112c7b2e9e
This code existed in cert-manager once before and I'm reviving it. Here's the history: * Added: https://github.com/cert-manager/cert-manager/pull/422 * Moved: https://github.com/cert-manager/cert-manager/pull/432 * Obsoleted: https://github.com/cert-manager/cert-manager/pull/797 * Deleted: https://github.com/cert-manager/cert-manager/pull/966 Signed-off-by: Richard Wall <richard.wall@venafi.com>
84 lines
2.6 KiB
Go
84 lines
2.6 KiB
Go
/*
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Copyright 2020 The cert-manager 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 util
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import (
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"bytes"
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"fmt"
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"net/http"
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"strings"
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"unicode"
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"unicode/utf8"
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"k8s.io/apimachinery/pkg/apis/meta/v1/validation"
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"k8s.io/client-go/rest"
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)
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// RestConfigWithUserAgent returns a copy of the Kubernetes REST config with
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// the User Agent set which includes the optional component strings given.
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func RestConfigWithUserAgent(restConfig *rest.Config, component ...string) *rest.Config {
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restConfig = rest.CopyConfig(restConfig)
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restConfig.UserAgent = fmt.Sprintf("%s/%s (%s) cert-manager/%s",
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strings.Join(append([]string{"cert-manager"}, component...), "-"),
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version(), VersionInfo().Platform, VersionInfo().GitCommit)
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return restConfig
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}
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// PrefixFromUserAgent takes the characters preceding the first /, quote
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// unprintable character and then trim what's beyond the FieldManagerMaxLength
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// limit.
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// Taken from
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// https://github.com/kubernetes/kubernetes/blob/9a75e7b0fd1b567f774a3373be640e19b33e7ef1/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/create.go#L252
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func PrefixFromUserAgent(u string) string {
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m := strings.Split(u, "/")[0]
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buf := bytes.NewBuffer(nil)
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for _, r := range m {
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// Ignore non-printable characters
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if !unicode.IsPrint(r) {
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continue
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}
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// Only append if we have room for it
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if buf.Len()+utf8.RuneLen(r) > validation.FieldManagerMaxLength {
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break
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}
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buf.WriteRune(r)
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}
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return buf.String()
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}
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// UserAgentRoundTripper implements the http.RoundTripper interface and adds a User-Agent
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// header.
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type userAgentRoundTripper struct {
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inner http.RoundTripper
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userAgent string
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}
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// UserAgentRoundTripper returns a RoundTripper that functions identically to
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// the provided 'inner' round tripper, other than also setting a user agent.
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func UserAgentRoundTripper(inner http.RoundTripper, userAgent string) http.RoundTripper {
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return userAgentRoundTripper{
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inner: inner,
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userAgent: userAgent,
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}
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}
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// RoundTrip implements http.RoundTripper
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func (u userAgentRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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req.Header.Set("User-Agent", u.userAgent)
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return u.inner.RoundTrip(req)
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}
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