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paramtoken.go
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paramtoken.go
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package paramtoken
import (
"net/http"
"regexp"
"strings"
"github.com/openshift/origin/pkg/auth/authenticator"
"k8s.io/kubernetes/pkg/auth/user"
)
// Authenticator provides a way to authenticate tokens provided as a parameter
// This only exists to allow websocket connections to use an API token, since they cannot set an Authorize header
// For this authenticator to work, tokens will be part of the request URL, and are more likely to be logged or otherwise exposed.
// Every effort should be made to filter tokens from being logged when using this authenticator.
type Authenticator struct {
// param is the query param to use as a token
param string
// auth is the token authenticator to use to validate the token
auth authenticator.Token
// removeParam indicates whether the parameter should be stripped from the incoming request
removeParam bool
}
func New(param string, auth authenticator.Token, removeParam bool) *Authenticator {
return &Authenticator{param, auth, removeParam}
}
func (a *Authenticator) AuthenticateRequest(req *http.Request) (user.Info, bool, error) {
// Only accept query param auth for websocket connections
if !isWebSocketRequest(req) {
return nil, false, nil
}
q := req.URL.Query()
token := strings.TrimSpace(q.Get(a.param))
if token == "" {
return nil, false, nil
}
user, ok, err := a.auth.AuthenticateToken(token)
if ok && a.removeParam {
q.Del(a.param)
req.URL.RawQuery = q.Encode()
}
return user, ok, err
}
var (
// connectionUpgradeRegex matches any Connection header value that includes upgrade
connectionUpgradeRegex = regexp.MustCompile("(^|.*,\\s*)upgrade($|\\s*,)")
)
// isWebSocketRequest returns true if the incoming request contains connection upgrade headers for WebSockets.
func isWebSocketRequest(req *http.Request) bool {
return connectionUpgradeRegex.MatchString(strings.ToLower(req.Header.Get("Connection"))) && strings.ToLower(req.Header.Get("Upgrade")) == "websocket"
}