// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2017 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package setting

import (
	"encoding/base64"
	"fmt"
	"io"
	"io/ioutil"
	"math"
	"net"
	"net/url"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
	"time"

	"code.gitea.io/gitea/modules/generate"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/user"
	"code.gitea.io/gitea/modules/util"

	shellquote "github.com/kballard/go-shellquote"
	"github.com/unknwon/com"
	gossh "golang.org/x/crypto/ssh"
	ini "gopkg.in/ini.v1"
)

// Scheme describes protocol types
type Scheme string

// enumerates all the scheme types
const (
	HTTP       Scheme = "http"
	HTTPS      Scheme = "https"
	FCGI       Scheme = "fcgi"
	FCGIUnix   Scheme = "fcgi+unix"
	UnixSocket Scheme = "unix"
)

// LandingPage describes the default page
type LandingPage string

// enumerates all the landing page types
const (
	LandingPageHome          LandingPage = "/"
	LandingPageExplore       LandingPage = "/explore"
	LandingPageOrganizations LandingPage = "/explore/organizations"
	LandingPageLogin         LandingPage = "/user/login"
)

// enumerates all the types of captchas
const (
	ImageCaptcha = "image"
	ReCaptcha    = "recaptcha"
	HCaptcha     = "hcaptcha"
)

// settings
var (
	// AppVer settings
	AppVer         string
	AppBuiltWith   string
	AppStartTime   time.Time
	AppName        string
	AppURL         string
	AppSubURL      string
	AppSubURLDepth int // Number of slashes
	AppPath        string
	AppDataPath    string
	AppWorkPath    string

	// Server settings
	Protocol             Scheme
	Domain               string
	HTTPAddr             string
	HTTPPort             string
	LocalURL             string
	RedirectOtherPort    bool
	PortToRedirect       string
	OfflineMode          bool
	CertFile             string
	KeyFile              string
	StaticRootPath       string
	StaticCacheTime      time.Duration
	EnableGzip           bool
	LandingPageURL       LandingPage
	UnixSocketPermission uint32
	EnablePprof          bool
	PprofDataPath        string
	EnableLetsEncrypt    bool
	LetsEncryptTOS       bool
	LetsEncryptDirectory string
	LetsEncryptEmail     string
	GracefulRestartable  bool
	GracefulHammerTime   time.Duration
	StartupTimeout       time.Duration
	StaticURLPrefix      string

	SSH = struct {
		Disabled                       bool              `ini:"DISABLE_SSH"`
		StartBuiltinServer             bool              `ini:"START_SSH_SERVER"`
		BuiltinServerUser              string            `ini:"BUILTIN_SSH_SERVER_USER"`
		Domain                         string            `ini:"SSH_DOMAIN"`
		Port                           int               `ini:"SSH_PORT"`
		ListenHost                     string            `ini:"SSH_LISTEN_HOST"`
		ListenPort                     int               `ini:"SSH_LISTEN_PORT"`
		RootPath                       string            `ini:"SSH_ROOT_PATH"`
		ServerCiphers                  []string          `ini:"SSH_SERVER_CIPHERS"`
		ServerKeyExchanges             []string          `ini:"SSH_SERVER_KEY_EXCHANGES"`
		ServerMACs                     []string          `ini:"SSH_SERVER_MACS"`
		KeyTestPath                    string            `ini:"SSH_KEY_TEST_PATH"`
		KeygenPath                     string            `ini:"SSH_KEYGEN_PATH"`
		AuthorizedKeysBackup           bool              `ini:"SSH_AUTHORIZED_KEYS_BACKUP"`
		AuthorizedPrincipalsBackup     bool              `ini:"SSH_AUTHORIZED_PRINCIPALS_BACKUP"`
		MinimumKeySizeCheck            bool              `ini:"-"`
		MinimumKeySizes                map[string]int    `ini:"-"`
		CreateAuthorizedKeysFile       bool              `ini:"SSH_CREATE_AUTHORIZED_KEYS_FILE"`
		CreateAuthorizedPrincipalsFile bool              `ini:"SSH_CREATE_AUTHORIZED_PRINCIPALS_FILE"`
		ExposeAnonymous                bool              `ini:"SSH_EXPOSE_ANONYMOUS"`
		AuthorizedPrincipalsAllow      []string          `ini:"SSH_AUTHORIZED_PRINCIPALS_ALLOW"`
		AuthorizedPrincipalsEnabled    bool              `ini:"-"`
		TrustedUserCAKeys              []string          `ini:"SSH_TRUSTED_USER_CA_KEYS"`
		TrustedUserCAKeysFile          string            `ini:"SSH_TRUSTED_USER_CA_KEYS_FILENAME"`
		TrustedUserCAKeysParsed        []gossh.PublicKey `ini:"-"`
	}{
		Disabled:            false,
		StartBuiltinServer:  false,
		Domain:              "",
		Port:                22,
		ServerCiphers:       []string{"aes128-ctr", "aes192-ctr", "aes256-ctr", "aes128-gcm@openssh.com", "arcfour256", "arcfour128"},
		ServerKeyExchanges:  []string{"diffie-hellman-group1-sha1", "diffie-hellman-group14-sha1", "ecdh-sha2-nistp256", "ecdh-sha2-nistp384", "ecdh-sha2-nistp521", "curve25519-sha256@libssh.org"},
		ServerMACs:          []string{"hmac-sha2-256-etm@openssh.com", "hmac-sha2-256", "hmac-sha1", "hmac-sha1-96"},
		KeygenPath:          "ssh-keygen",
		MinimumKeySizeCheck: true,
		MinimumKeySizes:     map[string]int{"ed25519": 256, "ecdsa": 256, "rsa": 2048},
	}

	// Security settings
	InstallLock                        bool
	SecretKey                          string
	LogInRememberDays                  int
	CookieUserName                     string
	CookieRememberName                 string
	ReverseProxyAuthUser               string
	ReverseProxyAuthEmail              string
	MinPasswordLength                  int
	ImportLocalPaths                   bool
	DisableGitHooks                    bool
	OnlyAllowPushIfGiteaEnvironmentSet bool
	PasswordComplexity                 []string
	PasswordHashAlgo                   string
	PasswordCheckPwn                   bool

	// UI settings
	UI = struct {
		ExplorePagingNum      int
		IssuePagingNum        int
		RepoSearchPagingNum   int
		MembersPagingNum      int
		FeedMaxCommitNum      int
		FeedPagingNum         int
		GraphMaxCommitNum     int
		CodeCommentLines      int
		ReactionMaxUserNum    int
		ThemeColorMetaTag     string
		MaxDisplayFileSize    int64
		ShowUserEmail         bool
		DefaultShowFullName   bool
		DefaultTheme          string
		Themes                []string
		Reactions             []string
		ReactionsMap          map[string]bool
		SearchRepoDescription bool
		UseServiceWorker      bool

		Notification struct {
			MinTimeout            time.Duration
			TimeoutStep           time.Duration
			MaxTimeout            time.Duration
			EventSourceUpdateTime time.Duration
		} `ini:"ui.notification"`

		Admin struct {
			UserPagingNum   int
			RepoPagingNum   int
			NoticePagingNum int
			OrgPagingNum    int
		} `ini:"ui.admin"`
		User struct {
			RepoPagingNum int
		} `ini:"ui.user"`
		Meta struct {
			Author      string
			Description string
			Keywords    string
		} `ini:"ui.meta"`
	}{
		ExplorePagingNum:    20,
		IssuePagingNum:      10,
		RepoSearchPagingNum: 10,
		MembersPagingNum:    20,
		FeedMaxCommitNum:    5,
		FeedPagingNum:       20,
		GraphMaxCommitNum:   100,
		CodeCommentLines:    4,
		ReactionMaxUserNum:  10,
		ThemeColorMetaTag:   `#6cc644`,
		MaxDisplayFileSize:  8388608,
		DefaultTheme:        `gitea`,
		Themes:              []string{`gitea`, `arc-green`},
		Reactions:           []string{`+1`, `-1`, `laugh`, `hooray`, `confused`, `heart`, `rocket`, `eyes`},
		Notification: struct {
			MinTimeout            time.Duration
			TimeoutStep           time.Duration
			MaxTimeout            time.Duration
			EventSourceUpdateTime time.Duration
		}{
			MinTimeout:            10 * time.Second,
			TimeoutStep:           10 * time.Second,
			MaxTimeout:            60 * time.Second,
			EventSourceUpdateTime: 10 * time.Second,
		},
		Admin: struct {
			UserPagingNum   int
			RepoPagingNum   int
			NoticePagingNum int
			OrgPagingNum    int
		}{
			UserPagingNum:   50,
			RepoPagingNum:   50,
			NoticePagingNum: 25,
			OrgPagingNum:    50,
		},
		User: struct {
			RepoPagingNum int
		}{
			RepoPagingNum: 15,
		},
		Meta: struct {
			Author      string
			Description string
			Keywords    string
		}{
			Author:      "Gitea - Git with a cup of tea",
			Description: "Gitea (Git with a cup of tea) is a painless self-hosted Git service written in Go",
			Keywords:    "go,git,self-hosted,gitea",
		},
	}

	// Markdown settings
	Markdown = struct {
		EnableHardLineBreakInComments  bool
		EnableHardLineBreakInDocuments bool
		CustomURLSchemes               []string `ini:"CUSTOM_URL_SCHEMES"`
		FileExtensions                 []string
	}{
		EnableHardLineBreakInComments:  true,
		EnableHardLineBreakInDocuments: false,
		FileExtensions:                 strings.Split(".md,.markdown,.mdown,.mkd", ","),
	}

	// Admin settings
	Admin struct {
		DisableRegularOrgCreation bool
		DefaultEmailNotification  string
	}

	// Log settings
	LogLevel           string
	StacktraceLogLevel string
	LogRootPath        string
	RedirectMacaronLog bool
	DisableRouterLog   bool
	RouterLogLevel     log.Level
	RouterLogMode      string
	EnableAccessLog    bool
	AccessLogTemplate  string
	EnableXORMLog      bool

	// Time settings
	TimeFormat string
	// UILocation is the location on the UI, so that we can display the time on UI.
	DefaultUILocation = time.Local

	CSRFCookieName     = "_csrf"
	CSRFCookieHTTPOnly = true

	// Mirror settings
	Mirror struct {
		DefaultInterval time.Duration
		MinInterval     time.Duration
	}

	// API settings
	API = struct {
		EnableSwagger          bool
		SwaggerURL             string
		MaxResponseItems       int
		DefaultPagingNum       int
		DefaultGitTreesPerPage int
		DefaultMaxBlobSize     int64
	}{
		EnableSwagger:          true,
		SwaggerURL:             "",
		MaxResponseItems:       50,
		DefaultPagingNum:       30,
		DefaultGitTreesPerPage: 1000,
		DefaultMaxBlobSize:     10485760,
	}

	OAuth2 = struct {
		Enable                     bool
		AccessTokenExpirationTime  int64
		RefreshTokenExpirationTime int64
		InvalidateRefreshTokens    bool
		JWTSecretBytes             []byte `ini:"-"`
		JWTSecretBase64            string `ini:"JWT_SECRET"`
		MaxTokenLength             int
	}{
		Enable:                     true,
		AccessTokenExpirationTime:  3600,
		RefreshTokenExpirationTime: 730,
		InvalidateRefreshTokens:    false,
		MaxTokenLength:             math.MaxInt16,
	}

	U2F = struct {
		AppID         string
		TrustedFacets []string
	}{}

	// Metrics settings
	Metrics = struct {
		Enabled bool
		Token   string
	}{
		Enabled: false,
		Token:   "",
	}

	// I18n settings
	Langs []string
	Names []string

	// Highlight settings are loaded in modules/template/highlight.go

	// Other settings
	ShowFooterBranding         bool
	ShowFooterVersion          bool
	ShowFooterTemplateLoadTime bool

	// Global setting objects
	Cfg           *ini.File
	CustomPath    string // Custom directory path
	CustomConf    string
	PIDFile       = "/run/gitea.pid"
	WritePIDFile  bool
	ProdMode      bool
	RunMode       string
	RunUser       string
	IsWindows     bool
	HasRobotsTxt  bool
	InternalToken string // internal access token

	// UILocation is the location on the UI, so that we can display the time on UI.
	// Currently only show the default time.Local, it could be added to app.ini after UI is ready
	UILocation = time.Local
)

func getAppPath() (string, error) {
	var appPath string
	var err error
	if IsWindows && filepath.IsAbs(os.Args[0]) {
		appPath = filepath.Clean(os.Args[0])
	} else {
		appPath, err = exec.LookPath(os.Args[0])
	}

	if err != nil {
		return "", err
	}
	appPath, err = filepath.Abs(appPath)
	if err != nil {
		return "", err
	}
	// Note: we don't use path.Dir here because it does not handle case
	//	which path starts with two "/" in Windows: "//psf/Home/..."
	return strings.ReplaceAll(appPath, "\\", "/"), err
}

func getWorkPath(appPath string) string {
	workPath := AppWorkPath

	if giteaWorkPath, ok := os.LookupEnv("GITEA_WORK_DIR"); ok {
		workPath = giteaWorkPath
	}
	if len(workPath) == 0 {
		i := strings.LastIndex(appPath, "/")
		if i == -1 {
			workPath = appPath
		} else {
			workPath = appPath[:i]
		}
	}
	return strings.ReplaceAll(workPath, "\\", "/")
}

func init() {
	IsWindows = runtime.GOOS == "windows"
	// We can rely on log.CanColorStdout being set properly because modules/log/console_windows.go comes before modules/setting/setting.go lexicographically
	log.NewLogger(0, "console", "console", fmt.Sprintf(`{"level": "trace", "colorize": %t, "stacktraceLevel": "none"}`, log.CanColorStdout))

	var err error
	if AppPath, err = getAppPath(); err != nil {
		log.Fatal("Failed to get app path: %v", err)
	}
	AppWorkPath = getWorkPath(AppPath)
}

func forcePathSeparator(path string) {
	if strings.Contains(path, "\\") {
		log.Fatal("Do not use '\\' or '\\\\' in paths, instead, please use '/' in all places")
	}
}

// IsRunUserMatchCurrentUser returns false if configured run user does not match
// actual user that runs the app. The first return value is the actual user name.
// This check is ignored under Windows since SSH remote login is not the main
// method to login on Windows.
func IsRunUserMatchCurrentUser(runUser string) (string, bool) {
	if IsWindows || SSH.StartBuiltinServer {
		return "", true
	}

	currentUser := user.CurrentUsername()
	return currentUser, runUser == currentUser
}

func createPIDFile(pidPath string) {
	currentPid := os.Getpid()
	if err := os.MkdirAll(filepath.Dir(pidPath), os.ModePerm); err != nil {
		log.Fatal("Failed to create PID folder: %v", err)
	}

	file, err := os.Create(pidPath)
	if err != nil {
		log.Fatal("Failed to create PID file: %v", err)
	}
	defer file.Close()
	if _, err := file.WriteString(strconv.FormatInt(int64(currentPid), 10)); err != nil {
		log.Fatal("Failed to write PID information: %v", err)
	}
}

// SetCustomPathAndConf will set CustomPath and CustomConf with reference to the
// GITEA_CUSTOM environment variable and with provided overrides before stepping
// back to the default
func SetCustomPathAndConf(providedCustom, providedConf, providedWorkPath string) {
	if len(providedWorkPath) != 0 {
		AppWorkPath = filepath.ToSlash(providedWorkPath)
	}
	if giteaCustom, ok := os.LookupEnv("GITEA_CUSTOM"); ok {
		CustomPath = giteaCustom
	}
	if len(providedCustom) != 0 {
		CustomPath = providedCustom
	}
	if len(CustomPath) == 0 {
		CustomPath = path.Join(AppWorkPath, "custom")
	} else if !filepath.IsAbs(CustomPath) {
		CustomPath = path.Join(AppWorkPath, CustomPath)
	}

	if len(providedConf) != 0 {
		CustomConf = providedConf
	}
	if len(CustomConf) == 0 {
		CustomConf = path.Join(CustomPath, "conf/app.ini")
	} else if !filepath.IsAbs(CustomConf) {
		CustomConf = path.Join(CustomPath, CustomConf)
		log.Warn("Using 'custom' directory as relative origin for configuration file: '%s'", CustomConf)
	}
}

// NewContext initializes configuration context.
// NOTE: do not print any log except error.
func NewContext() {
	Cfg = ini.Empty()

	if WritePIDFile && len(PIDFile) > 0 {
		createPIDFile(PIDFile)
	}

	isFile, err := util.IsFile(CustomConf)
	if err != nil {
		log.Error("Unable to check if %s is a file. Error: %v", CustomConf, err)
	}
	if isFile {
		if err := Cfg.Append(CustomConf); err != nil {
			log.Fatal("Failed to load custom conf '%s': %v", CustomConf, err)
		}
	} else {
		log.Warn("Custom config '%s' not found, ignore this if you're running first time", CustomConf)
	}
	Cfg.NameMapper = ini.SnackCase

	homeDir, err := com.HomeDir()
	if err != nil {
		log.Fatal("Failed to get home directory: %v", err)
	}
	homeDir = strings.ReplaceAll(homeDir, "\\", "/")

	LogLevel = getLogLevel(Cfg.Section("log"), "LEVEL", "Info")
	StacktraceLogLevel = getStacktraceLogLevel(Cfg.Section("log"), "STACKTRACE_LEVEL", "None")
	LogRootPath = Cfg.Section("log").Key("ROOT_PATH").MustString(path.Join(AppWorkPath, "log"))
	forcePathSeparator(LogRootPath)
	RedirectMacaronLog = Cfg.Section("log").Key("REDIRECT_MACARON_LOG").MustBool(false)
	RouterLogLevel = log.FromString(Cfg.Section("log").Key("ROUTER_LOG_LEVEL").MustString("Info"))

	sec := Cfg.Section("server")
	AppName = Cfg.Section("").Key("APP_NAME").MustString("Gitea: Git with a cup of tea")

	Protocol = HTTP
	switch sec.Key("PROTOCOL").String() {
	case "https":
		Protocol = HTTPS
		CertFile = sec.Key("CERT_FILE").String()
		KeyFile = sec.Key("KEY_FILE").String()
		if !filepath.IsAbs(CertFile) && len(CertFile) > 0 {
			CertFile = filepath.Join(CustomPath, CertFile)
		}
		if !filepath.IsAbs(KeyFile) && len(KeyFile) > 0 {
			KeyFile = filepath.Join(CustomPath, KeyFile)
		}
	case "fcgi":
		Protocol = FCGI
	case "fcgi+unix":
		Protocol = FCGIUnix
		UnixSocketPermissionRaw := sec.Key("UNIX_SOCKET_PERMISSION").MustString("666")
		UnixSocketPermissionParsed, err := strconv.ParseUint(UnixSocketPermissionRaw, 8, 32)
		if err != nil || UnixSocketPermissionParsed > 0777 {
			log.Fatal("Failed to parse unixSocketPermission: %s", UnixSocketPermissionRaw)
		}
		UnixSocketPermission = uint32(UnixSocketPermissionParsed)
	case "unix":
		Protocol = UnixSocket
		UnixSocketPermissionRaw := sec.Key("UNIX_SOCKET_PERMISSION").MustString("666")
		UnixSocketPermissionParsed, err := strconv.ParseUint(UnixSocketPermissionRaw, 8, 32)
		if err != nil || UnixSocketPermissionParsed > 0777 {
			log.Fatal("Failed to parse unixSocketPermission: %s", UnixSocketPermissionRaw)
		}
		UnixSocketPermission = uint32(UnixSocketPermissionParsed)
	}
	EnableLetsEncrypt = sec.Key("ENABLE_LETSENCRYPT").MustBool(false)
	LetsEncryptTOS = sec.Key("LETSENCRYPT_ACCEPTTOS").MustBool(false)
	if !LetsEncryptTOS && EnableLetsEncrypt {
		log.Warn("Failed to enable Let's Encrypt due to Let's Encrypt TOS not being accepted")
		EnableLetsEncrypt = false
	}
	LetsEncryptDirectory = sec.Key("LETSENCRYPT_DIRECTORY").MustString("https")
	LetsEncryptEmail = sec.Key("LETSENCRYPT_EMAIL").MustString("")
	Domain = sec.Key("DOMAIN").MustString("localhost")
	HTTPAddr = sec.Key("HTTP_ADDR").MustString("0.0.0.0")
	HTTPPort = sec.Key("HTTP_PORT").MustString("3000")
	GracefulRestartable = sec.Key("ALLOW_GRACEFUL_RESTARTS").MustBool(true)
	GracefulHammerTime = sec.Key("GRACEFUL_HAMMER_TIME").MustDuration(60 * time.Second)
	StartupTimeout = sec.Key("STARTUP_TIMEOUT").MustDuration(0 * time.Second)

	defaultAppURL := string(Protocol) + "://" + Domain
	if (Protocol == HTTP && HTTPPort != "80") || (Protocol == HTTPS && HTTPPort != "443") {
		defaultAppURL += ":" + HTTPPort
	}
	AppURL = sec.Key("ROOT_URL").MustString(defaultAppURL)
	AppURL = strings.TrimSuffix(AppURL, "/") + "/"

	// Check if has app suburl.
	appURL, err := url.Parse(AppURL)
	if err != nil {
		log.Fatal("Invalid ROOT_URL '%s': %s", AppURL, err)
	}
	// Suburl should start with '/' and end without '/', such as '/{subpath}'.
	// This value is empty if site does not have sub-url.
	AppSubURL = strings.TrimSuffix(appURL.Path, "/")
	StaticURLPrefix = strings.TrimSuffix(sec.Key("STATIC_URL_PREFIX").MustString(AppSubURL), "/")
	AppSubURLDepth = strings.Count(AppSubURL, "/")
	// Check if Domain differs from AppURL domain than update it to AppURL's domain
	urlHostname := appURL.Hostname()
	if urlHostname != Domain && net.ParseIP(urlHostname) == nil && urlHostname != "" {
		Domain = urlHostname
	}

	var defaultLocalURL string
	switch Protocol {
	case UnixSocket:
		defaultLocalURL = "http://unix/"
	case FCGI:
		defaultLocalURL = AppURL
	case FCGIUnix:
		defaultLocalURL = AppURL
	default:
		defaultLocalURL = string(Protocol) + "://"
		if HTTPAddr == "0.0.0.0" {
			defaultLocalURL += net.JoinHostPort("localhost", HTTPPort) + "/"
		} else {
			defaultLocalURL += net.JoinHostPort(HTTPAddr, HTTPPort) + "/"
		}
	}
	LocalURL = sec.Key("LOCAL_ROOT_URL").MustString(defaultLocalURL)
	RedirectOtherPort = sec.Key("REDIRECT_OTHER_PORT").MustBool(false)
	PortToRedirect = sec.Key("PORT_TO_REDIRECT").MustString("80")
	OfflineMode = sec.Key("OFFLINE_MODE").MustBool()
	DisableRouterLog = sec.Key("DISABLE_ROUTER_LOG").MustBool()
	if len(StaticRootPath) == 0 {
		StaticRootPath = AppWorkPath
	}
	StaticRootPath = sec.Key("STATIC_ROOT_PATH").MustString(StaticRootPath)
	StaticCacheTime = sec.Key("STATIC_CACHE_TIME").MustDuration(6 * time.Hour)
	AppDataPath = sec.Key("APP_DATA_PATH").MustString(path.Join(AppWorkPath, "data"))
	EnableGzip = sec.Key("ENABLE_GZIP").MustBool()
	EnablePprof = sec.Key("ENABLE_PPROF").MustBool(false)
	PprofDataPath = sec.Key("PPROF_DATA_PATH").MustString(path.Join(AppWorkPath, "data/tmp/pprof"))
	if !filepath.IsAbs(PprofDataPath) {
		PprofDataPath = filepath.Join(AppWorkPath, PprofDataPath)
	}

	switch sec.Key("LANDING_PAGE").MustString("home") {
	case "explore":
		LandingPageURL = LandingPageExplore
	case "organizations":
		LandingPageURL = LandingPageOrganizations
	case "login":
		LandingPageURL = LandingPageLogin
	default:
		LandingPageURL = LandingPageHome
	}

	if len(SSH.Domain) == 0 {
		SSH.Domain = Domain
	}
	SSH.RootPath = path.Join(homeDir, ".ssh")
	serverCiphers := sec.Key("SSH_SERVER_CIPHERS").Strings(",")
	if len(serverCiphers) > 0 {
		SSH.ServerCiphers = serverCiphers
	}
	serverKeyExchanges := sec.Key("SSH_SERVER_KEY_EXCHANGES").Strings(",")
	if len(serverKeyExchanges) > 0 {
		SSH.ServerKeyExchanges = serverKeyExchanges
	}
	serverMACs := sec.Key("SSH_SERVER_MACS").Strings(",")
	if len(serverMACs) > 0 {
		SSH.ServerMACs = serverMACs
	}
	SSH.KeyTestPath = os.TempDir()
	if err = Cfg.Section("server").MapTo(&SSH); err != nil {
		log.Fatal("Failed to map SSH settings: %v", err)
	}

	SSH.KeygenPath = sec.Key("SSH_KEYGEN_PATH").MustString("ssh-keygen")
	SSH.Port = sec.Key("SSH_PORT").MustInt(22)
	SSH.ListenPort = sec.Key("SSH_LISTEN_PORT").MustInt(SSH.Port)

	// When disable SSH, start builtin server value is ignored.
	if SSH.Disabled {
		SSH.StartBuiltinServer = false
	}

	trustedUserCaKeys := sec.Key("SSH_TRUSTED_USER_CA_KEYS").Strings(",")
	for _, caKey := range trustedUserCaKeys {
		pubKey, _, _, _, err := gossh.ParseAuthorizedKey([]byte(caKey))
		if err != nil {
			log.Fatal("Failed to parse TrustedUserCaKeys: %s %v", caKey, err)
		}

		SSH.TrustedUserCAKeysParsed = append(SSH.TrustedUserCAKeysParsed, pubKey)
	}
	if len(trustedUserCaKeys) > 0 {
		// Set the default as email,username otherwise we can leave it empty
		sec.Key("SSH_AUTHORIZED_PRINCIPALS_ALLOW").MustString("username,email")
	} else {
		sec.Key("SSH_AUTHORIZED_PRINCIPALS_ALLOW").MustString("off")
	}

	SSH.AuthorizedPrincipalsAllow, SSH.AuthorizedPrincipalsEnabled = parseAuthorizedPrincipalsAllow(sec.Key("SSH_AUTHORIZED_PRINCIPALS_ALLOW").Strings(","))

	if !SSH.Disabled && !SSH.StartBuiltinServer {
		if err := os.MkdirAll(SSH.RootPath, 0700); err != nil {
			log.Fatal("Failed to create '%s': %v", SSH.RootPath, err)
		} else if err = os.MkdirAll(SSH.KeyTestPath, 0644); err != nil {
			log.Fatal("Failed to create '%s': %v", SSH.KeyTestPath, err)
		}

		if len(trustedUserCaKeys) > 0 && SSH.AuthorizedPrincipalsEnabled {
			fname := sec.Key("SSH_TRUSTED_USER_CA_KEYS_FILENAME").MustString(filepath.Join(SSH.RootPath, "gitea-trusted-user-ca-keys.pem"))
			if err := ioutil.WriteFile(fname,
				[]byte(strings.Join(trustedUserCaKeys, "\n")), 0600); err != nil {
				log.Fatal("Failed to create '%s': %v", fname, err)
			}
		}
	}

	SSH.MinimumKeySizeCheck = sec.Key("MINIMUM_KEY_SIZE_CHECK").MustBool(SSH.MinimumKeySizeCheck)
	minimumKeySizes := Cfg.Section("ssh.minimum_key_sizes").Keys()
	for _, key := range minimumKeySizes {
		if key.MustInt() != -1 {
			SSH.MinimumKeySizes[strings.ToLower(key.Name())] = key.MustInt()
		} else {
			delete(SSH.MinimumKeySizes, strings.ToLower(key.Name()))
		}
	}

	SSH.AuthorizedKeysBackup = sec.Key("SSH_AUTHORIZED_KEYS_BACKUP").MustBool(true)
	SSH.CreateAuthorizedKeysFile = sec.Key("SSH_CREATE_AUTHORIZED_KEYS_FILE").MustBool(true)

	SSH.AuthorizedPrincipalsBackup = false
	SSH.CreateAuthorizedPrincipalsFile = false
	if SSH.AuthorizedPrincipalsEnabled {
		SSH.AuthorizedPrincipalsBackup = sec.Key("SSH_AUTHORIZED_PRINCIPALS_BACKUP").MustBool(true)
		SSH.CreateAuthorizedPrincipalsFile = sec.Key("SSH_CREATE_AUTHORIZED_PRINCIPALS_FILE").MustBool(true)
	}

	SSH.ExposeAnonymous = sec.Key("SSH_EXPOSE_ANONYMOUS").MustBool(false)

	if err = Cfg.Section("oauth2").MapTo(&OAuth2); err != nil {
		log.Fatal("Failed to OAuth2 settings: %v", err)
		return
	}

	if OAuth2.Enable {
		OAuth2.JWTSecretBytes = make([]byte, 32)
		n, err := base64.RawURLEncoding.Decode(OAuth2.JWTSecretBytes, []byte(OAuth2.JWTSecretBase64))

		if err != nil || n != 32 {
			OAuth2.JWTSecretBase64, err = generate.NewJwtSecret()
			if err != nil {
				log.Fatal("error generating JWT secret: %v", err)
				return
			}
			cfg := ini.Empty()
			isFile, err := util.IsFile(CustomConf)
			if err != nil {
				log.Error("Unable to check if %s is a file. Error: %v", CustomConf, err)
			}
			if isFile {
				if err := cfg.Append(CustomConf); err != nil {
					log.Error("failed to load custom conf %s: %v", CustomConf, err)
					return
				}
			}
			cfg.Section("oauth2").Key("JWT_SECRET").SetValue(OAuth2.JWTSecretBase64)

			if err := os.MkdirAll(filepath.Dir(CustomConf), os.ModePerm); err != nil {
				log.Fatal("failed to create '%s': %v", CustomConf, err)
				return
			}
			if err := cfg.SaveTo(CustomConf); err != nil {
				log.Fatal("error saving generating JWT secret to custom config: %v", err)
				return
			}
		}
	}

	sec = Cfg.Section("admin")
	Admin.DefaultEmailNotification = sec.Key("DEFAULT_EMAIL_NOTIFICATIONS").MustString("enabled")

	sec = Cfg.Section("security")
	InstallLock = sec.Key("INSTALL_LOCK").MustBool(false)
	SecretKey = sec.Key("SECRET_KEY").MustString("!#@FDEWREWR&*(")
	LogInRememberDays = sec.Key("LOGIN_REMEMBER_DAYS").MustInt(7)
	CookieUserName = sec.Key("COOKIE_USERNAME").MustString("gitea_awesome")
	CookieRememberName = sec.Key("COOKIE_REMEMBER_NAME").MustString("gitea_incredible")
	ReverseProxyAuthUser = sec.Key("REVERSE_PROXY_AUTHENTICATION_USER").MustString("X-WEBAUTH-USER")
	ReverseProxyAuthEmail = sec.Key("REVERSE_PROXY_AUTHENTICATION_EMAIL").MustString("X-WEBAUTH-EMAIL")
	MinPasswordLength = sec.Key("MIN_PASSWORD_LENGTH").MustInt(6)
	ImportLocalPaths = sec.Key("IMPORT_LOCAL_PATHS").MustBool(false)
	DisableGitHooks = sec.Key("DISABLE_GIT_HOOKS").MustBool(true)
	OnlyAllowPushIfGiteaEnvironmentSet = sec.Key("ONLY_ALLOW_PUSH_IF_GITEA_ENVIRONMENT_SET").MustBool(true)
	PasswordHashAlgo = sec.Key("PASSWORD_HASH_ALGO").MustString("argon2")
	CSRFCookieHTTPOnly = sec.Key("CSRF_COOKIE_HTTP_ONLY").MustBool(true)
	PasswordCheckPwn = sec.Key("PASSWORD_CHECK_PWN").MustBool(false)

	InternalToken = loadInternalToken(sec)

	cfgdata := sec.Key("PASSWORD_COMPLEXITY").Strings(",")
	if len(cfgdata) == 0 {
		cfgdata = []string{"off"}
	}
	PasswordComplexity = make([]string, 0, len(cfgdata))
	for _, name := range cfgdata {
		name := strings.ToLower(strings.Trim(name, `"`))
		if name != "" {
			PasswordComplexity = append(PasswordComplexity, name)
		}
	}

	newAttachmentService()
	newLFSService()

	timeFormatKey := Cfg.Section("time").Key("FORMAT").MustString("")
	if timeFormatKey != "" {
		TimeFormat = map[string]string{
			"ANSIC":       time.ANSIC,
			"UnixDate":    time.UnixDate,
			"RubyDate":    time.RubyDate,
			"RFC822":      time.RFC822,
			"RFC822Z":     time.RFC822Z,
			"RFC850":      time.RFC850,
			"RFC1123":     time.RFC1123,
			"RFC1123Z":    time.RFC1123Z,
			"RFC3339":     time.RFC3339,
			"RFC3339Nano": time.RFC3339Nano,
			"Kitchen":     time.Kitchen,
			"Stamp":       time.Stamp,
			"StampMilli":  time.StampMilli,
			"StampMicro":  time.StampMicro,
			"StampNano":   time.StampNano,
		}[timeFormatKey]
		// When the TimeFormatKey does not exist in the previous map e.g.'2006-01-02 15:04:05'
		if len(TimeFormat) == 0 {
			TimeFormat = timeFormatKey
			TestTimeFormat, _ := time.Parse(TimeFormat, TimeFormat)
			if TestTimeFormat.Format(time.RFC3339) != "2006-01-02T15:04:05Z" {
				log.Warn("Provided TimeFormat: %s does not create a fully specified date and time.", TimeFormat)
				log.Warn("In order to display dates and times correctly please check your time format has 2006, 01, 02, 15, 04 and 05")
			}
			log.Trace("Custom TimeFormat: %s", TimeFormat)
		}
	}

	zone := Cfg.Section("time").Key("DEFAULT_UI_LOCATION").String()
	if zone != "" {
		DefaultUILocation, err = time.LoadLocation(zone)
		if err != nil {
			log.Fatal("Load time zone failed: %v", err)
		} else {
			log.Info("Default UI Location is %v", zone)
		}
	}
	if DefaultUILocation == nil {
		DefaultUILocation = time.Local
	}

	RunUser = Cfg.Section("").Key("RUN_USER").MustString(user.CurrentUsername())
	RunMode = Cfg.Section("").Key("RUN_MODE").MustString("dev")
	// Does not check run user when the install lock is off.
	if InstallLock {
		currentUser, match := IsRunUserMatchCurrentUser(RunUser)
		if !match {
			log.Fatal("Expect user '%s' but current user is: %s", RunUser, currentUser)
		}
	}

	SSH.BuiltinServerUser = Cfg.Section("server").Key("BUILTIN_SSH_SERVER_USER").MustString(RunUser)

	newRepository()

	newPictureService()

	if err = Cfg.Section("ui").MapTo(&UI); err != nil {
		log.Fatal("Failed to map UI settings: %v", err)
	} else if err = Cfg.Section("markdown").MapTo(&Markdown); err != nil {
		log.Fatal("Failed to map Markdown settings: %v", err)
	} else if err = Cfg.Section("admin").MapTo(&Admin); err != nil {
		log.Fatal("Fail to map Admin settings: %v", err)
	} else if err = Cfg.Section("api").MapTo(&API); err != nil {
		log.Fatal("Failed to map API settings: %v", err)
	} else if err = Cfg.Section("metrics").MapTo(&Metrics); err != nil {
		log.Fatal("Failed to map Metrics settings: %v", err)
	}

	u := *appURL
	u.Path = path.Join(u.Path, "api", "swagger")
	API.SwaggerURL = u.String()

	newGit()

	sec = Cfg.Section("mirror")
	Mirror.MinInterval = sec.Key("MIN_INTERVAL").MustDuration(10 * time.Minute)
	Mirror.DefaultInterval = sec.Key("DEFAULT_INTERVAL").MustDuration(8 * time.Hour)
	if Mirror.MinInterval.Minutes() < 1 {
		log.Warn("Mirror.MinInterval is too low")
		Mirror.MinInterval = 1 * time.Minute
	}
	if Mirror.DefaultInterval < Mirror.MinInterval {
		log.Warn("Mirror.DefaultInterval is less than Mirror.MinInterval")
		Mirror.DefaultInterval = time.Hour * 8
	}

	Langs = Cfg.Section("i18n").Key("LANGS").Strings(",")
	if len(Langs) == 0 {
		Langs = []string{
			"en-US", "zh-CN", "zh-HK", "zh-TW", "de-DE", "fr-FR", "nl-NL", "lv-LV",
			"ru-RU", "uk-UA", "ja-JP", "es-ES", "pt-BR", "pt-PT", "pl-PL", "bg-BG",
			"it-IT", "fi-FI", "tr-TR", "cs-CZ", "sr-SP", "sv-SE", "ko-KR"}
	}
	Names = Cfg.Section("i18n").Key("NAMES").Strings(",")
	if len(Names) == 0 {
		Names = []string{"English", "简体中文", "繁體中文（香港）", "繁體中文（台灣）", "Deutsch",
			"français", "Nederlands", "latviešu", "русский", "Українська", "日本語",
			"español", "português do Brasil", "Português de Portugal", "polski", "български",
			"italiano", "suomi", "Türkçe", "čeština", "српски", "svenska", "한국어"}
	}

	ShowFooterBranding = Cfg.Section("other").Key("SHOW_FOOTER_BRANDING").MustBool(false)
	ShowFooterVersion = Cfg.Section("other").Key("SHOW_FOOTER_VERSION").MustBool(true)
	ShowFooterTemplateLoadTime = Cfg.Section("other").Key("SHOW_FOOTER_TEMPLATE_LOAD_TIME").MustBool(true)

	UI.ShowUserEmail = Cfg.Section("ui").Key("SHOW_USER_EMAIL").MustBool(true)
	UI.DefaultShowFullName = Cfg.Section("ui").Key("DEFAULT_SHOW_FULL_NAME").MustBool(false)
	UI.SearchRepoDescription = Cfg.Section("ui").Key("SEARCH_REPO_DESCRIPTION").MustBool(true)
	UI.UseServiceWorker = Cfg.Section("ui").Key("USE_SERVICE_WORKER").MustBool(true)

	HasRobotsTxt, err = util.IsFile(path.Join(CustomPath, "robots.txt"))
	if err != nil {
		log.Error("Unable to check if %s is a file. Error: %v", path.Join(CustomPath, "robots.txt"), err)
	}

	newMarkup()

	sec = Cfg.Section("U2F")
	U2F.TrustedFacets, _ = shellquote.Split(sec.Key("TRUSTED_FACETS").MustString(strings.TrimSuffix(AppURL, AppSubURL+"/")))
	U2F.AppID = sec.Key("APP_ID").MustString(strings.TrimSuffix(AppURL, "/"))

	UI.ReactionsMap = make(map[string]bool)
	for _, reaction := range UI.Reactions {
		UI.ReactionsMap[reaction] = true
	}
}

func parseAuthorizedPrincipalsAllow(values []string) ([]string, bool) {
	anything := false
	email := false
	username := false
	for _, value := range values {
		v := strings.ToLower(strings.TrimSpace(value))
		switch v {
		case "off":
			return []string{"off"}, false
		case "email":
			email = true
		case "username":
			username = true
		case "anything":
			anything = true
		}
	}
	if anything {
		return []string{"anything"}, true
	}

	authorizedPrincipalsAllow := []string{}
	if username {
		authorizedPrincipalsAllow = append(authorizedPrincipalsAllow, "username")
	}
	if email {
		authorizedPrincipalsAllow = append(authorizedPrincipalsAllow, "email")
	}

	return authorizedPrincipalsAllow, true
}

func loadInternalToken(sec *ini.Section) string {
	uri := sec.Key("INTERNAL_TOKEN_URI").String()
	if len(uri) == 0 {
		return loadOrGenerateInternalToken(sec)
	}
	tempURI, err := url.Parse(uri)
	if err != nil {
		log.Fatal("Failed to parse INTERNAL_TOKEN_URI (%s): %v", uri, err)
	}
	switch tempURI.Scheme {
	case "file":
		fp, err := os.OpenFile(tempURI.RequestURI(), os.O_RDWR, 0600)
		if err != nil {
			log.Fatal("Failed to open InternalTokenURI (%s): %v", uri, err)
		}
		defer fp.Close()

		buf, err := ioutil.ReadAll(fp)
		if err != nil {
			log.Fatal("Failed to read InternalTokenURI (%s): %v", uri, err)
		}
		// No token in the file, generate one and store it.
		if len(buf) == 0 {
			token, err := generate.NewInternalToken()
			if err != nil {
				log.Fatal("Error generate internal token: %v", err)
			}
			if _, err := io.WriteString(fp, token); err != nil {
				log.Fatal("Error writing to InternalTokenURI (%s): %v", uri, err)
			}
			return token
		}

		return strings.TrimSpace(string(buf))
	default:
		log.Fatal("Unsupported URI-Scheme %q (INTERNAL_TOKEN_URI = %q)", tempURI.Scheme, uri)
	}
	return ""
}

func loadOrGenerateInternalToken(sec *ini.Section) string {
	var err error
	token := sec.Key("INTERNAL_TOKEN").String()
	if len(token) == 0 {
		token, err = generate.NewInternalToken()
		if err != nil {
			log.Fatal("Error generate internal token: %v", err)
		}

		// Save secret
		cfgSave := ini.Empty()
		isFile, err := util.IsFile(CustomConf)
		if err != nil {
			log.Error("Unable to check if %s is a file. Error: %v", CustomConf, err)
		}
		if isFile {
			// Keeps custom settings if there is already something.
			if err := cfgSave.Append(CustomConf); err != nil {
				log.Error("Failed to load custom conf '%s': %v", CustomConf, err)
			}
		}

		cfgSave.Section("security").Key("INTERNAL_TOKEN").SetValue(token)

		if err := os.MkdirAll(filepath.Dir(CustomConf), os.ModePerm); err != nil {
			log.Fatal("Failed to create '%s': %v", CustomConf, err)
		}
		if err := cfgSave.SaveTo(CustomConf); err != nil {
			log.Fatal("Error saving generated INTERNAL_TOKEN to custom config: %v", err)
		}
	}
	return token
}

// NewServices initializes the services
func NewServices() {
	InitDBConfig()
	newService()
	NewLogServices(false)
	newCacheService()
	newSessionService()
	newCORSService()
	newMailService()
	newRegisterMailService()
	newNotifyMailService()
	newWebhookService()
	newMigrationsService()
	newIndexerService()
	newTaskService()
	NewQueueService()
	newProject()
}