add comments to expiration config

Author: dmcinnes

manage/config.go

@@ -4,19 +4,19 @@ import "time"
 
 // Config authorization configuration parameters
 type Config struct {
-	// access token expiration time
+	// access token expiration time, 0 means it doesn't expire
 	AccessTokenExp time.Duration
-	// refresh token expiration time
+	// refresh token expiration time, 0 means it doesn't expire
 	RefreshTokenExp time.Duration
 	// whether to generate the refreshing token
 	IsGenerateRefresh bool
 }
 
 // RefreshingConfig refreshing token config
 type RefreshingConfig struct {
-	// access token expiration time
+	// access token expiration time, 0 means it doesn't expire
 	AccessTokenExp time.Duration
-	// refresh token expiration time
+	// refresh token expiration time, 0 means it doesn't expire
 	RefreshTokenExp time.Duration
 	// whether to generate the refreshing token
 	IsGenerateRefresh bool