Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

application/migrator/conf/conf.go

@@ -0,0 +1,124 @@
+package conf
+
+import (
+	"github.com/cloudreve/Cloudreve/v4/pkg/logging"
+	"github.com/go-ini/ini"
+	"github.com/go-playground/validator/v10"
+)
+
+// database 数据库
+type database struct {
+	Type        string
+	User        string
+	Password    string
+	Host        string
+	Name        string
+	TablePrefix string
+	DBFile      string
+	Port        int
+	Charset     string
+	UnixSocket  bool
+}
+
+// system 系统通用配置
+type system struct {
+	Mode          string `validate:"eq=master|eq=slave"`
+	Listen        string `validate:"required"`
+	Debug         bool
+	SessionSecret string
+	HashIDSalt    string
+	GracePeriod   int    `validate:"gte=0"`
+	ProxyHeader   string `validate:"required_with=Listen"`
+}
+
+type ssl struct {
+	CertPath string `validate:"omitempty,required"`
+	KeyPath  string `validate:"omitempty,required"`
+	Listen   string `validate:"required"`
+}
+
+type unix struct {
+	Listen string
+	Perm   uint32
+}
+
+// slave 作为slave存储端配置
+type slave struct {
+	Secret          string `validate:"omitempty,gte=64"`
+	CallbackTimeout int    `validate:"omitempty,gte=1"`
+	SignatureTTL    int    `validate:"omitempty,gte=1"`
+}
+
+// redis 配置
+type redis struct {
+	Network  string
+	Server   string
+	User     string
+	Password string
+	DB       string
+}
+
+// 跨域配置
+type cors struct {
+	AllowOrigins     []string
+	AllowMethods     []string
+	AllowHeaders     []string
+	AllowCredentials bool
+	ExposeHeaders    []string
+	SameSite         string
+	Secure           bool
+}
+
+var cfg *ini.File
+
+// Init 初始化配置文件
+func Init(l logging.Logger, path string) error {
+	var err error
+
+	cfg, err = ini.Load(path)
+	if err != nil {
+		l.Error("Failed to parse config file %q: %s", path, err)
+		return err
+	}
+
+	sections := map[string]interface{}{
+		"Database":   DatabaseConfig,
+		"System":     SystemConfig,
+		"SSL":        SSLConfig,
+		"UnixSocket": UnixConfig,
+		"Redis":      RedisConfig,
+		"CORS":       CORSConfig,
+		"Slave":      SlaveConfig,
+	}
+	for sectionName, sectionStruct := range sections {
+		err = mapSection(sectionName, sectionStruct)
+		if err != nil {
+			l.Error("Failed to parse config section %q: %s", sectionName, err)
+			return err
+		}
+	}
+
+	// 映射数据库配置覆盖
+	for _, key := range cfg.Section("OptionOverwrite").Keys() {
+		OptionOverwrite[key.Name()] = key.Value()
+	}
+
+	return nil
+}
+
+// mapSection 将配置文件的 Section 映射到结构体上
+func mapSection(section string, confStruct interface{}) error {
+	err := cfg.Section(section).MapTo(confStruct)
+	if err != nil {
+		return err
+	}
+
+	// 验证合法性
+	validate := validator.New()
+	err = validate.Struct(confStruct)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}