go-gemini/examples/auth.go
2021-02-23 08:43:47 -05:00

89 lines
1.9 KiB
Go

// +build ignore
package main
import (
"context"
"crypto/sha512"
"crypto/x509"
"fmt"
"log"
"time"
"git.sr.ht/~adnano/go-gemini"
"git.sr.ht/~adnano/go-gemini/certificate"
)
type User struct {
Name string
}
var (
// Map of certificate hashes to users
users = map[string]*User{}
)
func main() {
certificates := &certificate.Store{}
certificates.Register("localhost")
if err := certificates.Load("/var/lib/gemini/certs"); err != nil {
log.Fatal(err)
}
mux := &gemini.ServeMux{}
mux.HandleFunc("/", profile)
mux.HandleFunc("/username", changeUsername)
server := &gemini.Server{
Handler: mux,
ReadTimeout: 30 * time.Second,
WriteTimeout: 1 * time.Minute,
GetCertificate: certificates.Get,
}
if err := server.ListenAndServe(context.Background()); err != nil {
log.Fatal(err)
}
}
func fingerprint(cert *x509.Certificate) string {
b := sha512.Sum512(cert.Raw)
return string(b[:])
}
func profile(ctx context.Context, w gemini.ResponseWriter, r *gemini.Request) {
if len(r.TLS.PeerCertificates) == 0 {
w.WriteHeader(gemini.StatusCertificateRequired, "Certificate required")
return
}
fingerprint := fingerprint(r.TLS.PeerCertificates[0])
user, ok := users[fingerprint]
if !ok {
user = &User{}
users[fingerprint] = user
}
fmt.Fprintln(w, "Username:", user.Name)
fmt.Fprintln(w, "=> /username Change username")
}
func changeUsername(ctx context.Context, w gemini.ResponseWriter, r *gemini.Request) {
if len(r.TLS.PeerCertificates) == 0 {
w.WriteHeader(gemini.StatusCertificateRequired, "Certificate required")
return
}
username, err := gemini.QueryUnescape(r.URL.RawQuery)
if err != nil || username == "" {
w.WriteHeader(gemini.StatusInput, "Username")
return
}
fingerprint := fingerprint(r.TLS.PeerCertificates[0])
user, ok := users[fingerprint]
if !ok {
user = &User{}
users[fingerprint] = user
}
user.Name = username
w.WriteHeader(gemini.StatusRedirect, "/")
}