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105 lines
2.7 KiB
105 lines
2.7 KiB
// Copyright 2017 clair authors
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//
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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 implements common HTTP functionality used throughout the Clair codebase.
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package httputil
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import (
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"context"
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"crypto/tls"
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"fmt"
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"io"
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"net"
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"net/http"
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"strings"
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"github.com/coreos/clair/pkg/version"
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)
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// Middleware is a function used to wrap the logic of another http.Handler.
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type Middleware func(http.Handler) http.Handler
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// GetWithUserAgent performs an HTTP GET with the proper Clair User-Agent.
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func GetWithUserAgent(url string) (*http.Response, error) {
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client := &http.Client{}
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req, err := http.NewRequest("GET", url, nil)
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if err != nil {
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return nil, err
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}
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req.Header.Set("User-Agent", "Clair/"+version.Version+" (https://github.com/coreos/clair)")
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resp, err := client.Do(req)
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if err != nil {
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return nil, err
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}
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return resp, nil
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}
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// GetClientAddr returns the first value in X-Forwarded-For if it exists
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// otherwise fall back to use RemoteAddr
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func GetClientAddr(r *http.Request) string {
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addr := r.RemoteAddr
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if s := r.Header.Get("X-Forwarded-For"); s != "" {
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ips := strings.Split(s, ",")
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// assume the first one is the client address
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if len(ips) != 0 {
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// validate the ip
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if realIP := net.ParseIP(ips[0]); realIP != nil {
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addr = strings.TrimSpace(ips[0])
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}
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}
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}
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return addr
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}
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// GetWithContext do HTTP GET to the URI with headers and returns response blob
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// reader.
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func GetWithContext(ctx context.Context, uri string, headers http.Header) (io.ReadCloser, error) {
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request, err := http.NewRequest("GET", uri, nil)
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if err != nil {
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return nil, err
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}
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if headers != nil {
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request.Header = headers
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}
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tr := &http.Transport{
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TLSClientConfig: &tls.Config{},
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Proxy: http.ProxyFromEnvironment,
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}
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client := &http.Client{Transport: tr}
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request = request.WithContext(ctx)
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r, err := client.Do(request)
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if err != nil {
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return nil, err
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}
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// Fail if we don't receive a 2xx HTTP status code.
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if !Status2xx(r) {
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return nil, fmt.Errorf("failed HTTP GET: expected 2XX, got %d", r.StatusCode)
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}
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return r.Body, nil
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}
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// Status2xx returns true if the response's status code is success (2xx)
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func Status2xx(resp *http.Response) bool {
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return resp.StatusCode/100 == 2
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}
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