Created
October 17, 2018 17:37
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| // TODO describe program | |
| package main | |
| import ( | |
| "fmt" | |
| "io" | |
| "io/ioutil" | |
| "net/http" | |
| "os" | |
| "strings" | |
| ) | |
| func main() { | |
| if err := run(); err != nil { | |
| os.Stderr.WriteString(err.Error() + "\n") | |
| os.Exit(1) | |
| } | |
| } | |
| func run() error { | |
| return http.ListenAndServe("localhost:8080", http.HandlerFunc(handler)) | |
| } | |
| func handler(w http.ResponseWriter, r *http.Request) { | |
| if r.Method != http.MethodPost { | |
| w.Write([]byte(page)) | |
| return | |
| } | |
| file, header, err := r.FormFile("file") | |
| if err != nil { | |
| http.Error(w, err.Error(), http.StatusBadRequest) | |
| return | |
| } | |
| fmt.Fprintf(w, "request headers:\n\n") | |
| for k, v := range r.Header { | |
| fmt.Fprintf(w, "%s: %s\n", k, strings.Join(v, ", ")) | |
| } | |
| fmt.Fprintln(w, "\nfile header:") | |
| fmt.Fprintf(w, "\tFilename: %q\n\tHeader: %v\n\tSize: %d\n", | |
| header.Filename, header.Header, header.Size) | |
| n, err := io.Copy(ioutil.Discard, file) | |
| fmt.Fprintf(w, "\nfile read: %d bytes, error: %v\n", n, err) | |
| } | |
| const page = `<!doctype html> | |
| <head><title>submit form</title><meta charset=utf-8> | |
| <style>body{font-size:x-large;margin:2em auto;max-width:50%}</style> | |
| <body> | |
| <form method=post enctype=multipart/form-data> | |
| <input id=file type=file name=file> | |
| <input type=submit></form> | |
| ` |
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