Simple Server
This is a small golang program to serve files via http. The files are restricted to the base directory and its children, or a specified directory. You will see a nice directory listing in the browser. It is meant to be used with *.html, *.png, and other files.
To use it: go build && ./simpleserver ..
Then in your browser, navigate to: http://localhost:8000/
| . (dummy file to change name of gist) |
| package main | |
| // Serve a web page for files. | |
| // | |
| // To see cache behavior: curl -I localhost:8000/foo | |
| // See also: http FileServer example (DotFileHiding, StripPrefix), and Dir(). | |
| import ( | |
| "log" | |
| "net/http" | |
| "os" | |
| "path/filepath" | |
| "strings" | |
| ) | |
| const port = ":8001" | |
| var baseDir = "." | |
| // Serve a file | |
| func handleServeFile(w http.ResponseWriter, r *http.Request) { | |
| // log.Printf("Got a request for serve file:%s\n", r.URL.Path) | |
| // log.Printf(" Method:%s\n", r.Method) | |
| // log.Printf(" Path:%s\n", r.URL.Path) | |
| // log.Printf(" Query:%v\n", r.URL.Query()) | |
| file := r.URL.Path | |
| // We guard against "..", which also disallows filename having two dots. | |
| // This is actually unnecessary since http.ServerFile also does a check, and | |
| // their check is smarter. | |
| if strings.Contains(file, "..") { | |
| log.Println("Disallowed:" + file) | |
| w.WriteHeader(http.StatusNotFound) | |
| return | |
| } | |
| path := filepath.Join(baseDir, file) | |
| log.Println(path) | |
| http.ServeFile(w, r, path) | |
| } | |
| func main() { | |
| log.SetFlags(log.Flags() | log.Lmicroseconds) | |
| if len(os.Args) == 2 { | |
| baseDir = os.Args[1] | |
| } else if len(os.Args) != 1 { | |
| log.Fatalf("Expecting either no arguments or the base directory") | |
| } | |
| // We must specify the baseDir as absolute, because ServeFile will reject | |
| // requests where r.URL.Path contains a ".." path element. | |
| log.Printf("Using as base directory::%s\n", baseDir) | |
| var err error | |
| baseDir, err = filepath.Abs(baseDir) | |
| if err != nil { | |
| log.Fatal("Cannot get absolute directory for the base directory:", baseDir) | |
| } | |
| log.Printf("Using as base directory::%s\n", baseDir) | |
| log.Printf("About to serve on port:%s\n", port) | |
| http.HandleFunc("/", handleServeFile) | |
| if err := http.ListenAndServe(port, nil); err != nil { | |
| panic(err) | |
| } | |
| } |