Shared channels plugin APIs for MS Teams plugin (#25805)

New plugin APIs and hooks for accessing Shared Channels service via plugin. 

- RegisterPluginForSharedChannels(opts model.RegisterPluginOpts) (remoteID string, err error)
- UnregisterPluginForSharedChannels(pluginID string) error
- ShareChannel(sc *model.SharedChannel) (*model.SharedChannel, error)
- UpdateSharedChannel(sc *model.SharedChannel) (*model.SharedChannel, error)
- UnshareChannel(channelID string) (unshared bool, err error)
- UpdateSharedChannelCursor(channelID, remoteID string, cusror model.GetPostsSinceForSyncCursor) error
- SyncSharedChannel(channelID string) error
- InviteRemoteToChannel(channelID string, remoteID string, userID string) error
- UninviteRemoteFromChannel(channelID string, remoteID string) error

Hooks
- OnSharedChannelsSyncMsg(msg *model.SyncMsg, rc *model.RemoteCluster) (model.SyncResponse, error)
- OnSharedChannelsPing(rc *model.RemoteCluster) bool

server/public/plugin/product_hooks_generated.go

@@ -139,6 +139,14 @@ type ServeMetricsIFace interface {
 	ServeMetrics(c *Context, w http.ResponseWriter, r *http.Request)
 }
 
+type OnSharedChannelsSyncMsgIFace interface {
+	OnSharedChannelsSyncMsg(msg *model.SyncMsg, rc *model.RemoteCluster) (model.SyncResponse, error)
+}
+
+type OnSharedChannelsPingIFace interface {
+	OnSharedChannelsPing(rc *model.RemoteCluster) bool
+}
+
 type HooksAdapter struct {
 	implemented  map[int]struct{}
 	productHooks any
@@ -431,6 +439,24 @@ func NewAdapter(productHooks any) (*HooksAdapter, error) {
 		return nil, errors.New("hook has ServeMetrics method but does not implement plugin.ServeMetrics interface")
 	}
 
+	// Assessing the type of the productHooks if it individually implements OnSharedChannelsSyncMsg interface.
+	tt = reflect.TypeOf((*OnSharedChannelsSyncMsgIFace)(nil)).Elem()
+
+	if ft.Implements(tt) {
+		a.implemented[OnSharedChannelsSyncMsgID] = struct{}{}
+	} else if _, ok := ft.MethodByName("OnSharedChannelsSyncMsg"); ok {
+		return nil, errors.New("hook has OnSharedChannelsSyncMsg method but does not implement plugin.OnSharedChannelsSyncMsg interface")
+	}
+
+	// Assessing the type of the productHooks if it individually implements OnSharedChannelsPing interface.
+	tt = reflect.TypeOf((*OnSharedChannelsPingIFace)(nil)).Elem()
+
+	if ft.Implements(tt) {
+		a.implemented[OnSharedChannelsPingID] = struct{}{}
+	} else if _, ok := ft.MethodByName("OnSharedChannelsPing"); ok {
+		return nil, errors.New("hook has OnSharedChannelsPing method but does not implement plugin.OnSharedChannelsPing interface")
+	}
+
 	return a, nil
 }
 
@@ -712,3 +738,21 @@ func (a *HooksAdapter) ServeMetrics(c *Context, w http.ResponseWriter, r *http.R
 	a.productHooks.(ServeMetricsIFace).ServeMetrics(c, w, r)
 
 }
+
+func (a *HooksAdapter) OnSharedChannelsSyncMsg(msg *model.SyncMsg, rc *model.RemoteCluster) (model.SyncResponse, error) {
+	if _, ok := a.implemented[OnSharedChannelsSyncMsgID]; !ok {
+		panic("product hooks must implement OnSharedChannelsSyncMsg")
+	}
+
+	return a.productHooks.(OnSharedChannelsSyncMsgIFace).OnSharedChannelsSyncMsg(msg, rc)
+
+}
+
+func (a *HooksAdapter) OnSharedChannelsPing(rc *model.RemoteCluster) bool {
+	if _, ok := a.implemented[OnSharedChannelsPingID]; !ok {
+		panic("product hooks must implement OnSharedChannelsPing")
+	}
+
+	return a.productHooks.(OnSharedChannelsPingIFace).OnSharedChannelsPing(rc)
+
+}