mattn/upload.go

## upload.go
package main

import (
	"crypto/sha1"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"os"
	"path/filepath"
)

const indexPage = `
<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
</head>
<body>
	<form action="/" method="POST" enctype="multipart/form-data">
	<input type="file" name="image1">
	<input type="submit">
	</form>
</body>
</html>
`

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		if r.Method == "GET" {
			if r.URL.Path == "/" {
				fmt.Fprintf(w, indexPage)
			} else {
				if f, e := filepath.Abs(r.URL.Path); e == nil {
					http.ServeFile(w, r, f)
				} else {
					http.Error(w, e.Error(), http.StatusNotFound)
				}
			}
		} else {
			var e error
			var f io.Writer
			var m multipart.File
			var hex string

			if m, _, e = r.FormFile("image1"); e == nil {
				sha1h := sha1.New()
				if _, e = io.Copy(sha1h, m); e == nil {
					m.Seek(0, os.SEEK_SET)
					hex = fmt.Sprintf("%x", sha1h.Sum(nil))
					if f, e = os.Create(hex + ".png"); e == nil {
						_, e = io.Copy(f, m)
					}
				}
			}
			if e == nil {
				http.Redirect(w, r, hex+".png", 302)
			} else {
				http.Error(w, e.Error(), http.StatusInternalServerError)
			}
		}
	})
	http.ListenAndServe(":8080", nil)
}
	package main

	import (
	"crypto/sha1"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"os"
	"path/filepath"
	)

	const indexPage = `
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	</head>
	<body>
	<form action="/" method="POST" enctype="multipart/form-data">
	<input type="file" name="image1">
	<input type="submit">
	</form>
	</body>
	</html>
	`

	func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
	if r.Method == "GET" {
	if r.URL.Path == "/" {
	fmt.Fprintf(w, indexPage)
	} else {
	if f, e := filepath.Abs(r.URL.Path); e == nil {
	http.ServeFile(w, r, f)
	} else {
	http.Error(w, e.Error(), http.StatusNotFound)
	}
	}
	} else {
	var e error
	var f io.Writer
	var m multipart.File
	var hex string

	if m, _, e = r.FormFile("image1"); e == nil {
	sha1h := sha1.New()
	if _, e = io.Copy(sha1h, m); e == nil {
	m.Seek(0, os.SEEK_SET)
	hex = fmt.Sprintf("%x", sha1h.Sum(nil))
	if f, e = os.Create(hex + ".png"); e == nil {
	_, e = io.Copy(f, m)
	}
	}
	}
	if e == nil {
	http.Redirect(w, r, hex+".png", 302)
	} else {
	http.Error(w, e.Error(), http.StatusInternalServerError)
	}
	}
	})
	http.ListenAndServe(":8080", nil)
	}