finger protocol

1 files changed, 68 insertions, 0 deletions

diff --git a/finger/serve.go b/finger/serve.go
new file mode 100644
index 0000000..8623de5
--- /dev/null
+++ b/finger/serve.go
@@ -0,0 +1,68 @@
+package finger
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"strings"
+
+	"tildegit.org/tjp/gus"
+	"tildegit.org/tjp/gus/internal"
+	"tildegit.org/tjp/gus/logging"
+)
+
+type fingerServer struct {
+	internal.Server
+	handler gus.Handler
+}
+
+func (fs fingerServer) Protocol() string { return "FINGER" }
+
+// NewServer builds a finger server.
+func NewServer(
+	ctx context.Context,
+	hostname string,
+	network string,
+	address string,
+	handler gus.Handler,
+	errLog logging.Logger,
+) (gus.Server, error) {
+	fs := &fingerServer{handler: handler}
+
+	if strings.IndexByte(hostname, ':') < 0 {
+		hostname = net.JoinHostPort(hostname, "79")
+	}
+
+	var err error
+	fs.Server, err = internal.NewServer(ctx, hostname, network, address, errLog, fs.handleConn)
+	if err != nil {
+		return nil, err
+	}
+
+	return fs, nil
+}
+
+func (fs *fingerServer) handleConn(conn net.Conn) {
+	request, err := ParseRequest(conn)
+	if err != nil {
+		_, _ = fmt.Fprint(conn, err.Error()+"\r\n")
+	}
+
+	request.Server = fs
+	request.RemoteAddr = conn.RemoteAddr()
+
+	defer func() {
+		if r := recover(); r != nil {
+			_ = fs.LogError("msg", "panic in handler", "err", r)
+			_, _ = fmt.Fprint(conn, "Error handling request.\r\n")
+		}
+	}()
+	response := fs.handler(fs.Ctx, request)
+	if response == nil {
+		response = Error("No result found.")
+	}
+
+	defer response.Close()
+	_, _ = io.Copy(conn, response.Body)
+}