func NewMongoStore(DBCollection *mgo.Collection, keyPairs ...[]byte) *MongoStore { index := mgo.Index{Unique: true, Key: []string{"sessionid"}} DBCollection.EnsureIndex(index) return &MongoStore{ Codecs: securecookie.CodecsFromPairs(keyPairs...), Options: &sessions.Options{ Path: "/", MaxAge: 86400 * 30, }, DBCollection: DBCollection, } }