// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"fmt"
	"io/ioutil"
	"os"
	"testing"

	"github.com/minio/minio/internal/config"
)

// Test if config v1 is purged
func TestServerConfigMigrateV1(t *testing.T) {
	objLayer, fsDir, err := prepareFS()
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(fsDir)
	err = newTestConfig(globalMinioDefaultRegion, objLayer)
	if err != nil {
		t.Fatalf("Init Test config failed")
	}
	rootPath := t.TempDir()
	globalConfigDir = &ConfigDir{path: rootPath}

	globalObjLayerMutex.Lock()
	globalObjectAPI = objLayer
	globalObjLayerMutex.Unlock()

	// Create a V1 config json file and store it
	configJSON := "{ \"version\":\"1\", \"accessKeyId\":\"abcde\", \"secretAccessKey\":\"abcdefgh\"}"
	configPath := rootPath + "/fsUsers.json"
	if err := ioutil.WriteFile(configPath, []byte(configJSON), 0o644); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	// Fire a migrateConfig()
	if err := migrateConfig(); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	// Check if config v1 is removed from filesystem
	if _, err := os.Stat(configPath); err == nil || !osIsNotExist(err) {
		t.Fatal("Config V1 file is not purged")
	}

	// Initialize server config and check again if everything is fine
	if err := loadConfig(objLayer); err != nil {
		t.Fatalf("Unable to initialize from updated config file %s", err)
	}
}

// Test if all migrate code returns nil when config file does not
// exist
func TestServerConfigMigrateInexistentConfig(t *testing.T) {
	globalConfigDir = &ConfigDir{path: t.TempDir()}

	if err := migrateV2ToV3(); err != nil {
		t.Fatal("migrate v2 to v3 should succeed when no config file is found")
	}
	if err := migrateV3ToV4(); err != nil {
		t.Fatal("migrate v3 to v4 should succeed when no config file is found")
	}
	if err := migrateV4ToV5(); err != nil {
		t.Fatal("migrate v4 to v5 should succeed when no config file is found")
	}
	if err := migrateV5ToV6(); err != nil {
		t.Fatal("migrate v5 to v6 should succeed when no config file is found")
	}
	if err := migrateV6ToV7(); err != nil {
		t.Fatal("migrate v6 to v7 should succeed when no config file is found")
	}
	if err := migrateV7ToV8(); err != nil {
		t.Fatal("migrate v7 to v8 should succeed when no config file is found")
	}
	if err := migrateV8ToV9(); err != nil {
		t.Fatal("migrate v8 to v9 should succeed when no config file is found")
	}
	if err := migrateV9ToV10(); err != nil {
		t.Fatal("migrate v9 to v10 should succeed when no config file is found")
	}
	if err := migrateV10ToV11(); err != nil {
		t.Fatal("migrate v10 to v11 should succeed when no config file is found")
	}
	if err := migrateV11ToV12(); err != nil {
		t.Fatal("migrate v11 to v12 should succeed when no config file is found")
	}
	if err := migrateV12ToV13(); err != nil {
		t.Fatal("migrate v12 to v13 should succeed when no config file is found")
	}
	if err := migrateV13ToV14(); err != nil {
		t.Fatal("migrate v13 to v14 should succeed when no config file is found")
	}
	if err := migrateV14ToV15(); err != nil {
		t.Fatal("migrate v14 to v15 should succeed when no config file is found")
	}
	if err := migrateV15ToV16(); err != nil {
		t.Fatal("migrate v15 to v16 should succeed when no config file is found")
	}
	if err := migrateV16ToV17(); err != nil {
		t.Fatal("migrate v16 to v17 should succeed when no config file is found")
	}
	if err := migrateV17ToV18(); err != nil {
		t.Fatal("migrate v17 to v18 should succeed when no config file is found")
	}
	if err := migrateV18ToV19(); err != nil {
		t.Fatal("migrate v18 to v19 should succeed when no config file is found")
	}
	if err := migrateV19ToV20(); err != nil {
		t.Fatal("migrate v19 to v20 should succeed when no config file is found")
	}
	if err := migrateV20ToV21(); err != nil {
		t.Fatal("migrate v20 to v21 should succeed when no config file is found")
	}
	if err := migrateV21ToV22(); err != nil {
		t.Fatal("migrate v21 to v22 should succeed when no config file is found")
	}
	if err := migrateV22ToV23(); err != nil {
		t.Fatal("migrate v22 to v23 should succeed when no config file is found")
	}
	if err := migrateV23ToV24(); err != nil {
		t.Fatal("migrate v23 to v24 should succeed when no config file is found")
	}
	if err := migrateV24ToV25(); err != nil {
		t.Fatal("migrate v24 to v25 should succeed when no config file is found")
	}
	if err := migrateV25ToV26(); err != nil {
		t.Fatal("migrate v25 to v26 should succeed when no config file is found")
	}
	if err := migrateV26ToV27(); err != nil {
		t.Fatal("migrate v26 to v27 should succeed when no config file is found")
	}
	if err := migrateV27ToV28(); err != nil {
		t.Fatal("migrate v27 to v28 should succeed when no config file is found")
	}
}

// Test if a config migration from v2 to v33 is successfully done
func TestServerConfigMigrateV2toV33(t *testing.T) {
	rootPath := t.TempDir()

	globalConfigDir = &ConfigDir{path: rootPath}

	objLayer, fsDir, err := prepareFS()
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(fsDir)

	configPath := rootPath + SlashSeparator + minioConfigFile

	// Create a corrupted config file
	if err := ioutil.WriteFile(configPath, []byte("{ \"version\":\"2\","), 0o644); err != nil {
		t.Fatal("Unexpected error: ", err)
	}
	// Fire a migrateConfig()
	if err := migrateConfig(); err == nil {
		t.Fatal("migration should fail with corrupted config file")
	}

	accessKey := "accessfoo"
	secretKey := "secretfoo"

	// Create a V2 config json file and store it
	configJSON := "{ \"version\":\"2\", \"credentials\": {\"accessKeyId\":\"" + accessKey + "\", \"secretAccessKey\":\"" + secretKey + "\", \"region\":\"us-east-1\"}, \"mongoLogger\":{\"addr\":\"127.0.0.1:3543\", \"db\":\"foodb\", \"collection\":\"foo\"}, \"syslogLogger\":{\"network\":\"127.0.0.1:543\", \"addr\":\"addr\"}, \"fileLogger\":{\"filename\":\"log.out\"}}"
	if err := ioutil.WriteFile(configPath, []byte(configJSON), 0o644); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	// Fire a migrateConfig()
	if err := migrateConfig(); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	if err := migrateConfigToMinioSys(objLayer); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	if err := migrateMinioSysConfig(objLayer); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	if err := migrateMinioSysConfigToKV(objLayer); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	// Initialize server config and check again if everything is fine
	if err := loadConfig(objLayer); err != nil {
		t.Fatalf("Unable to initialize from updated config file %s", err)
	}

	// Check if accessKey and secretKey are not altered during migration
	caccessKey := globalServerConfig[config.CredentialsSubSys][config.Default].Get(config.AccessKey)
	if caccessKey != accessKey {
		t.Fatalf("Access key lost during migration, expected: %v, found:%v", accessKey, caccessKey)
	}

	csecretKey := globalServerConfig[config.CredentialsSubSys][config.Default].Get(config.SecretKey)
	if csecretKey != secretKey {
		t.Fatalf("Secret key lost during migration, expected: %v, found: %v", secretKey, csecretKey)
	}
}

// Test if all migrate code returns error with corrupted config files
func TestServerConfigMigrateFaultyConfig(t *testing.T) {
	rootPath := t.TempDir()

	globalConfigDir = &ConfigDir{path: rootPath}
	configPath := rootPath + SlashSeparator + minioConfigFile

	// Create a corrupted config file
	if err := ioutil.WriteFile(configPath, []byte("{ \"version\":\"2\", \"test\":"), 0o644); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	// Test different migrate versions and be sure they are returning an error
	if err := migrateV2ToV3(); err == nil {
		t.Fatal("migrateConfigV2ToV3() should fail with a corrupted json")
	}
	if err := migrateV3ToV4(); err == nil {
		t.Fatal("migrateConfigV3ToV4() should fail with a corrupted json")
	}
	if err := migrateV4ToV5(); err == nil {
		t.Fatal("migrateConfigV4ToV5() should fail with a corrupted json")
	}
	if err := migrateV5ToV6(); err == nil {
		t.Fatal("migrateConfigV5ToV6() should fail with a corrupted json")
	}
	if err := migrateV6ToV7(); err == nil {
		t.Fatal("migrateConfigV6ToV7() should fail with a corrupted json")
	}
	if err := migrateV7ToV8(); err == nil {
		t.Fatal("migrateConfigV7ToV8() should fail with a corrupted json")
	}
	if err := migrateV8ToV9(); err == nil {
		t.Fatal("migrateConfigV8ToV9() should fail with a corrupted json")
	}
	if err := migrateV9ToV10(); err == nil {
		t.Fatal("migrateConfigV9ToV10() should fail with a corrupted json")
	}
	if err := migrateV10ToV11(); err == nil {
		t.Fatal("migrateConfigV10ToV11() should fail with a corrupted json")
	}
	if err := migrateV11ToV12(); err == nil {
		t.Fatal("migrateConfigV11ToV12() should fail with a corrupted json")
	}
	if err := migrateV12ToV13(); err == nil {
		t.Fatal("migrateConfigV12ToV13() should fail with a corrupted json")
	}
	if err := migrateV13ToV14(); err == nil {
		t.Fatal("migrateConfigV13ToV14() should fail with a corrupted json")
	}
	if err := migrateV14ToV15(); err == nil {
		t.Fatal("migrateConfigV14ToV15() should fail with a corrupted json")
	}
	if err := migrateV15ToV16(); err == nil {
		t.Fatal("migrateConfigV15ToV16() should fail with a corrupted json")
	}
	if err := migrateV16ToV17(); err == nil {
		t.Fatal("migrateConfigV16ToV17() should fail with a corrupted json")
	}
	if err := migrateV17ToV18(); err == nil {
		t.Fatal("migrateConfigV17ToV18() should fail with a corrupted json")
	}
	if err := migrateV18ToV19(); err == nil {
		t.Fatal("migrateConfigV18ToV19() should fail with a corrupted json")
	}
	if err := migrateV19ToV20(); err == nil {
		t.Fatal("migrateConfigV19ToV20() should fail with a corrupted json")
	}
	if err := migrateV20ToV21(); err == nil {
		t.Fatal("migrateConfigV20ToV21() should fail with a corrupted json")
	}
	if err := migrateV21ToV22(); err == nil {
		t.Fatal("migrateConfigV21ToV22() should fail with a corrupted json")
	}
	if err := migrateV22ToV23(); err == nil {
		t.Fatal("migrateConfigV22ToV23() should fail with a corrupted json")
	}
	if err := migrateV23ToV24(); err == nil {
		t.Fatal("migrateConfigV23ToV24() should fail with a corrupted json")
	}
	if err := migrateV24ToV25(); err == nil {
		t.Fatal("migrateConfigV24ToV25() should fail with a corrupted json")
	}
	if err := migrateV25ToV26(); err == nil {
		t.Fatal("migrateConfigV25ToV26() should fail with a corrupted json")
	}
	if err := migrateV26ToV27(); err == nil {
		t.Fatal("migrateConfigV26ToV27() should fail with a corrupted json")
	}
	if err := migrateV27ToV28(); err == nil {
		t.Fatal("migrateConfigV27ToV28() should fail with a corrupted json")
	}
}

// Test if all migrate code returns error with corrupted config files
func TestServerConfigMigrateCorruptedConfig(t *testing.T) {
	rootPath := t.TempDir()

	globalConfigDir = &ConfigDir{path: rootPath}
	configPath := rootPath + SlashSeparator + minioConfigFile

	for i := 3; i <= 17; i++ {
		// Create a corrupted config file
		if err := ioutil.WriteFile(configPath, []byte(fmt.Sprintf("{ \"version\":\"%d\", \"credential\": { \"accessKey\": 1 } }", i)),
			0o644); err != nil {
			t.Fatal("Unexpected error: ", err)
		}

		// Test different migrate versions and be sure they are returning an error
		if err := migrateConfig(); err == nil {
			t.Fatal("migrateConfig() should fail with a corrupted json")
		}
	}

	// Create a corrupted config file for version '2'.
	if err := ioutil.WriteFile(configPath, []byte("{ \"version\":\"2\", \"credentials\": { \"accessKeyId\": 1 } }"), 0o644); err != nil {
		t.Fatal("Unexpected error: ", err)
	}

	// Test different migrate versions and be sure they are returning an error
	if err := migrateConfig(); err == nil {
		t.Fatal("migrateConfig() should fail with a corrupted json")
	}
}