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path: root/route.go
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package goxy

import (
	"crypto/tls"
	"errors"
	"fmt"
	"net/http"
	"net/url"
)

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

type Route struct {
	ServerName  *url.URL
	Upstream    *url.URL
	Certificate *tls.Certificate
}

func (r Route) String() string {
	return fmt.Sprintf("%v → %v", r.ServerName, r.Upstream)
}

// GetCertificate returns certificate for SNI negotiation
func (r Routes) GetCertificate(h *tls.ClientHelloInfo) (*tls.Certificate, error) {
	host := h.ServerName
	if v, ok := r[host]; ok && v.Certificate != nil {
		return v.Certificate, nil
	}
	// HACK search for certs with port speciefied
	for k, v := range r {
		if k[:len(host)] == host {
			return v.Certificate, nil
		}
	}
	return nil, errors.New("no cert for " + host)
}

func (r Routes) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
	for _, v := range r {
		fmt.Fprintln(w, v)
	}
}

func NewRoute(e Entry) (Route, error) {
	fail := func(err error) (Route, error) { return Route{}, err }
	host, err := url.Parse(e.Host)
	if err != nil {
		return fail(err)
	}
	up, err := url.Parse(e.Upstream)
	if err != nil {
		return fail(err)
	}
	if host.Host == "" || up.Host == "" {
		return fail(ErrNoHost)
	}
	if host.Path == "" {
		host.Path = "/"
	}
	r := Route{ServerName: host, Upstream: up}
	if host.Scheme == "https" {
		if e.Cert == nil || e.Key == nil {
			return fail(ErrNoCert)
		}
		cert, err := tls.X509KeyPair(e.Cert, e.Key)
		if err != nil {
			return fail(err)
		}
		r.Certificate = &cert
	}
	return r, nil
}