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tokenrequest: add support for authorization code flow with proof key …
…for code exchange
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package tokenrequest | ||
|
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| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "net" | ||
| "net/http" | ||
| "strconv" | ||
|
|
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| "k8s.io/klog/v2" | ||
| ) | ||
|
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| type callbackResult struct { | ||
| token string | ||
| err error | ||
| } | ||
|
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| type callbackHandlerFunc func(*http.Request) (string, error) | ||
|
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| type callbackServer struct { | ||
| server *http.Server | ||
| tcpListener net.Listener | ||
| listenAddr *net.TCPAddr | ||
|
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| // the channel to deliver the access token or error | ||
| resultChan chan callbackResult | ||
|
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| // function to call when the callback redirect is received; this should be | ||
| // used to request an access token based on the received callback | ||
| callbackHandler callbackHandlerFunc | ||
| } | ||
|
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| func newCallbackServer(port int) (*callbackServer, error) { | ||
| callbackServer := &callbackServer{ | ||
| resultChan: make(chan callbackResult, 1), | ||
| } | ||
|
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| loopbackAddr, err := getLoopbackAddr() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| callbackServer.tcpListener, err = net.Listen("tcp", net.JoinHostPort(loopbackAddr, strconv.Itoa(port))) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| listenAddr, ok := callbackServer.tcpListener.Addr().(*net.TCPAddr) | ||
| if !ok { | ||
| return nil, fmt.Errorf("listener is not of TCP type: %v", callbackServer.tcpListener.Addr()) | ||
| } | ||
| callbackServer.listenAddr = listenAddr | ||
|
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| mux := http.NewServeMux() | ||
| mux.Handle("/callback", callbackServer) | ||
|
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| callbackServer.server = &http.Server{ | ||
| Handler: mux, | ||
| } | ||
|
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| return callbackServer, nil | ||
| } | ||
|
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| func (c *callbackServer) ListenAddr() *net.TCPAddr { | ||
| return c.listenAddr | ||
| } | ||
|
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| func (c *callbackServer) SetCallbackHandler(callbackHandler callbackHandlerFunc) { | ||
| c.callbackHandler = callbackHandler | ||
| } | ||
|
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| func (c *callbackServer) Start() { | ||
| err := c.server.Serve(c.tcpListener) | ||
| if err != nil && err != http.ErrServerClosed { | ||
| klog.V(4).Infof("callback server failed: %v", err) | ||
| c.resultChan <- callbackResult{err: err} | ||
| } | ||
|
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| close(c.resultChan) | ||
| } | ||
|
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| func (c *callbackServer) Shutdown(ctx context.Context) { | ||
| err := c.server.Shutdown(ctx) | ||
| if err != nil { | ||
| klog.V(4).Infof("failed to shutdown callback server: %v", err) | ||
| } | ||
| } | ||
|
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| func (c *callbackServer) ServeHTTP(w http.ResponseWriter, r *http.Request) { | ||
| if c.callbackHandler == nil { | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| w.Write([]byte("access token request failed; please return to your terminal")) | ||
| c.resultChan <- callbackResult{err: fmt.Errorf("no callback handler set")} | ||
| return | ||
| } | ||
|
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| token, err := c.callbackHandler(r) | ||
| if err != nil { | ||
| w.WriteHeader(http.StatusBadRequest) | ||
| w.Write([]byte("access token request failed; please return to your terminal")) | ||
| c.resultChan <- callbackResult{err: err} | ||
| return | ||
| } | ||
|
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| w.Write([]byte("access token received successfully; please return to your terminal")) | ||
| c.resultChan <- callbackResult{token: token} | ||
| } | ||
|
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| // getLoopbackAddr returns the first address from the host's network interfaces which is a loopback address | ||
| func getLoopbackAddr() (string, error) { | ||
| interfaces, err := net.InterfaceAddrs() | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| for _, iface := range interfaces { | ||
| if ipaddr, ok := iface.(*net.IPNet); ok { | ||
| if ipaddr.IP.IsLoopback() { | ||
| return ipaddr.IP.String(), nil | ||
| } | ||
| } | ||
| } | ||
|
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||
| return "", errors.New("no loopback network interfaces found") | ||
| } |
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