mirror of
https://github.com/k3s-io/k3s.git
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630 lines
20 KiB
Go
630 lines
20 KiB
Go
/*
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Copyright 2016 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 rest
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import (
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"context"
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"errors"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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gruntime "runtime"
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"strings"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/pkg/version"
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clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
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"k8s.io/client-go/transport"
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certutil "k8s.io/client-go/util/cert"
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"k8s.io/client-go/util/flowcontrol"
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"k8s.io/klog/v2"
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)
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const (
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DefaultQPS float32 = 5.0
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DefaultBurst int = 10
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)
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var ErrNotInCluster = errors.New("unable to load in-cluster configuration, KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT must be defined")
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// Config holds the common attributes that can be passed to a Kubernetes client on
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// initialization.
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type Config struct {
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// Host must be a host string, a host:port pair, or a URL to the base of the apiserver.
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// If a URL is given then the (optional) Path of that URL represents a prefix that must
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// be appended to all request URIs used to access the apiserver. This allows a frontend
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// proxy to easily relocate all of the apiserver endpoints.
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Host string
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// APIPath is a sub-path that points to an API root.
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APIPath string
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// ContentConfig contains settings that affect how objects are transformed when
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// sent to the server.
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ContentConfig
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// Server requires Basic authentication
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Username string
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Password string
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// Server requires Bearer authentication. This client will not attempt to use
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// refresh tokens for an OAuth2 flow.
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// TODO: demonstrate an OAuth2 compatible client.
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BearerToken string
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// Path to a file containing a BearerToken.
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// If set, the contents are periodically read.
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// The last successfully read value takes precedence over BearerToken.
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BearerTokenFile string
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// Impersonate is the configuration that RESTClient will use for impersonation.
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Impersonate ImpersonationConfig
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// Server requires plugin-specified authentication.
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AuthProvider *clientcmdapi.AuthProviderConfig
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// Callback to persist config for AuthProvider.
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AuthConfigPersister AuthProviderConfigPersister
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// Exec-based authentication provider.
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ExecProvider *clientcmdapi.ExecConfig
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// TLSClientConfig contains settings to enable transport layer security
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TLSClientConfig
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// UserAgent is an optional field that specifies the caller of this request.
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UserAgent string
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// DisableCompression bypasses automatic GZip compression requests to the
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// server.
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DisableCompression bool
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// Transport may be used for custom HTTP behavior. This attribute may not
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// be specified with the TLS client certificate options. Use WrapTransport
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// to provide additional per-server middleware behavior.
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Transport http.RoundTripper
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// WrapTransport will be invoked for custom HTTP behavior after the underlying
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// transport is initialized (either the transport created from TLSClientConfig,
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// Transport, or http.DefaultTransport). The config may layer other RoundTrippers
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// on top of the returned RoundTripper.
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//
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// A future release will change this field to an array. Use config.Wrap()
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// instead of setting this value directly.
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WrapTransport transport.WrapperFunc
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// QPS indicates the maximum QPS to the master from this client.
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// If it's zero, the created RESTClient will use DefaultQPS: 5
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QPS float32
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// Maximum burst for throttle.
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// If it's zero, the created RESTClient will use DefaultBurst: 10.
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Burst int
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// Rate limiter for limiting connections to the master from this client. If present overwrites QPS/Burst
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RateLimiter flowcontrol.RateLimiter
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// WarningHandler handles warnings in server responses.
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// If not set, the default warning handler is used.
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WarningHandler WarningHandler
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// The maximum length of time to wait before giving up on a server request. A value of zero means no timeout.
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Timeout time.Duration
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// Dial specifies the dial function for creating unencrypted TCP connections.
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Dial func(ctx context.Context, network, address string) (net.Conn, error)
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// Proxy is the the proxy func to be used for all requests made by this
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// transport. If Proxy is nil, http.ProxyFromEnvironment is used. If Proxy
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// returns a nil *URL, no proxy is used.
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//
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// socks5 proxying does not currently support spdy streaming endpoints.
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Proxy func(*http.Request) (*url.URL, error)
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// Version forces a specific version to be used (if registered)
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// Do we need this?
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// Version string
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}
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var _ fmt.Stringer = new(Config)
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var _ fmt.GoStringer = new(Config)
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type sanitizedConfig *Config
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type sanitizedAuthConfigPersister struct{ AuthProviderConfigPersister }
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func (sanitizedAuthConfigPersister) GoString() string {
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return "rest.AuthProviderConfigPersister(--- REDACTED ---)"
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}
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func (sanitizedAuthConfigPersister) String() string {
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return "rest.AuthProviderConfigPersister(--- REDACTED ---)"
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}
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// GoString implements fmt.GoStringer and sanitizes sensitive fields of Config
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// to prevent accidental leaking via logs.
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func (c *Config) GoString() string {
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return c.String()
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}
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// String implements fmt.Stringer and sanitizes sensitive fields of Config to
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// prevent accidental leaking via logs.
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func (c *Config) String() string {
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if c == nil {
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return "<nil>"
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}
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cc := sanitizedConfig(CopyConfig(c))
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// Explicitly mark non-empty credential fields as redacted.
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if cc.Password != "" {
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cc.Password = "--- REDACTED ---"
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}
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if cc.BearerToken != "" {
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cc.BearerToken = "--- REDACTED ---"
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}
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if cc.AuthConfigPersister != nil {
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cc.AuthConfigPersister = sanitizedAuthConfigPersister{cc.AuthConfigPersister}
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}
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return fmt.Sprintf("%#v", cc)
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}
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// ImpersonationConfig has all the available impersonation options
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type ImpersonationConfig struct {
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// UserName is the username to impersonate on each request.
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UserName string
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// Groups are the groups to impersonate on each request.
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Groups []string
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// Extra is a free-form field which can be used to link some authentication information
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// to authorization information. This field allows you to impersonate it.
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Extra map[string][]string
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}
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// +k8s:deepcopy-gen=true
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// TLSClientConfig contains settings to enable transport layer security
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type TLSClientConfig struct {
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// Server should be accessed without verifying the TLS certificate. For testing only.
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Insecure bool
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// ServerName is passed to the server for SNI and is used in the client to check server
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// ceritificates against. If ServerName is empty, the hostname used to contact the
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// server is used.
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ServerName string
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// Server requires TLS client certificate authentication
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CertFile string
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// Server requires TLS client certificate authentication
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KeyFile string
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// Trusted root certificates for server
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CAFile string
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// CertData holds PEM-encoded bytes (typically read from a client certificate file).
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// CertData takes precedence over CertFile
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CertData []byte
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// KeyData holds PEM-encoded bytes (typically read from a client certificate key file).
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// KeyData takes precedence over KeyFile
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KeyData []byte
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// CAData holds PEM-encoded bytes (typically read from a root certificates bundle).
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// CAData takes precedence over CAFile
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CAData []byte
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// NextProtos is a list of supported application level protocols, in order of preference.
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// Used to populate tls.Config.NextProtos.
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// To indicate to the server http/1.1 is preferred over http/2, set to ["http/1.1", "h2"] (though the server is free to ignore that preference).
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// To use only http/1.1, set to ["http/1.1"].
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NextProtos []string
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}
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var _ fmt.Stringer = TLSClientConfig{}
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var _ fmt.GoStringer = TLSClientConfig{}
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type sanitizedTLSClientConfig TLSClientConfig
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// GoString implements fmt.GoStringer and sanitizes sensitive fields of
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// TLSClientConfig to prevent accidental leaking via logs.
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func (c TLSClientConfig) GoString() string {
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return c.String()
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}
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// String implements fmt.Stringer and sanitizes sensitive fields of
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// TLSClientConfig to prevent accidental leaking via logs.
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func (c TLSClientConfig) String() string {
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cc := sanitizedTLSClientConfig{
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Insecure: c.Insecure,
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ServerName: c.ServerName,
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CertFile: c.CertFile,
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KeyFile: c.KeyFile,
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CAFile: c.CAFile,
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CertData: c.CertData,
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KeyData: c.KeyData,
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CAData: c.CAData,
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NextProtos: c.NextProtos,
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}
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// Explicitly mark non-empty credential fields as redacted.
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if len(cc.CertData) != 0 {
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cc.CertData = []byte("--- TRUNCATED ---")
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}
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if len(cc.KeyData) != 0 {
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cc.KeyData = []byte("--- REDACTED ---")
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}
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return fmt.Sprintf("%#v", cc)
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}
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type ContentConfig struct {
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// AcceptContentTypes specifies the types the client will accept and is optional.
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// If not set, ContentType will be used to define the Accept header
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AcceptContentTypes string
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// ContentType specifies the wire format used to communicate with the server.
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// This value will be set as the Accept header on requests made to the server, and
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// as the default content type on any object sent to the server. If not set,
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// "application/json" is used.
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ContentType string
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// GroupVersion is the API version to talk to. Must be provided when initializing
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// a RESTClient directly. When initializing a Client, will be set with the default
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// code version.
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GroupVersion *schema.GroupVersion
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// NegotiatedSerializer is used for obtaining encoders and decoders for multiple
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// supported media types.
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//
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// TODO: NegotiatedSerializer will be phased out as internal clients are removed
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// from Kubernetes.
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NegotiatedSerializer runtime.NegotiatedSerializer
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}
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// RESTClientFor returns a RESTClient that satisfies the requested attributes on a client Config
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// object. Note that a RESTClient may require fields that are optional when initializing a Client.
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// A RESTClient created by this method is generic - it expects to operate on an API that follows
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// the Kubernetes conventions, but may not be the Kubernetes API.
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func RESTClientFor(config *Config) (*RESTClient, error) {
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if config.GroupVersion == nil {
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return nil, fmt.Errorf("GroupVersion is required when initializing a RESTClient")
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}
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if config.NegotiatedSerializer == nil {
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return nil, fmt.Errorf("NegotiatedSerializer is required when initializing a RESTClient")
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}
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baseURL, versionedAPIPath, err := defaultServerUrlFor(config)
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if err != nil {
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return nil, err
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}
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transport, err := TransportFor(config)
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if err != nil {
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return nil, err
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}
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var httpClient *http.Client
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if transport != http.DefaultTransport {
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httpClient = &http.Client{Transport: transport}
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if config.Timeout > 0 {
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httpClient.Timeout = config.Timeout
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}
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}
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rateLimiter := config.RateLimiter
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if rateLimiter == nil {
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qps := config.QPS
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if config.QPS == 0.0 {
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qps = DefaultQPS
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}
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burst := config.Burst
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if config.Burst == 0 {
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burst = DefaultBurst
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}
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if qps > 0 {
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rateLimiter = flowcontrol.NewTokenBucketRateLimiter(qps, burst)
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}
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}
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var gv schema.GroupVersion
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if config.GroupVersion != nil {
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gv = *config.GroupVersion
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}
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clientContent := ClientContentConfig{
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AcceptContentTypes: config.AcceptContentTypes,
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ContentType: config.ContentType,
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GroupVersion: gv,
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Negotiator: runtime.NewClientNegotiator(config.NegotiatedSerializer, gv),
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}
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restClient, err := NewRESTClient(baseURL, versionedAPIPath, clientContent, rateLimiter, httpClient)
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if err == nil && config.WarningHandler != nil {
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restClient.warningHandler = config.WarningHandler
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}
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return restClient, err
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}
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// UnversionedRESTClientFor is the same as RESTClientFor, except that it allows
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// the config.Version to be empty.
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func UnversionedRESTClientFor(config *Config) (*RESTClient, error) {
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if config.NegotiatedSerializer == nil {
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return nil, fmt.Errorf("NegotiatedSerializer is required when initializing a RESTClient")
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}
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baseURL, versionedAPIPath, err := defaultServerUrlFor(config)
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if err != nil {
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return nil, err
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}
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transport, err := TransportFor(config)
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if err != nil {
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return nil, err
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}
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var httpClient *http.Client
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if transport != http.DefaultTransport {
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httpClient = &http.Client{Transport: transport}
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if config.Timeout > 0 {
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httpClient.Timeout = config.Timeout
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}
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}
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rateLimiter := config.RateLimiter
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if rateLimiter == nil {
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qps := config.QPS
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if config.QPS == 0.0 {
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qps = DefaultQPS
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}
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burst := config.Burst
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if config.Burst == 0 {
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burst = DefaultBurst
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}
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if qps > 0 {
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rateLimiter = flowcontrol.NewTokenBucketRateLimiter(qps, burst)
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}
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}
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gv := metav1.SchemeGroupVersion
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if config.GroupVersion != nil {
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gv = *config.GroupVersion
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}
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clientContent := ClientContentConfig{
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AcceptContentTypes: config.AcceptContentTypes,
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ContentType: config.ContentType,
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GroupVersion: gv,
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Negotiator: runtime.NewClientNegotiator(config.NegotiatedSerializer, gv),
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}
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restClient, err := NewRESTClient(baseURL, versionedAPIPath, clientContent, rateLimiter, httpClient)
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if err == nil && config.WarningHandler != nil {
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restClient.warningHandler = config.WarningHandler
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}
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return restClient, err
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}
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// SetKubernetesDefaults sets default values on the provided client config for accessing the
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// Kubernetes API or returns an error if any of the defaults are impossible or invalid.
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func SetKubernetesDefaults(config *Config) error {
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if len(config.UserAgent) == 0 {
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config.UserAgent = DefaultKubernetesUserAgent()
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}
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return nil
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}
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// adjustCommit returns sufficient significant figures of the commit's git hash.
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func adjustCommit(c string) string {
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if len(c) == 0 {
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return "unknown"
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}
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if len(c) > 7 {
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return c[:7]
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}
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return c
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}
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// adjustVersion strips "alpha", "beta", etc. from version in form
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// major.minor.patch-[alpha|beta|etc].
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func adjustVersion(v string) string {
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if len(v) == 0 {
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return "unknown"
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}
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seg := strings.SplitN(v, "-", 2)
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return seg[0]
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}
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// adjustCommand returns the last component of the
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// OS-specific command path for use in User-Agent.
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func adjustCommand(p string) string {
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// Unlikely, but better than returning "".
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if len(p) == 0 {
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return "unknown"
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}
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return filepath.Base(p)
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}
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// buildUserAgent builds a User-Agent string from given args.
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func buildUserAgent(command, version, os, arch, commit string) string {
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return fmt.Sprintf(
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"%s/%s (%s/%s) kubernetes/%s", command, version, os, arch, commit)
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}
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// DefaultKubernetesUserAgent returns a User-Agent string built from static global vars.
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func DefaultKubernetesUserAgent() string {
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return buildUserAgent(
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adjustCommand(os.Args[0]),
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adjustVersion(version.Get().GitVersion),
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gruntime.GOOS,
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gruntime.GOARCH,
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adjustCommit(version.Get().GitCommit))
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}
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// InClusterConfig returns a config object which uses the service account
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// kubernetes gives to pods. It's intended for clients that expect to be
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// running inside a pod running on kubernetes. It will return ErrNotInCluster
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// if called from a process not running in a kubernetes environment.
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func InClusterConfig() (*Config, error) {
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const (
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tokenFile = "/var/run/secrets/kubernetes.io/serviceaccount/token"
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rootCAFile = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
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)
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host, port := os.Getenv("KUBERNETES_SERVICE_HOST"), os.Getenv("KUBERNETES_SERVICE_PORT")
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if len(host) == 0 || len(port) == 0 {
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return nil, ErrNotInCluster
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}
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token, err := ioutil.ReadFile(tokenFile)
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if err != nil {
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return nil, err
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}
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tlsClientConfig := TLSClientConfig{}
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if _, err := certutil.NewPool(rootCAFile); err != nil {
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klog.Errorf("Expected to load root CA config from %s, but got err: %v", rootCAFile, err)
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} else {
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tlsClientConfig.CAFile = rootCAFile
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}
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return &Config{
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// TODO: switch to using cluster DNS.
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Host: "https://" + net.JoinHostPort(host, port),
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TLSClientConfig: tlsClientConfig,
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BearerToken: string(token),
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BearerTokenFile: tokenFile,
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}, nil
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}
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// IsConfigTransportTLS returns true if and only if the provided
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// config will result in a protected connection to the server when it
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// is passed to restclient.RESTClientFor(). Use to determine when to
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// send credentials over the wire.
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//
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// Note: the Insecure flag is ignored when testing for this value, so MITM attacks are
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// still possible.
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func IsConfigTransportTLS(config Config) bool {
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baseURL, _, err := defaultServerUrlFor(&config)
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if err != nil {
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return false
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}
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return baseURL.Scheme == "https"
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}
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// LoadTLSFiles copies the data from the CertFile, KeyFile, and CAFile fields into the CertData,
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// KeyData, and CAFile fields, or returns an error. If no error is returned, all three fields are
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// either populated or were empty to start.
|
|
func LoadTLSFiles(c *Config) error {
|
|
var err error
|
|
c.CAData, err = dataFromSliceOrFile(c.CAData, c.CAFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
c.CertData, err = dataFromSliceOrFile(c.CertData, c.CertFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
c.KeyData, err = dataFromSliceOrFile(c.KeyData, c.KeyFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// dataFromSliceOrFile returns data from the slice (if non-empty), or from the file,
|
|
// or an error if an error occurred reading the file
|
|
func dataFromSliceOrFile(data []byte, file string) ([]byte, error) {
|
|
if len(data) > 0 {
|
|
return data, nil
|
|
}
|
|
if len(file) > 0 {
|
|
fileData, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
return []byte{}, err
|
|
}
|
|
return fileData, nil
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
func AddUserAgent(config *Config, userAgent string) *Config {
|
|
fullUserAgent := DefaultKubernetesUserAgent() + "/" + userAgent
|
|
config.UserAgent = fullUserAgent
|
|
return config
|
|
}
|
|
|
|
// AnonymousClientConfig returns a copy of the given config with all user credentials (cert/key, bearer token, and username/password) and custom transports (WrapTransport, Transport) removed
|
|
func AnonymousClientConfig(config *Config) *Config {
|
|
// copy only known safe fields
|
|
return &Config{
|
|
Host: config.Host,
|
|
APIPath: config.APIPath,
|
|
ContentConfig: config.ContentConfig,
|
|
TLSClientConfig: TLSClientConfig{
|
|
Insecure: config.Insecure,
|
|
ServerName: config.ServerName,
|
|
CAFile: config.TLSClientConfig.CAFile,
|
|
CAData: config.TLSClientConfig.CAData,
|
|
NextProtos: config.TLSClientConfig.NextProtos,
|
|
},
|
|
RateLimiter: config.RateLimiter,
|
|
WarningHandler: config.WarningHandler,
|
|
UserAgent: config.UserAgent,
|
|
DisableCompression: config.DisableCompression,
|
|
QPS: config.QPS,
|
|
Burst: config.Burst,
|
|
Timeout: config.Timeout,
|
|
Dial: config.Dial,
|
|
Proxy: config.Proxy,
|
|
}
|
|
}
|
|
|
|
// CopyConfig returns a copy of the given config
|
|
func CopyConfig(config *Config) *Config {
|
|
return &Config{
|
|
Host: config.Host,
|
|
APIPath: config.APIPath,
|
|
ContentConfig: config.ContentConfig,
|
|
Username: config.Username,
|
|
Password: config.Password,
|
|
BearerToken: config.BearerToken,
|
|
BearerTokenFile: config.BearerTokenFile,
|
|
Impersonate: ImpersonationConfig{
|
|
Groups: config.Impersonate.Groups,
|
|
Extra: config.Impersonate.Extra,
|
|
UserName: config.Impersonate.UserName,
|
|
},
|
|
AuthProvider: config.AuthProvider,
|
|
AuthConfigPersister: config.AuthConfigPersister,
|
|
ExecProvider: config.ExecProvider,
|
|
TLSClientConfig: TLSClientConfig{
|
|
Insecure: config.TLSClientConfig.Insecure,
|
|
ServerName: config.TLSClientConfig.ServerName,
|
|
CertFile: config.TLSClientConfig.CertFile,
|
|
KeyFile: config.TLSClientConfig.KeyFile,
|
|
CAFile: config.TLSClientConfig.CAFile,
|
|
CertData: config.TLSClientConfig.CertData,
|
|
KeyData: config.TLSClientConfig.KeyData,
|
|
CAData: config.TLSClientConfig.CAData,
|
|
NextProtos: config.TLSClientConfig.NextProtos,
|
|
},
|
|
UserAgent: config.UserAgent,
|
|
DisableCompression: config.DisableCompression,
|
|
Transport: config.Transport,
|
|
WrapTransport: config.WrapTransport,
|
|
QPS: config.QPS,
|
|
Burst: config.Burst,
|
|
RateLimiter: config.RateLimiter,
|
|
WarningHandler: config.WarningHandler,
|
|
Timeout: config.Timeout,
|
|
Dial: config.Dial,
|
|
Proxy: config.Proxy,
|
|
}
|
|
}
|