source: code/trunk/config/config.go@ 725

package config

import (
        "fmt"
        "net"
        "os"
        "strconv"

        "git.sr.ht/~emersion/go-scfg"
)

type IPSet []*net.IPNet

func (set IPSet) Contains(ip net.IP) bool {
        for _, n := range set {
                if n.Contains(ip) {
                        return true
                }
        }
        return false
}

// loopbackIPs contains the loopback networks 127.0.0.0/8 and ::1/128.
var loopbackIPs = IPSet{
        &net.IPNet{
                IP:   net.IP{127, 0, 0, 0},
                Mask: net.CIDRMask(8, 32),
        },
        &net.IPNet{
                IP:   net.IPv6loopback,
                Mask: net.CIDRMask(128, 128),
        },
}

type TLS struct {
        CertPath, KeyPath string
}

type Server struct {
        Listen   []string
        TLS      *TLS
        Hostname string
        Title    string
        MOTDPath string

        SQLDriver string
        SQLSource string
        LogPath   string

        HTTPOrigins    []string
        AcceptProxyIPs IPSet

        MaxUserNetworks int
        MultiUpstream   bool
        UpstreamUserIPs []*net.IPNet
}

func Defaults() *Server {
        hostname, err := os.Hostname()
        if err != nil {
                hostname = "localhost"
        }
        return &Server{
                Hostname:        hostname,
                SQLDriver:       "sqlite3",
                SQLSource:       "soju.db",
                MaxUserNetworks: -1,
                MultiUpstream:   true,
        }
}

func Load(path string) (*Server, error) {
        cfg, err := scfg.Load(path)
        if err != nil {
                return nil, err
        }
        return parse(cfg)
}

func parse(cfg scfg.Block) (*Server, error) {
        srv := Defaults()
        for _, d := range cfg {
                switch d.Name {
                case "listen":
                        var uri string
                        if err := d.ParseParams(&uri); err != nil {
                                return nil, err
                        }
                        srv.Listen = append(srv.Listen, uri)
                case "hostname":
                        if err := d.ParseParams(&srv.Hostname); err != nil {
                                return nil, err
                        }
                case "title":
                        if err := d.ParseParams(&srv.Title); err != nil {
                                return nil, err
                        }
                case "motd":
                        if err := d.ParseParams(&srv.MOTDPath); err != nil {
                                return nil, err
                        }
                case "tls":
                        tls := &TLS{}
                        if err := d.ParseParams(&tls.CertPath, &tls.KeyPath); err != nil {
                                return nil, err
                        }
                        srv.TLS = tls
                case "db":
                        if err := d.ParseParams(&srv.SQLDriver, &srv.SQLSource); err != nil {
                                return nil, err
                        }
                case "log":
                        var driver string
                        if err := d.ParseParams(&driver, &srv.LogPath); err != nil {
                                return nil, err
                        }
                        if driver != "fs" {
                                return nil, fmt.Errorf("directive %q: unknown driver %q", d.Name, driver)
                        }
                case "http-origin":
                        srv.HTTPOrigins = d.Params
                case "accept-proxy-ip":
                        srv.AcceptProxyIPs = nil
                        for _, s := range d.Params {
                                if s == "localhost" {
                                        srv.AcceptProxyIPs = append(srv.AcceptProxyIPs, loopbackIPs...)
                                        continue
                                }
                                _, n, err := net.ParseCIDR(s)
                                if err != nil {
                                        return nil, fmt.Errorf("directive %q: failed to parse CIDR: %v", d.Name, err)
                                }
                                srv.AcceptProxyIPs = append(srv.AcceptProxyIPs, n)
                        }
                case "max-user-networks":
                        var max string
                        if err := d.ParseParams(&max); err != nil {
                                return nil, err
                        }
                        var err error
                        if srv.MaxUserNetworks, err = strconv.Atoi(max); err != nil {
                                return nil, fmt.Errorf("directive %q: %v", d.Name, err)
                        }
                case "multi-upstream-mode":
                        var str string
                        if err := d.ParseParams(&str); err != nil {
                                return nil, err
                        }
                        v, err := strconv.ParseBool(str)
                        if err != nil {
                                return nil, fmt.Errorf("directive %q: %v", d.Name, err)
                        }
                        srv.MultiUpstream = v
                case "upstream-user-ip":
                        if len(srv.UpstreamUserIPs) > 0 {
                                return nil, fmt.Errorf("directive %q: can only be specified once", d.Name)
                        }
                        var hasIPv4, hasIPv6 bool
                        for _, s := range d.Params {
                                _, n, err := net.ParseCIDR(s)
                                if err != nil {
                                        return nil, fmt.Errorf("directive %q: failed to parse CIDR: %v", d.Name, err)
                                }
                                if n.IP.To4() == nil {
                                        if hasIPv6 {
                                                return nil, fmt.Errorf("directive %q: found two IPv6 CIDRs", d.Name)
                                        }
                                        hasIPv6 = true
                                } else {
                                        if hasIPv4 {
                                                return nil, fmt.Errorf("directive %q: found two IPv4 CIDRs", d.Name)
                                        }
                                        hasIPv4 = true
                                }
                                srv.UpstreamUserIPs = append(srv.UpstreamUserIPs, n)
                        }
                default:
                        return nil, fmt.Errorf("unknown directive %q", d.Name)
                }
        }

        return srv, nil
}