dbus: implement xdg-dbus-proxy wrapper

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

dbus/config.go

@@ -0,0 +1,59 @@
+package dbus
+
+type Config struct {
+	See  []string `json:"see"`
+	Talk []string `json:"talk"`
+	Own  []string `json:"own"`
+
+	Log    bool `json:"log,omitempty"`
+	Filter bool `json:"filter"`
+}
+
+func (c *Config) Args(address, path string) (args []string) {
+	argc := 2 + len(c.See) + len(c.Talk) + len(c.Own)
+	if c.Log {
+		argc++
+	}
+	if c.Filter {
+		argc++
+	}
+
+	args = make([]string, 0, argc)
+	args = append(args, address, path)
+	for _, name := range c.See {
+		args = append(args, "--see="+name)
+	}
+	for _, name := range c.Talk {
+		args = append(args, "--talk="+name)
+	}
+	for _, name := range c.Own {
+		args = append(args, "--own="+name)
+	}
+	if c.Log {
+		args = append(args, "--log")
+	}
+	if c.Filter {
+		args = append(args, "--filter")
+	}
+
+	return
+}
+
+// NewConfig returns a reference to a Config struct with optional defaults.
+// If id is an empty string own defaults are omitted.
+func NewConfig(id string, defaults, mpris bool) (c *Config) {
+	c = &Config{Filter: true}
+
+	if defaults {
+		c.Talk = []string{"org.freedesktop.DBus", "org.freedesktop.portal.*", "org.freedesktop.Notifications"}
+
+		if id != "" {
+			c.Own = []string{id}
+			if mpris {
+				c.Own = append(c.Own, "org.mpris.MediaPlayer2."+id)
+			}
+		}
+	}
+
+	return
+}