Add persistent logging: syslog for unix, file for windows (#6)

persistentlog/windows.go

@@ -0,0 +1,28 @@
+// +build windows
+
+package persistentlog
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/rifflock/lfshook"
+	log "github.com/sirupsen/logrus"
+)
+
+// AddPersistentLogHook configures persisting logs in a file
+func AddPersistentLogHook() {
+	appDataPath := os.Getenv("LOCALAPPDATA")
+	if appDataPath == "" {
+		log.Warn("Unable to determine %%APPDATA%% folder location, logs will NOT be persisted")
+		return
+	}
+	logFolderPath := filepath.Join(appDataPath, "browserpass")
+	if err := os.MkdirAll(logFolderPath, os.ModePerm); err != nil {
+		log.Warn("Unable to create browserpass folder in %%APPDATA%%, logs will NOT be persisted")
+		return
+	}
+	logFilePath := filepath.Join(logFolderPath, "browserpass.log")
+	log.Debug("Logs will being written to: ", logFilePath)
+	log.AddHook(lfshook.NewHook(logFilePath, &log.TextFormatter{FullTimestamp: true}))
+}