APIv4 GET /users/{user_id}/posts/flagged (#5984)

* APIv4 GET /users/{user_id}/posts/flagged

* change permission check

api4/api.go

@@ -47,6 +47,7 @@ type Routes struct {
 	Posts           *mux.Router // 'api/v4/posts'
 	Post            *mux.Router // 'api/v4/posts/{post_id:[A-Za-z0-9]+}'
 	PostsForChannel *mux.Router // 'api/v4/channels/{channel_id:[A-Za-z0-9]+}/posts'
+	PostsForUser    *mux.Router // 'api/v4/users/{user_id:[A-Za-z0-9]+}/posts'
 
 	Files *mux.Router // 'api/v4/files'
 	File  *mux.Router // 'api/v4/files/{file_id:[A-Za-z0-9]+}'
@@ -126,6 +127,7 @@ func InitApi(full bool) {
 	BaseRoutes.Posts = BaseRoutes.ApiRoot.PathPrefix("/posts").Subrouter()
 	BaseRoutes.Post = BaseRoutes.Posts.PathPrefix("/{post_id:[A-Za-z0-9]+}").Subrouter()
 	BaseRoutes.PostsForChannel = BaseRoutes.Channel.PathPrefix("/posts").Subrouter()
+	BaseRoutes.PostsForUser = BaseRoutes.User.PathPrefix("/posts").Subrouter()
 
 	BaseRoutes.Files = BaseRoutes.ApiRoot.PathPrefix("/files").Subrouter()
 	BaseRoutes.File = BaseRoutes.Files.PathPrefix("/{file_id:[A-Za-z0-9]+}").Subrouter()