PLT-6403: Interactive messages (#7274)

* wip

* finish first pass

* requested changes

* add DoPostAction to Client4

api4/context.go

@@ -586,3 +586,14 @@ func (c *Context) RequireJobType() *Context {
 	}
 	return c
 }
+
+func (c *Context) RequireActionId() *Context {
+	if c.Err != nil {
+		return c
+	}
+
+	if len(c.Params.ActionId) != 26 {
+		c.SetInvalidUrlParam("action_id")
+	}
+	return c
+}

api4/params.go

@@ -39,6 +39,7 @@ type ApiParams struct {
 	Service        string
 	JobId          string
 	JobType        string
+	ActionId       string
 	Page           int
 	PerPage        int
 	Permanent      bool
@@ -137,6 +138,10 @@ func ApiParamsFromRequest(r *http.Request) *ApiParams {
 		params.JobType = val
 	}
 
+	if val, ok := props["action_id"]; ok {
+		params.ActionId = val
+	}
+
 	if val, err := strconv.Atoi(r.URL.Query().Get("page")); err != nil || val < 0 {
 		params.Page = PAGE_DEFAULT
 	} else {

api4/post.go

@@ -27,6 +27,7 @@ func InitPost() {
 	BaseRoutes.Team.Handle("/posts/search", ApiSessionRequired(searchPosts)).Methods("POST")
 	BaseRoutes.Post.Handle("", ApiSessionRequired(updatePost)).Methods("PUT")
 	BaseRoutes.Post.Handle("/patch", ApiSessionRequired(patchPost)).Methods("PUT")
+	BaseRoutes.Post.Handle("/actions/{action_id:[A-Za-z0-9]+}", ApiSessionRequired(doPostAction)).Methods("POST")
 	BaseRoutes.Post.Handle("/pin", ApiSessionRequired(pinPost)).Methods("POST")
 	BaseRoutes.Post.Handle("/unpin", ApiSessionRequired(unpinPost)).Methods("POST")
 }
@@ -428,3 +429,22 @@ func getFileInfosForPost(c *Context, w http.ResponseWriter, r *http.Request) {
 		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 !app.SessionHasPermissionToChannelByPost(c.Session, c.Params.PostId, model.PERMISSION_READ_CHANNEL) {
+		c.SetPermissionError(model.PERMISSION_READ_CHANNEL)
+		return
+	}
+
+	if err := app.DoPostAction(c.Params.PostId, c.Params.ActionId, c.Session.UserId); err != nil {
+		c.Err = err
+		return
+	}
+
+	ReturnStatusOK(w)
+}