MM-12843 Add interactive dialogs (#9816)

* Add interactive dialogs

* Fix unit test

* Updates per feedback

* Fix typo

* Updates per feedback, add icon_url and error returns

* Updates per feedback

* Update per feedback

api4/post.go

@@ -25,7 +25,6 @@ func (api *API) InitPost() {
 	api.BaseRoutes.Team.Handle("/posts/search", api.ApiSessionRequired(searchPosts)).Methods("POST")
 	api.BaseRoutes.Post.Handle("", api.ApiSessionRequired(updatePost)).Methods("PUT")
 	api.BaseRoutes.Post.Handle("/patch", api.ApiSessionRequired(patchPost)).Methods("PUT")
-	api.BaseRoutes.Post.Handle("/actions/{action_id:[A-Za-z0-9]+}", api.ApiSessionRequired(doPostAction)).Methods("POST")
 	api.BaseRoutes.Post.Handle("/pin", api.ApiSessionRequired(pinPost)).Methods("POST")
 	api.BaseRoutes.Post.Handle("/unpin", api.ApiSessionRequired(unpinPost)).Methods("POST")
 }
@@ -529,27 +528,3 @@ func getFileInfosForPost(c *Context, w http.ResponseWriter, r *http.Request) {
 	w.Header().Set(model.HEADER_ETAG_SERVER, model.GetEtagForFileInfos(infos))
 	w.Write([]byte(model.FileInfosToJson(infos)))
 }
-
-func doPostAction(c *Context, w http.ResponseWriter, r *http.Request) {
-	c.RequirePostId().RequireActionId()
-	if c.Err != nil {
-		return
-	}
-
-	if !c.App.SessionHasPermissionToChannelByPost(c.Session, c.Params.PostId, model.PERMISSION_READ_CHANNEL) {
-		c.SetPermissionError(model.PERMISSION_READ_CHANNEL)
-		return
-	}
-
-	actionRequest := model.DoPostActionRequestFromJson(r.Body)
-	if actionRequest == nil {
-		actionRequest = &model.DoPostActionRequest{}
-	}
-
-	if err := c.App.DoPostAction(c.Params.PostId, c.Params.ActionId, c.Session.UserId, actionRequest.SelectedOption); err != nil {
-		c.Err = err
-		return
-	}
-
-	ReturnStatusOK(w)
-}