package common import ( "log" "net/http" "runtime/debug" "strings" "sync" "github.com/Azareal/Gosora/common/phrases" ) type ErrorItem struct { error Stack []byte } // ! The errorBuffer uses o(n) memory, we should probably do something about that // TODO: Use the errorBuffer variable to construct the system log in the Control Panel. Should we log errors caused by users too? Or just collect statistics on those or do nothing? Intercept recover()? Could we intercept the logger instead here? We might get too much information, if we intercept the logger, maybe make it part of the Debug page? // ? - Should we pass Header / HeaderLite rather than forcing the errors to pull the global Header instance? var errorBufferMutex sync.RWMutex var errorBuffer []ErrorItem //var notfoundCountPerSecond int //var nopermsCountPerSecond int // A blank list to fill out that parameter in Page for routes which don't use it var tList []interface{} // WIP, a new system to propagate errors up from routes type RouteError interface { Type() string Error() string Cause() string JSON() bool Handled() bool Wrap(string) } type RouteErrorImpl struct { userText string sysText string system bool json bool handled bool } func (err *RouteErrorImpl) Type() string { // System errors may contain sensitive information we don't want the user to see if err.system { return "system" } return "user" } func (err *RouteErrorImpl) Error() string { return err.userText } func (err *RouteErrorImpl) Cause() string { if err.sysText == "" { return err.Error() } return err.sysText } // Respond with JSON? func (err *RouteErrorImpl) JSON() bool { return err.json } // Has this error been dealt with elsewhere? func (err *RouteErrorImpl) Handled() bool { return err.handled } // Move the current error into the system error slot and add a new one to the user error slot to show the user func (err *RouteErrorImpl) Wrap(userErr string) { err.sysText = err.userText err.userText = userErr } func HandledRouteError() RouteError { return &RouteErrorImpl{"", "", false, false, true} } func Error(errmsg string) RouteError { return &RouteErrorImpl{errmsg, "", false, false, false} } func FromError(err error) RouteError { return &RouteErrorImpl{err.Error(), "", false, false, false} } func ErrorJSQ(errmsg string, isJs bool) RouteError { return &RouteErrorImpl{errmsg, "", false, isJs, false} } func SysError(errmsg string) RouteError { return &RouteErrorImpl{errmsg, errmsg, true, false, false} } // LogError logs internal handler errors which can't be handled with InternalError() as a wrapper for log.Fatal(), we might do more with it in the future. // TODO: Clean-up extra as a way of passing additional context func LogError(err error, extra ...string) { LogWarning(err, extra...) log.Fatal("") } func LogWarning(err error, extra ...string) { var errmsg string for _, extraBit := range extra { errmsg += extraBit + "\n" } if err == nil { errmsg += "Unknown error" } else { errmsg += err.Error() } errorBufferMutex.Lock() defer errorBufferMutex.Unlock() stack := debug.Stack() // debug.Stack() can't be executed concurrently, so we'll guard this with a mutex too log.Print(errmsg+"\n", string(stack)) errorBuffer = append(errorBuffer, ErrorItem{err, stack}) } func errorHeader(w http.ResponseWriter, user User, title string) *Header { header := DefaultHeader(w, user) header.Title = title header.Zone = "error" return header } // TODO: Dump the request? // InternalError is the main function for handling internal errors, while simultaneously printing out a page for the end-user to let them know that *something* has gone wrong // ? - Add a user parameter? func InternalError(err error, w http.ResponseWriter, r *http.Request) RouteError { w.WriteHeader(500) pi := ErrorPage{errorHeader(w, GuestUser, phrases.GetErrorPhrase("internal_error_title")), phrases.GetErrorPhrase("internal_error_body")} handleErrorTemplate(w, r, pi) LogError(err) return HandledRouteError() } // InternalErrorJSQ is the JSON "maybe" version of InternalError which can handle both JSON and normal requests // ? - Add a user parameter? func InternalErrorJSQ(err error, w http.ResponseWriter, r *http.Request, isJs bool) RouteError { if !isJs { return InternalError(err, w, r) } return InternalErrorJS(err, w, r) } // InternalErrorJS is the JSON version of InternalError on routes we know will only be requested via JSON. E.g. An API. // ? - Add a user parameter? func InternalErrorJS(err error, w http.ResponseWriter, r *http.Request) RouteError { w.WriteHeader(500) writeJsonError(phrases.GetErrorPhrase("internal_error_body"), w) LogError(err) return HandledRouteError() } // When the task system detects if the database is down, some database errors might slip by this func DatabaseError(w http.ResponseWriter, r *http.Request) RouteError { w.WriteHeader(500) pi := ErrorPage{errorHeader(w, GuestUser, phrases.GetErrorPhrase("internal_error_title")), phrases.GetErrorPhrase("internal_error_body")} handleErrorTemplate(w, r, pi) return HandledRouteError() } func InternalErrorXML(err error, w http.ResponseWriter, r *http.Request) RouteError { w.Header().Set("Content-Type", "application/xml") w.WriteHeader(500) w.Write([]byte(` ` + phrases.GetErrorPhrase("internal_error_body") + ``)) LogError(err) return HandledRouteError() } // TODO: Stop killing the instance upon hitting an error with InternalError* and deprecate this func SilentInternalErrorXML(err error, w http.ResponseWriter, r *http.Request) RouteError { w.Header().Set("Content-Type", "application/xml") w.WriteHeader(500) w.Write([]byte(` ` + phrases.GetErrorPhrase("internal_error_body") + ``)) log.Print("InternalError: ", err) return HandledRouteError() } func PreError(errmsg string, w http.ResponseWriter, r *http.Request) RouteError { w.WriteHeader(500) pi := ErrorPage{errorHeader(w, GuestUser, phrases.GetErrorPhrase("error_title")), errmsg} handleErrorTemplate(w, r, pi) return HandledRouteError() } func PreErrorJS(errmsg string, w http.ResponseWriter, r *http.Request) RouteError { w.WriteHeader(500) writeJsonError(errmsg, w) return HandledRouteError() } func PreErrorJSQ(errmsg string, w http.ResponseWriter, r *http.Request, isJs bool) RouteError { if !isJs { return PreError(errmsg, w, r) } return PreErrorJS(errmsg, w, r) } // LocalError is an error shown to the end-user when something goes wrong and it's not the software's fault // TODO: Pass header in for this and similar errors instead of having to pass in both user and w? Would also allow for more stateful things, although this could be a problem func LocalError(errmsg string, w http.ResponseWriter, r *http.Request, user User) RouteError { w.WriteHeader(500) pi := ErrorPage{errorHeader(w, user, phrases.GetErrorPhrase("local_error_title")), errmsg} handleErrorTemplate(w, r, pi) return HandledRouteError() } func LocalErrorJSQ(errmsg string, w http.ResponseWriter, r *http.Request, user User, isJs bool) RouteError { if !isJs { return LocalError(errmsg, w, r, user) } return LocalErrorJS(errmsg, w, r) } func LocalErrorJS(errmsg string, w http.ResponseWriter, r *http.Request) RouteError { w.WriteHeader(500) writeJsonError(errmsg, w) return HandledRouteError() } // TODO: We might want to centralise the error logic in the future and just return what the error handler needs to construct the response rather than handling it here // NoPermissions is an error shown to the end-user when they try to access an area which they aren't authorised to access func NoPermissions(w http.ResponseWriter, r *http.Request, user User) RouteError { w.WriteHeader(403) pi := ErrorPage{errorHeader(w, user, phrases.GetErrorPhrase("no_permissions_title")), phrases.GetErrorPhrase("no_permissions_body")} handleErrorTemplate(w, r, pi) return HandledRouteError() } func NoPermissionsJSQ(w http.ResponseWriter, r *http.Request, user User, isJs bool) RouteError { if !isJs { return NoPermissions(w, r, user) } return NoPermissionsJS(w, r, user) } func NoPermissionsJS(w http.ResponseWriter, r *http.Request, user User) RouteError { w.WriteHeader(403) writeJsonError(phrases.GetErrorPhrase("no_permissions_body"), w) return HandledRouteError() } // ? - Is this actually used? Should it be used? A ban in Gosora should be more of a permission revocation to stop them posting rather than something which spits up an error page, right? func Banned(w http.ResponseWriter, r *http.Request, user User) RouteError { w.WriteHeader(403) pi := ErrorPage{errorHeader(w, user, phrases.GetErrorPhrase("banned_title")), phrases.GetErrorPhrase("banned_body")} handleErrorTemplate(w, r, pi) return HandledRouteError() } // nolint // BannedJSQ is the version of the banned error page which handles both JavaScript requests and normal page loads func BannedJSQ(w http.ResponseWriter, r *http.Request, user User, isJs bool) RouteError { if !isJs { return Banned(w, r, user) } return BannedJS(w, r, user) } func BannedJS(w http.ResponseWriter, r *http.Request, user User) RouteError { w.WriteHeader(403) writeJsonError(phrases.GetErrorPhrase("banned_body"), w) return HandledRouteError() } // nolint func LoginRequiredJSQ(w http.ResponseWriter, r *http.Request, user User, isJs bool) RouteError { if !isJs { return LoginRequired(w, r, user) } return LoginRequiredJS(w, r, user) } // ? - Where is this used? Should we use it more? // LoginRequired is an error shown to the end-user when they try to access an area which requires them to login func LoginRequired(w http.ResponseWriter, r *http.Request, user User) RouteError { return CustomError(phrases.GetErrorPhrase("login_required_body"), 401, phrases.GetErrorPhrase("no_permissions_title"), w, r, nil, user) } // nolint func LoginRequiredJS(w http.ResponseWriter, r *http.Request, user User) RouteError { w.WriteHeader(401) writeJsonError(phrases.GetErrorPhrase("login_required_body"), w) return HandledRouteError() } // SecurityError is used whenever a session mismatch is found // ? - Should we add JS and JSQ versions of this? func SecurityError(w http.ResponseWriter, r *http.Request, user User) RouteError { w.WriteHeader(403) pi := ErrorPage{errorHeader(w, user, phrases.GetErrorPhrase("security_error_title")), phrases.GetErrorPhrase("security_error_body")} if RunPreRenderHook("pre_render_security_error", w, r, &user, &pi) { return nil } err := pi.Header.Theme.RunTmpl("error", pi, w) if err != nil { LogError(err) } return HandledRouteError() } func MicroNotFound(w http.ResponseWriter, r *http.Request) RouteError { w.WriteHeader(404) _, _ = w.Write([]byte("file not found")) return HandledRouteError() } // NotFound is used when the requested page doesn't exist // ? - Add a JSQ version of this? // ? - Add a user parameter? func NotFound(w http.ResponseWriter, r *http.Request, header *Header) RouteError { return CustomError(phrases.GetErrorPhrase("not_found_body"), 404, phrases.GetErrorPhrase("not_found_title"), w, r, header, GuestUser) } // ? - Add a user parameter? func NotFoundJS(w http.ResponseWriter, r *http.Request) RouteError { w.WriteHeader(404) writeJsonError(phrases.GetErrorPhrase("not_found_body"), w) return HandledRouteError() } func NotFoundJSQ(w http.ResponseWriter, r *http.Request, header *Header, js bool) RouteError { if js { return NotFoundJS(w, r) } if header == nil { header = DefaultHeader(w, GuestUser) } return NotFound(w, r, header) } // CustomError lets us make custom error types which aren't covered by the generic functions above func CustomError(errmsg string, errcode int, errtitle string, w http.ResponseWriter, r *http.Request, header *Header, user User) RouteError { if header == nil { header = DefaultHeader(w, user) } header.Title = errtitle header.Zone = "error" w.WriteHeader(errcode) pi := ErrorPage{header, errmsg} handleErrorTemplate(w, r, pi) return HandledRouteError() } // CustomErrorJSQ is a version of CustomError which lets us handle both JSON and regular pages depending on how it's being accessed func CustomErrorJSQ(errmsg string, errcode int, errtitle string, w http.ResponseWriter, r *http.Request, header *Header, user User, isJs bool) RouteError { if !isJs { return CustomError(errmsg, errcode, errtitle, w, r, header, user) } return CustomErrorJS(errmsg, errcode, w, r, user) } // CustomErrorJS is the pure JSON version of CustomError func CustomErrorJS(errmsg string, errcode int, w http.ResponseWriter, r *http.Request, user User) RouteError { w.WriteHeader(errcode) writeJsonError(errmsg, w) return HandledRouteError() } // TODO: Should we optimise this by caching these json strings? func writeJsonError(errmsg string, w http.ResponseWriter) { _, _ = w.Write([]byte(`{"errmsg":"` + strings.Replace(errmsg, "\"", "", -1) + `"}`)) } func handleErrorTemplate(w http.ResponseWriter, r *http.Request, pi ErrorPage) { // TODO: What to do about this hook? if RunPreRenderHook("pre_render_error", w, r, &pi.Header.CurrentUser, &pi) { return } err := pi.Header.Theme.RunTmpl("error", pi, w) if err != nil { LogError(err) } }