package rushlink import ( "fmt" "log" "net/http" "runtime/debug" "strconv" "time" "gitea.hashru.nl/dsprenkels/rushlink/internal/db" "github.com/gorilla/mux" ) const urlKeyExpr = "{key:[A-Za-z0-9-_]{4,}}" const urlKeyWithExtExpr = urlKeyExpr + "{ext:\\.[A-Za-z0-9-_]+}" type rushlink struct { db *db.Database fs *db.FileStore } func recoveryMiddleware(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { defer func() { defer func() { if err := recover(); err != nil { log.Printf("error: panic while recovering from another panic: %v\n", err) debug.PrintStack() fmt.Fprintf(w, "internal server error: %v\n", err) } }() if err := recover(); err != nil { log.Printf("error: %v\n", err) debug.PrintStack() renderInternalServerError(w, r, err) } }() next.ServeHTTP(w, r) }) } type statusResponseWriter struct { Inner http.ResponseWriter StatusCode int } func (w *statusResponseWriter) Header() http.Header { return w.Inner.Header() } func (w *statusResponseWriter) Write(buf []byte) (int, error) { if w.StatusCode == 0 { w.WriteHeader(http.StatusOK) } return w.Inner.Write(buf) } func (w *statusResponseWriter) WriteHeader(statusCode int) { w.StatusCode = statusCode w.Inner.WriteHeader(statusCode) } func metricsMiddleware(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { srw := statusResponseWriter{Inner: w} next.ServeHTTP(&srw, r) status := strconv.Itoa(srw.StatusCode) metricRequestsTotalCounter.WithLabelValues(status, r.Method).Inc() }) } // StartMainServer starts the main http server listening on addr. func StartMainServer(addr string, db *db.Database, fs *db.FileStore) { rl := rushlink{ db: db, fs: fs, } // Initialize Gorilla router router := mux.NewRouter() router.Use(recoveryMiddleware) router.Use(metricsMiddleware) router.HandleFunc("/uploads/{id:[A-Za-z0-9-_]+}/{filename:.+}", rl.uploadFileGetHandler).Methods("GET", "HEAD") router.HandleFunc("/", rl.indexGetHandler).Methods("GET", "HEAD") router.HandleFunc("/", rl.newPasteHandler).Methods("POST") router.HandleFunc("/"+urlKeyExpr, rl.viewPasteHandler).Methods("GET", "HEAD") router.HandleFunc("/"+urlKeyWithExtExpr, rl.viewPasteHandler).Methods("GET", "HEAD") router.HandleFunc("/"+urlKeyExpr+"/nr", rl.viewPasteHandlerNoRedirect).Methods("GET", "HEAD") router.HandleFunc("/"+urlKeyWithExtExpr+"/nr", rl.viewPasteHandlerNoRedirect).Methods("GET", "HEAD") router.HandleFunc("/"+urlKeyExpr+"/meta", rl.viewPasteHandlerMeta).Methods("GET", "HEAD") router.HandleFunc("/"+urlKeyWithExtExpr+"/meta", rl.viewPasteHandlerMeta).Methods("GET", "HEAD") router.HandleFunc("/"+urlKeyExpr, rl.deletePasteHandler).Methods("DELETE") router.HandleFunc("/"+urlKeyWithExtExpr, rl.deletePasteHandler).Methods("DELETE") router.HandleFunc("/"+urlKeyExpr+"/delete", rl.deletePasteHandler).Methods("POST") router.HandleFunc("/"+urlKeyWithExtExpr+"/delete", rl.deletePasteHandler).Methods("POST") srv := &http.Server{ Handler: router, Addr: addr, WriteTimeout: 15 * time.Second, ReadTimeout: 15 * time.Second, } log.Fatal(srv.ListenAndServe()) }