mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-13 09:04:06 -08:00
532 lines
15 KiB
Go
532 lines
15 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package transport
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import (
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"fmt"
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"net/http"
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"strings"
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"time"
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"k8s.io/klog"
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utilnet "k8s.io/apimachinery/pkg/util/net"
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)
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// HTTPWrappersForConfig wraps a round tripper with any relevant layered
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// behavior from the config. Exposed to allow more clients that need HTTP-like
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// behavior but then must hijack the underlying connection (like WebSocket or
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// HTTP2 clients). Pure HTTP clients should use the RoundTripper returned from
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// New.
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func HTTPWrappersForConfig(config *Config, rt http.RoundTripper) (http.RoundTripper, error) {
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if config.WrapTransport != nil {
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rt = config.WrapTransport(rt)
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}
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rt = DebugWrappers(rt)
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// Set authentication wrappers
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switch {
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case config.HasBasicAuth() && config.HasTokenAuth():
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return nil, fmt.Errorf("username/password or bearer token may be set, but not both")
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case config.HasTokenAuth():
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rt = NewBearerAuthRoundTripper(config.BearerToken, rt)
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case config.HasBasicAuth():
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rt = NewBasicAuthRoundTripper(config.Username, config.Password, rt)
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}
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if len(config.UserAgent) > 0 {
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rt = NewUserAgentRoundTripper(config.UserAgent, rt)
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}
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if len(config.Impersonate.UserName) > 0 ||
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len(config.Impersonate.Groups) > 0 ||
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len(config.Impersonate.Extra) > 0 {
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rt = NewImpersonatingRoundTripper(config.Impersonate, rt)
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}
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return rt, nil
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}
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// DebugWrappers wraps a round tripper and logs based on the current log level.
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func DebugWrappers(rt http.RoundTripper) http.RoundTripper {
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switch {
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case bool(klog.V(9)):
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rt = newDebuggingRoundTripper(rt, debugCurlCommand, debugURLTiming, debugResponseHeaders)
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case bool(klog.V(8)):
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rt = newDebuggingRoundTripper(rt, debugJustURL, debugRequestHeaders, debugResponseStatus, debugResponseHeaders)
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case bool(klog.V(7)):
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rt = newDebuggingRoundTripper(rt, debugJustURL, debugRequestHeaders, debugResponseStatus)
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case bool(klog.V(6)):
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rt = newDebuggingRoundTripper(rt, debugURLTiming)
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}
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return rt
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}
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type requestCanceler interface {
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CancelRequest(*http.Request)
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}
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type authProxyRoundTripper struct {
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username string
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groups []string
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extra map[string][]string
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rt http.RoundTripper
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}
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// NewAuthProxyRoundTripper provides a roundtripper which will add auth proxy fields to requests for
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// authentication terminating proxy cases
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// assuming you pull the user from the context:
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// username is the user.Info.GetName() of the user
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// groups is the user.Info.GetGroups() of the user
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// extra is the user.Info.GetExtra() of the user
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// extra can contain any additional information that the authenticator
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// thought was interesting, for example authorization scopes.
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// In order to faithfully round-trip through an impersonation flow, these keys
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// MUST be lowercase.
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func NewAuthProxyRoundTripper(username string, groups []string, extra map[string][]string, rt http.RoundTripper) http.RoundTripper {
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return &authProxyRoundTripper{
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username: username,
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groups: groups,
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extra: extra,
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rt: rt,
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}
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}
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func (rt *authProxyRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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req = utilnet.CloneRequest(req)
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SetAuthProxyHeaders(req, rt.username, rt.groups, rt.extra)
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return rt.rt.RoundTrip(req)
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}
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// SetAuthProxyHeaders stomps the auth proxy header fields. It mutates its argument.
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func SetAuthProxyHeaders(req *http.Request, username string, groups []string, extra map[string][]string) {
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req.Header.Del("X-Remote-User")
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req.Header.Del("X-Remote-Group")
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for key := range req.Header {
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if strings.HasPrefix(strings.ToLower(key), strings.ToLower("X-Remote-Extra-")) {
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req.Header.Del(key)
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}
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}
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req.Header.Set("X-Remote-User", username)
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for _, group := range groups {
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req.Header.Add("X-Remote-Group", group)
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}
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for key, values := range extra {
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for _, value := range values {
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req.Header.Add("X-Remote-Extra-"+headerKeyEscape(key), value)
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}
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}
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}
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func (rt *authProxyRoundTripper) CancelRequest(req *http.Request) {
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if canceler, ok := rt.rt.(requestCanceler); ok {
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canceler.CancelRequest(req)
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} else {
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klog.Errorf("CancelRequest not implemented by %T", rt.rt)
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}
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}
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func (rt *authProxyRoundTripper) WrappedRoundTripper() http.RoundTripper { return rt.rt }
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type userAgentRoundTripper struct {
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agent string
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rt http.RoundTripper
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}
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func NewUserAgentRoundTripper(agent string, rt http.RoundTripper) http.RoundTripper {
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return &userAgentRoundTripper{agent, rt}
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}
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func (rt *userAgentRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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if len(req.Header.Get("User-Agent")) != 0 {
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return rt.rt.RoundTrip(req)
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}
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req = utilnet.CloneRequest(req)
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req.Header.Set("User-Agent", rt.agent)
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return rt.rt.RoundTrip(req)
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}
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func (rt *userAgentRoundTripper) CancelRequest(req *http.Request) {
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if canceler, ok := rt.rt.(requestCanceler); ok {
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canceler.CancelRequest(req)
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} else {
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klog.Errorf("CancelRequest not implemented by %T", rt.rt)
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}
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}
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func (rt *userAgentRoundTripper) WrappedRoundTripper() http.RoundTripper { return rt.rt }
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type basicAuthRoundTripper struct {
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username string
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password string
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rt http.RoundTripper
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}
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// NewBasicAuthRoundTripper will apply a BASIC auth authorization header to a
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// request unless it has already been set.
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func NewBasicAuthRoundTripper(username, password string, rt http.RoundTripper) http.RoundTripper {
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return &basicAuthRoundTripper{username, password, rt}
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}
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func (rt *basicAuthRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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if len(req.Header.Get("Authorization")) != 0 {
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return rt.rt.RoundTrip(req)
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}
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req = utilnet.CloneRequest(req)
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req.SetBasicAuth(rt.username, rt.password)
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return rt.rt.RoundTrip(req)
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}
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func (rt *basicAuthRoundTripper) CancelRequest(req *http.Request) {
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if canceler, ok := rt.rt.(requestCanceler); ok {
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canceler.CancelRequest(req)
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} else {
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klog.Errorf("CancelRequest not implemented by %T", rt.rt)
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}
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}
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func (rt *basicAuthRoundTripper) WrappedRoundTripper() http.RoundTripper { return rt.rt }
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// These correspond to the headers used in pkg/apis/authentication. We don't want the package dependency,
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// but you must not change the values.
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const (
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// ImpersonateUserHeader is used to impersonate a particular user during an API server request
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ImpersonateUserHeader = "Impersonate-User"
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// ImpersonateGroupHeader is used to impersonate a particular group during an API server request.
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// It can be repeated multiplied times for multiple groups.
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ImpersonateGroupHeader = "Impersonate-Group"
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// ImpersonateUserExtraHeaderPrefix is a prefix for a header used to impersonate an entry in the
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// extra map[string][]string for user.Info. The key for the `extra` map is suffix.
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// The same key can be repeated multiple times to have multiple elements in the slice under a single key.
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// For instance:
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// Impersonate-Extra-Foo: one
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// Impersonate-Extra-Foo: two
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// results in extra["Foo"] = []string{"one", "two"}
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ImpersonateUserExtraHeaderPrefix = "Impersonate-Extra-"
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)
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type impersonatingRoundTripper struct {
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impersonate ImpersonationConfig
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delegate http.RoundTripper
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}
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// NewImpersonatingRoundTripper will add an Act-As header to a request unless it has already been set.
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func NewImpersonatingRoundTripper(impersonate ImpersonationConfig, delegate http.RoundTripper) http.RoundTripper {
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return &impersonatingRoundTripper{impersonate, delegate}
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}
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func (rt *impersonatingRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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// use the user header as marker for the rest.
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if len(req.Header.Get(ImpersonateUserHeader)) != 0 {
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return rt.delegate.RoundTrip(req)
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}
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req = utilnet.CloneRequest(req)
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req.Header.Set(ImpersonateUserHeader, rt.impersonate.UserName)
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for _, group := range rt.impersonate.Groups {
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req.Header.Add(ImpersonateGroupHeader, group)
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}
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for k, vv := range rt.impersonate.Extra {
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for _, v := range vv {
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req.Header.Add(ImpersonateUserExtraHeaderPrefix+headerKeyEscape(k), v)
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}
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}
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return rt.delegate.RoundTrip(req)
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}
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func (rt *impersonatingRoundTripper) CancelRequest(req *http.Request) {
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if canceler, ok := rt.delegate.(requestCanceler); ok {
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canceler.CancelRequest(req)
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} else {
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klog.Errorf("CancelRequest not implemented by %T", rt.delegate)
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}
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}
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func (rt *impersonatingRoundTripper) WrappedRoundTripper() http.RoundTripper { return rt.delegate }
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type bearerAuthRoundTripper struct {
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bearer string
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rt http.RoundTripper
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}
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// NewBearerAuthRoundTripper adds the provided bearer token to a request
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// unless the authorization header has already been set.
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func NewBearerAuthRoundTripper(bearer string, rt http.RoundTripper) http.RoundTripper {
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return &bearerAuthRoundTripper{bearer, rt}
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}
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func (rt *bearerAuthRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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if len(req.Header.Get("Authorization")) != 0 {
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return rt.rt.RoundTrip(req)
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}
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req = utilnet.CloneRequest(req)
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req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", rt.bearer))
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return rt.rt.RoundTrip(req)
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}
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func (rt *bearerAuthRoundTripper) CancelRequest(req *http.Request) {
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if canceler, ok := rt.rt.(requestCanceler); ok {
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canceler.CancelRequest(req)
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} else {
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klog.Errorf("CancelRequest not implemented by %T", rt.rt)
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}
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}
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func (rt *bearerAuthRoundTripper) WrappedRoundTripper() http.RoundTripper { return rt.rt }
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// requestInfo keeps track of information about a request/response combination
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type requestInfo struct {
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RequestHeaders http.Header
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RequestVerb string
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RequestURL string
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ResponseStatus string
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ResponseHeaders http.Header
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ResponseErr error
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Duration time.Duration
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}
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// newRequestInfo creates a new RequestInfo based on an http request
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func newRequestInfo(req *http.Request) *requestInfo {
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return &requestInfo{
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RequestURL: req.URL.String(),
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RequestVerb: req.Method,
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RequestHeaders: req.Header,
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}
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}
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// complete adds information about the response to the requestInfo
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func (r *requestInfo) complete(response *http.Response, err error) {
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if err != nil {
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r.ResponseErr = err
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return
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}
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r.ResponseStatus = response.Status
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r.ResponseHeaders = response.Header
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}
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// toCurl returns a string that can be run as a command in a terminal (minus the body)
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func (r *requestInfo) toCurl() string {
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headers := ""
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for key, values := range r.RequestHeaders {
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for _, value := range values {
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headers += fmt.Sprintf(` -H %q`, fmt.Sprintf("%s: %s", key, value))
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}
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}
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return fmt.Sprintf("curl -k -v -X%s %s '%s'", r.RequestVerb, headers, r.RequestURL)
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}
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// debuggingRoundTripper will display information about the requests passing
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// through it based on what is configured
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type debuggingRoundTripper struct {
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delegatedRoundTripper http.RoundTripper
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levels map[debugLevel]bool
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}
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type debugLevel int
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const (
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debugJustURL debugLevel = iota
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debugURLTiming
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debugCurlCommand
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debugRequestHeaders
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debugResponseStatus
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debugResponseHeaders
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)
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func newDebuggingRoundTripper(rt http.RoundTripper, levels ...debugLevel) *debuggingRoundTripper {
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drt := &debuggingRoundTripper{
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delegatedRoundTripper: rt,
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levels: make(map[debugLevel]bool, len(levels)),
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}
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for _, v := range levels {
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drt.levels[v] = true
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}
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return drt
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}
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func (rt *debuggingRoundTripper) CancelRequest(req *http.Request) {
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if canceler, ok := rt.delegatedRoundTripper.(requestCanceler); ok {
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canceler.CancelRequest(req)
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} else {
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klog.Errorf("CancelRequest not implemented by %T", rt.delegatedRoundTripper)
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}
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}
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func (rt *debuggingRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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reqInfo := newRequestInfo(req)
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if rt.levels[debugJustURL] {
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klog.Infof("%s %s", reqInfo.RequestVerb, reqInfo.RequestURL)
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}
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if rt.levels[debugCurlCommand] {
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klog.Infof("%s", reqInfo.toCurl())
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}
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if rt.levels[debugRequestHeaders] {
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klog.Infof("Request Headers:")
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for key, values := range reqInfo.RequestHeaders {
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for _, value := range values {
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klog.Infof(" %s: %s", key, value)
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}
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}
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}
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startTime := time.Now()
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response, err := rt.delegatedRoundTripper.RoundTrip(req)
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reqInfo.Duration = time.Since(startTime)
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reqInfo.complete(response, err)
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if rt.levels[debugURLTiming] {
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klog.Infof("%s %s %s in %d milliseconds", reqInfo.RequestVerb, reqInfo.RequestURL, reqInfo.ResponseStatus, reqInfo.Duration.Nanoseconds()/int64(time.Millisecond))
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}
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if rt.levels[debugResponseStatus] {
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klog.Infof("Response Status: %s in %d milliseconds", reqInfo.ResponseStatus, reqInfo.Duration.Nanoseconds()/int64(time.Millisecond))
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}
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if rt.levels[debugResponseHeaders] {
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klog.Infof("Response Headers:")
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for key, values := range reqInfo.ResponseHeaders {
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for _, value := range values {
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klog.Infof(" %s: %s", key, value)
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}
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}
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}
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return response, err
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}
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func (rt *debuggingRoundTripper) WrappedRoundTripper() http.RoundTripper {
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return rt.delegatedRoundTripper
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}
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func legalHeaderByte(b byte) bool {
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return int(b) < len(legalHeaderKeyBytes) && legalHeaderKeyBytes[b]
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}
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func shouldEscape(b byte) bool {
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// url.PathUnescape() returns an error if any '%' is not followed by two
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// hexadecimal digits, so we'll intentionally encode it.
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return !legalHeaderByte(b) || b == '%'
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}
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func headerKeyEscape(key string) string {
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buf := strings.Builder{}
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for i := 0; i < len(key); i++ {
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b := key[i]
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if shouldEscape(b) {
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// %-encode bytes that should be escaped:
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// https://tools.ietf.org/html/rfc3986#section-2.1
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fmt.Fprintf(&buf, "%%%02X", b)
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continue
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}
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buf.WriteByte(b)
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}
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return buf.String()
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}
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// legalHeaderKeyBytes was copied from net/http/lex.go's isTokenTable.
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// See https://httpwg.github.io/specs/rfc7230.html#rule.token.separators
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var legalHeaderKeyBytes = [127]bool{
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'%': true,
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'!': true,
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'#': true,
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'$': true,
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'&': true,
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'\'': true,
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'*': true,
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'+': true,
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'-': true,
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'.': true,
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'0': true,
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'1': true,
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'2': true,
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'3': true,
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'4': true,
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'5': true,
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'6': true,
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'7': true,
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'8': true,
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'9': true,
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'A': true,
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'B': true,
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'C': true,
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'D': true,
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'E': true,
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'F': true,
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'G': true,
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'H': true,
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'I': true,
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'J': true,
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'K': true,
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'L': true,
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'M': true,
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'N': true,
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'O': true,
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'P': true,
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'Q': true,
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'R': true,
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'S': true,
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'T': true,
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'U': true,
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'W': true,
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'V': true,
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'X': true,
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'Y': true,
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'Z': true,
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'^': true,
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'_': true,
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'`': true,
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'a': true,
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'b': true,
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'c': true,
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'd': true,
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'e': true,
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'f': true,
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'g': true,
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'h': true,
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'i': true,
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'j': true,
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'k': true,
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'l': true,
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'm': true,
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|
'n': true,
|
|
'o': true,
|
|
'p': true,
|
|
'q': true,
|
|
'r': true,
|
|
's': true,
|
|
't': true,
|
|
'u': true,
|
|
'v': true,
|
|
'w': true,
|
|
'x': true,
|
|
'y': true,
|
|
'z': true,
|
|
'|': true,
|
|
'~': true,
|
|
}
|