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package goxy

import (
	"crypto/tls"
	"encoding/json"
	"errors"
	"os"
)

// Route defines a set of routes including correspondent TLS certificates
type Route map[string]Entry

// GetCertificate returns certificate for SNI negotiation
func (r Route) GetCertificate(h *tls.ClientHelloInfo) (*tls.Certificate, error) {
	if e, ok := r[h.ServerName]; ok && e.cert != nil {
		return e.cert, nil
	}
	return nil, errors.New("no cert for " + h.ServerName)
}

// Save routes to persistent file
func (r Route) Save(fname string) error {
	fd, err := os.Create(fname)
	if err != nil {
		return err
	}
	defer fd.Close()
	return json.NewEncoder(fd).Encode(r)
}

// Load routes from persistent file
func (r *Route) Load(fname string) error {
	fd, err := os.Open(fname)
	if err != nil {
		return err
	}
	defer fd.Close()
	return json.NewDecoder(fd).Decode(r)
}

// Entry holds routing settings
type Entry struct {
	Host     string           // HostName
	Upstream string           // URL
	Cert     []byte           // PEM
	Key      []byte           // PEM
	cert     *tls.Certificate // Parsed
}

func (e Entry) String() string {
	ret := e.Host + " → " + e.Upstream
	if e.cert != nil {
		ret += " with TLS"
	}
	return ret
}