58 lines
1.2 KiB
Go
58 lines
1.2 KiB
Go
// ## Basic Authentication
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package main
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import (
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"net/http"
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"encoding/base64"
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"strings"
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"fmt"
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)
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type Authenticator func(string, string) bool
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func testAuth(r *http.Request, auth Authenticator) bool {
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s := strings.SplitN(r.Header.Get("Authorization"), " ", 2)
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if len(s) != 2 || s[0] != "Basic" {
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return false
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}
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b, err := base64.StdEncoding.DecodeString(s[1])
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if err != nil {
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return false
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}
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pair := strings.SplitN(string(b), ":", 2)
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if len(pair) != 2 {
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return false
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}
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return auth(pair[0], pair[1])
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}
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func requireAuth(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("WWW-Authenticate", `Basic realm="private"`)
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w.WriteHeader(401)
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w.Write([]byte("401 Unauthorized\n"))
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}
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func wrapAuth(h http.HandlerFunc, a Authenticator) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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if testAuth(r, a) {
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h(w, r)
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} else {
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requireAuth(w, r)
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}
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}
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}
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func hello(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintln(w, "Hello secret world!")
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}
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func main() {
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checkPassword := func(_, password string) bool {
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return password == "supersecret"
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}
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handler1 := http.HanderFunc(hello)
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handler2 := wrapAuth(handler1, checkPassword)
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http.ListenAndServe(":5000", handler2)
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}
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