90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
// Copyright 2013 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package httputil
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import (
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"net"
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"net/http"
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"net/url"
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"time"
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)
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// NewClient returns a http.Client using the specified http.RoundTripper.
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func NewClient(rt http.RoundTripper) *http.Client {
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return &http.Client{Transport: rt}
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}
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// NewDeadlineClient returns a new http.Client which will time out long running
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// requests.
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func NewDeadlineClient(timeout time.Duration, proxyURL *url.URL) *http.Client {
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return NewClient(NewDeadlineRoundTripper(timeout, proxyURL))
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}
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// NewDeadlineRoundTripper returns a new http.RoundTripper which will time out
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// long running requests.
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func NewDeadlineRoundTripper(timeout time.Duration, proxyURL *url.URL) http.RoundTripper {
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return &http.Transport{
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// Set proxy (if null, then becomes a direct connection)
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Proxy: http.ProxyURL(proxyURL),
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// We need to disable keepalive, because we set a deadline on the
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// underlying connection.
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DisableKeepAlives: true,
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Dial: func(netw, addr string) (c net.Conn, err error) {
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start := time.Now()
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c, err = net.DialTimeout(netw, addr, timeout)
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if err == nil {
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c.SetDeadline(start.Add(timeout))
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}
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return
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},
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}
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}
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type bearerAuthRoundTripper struct {
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bearerToken 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 unless the authorization
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// 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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req = cloneRequest(req)
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req.Header.Set("Authorization", "Bearer "+rt.bearerToken)
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}
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return rt.rt.RoundTrip(req)
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}
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// cloneRequest returns a clone of the provided *http.Request.
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// The clone is a shallow copy of the struct and its Header map.
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func cloneRequest(r *http.Request) *http.Request {
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// Shallow copy of the struct.
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r2 := new(http.Request)
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*r2 = *r
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// Deep copy of the Header.
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r2.Header = make(http.Header)
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for k, s := range r.Header {
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r2.Header[k] = s
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}
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return r2
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}
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