Use snowflake's safe logger.

The http package can log error messages that include the client's IP
address.  We don't want any IP addresses in our log file and snowflake's
safe logger can scrub them.

main.go

@@ -2,10 +2,13 @@ package main
 
 import (
 	"flag"
+	"io"
 	"log"
 	"net/http"
+	"os"
 	"time"
 
+	"git.torproject.org/pluggable-transports/snowflake.git/common/safelog"
 	"github.com/gorilla/mux"
 )
 
@@ -82,6 +85,11 @@ func main() {
 	flag.StringVar(&keyFile, "key-file", "", "Path to the certificate's private key, in .pem format.")
 	flag.Parse()
 
+	var logOutput io.Writer = os.Stderr
+	// We want to send the log output through our scrubber first
+	log.SetOutput(&safelog.LogScrubber{Output: logOutput})
+	log.SetFlags(log.LstdFlags | log.LUTC)
+
 	if certFile == "" {
 		log.Fatalf("The -cert-file argument is required.")
 	}