dsh
1b81e5ccf8
- ip_family 默认 ipv4（保持 PTR/SPF 最可靠的路径）；运营商为静态 IPv6 配置 PTR 后可切换 ipv6 - source_ip 绑定出站源地址，避免内核使用轮换的 IPv6 临时隐私地址 （临时地址无 PTR，Gmail 等会拒收） - 无 MX 回退时按地址族偏好排序 A/AAAA
353 lines
11 KiB
Go
353 lines
11 KiB
Go
package config
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import (
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"fmt"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/BurntSushi/toml"
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)
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// DatabaseConfig holds database connection settings.
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type DatabaseConfig struct {
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Driver string `toml:"driver"`
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DSN string `toml:"dsn"`
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}
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// StorageConfig holds file storage paths.
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type StorageConfig struct {
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BaseDir string `toml:"base_dir"`
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AttachDir string `toml:"attach_dir"`
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}
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// WebConfig holds web server settings.
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type WebConfig struct {
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Addr string `toml:"addr"`
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}
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// SMTPConfig holds SMTP server settings.
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type SMTPConfig struct {
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Addr string `toml:"addr"`
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TLSAddr string `toml:"tls_addr"`
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SubmissionAddr string `toml:"submission_addr"`
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Domain string `toml:"domain"`
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TLSCert string `toml:"tls_cert"`
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TLSKey string `toml:"tls_key"`
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MaxMessage int64 `toml:"max_message_bytes"`
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}
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// IMAPConfig holds IMAP server settings.
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type IMAPConfig struct {
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Addr string `toml:"addr"`
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TLSAddr string `toml:"tls_addr"`
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TLSCert string `toml:"tls_cert"`
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TLSKey string `toml:"tls_key"`
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}
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// POP3Config holds POP3 server settings.
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type POP3Config struct {
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Addr string `toml:"addr"`
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TLSAddr string `toml:"tls_addr"`
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TLSCert string `toml:"tls_cert"`
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TLSKey string `toml:"tls_key"`
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}
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// AuthConfig holds external authentication settings (OAuth2, LDAP).
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type AuthConfig struct {
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// OAuth2 configuration
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OAuth2Enabled bool `toml:"oauth2_enabled"`
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OAuth2Provider string `toml:"oauth2_provider"` // google, github, gitlab
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OAuth2ClientID string `toml:"oauth2_client_id"`
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OAuth2ClientSecret string `toml:"oauth2_client_secret"`
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OAuth2RedirectURL string `toml:"oauth2_redirect_url"`
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// LDAP configuration
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LDAPEnabled bool `toml:"ldap_enabled"`
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LDAPServer string `toml:"ldap_server"` // e.g. ldap://localhost:389
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LDAPBindDN string `toml:"ldap_bind_dn"` // e.g. cn=admin,dc=example,dc=com
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LDAPBindPassword string `toml:"ldap_bind_password"`
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LDAPSearchBase string `toml:"ldap_search_base"` // e.g. ou=users,dc=example,dc=com
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LDAPSearchFilter string `toml:"ldap_search_filter"` // e.g. (uid=%s)
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LDAPUseTLS bool `toml:"ldap_use_tls"`
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}
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// BanConfig holds IP ban settings for failed login attempts.
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type BanConfig struct {
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MaxFailAttempts int `toml:"max_fail_attempts"` // Default: 5
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BanDurationMin int `toml:"ban_duration_min"` // Default: 30 (minutes)
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}
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// OutboundConfig holds outbound (external) mail delivery settings.
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type OutboundConfig struct {
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Hostname string `toml:"hostname"` // EHLO 主机名，留空使用 [smtp] domain
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PollInterval int `toml:"poll_interval"` // 队列扫描间隔（秒）
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MaxAttempts int `toml:"max_attempts"` // 单封邮件最大投递尝试次数
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RetryBaseMin int `toml:"retry_base_min"` // 重试退避基数（分钟），指数增长
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MaxRecipients int `toml:"max_recipients"` // 单封邮件最大外部收件人数
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MaxPerMin int `toml:"max_per_min"` // 每用户每分钟最大外发数
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MaxPerDay int `toml:"max_per_day"` // 每用户每日最大外发数，0 表示禁用外部投递
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ConnectTimeout int `toml:"connect_timeout"` // 连接远程 MX 超时（秒）
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// Smarthost relay: when relay_host is non-empty, all external mail is
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// delivered through this relay instead of direct MX delivery. Useful when
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// the server IP is listed in PBL/blocklists (residential/dynamic IPs).
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RelayHost string `toml:"relay_host"` // 中继服务器地址，留空则直投 MX
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RelayPort int `toml:"relay_port"` // 465 = 隐式 TLS，其他端口先尝试 STARTTLS
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RelayUser string `toml:"relay_user"` // 中继认证用户名（AUTH PLAIN）
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RelayPassword string `toml:"relay_password"` // 中继认证密码
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RelayStartTLS bool `toml:"relay_starttls"` // 非 465 端口是否使用 STARTTLS
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// IP family and source address binding for outbound connections.
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IPFamily string `toml:"ip_family"` // ipv4（默认，PTR/SPF 最可靠）| ipv6 | auto
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SourceIP string `toml:"source_ip"` // 出站源地址绑定（如静态 IPv6），留空由内核选择
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}
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// Config is the top-level configuration structure.
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type Config struct {
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Database DatabaseConfig `toml:"database"`
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Storage StorageConfig `toml:"storage"`
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Web WebConfig `toml:"web"`
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SMTP SMTPConfig `toml:"smtp"`
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IMAP IMAPConfig `toml:"imap"`
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POP3 POP3Config `toml:"pop3"`
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Auth AuthConfig `toml:"auth"`
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Ban BanConfig `toml:"ban"`
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Outbound OutboundConfig `toml:"outbound"`
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}
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// isWindows returns true if the current OS is Windows.
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func isWindows() bool {
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return runtime.GOOS == "windows"
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}
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// etcDir returns the etc directory based on the current OS.
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func etcDir() string {
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if isWindows() {
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return WinEtcDir
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}
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return LinuxEtcDir
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}
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// baseDir returns the base data directory based on the current OS.
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func baseDir() string {
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if isWindows() {
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return WinBaseDir
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}
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return LinuxBaseDir
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}
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// defaultDSN returns the default database DSN based on the current OS.
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func defaultDSN() string {
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if isWindows() {
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return DefaultDSNWin
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}
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return DefaultDSNLinux
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}
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// defaultConfig returns a fully populated Config with default values.
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func defaultConfig() *Config {
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bd := baseDir()
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return &Config{
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Database: DatabaseConfig{
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Driver: DefaultDBDriver,
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DSN: defaultDSN(),
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},
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Storage: StorageConfig{
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BaseDir: bd,
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AttachDir: filepath.Join(bd, "attachments"),
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},
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Web: WebConfig{
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Addr: DefaultWebPort,
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},
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SMTP: SMTPConfig{
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Addr: fmt.Sprintf(":%d", DefaultSMTPPort),
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TLSAddr: fmt.Sprintf(":%d", DefaultSMTPTLSPort),
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SubmissionAddr: fmt.Sprintf(":%d", DefaultSMTPSubmitPort),
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Domain: "localhost",
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MaxMessage: 64 * 1024 * 1024, // 64MB
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},
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IMAP: IMAPConfig{
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Addr: fmt.Sprintf(":%d", DefaultIMAPPort),
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TLSAddr: fmt.Sprintf(":%d", DefaultIMAPTLSPort),
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},
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POP3: POP3Config{
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Addr: fmt.Sprintf(":%d", DefaultPOP3Port),
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TLSAddr: fmt.Sprintf(":%d", DefaultPOP3TLSPort),
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},
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Auth: AuthConfig{
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OAuth2Enabled: false,
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LDAPEnabled: false,
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},
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Ban: BanConfig{
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MaxFailAttempts: 5,
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BanDurationMin: 30,
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},
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Outbound: OutboundConfig{
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PollInterval: 15, // 15 秒扫描一次队列
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MaxAttempts: 12, // 最多尝试 12 次
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RetryBaseMin: 5, // 5/10/20/40/... 分钟指数退避
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MaxRecipients: 50, // 单封最多 50 个外部收件人
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MaxPerMin: 30, // 每用户每分钟 30 封
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MaxPerDay: 500,
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ConnectTimeout: 30, // 连接远程 MX 超时 30 秒
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RelayPort: 587, // smarthost 默认提交端口
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RelayStartTLS: true,
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IPFamily: "ipv4",
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},
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}
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}
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// configFilePath returns the full path to the configuration file.
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func configFilePath() string {
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return filepath.Join(etcDir(), ConfigFileName)
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}
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// mergeDefaults overlays default values onto the loaded config for any zero/empty fields.
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func mergeDefaults(cfg *Config, defaults *Config) *Config {
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if cfg.Database.Driver == "" {
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cfg.Database.Driver = defaults.Database.Driver
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}
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if cfg.Database.DSN == "" {
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cfg.Database.DSN = defaults.Database.DSN
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}
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if cfg.Storage.BaseDir == "" {
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cfg.Storage.BaseDir = defaults.Storage.BaseDir
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}
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if cfg.Storage.AttachDir == "" {
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cfg.Storage.AttachDir = defaults.Storage.AttachDir
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}
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if cfg.Web.Addr == "" {
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cfg.Web.Addr = defaults.Web.Addr
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}
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if cfg.SMTP.Addr == "" {
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cfg.SMTP.Addr = defaults.SMTP.Addr
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}
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if cfg.SMTP.TLSAddr == "" {
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cfg.SMTP.TLSAddr = defaults.SMTP.TLSAddr
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}
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if cfg.SMTP.SubmissionAddr == "" {
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cfg.SMTP.SubmissionAddr = defaults.SMTP.SubmissionAddr
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}
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if cfg.SMTP.Domain == "" {
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cfg.SMTP.Domain = defaults.SMTP.Domain
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}
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if cfg.SMTP.MaxMessage == 0 {
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cfg.SMTP.MaxMessage = defaults.SMTP.MaxMessage
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}
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if cfg.IMAP.Addr == "" {
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cfg.IMAP.Addr = defaults.IMAP.Addr
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}
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if cfg.IMAP.TLSAddr == "" {
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cfg.IMAP.TLSAddr = defaults.IMAP.TLSAddr
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}
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if cfg.POP3.Addr == "" {
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cfg.POP3.Addr = defaults.POP3.Addr
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}
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if cfg.POP3.TLSAddr == "" {
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cfg.POP3.TLSAddr = defaults.POP3.TLSAddr
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}
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// Auth defaults: no merging needed since booleans default to false
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// and string fields are intentionally empty when disabled
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if cfg.Ban.MaxFailAttempts == 0 {
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cfg.Ban.MaxFailAttempts = defaults.Ban.MaxFailAttempts
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}
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if cfg.Ban.BanDurationMin == 0 {
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cfg.Ban.BanDurationMin = defaults.Ban.BanDurationMin
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}
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if cfg.Outbound.PollInterval == 0 {
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cfg.Outbound.PollInterval = defaults.Outbound.PollInterval
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}
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if cfg.Outbound.MaxAttempts == 0 {
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cfg.Outbound.MaxAttempts = defaults.Outbound.MaxAttempts
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}
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if cfg.Outbound.RetryBaseMin == 0 {
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cfg.Outbound.RetryBaseMin = defaults.Outbound.RetryBaseMin
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}
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if cfg.Outbound.MaxRecipients == 0 {
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cfg.Outbound.MaxRecipients = defaults.Outbound.MaxRecipients
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}
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if cfg.Outbound.MaxPerMin == 0 {
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cfg.Outbound.MaxPerMin = defaults.Outbound.MaxPerMin
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}
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if cfg.Outbound.MaxPerDay == 0 {
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cfg.Outbound.MaxPerDay = defaults.Outbound.MaxPerDay
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}
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if cfg.Outbound.ConnectTimeout == 0 {
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cfg.Outbound.ConnectTimeout = defaults.Outbound.ConnectTimeout
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}
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if cfg.Outbound.RelayPort == 0 {
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cfg.Outbound.RelayPort = defaults.Outbound.RelayPort
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}
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if cfg.Outbound.IPFamily == "" {
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cfg.Outbound.IPFamily = defaults.Outbound.IPFamily
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}
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return cfg
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}
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// writeConfig writes the configuration to the given file path.
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// It creates the parent directories if they don't exist.
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func writeConfig(path string, cfg *Config) error {
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dir := filepath.Dir(path)
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if err := os.MkdirAll(dir, 0755); err != nil {
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return fmt.Errorf("创建配置目录失败 %s: %w", dir, err)
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}
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f, err := os.Create(path)
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if err != nil {
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return fmt.Errorf("创建配置文件失败 %s: %w", path, err)
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}
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defer f.Close()
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enc := toml.NewEncoder(f)
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if err := enc.Encode(cfg); err != nil {
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return fmt.Errorf("写入配置文件失败: %w", err)
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}
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return nil
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}
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// LoadConfig loads the configuration from disk.
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// If the configuration file does not exist, it creates one with default values.
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// If the file exists but has missing fields, they are filled with defaults and the file is updated.
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func LoadConfig() (*Config, error) {
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path := configFilePath()
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defaults := defaultConfig()
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// If config file doesn't exist, create it with defaults
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if _, err := os.Stat(path); os.IsNotExist(err) {
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if mkErr := writeConfig(path, defaults); mkErr != nil {
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return nil, mkErr
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}
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return defaults, nil
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}
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// Read existing config file
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data, err := os.ReadFile(path)
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if err != nil {
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return nil, fmt.Errorf("读取配置文件失败 %s: %w", path, err)
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}
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cfg := &Config{}
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if err := toml.Unmarshal(data, cfg); err != nil {
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return nil, fmt.Errorf("解析配置文件失败: %w", err)
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}
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// relay_starttls defaults to true for safety; the raw file is checked
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// because TOML decoding cannot distinguish an absent bool from false.
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if !strings.Contains(string(data), "relay_starttls") {
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cfg.Outbound.RelayStartTLS = defaults.Outbound.RelayStartTLS
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}
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// Merge defaults for any missing fields
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merged := mergeDefaults(cfg, defaults)
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// Write back if any fields were filled in from defaults
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// (always write back to ensure the file has all fields)
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if writeErr := writeConfig(path, merged); writeErr != nil {
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return nil, writeErr
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}
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return merged, nil
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}
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