Move configuration of logger to separate file

pkg/validation/logging.go

@@ -0,0 +1,65 @@
+package validation
+
+import (
+	"os"
+	"strings"
+
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/apis/options"
+	"github.com/oauth2-proxy/oauth2-proxy/pkg/logger"
+	"gopkg.in/natefinch/lumberjack.v2"
+)
+
+// configureLogger is responsible for configuring the logger based on the options given
+func configureLogger(o options.Logging, pingPath string, msgs []string) []string {
+	// Setup the log file
+	if len(o.File.Filename) > 0 {
+		// Validate that the file/dir can be written
+		file, err := os.OpenFile(o.File.Filename, os.O_WRONLY|os.O_CREATE, 0666)
+		if err != nil {
+			if os.IsPermission(err) {
+				return append(msgs, "unable to write to log file: "+o.File.Filename)
+			}
+		}
+		file.Close()
+
+		logger.Printf("Redirecting logging to file: %s", o.File.Filename)
+
+		logWriter := &lumberjack.Logger{
+			Filename:   o.File.Filename,
+			MaxSize:    o.File.MaxSize, // megabytes
+			MaxAge:     o.File.MaxAge,  // days
+			MaxBackups: o.File.MaxBackups,
+			LocalTime:  o.LocalTime,
+			Compress:   o.File.Compress,
+		}
+
+		logger.SetOutput(logWriter)
+	}
+
+	// Supply a sanity warning to the logger if all logging is disabled
+	if !o.StandardEnabled && !o.AuthEnabled && !o.RequestEnabled {
+		logger.Print("Warning: Logging disabled. No further logs will be shown.")
+	}
+
+	// Pass configuration values to the standard logger
+	logger.SetStandardEnabled(o.StandardEnabled)
+	logger.SetAuthEnabled(o.AuthEnabled)
+	logger.SetReqEnabled(o.RequestEnabled)
+	logger.SetStandardTemplate(o.StandardFormat)
+	logger.SetAuthTemplate(o.AuthFormat)
+	logger.SetReqTemplate(o.RequestFormat)
+
+	excludePaths := make([]string, 0)
+	excludePaths = append(excludePaths, strings.Split(o.ExcludePaths, ",")...)
+	if o.SilencePing {
+		excludePaths = append(excludePaths, pingPath)
+	}
+
+	logger.SetExcludePaths(excludePaths)
+
+	if !o.LocalTime {
+		logger.SetFlags(logger.Flags() | logger.LUTC)
+	}
+
+	return msgs
+}