implement auth middleware

config/config.go

@@ -76,13 +76,16 @@ type Config struct {
 		// If set to <= 0 logs are kept forever
 		DeleteAfterDays int `mapstructure:"deleteAfterDays"`
 	} `mapstructure:"log"`
+
+	AuthKeys []string `mapstructure:"authKeys"`
 }
 
 var config *Config
 
-func LoadConfiguration(path *string) error {
-	if path != nil {
-		viper.SetConfigFile(*path)
+// LoadConfiguration loads the configuration from a specified file
+func LoadConfiguration(path string) error {
+	if path != "" {
+		viper.SetConfigFile(path)
 	} else {
 		viper.AddConfigPath("./")
 		viper.SetConfigName("config")
@@ -109,3 +112,13 @@ func Get() *Config {
 func setDefaults() {
 
 }
+
+// ContainsAuthKey checks wether the config contains a specified authentication key
+func (c *Config) ContainsAuthKey(key string) bool {
+	for _, k := range c.AuthKeys {
+		if k == key {
+			return true
+		}
+	}
+	return false
+}

config/config_test.go

@@ -6,10 +6,22 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-var configFile = "../config.example.json"
+const configFile = "../config.example.json"
 
 func TestLoadConfiguraiton(t *testing.T) {
-	err := LoadConfiguration(&configFile)
+	err := LoadConfiguration(configFile)
 	assert.Nil(t, err)
 	assert.Equal(t, Get().Web.ListenHost, "0.0.0.0")
 }
+
+func TestContainsAuthKey(t *testing.T) {
+	t.Run("key exists", func(t *testing.T) {
+		LoadConfiguration(configFile)
+		assert.True(t, Get().ContainsAuthKey("somekey"))
+	})
+
+	t.Run("key doesn't exist", func(t *testing.T) {
+		LoadConfiguration(configFile)
+		assert.False(t, Get().ContainsAuthKey("someotherkey"))
+	})
+}