gopher support.

Some of the contrib packages were originally built gemini-specific and
had to be refactored into generic core functionality and thin
protocol-specific wrappers for each of gemini and gopher.

1 files changed, 72 insertions, 0 deletions

diff --git a/gopher/serve.go b/gopher/serve.go
new file mode 100644
index 0000000..84745d7
--- /dev/null
+++ b/gopher/serve.go
@@ -0,0 +1,72 @@
+package gopher
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"strings"
+
+	"tildegit.org/tjp/gus"
+	"tildegit.org/tjp/gus/internal"
+	"tildegit.org/tjp/gus/logging"
+)
+
+type gopherServer struct {
+	internal.Server
+	handler gus.Handler
+}
+
+func (gs gopherServer) Protocol() string { return "GOPHER" }
+
+// NewServer builds a gopher server.
+func NewServer(
+	ctx context.Context,
+	hostname string,
+	network string,
+	address string,
+	handler gus.Handler,
+	errLog logging.Logger,
+) (gus.Server, error) {
+	gs := &gopherServer{handler: handler}
+
+	if strings.IndexByte(hostname, ':') < 0 {
+		hostname = net.JoinHostPort(hostname, "70")
+	}
+
+	var err error
+	gs.Server, err = internal.NewServer(ctx, hostname, network, address, errLog, gs.handleConn)
+	if err != nil {
+		return nil, err
+	}
+
+	return gs, nil
+}
+
+func (gs *gopherServer) handleConn(conn net.Conn) {
+	var response *gus.Response
+	request, err := ParseRequest(conn)
+	if err != nil {
+		response = Error(errors.New("Malformed request.")).Response()
+	} else {
+		request.Server = gs
+		request.RemoteAddr = conn.RemoteAddr()
+
+		defer func() {
+			if r := recover(); r != nil {
+				err := fmt.Errorf("%s", r)
+				_ = gs.LogError("msg", "panic in handler", "err", err)
+				rdr := NewResponseReader(Error(errors.New("Server error.")).Response())
+				_, _ = io.Copy(conn, rdr)
+			}
+		}()
+		response = gs.handler(gs.Ctx, request)
+		if response == nil {
+			response = Error(errors.New("Resource does not exist.")).Response()
+		}
+	}
+
+	defer response.Close()
+	_, _ = io.Copy(conn, NewResponseReader(response))
+}