1 files changed, 52 insertions, 0 deletions
diff --git a/config/config.go b/config/config.go
new file mode 100644
index 0000000..599f12c
--- /dev/null
+++ b/config/config.go
@@ -0,0 +1,52 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"github.com/BurntSushi/toml"
+	"net/url"
+	"os"
+)
+
+type Config struct {
+	Servers []struct {
+		Name   string `toml:"name"`
+		Prefix string `toml:"prefix"`
+		Proxy  string `toml:"proxy"`
+	} `toml:"servers"`
+	Debug  bool   `toml:"debug"`
+	Listen string `toml:"listen"`
+}
+
+func (c Config) Validate() error {
+	if len(c.Servers) == 0 {
+		return errors.New("no yggdrasil server specified")
+	}
+	for _, s := range c.Servers {
+		if s.Prefix == "" {
+			return fmt.Errorf("missing prefix for yggdrasil server `%v`", s.Name)
+		}
+		_, err := url.Parse(s.Prefix)
+		if err != nil {
+			return fmt.Errorf("invalid prefix for yggdrasil server `%v`: %w", s.Name, err)
+		}
+	}
+	return nil
+}
+
+func Read(path string) (*Config, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return nil, fmt.Errorf("open: %w", err)
+	}
+	defer func() {
+		_ = f.Close()
+	}()
+	dec := toml.NewDecoder(f)
+	var c Config
+	_, err = dec.Decode(&c)
+	if err != nil {
+		return nil, fmt.Errorf("decode: %w", err)
+	}
+	return &c, nil
+}