go-gemini/examples/auth.go
2020-12-17 21:10:53 -05:00

91 lines
1.8 KiB
Go

// +build ignore
package main
import (
"crypto/sha512"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"fmt"
"log"
"time"
"git.sr.ht/~adnano/go-gemini"
)
type User struct {
Name string
}
var (
// Map of certificate hashes to users
users = map[string]*User{}
)
func main() {
var mux gemini.ServeMux
mux.HandleFunc("/", profile)
mux.HandleFunc("/username", changeUsername)
var server gemini.Server
if err := server.Certificates.Load("/var/lib/gemini/certs"); err != nil {
log.Fatal(err)
}
server.CreateCertificate = func(hostname string) (tls.Certificate, error) {
return gemini.CreateCertificate(gemini.CertificateOptions{
Subject: pkix.Name{
CommonName: hostname,
},
DNSNames: []string{hostname},
Duration: time.Hour,
})
}
server.Register("localhost", &mux)
if err := server.ListenAndServe(); err != nil {
log.Fatal(err)
}
}
func fingerprint(cert *x509.Certificate) string {
b := sha512.Sum512(cert.Raw)
return string(b[:])
}
func profile(w *gemini.ResponseWriter, r *gemini.Request) {
if r.Certificate == nil {
w.WriteStatus(gemini.StatusCertificateRequired)
return
}
fingerprint := fingerprint(r.Certificate.Leaf)
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(w *gemini.ResponseWriter, r *gemini.Request) {
if r.Certificate == nil {
w.WriteStatus(gemini.StatusCertificateRequired)
return
}
username, ok := gemini.Input(r)
if !ok {
w.WriteHeader(gemini.StatusInput, "Username")
return
}
fingerprint := fingerprint(r.Certificate.Leaf)
user, ok := users[fingerprint]
if !ok {
user = &User{}
users[fingerprint] = user
}
user.Name = username
w.WriteHeader(gemini.StatusRedirect, "/")
}