config: Relax browser and region to be empty. (#3912)

- If browser field is missing or empty
  then default to "on".

- If region field is empty or missing then
  default to "us-east-1" (S3 spec behavior)

cmd/config-v14.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"errors"
+	"fmt"
 	"io/ioutil"
 	"os"
 	"strings"
@@ -244,12 +245,12 @@ func validateConfig() error {
 
 	// Validate region field
 	if srvCfg.GetRegion() == "" {
-		return errors.New("region config is empty")
+		return errors.New("Region config value cannot be empty")
 	}
 
 	// Validate browser field
 	if b := strings.ToLower(srvCfg.GetBrowser()); b != "on" && b != "off" {
-		return errors.New("invalid browser config")
+		return fmt.Errorf("Browser config value %s is invalid", b)
 	}
 
 	// Validate credential field
@@ -286,6 +287,10 @@ func (s *serverConfigV14) SetRegion(region string) {
 	serverConfigMu.Lock()
 	defer serverConfigMu.Unlock()
 
+	// Empty region means "us-east-1" by default from S3 spec.
+	if region == "" {
+		region = "us-east-1"
+	}
 	s.Region = region
 }
 
@@ -294,7 +299,12 @@ func (s serverConfigV14) GetRegion() string {
 	serverConfigMu.RLock()
 	defer serverConfigMu.RUnlock()
 
-	return s.Region
+	if s.Region != "" {
+		return s.Region
+	} // region empty
+
+	// Empty region means "us-east-1" by default from S3 spec.
+	return "us-east-1"
 }
 
 // SetCredentials set new credentials.
@@ -320,6 +330,11 @@ func (s *serverConfigV14) SetBrowser(v string) {
 	defer serverConfigMu.Unlock()
 
 	// Set browser param
+	if v == "" {
+		v = "on" // Browser is on by default.
+	}
+
+	// Set the new value.
 	s.Browser = v
 }
 
@@ -328,7 +343,12 @@ func (s serverConfigV14) GetBrowser() string {
 	serverConfigMu.RLock()
 	defer serverConfigMu.RUnlock()
 
-	return s.Browser
+	if s.Browser != "" {
+		return s.Browser
+	} // empty browser.
+
+	// Empty browser means "on" by default.
+	return "on"
 }
 
 // Save config.

cmd/config-v14_test.go

@@ -200,11 +200,13 @@ func TestCheckDupJSONKeys(t *testing.T) {
 
 }
 
+// Tests config validator..
 func TestValidateConfig(t *testing.T) {
 	rootPath, err := newTestConfig(globalMinioDefaultRegion)
 	if err != nil {
 		t.Fatalf("Init Test config failed")
 	}
+
 	// remove the root directory after the test ends.
 	defer removeAll(rootPath)
 
@@ -234,52 +236,55 @@ func TestValidateConfig(t *testing.T) {
 		// Test 6 - missing secret key
 		{`{"version": "` + v + `", "browser": "on", "credential" : {"accessKey":"minio", "secretKey":""}}`, false},
 
-		// Test 7 - missing region
-		{`{"version": "` + v + `", "browser": "on", "credential" : {"accessKey":"minio", "secretKey":"minio123"}}`, false},
+		// Test 7 - missing region should pass, defaults to 'us-east-1'.
+		{`{"version": "` + v + `", "browser": "on", "credential" : {"accessKey":"minio", "secretKey":"minio123"}}`, true},
 
-		// Test 8 - success
+		// Test 8 - missing browser should pass, defaults to 'on'.
+		{`{"version": "` + v + `", "region": "us-east-1", "credential" : {"accessKey":"minio", "secretKey":"minio123"}}`, true},
+
+		// Test 9 - success
 		{`{"version": "` + v + `", "browser": "on", "region":"us-east-1", "credential" : {"accessKey":"minio", "secretKey":"minio123"}}`, true},
 
-		// Test 9 - duplicated json keys
+		// Test 10 - duplicated json keys
 		{`{"version": "` + v + `", "browser": "on", "browser": "on", "region":"us-east-1", "credential" : {"accessKey":"minio", "secretKey":"minio123"}}`, false},
 
-		// Test 10 - Wrong Console logger level
+		// Test 11 - Wrong Console logger level
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "logger": { "console": { "enable": true, "level": "foo" } }}`, false},
 
-		// Test 11 - Wrong File logger level
+		// Test 12 - Wrong File logger level
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "logger": { "file": { "enable": true, "level": "foo" } }}`, false},
 
-		// Test 12 - Test AMQP
+		// Test 13 - Test AMQP
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "amqp": { "1": { "enable": true, "url": "", "exchange": "", "routingKey": "", "exchangeType": "", "mandatory": false, "immediate": false, "durable": false, "internal": false, "noWait": false, "autoDeleted": false }}}}`, false},
 
-		// Test 13 - Test NATS
+		// Test 14 - Test NATS
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "nats": { "1": { "enable": true, "address": "", "subject": "", "username": "", "password": "", "token": "", "secure": false, "pingInterval": 0, "streaming": { "enable": false, "clusterID": "", "clientID": "", "async": false, "maxPubAcksInflight": 0 } } }}}`, false},
 
-		// Test 14 - Test ElasticSearch
+		// Test 15 - Test ElasticSearch
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "elasticsearch": { "1": { "enable": true, "url": "", "index": "" } }}}`, false},
 
-		// Test 15 - Test Redis
+		// Test 16 - Test Redis
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "redis": { "1": { "enable": true, "address": "", "password": "", "key": "" } }}}`, false},
 
-		// Test 16 - Test PostgreSQL
+		// Test 17 - Test PostgreSQL
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "postgresql": { "1": { "enable": true, "connectionString": "", "table": "", "host": "", "port": "", "user": "", "password": "", "database": "" }}}}`, false},
 
-		// Test 17 - Test Kafka
+		// Test 18 - Test Kafka
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "kafka": { "1": { "enable": true, "brokers": null, "topic": "" } }}}`, false},
 
-		// Test 18 - Test Webhook
+		// Test 19 - Test Webhook
 		{`{"version": "` + v + `", "credential": { "accessKey": "minio", "secretKey": "minio123" }, "region": "us-east-1", "browser": "on", "notify": { "webhook": { "1": { "enable": true, "endpoint": "" } }}}`, false},
 	}
 
 	for i, testCase := range testCases {
-		if err := ioutil.WriteFile(configPath, []byte(testCase.configData), 0700); err != nil {
-			t.Error(err)
+		if werr := ioutil.WriteFile(configPath, []byte(testCase.configData), 0700); werr != nil {
+			t.Fatal(werr)
 		}
-		err := validateConfig()
-		if testCase.shouldPass && err != nil {
-			t.Errorf("Test %d, should pass but it failed with err = %v", i+1, err)
+		verr := validateConfig()
+		if testCase.shouldPass && verr != nil {
+			t.Errorf("Test %d, should pass but it failed with err = %v", i+1, verr)
 		}
-		if !testCase.shouldPass && err == nil {
+		if !testCase.shouldPass && verr == nil {
 			t.Errorf("Test %d, should fail but it succeed.", i+1)
 		}
 	}

cmd/server-main.go

@@ -128,7 +128,7 @@ func initConfig() {
 			console.Fatalf("Invalid access/secret Key set in environment. Err: %s.\n", err)
 		}
 
-		// Envs are set globally.
+		// credential Envs are set globally.
 		globalIsEnvCreds = true
 	}
 
@@ -138,7 +138,9 @@ func initConfig() {
 			console.Fatalf("Invalid value ‘%s’ in MINIO_BROWSER environment variable.", browser)
 		}
 
-		globalIsEnvBrowser = strings.EqualFold(browser, "off")
+		// browser Envs are set globally, this doesn't represent
+		// if browser is turned off or on.
+		globalIsEnvBrowser = true
 	}
 
 	envs := envParams{