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// +build example
package main
import (
"crypto/tls"
"crypto/x509"
"fmt"
"log"
"git.sr.ht/~adnano/go-gemini"
)
type user struct {
password string // TODO: use hashes
admin bool
}
type session struct {
username string
authorized bool // whether or not the password was supplied
}
var (
// Map of usernames to user data
logins = map[string]user{
"admin": {"p@ssw0rd", true}, // NOTE: These are bad passwords!
"user1": {"password1", false},
"user2": {"password2", false},
}
// Map of certificate fingerprints to sessions
sessions = map[string]*session{}
)
func main() {
// Configure a certificate.
// To generate a TLS key pair, run:
//
// go run -tags=example ../cert
//
cert, err := tls.LoadX509KeyPair("examples/server/localhost.crt", "examples/server/localhost.key")
if err != nil {
log.Fatal(err)
}
handler := &gmi.ServeMux{}
handler.HandleFunc("", welcome)
handler.HandleFunc("/login", login)
handler.HandleFunc("/login/password", loginPassword)
handler.HandleFunc("/profile", profile)
handler.HandleFunc("/admin", admin)
handler.HandleFunc("/logout", logout)
server := &gmi.Server{
Certificate: cert,
Handler: handler,
}
if err := server.ListenAndServe(); err != nil {
log.Fatal(err)
}
}
func getSession(crt *x509.Certificate) (*session, bool) {
fingerprint := gmi.Fingerprint(crt)
session, ok := sessions[fingerprint]
return session, ok
}
func welcome(rw *gmi.ResponseWriter, req *gmi.Request) {
rw.WriteHeader(gmi.StatusSuccess, "text/gemini")
rw.Write([]byte("Welcome to this example.\n=> /login Login\n"))
}
func login(rw *gmi.ResponseWriter, req *gmi.Request) {
if len(req.TLS.PeerCertificates) > 0 {
if username := req.URL.RawQuery; username == "" {
rw.WriteHeader(gmi.StatusInput, "Username")
} else {
fingerprint := gmi.Fingerprint(req.TLS.PeerCertificates[0])
sessions[fingerprint] = &session{
username: username,
}
// TODO: Remove scheme and host once example client can handle relative redirects
rw.WriteHeader(gmi.StatusRedirect, "gemini://localhost/login/password")
}
} else {
rw.WriteHeader(gmi.StatusClientCertificateRequired, "Certificate required")
}
}
func loginPassword(rw *gmi.ResponseWriter, req *gmi.Request) {
if len(req.TLS.PeerCertificates) > 0 {
session, ok := getSession(req.TLS.PeerCertificates[0])
if !ok {
rw.WriteHeader(gmi.StatusCertificateNotAuthorised, "Not authorized")
return
}
if password := req.URL.RawQuery; password == "" {
rw.WriteHeader(gmi.StatusInput, "Password")
} else {
expected := logins[session.username].password
if password == expected {
// TODO: Remove scheme and host once example client can handle relative redirects
session.authorized = true
rw.WriteHeader(gmi.StatusRedirect, "gemini://localhost/profile")
} else {
rw.WriteHeader(gmi.StatusInput, "Wrong password. Please try again")
}
}
} else {
rw.WriteHeader(gmi.StatusClientCertificateRequired, "Certificate required")
}
}
func logout(rw *gmi.ResponseWriter, req *gmi.Request) {
if len(req.TLS.PeerCertificates) > 0 {
fingerprint := gmi.Fingerprint(req.TLS.PeerCertificates[0])
delete(sessions, fingerprint)
}
rw.WriteHeader(gmi.StatusSuccess, "text/gemini")
rw.Write([]byte("Successfully logged out.\n"))
}
func profile(rw *gmi.ResponseWriter, req *gmi.Request) {
if len(req.TLS.PeerCertificates) > 0 {
session, ok := getSession(req.TLS.PeerCertificates[0])
if !ok {
rw.WriteHeader(gmi.StatusCertificateNotAuthorised, "Certificate not authorized")
return
}
user := logins[session.username]
profile := fmt.Sprintf("Username: %s\nAdmin: %t\n=> /logout Logout", session.username, user.admin)
rw.WriteHeader(gmi.StatusSuccess, "text/gemini")
rw.Write([]byte(profile))
} else {
rw.WriteHeader(gmi.StatusClientCertificateRequired, "Certificate required")
}
}
func admin(rw *gmi.ResponseWriter, req *gmi.Request) {
if len(req.TLS.PeerCertificates) > 0 {
session, ok := getSession(req.TLS.PeerCertificates[0])
if !ok {
rw.WriteHeader(gmi.StatusCertificateNotAuthorised, "Certificate not authorized")
return
}
user := logins[session.username]
if !user.admin {
rw.WriteHeader(gmi.StatusCertificateNotAuthorised, "Admins only!")
return
}
rw.WriteHeader(gmi.StatusSuccess, "text/gemini")
rw.Write([]byte("Welcome to the admin portal.\n"))
} else {
rw.WriteHeader(gmi.StatusClientCertificateRequired, "Certificate required")
}
}
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