Multiplex http and ssh ports

internal/config/ports.go

@@ -0,0 +1,33 @@
+package config
+
+import (
+	"fmt"
+
+	"golang.org/x/exp/slices"
+)
+
+type ListenConfig struct {
+	// Ports are the public addresses to bind to.
+	// Each address is automatically multiplexed to serve http, https and ssh traffic.
+	// This should typically be port 80 and port 443.
+	Ports []uint16 `yaml:"ports" default:"80" validate:"ports"`
+
+	// AdvertisedSSHPort is the port that shows up as the ssh port in various places in the interface.
+	// It is automaticalled added to the ports to listen to.
+	AdvertisedSSHPort uint16 `yaml:"advertise_ssh" default:"80" validate:"port"`
+}
+
+// ComposePorts returns a list of ports to be used within a docker-compose.yml file.
+// These can be used to forward all ports to the internal port.
+func (lc ListenConfig) ComposePorts(internal string) []string {
+	// sort and uniquify ports
+	ports := append([]uint16{lc.AdvertisedSSHPort}, lc.Ports...)
+	slices.Sort(ports)
+	ports = slices.Compact(ports)
+
+	forwards := make([]string, len(ports))
+	for i, port := range ports {
+		forwards[i] = fmt.Sprintf("%d:%s", port, internal)
+	}
+	return forwards
+}