Use json format for app and session repo

model/app.go

@@ -2,7 +2,6 @@ package model
 
 import (
 	"errors"
-	"strings"
 )
 
 var (
@@ -10,31 +9,13 @@ var (
 )
 
 type App struct {
-	InstanceDomain string
-	InstanceURL    string
-	ClientID       string
-	ClientSecret   string
+	InstanceDomain string `json:"instance_domain"`
+	InstanceURL    string `json:"instance_url"`
+	ClientID       string `json:"client_id"`
+	ClientSecret   string `json:"client_secret"`
 }
 
 type AppRepository interface {
 	Add(app App) (err error)
 	Get(instanceDomain string) (app App, err error)
 }
-
-func (a *App) Marshal() []byte {
-	str := a.InstanceURL + "\n" + a.ClientID + "\n" + a.ClientSecret
-	return []byte(str)
-}
-
-func (a *App) Unmarshal(instanceDomain string, data []byte) error {
-	str := string(data)
-	lines := strings.Split(str, "\n")
-	if len(lines) != 3 {
-		return errors.New("invalid data")
-	}
-	a.InstanceDomain = instanceDomain
-	a.InstanceURL = lines[0]
-	a.ClientID = lines[1]
-	a.ClientSecret = lines[2]
-	return nil
-}