
-		urlQuery.Set("lang", language) // Collabora
+		urlQuery.Set("ui", language)      // OnlyOffice
+		urlQuery.Set("lang", language)    // Collabora
+		urlQuery.Set("UI_LLCC", language) // Office365
 		url.RawQuery = urlQuery.Encode()
 		appFullURL = url.String()
 	}