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server.go
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server.go
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package oauth2cli
import (
"context"
"errors"
"fmt"
"net"
"net/http"
"strings"
"sync"
"time"
"github.com/shantanubansal/kubelogin/listener"
"golang.org/x/sync/errgroup"
)
func receiveCodeViaLocalServer(ctx context.Context, c *Config) (string, error) {
l, err := listener.New(c.LocalServerBindAddress)
if err != nil {
return "", fmt.Errorf("could not start a local server: %w", err)
}
defer l.Close()
c.Logf("lets check the port", l.Addr().(*net.TCPAddr).Port)
ShellySavePort(c.State, l.Addr().(*net.TCPAddr).Port, c)
c.OAuth2Config.RedirectURL = computeRedirectURL(l, c)
respCh := make(chan *authorizationResponse)
server := http.Server{
Handler: c.LocalServerMiddleware(&localServerHandler{
config: c,
respCh: respCh,
}),
}
shutdownCh := make(chan struct{})
var resp *authorizationResponse
var eg errgroup.Group
eg.Go(func() error {
defer close(respCh)
c.Logf("oauth2cli: starting a server at %s", l.Addr())
defer c.Logf("oauth2cli: stopped the server")
if c.isLocalServerHTTPS() {
if err := server.ServeTLS(l, c.LocalServerCertFile, c.LocalServerKeyFile); err != nil && err != http.ErrServerClosed {
return fmt.Errorf("could not start HTTPS server: %w", err)
}
return nil
}
if err := server.Serve(l); err != nil && err != http.ErrServerClosed {
return fmt.Errorf("could not start HTTP server: %w", err)
}
return nil
})
eg.Go(func() error {
defer close(shutdownCh)
select {
case gotResp, ok := <-respCh:
if ok {
resp = gotResp
}
return nil
case <-ctx.Done():
return ctx.Err()
}
})
eg.Go(func() error {
<-shutdownCh
// Gracefully shutdown the server in the timeout.
// If the server has not started, Shutdown returns nil and this returns immediately.
// If Shutdown has failed, force-close the server.
c.Logf("oauth2cli: shutting down the server")
ctx, cancel := context.WithTimeout(ctx, 500*time.Millisecond)
defer cancel()
if err := server.Shutdown(ctx); err != nil {
c.Logf("oauth2cli: force-closing the server: shutdown failed: %s", err)
_ = server.Close()
return nil
}
return nil
})
eg.Go(func() error {
if c.LocalServerReadyChan == nil {
return nil
}
select {
case c.LocalServerReadyChan <- c.OAuth2Config.RedirectURL:
return nil
case <-ctx.Done():
return ctx.Err()
}
})
if err := eg.Wait(); err != nil {
return "", fmt.Errorf("authorization error: %w", err)
}
if resp == nil {
return "", errors.New("no authorization response")
}
return resp.code, resp.err
}
func computeRedirectURL(l net.Listener, c *Config) string {
hostPort := fmt.Sprintf("%s", c.RedirectURLHostname)
c.Logf("Appending Port")
c.Logf("Appending Port %v", l.Addr().((*net.TCPAddr)).Port)
c.Logf("Do APpend Port %v", doAppendPort(hostPort))
c.Logf("Host %v", hostPort)
if l.Addr().((*net.TCPAddr)).Port > 1 && doAppendPort(hostPort) {
hostPort = fmt.Sprintf("%s:%d", c.RedirectURLHostname, l.Addr().(*net.TCPAddr).Port)
}
hostPort = TrimHttpPrefix(hostPort)
if c.LocalServerCertFile != "" {
return "https://" + hostPort
}
return "http://" + hostPort
}
func TrimHttpPrefix(dnsHost string) string {
dnsHost = strings.Replace(dnsHost, "http://", "", -1)
dnsHost = strings.Replace(dnsHost, "https://", "", -1)
return strings.TrimSuffix(dnsHost, "/")
}
func doAppendPort(dnsHost string) bool {
if strings.Contains(dnsHost, "http://") {
return false
}
if strings.Contains(dnsHost, "https://") {
return false
}
dnsHost = TrimHttpPrefix(dnsHost)
if len(strings.Split(dnsHost, ":")) > 1 {
return false
}
return true
}
type authorizationResponse struct {
code string // non-empty if a valid code is received
err error // non-nil if an error is received or any error occurs
}
type localServerHandler struct {
config *Config
respCh chan<- *authorizationResponse // channel to send a response to
onceRespCh sync.Once // ensure send once
}
func (h *localServerHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
q := r.URL.Query()
switch {
case r.Method == "GET" && r.URL.Path == "/" && q.Get("error") != "":
h.onceRespCh.Do(func() {
h.respCh <- h.handleErrorResponse(w, r)
})
case r.Method == "GET" && r.URL.Path == "/" && q.Get("code") != "":
h.onceRespCh.Do(func() {
h.respCh <- h.handleCodeResponse(w, r)
})
case r.Method == "GET" && r.URL.Path == "/":
h.handleIndex(w, r)
default:
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.Header().Set("X-Content-Type-Options", "nosniff")
w.WriteHeader(http.StatusNotFound)
fmt.Fprintln(w, fmt.Sprintf("404 page not found - %v", r.URL.Path))
http.NotFound(w, r)
}
}
func (h *localServerHandler) handleIndex(w http.ResponseWriter, r *http.Request) {
authCodeURL := h.config.OAuth2Config.AuthCodeURL(h.config.State, h.config.AuthCodeOptions...)
h.config.Logf("oauth2cli: sending redirect to %s", authCodeURL)
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.Header().Set("X-Content-Type-Options", "nosniff")
w.Write([]byte(authCodeURL))
w.WriteHeader(http.StatusOK)
//http.Redirect(w, r, authCodeURL, 302)
//http.Redirect(w, r, authCodeURL, 302)
}
func (h *localServerHandler) handleCodeResponse(w http.ResponseWriter, r *http.Request) *authorizationResponse {
q := r.URL.Query()
code, state := q.Get("code"), q.Get("state")
if state != h.config.State {
h.authorizationError(w, r)
return &authorizationResponse{err: fmt.Errorf("state does not match (wants %s but got %s)", h.config.State, state)}
}
if h.config.SuccessRedirectURL != "" {
http.Redirect(w, r, h.config.SuccessRedirectURL, http.StatusFound)
} else {
w.Header().Add("Content-Type", "text/html")
if _, err := fmt.Fprintf(w, h.config.LocalServerSuccessHTML); err != nil {
http.Error(w, "server error", 500)
return &authorizationResponse{err: fmt.Errorf("write error: %w", err)}
}
}
return &authorizationResponse{code: code}
}
func (h *localServerHandler) handleErrorResponse(w http.ResponseWriter, r *http.Request) *authorizationResponse {
q := r.URL.Query()
errorCode, errorDescription := q.Get("error"), q.Get("error_description")
h.authorizationError(w, r)
return &authorizationResponse{err: fmt.Errorf("authorization error from server: %s %s", errorCode, errorDescription)}
}
func (h *localServerHandler) authorizationError(w http.ResponseWriter, r *http.Request) {
if h.config.FailureRedirectURL != "" {
http.Redirect(w, r, h.config.FailureRedirectURL, http.StatusFound)
} else {
http.Error(w, "authorization error", 500)
}
}