mirror of
https://github.com/openziti/zrok.git
synced 2024-11-07 08:44:14 +01:00
102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
package proxy
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import (
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"crypto/tls"
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"fmt"
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"github.com/openziti/sdk-golang/ziti"
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"github.com/openziti/sdk-golang/ziti/edge"
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"github.com/openziti/zrok/endpoints"
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"github.com/openziti/zrok/util"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"net/http"
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"net/http/httputil"
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"net/url"
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"time"
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)
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type BackendConfig struct {
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IdentityPath string
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EndpointAddress string
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ShrToken string
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Insecure bool
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Requests chan *endpoints.Request
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}
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type Backend struct {
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cfg *BackendConfig
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listener edge.Listener
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handler http.Handler
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}
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func NewBackend(cfg *BackendConfig) (*Backend, error) {
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options := ziti.ListenOptions{
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ConnectTimeout: 5 * time.Minute,
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WaitForNEstablishedListeners: 1,
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}
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zcfg, err := ziti.NewConfigFromFile(cfg.IdentityPath)
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if err != nil {
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return nil, errors.Wrap(err, "error loading config")
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}
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zctx, err := ziti.NewContext(zcfg)
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if err != nil {
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return nil, errors.Wrap(err, "error loading ziti context")
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}
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listener, err := zctx.ListenWithOptions(cfg.ShrToken, &options)
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if err != nil {
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return nil, errors.Wrap(err, "error listening")
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}
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proxy, err := newReverseProxy(cfg)
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if err != nil {
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return nil, err
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}
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handler := util.NewProxyHandler(proxy)
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return &Backend{
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cfg: cfg,
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listener: listener,
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handler: handler,
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}, nil
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}
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func (b *Backend) Run() error {
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if err := http.Serve(b.listener, b.handler); err != nil {
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return err
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}
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return nil
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}
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func newReverseProxy(cfg *BackendConfig) (*httputil.ReverseProxy, error) {
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targetURL, err := url.Parse(cfg.EndpointAddress)
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if err != nil {
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return nil, err
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}
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tpt := http.DefaultTransport.(*http.Transport).Clone()
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if cfg.Insecure {
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tpt.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
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}
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proxy := httputil.NewSingleHostReverseProxy(targetURL)
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proxy.Transport = tpt
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director := proxy.Director
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proxy.Director = func(req *http.Request) {
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if cfg.Requests != nil {
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cfg.Requests <- &endpoints.Request{
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Stamp: time.Now(),
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RemoteAddr: fmt.Sprintf("%v", req.Header["X-Real-Ip"]),
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Method: req.Method,
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Path: req.URL.String(),
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}
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}
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director(req)
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req.Header.Set("X-Proxy", "zrok")
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}
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proxy.ErrorHandler = func(w http.ResponseWriter, r *http.Request, err error) {
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logrus.Errorf("error proxying: %v", err)
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}
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return proxy, nil
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}
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