config: Add browser parameter (#3807)

browser new parameter receives "on" or "off" parameter which is similar
to MINIO_BROWSER

cmd/globals.go

@@ -19,9 +19,7 @@ package cmd
 import (
 	"crypto/x509"
 	"net/url"
-	"os"
 	"runtime"
-	"strings"
 	"time"
 
 	humanize "github.com/dustin/go-humanize"
@@ -74,9 +72,12 @@ var (
 	// Indicates if the running minio server is an erasure-code backend.
 	globalIsXL = false
 
-	// This flag is set to 'true' by default, it is set to `false`
-	// when MINIO_BROWSER env is set to 'off'.
-	globalIsBrowserEnabled = !strings.EqualFold(os.Getenv("MINIO_BROWSER"), "off")
+	// This flag is set to 'true' by default
+	globalIsBrowserEnabled = true
+	// This flag is set to 'true' when MINIO_BROWSER env is set.
+	globalIsEnvBrowser = false
+	// Set to true if credentials were passed from env, default is false.
+	globalIsEnvCreds = false
 
 	// Maximum cache size. Defaults to disabled.
 	// Caching is enabled only for RAM size > 8GiB.
@@ -113,9 +114,6 @@ var (
 	// Minio server user agent string.
 	globalServerUserAgent = "Minio/" + ReleaseTag + " (" + runtime.GOOS + "; " + runtime.GOARCH + ")"
 
-	// Set to true if credentials were passed from env, default is false.
-	globalIsEnvCreds = false
-
 	// url.URL endpoints of disks that belong to the object storage.
 	globalEndpoints = []*url.URL{}