Provide Handler with client certificate information

client.go

@@ -15,21 +15,7 @@ var (
 )
 
 // Client is a Gemini client.
-// To use a client-side certificate, provide it here.
-//
-// Example:
-//
-//     config := tls.Config{}
-//     cert, err := tls.LoadX509KeyPair("client.crt", "client.key")
-//     if err != nil {
-//         panic(err)
-//     }
-//     config.Certificates = append(config.Certificates, cert)
-//
-type Client struct {
-	// The client's TLS configuration.
-	TLSConfig tls.Config
-}
+type Client struct{}
 
 // Request makes a request for the provided URL. The host is inferred from the URL.
 func (c *Client) Request(url string) (*Response, error) {
@@ -50,9 +36,20 @@ func (c *Client) ProxyRequest(host, url string) (*Response, error) {
 }
 
 // Request is a Gemini request.
+//
+// A Request can optionally be configured with a client certificate. Example:
+//
+//     req := NewRequest(url)
+//     cert, err := tls.LoadX509KeyPair("client.crt", "client.key")
+//     if err != nil {
+//         panic(err)
+//     }
+//     req.Certificates = append(req.Certificates, cert)
+//
 type Request struct {
-	Host string   // host or host:port
-	URL  *url.URL // The URL to request
+	Host         string            // host or host:port
+	URL          *url.URL          // the requested URL
+	Certificates []tls.Certificate // client certificates
 }
 
 // NewRequest returns a new request. The host is inferred from the provided url.
@@ -95,9 +92,10 @@ func (c *Client) Do(req *Request) (*Response, error) {
 		host += ":1965"
 	}
 
+	config := tls.Config{}
 	// Allow self signed certificates
-	config := c.TLSConfig
 	config.InsecureSkipVerify = true
+	config.Certificates = req.Certificates
 
 	conn, err := tls.Dial("tcp", host, &config)
 	if err != nil {

examples/client/client.go

@@ -13,6 +13,7 @@ import (
 )
 
 var client gemini.Client
+var cert tls.Certificate
 
 func init() {
 	// Configure a client side certificate.
@@ -22,17 +23,20 @@ func init() {
 	//     openssl ecparam -genkey -name secp384r1 -out client.key
 	//     openssl req -new -x509 -sha256 -key client.key -out client.crt -days 3650
 	//
-	config := tls.Config{}
-	cert, err := tls.LoadX509KeyPair("examples/client/client.crt", "examples/client/client.key")
+	var err error
+	cert, err = tls.LoadX509KeyPair("examples/client/client.crt", "examples/client/client.key")
 	if err != nil {
 		log.Fatal(err)
 	}
-	config.Certificates = append(config.Certificates, cert)
-	client.TLSConfig = config
 }
 
 func makeRequest(url string) {
-	resp, err := client.Request(url)
+	req, err := gemini.NewRequest(url)
+	if err != nil {
+		log.Fatal(err)
+	}
+	req.Certificates = append(req.Certificates, cert)
+	resp, err := client.Do(req)
 	if err != nil {
 		log.Fatal(err)
 	}

examples/server/server.go

@@ -4,9 +4,9 @@ package main
 
 import (
 	"crypto/tls"
-	"git.sr.ht/~adnano/go-gemini"
 	"log"
-	"net/url"
+
+	"git.sr.ht/~adnano/go-gemini"
 )
 
 func main() {
@@ -23,13 +23,15 @@ func main() {
 		log.Fatal(err)
 	}
 	config.Certificates = append(config.Certificates, cert)
+	config.ClientAuth = tls.RequestClientCert
 
 	mux := &gemini.Mux{}
-	mux.HandleFunc("/", func(url *url.URL) *gemini.Response {
+	mux.HandleFunc("/", func(req *gemini.RequestInfo) *gemini.Response {
+		log.Printf("Request for %s with certificates %v", req.URL.String(), req.Certificates)
 		return &gemini.Response{
 			Status: gemini.StatusSuccess,
 			Meta:   "text/gemini",
-			Body:   []byte("You requested " + url.String()),
+			Body:   []byte("You requested " + req.URL.String()),
 		}
 	})
 

server.go

@@ -2,6 +2,7 @@ package gemini
 
 import (
 	"crypto/tls"
+	"crypto/x509"
 	"io"
 	"net"
 	"net/url"
@@ -99,17 +100,29 @@ func (s *Server) Serve(ln net.Listener) error {
 		if err != nil {
 			continue
 		}
-		resp := s.Handler.Serve(url)
+
+		// Gather information about the request
+		certs := rw.(*tls.Conn).ConnectionState().PeerCertificates
+		reqInfo := &RequestInfo{
+			URL:          url,
+			Certificates: certs,
+		}
+		resp := s.Handler.Serve(reqInfo)
 		resp.Write(rw)
 		rw.Close()
 	}
 }
 
+// RequestInfo contains information about a request.
+type RequestInfo struct {
+	URL          *url.URL
+	Certificates []*x509.Certificate
+}
+
 // A Handler responds to a Gemini request.
 type Handler interface {
-	// Serve accepts a url, as that is the only information that is provided in
-	// a Gemini request.
-	Serve(*url.URL) *Response
+	// Serve accepts a Request and returns a Response.
+	Serve(*RequestInfo) *Response
 }
 
 // Mux is a Gemini request multiplexer.
@@ -153,26 +166,26 @@ func (m *Mux) Handle(pattern string, handler Handler) {
 }
 
 // HandleFunc registers a HandlerFunc for the given pattern.
-func (m *Mux) HandleFunc(pattern string, handlerFunc func(url *url.URL) *Response) {
+func (m *Mux) HandleFunc(pattern string, handlerFunc func(req *RequestInfo) *Response) {
 	handler := HandlerFunc(handlerFunc)
 	m.Handle(pattern, handler)
 }
 
 // Serve responds to the request with the appropriate handler.
-func (m *Mux) Serve(url *url.URL) *Response {
-	h := m.match(url)
+func (m *Mux) Serve(req *RequestInfo) *Response {
+	h := m.match(req.URL)
 	if h == nil {
 		return &Response{
 			Status: StatusNotFound,
 			Meta:   "Not found",
 		}
 	}
-	return h.Serve(url)
+	return h.Serve(req)
 }
 
 // A wrapper around a bare function that implements Handler.
-type HandlerFunc func(url *url.URL) *Response
+type HandlerFunc func(req *RequestInfo) *Response
 
-func (f HandlerFunc) Serve(url *url.URL) *Response {
-	return f(url)
+func (f HandlerFunc) Serve(req *RequestInfo) *Response {
+	return f(req)
 }