MM-29987 Implement new collapsed threads API (#16091)

api4/api.go

@@ -21,6 +21,8 @@ type Routes struct {
 
 	Users          *mux.Router // 'api/v4/users'
 	User           *mux.Router // 'api/v4/users/{user_id:[A-Za-z0-9]+}'
+	UserThreads    *mux.Router // 'api/v4/users/{user_id:[A-Za-z0-9]+}/threads'
+	UserThread     *mux.Router // 'api/v4/users/{user_id:[A-Za-z0-9]+}/threads/{thread_id:[A-Za-z0-9]+}'
 	UserByUsername *mux.Router // 'api/v4/users/username/{username:[A-Za-z0-9\\_\\-\\.]+}'
 	UserByEmail    *mux.Router // 'api/v4/users/email/{email:.+}'
 
@@ -141,6 +143,8 @@ func Init(configservice configservice.ConfigService, globalOptionsFunc app.AppOp
 
 	api.BaseRoutes.Users = api.BaseRoutes.ApiRoot.PathPrefix("/users").Subrouter()
 	api.BaseRoutes.User = api.BaseRoutes.ApiRoot.PathPrefix("/users/{user_id:[A-Za-z0-9]+}").Subrouter()
+	api.BaseRoutes.UserThreads = api.BaseRoutes.ApiRoot.PathPrefix("/users/{user_id:[A-Za-z0-9]+}/threads").Subrouter()
+	api.BaseRoutes.UserThread = api.BaseRoutes.ApiRoot.PathPrefix("/users/{user_id:[A-Za-z0-9]+}/threads/{thread_id:[A-Za-z0-9]+}").Subrouter()
 	api.BaseRoutes.UserByUsername = api.BaseRoutes.Users.PathPrefix("/username/{username:[A-Za-z0-9\\_\\-\\.]+}").Subrouter()
 	api.BaseRoutes.UserByEmail = api.BaseRoutes.Users.PathPrefix("/email/{email:.+}").Subrouter()