Config module

config/config.go

@@ -0,0 +1,47 @@
+package config
+
+import (
+	"encoding/json"
+	"flag"
+	"io/ioutil"
+	"os"
+)
+
+type (
+	Config struct {
+		ClientID     string `json:"github_client_id"`
+		ClientSecret string `json:"github_client_secret"`
+		RedirectURI  string `json:"github_redirect_uri"`
+	}
+)
+
+var (
+	conf Config
+)
+
+// Config is immutable and is always returned by value
+func C() Config {
+	return conf
+}
+
+func init() {
+	var (
+		path     string
+		fd       *os.File
+		contents []byte
+		err      error
+	)
+
+	flag.StringVar(&path, "config", "config.json", "Path to configuration file")
+	flag.Parse()
+
+	if fd, err = os.Open(path); err != nil {
+		panic(err)
+	}
+	if contents, err = ioutil.ReadAll(fd); err != nil {
+		panic(err)
+	}
+	if err = json.Unmarshal(contents, &conf); err != nil {
+		panic(err)
+	}
+}